Beidou positioning and short message communication fusion terminal anti-interference method and fusion terminal

Abstract

The invention relates to the technical field of signal anti-interference, in particular to a Beidou positioning and short message communication fusion terminal anti-interference method and a fusion terminal. The method comprises the following steps: performing signal discrete processing and fast Fourier transform on received Beidou channel data to obtain intermediate signal data; performing interference detection on the intermediate signal data by using a hidden Markov model to obtain an interference judgment result; and when the interference judgment result is that interference exists and a Beidou transmitting indication signal is received, performing signal filtering and inverse fast Fourier transform on the intermediate signal data to obtain Beidou signal data after interference filtering. According to the invention, interference signals can be filtered while effective signals are reserved.

Description

Technical Field

[0001] The present application relates to the technical field of signal anti-interference, and in particular to an anti-interference method for a Beidou positioning and short message communication fusion terminal and a fusion terminal. Background Art

[0002] At present, there are more and more scenarios in which Beidou high-precision positioning and short message communication are used together. When short messages are transmitted, because the frequency of the transmitting signal 1615MHz is close to the frequency of the Beidou positioning B1 signal, the Beidou high-precision positioning will be interfered with, causing temporary positioning failure or positioning deviation.

[0003] Related technologies usually use frequency domain algorithms to deal with the above problems, such as adaptive algorithms. Its specific working mode is that the front-stage interference detection module integrates the power on each frequency component. When there is an interference signal on a certain frequency component, its energy integral will exceed the set threshold. The interference detection module outputs an interference signal flag, and the transmission function forms a zero trap on the frequency component. The interference signal and the useful signal on the frequency component are filtered out at the same time. Therefore, a notch is formed only when the signal energy exceeds the interference threshold. When the signal energy does not exceed the interference threshold, it is difficult to effectively filter out the interference signal. Summary of the invention

[0004] In order to solve the problem that it is difficult to filter out interference signals while retaining valid signals in the prior art, the present application provides an anti-interference method for a Beidou positioning and short message communication fusion terminal and a fusion terminal.

[0005] In the first aspect, the present application provides a Beidou positioning and short message communication fusion terminal anti-interference method, which adopts the following technical solution: A Beidou positioning and short message communication fusion terminal anti-interference method, comprising: By adopting the above technical solutions, signal discrete processing, fast Fourier transform (FFT) and hidden Markov model (HMM) interference detection are used to effectively identify interference signals in Beidou channel data. When interference is detected, the interference frequency is filtered out through weight adjustment and inverse fast Fourier transform (IFFT), thereby restoring pure Beidou signal data, significantly suppressing the interference of short message transmission signals on Beidou positioning signals, avoiding temporary positioning failure or deviation, and at the same time ensuring the integrity and positioning accuracy of Beidou signals through frequency domain filtering and weight recovery mechanism, thereby improving the system's anti-interference ability and reliability.

[0006] In a preferred example, the present application may be further configured as follows: when the interference determination result is that interference exists, and when a Beidou transmission indication signal is received, signal filtering and inverse fast Fourier transform are performed on the intermediate signal data, including: When the interference determination result is that interference exists and a Beidou transmission indication signal is received, the weight of the intermediate signal data is reset to 0; When a preset extended time has passed after receiving the Beidou transmission indication signal, the weight of the intermediate signal data is reset to 1.

[0007] By adopting the above technical solution, based on the dynamic weight adjustment mechanism, when interference is detected and the Beidou transmission indication signal is received, the weight of the interfered intermediate signal data is reset to 0, thereby effectively filtering out the interference frequency and avoiding the influence of the interference signal on the Beidou positioning signal; after the short message transmission is completed, the weight is reset to 1 after a preset extension time, and the original signal data is restored to ensure the integrity of the Beidou signal.

[0008] In a preferred example, the present application can be further configured as follows: the expression of the Beidou channel data is: ; in, For Beidou signal, ; Indicates the Beidou signal power, Indicates data signal, represents the carrier signal, Indicates the Beidou signal phase, represents phase shift; is the interference signal, ; represents the interference signal power, represents the interference signal phase, represents phase shift; is Gaussian noise.

[0009] By adopting the above technical solution, the expression of Beidou channel data clearly describes the signal composition, in which Beidou signal and interference signal are modeled by parameters such as power, phase and frequency offset respectively. Through this expression, the characteristics of Beidou signal and interference signal can be accurately analyzed.

[0010] In a preferred example, the present application can be further configured as follows: the construction process of the hidden Markov model includes: Define the probability matrix ; in, represents the order of the interfering subband signal in the intermediate signal data, , Indicates when In Status In The probability of Indicates that there is no interference. Indicates interference; when The minimum error probability of order interference is not less than When , the hidden Markov model outputs an interference determination result indicating the presence of interference.

[0011] By adopting the above technical solution, the hidden Markov model (HMM) can effectively model the dynamic change process of the interference subband signal by defining the state transition probability matrix. By calculating the state transition probability and the minimum error probability, the HMM can accurately identify the interference state in the intermediate signal data.

[0012] In the second aspect, the present application provides a Beidou positioning and short message communication fusion terminal, which adopts the following technical solution: A Beidou positioning and short message communication fusion terminal, comprising: a Beidou positioning module, a short message communication module, a power supply and a processing module; The processing module includes: at least one processor, a memory and at least one application, wherein the at least one application is stored in the memory and configured to be executed by the at least one processor, and the at least one application is configured to: execute the Beidou positioning and short message communication fusion terminal anti-interference method as described in any one of the first aspects.

[0013] In a preferred example, the present application can be further configured as follows: the power supply is connected to the Beidou positioning module and the short message communication module in a star-shaped manner.

[0014] By adopting the above technical solution, the power supply is connected to the Beidou positioning module and the short message communication module in a star manner, which can effectively reduce the power supply interference between the modules and ensure the independence and stability of the power supply.

[0015] In a preferred example, the present application can be further configured as follows: the signal interface distance between the Beidou positioning module and the short message communication module is not less than a preset distance, and the preset distance is determined according to the sizes of the Beidou positioning module and the short message communication module.

[0016] By adopting the above technical solution, physical isolation is used to reduce the interference of the short message communication module's transmitting signal on the Beidou positioning module's receiving signal.

[0017] In a preferred example, the present application can be further configured as follows: the Beidou positioning module and the short message communication module are each wrapped with a metal shielding cover.

[0018] By adopting the above technical solution, metal shielding covers are respectively provided for the Beidou positioning module and the short message communication module, which can effectively isolate the electromagnetic interference between the modules.

[0019] In a preferred example, the present application can be further configured as follows: the size of the power supply laying of the Beidou positioning module is consistent with the size of the metal shielding cover wrapped around the Beidou positioning module.

[0020] By adopting the above technical solution, the physical matching between the power supply line and the shielding cover can be ensured, and the interference of the power supply line on the shielding effect can be reduced.

[0021] In summary, this application includes the following beneficial technical effects: This application utilizes signal discrete processing, fast Fourier transform (FFT) and hidden Markov model (HMM) interference detection to effectively identify interference signals in Beidou channel data, and when interference is detected, it filters out interference frequencies through weight adjustment and inverse fast Fourier transform (IFFT), thereby restoring pure Beidou signal data, significantly suppressing the interference of short message transmission signals on Beidou positioning signals, avoiding temporary positioning failure or deviation, and at the same time ensuring the integrity and positioning accuracy of Beidou signals through frequency domain filtering and weight recovery mechanisms, thereby improving the system's anti-interference capability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flowchart of a Beidou positioning and short message communication fusion terminal anti-interference method provided in an embodiment of the present application; Figure 2 It is a schematic diagram of FFT processing provided by an embodiment of the present application; Figure 3 It is a flow chart of an algorithm for detecting interference based on the HMM algorithm and Beidou transmission combined with the embodiment of the present application; Figure 4 It is a structural diagram of a processing module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1 -Attached Figure 4 This application is described in further detail.

[0024] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally means that the associated objects before and after are in an "or" relationship.

[0027] It should be noted that in the optional embodiments of the present application, the object information and other related data involved, when the embodiments in the present application are applied to specific products or technologies, need to obtain the permission or consent of the object, and the collection, use and processing of the relevant data need to comply with the relevant laws, regulations and standards of the relevant countries and regions. In other words, if the embodiments of the present application involve data related to the object, it needs to be obtained with the authorization and consent of the object, the authorization and consent of the relevant departments, and in compliance with the relevant laws, regulations and standards of the country and region. If personal information is involved in the embodiments, the acquisition of all personal information needs to obtain the consent of the individual. If sensitive information is involved, the separate consent of the information subject needs to be obtained. The embodiments also need to be implemented with the authorization and consent of the object.

[0028] The present application embodiment provides a Beidou positioning and short message communication fusion terminal anti-interference method, such as Figure 1 As shown, the method provided in the embodiment of the present application is applied to the Beidou positioning and short message communication fusion terminal, and is executed by a processing module set on the fusion terminal. The method includes steps S101 to S103, wherein: S101. Perform signal discrete processing and fast Fourier transform (FFT) on the received Beidou channel data to obtain intermediate signal data.

[0029] Specifically, the Beidou channel data is the received data, including Beidou signal, interference signal and Gaussian noise. The Beidou signal is a valid signal, and the interference signal is an interference signal generated by short message communication. The Beidou channel data is a continuous signal. The Beidou channel data is sampled and converted into a discrete time signal. The discrete time signal is processed by FFT, and the time domain signal is converted into a frequency domain signal to obtain the intermediate signal data.

[0030] S102. Perform interference detection on the intermediate signal data using a Hidden Markov Model (HMM) to obtain an interference determination result.

[0031] Specifically, the intermediate signal data is input into the HMM, and the interference determination result output by the HMM is received, and the interference determination result is the presence or absence of interference. When the interference determination result is that there is no interference, no subsequent filtering is performed, and the intermediate signal data is directly subjected to an inverse fast Fourier transform (IFFT) to obtain the Beidou signal data.

[0032] S103: When the interference determination result is that interference exists and a Beidou transmission indication signal is received, signal filtering and inverse fast Fourier transform are performed on the intermediate signal data to obtain Beidou signal data after the interference is filtered out.

[0033] Specifically, the Beidou transmission indication signal is an internal signal used to indicate that the Beidou positioning module or the short message communication module is about to transmit the Beidou signal. When interference is detected and the Beidou transmission indication signal is received, it means that there is interference in the current Beidou channel data, which will interfere with the Beidou signal to be transmitted. Therefore, the intermediate signal data is filtered to filter out the interference, and then IFFT processing is performed to obtain the restored Beidou signal data.

[0034] See also Figure 2 , which shows a schematic diagram of FFT processing provided by an embodiment of the present application. S / P means converting the signal data from serial to parallel, using multiple channels to improve the efficiency of signal transmission and processing, and then performing FFT processing on the discrete time signal to obtain intermediate signal data, and inputting the intermediate signal data into the HMM to obtain the interference determination result. When the interference determination result is that interference exists, the intermediate signal data is subjected to signal filtering and IFFT to obtain Beidou signal data, and the obtained Beidou signal data is converted from parallel to serial (P / S).

[0035] This embodiment utilizes signal discrete processing, fast Fourier transform (FFT) and hidden Markov model (HMM) interference detection to effectively identify interference signals in Beidou channel data, and when interference is detected, it filters out interference frequencies through weight adjustment and inverse fast Fourier transform (IFFT), thereby restoring pure Beidou signal data, significantly suppressing the interference of short message transmission signals on Beidou positioning signals, avoiding temporary positioning failure or deviation, and at the same time ensuring the integrity and positioning accuracy of Beidou signals through frequency domain filtering and weight recovery mechanisms, thereby improving the system's anti-interference capability and reliability.

[0036] In a possible implementation of the embodiment of the present application, the expression of Beidou channel data is: ; in, For Beidou signal, ; Indicates the Beidou signal power, Indicates data signal, represents the carrier signal, Indicates the Beidou signal phase, represents phase shift; is the interference signal, ; represents the interference signal power, represents the interference signal phase, represents phase shift; is Gaussian noise.

[0037] Furthermore, assuming that the interference signal is a bandwidth signal composed of multiple sub-bands, ; , k=0,1,…,K-1, indicating that there are K interfering sub-band signals.

[0038] The signal discrete processing of Beidou channel data, the discrete time sampling model is expressed as: .

[0039] in, Indicates Beidou signal. .

[0040] represents the interference signal, .

[0041] represents Gaussian white noise, .

[0042] Furthermore, after the signal is discretely processed Perform FFT processing to obtain intermediate signal data.

[0043] This embodiment clearly describes the signal composition through the expression of Beidou channel data, wherein the Beidou signal and the interference signal are modeled by parameters such as power, phase and frequency offset respectively. Through this expression, the characteristics of the Beidou signal and the interference signal can be accurately analyzed.

[0044] A possible implementation of the embodiment of the present application is a process of constructing a hidden Markov model, including: Define the probability matrix ; in, represents the order of the interfering subband signal in the intermediate signal data, , Indicates when In Status In The probability of Indicates that there is no interference. Indicates interference; when The minimum error probability of order interference is not less than When , the hidden Markov model outputs an interference determination result indicating the presence of interference.

[0045] In this embodiment, based on the fact that interference is independent at different frequencies, it is assumed that the interference model is a discrete first-order Markov chain , represents the non-interfering term, Represents the presence of interference; probability matrix Expressed as .

[0046] Since interference is independent of frequency, frequency domain adaptive estimation using HMM estimation can detect and estimate interference, and the output of HMM can determine whether the subsequent anti-interference algorithm is used.

[0047] Detection The minimum error probability of order interference is expressed as: .

[0048] This embodiment can effectively model the dynamic change process of the interference subband signal by defining a state transition probability matrix through a hidden Markov model (HMM). By calculating the state transition probability and the minimum error probability, the HMM can accurately identify the interference state in the intermediate signal data.

[0049] A possible implementation of the embodiment of the present application is that when the interference determination result is that interference exists and a Beidou transmission indication signal is received, signal filtering and inverse fast Fourier transform are performed on the intermediate signal data, including: When the interference determination result is that interference exists and the Beidou transmission indication signal is received, the weight of the intermediate signal data is reset to 0; When a preset extension time has passed after receiving the Beidou transmission indication signal, the weight of the intermediate signal data is reset to 1.

[0050] See also Figure 3 , which shows the algorithm flow chart of the present application based on HMM algorithm and Beidou transmission combined with interference detection. The Beidou channel data is processed in turn for signal discreteness ( Figure 3The obtained intermediate signal data is then passed into the HMM, and the interference determination result is obtained by using the HMM algorithm. When the interference determination result is that interference exists and a Beidou transmission indication signal is received, the intermediate signal data is subjected to signal filtering and IFFT processing to obtain Beidou signal data.

[0051] Among them, the filtering process is an anti-interference algorithm, which completely filters out the interference signal by resetting the weight of the interfered signal to 0, avoiding interference with the Beidou signal to be transmitted. After the preset extension time, the interference disappears and the weight is restored to 1 to ensure signal integrity, thereby suppressing the interference signal amplitude in the segment between signal transmissions. Among them, the preset extension time can be set according to the actual signal transmission situation, and this embodiment is not limited.

[0052] This embodiment is based on a dynamic weight adjustment mechanism. When interference is detected and a Beidou transmission indication signal is received, the weight of the interfered intermediate signal data is reset to 0, thereby effectively filtering out the interference frequency and avoiding the influence of the interference signal on the Beidou positioning signal; after the short message transmission is completed, the weight is reset to 1 after a preset extension time, and the original signal data is restored to ensure the integrity of the Beidou signal.

[0053] The above embodiment introduces a Beidou positioning and short message communication fusion terminal anti-interference method from the perspective of method flow, and the following embodiment introduces a Beidou positioning and short message communication fusion terminal from the perspective of the terminal. For details, please refer to the following embodiment.

[0054] An embodiment of the present application provides a Beidou positioning and short message communication fusion terminal, and the device may include: a Beidou positioning module, a short message communication module, a power supply and a processing module.

[0055] In a preferred example, the present application can be further configured as follows: the power supply is connected to the Beidou positioning module and the short message communication module in a star-shaped manner.

[0056] Specifically, in the design of power supply and ground, the power supply is transmitted to the Beidou positioning module and the short message communication module in a star-shaped manner, and 10uF, 1uF and 0.1uf capacitors are used to filter out the module power input signal. The power supply is connected to the Beidou positioning module and the short message communication module in a star-shaped manner, which can effectively reduce the power supply interference between the modules and ensure the independence and stability of the power supply.

[0057] In a preferred example, the present application can be further configured as follows: the signal interface distance between the Beidou positioning module and the short message communication module is not less than a preset distance, and the preset distance is determined according to the sizes of the Beidou positioning module and the short message communication module.

[0058] When merging the terminal layout, keep the mutually interfering parts of the Beidou positioning module and the short message communication module as far away as possible, that is, the signal interface distance of the mutually interfering parts is the farthest. Optionally, after determining the size of the Beidou positioning module and the short message communication module, the distance between any point on the Beidou positioning module and any point on the short message communication module can be selected as the signal interface to maximize the distance. Use physical isolation to reduce the interference of the short message communication module's transmission signal on the Beidou positioning module's reception signal.

[0059] In a preferred example, the present application can be further configured as follows: the Beidou positioning module and the short message communication module are each wrapped with a metal shielding cover to shield the signal, thereby effectively isolating the electromagnetic interference between the modules.

[0060] In a preferred example, the present application can be further configured as follows: in the design of the PCB board, the power laying size of the Beidou positioning module is consistent with the size of the metal shielding cover wrapped on the Beidou positioning module, which can ensure the physical match between the power line and the shielding cover, reduce the interference of the power line on the shielding effect, and minimize the impact of the interference signal emitted by the short message communication module.

[0061] The embodiment of the present application adopts a combination of software and hardware. In the software solution process, the B1 signal data is removed during the transmission process to eliminate the generation of interference data, including resetting the weight of the B1 signal in the positioning settlement to 0 within a period of time after the transmission, eliminating the positioning deviation caused by the B1 signal. Through low-cost hardware shielding cover and structural layout, the signal interference is minimized, and the Beidou positioning part and the short message part are physically isolated, including shielding cover isolation and PCB isolation design. Since the satellite navigation signal adopts CDMA spread spectrum modulation, the energy loss in a smaller range in the frequency domain can be demodulated through the correlation between each frequency component during the demodulation process, and the data information contained therein is not lost. This principle can be used to achieve anti-interference processing of the input signal in the digital intermediate frequency domain.

[0062] In the embodiment of the present application, a processing module is provided, such as Figure 4 As shown, Figure 4 The processing module 400 shown includes: a processor 401 and a memory 403. The processor 401 and the memory 403 are connected, such as through a bus 402. Optionally, the processing module 400 may also include a transceiver 404. It should be noted that in actual applications, the transceiver 404 is not limited to one, and the structure of the processing module 400 does not constitute a limitation on the embodiments of the present application.

[0063] Processor 401 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. Processor 401 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0064] The bus 402 may include a path to transmit information between the above components. The bus 402 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 402 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but it does not mean that there is only one bus or only one type of bus.

[0065] The memory 403 may be a ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory) or other types of dynamic storage devices that can store information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical disk storage, optical disk storage (including compressed optical disk, laser disk, optical disk, digital versatile disk, Blu-ray disk, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0066] The memory 403 is used to store the application code for executing the solution of the present application, and is controlled to execute by the processor 401. The processor 401 is used to execute the application code stored in the memory 403 to implement the contents shown in the embodiment of the anti-interference method for the Beidou positioning and short message communication fusion terminal.

[0067] Figure 4 The processing module shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0068] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0069] The above are only some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A Beidou positioning and short message communication fusion terminal anti-interference method, characterized in that: Applied to Beidou positioning and short message communication fusion terminal; the method includes: Perform signal discrete processing and fast Fourier transform on the received Beidou channel data to obtain intermediate signal data; Performing interference detection on the intermediate signal data using a hidden Markov model to obtain an interference determination result; When the interference determination result is that interference exists and a Beidou transmission indication signal is received, signal filtering and inverse fast Fourier transform are performed on the intermediate signal data to obtain Beidou signal data after interference is filtered out.

2. The Beidou positioning and short message communication fusion terminal anti-interference method according to claim 1 is characterized in that: When the interference determination result is that interference exists and a Beidou transmission indication signal is received, signal filtering and inverse fast Fourier transform are performed on the intermediate signal data, including: When the interference determination result is that interference exists and a Beidou transmission indication signal is received, the weight of the intermediate signal data is reset to 0; When a preset extended time has passed after receiving the Beidou transmission indication signal, the weight of the intermediate signal data is reset to 1.

3. The Beidou positioning and short message communication fusion terminal anti-interference method according to claim 1 is characterized in that: The expression of the Beidou channel data is: ； in, For Beidou signal, ; Indicates the Beidou signal power, Indicates data signal, represents the carrier signal, Indicates the Beidou signal phase, represents phase shift; is the interference signal, ; represents the interference signal power, represents the interference signal phase, represents phase shift; is Gaussian noise.

4. The Beidou positioning and short message communication fusion terminal anti-interference method according to claim 1 is characterized in that: The construction process of the hidden Markov model includes: Define the probability matrix ; in, represents the order of the interfering subband signal in the intermediate signal data, , Indicates when In Status In The probability of Indicates that there is no interference. Indicates interference; when The minimum error probability of order interference is not less than When , the hidden Markov model outputs an interference determination result indicating the presence of interference.

5. A Beidou positioning and short message communication fusion terminal, characterized in that: include: Beidou positioning module, short message communication module, power supply and processing module; The processing module includes: at least one processor, a memory and at least one application, wherein the at least one application is stored in the memory and configured to be executed by the at least one processor, and the at least one application is configured to: execute the Beidou positioning and short message communication fusion terminal anti-interference method described in any one of claims 1-4.

6. The Beidou positioning and short message communication fusion terminal according to claim 5, characterized in that: The power supply is connected to the Beidou positioning module and the short message communication module in a star-shaped manner.

7. The Beidou positioning and short message communication fusion terminal according to claim 5, characterized in that: The signal interface distance between the Beidou positioning module and the short message communication module is not less than a preset distance, and the preset distance is determined according to the sizes of the Beidou positioning module and the short message communication module.

8. The Beidou positioning and short message communication fusion terminal according to claim 5, characterized in that: The Beidou positioning module and the short message communication module are each wrapped with a metal shielding cover.

9. The Beidou positioning and short message communication fusion terminal according to claim 5, characterized in that: The laying size of the Beidou positioning module power supply is consistent with the size of the metal shielding cover wrapped on the Beidou positioning module.

Images