Beidou short message interference suppression method and device, computer device and storage medium

Abstract

The application discloses a Beidou short message interference suppression method and device, computer equipment and a storage medium, which are used for suppressing the interference of a Beidou short message signal on an airborne GPS receiver. The main technical scheme is as follows: determining whether an airborne global positioning system (GPS) received signal is interfered by a Beidou short message signal; if the airborne GPS received signal is interfered by the Beidou short message signal, performing wavelet packet transformation on the airborne GPS time domain signal interfered by the Beidou short message signal to obtain wavelet packet coefficients; performing suppression processing on the wavelet packet coefficients, wherein the suppression processing is to set the coefficients with absolute values higher than a wavelet packet coefficient threshold to preset values; and performing inverse wavelet packet transformation on the wavelet packet coefficients subjected to the suppression processing to obtain a time domain signal of the airborne GPS received signal after suppression of the Beidou short message interference signal.

Description

Technical Field

[0001] The present invention relates to the field of satellite navigation technology, and in particular to a Beidou short message interference suppression method, device, computer equipment and storage medium. Background Art

[0002] Beidou short messages are a unique feature of the Beidou satellite navigation system. They offer two-way communication, providing global and regional short message communications. Regional communication capacity reaches 14,000 bits (1,000 Chinese characters) per message, enabling the transmission of text, voice, and images. Global communication capacity is 560 bits (40 Chinese characters) per message. This feature is crucial for ensuring civil aviation safety.

[0003] However, the Global Positioning System (GPS) receiver's L1 frequency is 1575.42 MHz, while the BeiDou short message uplink frequency is 1610-1626.5 MHz. Due to the close frequency proximity, there is a risk that the onboard BeiDou short message transceiver could interfere with the GPS receiver during BeiDou short message transmission, rendering GPS positioning unavailable during BeiDou short message transmissions. Therefore, interference suppression methods are required to suppress BeiDou short message transmissions within the GPS receiver. Summary of the Invention

[0004] The present invention provides a Beidou short message interference suppression method, device, computer equipment and storage medium, which are used to suppress the interference of Beidou short message signals on airborne GPS receivers.

[0005] An embodiment of the present invention provides a Beidou short message interference suppression method, the method comprising:

[0006] Determine whether the GPS receiving signal of the airborne global positioning system is interfered with by the Beidou short message signal;

[0007] If the airborne GPS time domain signal is interfered by the Beidou short message signal, wavelet packet transform is performed on the airborne GPS time domain signal interfered by the Beidou short message signal to obtain wavelet packet coefficients;

[0008] performing suppression processing on the wavelet packet coefficients, wherein the suppression processing is to set the coefficients of the wavelet packet coefficients whose absolute values ​​are higher than the wavelet packet coefficient threshold to preset values;

[0009] The inverse wavelet packet transform is performed on the wavelet packet coefficients that have been suppressed to obtain the time domain signal of the airborne GPS receiving signal after the Beidou short message interference signal is suppressed.

[0010] An embodiment of the present invention provides a Beidou short message interference suppression device, the device comprising:

[0011] A determination module is used to determine whether the airborne global positioning system GPS receiving signal is interfered with by the Beidou short message signal;

[0012] A transformation module is used to perform wavelet packet transformation on the airborne GPS time domain signal interfered by the Beidou short message signal to obtain wavelet packet coefficients if the signal is interfered by the Beidou short message signal;

[0013] a suppression module, configured to perform suppression processing on the wavelet packet coefficients, wherein the suppression processing is to set the coefficients of the wavelet packet coefficients whose absolute values ​​are higher than the wavelet packet coefficient threshold to preset values;

[0014] The inverse transform module is used to perform inverse wavelet packet transform on the wavelet packet coefficients that have been suppressed to obtain the time domain signal of the airborne GPS receiving signal after the Beidou short message interference signal is suppressed.

[0015] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the Beidou short message interference suppression method is implemented.

[0016] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned Beidou short message interference suppression method.

[0017] The present invention provides a Beidou short message interference suppression method, device, computer equipment, and storage medium. The method first determines whether an airborne global positioning system (GPS) receiving signal is interfered with by a Beidou short message signal. If so, wavelet packet transform is performed on the airborne GPS time domain signal interfered with by the Beidou short message signal to obtain wavelet packet coefficients. The wavelet packet coefficients are subjected to suppression processing, wherein the suppression processing is performed by setting the coefficients whose absolute values ​​exceed a wavelet packet coefficient threshold to a preset value. The suppressed wavelet packet coefficients are subjected to an inverse wavelet packet transform to obtain a time domain signal of the airborne GPS receiving signal after suppressing the Beidou short message interference signal. The present invention can suppress the interference of Beidou short message signals on airborne GPS receivers, and retain useful GPS satellite signals while suppressing the Beidou short message signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1This is a flow chart of a Beidou short message interference suppression method according to an embodiment of the present invention;

[0020] Figure 2 This is a flow chart of a Beidou short message interference suppression method according to an embodiment of the present invention;

[0021] Figure 3 This is a principle block diagram of a Beidou short message interference suppression device in one embodiment of the present invention;

[0022] Figure 4 FIG. 1 is a schematic diagram of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] In one embodiment, if Figure 1 As shown, a Beidou short message interference suppression method is provided, and the method includes the following steps:

[0025] S10, determining whether the airborne GPS receiving signal is interfered with by the Beidou short message signal.

[0026] In this real-time embodiment, the amplitude of the airborne GPS receiving signal can be detected. If the amplitude of the airborne GPS receiving signal is too large, it is determined that the airborne GPS receiving signal is interfered with by the Beidou short message signal.

[0027] S20 , if interfered by the Beidou short message signal, performing wavelet packet transform on the airborne GPS time domain signal interfered by the Beidou short message signal to obtain wavelet packet coefficients.

[0028] Airborne GPS time-domain signals can be converted to the wavelet packet domain through wavelet packet transform. This requires using a specific wavelet function and determining the decomposition level, L, of the wavelet packet. After the transformation, the time-domain signal is decomposed into L components, each corresponding to a wavelet packet coefficient. The more similar a component is to the selected wavelet function, the larger its corresponding wavelet packet coefficient.

[0029] It should be noted that the decomposition level of the wavelet packet determines the degree of fineness of the signal division. The larger the decomposition level, the better the interference suppression effect. However, an excessively large decomposition level does not significantly improve the suppression effect, but instead increases the amount of additional calculations. Therefore, the wavelet packet decomposition level should be selected by comprehensively considering the amount of calculation and the signal bandwidth. In the embodiment of the present invention, the decomposition level can be obtained by the following formula:

[0030] 2 L+1 =f s / BW

[0031] Where L is the decomposition series, f s is the sampling frequency, and BW is the frequency band resolution of the wavelet packet decomposition. Specifically, the decomposition level can be calculated based on the sampling frequency used in practice and the required frequency band resolution.

[0032] As shown in Table 1, wavelet functions with compact support, biorthogonality, or orthogonality are listed. These characteristics make it possible to perform multi-resolution analysis when the wavelet is changed and to use a fast algorithm. In this embodiment, the wavelet function can be determined based on the contents of the following table, that is, the wavelet function is determined based on compact support, biorthogonality, orthogonality, discrete transformation, and fast algorithm, and then wavelet transform is performed based on the determined wavelet function.

[0033] It should be noted that the wavelet functions in Table 1 are wavelet functions provided in the prior art, and their calculation and usage methods are the same as those in the prior art, which will not be described in detail in this embodiment.

[0034] Table 1 Different wavelet functions and properties

[0035] Wavelet function sym coif bior / rbio dmey db1 / Haar dbN(Nb≠1) Tight support Yes Yes Yes Yes Yes Yes Biorthogonal Yes Yes Yes Yes Yes Yes Orthogonal Yes Yes No Yes Yes Yes Discrete Transformation Yes Yes Yes Yes Yes Yes Fast algorithm Yes Yes Yes Yes Yes Yes

[0036] S30, performing suppression processing on the wavelet packet coefficients, wherein the suppression processing is to set the coefficients of the wavelet packet coefficients whose absolute values ​​are higher than the wavelet packet coefficient threshold to preset values.

[0037] The purpose of setting the wavelet packet coefficient threshold is to find a threshold value that can distinguish Beidou short message interference from useful GPS satellite signals. Since GPS satellite signals are submerged in noise, the two can be uniformly regarded as having a mean of zero and a variance of σ. 2 The probability density function of Gaussian white noise can be expressed as:

[0038]

[0039] Based on the false alarm rate criterion, we have:

[0040]

[0041] Among them, P eFalse alarm rate, λ is the wavelet packet coefficient threshold.

[0042] It can be obtained:

[0043]

[0044] Wherein, Complementary error function.

[0045] S40, the wavelet packet coefficient after the suppression processing is carried out wavelet packet inverse transform, obtain the time domain signal of the airborne GPS receiving signal after the suppression of the Beidou short message interference signal.

[0046] In this embodiment, first need to select appropriate wavelet function and decomposition number, the airborne GPS receiving signal converted to wavelet packet domain by the Beidou short message interference. Then by selecting appropriate wavelet packet coefficient threshold, the absolute value of the wavelet packet coefficient is zero, then the signal is restored to time domain by wavelet packet inverse transform, so as to realize the suppression of Beidou short message interference.

[0047] The application provides a kind of Beidou short message interference suppression method, first determine whether the airborne global positioning system GPS receiving signal is interfered by Beidou short message signal;If it is interfered by Beidou short message signal, the wavelet packet coefficient is obtained by wavelet packet transformation to the airborne GPS time domain signal interfered by the Beidou short message signal;Wavelet packet coefficient is suppressed, and the coefficient of the absolute value of the wavelet packet coefficient is higher than the wavelet packet coefficient threshold is set to preset value;The wavelet packet coefficient after the suppression processing is carried out wavelet packet inverse transform, obtain the time domain signal of the airborne GPS receiving signal after the suppression of the Beidou short message interference signal. So by the present application, the interference of Beidou short message signal to airborne GPS receiver can be suppressed, and when suppressing Beidou short message signal, useful GPS satellite signal can be retained.

[0048] In an embodiment, as shown in Figure 2 A kind of Beidou short message interference suppression method is provided, and specifically includes the following steps:

[0049] The signal received by airborne GPS receiver is input into detection window, whether there is Beidou short message signal interference is judged by detection window, and specific operation is executed according to the judgment result as follows:

[0050] (1) if there is no Beidou short message signal interference, then directly processing solution, output result.

[0051] (2) if there is Beidou short message signal interference, then the Beidou short message interference suppression method based on wavelet packet transformation proposed by the present application is executed. Specifically includes:

[0052] Step 1: wavelet packet transformation

[0053] Appropriate wavelet function and decomposition series L are selected to perform L-level wavelet packet transform on the airborne GPS receiving signal interfered by Beidou short messages.

[0054] Step 2: Wavelet packet domain detection and interference suppression

[0055] An appropriate threshold for the wavelet packet domain coefficients is set, and the coefficients whose absolute values ​​are higher than the threshold are set to zero, thereby achieving the purpose of suppressing Beidou short message interference.

[0056] Step 3: Inverse wavelet packet transform

[0057] Perform inverse wavelet packet transform on the wavelet packet coefficients processed in step 2 to obtain the time domain signal after Beidou short message interference suppression.

[0058] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0059] In one embodiment, a BeiDou short message interference suppression device is provided, which corresponds to the BeiDou short message interference suppression method in the above embodiment. Figure 3 As shown, the Beidou short message interference suppression device includes: a determination module 10, a transformation module 20, a suppression module 30, and an inverse transformation module 40. The functional modules are described in detail as follows:

[0060] A determination module 10 is used to determine whether the airborne global positioning system GPS receiving signal is interfered with by the Beidou short message signal;

[0061] A transformation module 20 is configured to perform wavelet packet transformation on the airborne GPS time domain signal interfered by the Beidou short message signal to obtain wavelet packet coefficients if the signal is interfered by the Beidou short message signal;

[0062] a suppression module 30 for performing a suppression process on the wavelet packet coefficients, wherein the suppression process is to set the coefficients of the wavelet packet coefficients whose absolute values ​​are higher than the wavelet packet coefficient threshold to a preset value;

[0063] The inverse transform module 40 is used to perform inverse wavelet packet transform on the wavelet packet coefficients that have undergone suppression processing to obtain the time domain signal of the airborne GPS receiving signal after the Beidou short message interference signal is suppressed.

[0064] In an optional embodiment provided by the present invention, the transformation module 20 is specifically configured to perform wavelet packet transformation on the airborne global positioning system GPS time domain signal interfered by the Beidou short message signal according to the wavelet function and the decomposition series to obtain wavelet packet coefficients.

[0065] Furthermore, the device further comprises:

[0066] The calculation module 50 is used to calculate the value of the formula: L+1 =f s / BW calculates the decomposition level;

[0067] Where L is the decomposition series, f s is the sampling frequency, and BW is the frequency band resolution of wavelet packet decomposition.

[0068] In an optional embodiment provided by the present invention, the calculation module 50 is specifically configured to calculate the wavelet packet coefficient threshold using the following formula:

[0069]

[0070]

[0071]

[0072] Among them, P e is the false alarm rate, λ is the wavelet packet coefficient threshold, is the complementary error function.

[0073] In an optional embodiment provided by the present invention, the preset value is 0.

[0074] For the specific definition of the Beidou short message interference suppression device, please refer to the definition of the Beidou short message interference suppression method above, which will not be repeated here. The various modules in the above-mentioned Beidou short message interference suppression device can be implemented in whole or in part by software, hardware, and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0075] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 4 As shown. The computer device includes a processor, memory, network interface, and database connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal via a network connection. When executed by the processor, the computer program implements a Beidou short message interference suppression method.

[0076] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are performed:

[0077] Determine whether the GPS receiving signal of the airborne global positioning system is interfered with by the Beidou short message signal;

[0078] If the airborne GPS time domain signal is interfered by the Beidou short message signal, wavelet packet transform is performed on the airborne GPS time domain signal interfered by the Beidou short message signal to obtain wavelet packet coefficients;

[0079] performing suppression processing on the wavelet packet coefficients, wherein the suppression processing is to set the coefficients of the wavelet packet coefficients whose absolute values ​​are higher than the wavelet packet coefficient threshold to preset values;

[0080] The inverse wavelet packet transform is performed on the wavelet packet coefficients that have been suppressed to obtain the time domain signal of the airborne GPS receiving signal after the Beidou short message interference signal is suppressed.

[0081] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0082] Determine whether the GPS receiving signal of the airborne global positioning system is interfered with by the Beidou short message signal;

[0083] If the airborne GPS time domain signal is interfered by the Beidou short message signal, wavelet packet transform is performed on the airborne GPS time domain signal interfered by the Beidou short message signal to obtain wavelet packet coefficients;

[0084] performing suppression processing on the wavelet packet coefficients, wherein the suppression processing is to set the coefficients of the wavelet packet coefficients whose absolute values ​​are higher than the wavelet packet coefficient threshold to preset values;

[0085] The inverse wavelet packet transform is performed on the wavelet packet coefficients that have been suppressed to obtain the time domain signal of the airborne GPS receiving signal after the Beidou short message interference signal is suppressed.

[0086] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0087] Those skilled in the art will clearly understand that for the sake of convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A BeiDou short message interference suppression method, characterized in that: The method comprises: Determine whether the GPS receiving signal of the airborne global positioning system is interfered with by the Beidou short message signal; If the airborne GPS time domain signal is interfered by the Beidou short message signal, the wavelet packet transform is performed on the airborne GPS time domain signal interfered by the Beidou short message signal according to the wavelet function and decomposition series to obtain the wavelet packet coefficient; through the formula: L+1 =f s BW calculates the decomposition order; where L is the decomposition order, f s is the sampling frequency, BW is the frequency band resolution of wavelet packet decomposition; performing suppression processing on the wavelet packet coefficients, wherein the suppression processing is to set the coefficients whose absolute values ​​of the wavelet packet coefficients are higher than the wavelet packet coefficient threshold to a preset value; the wavelet packet coefficient threshold is used to distinguish Beidou short message interference from useful GPS satellite signals; The inverse wavelet packet transform is performed on the wavelet packet coefficients that have been suppressed to obtain the time domain signal of the airborne GPS receiving signal after the Beidou short message interference signal is suppressed.

2. The method according to claim 1, characterized in that The wavelet packet coefficient threshold is calculated by the following formula: Among them, P e is the false alarm rate, λ is the wavelet packet coefficient threshold, is the complementary error function.

3. The method according to claim 2, characterized in that The preset value is 0.

4. A Beidou short message interference suppression device, characterized in that: The device comprises: A determination module is used to determine whether the airborne global positioning system GPS receiving signal is interfered with by the Beidou short message signal; The transformation module is used to perform wavelet packet transformation on the airborne GPS time domain signal interfered by the Beidou short message signal according to the wavelet function and decomposition series to obtain the wavelet packet coefficient; through the formula: L+1 =f s BW calculates the decomposition order; where L is the decomposition order, f s is the sampling frequency, BW is the frequency band resolution of wavelet packet decomposition; a suppression module, configured to suppress the wavelet packet coefficients, wherein the suppression process is to set the coefficients whose absolute values ​​are higher than a wavelet packet coefficient threshold to a preset value; the wavelet packet coefficient threshold is used to distinguish between Beidou short message interference and useful GPS satellite signals; The inverse transform module is used to perform inverse wavelet packet transform on the wavelet packet coefficients that have been suppressed to obtain the time domain signal of the airborne GPS receiving signal after the Beidou short message interference signal is suppressed.

5. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the Beidou short message interference suppression method as described in any one of claims 1 to 3 is implemented.

6. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the Beidou short message interference suppression method as described in any one of claims 1 to 3 is implemented.

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