JP2006170698A - Radio station direction estimation apparatus, radio station direction estimation / radio wave emission apparatus, and radio station direction estimation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for estimating an azimuth of a radio station capable of highly precisely estimating the position of the radio stations, to provide a device for estimating the azimuth of the radio station and emitting radio waves, and to provide a method of estimating the azimuth of the radio station. <P>SOLUTION: The arrival direction of the desirable radio wave are estimated by an array antenna 1, frequency detection means 2 and radio wave arriving direction detection means 3. A position of the radio station estimation means 5 of ray trace method estimates the position of the radio station by the ray trace method based on the arrival direction of the estimated radio wave, and the 3-D map data from altitude/map database 4 provided with the 3-D map data. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a radio station direction estimation device, a radio station direction estimation / radio wave emission device, and a radio station direction estimation method that receive a radio wave emitted from a radio station and estimate the direction of the radio station from the received radio wave. Is.

  In recent years, the use of radio waves has increased remarkably, and as of the end of June 2004, there are more than 88 million domestic radio stations in operation. In particular, there are over 87 million radio stations of mobile telecommunications carriers found in mobile phones and the like. The majority of mobile phones exist in the 800 MHz band, and the usage situation at some frequencies is very crowded. Illegal radio stations with modified personal radios appear in this frequency band, preventing the operation of legal radio stations. For such an illegal radio station, a basic azimuth detecting device for detecting the direction of arrival of radio waves detects the direction of arrival of radio waves using a directional antenna such as a Yagi antenna.

  In addition, there has been an apparatus that performs azimuth detection using an omnidirectional aerial line and a directional aerial line (see, for example, Patent Document 1). Thus, the conventional detection device is a method for estimating the azimuth angle using the directivity of the antenna.

  Since the conventional azimuth detection device is configured as described above, the detection accuracy is limited to ± 10 to 20 ° in the azimuth accuracy of the maximum received power due to the half-value angle (beam width) of the directional antenna. Therefore, high-precision detection could not be performed. Furthermore, it is necessary to physically rotate the directional antenna.

Therefore, it is possible to electronically sweep and estimate the direction of arrival of radio waves received using the array antenna technology for radio waves of desired stations to be discovered by illegal radio stations, etc., and perform transmission beamforming in the estimated direction. There has been a radio wave azimuth position detection device capable of electronically controlling directivity in the same direction as a wave (see, for example, Patent Document 2).
Japanese Patent No. 2619144 Japanese Patent Application No. 2003-107144

  In the above conventional radio station direction estimation device, it is possible to estimate the position of a radio station with high accuracy using array antenna technology, but at a close distance as seen in ETC systems as well as illegal radio stations. In the case of operation for a legitimate radio station, position estimation with higher accuracy is required.

  The present invention has been made in view of the above-described conventional circumstances, and is a radio station direction estimating device, a radio station direction estimating / radiating device, and a radio station direction estimating method capable of highly accurately estimating the position of a radio station. The purpose is to provide.

  A radio station direction estimating apparatus according to the present invention includes a directional antenna that receives a desired radio wave, a frequency detection unit that detects a frequency of the desired radio wave from an output of the directional antenna, and an output result of the frequency detection unit. Using radio wave arrival direction estimation means for estimating the directions of a plurality of radio wave arrival waves and three-dimensional map data, and based on the received wave arrivals and the estimated radio wave arrival wave directions, Position estimation means for estimating the position of the transmitting radio station.

  With this configuration, the direction of arrival of radio waves is estimated using a directional antenna, and the position of the radio station is estimated using the ray tracing method using three-dimensional map data, so that the position of the radio station is estimated with high accuracy. be able to.

  In the radio station direction estimating apparatus of the present invention, the directional antenna is an array antenna.

  With this configuration, it is possible to estimate the direction of arrival of radio waves with high accuracy.

  A radio station direction estimation / radio wave emission apparatus according to the present invention includes a directional antenna that receives a desired radio wave, a frequency detection unit that detects a frequency of the desired radio wave from an output of the directional antenna, and a frequency detection unit that includes: Using the radio wave arrival direction estimation means for estimating a plurality of radio wave arrival directions of the received radio wave from the output result and three-dimensional map data, the radio wave is obtained by a ray tracing method based on the estimated radio wave arrival waves. A radio station direction estimating unit that estimates a position of a transmitting radio station, and calculates a directivity of a transmission radio wave based on the position of the radio station estimated by the position estimating unit A radio wave emitting unit having a transmission beam forming unit and a transmission radio wave emitting unit that emits a transmission radio wave based on the calculated directivity.

  With this configuration, the direction of arrival of radio waves is estimated using a directional antenna, and the position of a radio station is estimated using a ray tracing method using three-dimensional map data. In addition, since radio waves can be transmitted to the estimated position, spot transmission to a desired radio station is possible.

  In the radio station direction estimation / radio wave emission apparatus of the present invention, in the radio station direction estimation unit, the position estimation means includes Doppler frequency measurement means for measuring a Doppler frequency of the received signal, and the measurement is performed. The transmission position of the radio station is estimated based on the Doppler frequency, and the transmission beam forming means of the radio wave emitting unit is configured to move the radio station based on the estimated movement position of the radio station. The directivity of the transmission radio wave is controlled so as to follow.

  With this configuration, information such as the moving speed and moving direction of the target wireless station can be acquired, and the position of the wireless station can be estimated according to the information. Further, by performing transmission beamforming by predicting using the result, the directivity of the transmission radio wave can be controlled to the position to move in advance.

  Further, in the radio station direction estimation / radio wave emission apparatus of the present invention, a reception system including the directional antenna, the frequency detection unit, and the radio wave arrival direction estimation unit of the radio station direction estimation unit, and the position estimation unit, Are connected by a first communication line, and a first communication line control means for controlling the first communication line, a transmission system including the radio wave emitting unit, and the position estimation means are connected by a second communication line. And a second communication line control unit that is connected and controls the second communication line.

  With this configuration, the reception system and the transmission system can be installed at different locations, and these remote controls can be performed.

  The radio station direction estimation / radio wave emission apparatus according to the present invention further includes a plurality of the reception systems and a plurality of the transmission systems, and the position estimation unit is configured to transmit the first communication line control unit via the first communication line control unit. Information from a plurality of reception systems is received, and information is transmitted to the plurality of transmission systems via the second communication circuit control means.

  With this configuration, a plurality of receiving systems and a plurality of transmitting systems can be installed at different locations and remotely controlled, so that it is possible to perform wide range and quick radio station direction estimation and radio wave emission.

  The radio station direction estimation method of the present invention includes a step of receiving a desired radio wave using a directional antenna, a step of detecting a frequency of the desired radio wave from an output of the directional antenna, and a reception from the detected frequency. A step of estimating a plurality of radio wave arrival directions of the received radio wave, and a position of a radio station transmitting the radio wave by a ray tracing method based on the estimated plurality of radio wave arrival waves using three-dimensional map data Estimating.

  With this method, the direction of radio wave arrival is estimated using a directional antenna, and the position of the radio station is estimated using the ray tracing method using three-dimensional map data, so that the position of the radio station is estimated with high accuracy. be able to.

  According to the present invention, it is possible to provide a radio station direction estimation device, a radio station direction estimation / radio wave emission device, and a radio station direction estimation method capable of highly accurately estimating the position of a radio station.

(First embodiment)
FIG. 1 is a block diagram showing a schematic configuration of a radio station position estimation apparatus according to the first embodiment of the present invention. As shown in FIG. 1, the radio station position estimation apparatus according to the first embodiment includes an array antenna 1, which is an example of a directional antenna, frequency detection means 2, radio wave arrival direction estimation means 3, and three-dimensional map data. And an altitude / map database 4 and a ray tracing method radio station position estimating means 5.

  First, the operation of the receiving system having the array antenna 1, the frequency detection means 2, and the radio wave arrival direction estimation means 3 will be described. FIG. 2 is a diagram for explaining the operation of the receiving system according to the first embodiment of the present invention.

  The array antenna 1 includes a plurality of omnidirectional antenna elements, and the gain and directivity of each antenna have the same characteristics. When a certain radio wave is received by the array antenna 1, reception power is induced for each antenna element. At that time, since the route difference from the radio wave emission source to each antenna element is different, the amplitude, phase, and delay time are different. Received. The frequency detection means 2 sweeps the frequency of the received radio wave and finds a desired radio wave.

  The radio wave arrival direction estimation unit 3 performs an estimation calculation of the radio wave arrival direction based on the output of the frequency detection unit 2. As shown in FIG. 2, the output of the frequency detection means 2 is A / D converted to capture digital data (step S301), the amplitude, phase, and delay time are obtained (step S302), and the correlation between each antenna element is calculated. After calculation (step S303), eigenvalue decomposition (step S304), S / N separation (step S305), spectrum calculation (step S306), peak detection (step S307), and arrival direction estimation calculation (step S308) To estimate the direction of arrival of radio waves.

  The MUSIC (Multiple Signal Classification) method and the Capon method are well known as calculation methods for estimating the direction of arrival of radio waves. The direction of arrival can be estimated by the above-described operation. In the radio wave arrival direction estimation using the MUSIC method, for example, an estimation accuracy of 1 to 2 degrees can be obtained with an array antenna having 6 to 8 elements in the 900 MHz band.

  The array antenna includes a linear array system in which the antenna elements are arranged in a line and a circular array system in which the antenna elements are arranged on the circumference at equal intervals.

  In the linear array system, it is only necessary to consider adjacent antennas for inter-element coupling of each antenna, and the inter-element correlation is good. Since the surface on which the elements are arranged becomes the antenna opening surface, the estimation accuracy improves when radio waves arrive at the opening surface, while the opening surface becomes narrower when radio waves arrive in the direction in which the elements are arranged. Accuracy deteriorates. For this reason, the linear array method is preferably installed in parallel with the road or the like.

  On the other hand, in the circular array method, the coupling between the elements of each antenna is stronger than that of the linear array method, and the correlation between the antenna elements is deteriorated compared to the linear array method, but the antenna aperture is directed to all directions of 360 degrees. Yes. For this reason, the circular array method is suitable for installation on the roof of a high-rise building such as a building to receive radio waves in all directions on a plane.

  Thus, the arrival direction estimation result obtained by the receiving system is input from the altitude / map database 4 to the ray tracing radio station position estimating means 5 together with the three-dimensional map data.

  FIG. 3 is a diagram illustrating the principle of the radio position estimation method using the ray tracing method. In the ray tracing method, radio waves are regarded as rays (rays) using geometric optics. Due to Fermat's principle, the propagation path takes a path that minimizes the passage time on a medium with the same refractive index and the same quality. Accordingly, as shown in FIG. 3 (a), the ray travels straight and passes through while attenuating free space, reflecting off obstacles, and attenuating walls and windows. Further, as shown in FIG. 3B, the ray reaches the reception point through diffraction and scattering at the corner of the building.

  The attenuation due to reflection and transmission depends on the incident angle, polarization, and the material and thickness of the obstacle and can be calculated. At the diffraction end, it can be replaced by launching a ray as a new wave source. From these facts, if the number of obstacles existing in the propagation path is finite, the propagation path can be expressed by a limited number of rays. In this way, a method of deriving a received electric field, delay, and path route from the number and intensity of rays reaching the reception point based on geometric optics is called a ray tracing method.

  Next, the wireless position estimation method of this embodiment will be described. FIG. 4 is an operation explanatory diagram of the radio station position estimation method using the ray tracing method according to the first embodiment of this invention.

  As shown in FIG. 4, the altitude / map database 4 stores two types of data. One is an elevation database, which stores the elevation above sea level such as elevation data issued by the Geospatial Information Authority of Japan, and reflects the altitude of the radio wave emission source / reception system due to the unevenness of the ground surface and the ground level and building elevation of the propagation path Use to make it.

  On the other hand, the map database stores the natural environment such as rivers and mountains, roads such as national roads and prefectural roads, public facilities, high-rise buildings, general houses, and other building data. It is used to use the map environment information.

  The output result of the altitude / map database 4 and the output result of the radio wave arrival direction estimation means 3 are input to the ray tracing radio station position estimation means 5. As a result, the position of the target radio station is estimated by back-calculating the propagation path of the ray using the propagation environment information in the altitude / map database for the amplitude and phase of each incoming wave received by the array antenna at the receiving point. can do.

  FIG. 5 is a conceptual diagram for explaining a position estimation operation by the radio station position estimation apparatus according to the first embodiment of the present invention. This figure shows a state in which a target radio station existing in a certain area is discovered.

  First, the array antenna 1 is installed in an area where a radio station is to be monitored. In the case of the linear antenna, the array antenna 1 is installed so that the opening surface faces the target area because the opening surface is orthogonal to the linear arrangement.

  The frequency detection means 2 finds the transmission radio wave of the target radio station, and calculates the direction, amplitude, and phase of each incoming wave by the radio wave arrival direction means. On the other hand, the altitude / map database 4 generates a three-dimensional map environment including the sea level.

  The information received by the array antenna 1 and the three-dimensional map data are input to the ray tracing radio station position estimating means 5. The ray tracing method radio station position estimation means 5 performs a radio wave propagation analysis by performing a ray tracing simulation based on reflection, refraction, diffraction, and scattering of radio waves. A more accurate position of the target radio station can be estimated by evaluating the result together with the direction, amplitude, and phase of each incoming wave. In particular, the position of the radio station can be estimated three-dimensionally.

  According to the radio station position estimation apparatus of the first embodiment of the present invention, the radio wave arrival direction estimation information detected by the array antenna and the high-accuracy propagation analysis by the ray tracing method are combined to The position can be estimated with high accuracy. That is, the direction of arrival of radio waves is estimated using a directional antenna, and the position of a radio station is estimated using a ray tracing method using three-dimensional map data. Therefore, the position of a radio station can be estimated with high accuracy. it can.

(Second Embodiment)
FIG. 6 is a block diagram showing a schematic configuration of a radio station position estimation / radio wave emission apparatus according to the second embodiment of the present invention. In the figure, the same reference numerals are given to the portions overlapping those in FIG. 1 described in the first embodiment.

  As shown in FIG. 6, the radio station position estimation / radio wave emission apparatus of the present embodiment has a transmission beam forming 6, transmission radio wave emission means 7, transmission, in addition to the configuration of the radio station position estimation apparatus shown in FIG. A transmission system having an array antenna 8;

  The transmission beamforming 6 calculates the directivity of the transmission radio wave based on the radio wave arrival position estimation result obtained from the ray tracing radio station position estimation means 5, and transmits the radio wave having the directivity by the transmission array antenna 8. . This operation is similar to the calculation processing of the radio wave arrival direction estimation means 3 shown in FIG. 2, and weights such as phase, amplitude, and delay time are applied to the transmission array antenna 8 composed of non-directional antenna elements. For each antenna element. As a result, directivity control can be performed without using a directional antenna as found in the Yagi antenna.

  The transmission radio wave emitting means 7 transmits a transmission signal from the transmission array antenna 8 in a desired target direction based on the directivity formed electronically by the transmission beam forming 6.

  Note that the receiving array antenna 1 and the transmitting array antenna 8 may be configured separately, or may transmit and receive from one array antenna by sharing the antenna.

  Further, wireless communication is usually communication with an opposite station, and two or more radio waves may be emitted at the same time. Here, in the array antenna technique, it is possible to estimate the arrival directions of radio stations that are simultaneously received up to a value obtained by subtracting 1 from the number of elements of the receiving array antenna 1. For example, in the case of an 8-element reception array antenna, it is possible to simultaneously estimate the direction of arrival for 7 waves obtained by subtracting 1 from 8. Based on the reception result of a plurality of waves, it is also possible to perform transmission by performing transmission beam forming of a plurality of waves.

  FIG. 7 is a block diagram showing a schematic configuration of a radio station position estimation / radio wave emission apparatus according to the second embodiment of the present invention. A case where the target radio station is an illegal radio station will be described.

  When the position of the illegal radio station that is the target radio station is estimated in the same manner as in the first embodiment, a warning radio wave (regulated radio wave) is issued so as to stop communication with the illegal radio station. At that time, the phase / amplitude / delay time of each antenna element of the transmission array antenna 8 is calculated so as to direct the directivity to the illegal radio station by the transmission beam forming 6 using the estimation result. The transmission radio wave emitting means 7 sends out the regulated radio wave to be transmitted from the transmission array antenna 8 toward the estimated position based on the directivity calculated by the transmission beam forming 6.

  This figure shows a case where the receiving system and the transmitting system are installed at separate locations, but the receiving system and the transmitting system may be installed at the same location. In particular, the receiving array antenna 1 and the transmitting array antenna 6 can be shared.

  According to the radio station position estimation / radio wave emitting apparatus of the second embodiment of the present invention, the radio wave arrival direction is estimated using a directional antenna, and the ray tracing method using three-dimensional map data is used. Since the position of the radio station is estimated, it is possible to estimate the position of the radio station with high accuracy and to transmit radio waves to the estimated position, so that spot transmission to a desired radio station is possible.

(Third embodiment)
FIG. 8 is a block diagram showing a schematic configuration of a radio station position estimation / radio wave emission apparatus according to the third embodiment of the present invention. In the same figure, the same code | symbol is attached | subjected to the part which overlaps with the figure demonstrated in the 1st-2nd embodiment.

  As shown in FIG. 8, the radio station position estimation / radio wave emission apparatus of the present embodiment is based on the result obtained by the radio wave arrival direction estimation means 3 in addition to the configuration described in the first and second embodiments. Doppler frequency calculation means 9 for performing Doppler frequency calculation is provided.

  The Doppler frequency calculation means calculates the moving direction and moving speed of the target radio station by calculating based on the direction / amplitude / phase information of each incoming wave input from the radio wave arrival direction estimating means 3. The ray tracing radio station position estimation means 5 estimates the destination of the target radio station based on the calculation result.

  If the target radio station is installed in a vehicle, for example, when moving, the approximate radio station moves on the road, so that the moving direction can be pattern-matched with the road data in the map database. As a result, position estimation with higher accuracy becomes possible.

  Furthermore, by applying the position estimation and movement prediction results to transmission beamforming, it is possible to transmit to the current location of the target wireless station and the location where it is predicted to move.

  FIG. 9 is a conceptual diagram illustrating a position estimation operation by the radio station position estimation / radio wave emission apparatus according to the third embodiment of the present invention. For example, as shown in FIG. 9, when a radio station whose position is to be estimated is a mobile object, such as a radio equipment-equipped vehicle C having a transmission antenna A, each incoming wave is caused by the Doppler effect. Frequency fluctuation has occurred. The frequency fluctuation in each incoming wave is calculated by the Doppler frequency calculation means 9 to obtain the moving speed and acceleration of the target radio station.

  By reflecting this information on the calculation of the ray tracing radio station position estimating means 5, the position of the moving radio station is estimated. Furthermore, as a characteristic of mobile communication by vehicles, etc., most radio stations move on the road. Therefore, by performing pattern matching on road information among the map environment information provided from the altitude / map database 4, the position of the radio station can be determined. The estimation accuracy can be further increased.

  The target location of the target radio station is predicted by reflecting the position estimation result of the target radio station to the transmission side by the ray tracing method radio station position estimation means, performing transmission beamforming, and outputting the radio wave from the transmission array antenna. Communication can be performed while transmitting or following to

  According to the third embodiment of the present invention, information such as the moving speed and moving direction of the target wireless station can be acquired, and the position of the wireless station can be estimated according to the information. Further, by performing transmission beamforming by predicting using the result, the directivity of the transmission radio wave can be controlled to the position to move in advance.

(Fourth embodiment)
FIG. 10 is a block diagram showing a schematic configuration of a radio station position estimation / radio wave emission apparatus according to the fourth embodiment of the present invention. In the same figure, the same code | symbol is attached | subjected to the part which overlaps with the figure demonstrated in 1st-3rd embodiment.

  As shown in FIG. 10, in addition to the configuration described in the first to third embodiments, the radio station position estimation / radio wave emission apparatus of the present embodiment includes a first line control means 10 and a second line control. Means 21.

  The first circuit control means 10 and the second circuit control means include a reception system including a reception array antenna 1, a frequency detection means 2, and a radio wave arrival direction estimation means 3, a transmission beam forming 6, a transmission A transmission system having the radio wave emission means 7 and the transmission array antenna 8 can be separated and installed.

  The first circuit control means 10 performs line control such as a telephone to control and control the output result of the reception system at a remote location, and the second circuit control means 11 outputs the output of the ray tracing radio station position estimation means 5 The result is transmitted to a line control such as a telephone. By having the remote control function, the reception system means and the transmission system means can be installed in the same place or in different places and can be remotely controlled.

  FIG. 11 is a conceptual diagram illustrating the position estimation operation by the radio station position estimation / radio wave emission apparatus according to the fourth embodiment of the present invention. As shown in FIG. 11, the reception system and the transmission system are installed separately. The first line control means 10 performs line control such as a telephone to manage the output result of the reception system at a remote place. The output result of the ray tracing method radio station position estimating means 5 is transmitted to a line such as a telephone, and the second line control means 11 transmits the result to the transmission system.

  In this way, by providing the first line control means 10 and the second line control means 11, it becomes possible to place the transmission system and the reception system in different places. Further, if any of the first line control means, the ray-trace method radio station position estimation means 5 or the line control means 11 has a function as a remote control means, the reception system and the transmission system can be connected to the summit or the building rooftop. It can be installed in a remote location such as an office to collect information on radio waves and emit normal radio waves. Since illegal radio stations have random appearance times and appearance times, a system that can be remotely controlled has the advantage of reducing the number of radio wave monitoring personnel for finding illegal radio stations.

  According to the fourth embodiment of the present invention as described above, the reception system and the transmission system can be installed at different locations, and these remote controls can be performed.

(Fifth embodiment)
FIG. 12 is a block diagram showing a schematic configuration of a radio station position estimation / radio wave emission apparatus according to the fifth embodiment of the present invention. In the same figure, the same code | symbol is attached | subjected to the part which overlaps with the figure demonstrated in 1st-4th embodiment.

  As shown in FIG. 12, the radio station position estimation / radio wave emission apparatus of this embodiment includes two or more reception systems and two or more transmission systems. In FIG. 12, there are two reception systems including an array antenna 1, frequency detection means 2 and radio wave arrival direction estimation means 3, and a reception system including array antenna 12, frequency detection means 13 and radio wave arrival direction estimation means 14. A case with a receiving system is shown. The transmission system includes a transmission system having a transmission beam forming 6, a transmission radio wave emitting means 7, and a transmission array antenna 8, and a transmission system having a transmission beam forming 15, a transmission radio wave emission means 16, and a transmission array antenna 17. The case with is shown.

  The first line control means 10 performs line control such as a telephone to control the output result of the reception system at a remote place, and the second line control means 11 is the ray tracing method radio station position estimating means 5. The output result is transmitted to line control such as a telephone.

  When a target radio wave is found in a receiving system that estimates the direction of arrival of radio waves installed at multiple locations, the discovered radio wave direction estimation information is automatically communicated to related parties or remote locations, and one or more of the multiple transmission systems By transmitting from the location, it has the effect of quickly performing the processing after finding the target radio wave.

  FIG. 13: is a conceptual diagram explaining the position estimation operation | movement by the radio station position estimation / radio wave emission apparatus which concerns on the 5th Embodiment of this invention. As shown in FIG. 13, when a target radio wave is found in a reception system that performs radio wave arrival direction estimation installed at a plurality of locations, the discovered radio wave direction estimation information is automatically communicated to related parties, remote locations, and the like. By performing transmission from one or a plurality of locations in the transmission system, it is possible to quickly perform processing after finding the target radio wave. As mentioned earlier, the location and time of appearance of illegal radio stations are random, so a system that can remotely control multiple locations simultaneously can reduce the number of radio monitoring personnel for illegal radio station discovery There is.

  According to the fifth embodiment of the present invention as described above, a plurality of reception systems and a plurality of transmission systems can be installed at different locations and remotely controlled, so that wide-range and quick radio station direction estimation is possible. And radio wave emission

  The radio station position estimation apparatus or the radio station position estimation / radio wave emission apparatus according to the first to fifth embodiments of the present invention described above includes, for example, measures against illegal radio stations, ETC systems, RF tag readers / The present invention can also be applied to measures against legitimate wireless stations such as a short-range wireless system using a writer and a short-range wireless network such as a wireless LAN. In other words, it is suitable for radio wave monitoring operation and radio wave regulation operation for illegal radio stations, radio wave monitoring for legal stations, and organizing the environment by suppressing radio wave interference.

  For example, in ETC, radio stations are provided for each lane. In ETC and wireless LAN, radio stations may be provided relatively close to each other, so that radio waves output from a plurality of radio stations are likely to interfere with each other. It is in. Therefore, by using the radio station position estimation apparatus / radio station position estimation / radio wave emission apparatus according to the embodiment of the present invention, it is clear which radio station is transmitting radio waves to the place where the reception antenna is installed. Therefore, a more preferable communication environment can be obtained by controlling the transmission power and transmission direction of the wireless station using the information. In addition, in the transmission system of the wireless station position estimation / radio wave emitting apparatus according to the embodiment of the present invention, spot transmission to a desired wireless station is possible, so that control information for the wireless station can be transmitted. .

  In a short-distance wireless system using an RF tag reader / writer, a user often carries the reader / writer and moves. Therefore, the radio station position estimation apparatus / radio station position estimation / radio wave emission apparatus of the embodiment of the present invention is used to monitor the radio wave from the reader / writer, and to the detected reader / writer, a warning or transmission power -By controlling the transmission direction, etc., it is possible to suppress the influence of the moving reader / writer on the surroundings.

  The radio station direction estimation apparatus, radio station direction estimation / radio wave emission apparatus, and radio station direction estimation method of the present invention have the effect of being able to estimate the position of a radio station with high accuracy. This is useful for monitoring radio stations.

The block diagram which shows schematic structure of the radio station position estimation apparatus which concerns on the 1st Embodiment of this invention. Operation explanatory diagram of the receiving system of the first embodiment of the present invention The figure which shows the principle of the radio position presumption method by ray tracing technique Operation explanatory diagram of the radio station position estimation method by the ray tracing method of the first embodiment of the present invention FIG. 3 is a conceptual diagram for explaining a position estimation operation by the radio station position estimation apparatus according to the first embodiment of the present invention. The block diagram which shows schematic structure of the radio station position estimation / radio wave emission apparatus which concerns on the 2nd Embodiment of this invention. The conceptual diagram explaining the position estimation operation | movement by the radio station position estimation / radio wave emission apparatus which concerns on the 2nd Embodiment of this invention The block diagram which shows schematic structure of the radio station position estimation / radio wave emission apparatus which concerns on the 3rd Embodiment of this invention. The conceptual diagram explaining the position estimation operation | movement by the radio station position estimation / radio wave emission apparatus which concerns on the 3rd Embodiment of this invention The block diagram which shows schematic structure of the radio station position estimation / radio wave emission apparatus which concerns on the 4th Embodiment of this invention. The conceptual diagram explaining the position estimation operation | movement by the radio station position estimation / radio wave emission apparatus which concerns on the 4th Embodiment of this invention The block diagram which shows schematic structure of the radio station position estimation / radio wave emission apparatus which concerns on the 5th Embodiment of this invention. The conceptual diagram explaining the position estimation operation | movement by the radio station position estimation / radio wave emission apparatus which concerns on the 5th Embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 12 Reception array antenna 2, 13 Frequency detection means 3, 14 Radio wave arrival direction estimation means 4 Elevation / map database 5 Ray tracing method radio station position estimation means 6, 15 Transmission beam forming 7, 16 Transmission radio wave emission means 8, 17 Transmitting array antenna 9 Doppler frequency calculation means 10 First line control means 11 Second line control means

Claims (7)

A directional antenna that receives the desired radio wave;
Frequency detection means for detecting the frequency of the desired radio wave from the output of the directional antenna;
Radio wave arrival direction estimation means for estimating the direction of a plurality of radio wave arrival waves from the output result of the frequency detection means,
Using three-dimensional map data, based on the received incoming wave and the estimated radio wave arrival wave direction, position estimation means for estimating the position of a radio station that is transmitting the radio wave by a ray tracing method;
A radio station direction estimating apparatus. The radio station direction estimating apparatus according to claim 1,
The radio station direction estimating apparatus, wherein the directional antenna is an array antenna. A directional antenna that receives a desired radio wave, a frequency detector that detects a frequency of the desired radio wave from the output of the directional antenna, and a plurality of radio wave arrival directions of radio waves received from the output result of the frequency detector Position estimation that estimates the position of the radio station that is transmitting the radio wave by the ray tracing method based on the estimated radio wave arrival waves using the radio wave arrival direction estimating means to estimate and the three-dimensional map data A radio station direction estimation unit having means,
Transmission beam forming means for calculating the directivity of the transmission radio wave based on the position of the radio station estimated by the position estimation means; Transmission radio wave emission means for emitting the transmission radio wave based on the calculated directivity; A radio wave emitter having
A radio station direction estimation and radio wave emission device. A radio station direction estimating / radiating device according to claim 3,
In the wireless station direction estimating unit, the position estimating means includes Doppler frequency measuring means for measuring a Doppler frequency of the received signal, and estimates a moving position of the wireless station based on the measured Doppler frequency. Is,
The transmission beam forming means of the radio wave emitting unit controls the directivity of the transmission radio wave so as to follow the movement of the radio station based on the estimated movement position of the radio station. Launcher. The radio station direction estimation / radio wave emission device according to claim 3 or 4,
A reception system including the directional antenna, the frequency detection unit, and the radio wave arrival direction estimation unit of the wireless station direction estimation unit is connected to the position estimation unit via a first communication line, and the first communication First communication line control means for controlling the line;
A second communication line control means for controlling the second communication line, wherein the transmission system including the radio wave emitting unit and the position estimation means are connected by a second communication line;
A radio station direction estimating and radio wave emitting device further comprising: The radio station direction estimation / radio wave emission device according to claim 5,
A plurality of transmission systems; and the position estimation means receives information from the plurality of reception systems via the first communication line control means; and A radio station direction estimating / radiating device for transmitting information to the plurality of transmission systems via communication circuit control means. Receiving a desired radio wave using a directional antenna;
Detecting the frequency of the desired radio wave from the output of the directional antenna;
Estimating a plurality of radio wave arrival directions of radio waves received from the detected frequency;
Using three-dimensional map data, based on the estimated plurality of radio wave arrival waves, estimating a position of a radio station transmitting the radio wave by a ray tracing method;
A wireless station direction estimation method comprising:

Images