Polarization diversity synthesis method, system, terminal and medium based on adaptive filtering

Abstract

The invention relates to the technical field of polarization diversity synthesis of telemetry receiving system, and discloses a polarization diversity synthesis method, system, terminal and medium based on adaptive filtering. Polarization diversity synthesis in telemetry is that two diversity branches, namely, a left-hand polarization branch and a right-hand polarization branch, participate in signal synthesis to maximize the signal-to-noise ratio of the synthesized signal. The traditional polarization diversity synthesis in telemetry is realized by a phase-locked loop, which has the disadvantages of complex circuits. The invention realizes polarization diversity synthesis by an adaptive filtering method. The invention realizes polarization diversity synthesis with the characteristics of being able to filter out coherent noise and having a simple structure. For a digital phase modulation signal, the waveform near the phase mutation point will not be distorted, while the phase-locked loop method will be distorted.

Description

Technical Field

[0001] The invention relates to the technical field of polarization diversity synthesis of a telemetry receiving system, and in particular to a polarization diversity synthesis method, system, terminal and medium based on adaptive filtering. Background Art

[0002] In order to resist fluctuation fading, improve the input signal-to-noise ratio (S / N), and overcome the deep zero point effect of the single polarization of the antenna. Polarization diversity is used in the telemetry receiving system to perform polarization diversity synthesis on the two received left-hand and right-hand signals, so as to achieve the effect of resisting fluctuation fading and improving the input signal-to-noise ratio. At present, the method used for polarization diversity synthesis is the phase-locked loop method, which is divided into three-loop and two-loop phase-locked loop polarization diversity synthesis. Both methods are based on the phase-locked loop, and the disadvantage is that at least two sets of phase-locked loop circuits are required, and a reference source is required as a reference to work. Summary of the invention

[0003] In view of the problem that the phase-locked loop method in the prior art is relatively complex to implement at the intermediate frequency, the present invention provides a polarization diversity synthesis method, system, terminal and medium based on adaptive filtering. The method does not require a reference source and a phase-locked loop circuit, has a relatively simple implementation structure, and has the characteristic of filtering out coherent noise. For a digital phase-modulated signal, the waveform near the phase mutation point will not be distorted, while the phase-locked loop method will appear.

[0004] The present invention is achieved through the following technical solutions:

[0005] A polarization diversity synthesis method based on adaptive filtering comprises the following steps:

[0006] Perform signal-to-noise ratio detection on the signals received by the left-hand polarized antenna and the right-hand polarized antenna, the signal with a higher signal-to-noise ratio is the first initial signal, and the signal with a lower signal-to-noise ratio is the second initial signal;

[0007] Performing signal automatic gain control processing on the first initial signal and the second initial signal to obtain a first intermediate signal and a second intermediate signal;

[0008] Performing in-phase processing on the first intermediate signal and the second intermediate signal by adaptive filtering;

[0009] The two signals after in-phase processing are combined to complete polarization diversity synthesis.

[0010] Preferably, the signal with a high signal-to-noise ratio and the signal with a low signal-to-noise ratio are sampled through AD conversion to obtain a first initial signal and a second initial signal respectively.

[0011] Preferably, the first intermediate signal and the second intermediate signal enter an adaptive filtering circuit, and the first intermediate signal amplitude and an error signal are obtained through adaptive filtering, and in-phase processing is performed after the adaptive filtering converges.

[0012] Furthermore, the noise of the signal is eliminated in the in-phase processing, and the formula is as follows:

[0013] R^(n)=R(n)+V(n)-e(n)=R(n)+V(n)-V(n)+W(n)=R(n)+W(n);

[0014] e(n)=V(n)-W(n);

[0015] Wherein, R^(n) is the amplitude of the second intermediate signal; R(n) is the useful signal, e(n) is the error signal; W(n) and V(n) are Gaussian or Rayleigh noise.

[0016] Furthermore, the formula for combining the two signals after in-phase processing is as follows:

[0017] S RL =R^(n)C R +[L^(n)+W^(n)]C L

[0018] Where, R^(n) is the second intermediate signal amplitude; L^(n) is the first intermediate signal amplitude; C R is the second weighting factor; C L is the first weighting factor; W^(n) is the noise amplitude.

[0019] Furthermore, the calculation formula of the first weighting factor is as follows:

[0020] C L =1-C R ;

[0021] The calculation formula of the second weighting factor is as follows:

[0022]

[0023] Where K is the maximum proportionality coefficient, AGCR is the second branch AGC voltage; AGCL is the first branch AGC voltage.

[0024] A polarization diversity synthesis system based on adaptive filtering, comprising:

[0025] A first processing module is used to detect the signal-to-noise ratio of the signals received by the left-hand polarized antenna and the right-hand polarized antenna, wherein the signal with a high signal-to-noise ratio is the first initial signal, and the signal with a low signal-to-noise ratio is the second initial signal;

[0026] A second processing module, used for performing signal automatic gain control processing on the first initial signal and the second initial signal to obtain a first intermediate signal and a second intermediate signal;

[0027] A third processing module, configured to perform in-phase processing on the first intermediate signal and the second intermediate signal through adaptive filtering;

[0028] The signal merging module is used to merge the two signals after in-phase processing to complete polarization diversity synthesis.

[0029] A mobile terminal comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of a polarization diversity synthesis method based on adaptive filtering as described above when executing the computer program.

[0030] A computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the steps of a polarization diversity synthesis method based on adaptive filtering as described above.

[0031] Compared with the prior art, the present invention has the following beneficial technical effects:

[0032] The present invention provides a polarization diversity synthesis method based on adaptive filtering. In telemetry, polarization diversity synthesis is that two diversity branches, a left-hand polarization branch and a right-hand polarization branch, participate in signal synthesis to maximize the signal-to-noise ratio of the synthesized signal. Traditional polarization diversity synthesis methods in telemetry are all implemented by a phase-locked loop method, which has the disadvantages of complex implementation circuits. The present invention implements polarization diversity synthesis by an adaptive filtering method. The polarization diversity synthesis implemented by the present invention has the characteristics of being able to filter out coherent noise and having a simple implementation structure. For digital phase modulation signals (discontinuous phase modulation signals), waveforms near phase mutation points will not be distorted, while the phase-locked loop method will be distorted. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a flow chart of the polarization diversity synthesis method based on adaptive filtering in the present invention;

[0034] Figure 2 It is a structural diagram of the polarization diversity synthesis system based on adaptive filtering in the present invention;

[0035] Figure 3 It is a block diagram of the principle of adaptive polarization in-phase synthesis in the present invention;

[0036] Figure 4 This is the maximum ratio synthesis block diagram of the present invention. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0040] See also Figure 1 In one embodiment of the present invention, the present invention provides a polarization diversity synthesis method, system, terminal and medium based on adaptive filtering. The method does not require a reference source and a phase-locked loop circuit, has a relatively simple implementation structure, and has the characteristics of filtering out coherent noise. For a digital phase modulation signal, the waveform near the phase mutation point will not be distorted, while the phase-locked loop method will be.

[0041] Specifically, the polarization diversity synthesis method based on adaptive filtering includes the following steps:

[0042] S1, perform signal-to-noise ratio detection on the signals received by the left-hand polarized antenna and the right-hand polarized antenna, and compare the detected signal-to-noise ratio of the signal received by the left-hand polarized antenna with the signal-to-noise ratio of the signal received by the right-hand polarized antenna. The signal with a high signal-to-noise ratio enters the first branch and obtains a first initial signal LL(n)+WW(n); the signal with a low signal-to-noise ratio enters the second branch and obtains a second initial signal RR(n)+VV(n); wherein WW(n) and VV(n) are Gaussian or Rayleigh noise;

[0043] S2, the first initial signal LL(n)+WW(n) and the second initial signal RR(n)+VV(n) pass through the AGC circuit respectively to obtain the first intermediate signal L(n)+W(n) and the second intermediate signal R(n)+V(n);

[0044] S3, the first intermediate signal L(n)+W(n) and the second intermediate signal R(n)+V(n) enter the adaptive filtering circuit, such as Figure 3 As shown, the two branch signals are processed in phase by adaptive filtering, and the noise of the signal is eliminated during the in-phase processing;

[0045] S4, the two branch signals after in-phase processing are combined to complete polarization diversity combining, such as Figure 4 shown.

[0046] Specifically, the signal with high signal-to-noise ratio in the first branch and the signal with low signal-to-noise ratio in the second branch are sampled through AD conversion to obtain the first initial signal LL(n)+WW(n) and the second initial signal RR(n)+VV(n).

[0047] Specifically, the first intermediate signal L(n)+W(n) and the second intermediate signal R(n)+V(n) enter the adaptive filtering circuit, and the first intermediate signal amplitude L^(n) and the error signal e(n) are obtained through adaptive filtering. After the adaptive filtering converges, L^(n)=R(n), e(n)=V(n)-W(n), where the signals R(n) and L(n) are related, V(n) is not related to R(n) and L(n); W(n) is not related to R(n) and L(n); wherein the first Gaussian or Rayleigh noise W(n) is smaller than the second Gaussian or Rayleigh noise V(n), thereby completing the in-phase processing of the two signals R(n) and L(n). wherein, the first intermediate signal L(n)+W(n) passes through the weight coefficient W(Z) of the filter inside the adaptive filtering module in the adaptive filtering circuit, and adopts the minimum mean square error algorithm LMS.

[0048] Among them, the noise of the signal is eliminated in the in-phase processing, and the formula is as follows:

[0049] R^(n)=R(n)+V(n)-e(n)=R(n)+V(n)-V(n)+W(n)=R(n)+W(n);

[0050] e(n)=V(n)-W(n);

[0051] Among them, R^(n) is the amplitude of the second intermediate signal; R(n) is the right-handed signal, e(n) is the adaptive signal; W(n) is the first Gaussian or Rayleigh noise; V(n) is the second Gaussian or Rayleigh noise.

[0052] The second Gaussian or Rayleigh noise V(n) is eliminated, W(n) is a signal with a high signal-to-noise ratio carrying the first Gaussian or Rayleigh noise, and the first Gaussian or Rayleigh noise W(n) is smaller than the second Gaussian or Rayleigh noise V(n), so the noise carried by R^(n) is weakened.

[0053] Specifically, the formula for combining the two branch signals after in-phase processing is as follows:

[0054] S RL =R^(n)C R +[L^(n)+W^(n)]C L

[0055] Where, R^(n) is the second intermediate signal amplitude; L^(n) is the first intermediate signal amplitude; C R is the second weighting factor; C L is the first weighting factor; W^(n) is the noise amplitude.

[0056] The calculation formula of the first weighting factor is as follows:

[0057] C L =1-C R ;

[0058] The calculation formula of the second weighting factor is as follows:

[0059]

[0060] Where K is the maximum proportionality coefficient, AGCR is the second branch AGC voltage; AGCL is the first branch AGC voltage.

[0061] In summary, the present invention provides a polarization diversity synthesis method based on adaptive filtering. In telemetry, polarization diversity synthesis is that two diversity branches, the left-hand polarization branch and the right-hand polarization branch, participate in signal synthesis to maximize the signal-to-noise ratio of the synthesized signal. Traditional methods of polarization diversity synthesis in telemetry are all implemented by a phase-locked loop, which has the disadvantages of complex implementation circuits. The present invention implements polarization diversity synthesis by an adaptive filtering method. The polarization diversity synthesis implemented by the present invention has the characteristics of being able to filter out coherent noise and having a simple implementation structure. For digital phase modulation signals (discontinuous phase modulation signals), the waveform near the phase mutation point will not be distorted, while the phase-locked loop method will be distorted.

[0062] according to Figure 2 As shown, the present invention also provides a polarization diversity synthesis system based on adaptive filtering, comprising a first processing module, a second processing module, a third processing module and a signal merging module;

[0063] A first processing module is used to detect the signal-to-noise ratio of the signals received by the left-hand polarized antenna and the right-hand polarized antenna, wherein the signal with a high signal-to-noise ratio is the first initial signal, and the signal with a low signal-to-noise ratio is the second initial signal;

[0064] A second processing module, used for performing signal automatic gain control processing on the first initial signal and the second initial signal to obtain a first intermediate signal and a second intermediate signal;

[0065] A third processing module, configured to perform in-phase processing on the first intermediate signal and the second intermediate signal through adaptive filtering;

[0066] The signal merging module is used to merge the two signals after in-phase processing to complete polarization diversity synthesis.

[0067] The present invention also provides a mobile terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, such as a polarization diversity synthesis program based on adaptive filtering.

[0068] When the processor executes the computer program, the steps of the polarization diversity synthesis method based on adaptive filtering are implemented, for example: signal-to-noise ratio detection is performed on the signals received by the left-hand polarized antenna and the right-hand polarized antenna, the signal with a high signal-to-noise ratio is the first initial signal, and the signal with a low signal-to-noise ratio is the second initial signal;

[0069] Performing signal automatic gain control processing on the first initial signal and the second initial signal to obtain a first intermediate signal and a second intermediate signal;

[0070] Performing in-phase processing on the first intermediate signal and the second intermediate signal by adaptive filtering;

[0071] The two signals after in-phase processing are combined to complete polarization diversity synthesis.

[0072] Alternatively, when the processor executes the computer program, the functions of each module in the above system are realized, for example:

[0073] A first processing module is used to detect the signal-to-noise ratio of the signals received by the left-hand polarized antenna and the right-hand polarized antenna, wherein the signal with a high signal-to-noise ratio is the first initial signal, and the signal with a low signal-to-noise ratio is the second initial signal;

[0074] A second processing module, used for performing signal automatic gain control processing on the first initial signal and the second initial signal to obtain a first intermediate signal and a second intermediate signal;

[0075] A third processing module, configured to perform in-phase processing on the first intermediate signal and the second intermediate signal through adaptive filtering;

[0076] The signal merging module is used to merge the two signals after in-phase processing to complete polarization diversity synthesis.

[0077] Exemplarily, the computer program may be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the mobile terminal. For example, the computer program may be divided into a first processing module, a second processing module, a third processing module, and a signal merging module; the specific functions of each module are as follows:

[0078] A first processing module is used to detect the signal-to-noise ratio of the signals received by the left-hand polarized antenna and the right-hand polarized antenna, wherein the signal with a high signal-to-noise ratio is the first initial signal, and the signal with a low signal-to-noise ratio is the second initial signal;

[0079] A second processing module, used for performing signal automatic gain control processing on the first initial signal and the second initial signal to obtain a first intermediate signal and a second intermediate signal;

[0080] A third processing module, configured to perform in-phase processing on the first intermediate signal and the second intermediate signal through adaptive filtering;

[0081] The signal merging module is used to merge the two signals after in-phase processing to complete polarization diversity synthesis.

[0082] The mobile terminal may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The mobile terminal may include, but is not limited to, a processor and a memory.

[0083] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center based on the mobile terminal, and uses various interfaces and lines to connect various parts of the entire mobile terminal.

[0084] The memory may be used to store the computer programs and / or modules, and the processor implements the various functions based on the mobile terminal by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0085] The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SmartMediaCard, SMC), a secure digital (SecureDigital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0086] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the polarization diversity synthesis method based on adaptive filtering are implemented.

[0087] If the module / unit based on mobile terminal integration is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0088] Based on such understanding, the present invention implements all or part of the processes in the above method, and can also be completed by instructing related hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the polarization diversity synthesis method based on adaptive filtering can be implemented. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc.

[0089] The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0090] It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A polarization diversity synthesis method based on adaptive filtering, characterized in that: The steps include: Perform signal-to-noise ratio detection on the signals received by the left-hand polarized antenna and the right-hand polarized antenna, the signal with a higher signal-to-noise ratio is the first initial signal, and the signal with a lower signal-to-noise ratio is the second initial signal; Performing signal automatic gain control processing on the first initial signal and the second initial signal to obtain a first intermediate signal and a second intermediate signal; Performing in-phase processing on the first intermediate signal and the second intermediate signal by adaptive filtering; The two signals after in-phase processing are combined to complete polarization diversity synthesis; The first intermediate signal and the second intermediate signal enter the adaptive filtering circuit, the first intermediate signal amplitude and the error signal are obtained through adaptive filtering, and the same-phase processing is performed after the adaptive filtering converges; The noise of the signal is eliminated in the in-phase processing, and the formula is as follows: ； e(n)=V(n)-W(n); Wherein, R^(n) is the amplitude of the second intermediate signal; R(n) is the useful signal, e(n) is the error signal; W(n) and V(n) are Gaussian or Rayleigh noise.

2. The polarization diversity synthesis method based on adaptive filtering according to claim 1, characterized in that: The signal with a high signal-to-noise ratio and the signal with a low signal-to-noise ratio are sampled through AD conversion to obtain a first initial signal and a second initial signal respectively.

3. The polarization diversity synthesis method based on adaptive filtering according to claim 1, characterized in that: The formula for combining the two signals after in-phase processing is as follows: in, is the second intermediate signal amplitude; L^(n) is the first intermediate signal amplitude; is the second weighting factor; is the first weighting factor; W^(n) is the noise amplitude; S RL is the combined signal amplitude.

4. The polarization diversity synthesis method based on adaptive filtering according to claim 3, characterized in that: The calculation formula of the first weighting factor is as follows: =1- ； The calculation formula of the second weighting factor is as follows: ； Where K is the maximum proportionality coefficient, , AGCR is the second branch AGC voltage; AGCL is the first branch AGC voltage.

5. A polarization diversity synthesis system based on adaptive filtering, characterized in that: include: A first processing module is used to detect the signal-to-noise ratio of the signals received by the left-hand polarized antenna and the right-hand polarized antenna, wherein the signal with a high signal-to-noise ratio is the first initial signal, and the signal with a low signal-to-noise ratio is the second initial signal; A second processing module, used for performing signal automatic gain control processing on the first initial signal and the second initial signal to obtain a first intermediate signal and a second intermediate signal; A third processing module, configured to perform in-phase processing on the first intermediate signal and the second intermediate signal through adaptive filtering; A signal merging module is used to merge the two signals after in-phase processing to complete polarization diversity synthesis; The first intermediate signal and the second intermediate signal enter the adaptive filtering circuit, the first intermediate signal amplitude and the error signal are obtained through adaptive filtering, and the same-phase processing is performed after the adaptive filtering converges; The noise of the signal is eliminated in the in-phase processing, and the formula is as follows: ； e(n)=V(n)-W(n); Wherein, R^(n) is the amplitude of the second intermediate signal; R(n) is the useful signal, e(n) is the error signal; W(n) and V(n) are Gaussian or Rayleigh noise.

6. A mobile terminal comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the polarization diversity synthesis method based on adaptive filtering as claimed in any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of a polarization diversity synthesis method based on adaptive filtering as claimed in any one of claims 1 to 4 are implemented.

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