CN103684630A - Recognition method and recognition device for transmitter identifiers in China mobile multimedia broadcasting (CMMB) network - Google Patents

Abstract

The invention discloses a method and device for identifying a transmitter ID in a CMMB network, which is used to solve the technical problem that the prior art cannot accurately identify the transmitter ID by using a correlation value identification method. According to the preset geographic location information of each transmitter, the measured transmitter identification signal information and the geographic location information of the measurement location, the present invention calculates the arrival time of the signal of the preset transmitter at the measurement location, and compares the location information of the preset transmitter. The arrival time of the signal at the measurement location and the time at which the measured transmitter identification signal arrives at the measurement location determine the preset transmitter identification corresponding to the measured transmitter identification. The present invention can accurately identify each transmitter when there are multiple transmitter identifications with the same autocorrelation value in the preset transmitter identification, which is beneficial to optimize the CMMB wireless network.

Description

A method and device for identifying a transmitter identifier in a CMMB network

technical field

The invention relates to the technical field of mobile digital multimedia broadcasting, in particular to a method and device for identifying a transmitter ID in a CMMB network.

Background technique

China Mobile Digital Multimedia Broadcasting (CMMB, China Mobile Multimedia Broadcasting) is a digital TV terrestrial transmission standard launched by my country's radio and television system. It adopts the mobile TV receiving standard STiMi (satellite and ground interactive multi-service infrastructure) independently developed by my country. In the broadcasting business frequency range from 30MHz to 3000MHz, the broadcasting system that transmits multimedia signals such as TV, broadcasting, and data information through satellite and terrestrial wireless can realize national roaming. CMMB uses two sets of receiving systems to support both U-band (470MHz~798MHz) and S-band (2635~2660MHZ). U-band receives signals from the ground forwarding network, and S-band receives TV broadcast signals from satellites.

CMMB adopts a single-frequency network (Single-Frequency Network, SFN) networking, and all transmitters in the SFN transmit the same signal at the same frequency at the same time, which has a good space diversity gain. The transmission signal of the CMMB single frequency network adopts Orthogonal Frequency Division Multiplexing (OFDM) technology, and there is a guard interval in front of each symbol frame. The system can ensure the orthogonality of subcarriers and prevent inter-carrier interference. interference.

In the CMMB system, the transmitter identification signal is located at the beginning of each time slot in the physical layer signal frame, and is used to distinguish different transmitters. The transmitter identification signal is a pseudo-random sequence with a length of 191 bits (when the physical layer bandwidth is 8M) or a length of 37 bits (when the physical layer bandwidth is 2M), and there are 256 sequences in total, of which sequence 0~sequence 127 are regions The identifier is used to identify the area where the transmitter is located, and is inserted into the even time slots in the signal frame for transmission; the sequence 128-255 is the transmitter identification, used to identify different transmitters in the same area, and is inserted into the odd time slots of the signal frame for transmission.

The CMMB physical layer frame structure is shown in Figure 1. The physical layer signal is a frame every 1 second, which is divided into 40 time slots. The length of each time slot is 25 ms, including 1 beacon and 53 OFDM symbols. Wherein, the structure of the beacon includes the identifier of the transmitter and two identical synchronization signals.

In the CMMB single-frequency network, identifying the signals of each transmitter is one of the basic tasks of digital TV single-frequency network optimization. The key to identifying the signal of the transmitter is to obtain various parameters of the CMMB wireless network and the relative time when the signal of each transmitter arrives at the measurement point at the measurement point. However, the premise of identifying the signals of each transmitter is that the transmitter ID can be correctly identified, and using the orthogonality of the transmitter ID is the basic method for identifying the transmitter ID and then identifying the signals of each transmitter. However, in the CMMB standard, the transmitter IDs are not all orthogonal sequences, so it is difficult to accurately identify the transmitter IDs based on the correlation value, which will lead to the inability to accurately distinguish the transmitter of the wireless signal in the actual measurement. Which transmitter, therefore, can not optimize the CMMB wireless network well according to the actual measured data.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method and device for identifying transmitter identification in a CMMB wireless network, which is used to solve the problem that the prior art cannot accurately identify the transmitter identification by using the correlation value identification method, and then cannot accurately identify the transmitter identification. Signal technical issues.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A method for identifying a transmitter identifier in a CMMB network, the method comprising:

Preset transmitter identification, transmitter geographic location information and transmitter parameters of all CMMB transmitters in the tested area;

Receive the measurement data, execute the correlation value calculation between the preset transmitter ID and the measured transmitter ID, and obtain the arrival time of the measured transmitter ID signal;

According to the geographical location of the preset transmitter, the current location of the receiver and the parameters of the transmitter, calculate the calculation results of each preset transmitter identification signal that is the same as the correlation value calculation result of the measured transmitter identification to arrive at the current location of the receiver from the preset position The time of arrival of the preset transmitter identification signal at the location;

According to the measured transmitter identification signal arrival time and the preset transmitter identification signal arrival time, identify the preset transmitter identification actually corresponding to the measured transmitter identification, and identify the preset transmitter identification with the closest arrival time as The transmitter identity to which the measured transmitter identity actually corresponds.

Based on a specific embodiment of the present invention, the method for obtaining the measured arrival time of the transmitter identification signal is specifically:

According to the transmission parameters of the wireless transmission channel corresponding to the measured transmitter identification signal, calculate the time taken by the transmitter signal corresponding to the measured transmitter identification signal from the transmitter to the receiver, or transmit the signal according to the signal carried in the wireless transmission channel Calculated as the difference between the time and the time at which the signal was received by the receiver.

Based on a specific embodiment of the present invention, the receiver's current geographic location information is obtained from an external geographic location information system through a built-in positioning module or through a data interface.

The present invention also provides a kind of identification device of transmitter mark in CMMB network, and this device comprises:

The preset parameter unit is used to store all CMMB transmitter identifications, transmitter geographic location information and transmitter parameters in the measured area;

The correlation value calculation unit is connected with the external wireless network parameter subsystem and the internal preset parameter unit, and is used to perform the correlation value calculation between the preset transmitter identification and the measured transmitter identification, and output the correlation value calculation result data to the relevant value result unit;

A correlation value result unit, configured to cache the correlation value calculation result data; the correlation value calculation result data at least includes: the measured transmitter identification, the preset transmitter whose correlation value is the same as the measured transmitter identification Machine ID and corresponding related values;

The time calculation unit is connected with the external wireless network parameter subsystem, the preset parameter participation and the correlation value result unit, and is used to calculate each preset in the correlation value result data that is the same as the correlation value calculation result of the measured transmitter identification The signal arrival time of each preset transmitter identification signal from the preset position to the receiver location, and the measured arrival time of the transmitter identification signal;

The identification unit is connected with the correlation value result unit and the time calculation unit, and is used to identify the preset transmitter actually corresponding to the measured transmitter ID according to the measured transmitter ID signal arrival time and the preset transmitter ID signal arrival time. Transmitter ID, outputs the identified transmitter ID.

Based on a specific embodiment of the present invention, the time calculation unit includes:

The first calculation unit is connected with the preset parameter unit and the correlation value result unit, and is used to calculate the correlation value calculation result of each preset transmitter identification that is the same as the correlation value calculation result of the measured transmitter identification in the correlation value result data Each preset transmitter identifying the arrival time of the signal when the signal arrives at the location of the receiver from the preset position, and outputs the calculation result to the identification unit;

The second calculation unit is connected with the external wireless network parameter subsystem, and is used for calculating the arrival time of the measured transmitter identification signal, and outputting the calculation result to the identification unit.

Based on a specific embodiment of the present invention, the device further includes a positioning module, and the positioning module outputs the geographic location information of the receiver to the time calculation unit.

Based on a specific embodiment of the present invention, the time calculation unit is also connected to an external geographic location information system, and obtains the current measurement location, that is, the geographic location information of the receiver, from the external geographic location information system through a data interface.

According to the preset geographic location information of each transmitter, the measured transmitter identification signal information and the geographic location information of the measurement location, the present invention calculates the arrival time of the signal of the preset transmitter at the measurement location, and compares the location information of the preset transmitter. The arrival time of the signal at the measurement location and the time at which the measured transmitter identification signal arrives at the measurement location determine the preset transmitter identification corresponding to the measured transmitter identification. The present invention can accurately identify each transmitter when there are multiple transmitter identifications with the same autocorrelation value in the preset transmitter identification, which is beneficial to optimize the CMMB wireless network.

Description of drawings

Fig. 1 is CMMB physical layer frame structure;

Fig. 2 is the structural representation of the CMMB wireless network analyzer used when usually carrying out drive test;

Fig. 3 is the structural representation of transmitter identification identification device in the CMMB wireless network provided by the present invention;

Fig. 4 is a schematic diagram of the amplitude and time relationship of two transmitter signals measured in embodiment 1;

Fig. 5 is a schematic diagram of the positional relationship of three preset transmitters in Embodiments 1 and 2;

Fig. 6 is a schematic diagram of the signal amplitude and time relationship of three preset transmitter signals arriving at the measurement point in embodiment 1;

7 is a schematic diagram of the corresponding relationship between the measured two transmitter signals and the preset transmitter signals determined in Embodiment 1;

Fig. 8 is a schematic diagram of the amplitude and time relationship of the three transmitter signals measured in embodiment 2;

Fig. 9 is a schematic diagram of the signal amplitude and time relationship of three preset transmitter signals arriving at the measurement point in embodiment 2;

FIG. 10 is a schematic diagram of the corresponding relationship between the three measured transmitter signals determined in Embodiment 2 and the preset transmitter signals.

Detailed ways

The basic idea of the present invention is: preset each transmitter identifier in the CMMB network and the corresponding geographic location information of each transmitter, and on the basis of performing correlation detection on the transmitter identifiers, the transmitters that cannot be identified through correlation value detection According to the preset geographic location information of each transmitter, the measured transmitter identifier and the geographic location information of the measurement location, calculate the time when the signal of the preset transmitter arrives at the measurement location, and compare the signal of the preset transmitter The arrival time at the measurement site and the time at which the measured transmitter identification signal arrives at the measurement site determine which preset transmitter identification the measured transmitter identification corresponds to.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.

Figure 2 is a schematic diagram of the structure of the CMMB wireless network analyzer used when performing a drive test. The CMMB wireless network analyzer contains two main parts, which are respectively the wireless network parameter measurement subsystem and the transmitter identification measurement analysis subsystem. Among them, the wireless network parameter measurement subsystem sends the measurement data to the transmitter identification measurement and analysis subsystem, and the transmitter identification measurement and analysis subsystem identifies the transmitter identification and gives the relative time delay of each transmitter signal. The measurement data includes, but is not limited to, the measured transmitter identification, the measured arrival time of the transmitter identification signal and other data.

Fig. 3 is the schematic structural diagram of transmitter identification identification device in the CMMB wireless network that the present invention provides, and this device is positioned at above-mentioned transmitter identification measurement and analysis subsystem, and this device specifically comprises: preset parameter unit, correlation value calculating unit, correlation value Result unit, time calculation unit, recognition unit.

The preset parameter unit is used to preset or store all CMMB transmitter identifiers, transmitter geographic location information and transmitter parameters in the measured area (province, city or district, county, etc.), and this unit can actually correspond to a Readable and writable storage media, such as EPROM, memory chips or magnetic storage media, etc., this unit can be connected with the relevant value calculation unit and the preset parameter unit through the data bus and the corresponding read and write control logic chip and control bus. The transmitter parameters should also include parameters used to calculate the transmission time of the transmitter signal in the network, such as transmission frequency, etc., when the transmission frequencies of the preset transmitters are different. The geographic location information includes longitude, latitude and altitude;

The correlation value calculation unit is connected with the external wireless network parameter subsystem through the external data and control bus, and connected with the preset parameter unit and the correlation result unit through the internal data and control bus, and is used to receive the output of the wireless network parameter measurement subsystem For the measurement data, the correlation value calculation of the preset transmitter ID and the measured transmitter ID is performed, and the correlation value calculation result data is output to the correlation value result unit for storage. This unit actually corresponds to a hardware chip composed of input and output logic and correlation value calculation logic. The preset transmitter identifier is read from the preset parameter unit, and the measured transmitter identifier is obtained by parsing from the measurement data input interface. The correlation value calculation result data at least includes: a measured transmitter ID, a preset transmitter ID that has the same correlation value as the measured transmitter ID, and a corresponding correlation value.

A total of 256 transmitter identifiers can be set in the CMMB wireless network system, and the correlation calculation value of the i-th transmitter identifier is set to R _i , and the transmitter identifier signal obtained in this measurement is m, and m is a one-dimensional vector. The CMMB standard The transmitter ID specified in , that is, the preset transmitter ID is s, and s is also a one-dimensional vector, then:

${\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; \&CircleTimes;</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; ij</span>}}<span\; class="notranslate">\; )</span>$

Wherein, i is the sequence number used to identify the transmitter ID defined in the CMMB wireless network system, 0≦i≦255, and j represents the bit position in the transmitter ID defined in the CMMB standard 0≦j≦255.

The correlation value result unit is connected with the correlation value calculation unit, the identification unit and the time calculation unit through the data and control bus, and is used for buffering the correlation value calculation result data sent by the correlation value calculation unit. This unit may actually correspond to a storage medium, such as a random access memory RAM.

Assume that 256 transmitter identities are preset in the preset parameter unit, but since the transmitter identities in CMMB are not all orthogonal sequences, there are autocorrelations of multiple transmitter identities in the preset transmitter identities In the case of the same autocorrelation value, the measured transmitter identity calculated by the correlation value calculation unit is completely the same as the correlation value calculation result of the preset transmitter identity with the same autocorrelation value or within the preset deviation range (for The expression is concise, and the present invention is collectively referred to as the same correlation value), so that it is impossible to distinguish which one of the preset transmitter identities with the same autocorrelation value corresponds to the measured transmitter identities. Of course, if the correlation values between the measured transmitter ID and each preset transmitter ID are different (or are not within the preset deviation range), the preset reflector ID with the highest correlation can be directly determined Identifies the transmitter being measured. The present invention solves the above-mentioned problem that the identity of the transmitter under measurement cannot be identified under the same correlation value by combining the time calculation unit and the identification unit with the geographic location information of the transmitter and the receiver.

The time calculation unit is connected with the wireless network parameter subsystem through the external data and control bus, and connected with the preset parameter unit, the correlation value result unit and the identification unit through the internal data and control bus. For calculating the signals of the preset transmitter identities in the correlation value result data that are the same as the correlation value calculation results of the measured transmitter identities, the signals of the preset transmitter identities arriving at the position of the receiver from the preset positions Time of Arrival, and the measured time of arrival of the transmitter identification signal.

The time calculation unit further includes a first calculation unit and a second calculation unit, and the first calculation unit is used to acquire the preset emission in the correlation value result data that is the same as the correlation value calculation result of the measured transmitter identification from the correlation value result unit According to the preset transmitter identifier read from the correlation value result unit, the transmitter parameters and geographic location information corresponding to the preset transmitter identifier are read from the preset parameter unit, and then according to the geographical location of the receiver Position information, calculating the signal arrival time of each preset transmitter identification signal from the preset position to the receiver location, and outputting the calculated arrival time of each preset transmitter identification signal to the identification unit. This unit can actually be realized by input and output logic and calculation logic chips.

The second calculation unit in the time calculation unit is used to obtain the measured arrival time of the transmitter identification signal according to the measurement data obtained from the external wireless network parameter subsystem. The measured arrival time of the transmitter identification signal is calculated according to the transmission parameters of the wireless transmission channel corresponding to the measured transmitter identification signal, such as transmission frequency, etc., to calculate the measured transmitter signal corresponding to the transmitter identification from the transmitter to The time used by the receiver, or calculated according to the difference between the signal transmission time carried in the wireless transmission channel and the time when the receiver receives the signal. Each measured transmitter ID and its corresponding signal arrival time of the measured transmitter ID to the receiver are stored in this unit. This unit can actually be realized by input and output logic and calculation logic chips.

The acquisition of the arrival time of the preset transmitter identification signal specifically includes: first calculating the signal transmission distance according to the geographic location in the preset transmitter parameters and the current location of the receiver, and then according to the parameters such as the signal transmission frequency in the preset transmitter parameters The preset transmitter arrival time of the preset transmitter identification signal from the preset position to the current position of the receiver is calculated by simulation.

The current location of the receiver can be preset into the time calculation unit or preset parameter unit by the surveyor before the measurement, and can also be obtained in real time. The time calculation unit can obtain the current geographic location information of the receiver from an external geographic location information system through a built-in positioning module of the device or through a data interface. The positioning module may be a GPS terminal module of the Global Positioning System, a terminal positioning module of the China Beidou Global Positioning System, etc., and the geographic location information system may be a map navigation system with positioning and navigation functions.

The identification unit is connected with the correlation value result unit and the time calculation unit through the data and control bus, and is used to identify the actual corresponding preset time of the measured transmitter identification signal according to the measured arrival time of the transmitter identification signal and the preset arrival time of the transmitter identification signal. Set the transmitter ID, identify the preset transmitter ID with the closest arrival time as the transmitter ID actually corresponding to the measured transmitter ID, and output the identified transmitter ID; when the measured transmitter ID and each preset In the case that the correlation values of the transmitter identifiers are not the same (or are not within the preset deviation range), the unit will identify the preset transmitter identifier with the highest correlation in the correlation value calculation result data as the measured emission The transmitter ID actually corresponds to the transmitter ID, and outputs the identified transmitter ID. This unit can be realized by input and output logic and comparator.

In the case of the same correlation value, the identification method is specifically: the signal arrival time of each preset transmitter identification signal obtained by the simulation calculation of the time calculation unit to the current location of the receiver and the measured arrival time stored in the correlation value result unit The signal arrival times of the transmitter identities are compared one by one, and the two transmitter identities with the same time or the closest time are the actual corresponding transmitter identities. The corresponding relationship between all the transmitter identifiers measured at the current measurement position and the preset transmitter identifiers is determined one by one through the above judging method.

Example 1

In this embodiment, the measured transmitter identification number in the correlation value result unit is smaller than the preset transmitter identification number in the preset parameter unit. It is assumed that three transmitters A, B, C and their geographic location information have been preset in the preset parameter unit, and the autocorrelation values of the three transmitters A, B, and C are the same.

Figure 4 is a schematic diagram illustrating the arrival time and amplitude of two transmitter signals measured at the current measurement position. The abscissa is the time axis, and the ordinate is the signal amplitude. After calculation by the correlation value calculation unit, it is found that there are two The measured transmitter identities have the same correlation with the 3 preset transmitter identities in the preset parameter unit, so it is impossible to distinguish which two transmitters the measured 2 transmitter identities are based on the correlation value.

The time calculation unit calculates the signal arrival time of the preset transmitter identification signal arriving at the measurement position according to the preset geographic location information of the three preset transmitter identifiers with the same correlation value and the geographic location information of the current receiver. Figure 5 illustrates the positional relationship between three transmitters A, B, C and the current measurement position, T _A is the preset transmitter where the identification signal of the preset transmitter A arrives at the position of the receiver from the preset position, that is, the current measurement position A marks the arrival time of the signal, T _B presets the signal arrival time of the signal of transmitter B from the preset position to the position of the receiver, which is the current measurement position, and presets the time of arrival of the signal of signal B of the preset transmitter, T _C presets the signal of signal of transmitter C The preset transmitter C identifies the signal arrival time from the preset position to the position where the receiver is located, that is, the current measurement position. Figure 6 is a schematic diagram of the arrival time and amplitude of the signals of the three transmitters A, B, and C preset in the preset parameter unit, because the measurement position is closer to the transmitter B, so the signal of the transmitter B arrives at the measurement position first , the measurement location is the farthest from transmitter C, so the signal from transmitter C arrives at the measurement location at the latest.

The identification unit judges which two of the three preset transmitters A, B, and C the measured transmitter identifier is based on the calculation result of the time calculation unit and the correlation value calculation result of the correlation value result unit.

The recognition unit compares the time when the two measured transmitter signals arrive at the measurement position in the correlation value result unit one by one and the time when the signals of the three transmitters A, B, and C arrive at the measurement position calculated by the time calculation unit, and the time when the signals of the transmitter B arrive at the measurement position. The arrival time of the signal at the measurement position is the same as or closest to the measured time when the first transmitter signal arrives at the measurement position, and the arrival time of the signal of transmitter A is consistent with the measured time when the second transmitter signal arrives at the measurement position or the closest, so it is determined that the first transmitter ID measured is transmitter B, and the second transmitter ID measured is transmitter A. Since the transmitter C is far away and the power attenuation is relatively large, the signal reaching the receiver is lower than the measurement threshold of the receiver, so it cannot be detected. Figure 7 shows the final identification of the identified transmitter and the time delay of the signal arriving at the receiver.

Example 2

In this embodiment, the measured transmitter identification number in the correlation value result unit is equal to the preset transmitter identification number in the preset parameter unit. It is assumed that three transmitters A, B, C and their geographic location information have been preset in the preset parameter unit, and the autocorrelation values of the three transmitters A, B, and C are the same. The positional relationship of the three transmitters A, B, and C is shown in Figure 5;

Figure 8 is a schematic diagram of the arrival time and amplitude of the three transmitter signals measured at the current measurement position. After calculation by the correlation value calculation unit, it is found that there are 3 measured transmitter identifiers and 3 preset values in the preset parameter unit. The correlation of the set transmitter identity is the same.

The time calculation unit calculates the time when the signal arrives at each transmitter position in the preset parameter unit according to the current measurement position, and obtains the relationship diagram of signal amplitude and time as shown in Figure 9, T _A is the identification signal of the preset transmitter A from the preset The arrival time of the identification signal of the preset transmitter A at the position where the receiver is located, that is, the current measurement position, T _B The identification signal of the preset transmitter B arrives at the position where the receiver is located, that is, the preset transmitter at the current measurement position B identifies the arrival time of the signal, T _C presets the signal arrival time of the preset transmitter C when the identification signal of the transmitter C arrives at the position of the receiver from the preset position, that is, the current measurement position. Because the measurement location is closer to transmitter B, the signal from transmitter B arrives at the measurement location first, and the measurement location is farthest from transmitter C, so the signal from transmitter C arrives at the measurement location the latest.

The recognition unit compares the time when the three measured transmitter identification signals in the correlation value result unit arrive at the measurement position and the time when the signals of the three transmitters A, B and C arrive at the measurement position calculated by the time calculation unit. The time when the signal of B arrives at the measurement position is the same as or closest to the measured time when the signal of the first transmitter arrives at the measurement position. The time is the same or the closest. The time when the signal of transmitter C arrives at the measurement position is the same as or the closest to the time when the signal of the third transmitter arrives at the measurement position. Therefore, it is determined that the first transmitter ID measured is the transmitter B, the measured second transmitter identity is transmitter A, and the measured third transmitter identity is transmitter C.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (7)

1. a kind of identification method of transmitter mark in CMMB network, it is characterized in that, the method comprises: Preset transmitter identification, transmitter geographic location information and transmitter parameters of all CMMB transmitters in the tested area; Receive the measurement data, execute the correlation value calculation between the preset transmitter ID and the measured transmitter ID, and obtain the arrival time of the measured transmitter ID signal; According to the geographical location of the preset transmitter, the current location of the receiver and the parameters of the transmitter, calculate the calculation results of each preset transmitter identification signal that is the same as the correlation value calculation result of the measured transmitter identification to arrive at the current location of the receiver from the preset position The time of arrival of the preset transmitter identification signal at the location; According to the measured transmitter identification signal arrival time and the preset transmitter identification signal arrival time, identify the preset transmitter identification actually corresponding to the measured transmitter identification, and identify the preset transmitter identification with the closest arrival time as The transmitter identity to which the measured transmitter identity actually corresponds. 2. The method according to claim 1, wherein the method for obtaining the measured arrival time of the transmitter identification signal is specifically: According to the transmission parameters of the wireless transmission channel corresponding to the measured transmitter identification signal, calculate the time taken by the transmitter signal corresponding to the measured transmitter identification signal from the transmitter to the receiver, or transmit the signal according to the signal carried in the wireless transmission channel Calculated as the difference between the time and the time at which the signal was received by the receiver. 3. The method of claim 1, wherein, The receiver's current geographic location information is obtained from an external geographic location information system through a built-in positioning module or through a data interface. 4. a kind of identifying device of transmitter mark in CMMB network, it is characterized in that, this device comprises: The preset parameter unit is used to store all CMMB transmitter identifications, transmitter geographic location information and transmitter parameters in the measured area; The correlation value calculation unit is connected with the external wireless network parameter subsystem and the internal preset parameter unit, and is used to perform the correlation value calculation between the preset transmitter identification and the measured transmitter identification, and output the correlation value calculation result data to the relevant value result unit; A correlation value result unit, configured to cache the correlation value calculation result data; the correlation value calculation result data at least includes: the measured transmitter identification, the preset transmitter whose correlation value is the same as the measured transmitter identification Machine ID and corresponding related values; The time calculation unit is connected with the external wireless network parameter subsystem, the preset parameter participation and the correlation value result unit, and is used to calculate each preset in the correlation value result data that is the same as the correlation value calculation result of the measured transmitter identification The signal arrival time of each preset transmitter identification signal from the preset position to the receiver location, and the measured arrival time of the transmitter identification signal; The identification unit is connected with the correlation value result unit and the time calculation unit, and is used to identify the preset transmitter actually corresponding to the measured transmitter ID according to the measured transmitter ID signal arrival time and the preset transmitter ID signal arrival time. Transmitter ID, outputs the identified transmitter ID. 5. The device according to claim 4, wherein the time calculation unit comprises: The first calculation unit is connected with the preset parameter unit and the correlation value result unit, and is used to calculate the correlation value calculation result of each preset transmitter identification that is the same as the correlation value calculation result of the measured transmitter identification in the correlation value result data The signal arrives at each preset transmitter at the location of the receiver from the preset position to identify the arrival time of the signal, and output the calculation result to the identification unit; The second calculation unit is connected with the external wireless network parameter subsystem, and is used for calculating the arrival time of the measured transmitter identification signal, and outputting the calculation result to the identification unit. 6 . The device according to claim 4 , further comprising a positioning module, the positioning module outputs the geographic location information of the receiver to the time calculation unit. 7 . 7. The device according to claim 4, wherein the time calculation unit is also connected to an external geographic location information system, and obtains the current measurement position, that is, the geographic location information of the receiver, from the external geographic location information system through a data interface .

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