Moving target weak scattered signal enhancement method and multi-frequency GNSS-S radar system

Abstract

The invention relates to a moving target weak scattering signal enhancement method and a multi-frequency GNSS-S radar system, and the enhancement method comprises the steps: obtaining direct signals and scattering signals of n frequency bands, and carrying out the pre-demodulation of the scattering signals according to the direct signals; performing pairwise combination on the n pre-demodulated scattering signals to form differential signal pairs, and performing amplitude addition and phase cancellation operation on the two scattering signals in each differential signal pair to form a double-frequency differential signal; performing long-time coherent accumulation on each double-frequency differential signal; and performing non-coherent accumulation on all the dual-frequency differential signals subjected to coherent accumulation to obtain a target value I of signal-to-noise ratio improvement. According to the invention, the signals of different frequency bands are grouped in pairs to form double-frequency differential signals, the double-frequency differential signals are subjected to phase difference to remove Doppler phase fluctuation caused by target motion, and the signal-to-noise ratio of the signals is improved through amplitude combination, long-time coherent accumulation and non-coherent accumulation.

Description

Technical Field

[0001] The present invention relates to the field of radar technology, and in particular to a method for enhancing weak scattered signals of moving targets and a multi-frequency GNSS-S radar system. Background Art

[0002] The GNSS-S radar system uses the scattered signals of GNSS navigation satellites to detect ground targets. It has the advantages of rich signal sources, all-day and all-weather detection, low payload power consumption, and easy satellite mounting. This technology can complement radar, optical remote sensing and other means to improve the perception of ground targets and is an important means of ground object detection. In recent years, target detection based on GNSS-S signals has become a hot topic in scientific research.

[0003] However, GNSS satellites are at a high altitude above the ground, and the signal transmission power is small. The signal power reaching the ground is usually around -130dBm. The GNSS signal scattered by the ground target will be even weaker. Therefore, enhancing the weak GNSS signal scattered by the target to improve the signal-to-noise ratio is a necessary condition for achieving ground target detection. Long-term coherent accumulation is a very effective means to improve the signal-to-noise ratio of weak signals. However, when the target is in motion, the movement of the target will bring additional Doppler frequency to the scattered GNSS signal, which will cause the echo signal carrier frequency to be unable to be completely demodulated, and the residual frequency will affect the coherent accumulation effect of the echo signal. Therefore, how to improve the signal-to-noise ratio of the GNSS echo signal scattered by the moving target is a key technology for the GNSS-S radar system to detect moving targets. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method for enhancing the weak scattered signal of a moving target and a multi-frequency GNSS-S radar system to enhance the detection capability of moving weak targets.

[0005] To achieve the above-mentioned object of the invention, the present invention provides a method for enhancing weak scattered signals of moving targets, comprising the following steps:

[0006] Step S1, obtaining direct signals and scattered signals of n frequency bands, and pre-demodulating the scattered signals according to the direct signals;

[0007] Step S2, combining the n scattered signals that have completed pre-demodulation in pairs to form differential signal pairs, performing amplitude addition and phase cancellation operations on the two scattered signals in each differential signal pair to form a dual-frequency differential signal;

[0008] Step S3, performing long-term coherent accumulation on each of the dual-frequency differential signals;

[0009] Step S4: performing non-coherent accumulation on all the dual-frequency differential signals after the coherent accumulation to obtain a target value for improving the signal-to-noise ratio.

[0010] According to a technical solution of the present invention, the direct signal is a signal of all visible GNSS satellites received by a direct receiving antenna pointing to the zenith;

[0011] The scattered signal is a GNSS signal scattered by a target and received by a scattering receiving antenna pointing to the target area;

[0012] The direct signal and the scattered signal together form 2n signals, which are subjected to radio frequency preprocessing and AD sampling in the same time and converted into digital intermediate frequency signals.

[0013] According to a technical solution of the present invention, in step S1, it specifically includes:

[0014] Step S11: for the scattered signal in each frequency band, the instantaneous Doppler frequency f, code phase C and navigation message B of the satellite carrier are obtained by solving the direct signal;

[0015] Step S12, performing carrier demodulation, pseudo-random code correlation and message demultiplexing operations on the scattered signal through the instantaneous Doppler frequency f of the satellite carrier, the code phase C and the navigation message B, to obtain an energy value of the scattered signal after demodulation and spread spectrum, wherein the energy value is in a complex form and includes amplitude and phase.

[0016] According to a technical solution of the present invention, in the step S2, it specifically includes:

[0017] Step S21: The n scattered signals S1, ..., Sn after pre-demodulation are combined in pairs to form differential signal pairs, where

[0018] Step S22: for any two scattered signals S in a differential signal pair i With S j , the instantaneous Doppler frequency f of the satellite carrier is obtained through its direct signal i and f j , establish the dual-frequency signal phase relationship model to obtain the phase correction factor k i,j , the phase corrector factor k i,j The calculation formula is:

[0019] k i,j =f i / f j ;

[0020] Step S23, performing phase cancellation on the phases of each differential signal pair to obtain a differential phase, wherein the calculation formula of the differential phase is:

[0021]

[0022] in, Indicates the differential signal pair (S i ,S j ), Indicates the differential signal pair (S i ,S j ) in the scattered signal S i The phase of Indicates the differential signal pair (S i ,S j ) in the scattered signal S j The phase of k i,j Indicates the differential signal pair (S i ,S j ) of the phase corrector factor;

[0023] Step S24: Add the amplitudes of the differential signal pairs to obtain a combined amplitude, the calculation formula of the combined amplitude is:

[0024] AA i,j =A i +A j ;

[0025] Among them, AA i,j Indicates the differential signal pair (S i ,S j ), A i Indicates the differential signal pair (S i ,S j ) in the scattered signal S i The amplitude, A j Indicates the differential signal pair (S i ,S j ) in the scattered signal S j the magnitude of

[0026] Step S25: Form a dual-frequency differential signal according to the calculated joint amplitude and differential phase. For any differential signal pair (S i ,S j ), the dual-frequency differential signal formed is expressed as ΔS i,j , dual frequency differential signal ΔS i,j The amplitude and phase of

[0027] According to a technical solution of the present invention, in step S3, it specifically includes:

[0028] Taking the code period of the GNSS satellite pseudo-random code as the unit, t m The coherent accumulation of integer cycles, and t m ≥100; for each dual-frequency differential signal ΔS i,j The sum is calculated by coherent accumulation, and the result of coherent accumulation is

[0029] According to a technical solution of the present invention, in step S4, it specifically includes:

[0030] right The coherent accumulation result p of the dual-frequency differential signal i,j After taking the amplitude, non-coherent accumulation is performed to obtain the target value I. The calculation formula is:

[0031]

[0032] According to one aspect of the present invention, the present invention provides a multi-frequency GNSS-S radar system for implementing the above-mentioned method for enhancing weak scattered signals of moving targets, comprising:

[0033] A direct receiving antenna, comprising n direct GNSS signal receiving channels, for receiving the direct signals of n different frequency bands;

[0034] A scattering receiving antenna, comprising n scattering GNSS signal receiving channels, for receiving GNSS signals of n frequency bands scattered by ground targets;

[0035] The 2n channel signal processor is used to simultaneously receive n direct signals and n scattered signals, enhance the weak scattered signals of the moving target, and then detect the moving target.

[0036] According to a technical solution of the present invention, n is greater than or equal to 2.

[0037] According to one aspect of the present invention, an electronic device includes: one or more processors, one or more memories, and one or more computer programs; wherein the processor is connected to the memory, and the one or more computer programs are stored in the memory. When the electronic device is running, the processor executes the one or more computer programs stored in the memory so that the electronic device performs the above-mentioned method for enhancing weak scattered signals of moving targets.

[0038] According to one aspect of the present invention, a computer readable storage medium is used to store computer instructions, and when the computer instructions are executed by a processor, the above-mentioned method for enhancing weak scattered signals of moving targets is implemented.

[0039] Compared with the prior art, the method for enhancing the weak scattered signal of a moving target and the multi-frequency GNSS-S radar system thereof proposed in the present invention have the following advantages:

[0040] In the present invention, the multi-frequency GNSS-S radar system can be applied to the detection of moving targets, and can synchronously receive direct GNSS signals of n frequency bands and scattered GNSS echo signals of n frequency bands in real time, and detect targets through scattered GNSS signals of n frequency bands. By combining GNSS signals of multiple frequency bands, the energy of weak GNSS signals scattered by the target can be enhanced.

[0041] In the present invention, by constructing the phase relationship of GNSS scattered signals in multiple frequency bands, the residual phase fluctuation caused by the target motion is offset, the coherence of the echo signal is improved, and the effect of long-term coherent accumulation on improving the echo signal-to-noise ratio of the moving target is enhanced, thereby achieving the effect of suppressing the additional phase fluctuation of the echo signal caused by the moving target.

[0042] The present invention uses L-band electromagnetic signals transmitted by GNSS satellites to detect targets. GNSS signals have global coverage, do not require additional transmitting equipment, and have a simple system. They make full use of signal components of multiple frequency bands of navigation satellites to detect weak moving targets, and have a simple system structure, which is easy to implement in engineering.

[0043] The present invention makes full use of the phase relationship between multi-frequency GNSS signals to offset the signal phase fluctuation caused by the motion of the measured target, can realize long-term coherent accumulation processing, improve the echo signal-to-noise ratio, and the algorithm has a small amount of calculation and is convenient for real-time processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 Schematically showing an architecture diagram of a multi-frequency GNSS-S radar system provided according to one embodiment of the present invention;

[0046] Figure 2 A flowchart schematically showing a method for enhancing weak scattered signals of moving targets according to an embodiment of the present invention;

[0047] Figure 3 A flowchart schematically showing a method for enhancing weak scattered signals of moving targets according to an embodiment of the present invention;

[0048] Figure 4 Schematically showing a flow chart of scattered signal pre-demodulation according to one embodiment of the present invention;

[0049] Figure 5 A flowchart schematically illustrates a dual-frequency differential signal architecture according to an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The description of the embodiments of this specification should be combined with the corresponding drawings, which should be considered as part of the complete specification. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated for simplification or convenience. Furthermore, the parts of each structure in the drawings will be described separately. It is worth noting that the elements not shown in the drawings or not described in words are in a form known to ordinary technicians in the relevant technical field.

[0051] The description of the embodiments herein and any reference to directions and orientations are only for the convenience of description and are not to be construed as any limitation on the scope of protection of the present invention. The following description of the preferred embodiments may involve combinations of features, which may exist independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0052] Since GNSS signals are coded signals, unlike the linear frequency modulation signals of conventional radar systems, the ambiguity function of GNSS signals is in the shape of a thumbtack and is Doppler sensitive. The residual Doppler frequency of the target motion is more seriously affected. Therefore, it is very difficult to enhance the signal-to-noise ratio of the echo signal of the moving target. Fortunately, the GNSS navigation satellite system itself transmits electromagnetic signals of multiple frequency bands on the same satellite at the same time. For example, Beidou satellites simultaneously transmit navigation signals of multiple different frequency bands such as B1I, B1C, B2a, B2b, and B3I. The center frequencies of their satellite carriers are 1561MHz, 1575MHz, 1176MHz, 1207MHz, and 1268MHz, respectively. Making full use of the signals of these multiple frequency bands to process the echo scattered by the target is an effective way to improve the signal-to-noise ratio of the target echo. The present invention proposes a multi-frequency GNSS-S radar system and a method for enhancing weak scattered signals of moving targets, which fully utilizes multiple frequency band signals broadcast by a navigation satellite system to form a multi-frequency GNSS-S radar receiving system, and uses the phase relationship between the dual-frequency GNSS signals to cancel the phase and add the amplitude to obtain a dual-frequency differential signal, and then performs long-term coherent accumulation on the dual-frequency differential signal to improve the signal-to-noise ratio of the moving target echo signal and enhance the detection capability of the moving weak target.

[0053] like Figure 1 As shown, the present invention provides a multi-frequency GNSS-S radar system, comprising:

[0054] The direct receiving antenna 10 is a multi-band GNSS signal receiving antenna, including n direct GNSS signal receiving channels, capable of receiving navigation signals of n frequency bands, pointing to the zenith direction, and used for receiving direct signals from navigation satellites of n different frequency bands;

[0055] The scattering receiving antenna 20 adopts a high-gain multi-band GNSS receiving antenna, includes n scattering GNSS signal receiving channels, points to the target area to be detected, can receive navigation signals of n frequency bands, and is used to receive GNSS signals of n frequency bands scattered by ground targets;

[0056] The 2n channel signal processor 30 is used to perform RF preprocessing, AD sampling and enhancement of the weak scattered signals of moving targets on the n direct signals received by the direct receiving antenna 10 and the n scattered signals received by the scattered receiving antenna 20, so as to detect the target scattered signals.

[0057] like Figure 2 and Figure 3 As shown, a method for enhancing weak scattered signals of moving targets provided by the present invention mainly includes four parts: single-frequency signal pre-demodulation, dual-frequency differential signal construction, differential signal coherent accumulation, and multi-frequency signal non-coherent accumulation, and specifically includes the following steps:

[0058] Step S1, obtaining direct signals and scattered signals of n frequency bands, and pre-demodulating the scattered signals according to the direct signals;

[0059] The direct signal is the signal of all visible GNSS satellites received by the direct receiving antenna pointing to the zenith; the scattered signal is the GNSS signal scattered by the target received by the scattering receiving antenna pointing to the target area; the direct signal and the scattered signal together constitute 2n signals, use the same clock source, perform RF preprocessing and AD sampling, and convert into a digital intermediate frequency signal.

[0060] like Figure 4 As shown, in step S1, the scattered signal is pre-demodulated according to the direct signal, specifically including:

[0061] Step S11: for the scattered signal of each frequency band, the instantaneous Doppler frequency f, code phase C and navigation message B of the satellite carrier are obtained by solving the direct signal;

[0062] Step S12, performing carrier demodulation, pseudo-random code correlation and message demultiplexing operations on the scattered signal through the instantaneous Doppler frequency f of the satellite carrier, the code phase C and the navigation message B, to obtain an energy value of the scattered signal after demodulation and spread spectrum, wherein the energy value is in a complex form and includes amplitude and phase.

[0063] When pre-demodulating the scattered signal according to the direct GNSS signal for each single-frequency signal, first track the direct GNSS satellite signal in real time to obtain the instantaneous Doppler frequency f, code phase C and navigation message B of the satellite carrier. Then use the values ​​of f, C, and B to perform carrier demodulation, pseudo-random code correlation, and message bit operations on the scattered signal to obtain the pre-demodulated signal energy value of the target scattered GNSS signal, which is in complex form, with an amplitude of A and a phase of When the target is in motion, the pre-demodulated signal still has additional Doppler frequency caused by the target motion, which makes the phase Constantly changing, cannot be directly referenced and accumulated.

[0064] Step S2: Combining the n scattered signals that have completed pre-demodulation in pairs to form differential signal pairs, performing amplitude addition and phase cancellation operations on the two scattered signals in each differential signal pair to form A dual frequency differential signal;

[0065] like Figure 5 As shown, in the step S2, it specifically includes:

[0066] Step S21: The n scattered signals S1, ..., Sn after pre-demodulation are combined in pairs to form differential signal pairs, where

[0067] Step S22: for any two signals S in a differential signal pair i With S j , the instantaneous Doppler frequency f of the satellite carrier is obtained through its direct signal i and f j , establish the dual-frequency signal phase relationship model to obtain the phase correction factor k i,j Establish the dual-frequency signal phase relationship model to obtain the phase correction factor k i,j , the phase corrector factor k i,j The calculation formula is:

[0068] k i,j =f i / f j ;

[0069] Step S23, performing phase cancellation on the phases of each differential signal pair to obtain a differential phase, wherein the calculation formula of the differential phase is:

[0070]

[0071] in, Indicates the differential signal pair (S i ,S j ), Indicates the differential signal pair (S i ,S j ) in signal S i The phase of Indicates the differential signal pair (S i ,S j ) in signal S j The phase of k i,j Indicates the differential signal pair (S i ,S j ) of the phase corrector factor;

[0072] Step S24: Add the amplitudes of the differential signal pairs to obtain a combined amplitude, the calculation formula of the combined amplitude is:

[0073] AA i,j =A i +A j ;

[0074] Among them, AA i,j Indicates the differential signal pair (S i ,S j ), A i Indicates the differential signal pair (S i ,S j ) in signal S i The amplitude, A j Indicates the differential signal pair (S i ,S j ) in signal S j the magnitude of

[0075] Step S25: Form a dual-frequency differential signal according to the calculated joint amplitude and differential phase. For any differential signal pair (S i ,S j ), the dual-frequency differential signal formed is expressed as ΔS i,j , dual frequency differential signal ΔS i,j The amplitude and phase of

[0076] Step S3, performing long-term coherent accumulation on each dual-frequency differential signal;

[0077] Taking the code period of the GNSS satellite pseudo-random code as the unit, t m The coherent accumulation of integer cycles, and t m ≥100; for each dual-frequency differential signal ΔS i,j The summation is performed by coherent accumulation, and the accumulated signal is

[0078] For example, the code period of Beidou B1I signal is 1ms, tm It is taken as 100, that is, each differential signal is coherently accumulated for 100ms.

[0079] Step S4: after completing the coherent accumulation The dual-frequency differential signals are non-coherently accumulated to obtain the target value I of the signal-to-noise ratio improvement.

[0080] In the step S4, it specifically includes:

[0081] right The coherent accumulation result p of the dual-frequency differential signal i,j After taking the amplitude, non-coherent accumulation is performed to obtain the target value I. The calculation formula is:

[0082] The present invention proposes a multi-frequency GNSS-S radar system and a method for enhancing weak scattered signals of moving targets, which makes full use of the signals of multiple frequency bands transmitted by the GNSS satellite system, builds a 2n-channel multi-frequency GNSS-S radar system, and simultaneously receives direct GNSS signals of n frequency bands and scattered GNSS signals of n frequency bands. The scattered GNSS signals of moving weak targets are enhanced by a weak signal enhancement method, thereby achieving target detection. The system generates dual-frequency differential signals, performs phase differentiation on each dual-frequency differential signal, removes the phase fluctuation caused by the additional Doppler in the scattered GNSS signal caused by the target motion, and then improves the signal-to-noise ratio of each dual-frequency differential signal through long-term coherent accumulation after amplitude combination. Finally, it performs non-coherent accumulation on multiple differential signal pairs to improve the signal-to-noise ratio of weak scattered signals. Compared with traditional radar systems, the multi-frequency GNSS-S radar system has a wide signal coverage range, makes full use of the multiple frequency signals transmitted by the navigation satellite, enhances the weak GNSS scattered signals, and can detect small and moving targets. It has the advantages of low power consumption and simple structure.

[0083] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0084] Finally, it should be noted that the above is a preferred embodiment of the present invention. It should be pointed out that although the preferred embodiment of the present invention has been described, for those skilled in the art, once the basic creative concept of the present invention is known, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. Therefore, the attached claims are intended to be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the embodiments of the present invention.

Claims

1. A method for enhancing weak scattered signals of moving targets, characterized in that: The following steps are involved: Step S1, obtaining direct signals and scattered signals of n frequency bands, and pre-demodulating the scattered signals according to the direct signals; Step S2, combining the n scattered signals that have completed pre-demodulation in pairs to form differential signal pairs, performing amplitude addition and phase cancellation operations on the two scattered signals in each differential signal pair to form a dual-frequency differential signal; Step S3, performing long-term coherent accumulation on each of the dual-frequency differential signals; Step S4: performing non-coherent accumulation on all the dual-frequency differential signals after the coherent accumulation to obtain a target value I for improving the signal-to-noise ratio.

2. The method for enhancing weak scattered signals of moving targets according to claim 1, characterized in that: The direct signal is the signal of all visible GNSS satellites received by the direct receiving antenna pointing to the zenith; The scattered signal is a GNSS signal scattered by a target and received by a scattering receiving antenna pointing to the target area; The direct signal and the scattered signal together form 2n signals, which use the same clock source, undergo radio frequency preprocessing and AD sampling, and are converted into digital intermediate frequency signals.

3. The method for enhancing weak scattered signals of moving targets according to claim 1, characterized in that: In the step S1, the pre-demodulation specifically includes: Step S11: for the scattered signal in each frequency band, the instantaneous Doppler frequency f, code phase C and navigation message B of the satellite carrier are obtained by solving the direct signal; Step S12, performing carrier demodulation, pseudo-random code correlation and message demultiplexing operations on the scattered signal through the instantaneous Doppler frequency f of the satellite carrier, the code phase C and the navigation message B, to obtain an energy value of the scattered signal after demodulation and spread spectrum, wherein the energy value is in a complex form and includes amplitude and phase.

4. The method for enhancing the weak scattered signal of a moving target according to claim 3, characterized in that: In the step S2, it specifically includes: Step S21: The n scattered signals S1, ..., Sn after pre-demodulation are combined in pairs to form differential signal pairs, where Step S22: for any two scattered signals S in a differential signal pair i With S j , the instantaneous Doppler frequency f of the satellite carrier is obtained through its direct signal i and f j , establish the dual-frequency signal phase relationship model to obtain the phase correction factor k i,j , the phase corrector factor k i,j The calculation formula is: k i,j =f i / f j ; Step S23, performing phase cancellation on the phases of each differential signal pair to obtain a differential phase, wherein the calculation formula of the differential phase is: in, Indicates the differential signal pair (S i ,S j ), Indicates the differential signal pair (S i ,S j ) in the scattered signal S i The phase of Indicates the differential signal pair (S i ,S j ) in the scattered signal S j The phase of k i,j Indicates the differential signal pair (S i ,S j ) of the phase corrector factor; Step S24: Add the amplitudes of the differential signal pairs to obtain a combined amplitude, the calculation formula of the combined amplitude is: CHALLENGE ACCEPTED i,j =A i +A j ; Among them, AA i,j Indicates the differential signal pair (S i ,S j ), A i Indicates the differential signal pair (S i ,S j ) in the scattered signal S i The amplitude, A j Indicates the differential signal pair (S i ,S j ) in the scattered signal S j the magnitude of Step S25: Form a dual-frequency differential signal according to the calculated joint amplitude and differential phase. For any differential signal pair (S i ,S j ), the dual-frequency differential signal formed is expressed as ΔS i,j , dual frequency differential signal ΔS i,j The amplitude and phase of 5. The method for enhancing weak scattered signals of moving targets according to claim 4, characterized in that: In the step S3, it specifically includes: Take the code period of the GNSS satellite pseudo-random code as the unit, and perform t m The coherent accumulation of integer cycles, and t m ≥100; for each dual-frequency differential signal ΔS i,j The sum is calculated by coherent accumulation, and the result of coherent accumulation is 6. The method for enhancing weak scattered signals of moving targets according to claim 5, characterized in that: In the step S4, it specifically includes: right The coherent accumulation result p of the dual-frequency differential signal i,j After taking the amplitude, non-coherent accumulation is performed to obtain the target value I. The calculation formula is:

7. A multi-frequency GNSS-S radar system, characterized in that: The method for enhancing the weak scattered signal of a moving target according to any one of claims 1 to 6 comprises: A direct receiving antenna, comprising n direct GNSS signal receiving channels, for receiving the direct signals of n different frequency bands; A scattering receiving antenna, comprising n scattering GNSS signal receiving channels, for receiving GNSS signals of n frequency bands scattered by ground targets; The 2n channel signal processor is used to simultaneously receive n direct signals and n scattered signals, enhance the weak scattered signals of the moving target, and then detect the moving target.

8. The multi-frequency GNSS-S radar system according to claim 7, characterized in that: n is greater than or equal to 2.

9. An electronic device, characterized in that: include: One or more processors, one or more memories, and one or more computer programs; wherein the processor is connected to the memory, and the one or more computer programs are stored in the memory. When the electronic device is running, the processor executes the one or more computer programs stored in the memory so that the electronic device performs the method for enhancing the weak scattered signal of a moving target as described in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: Used to store computer instructions, which, when executed by a processor, implement the method for enhancing weak scattered signals of moving targets as claimed in any one of claims 1 to 6.

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