JP6394008B2 - Electronic clock and date data correction method - Google Patents

Description

  The present invention relates to an electronic timepiece having a function of correcting a date and time by receiving radio waves from a positioning satellite and a date and time data correcting method.

  2. Description of the Related Art Conventionally, an electronic timepiece having a function of receiving time transmission information from a positioning satellite, which is a space segment of a positioning system such as a GPS (Global Positioning System), obtaining date / time information, and correcting time measurement data based on the obtained date / time information. There is. In the correction of time measurement data using the transmission radio wave of the positioning satellite, the date and time can be acquired with very high accuracy by acquiring the date information and position (orbit) information from a plurality of positioning satellites.

  The transmission data from the GPS positioning satellite (hereinafter referred to as GPS satellite) is composed of five sub-frame data (6 seconds) and a total of 30 seconds of frame data. Among them, the date and time information included in each frame indicates HOW (Hand Over Word) including data (TOW-Count) indicating elapsed time in one week and which week the corresponding week is. Data (WN, Week Number). Of these, HOW is included in all subframes, whereas WN is included in only one subframe in one frame. Therefore, in order to acquire complete date and time data, there is a problem that power consumption increases because it is necessary to receive data of 30 seconds per frame at the maximum.

  Therefore, conventionally, date information or further time information corresponding to WN data is set in advance, one subframe data is received and the date and time is acquired based only on HOW, thereby shortening the reception time. There is a technology that corrects time data accurately while reducing the power consumption associated with.

  In addition, as an invention related to the present application, in the reproduction authentication of time-limited content, when the current time is not corrected for a predetermined time or more as a countermeasure against fraud due to falsification of time information, or the time is manually corrected. In such a case, there is a technique for automatically correcting the time by acquiring time information from a GPS satellite or time information of a standard radio wave transmitting time information in a long wavelength band.

JP 2005-251248 A

  However, when the date and time information is acquired from the positioning satellite in a short time and corrected, the information that guarantees the accuracy of the acquired date and time information is deleted from the received data, so that the reliability decreases. There are challenges. In addition, depending on the accuracy of the date and time set in advance, there is a problem that when the date and time are corrected using the setting, the deviation may be increased or the date and time may be erroneously corrected.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic timepiece and a date / time data correction method capable of obtaining an accurate date and time more reliably while suppressing an increase in power consumption.

In order to achieve the above object, the present invention
A time counting means for counting the date and time;
Satellite radio wave receiving means for receiving radio signals from positioning satellites;
A reception period control means for controlling a reception period by the satellite radio wave reception means;
Satellite date and time acquisition means for acquiring date and time information based on the radio wave signal received by the satellite radio wave reception means;
An external communication means for communicating with the outside;
External date and time acquisition means for acquiring date and time information from outside by the external communication means;
Correction means for correcting the date and time counted by the time measuring means using the acquired date and time information;
With
The satellite time acquisition unit, an elapsed time from being performed the previous corrected by the correcting means, is determined according to the correction method of the previous time, the first following criteria hour according to the selection of the method for obtaining the day-time information In this case, the reading period according to the elapsed time and the acquisition method to be selected is determined, and the date and time within the reading period is acquired based on the content received by the satellite radio wave reception means,
The reception period control means sets the reception period as a period during which the satellite date and time acquisition means acquires a part of data capable of identifying the current date and time among a series of data transmitted from the positioning satellite. An electronic timepiece characterized by operating a satellite radio wave receiving means.

  According to the present invention, there is an effect that time can be measured by more accurately acquiring the accurate date and time while suppressing an increase in power consumption.

It is a block diagram which shows the internal structure of the electronic timepiece of 1st Embodiment of this invention. It is a figure explaining the transmission message format of a GPS satellite. It is a figure explaining the status information which shows the latest date correction. It is a flowchart which shows the control procedure of a date correction process. It is a flowchart which shows the control procedure of a standard radio wave date correction process. It is a flowchart which shows the control procedure of a GPS date correction process. It is a flowchart which shows the control procedure of the status setting process of 2nd Embodiment. It is a flowchart which shows the control procedure of the standard radio wave date correction process of 2nd Embodiment. It is a flowchart which shows the control procedure of the GPS date correction process of 2nd Embodiment. It is a flowchart which shows the control procedure of the status setting process of 3rd Embodiment. It is a flowchart which shows the control procedure of the GPS date correction process of 3rd Embodiment. It is a flowchart which shows the control procedure of the GPS date correction process of 4th Embodiment. It is a flowchart which shows the control procedure of the GPS date correction process of 5th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
First, the electronic timepiece 1 of the first embodiment will be described.
FIG. 1 is a block diagram showing the internal configuration of the electronic timepiece 1 of the first embodiment.

  This electronic timepiece 1 includes a CPU (Central Processing Unit) 41 (satellite date / time acquisition means, correction means, manual date / time acquisition means, alignment determination means, external date / time acquisition means, deviation calculation means), and ROM (Read Only Memory) 42 ( (Overlap period storage means), RAM (Random Access Memory) 43, oscillation circuit 44, frequency divider circuit 45, timer circuit 46 (timer means), operation unit 47 (operation means), display unit 48 and display A driver 49, a GPS reception processing unit 50 and its antenna 51, a long wave reception unit 52 and its antenna 53, a power supply unit 54, and the like are provided.

  The CPU 41 performs various arithmetic processes and controls the overall operation of the electronic timepiece 1. The CPU 41 reads out the current date / time data of the timing circuit 46 and displays it on the display unit 48, and operates the GPS reception processing unit 50 and the long wave reception unit 52 based on the program 42a to acquire accurate date / time data, The date and time counted by the timer circuit 46 is corrected.

The ROM 42 stores and stores various control programs and initial setting data. The programs stored in the ROM 42 include a program 42a related to a process for correcting the current date and time counted by the timer circuit 46. Further, the ROM 42 stores in advance a period in which the same code array as the preamble described later appears in the date / time data in the received signal from the GPS satellite. This period data is read from the program 42a as table data and used. Alternatively, this period data may be integrally stored in the program 42a.
The RAM 43 provides a work memory space to the CPU 41 and stores work data and various setting data. The RAM 43 includes a correction history storage unit 43a (reading period setting storage means), and stores information related to the latest date / time correction history. The correction history storage unit 43a of the present embodiment stores a status b indicating the latest date and time correction status.

The oscillation circuit 44 generates and outputs a predetermined frequency signal. The oscillation circuit 44 includes, for example, a crystal oscillator.
The frequency dividing circuit 45 divides the predetermined frequency signal input from the oscillation circuit 44 into signals of each frequency used by the CPU 41 and the time measuring circuit 46, and outputs the signals.

The timer circuit 46 counts the current date and time (date and time). The timer circuit 46 is a counter that holds the current date and time data by counting the clock signal input from the frequency dividing circuit 45 and adding it to the initial date and time value. The initial value of the time measuring circuit 46 is set by referring to an unillustrated RTC (Real Time Clock) when the power is turned on, and is overwritten and corrected by the CPU 41 in accordance with the execution of the program 42a related to date and time correction.
The date and time counted by the timing circuit 46 includes a timing error (rate) according to the frequency error of the frequency signal generated by the crystal oscillator of the oscillation circuit 44. The clocking error of the crystal oscillator of the oscillation circuit 44 used in the normal electronic timepiece 1 is, for example, about 15 seconds per month, and can be measured and acquired in advance and set in the ROM 42 or the like. By multiplying the elapsed time since the previous correction of date and time by this timing error, it is possible to estimate the time difference that the date and time counted by the timing circuit 46 deviates from the accurate date and time.

  The operation unit 47 accepts a user input operation and outputs an electrical signal to the CPU 41 as an input signal. The operation unit 47 includes one or a plurality of push button switches, crowns, touch sensors, and the like, and various predetermined operations such as pressing, rotation, and contact are detected, and an electric signal corresponding to the operation content is received. Generated.

Although not particularly limited, the display unit 48 includes a digital display screen, and displays various functions that can be executed by the electronic timepiece 1 in addition to the current time. For example, a liquid crystal display (LCD) is used as the display screen, and a liquid crystal driver that drives the LCD is used as the display driver 49. The display driver 49 outputs an LCD drive signal to the LCD based on the control signal input from the CPU 41. Alternatively, the display unit 48 includes one or a plurality of hands in addition to or in place of the digital display screen, and the hands are rotated by the rotation of the stepping motor driven by the drive circuit, so that a part of the date and time or the status is displayed. A configuration capable of analog display of the whole may be used.
The display unit 48 and the display driver 49 constitute notification means.

The GPS reception processing unit 50 receives radio waves from one or a plurality of positioning satellites, here GPS satellites, using the antenna 51, and acquires date and time information. Here, the date and time information is a value corresponding to the date and time counted by the internal clock of the GPS satellite, and the time is measured by converting the value based on information such as the time zone of the electronic clock 1 and a delay time described later. The time is counted by the circuit 46. The GPS reception processing unit 50 searches for a receivable one from a plurality of GPS satellites, tunes to the reception frequency of the GPS satellite, and identifies a C / A code for decoding. In addition, the GPS reception processing unit 50 demodulates and decodes the received radio wave from the GPS satellite to acquire date / time data, and outputs it to the CPU 41 in a set format.
At this time, the GPS reception processing unit 50 does not receive all the data (a series of data) for one frame, so that the current date / time data set and input in advance even if the complete date / time data is not acquired from the received radio wave. It is possible to output date / time data on the assumption that the date / time is within the range (reading period) defined for If no WN data is acquired without this setting input, only the time data can be output with the date blank.

The GPS reception processing unit 50 can calculate and output not only the date but also the position of the electronic timepiece 1 when all necessary data is acquired from a plurality of GPS satellites.
These GPS reception processing unit 50 and antenna 51 constitute a satellite radio wave receiving means.

The long wave receiving unit 52 uses the antenna 53 to receive in synchronization with the time information radio wave (standard radio wave) transmitted in the long wavelength band, and outputs the demodulated signal to the CPU 41. The demodulated signal is decoded by the CPU 41 to obtain date / time information. In addition, the structure which the long wave receiving part 52 also performs a decoding process collectively and the acquired time information is output to CPU41 may be sufficient. Further, the long wave receiving unit 52 may further include a configuration related to various noise reduction processes.
These long wave receiving unit 52 and antenna 53 constitute an external communication means.
The GPS reception processing unit 50 and the long wave receiving unit 52 can perform switch control related to on / off of power supply separately from other control units.

  The power supply unit 54 supplies power to each unit of the electronic timepiece 1. The power supply unit 54 includes, for example, a battery such as a button-type or disk-shaped primary battery, and the primary battery can be attached and detached as necessary.

Next, the operation of date correction in the electronic timepiece 1 of the present embodiment will be described.
FIG. 2 is a diagram for explaining a format of a transmission radio wave from a GPS satellite.

  A GPS satellite modulates the phase of a code data array (navigation message data) with a unique C / A code for each satellite and transmits the data at 50 bps. This navigation message data is transmitted in units of frame data (1500 bits) including five 300-bit length (6 seconds) subframes. All data is composed of 25 frames (pages), and it takes 12.5 minutes to acquire all of them.

  In each frame, subframes 1 to 3 include date and time information, status information, and orbit information (ephemeris data) of the GPS satellite for each subframe. In subframes 4 and 5, predicted orbit information (almanac data) regarding all GPS satellites is divided into 25 frames and transmitted.

Each subframe is 30 bits long (0.6 seconds), that is, 10 words (WORD) composed of 30 binary code arrays. Of these, the first WORD1 includes a 22-bit TLM (telemetry word), and this TLM starts with a preamble (preamble) having a fixed 8-bit code array “10001011”. WORD2 includes a 22-bit HOW (Hand Over Word). This HOW includes 17 bits of TOW-Count indicating the time of the week starting from 0:00 on Sunday. This TOW-Count (also referred to as Z count) is a value that increases by 1 every subframe (6 seconds) within the week, and the maximum value is a value of 23:59:54 on Saturday “11000100110111111 "(10079 in decimal).
At the beginning of WORD3 in subframe 1, a week number WN based on January 6, 1980 is transmitted in 10 bits (maximum 1023 in decimal). Further, 6-bit parity information is included at the end of each word, and it can be determined whether or not the demodulation of the word has been accurately performed based on the parity information.

  Here, when it is assumed that the date and time data held by the timing circuit 46 is not shifted by a day unit or more, it is not necessary to acquire the WN. Therefore, TLM and HOW data are received by acquiring data of any subframe. At this time, the position of each word in the subframe is more accurately identified by detecting the preamble twice at intervals of 6 seconds between the heads of adjacent subframes. Accordingly, the time required to receive the preamble twice and acquire the time information is about 7 to 12 seconds.

  If the detection of the second preamble is omitted, the GPS reception processing unit 50 receives WORD1, identifies the position of the word only with one preamble, and terminates the reception when the date / time is decoded with the data of WORD2. You can also When the date and time data held by the clock circuit 46 is not shifted by several seconds or more, the reception of the radio wave from the GPS satellite is started in accordance with the timing, so that the length of 2 to 3 words, that is, 1 Necessary time information can be acquired with a reception time of about 2 seconds. However, in this case, if the same code sequence as the preamble is present in the signal from the GPS satellite, each word position may be erroneously identified. In this case, since the parity check is performed only about three times, an identification error may not be detected.

  Further, for example, when it is assumed that the date and time data held by the time counting circuit 46 has a deviation of less than 3 seconds (a predetermined deviation amount that can identify the date and time of the synchronization point), the preamble is detected. By acquiring only the timing of synchronization every 6 seconds (for example, the head of this preamble is set as the synchronization point), for example, a total of 4 seconds of ± 2 seconds is obtained for the date and time counted by 46 of the clock circuit. As the reading period, the date / time data of the timing circuit 46 can be corrected at the date / time within the reading period. In this case, the current date and time is identified with a length of about one word, that is, a reception time of less than one second, by receiving radio waves from the GPS satellites at the same timing. Corrections are made. However, the possibility of misidentification of the word position is further increased as compared with reception of three words.

  Note that when date / time data is acquired using only the radio waves transmitted from one GPS satellite, it is impossible to determine the exact distance between the GPS satellite and the reception point, so propagation of about 60 ms to 85 ms is possible. The delay due to time cannot be estimated accurately. Therefore, the current date / time data may be acquired with a deviation within about 15 ms by, for example, about 70 ms of advance from the acquired date / time. As a result, it is possible to obtain substantially accurate date and time information within a small error range that does not cause a practical problem of the timepiece without extending the reception time, that is, without increasing power consumption.

  In addition, special information such as leap second information, daylight saving time implementation information, and time zone information needs to be stored separately.

  As described above, when date / time information is acquired by short-time radio wave reception without receiving the entire frame data, the extent to which the date / time data of the clock circuit 46 can be used depends on the magnitude of the date / time deviation. Therefore, in the electronic timepiece 1, the method for receiving and acquiring the date / time information is changed according to the estimated value of the magnitude of the deviation.

FIG. 3 is a chart for explaining status information indicating correction of the latest date and time.
In the electronic timepiece 1 according to the present embodiment, the correction history storage unit 43a stores the 4-bit status b based on the four flags b [0] to b [3], so that the most recent date / time correction timing (previous correction is performed). Elapsed time since then) and type (date information acquisition method) can be easily acquired.

  The flag b [0] of the least significant bit of status b indicates whether or not the most recent date / time correction is due to radio wave reception from a GPS satellite. When the flag b [0] is “1”, it indicates that the date / time has been corrected by receiving a radio wave from a GPS satellite within one month (first reference time), and the flag b [0] is “0”. "" Indicates that the most recent date / time correction is not due to radio wave reception from a GPS satellite, or that the date / time correction has not been performed within one month.

  Similarly, the second digit flag b [1] indicates whether or not the most recent date and time correction is due to reception of a standard radio wave. When the flag b [1] is “1”, it indicates that the date and time have been corrected by receiving the standard radio wave within one month, and when the flag b [1] is “0”, the latest This indicates that the date / time correction is not based on reception of the standard radio wave, or that the date / time correction has not been performed within one month.

The third digit flag b [2] indicates whether or not the most recent date / time correction is due to a user's manual input operation. When the flag b [2] is “1”, it indicates that the date / time has been corrected by manual input operation within one month, and when the flag b [2] is “0”, the most recent date / time is displayed. This indicates that the correction is not due to a manual input operation, or that the date / time has not been corrected within one month.
It should be noted that the one month, which is the expiration date of correction in the flags b [0] to b [2], can be changed as appropriate for each correction method. For example, different settings may be used such that only date correction by manual input operation is within 7 days. Further, in the case of the electronic timepiece 1 having a small error (rate) of the clock circuit 46, no problem occurs even if the expiration date is set longer.

  When the flag b [3] of the most significant bit is “1” in any of the flags b [0] to b [2], the date / time correction related to the flag “1” is within one day. Indicates whether it was done. When the flag b [3] is “0”, it indicates that the date / time correction is performed within one day, and when the flag b [3] is “1”, the date / time correction is one day. Indicates that it was done within one month. Note that the reference period for switching the flag b [3] may be different from one day. For example, considering that the date correction operation is repeatedly performed once a day, it may be within 23 hours 50 minutes instead of within one day.

  In the electronic timepiece 1 of the present embodiment, the counter is operated from the timing when “1” is set in each of the flags b [0] to b [2], and b [3] is changed to “1” one day later. Further, the flag b [0] to b [2] and b [3] are collectively set back to “0” after one month. The counter in this case may be of a software type by counting a predetermined frequency signal from the frequency dividing circuit 45 by the CPU 41.

  FIG. 4 is a flowchart showing a control procedure by the CPU 41 of the date correction process executed in the electronic timepiece 1 of the present embodiment. This date and time correction process is automatically executed once a day at a predetermined time, and is activated and executed in response to an input operation of an execution command by the user.

  When the date correction process is called, the CPU 41 first executes the standard radio wave date correction process (step S102). Thereafter, the CPU 41 executes a GPS date correction process (step S104). Then, the CPU 41 ends the date correction process.

  FIG. 5 is a flowchart showing a control procedure by the CPU 41 of the standard radio wave date correction process called in the date correction process.

  When the standard radio wave date and time correction process is called, the CPU 41 turns on the long wave receiving unit 52 (step S201) and performs a process related to the activation operation of the long wave receiving unit 52 (step S202). The CPU 41 causes the long wave reception unit 52 to receive a standard radio wave from a desired standard radio wave transmission station and demodulates the signal. CPU41 decodes the demodulated signal according to the transmission format of the received standard radio station, and acquires date information (step S203).

  The CPU 41 determines whether or not the reception of the standard radio wave and the acquisition of date / time information have been successful (step S204). If it is determined that the process has not been successful (“NO” in step S204), the CPU 41 ends the standard radio wave date correction process and returns to the date correction process.

  When it is determined that the reception of the standard radio wave and the acquisition of the date / time information are successful (“YES” in step S204), the CPU 41 reads the status b from the correction history storage unit 43a (step S205). The CPU 41 determines whether or not the lower 3 bits (b [2: 0]) of the acquired status b is “001” or “010” (step S206). If it is determined that the result is none (“NO” in step S206), the process of the CPU 41 proceeds to step S208.

  When it is determined that the lower 3 bits of the status b are “001” or “010” (“YES” in step S206), the CPU 41 counts the date and time acquired from the standard radio wave and the time counting circuit 46. It is determined whether or not the difference between the date and time is within 15 seconds (step S207). If it is determined that it is not within 15 seconds (“NO” in step S207), the CPU 41 ends the standard radio wave date correction process as it is and returns to the date correction process. If it is determined that it is within 15 seconds, the process of the CPU 41 proceeds to step S208.

  When the process proceeds to step S208, the CPU 41 overwrites and corrects the date / time data counted by the timing circuit 46 based on the acquisition date / time (step S208). The CPU 41 overwrites and updates the status b [3: 0] to “0010” and starts counting the counter related to the status (step S209). Then, the CPU 41 ends the standard radio wave date correction process and returns to the date correction process.

  FIG. 6 is a flowchart showing a control procedure by the CPU 41 of the GPS date correction process called in the date correction process.

  When the GPS date / time correction process is activated, the CPU 41 reads the status b from the correction history storage unit 43a (step S401). The CPU 41 determines whether the status b is “0001” or “0010” (step S402). If it is determined that the status b is any ("YES" in step S402), there is no need to correct the date and time again, and the CPU 41 ends the GPS date and time correction process and returns to the date and time correction process.

When it is determined that the status b is neither “0001” nor “0010” (“NO” in step S402), the CPU 41 turns on the power of the GPS reception processing unit 50 (step S403), and GPS The activation processing of the reception processing unit 50 is performed (step S404).
If “NO” is branched in step S402, the process does not immediately shift to step S403, and it is determined that the preset start condition of the GPS reception process, for example, the electronic timepiece 1 is outdoors or near a window. In order to do so, the optical sensor may wait until a condition that a predetermined amount of light is detected is satisfied. Further, the CPU 41 searches for the reception frequency and C / A code executed in the activation process of step S403 and performs the processes of steps S405 and S406 in parallel with the process of tuning to the transmission radio wave of any GPS satellite. Is possible.

  The CPU 41 determines whether the status b is “1001” or “1010” (step S405). If it is determined that it is any (“YES” in step S405), the CPU 41 transmits the current date and time counted by the timer circuit 46 to the GPS reception processing unit 50 (step S406). Then, the process of the CPU 41 proceeds to step S407. If it is determined that the status b is neither “1001” nor “1010” (“NO” in step S405), the processing of the CPU 41 proceeds to step S407 as it is.

  The CPU 41 causes the GPS reception processing unit 50 to perform reception processing of radio waves from GPS satellites (step S407). As described above, the reception time here is the time when one or two consecutive preambles are identified and the HOW data is acquired and decoded together. CPU41 discriminate | determines whether acquisition of date information was successful (step S408). If it is determined that the acquisition of date / time information has not been successful ("NO" in step S408), the CPU 41 ends the GPS date / time correction process and returns to the date / time correction process.

  If it is determined that the date / time information has been successfully acquired (“YES” in step S408), the CPU 41 determines whether the status b is “1001” or “1010” (step S409). ). If it is determined that the date / time is acquired, that is, if the date / time is acquired in the satellite date / time acquisition process or the standard radio wave date / time acquisition process within one month (third reference time) (“YES” in step S410). The CPU 41 determines whether or not the difference between the acquired date and time and the current date and time held by the timing circuit 46 is within 15 seconds (matching confirmation period) (step S411). If it is determined that it is within 15 seconds (“YES” in step S411), the process of the CPU 41 proceeds to the process of step S412. When it is determined that it is not within 15 seconds (“NO” in step S411), the CPU 41 ends the date correction process as it is, assuming that the acquisition date is incorrect, and returns to the date correction process. If it is determined that the status b is neither “1001” nor “1010” (“NO” in step S410), the processing of the CPU 41 proceeds to step S412 as it is.

  The CPU 41 corrects the current date and time of the clock circuit 46 based on the acquired date and time (step S412). The CPU 41 overwrites and updates the status b to “0001” and starts counting the counter related to the status b (step S413). Then, the CPU 41 ends the date correction process.

As described above, the electronic timepiece 1 of the present embodiment includes the clock circuit 46 that counts the date and time, the GPS reception processing unit 50 that receives the radio signal from the GPS satellite, and the antenna 51, and the CPU 41 receives the GPS signal. The reception period by the processing unit 50 is controlled, and date information is acquired based on the received radio signal. In addition to receiving radio waves from GPS satellites, the CPU 41 corrects the date and time counted by the timing circuit 46 using date and time information acquired from various places such as the long wave receiving unit 52 and the operation unit 47.
Then, the CPU 41 sets a first reference time determined in accordance with the acquisition method of the date / time information, for example, the elapsed time from the previous correction of the date / time counted by the timing circuit 46 to the acquisition of the current date / time information, for example, In the case of one month or less, a reading period, for example, a date is determined according to the elapsed time and date acquisition method, and the date and time within the reading period is acquired based on the content received by the GPS reception processing unit 50. At this time, the CPU 41 performs GPS reception processing while the reception period is a period during which the GPS reception processing unit 50 acquires a part of the navigation message data transmitted from the GPS satellite that can identify the current date and time. The unit 50 is operated.
Therefore, according to the accuracy of the date and time currently counted by the time counting circuit 46, data of a length necessary for obtaining accurate date and time information is received from the GPS satellite, thereby increasing the power consumption. It is possible to measure the time by acquiring the accurate date and time more reliably while suppressing the time.

  In other words, if it is expected that there will be no significant difference in date level, the date and time can be specified if HOWs included in all subframes can be acquired without acquiring WN data included only in subframe 1. Therefore, even if reception is started at an appropriate timing, the frame position can be identified and the necessary date and time information can be acquired with a reception time of about two subframes at the maximum, without compromising data reliability. Accurate date and time can be acquired with low power consumption.

  In addition, when the elapsed time from the previous date / time correction does not exceed a third reference time that is less than or equal to the first reference time, for example, one month here, the acquired date / time is narrower than the reading period (here, one day). It is determined whether or not it is within the consistency check period, here 15 seconds, and if a date and time not within the consistency check period has been acquired, the date and time counted by the timing circuit 46 is not corrected. . Therefore, by shortening the reception time, it is possible to compensate for the decrease in accuracy due to the omission of the parity check and the consistency check by receiving a plurality of times, and in particular, it is possible to prevent a date / time shift due to erroneous identification of the preamble.

Moreover, the long wave receiving part 52 and the antenna 53 which receive a standard radio wave from the outside are provided, and CPU41 can decode the signal demodulated by the said long wave receiving part 52, and can acquire date information. The correction history storage unit 43a stores information b [1] and b [3] related to the correction history by the standard radio wave reception, and the date and time correction by the radio wave reception from the GPS satellite based on the correction history information. A reception period and a reading period can be set.
Therefore, not only the reception of radio waves from GPS satellites, but other methods can also automatically acquire date and time information from the outside, so the period of radio wave reception from GPS satellites based on the date and time acquired in this way Accurate date and time information can be acquired while appropriately shortening. Therefore, power consumption can be reduced effectively.

  When receiving a radio wave from a GPS satellite, the CPU 41 sets a period during which 2 or 3 words are estimated to be received from the top of any subframe depending on the date and time counted by the clock circuit 46 as the reception period. Therefore, especially when it is assumed that the date and time difference of the timing circuit 46 is not large, the necessary signals, that is, the preamble and the HOW can be received in a short time without waste, and the power consumption can be reduced.

[Second Embodiment]
Next, the electronic timepiece 1 of the second embodiment will be described.
The internal configuration of the electronic timepiece 1 of the second embodiment is the same as that of the electronic timepiece 1 of the first embodiment, and will be described using the same reference numerals.

Next, the date and time correction operation in the electronic timepiece 1 of the second embodiment will be described.
In the date and time correction operation of this embodiment, status b is updated by executing status setting processing only when necessary, instead of operating the counter in real time by updating the status b. For this purpose, the correction history storage unit 43a stores correction history information related to the latest correction timing and correction method in addition to the status b.

FIG. 7 is a flowchart showing a control procedure by the CPU 41 of status setting processing executed in the electronic timepiece 1 of the second embodiment.
This status setting process is called and executed first as necessary, for example, before the standard radio wave date correction process and the GPS date correction process are executed.

  When the status setting process is started, the CPU 41 acquires the latest correction history information from the correction history storage unit 43a (step S301). The CPU 41 determines whether or not the date and time have been corrected within one day (24 hours) (step S312). Note that this period may be set to 23 hours 50 minutes instead of 24 hours so that the date and time can be corrected once a day by receiving radio waves from GPS satellites.

  If it is determined that the date / time has been corrected within one day (“YES” in step S312), the CPU 41 determines whether or not the latest date / time correction is due to radio wave reception from a GPS satellite. Is determined (step S313). When it is determined that the radio wave is received from the GPS satellite (“YES” in step S313), the CPU 41 sets the flag b [0] among the status b stored in the correction history storage unit 43a to “ 1 ”and the other flags b [1] to b [3] are set to“ 0 ”(step S314). That is, the set status b is “0001”. Then, the CPU 41 ends the status setting process.

  If it is determined that the date / time correction is not due to radio wave reception from the GPS satellite (“NO” in step S313), the CPU 41 determines whether date / time correction using a long-wave standard radio wave has been performed. (Step S315). If it is determined that the date and time correction using the long wave standard radio wave has been made (“YES” in step S315), the CPU 41 sets the second digit flag b [1] to “1”, The other flags b [0] and b [1] to b [3] are respectively set to “0” (step S316). That is, the set status b is “0010”. Then, the CPU 41 ends the status setting process.

  If it is determined that the date / time is not corrected using the long-wave standard radio wave (“NO” in step S315), the date / time is corrected by other methods, that is, the date / time is corrected manually here. Sets the third digit flag b [2] to “1” and sets the other flags b [0], b [1], and b [3] to “0” (step S317). That is, the set status b is “0100”. Then, the CPU 41 ends the status setting process.

  If it is determined in the determination process in step S312 that the date and time have not been corrected within one day (“NO” in step S312), the CPU 41 determines whether the GPS satellite has received a predetermined number of days, for example, within one month. It is determined whether or not the date and time has been corrected by receiving the radio wave (step S321). If it is determined that the date and time have been corrected by receiving radio waves from GPS satellites within one month (“YES” in step S321), the CPU 41 sets the flag b [3] of the most significant bit to “1”. The status b is set to “1001” (step S322). If the operation interval of the status setting process is longer than one day, the status b may not be “0001” in the first status setting after the date / time correction by the radio wave reception from the GPS satellite is performed. The CPU 41 collectively changes the values of the flags b [0] to b [3] to set the status b to “1001”. Then, the CPU 41 ends the status setting process.

  If it is determined that the date / time has not been corrected by radio wave reception from the GPS satellite within one month (“NO” in step S321), the CPU 41 sets the flag b [0] and the flag b [3]. Each is set to “0” (step S323).

  Next, the CPU 41 determines whether or not the date and time have been corrected by the long standard wave within one month (step S324). If it is determined that the date / time correction by the standard radio wave has been performed (“YES” in step S324), the CPU 41 sets the flags b [1] and b [3] to “1” (step 1). S322), status b is set to “1010”. On the other hand, when it is determined that the date and time have not been corrected (“NO” in step S324), the CPU 41 sets the flag b [1] and the flag b [3] to “0”, respectively (step S324). S325).

  The CPU 41 determines whether or not the date and time have been manually corrected within one month (step S326). When it is determined that the date and time have been manually corrected (“YES” in step S326), the CPU 41 sets the flag b [3] to “1” (step S322), thereby setting the status b to “b”. “1100”. When it is determined that the date and time have not been manually corrected (“NO” in step S326), the CPU 41 sets the flag b [2] and the flag b [3] to “0”, respectively (step S326). S327). Then, the CPU 41 ends the status setting process.

  FIGS. 8 and 9 are flowcharts showing control procedures by the CPU 41 of the standard radio wave date correction process and the GPS date correction process executed in the electronic timepiece 1 of the present embodiment, respectively.

The standard radio wave date and time correction process of the second embodiment is the same as the standard radio wave date and time correction process executed in the electronic timepiece 1 of the first embodiment, except that the process of step S209 is omitted. Moreover, the GPS date correction process of 2nd Embodiment is the same as the GPS date correction process performed in the electronic timepiece 1 of 1st Embodiment except the process of step S413 being abbreviate | omitted.
That is, in these standard radio wave date correction processing and GPS date correction processing, status b rewriting and counter operation are not performed in real time when date correction is performed.

  As described above, the electronic timepiece 1 according to the second embodiment calculates the elapsed time from the previous date and time correction used for determining the reading period, the alignment confirmation period, and the like only when necessary. Thus, the same effect as that of the electronic timepiece 1 of the first embodiment can be obtained.

[Third Embodiment]
Next, the electronic timepiece 1 of the third embodiment will be described.
The electronic timepiece 1 of the third embodiment has the same configuration as the internal configuration of the electronic timepiece 1 of the first embodiment and the second embodiment, and description thereof is omitted because the same reference numerals are used.

Next, the date correction operation in the electronic timepiece 1 of the third embodiment will be described.
FIG. 10 is a flowchart showing a control procedure by the CPU 41 of status setting processing executed in the electronic timepiece 1 of the third embodiment.

  The status setting process of the third embodiment is the same as the status setting process of the second embodiment except that the processes of steps S302 to S305 are added, and the same processes are denoted by the same reference numerals. Detailed description is omitted.

After acquiring the latest date / time correction history information from the correction history storage unit 43a (step S301), the CPU 41 determines whether date / time correction has been performed within half a year (second reference time) (step S302). . If it is determined that the date and time have been corrected within half a year (“YES” in step S302), the processing of the CPU 41 proceeds directly to step S312. If it is determined that the date / time has not been corrected within six months (“NO” in step S302), the CPU 41 causes the display unit 48 to display a message prompting the user to correct the date / time. A control signal is output to the display driver 49 (step S303). When the electronic timepiece 1 includes a sound generation unit that generates a sound such as a buzzer or a vibration motor that generates vibration, the CPU 41 outputs a control signal to these drivers and operates together with the display unit 48. You may let them.
Then, the CPU 41 waits for the date correction operation within the maximum time set in advance, that is, the input of the command relating to the manual input operation of the date data and the reception of the standard radio wave, and whether or not the command input of the time correction operation has been received. Is determined (step S304).
Note that the CPU 41 normally performs the notification operation and the input standby operation according to steps S303 and S304 when the date and time correction process and the status setting process associated therewith are performed at a time when the user does not use the electronic timepiece 1, such as midnight. May be performed at a time different from these, for example, during the day or in the evening.

  If it is determined that there is no command input related to the date / time correction operation (“NO” in step S304), the processing of the CPU 41 proceeds to step S312. If it is determined that a command for date correction operation has been input (“YES” in step S304), the CPU 41 performs processing related to date correction in accordance with the input operation (step S305). For example, when a manual date / time input operation is performed, the date / time of the clock circuit 46 is overwritten and changed to the date / time. If a standard radio wave reception command is input, the CPU 41 executes standard radio wave time correction processing. The standard radio wave date and time correction process in this embodiment is the same as the process shown in FIG. Then, the CPU 41 shifts the process to step S312.

FIG. 11 is a flowchart showing a control procedure by the CPU 41 of the GPS time correction process executed in the electronic timepiece 1 of the third embodiment.
This GPS time correction process is the same as the GPS time correction process of the second embodiment except that the processes of step S420 and step S421 are added. The same processes are denoted by the same reference numerals and are described in detail. Is omitted.

  If the status b is determined not to be “1001” or “1010” in the determination process in step S410 (“NO” in step S410), the CPU 41 further sets the status b to “0100” or “1100”. It is determined whether or not any of them (step S420). If it is determined that neither “0100” nor “1100” is present (“NO” in step S420), the processing of the CPU 41 proceeds to step S412.

  When it is determined that the status b is “0100” or “1100” (“YES” in step S420), the CPU 41 determines the difference between the date and time acquired from the GPS reception processing unit 50 and the date and time of the timing circuit 46. Is within one hour (step S421). If it is determined that the time is within one hour (“YES” in step S421), the process of the CPU 41 proceeds to step S412. If it is determined that it is not within one hour (“NO” in step S421), the CPU 41 ends the GPS time adjustment process as it is, and returns the process to the time adjustment process.

As described above, in the electronic timepiece 1 according to the third embodiment, when the elapsed time from the previous date / time correction exceeds the first reference time, the second reference time, here, six months, the CPU 41 notifies the user. On the other hand, a control signal is output to the display driver 49 so as to cause the display unit 48 to display the date and time correction request.
Therefore, if the date and time information cannot be obtained automatically due to GPS satellites or standard radio waves for a long period of time, the estimated date and time can be entered manually, for example, in minutes, or the user's action The accuracy of the date / time information can be improved by causing the user to receive a radio wave from a GPS satellite or receive a standard radio wave in a state where the user has moved to a place with good reception conditions according to the command. In addition, by such processing, in particular, input operation from the operation unit 47 of the user, date / time information related to the reading period setting when receiving radio waves from the GPS satellite is acquired, and even in such a case, the GPS satellite can be efficiently The increase in power consumption can be suppressed by shortening the radio wave reception time.

  In addition, when correcting the date and time by receiving radio waves from the GPS satellite, the CPU 41 sets an alignment confirmation period when the previous date and time correction is due to manual operation, and the previous date and time correction is the radio wave from the GPS satellite. It is set wider than the consistency check period set when it is performed by reception. That is, even if the input related to the date correction by manual operation is rough, the date correction by radio wave reception from the GPS satellite can be performed without greatly reducing the reliability. Accordingly, while not burdening the user with the date / time input setting, the input / date data is effectively used to set the reading period and the alignment confirmation period, thereby shortening the receiving time from the GPS satellite and acquiring the data. It can be used to maintain time accuracy.

[Fourth Embodiment]
Next, an electronic timepiece 1 according to a fourth embodiment will be described.
The electronic timepiece 1 of the fourth embodiment has the same internal configuration as that of the electronic timepiece 1 of the first to third embodiments, and the same reference numerals are used for the same configuration and the description thereof is omitted.

  The date / time correction operation of the electronic timepiece 1 of the fourth embodiment is the same as the date / time correction operation of the electronic timepiece 1 of the second embodiment, except that the acquisition method of date / time information is partially changed in the GPS date / time correction processing. It is.

FIG. 12 is a flowchart showing a control procedure by the CPU 41 of the GPS date / time correction process executed by the electronic timepiece 1 of the fourth embodiment.
In this GPS date correction process, the determination process of step S405b is executed following the determination process of step S405, and any one of steps S407a and S407b is executed according to the result of the determination process of steps S405 and S405b. Except for this point, it is the same as the GPS date correction process executed by the electronic timepiece 1 of the second embodiment, and the same processes are denoted by the same reference numerals and detailed description thereof is omitted.

  As described above, in the signal received from the GPS satellite, the same 8-bit code string as the preamble can appear in another place. Among these, the WORD2 TOW-Count and the WORD3 WN have the same code string as the preamble at a specific date and time. For example, a subframe in which the upper 8 bits of the 17-bit code string of TOW-Count is “10001011” is 23:27:54 on the same day from the subframe starting at 22:36:48 every Thursday at UTC time. Up to the subframe starting in seconds. Therefore, in these subframes, the same code string as the preamble is detected continuously in WORD1 and WORD2.

  Therefore, when the time counted by the time counting circuit 46 is within the range, even when the time slightly deviates, the preamble may be erroneously identified. Therefore, in the electronic timepiece 1 of the present embodiment, when the timing circuit 46 is in the range (strictly, it is not necessary to be in this range and can be set wider including an error and a margin), it is adjacent. The subframe data is received, and the preamble of WORD1 and the same code string as the preamble in the TOW-Count of WORD2 are identified. At this time, WORD2 is received twice, and it is good also as preventing misidentification more by confirming that the TOW-Count decoded and acquired from each increases by 1.

  As shown in FIG. 12, when it is determined that the status b is neither “1001” nor “1010” in the determination process in step S405 (“NO” in step S405), the CPU 41 determines whether the status is b from the GPS satellite. A radio wave is received and date information is acquired (step S407b). At this time, the CPU 41 causes the GPS reception processing unit 50 to receive a transmission radio wave from a GPS satellite until two consecutive preambles are identified, and decodes date / time information from the HOW between the identified two preambles. Get it. If it is determined that the status b is either “1001” or “1010” (“YES” in step S405), the CPU 41 further indicates that the current time counted by the time counting circuit 46 is UTC and is Thursday. It is determined whether it is between 22:36:48 and 23:27:59 (step S405a). If it is determined that this is the period (“YES” in step S405a), the processing of the CPU 41 proceeds to step S407b. If it is determined that this period is not reached ("NO" in step S405a), the CPU 41 sends the date / time information to the GPS reception processing unit 50 and sets it (step S406), or only one preamble or 1 The GPS satellite transmission radio waves are received until one Preamble (WORD1) and HOW (WORD2) are obtained (step S407a).

  As described above, in the electronic timepiece 1 according to the present embodiment, the length of the radio wave reception time from the GPS satellite is adjusted according to the estimated amount of the time difference indicating the deviation of the date and time counted by the time counting circuit 46 from the accurate time. To do. That is, when the time difference is sufficiently shorter than the time of one frame (30 seconds), here, when it is about 15 seconds or less, the reception of the WORD1 preamble and the WORD2 HOW data is received in a short time. Even if there is a low possibility of date acquisition due to factors such as incorrect identification of the preamble, the power consumption is actively reduced, but if the time difference is large, the preamble at the beginning of two consecutive subframes is used. This reduces the possibility of erroneous identification of the preamble and prevents a decrease in reliability.

  Even when the time counted by the time counting circuit 46 is small from the exact time, the same code sequence as the preamble appears in the adjacent WORD 2 at a specific time. By receiving more than a subframe, Preamble and TOW-Count are reliably distinguished from each other to prevent erroneous identification.

[Fifth Embodiment]
Next, an electronic timepiece 1 according to a fifth embodiment will be described.
The electronic timepiece 1 of the fifth embodiment has the same internal configuration as the electronic timepiece 1 of the first to fourth embodiments, and the same reference numerals are used for the same configuration, and the description thereof is omitted.

  The date / time correction operation of the electronic timepiece 1 of the fifth embodiment is the same as the date / time correction operation of the electronic timepiece 1 of the third embodiment, except that the acquisition method of date / time information is partially changed in the GPS date / time correction processing. It is.

FIG. 13 is a flowchart showing a control procedure by the CPU 41 of the GPS date / time correction process executed by the electronic timepiece 1 of the fifth embodiment.
This GPS date and time correction process is performed by the electronic timepiece 1 of the third embodiment except that the process of step S407a is executed instead of step S407 and the process of step S407b is added. In addition, the processes in steps S407a and S407b are the same as those described in the description of the GPS date / time correction process in the fourth embodiment. Accordingly, the same processes are denoted by the same reference numerals and description thereof is omitted.

As described above, in the electronic timepiece 1 of the fourth and fifth embodiments, the time difference that the date and time counted by the time circuit 46 deviates from the exact date and time is calculated as the time error (step rate) of the time circuit 46 acquired in advance. ) And the elapsed time since the previous date and time correction, and the calculated time difference is not large, for example, within 15 seconds corresponding to an error for one month due to a crystal oscillator. A reception time of about a few words at the beginning of each subframe is set, and when the time difference is large, the reception time is set so that data of one subframe is completely received.
Therefore, when the time difference is small and the possibility of date and time acquisition failure due to factors such as erroneous identification of the preamble is low, the power consumption is actively reduced. On the other hand, when the time difference is large, two consecutive sub By identifying the preamble at the head of the frame, the possibility of erroneous identification of the preamble is reduced and the reliability is prevented from being lowered. Accordingly, it is possible to reliably acquire the accurate date and time as a whole while maintaining a good balance between reducing power consumption and maintaining reliability.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, in the above embodiment, the case where the clock circuit 46 has a clock error of about 15 seconds per month by the oscillation circuit 44 having a crystal oscillator has been described, but the present invention is not limited to this. When the timing error is smaller than this, a narrow reading period can be set based on the time of the timing circuit 46 over a longer period. On the contrary, when the timing error is large, a shorter period can be set. Only a narrow reading period can be set.

  In addition, a positioning satellite that is a target of radio wave reception is not limited to a GPS satellite. For example, when using the received radio waves of a GLONASS satellite, the data of the first string of each frame, particularly the data of the second of the day (sec in the current day), is not the data of the entire superframe or all of one frame. The present invention is applied to the case where the date and time data is acquired by using the time mark MK and the 2 second synchronization point is determined only by using the time mark MK at the end of each string and the fixed code “0” at the beginning. Efficient and accurate date and time can be acquired.

  In the above embodiment, the CPU 41 as the correction means acquires the date and time from the outside of the GPS satellite, but the reception of the standard radio wave transmitted from the broadcasting facility of the standard radio wave transmission station is mentioned. I can't. For example, the date / time information can be acquired from an external device (date / time information output destination) connected by communication using Bluetooth (registered trademark) communication or NFC (Near field communication). In this case, by using a device that can be connected to a network such as a mobile phone, a smartphone, a tablet terminal, or a PC as an external device, before acquiring date / time information from the external device, (Network Time Protocol) Accurate time information can be acquired from a server or the like.

  In the fourth embodiment, when the upper 8 bits of the TOW-Count are the same as the preamble, it is decided to switch to reception of one subframe or more to prevent erroneous identification of the preamble. The period set in advance as the period for receiving one or more subframes according to the overlap between the preamble and the preamble is not limited to this. TOW-Count 2nd bit or lower array, for example, the period when 2nd to 9th bit is the same code array as the preamble (Tuesday 11:18:24 to 25:30), 8 in WN The bit arrangement, for example, the week in which the lower 8 bits are the same as the preamble (once every 256 weeks) can be similarly handled.

  In the above embodiment, erroneous identification is prevented by receiving one subframe during a period in which the same code sequence as the preamble is scheduled. However, detection of the same code sequence as one preamble is immediately detected. As long as the identification of the preamble is not performed and it can be identified that the same code sequence as the preamble appears two or more times at the predicted interval in one subframe, it is not always necessary to receive one subframe.

  On the other hand, there is no method for acquiring date / time information from the outside other than the GPS satellite, and the date / time information acquisition method may be only the date / time correction by manual operation and the date / time correction by receiving the transmission radio wave from the GPS satellite.

  In the above embodiment, the status b is used to determine whether radio waves can be received from GPS satellites, the reception time, the presence / absence of date / time settings, etc., but the latest correction history stored in the correction history storage unit 43a is directly used. Then, the condition determination may be performed every time without using the status b.

  In addition, details such as the specific configuration and processing shown in the description of the above embodiment can be changed as appropriate without departing from the spirit of the present invention.

Although several embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and equivalents thereof.
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.

[Appendix]
<Claim 1>
A time counting means for counting the date and time;
Satellite radio wave receiving means for receiving radio signals from positioning satellites;
A reception period control means for controlling a reception period by the satellite radio wave reception means;
Satellite date and time acquisition means for acquiring date and time information based on the radio wave signal received by the satellite radio wave reception means;
Correction means for correcting the date and time counted by the time measuring means using the acquired date and time information;
With
The satellite date and time acquisition means, when the elapsed time since the last correction by the correction means is less than or equal to a first reference time determined according to the acquisition method of the date and time information, the elapsed time and the acquisition Determine the reading period according to the method, acquire the date and time within the reading period based on the content received by the satellite radio wave receiving means,
The reception period control means sets the reception period as a period during which the satellite date and time acquisition means acquires a part of data capable of identifying the current date and time among a series of data transmitted from the positioning satellite. An electronic timepiece characterized by operating a satellite radio wave receiving means.
<Claim 2>
2. The information processing apparatus according to claim 1, further comprising a notification unit that performs a predetermined operation for transmitting a date / time correction request to a user when the elapsed time exceeds a second reference time that is equal to or greater than the first reference time. The electronic watch described.
<Claim 3>
Alignment determining means for determining whether or not the acquired date and time is within an alignment confirmation period narrower than the reading period when the elapsed time does not exceed a third reference time equal to or less than the first reference time. ,
The correction means does not correct the date and time counted by the timing means using the acquired date and time when it is determined that the acquired date and time are not within the consistency check period. Item 3. The electronic timepiece according to any one of Items 1 and 2.
<Claim 4>
An operation means for accepting a user operation;
Manual date and time acquisition means for acquiring date and time information input by the operation means;
With
The correcting means is
The electronic timepiece according to claim 3, wherein the consistency check period for the date and time acquired by the manual date and time acquisition unit is set wider than the alignment check period for the date and time acquired by the satellite date and time acquisition unit.
<Claim 5>
An external communication means for communicating with the outside;
External date and time acquisition means for acquiring date and time information from outside by the external communication means;
Reading period setting storage means for storing the elapsed time and the acquisition method related to the reading period that is predetermined for each external date and time information output destination with respect to date and time information acquired by the external date and time acquisition means;
The electronic timepiece according to any one of claims 1 to 4, further comprising:
<Claim 6>
6. The reception period control means sets a period during which 2 words or 3 words are received from the head of a subframe as the reception period when the positioning satellite is a GPS satellite. The electronic timepiece described in any one of the items.
<Claim 7>
A deviation calculating means for calculating a time difference that the date and time counted by the time measuring means deviates from an accurate date and time based on the time measurement error of the time measuring means acquired in advance and the elapsed time;
When the time difference is equal to or less than a predetermined shift amount, the reception period control means sets the reception period to be the time during which the two words or three words are received, and when the time difference is larger than the shift amount, The electronic timepiece according to claim 6, wherein a time corresponding to one or more subframes is set as the reception period.
<Claim 8>
An overlapping period storage means for storing an overlapping period in which a code string identical to the leading code string defining the leading position of each subframe data in a signal from a GPS satellite appears in a code string portion related to date and time information;
The reception period control means detects the same code sequence as the head code string a plurality of times within the overlap period, and identifies the head position of the subframe based on the positional relationship of the plurality of detection positions, The electronic timepiece according to claim 6 or 7, wherein time information is acquired.
<Claim 9>
A method for correcting date and time data of an electronic timepiece comprising a time measuring means for counting the date and time and a satellite radio wave receiving means for receiving radio waves from positioning satellites,
A reception period control step for controlling a reception period by the satellite radio wave reception means;
A satellite date acquisition step of acquiring date information based on the radio signal received by the satellite radio wave reception means;
A correction step of correcting the date and time counted by the timing means using the acquired date and time information;
Including
In the satellite date acquisition step, when the elapsed time since the previous correction in the correction step is less than or equal to a first reference time determined according to the acquisition method of the date information, the elapsed time and Determine the reading period according to the acquisition method, acquire the date and time within the reading period based on the content received by the satellite radio wave receiving means,
In the reception period control step, the period during which a part of data that can identify the current date and time in the satellite date and time acquisition step is acquired as the reception period among the series of data transmitted from the positioning satellite. A method for correcting date and time data, characterized by operating a satellite radio wave receiving means.

1 Electronic clock 41 CPU
42 ROM
42a program 43 RAM
43a Correction history storage unit 44 Oscillation circuit 45 Frequency division circuit 46 Timekeeping circuit 47 Operation unit 48 Display unit 49 Display driver 50 GPS reception processing unit 51 Antenna 52 Long wave reception unit 53 Antenna 54 Power supply unit b Status

Claims (9)

A time counting means for counting the date and time;
Satellite radio wave receiving means for receiving radio signals from positioning satellites;
A reception period control means for controlling a reception period by the satellite radio wave reception means;
Satellite date and time acquisition means for acquiring date and time information based on the radio wave signal received by the satellite radio wave reception means;
An external communication means for communicating with the outside;
External date and time acquisition means for acquiring date and time information from outside by the external communication means;
Correction means for correcting the date and time counted by the time measuring means using the acquired date and time information;
With
The satellite time acquisition unit, an elapsed time from being performed the previous corrected by the correcting means, is determined according to the correction method of the previous time, the first following criteria hour according to the selection of the method for obtaining the day-time information In this case, the reading period according to the elapsed time and the acquisition method to be selected is determined, and the date and time within the reading period is acquired based on the content received by the satellite radio wave reception means,
The reception period control means sets the reception period as a period during which the satellite date and time acquisition means acquires a part of data capable of identifying the current date and time among a series of data transmitted from the positioning satellite. An electronic timepiece characterized by operating a satellite radio wave receiving means.   2. The information processing apparatus according to claim 1, further comprising a notification unit that performs a predetermined operation for transmitting a date / time correction request to a user when the elapsed time exceeds a second reference time that is equal to or greater than the first reference time. The electronic watch described. When the elapsed time does not exceed a third reference time that is equal to or less than the first reference time , the difference between the acquired date and time and the date and time counted by the timing means is within an alignment confirmation period that is narrower than the reading period. It is provided with a consistency determination means for determining whether or not
The correction means does not correct the date and time counted by the timing means using the acquired date and time when it is determined that the acquired date and time are not within the consistency check period. Item 3. The electronic timepiece according to any one of Items 1 and 2. An operation means for accepting a user operation;
Manual date and time acquisition means for acquiring date and time information input by the operation means;
Second alignment determination means for determining whether or not the difference between the date acquired by the manual date acquisition means and the date counted by the timing means is within a predetermined second alignment confirmation period;
With
The correcting means is
The electronic device according to claim 3, wherein the second consistency check period for the date and time acquired by the manual date and time acquisition unit is set wider than the alignment check period for the date and time acquired by the satellite date and time acquisition unit. clock. Correction method according to the obtained date and time information most recently by the satellite time acquiring means or the external time acquiring unit, and the reading period setting reading to store between at the elapsed according to the predetermined period in response to the correction method Storage means;
The electronic timepiece according to any one of claims 1 to 4, further comprising:   6. The reception period control means sets a period during which 2 words or 3 words are received from the head of a subframe as the reception period when the positioning satellite is a GPS satellite. The electronic timepiece described in any one of the items. A deviation calculating means for calculating a time difference that the date and time counted by the time measuring means deviates from an accurate date and time based on the time measurement error of the time measuring means acquired in advance and the elapsed time;
When the time difference is equal to or less than a predetermined shift amount, the reception period control means sets the reception period to be the time during which the two words or three words are received, and when the time difference is larger than the shift amount, The electronic timepiece according to claim 6, wherein a time corresponding to one or more subframes is set as the reception period. An overlapping period storage means for storing an overlapping period in which a code string identical to the leading code string defining the leading position of each subframe data in a signal from a GPS satellite appears in a code string portion related to date and time information;
The reception period control means detects the same code sequence as the head code string a plurality of times within the overlap period, and identifies the head position of the subframe based on the positional relationship of the plurality of detection positions, The electronic timepiece according to claim 6 or 7, wherein time information is acquired. A method for correcting date and time data of an electronic timepiece comprising a time measuring means for counting the date and time, a satellite radio wave receiving means for receiving radio waves from positioning satellites, and an external communication means for communicating with the outside ,
A reception period control step for controlling a reception period by the satellite radio wave reception means;
A satellite date acquisition step of acquiring date information based on the radio signal received by the satellite radio wave reception means;
An external date and time acquisition step of acquiring date and time information from the outside by the external communication means;
A correction step of correcting the date and time counted by the timing means using the acquired date and time information;
Including
The satellite time acquisition step, the elapsed time since been carried out last modified in said modifying step is determined according to the modified method of the previous time, the first reference of the selection of method for obtaining the day-time information If it is less than or equal to the time, determine the reading period according to the elapsed time and the acquisition method selected , and acquire the date and time within the reading period based on the content received by the satellite radio wave receiving means,
In the reception period control step, the period during which a part of data that can identify the current date and time in the satellite date and time acquisition step is acquired as the reception period among the series of data transmitted from the positioning satellite. A method for correcting date and time data, characterized by operating a satellite radio wave receiving means.

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