Non-uniform intermittent sampling interference method, device and equipment based on RFSoC

Abstract

The invention relates to a non-uniform intermittent sampling interference method, device and equipment based on RFSoC. The method comprises the following steps: acquiring the sub-pulse width of an intercepted intra-pulse frequency coding radar signal; obtaining a target interference parameter according to a constraint formula and the sub-pulse width; sampling, forwarding and modulating according to the target interference parameter to obtain a non-uniform intermittent sampling and forwarding interference signal; and after the non-uniform intermittent sampling and forwarding interference signal is subjected to RFSoC interpolation frequency mixing processing, the radar is interfered. According to the technical scheme, an RFSoC device is adopted, the interference method is low in power consumption and good in real-time performance, non-uniform intermittent sampling and forwarding interference is achieved by restraining interference parameters and adopting a low-complexity and high-real-time mode, the complexity of the method is reduced, meanwhile, the interference efficiency and stability of the non-uniform intermittent sampling and forwarding interference are improved, and the interference performance of the non-uniform intermittent sampling and forwarding interference is improved. And the interference effect is good.

Description

Technical Field

[0001] The present invention relates to the field of radar jamming technology, and in particular to a non-uniform intermittent sampling jamming method, device and equipment based on RFSoC. Background Art

[0002] With the gradual development of anti-interference technology, the forms of radar signals are becoming increasingly diverse. Intra-pulse frequency coding modulation technology is one of the many anti-interference technologies. Its interference suppression performance is outstanding, which greatly reduces the interference efficiency of the jammer. The general parameters of traditional intermittent sampling and forwarding interference are relatively regular, and are easily perceived by some advanced interference perception algorithms, and then suppressed by targeted anti-interference means, such as designing intra-pulse frequency agile signals, and suppressing interference through segmented pulse compression or narrowband filtering. Therefore, based on the traditional uniform intermittent sampling and forwarding interference, the study of non-uniform intermittent sampling and forwarding interference has become a new research hotspot. Traditional intermittent sampling and forwarding interference samples the radar signal with a fixed width, then forwards it according to a fixed number, and then samples and forwards it until the signal ends; while non-uniform intermittent sampling and forwarding interference samples the radar signal with a random length and forwards it with a random number, making it difficult for the radar to perceive accurately.

[0003] Traditional radar jamming systems mostly use discrete digital-to-analog and analog-to-digital converter devices, and the main control and processing architecture is implemented using the FPGA (Field-Programmable Gate Array) + DSP (Digital Signal Processor) architecture. The jamming systems implemented in this way are often large in size and high in power consumption. In addition, the discrete ADC (Analog-to-Digital Converter) and DAC (Digital-to-Analog Converter) require a high-speed serial interface to communicate with the FPGA, and such a high-speed interface often cannot meet the requirements in some scenarios with high latency requirements. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a non-uniform intermittent sampling interference method, device and equipment based on RFSoC.

[0005] According to a first aspect of an embodiment of the present invention, a non-uniform intermittent sampling interference method based on RFSoC is provided, the method comprising:

[0006] Obtaining the sub-pulse width of the intercepted intra-pulse frequency coded radar signal;

[0007] Obtaining target interference parameters according to the constraint formula and the sub-pulse width;

[0008] Sampling, forwarding and modulating according to the target interference parameter to obtain a non-uniform intermittent sampling and forwarding interference signal;

[0009] The non-uniform intermittent sampling forwarding interference signal is subjected to RFSoC interpolation and mixing processing to interfere with the radar.

[0010] Optionally, the constraint formula is expressed as follows:

[0011]

[0012] Wherein, s represents the number of acquisitions of the intra-pulse frequency coded radar signal, T p represents the sub-pulse width, T Js represents the starting time of the sth acquisition, t s Indicates the sampling duration of the sth acquisition, n s Indicates the number of forwarding times.

[0013] Optionally, obtaining a target interference parameter according to a constraint formula and the sub-pulse width includes:

[0014] Constraining interference parameters according to the constraint formula to obtain initial interference parameters that meet preset constraint conditions;

[0015] Obtaining multiple groups of different initial interference parameters according to the sub-pulse widths;

[0016] The multiple groups of different initial interference parameters are screened according to preset screening conditions to obtain the target interference parameters.

[0017] Optionally, the sampling, forwarding and modulating according to the target interference parameter to obtain a non-uniform intermittent sampling and forwarding interference signal includes:

[0018] When it is detected that the detection level signal is pulled high, the intra-pulse frequency coded radar signal is sampled according to the input sampling length, and the sampled signal is written into the BRAM;

[0019] The sampling signal in the BRAM is cyclically read according to the number of sampling points until the set forwarding times are reached to obtain the non-uniform intermittent sampling forwarding interference signal.

[0020] Optionally, the cyclically reading the sampling signal in the BRAM according to the number of sampling points until a set forwarding number is reached to obtain the non-uniform intermittent sampling forwarding interference signal includes:

[0021] Dividing the sampled signal into a plurality of segments of signals in a modulation area and a plurality of segments of signals in a non-modulation area;

[0022] When the sampling signal is read cyclically according to the number of sampling points, the phases of the multiple segments of signals in the modulation area are flipped 180°, and the phases of the multiple segments of signals in the non-modulation area are kept unchanged until the set number of forwarding times is reached, thereby obtaining the non-uniform intermittent sampling forwarding interference signal.

[0023] Optionally, after cyclically reading the sampling signal in the BRAM according to the number of sampling points until a set forwarding number is reached to obtain the non-uniform intermittent sampling forwarding interference signal, the method further includes:

[0024] Using a pseudo-random code generated by a linear feedback shift register as a random number;

[0025] A set of target interference parameters is selected according to the random number, and the set of target interference parameters is updated after the sampling signal is read cyclically each time according to the number of sampling points.

[0026] According to a second aspect of an embodiment of the present invention, a non-uniform intermittent sampling interference device based on RFSoC is provided, the device comprising:

[0027] A pulse width acquisition module, used to acquire the sub-pulse width of the intercepted intra-pulse frequency coded radar signal;

[0028] A parameter acquisition module, used to obtain target interference parameters according to a constraint formula and the sub-pulse width;

[0029] An interference signal acquisition module, used for sampling, forwarding and modulating according to the target interference parameter to obtain a non-uniform intermittent sampling and forwarding interference signal;

[0030] The interference module is used to interfere with the radar after the non-uniform intermittent sampling forwarding interference signal is processed by RFSoC interpolation and mixing.

[0031] According to a third aspect of an embodiment of the present disclosure, there is provided an electronic device, comprising: a processor; a memory for storing instructions executable by the processor;

[0032] The processor is configured to: execute the executable instructions to implement the steps of the non-uniform intermittent sampling interference method based on RFSoC as described in any one of the embodiments of the first aspect above.

[0033] The technical solution provided by the present invention may include the following beneficial effects:

[0034] Through the above technical solution, RFSoC devices are used, the interference method has low power consumption and good real-time performance, and by constraining the interference parameters, a low-complexity and high-real-time method is used to achieve non-uniform intermittent sampling forwarding interference, which reduces the complexity of the method while improving the interference efficiency and stability of the non-uniform intermittent sampling forwarding interference, and has a good interference effect.

[0035] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0037] Figure 1 The invention is a flow chart showing a non-uniform intermittent sampling interference method based on RFSoC according to an exemplary embodiment.

[0038] Figure 2 The diagram is a time domain schematic diagram showing non-uniform intermittent sampling forwarding interference according to an exemplary embodiment.

[0039] Figure 3 It is a simulation diagram of non-uniform intermittent sampling forwarding interference without modulation according to an exemplary embodiment.

[0040] Figure 4 1 is an interference effect diagram after target interference parameter constraints and two-phase modulation according to an exemplary embodiment.

[0041] Figure 5 It is a block diagram of a non-uniform intermittent sampling interference device based on RFSoC according to an exemplary embodiment.

[0042] Figure 6 The invention is a block diagram of an electronic device for a non-uniform intermittent sampling interference method based on RFSoC according to an exemplary embodiment. DETAILED DESCRIPTION

[0043] In order to facilitate the understanding of the scheme of the present invention, the relevant state of the prior art and the inventive concept of the present invention are first briefly described.

[0044] In a paper published by a scholar titled "Design and Implementation of Broadband High-Sensitivity Reconnaissance and Jamming Integrated Equipment", it is proposed to use an FPGA+DSP structure to design a jamming system. Although it combines the respective advantages of FPGA and DSP, and the performance indicators meet the requirements in most confrontation scenarios, the FPGA+DSP architecture inevitably has a large amount of inter-chip and inter-board interactions. The use of discrete devices to implement a multi-channel jammer will inevitably increase the size of the system. The communication between FPGA and discrete devices is often difficult to meet the requirements in some scenarios with high real-time requirements.

[0045] Other scholars have also disclosed "a method for non-uniform intermittent sampling interference of radar signals". This method effectively improves the shortcomings of traditional intermittent sampling interference, enhances the interference effect of intermittent sampling forwarding interference, and increases the difficulty of radar countermeasures. However, the algorithm is relatively complex, and it is difficult to achieve rapid convergence in some high-speed changing scenarios. Its real-time performance is difficult to guarantee, and it does not optimize the frequency domain coverage of the interference. It may result in sub-pulses and interference being too dispersed in the frequency domain, resulting in poor interference effect.

[0046] Therefore, the present invention proposes a non-uniform intermittent sampling interference method based on RFSoC to solve this technical problem.

[0047] Figure 1 is a flow chart showing a non-uniform intermittent sampling interference method based on RFSoC according to an exemplary embodiment. Figure 1 As shown, the method includes the following steps.

[0048] S101. Obtain a sub-pulse width of an intercepted intra-pulse frequency coded radar signal.

[0049] S102: Obtain target interference parameters according to the constraint formula and the sub-pulse width.

[0050] It can be understood that the target interference parameters of non-uniform intermittent sampling forwarding interference are constrained by constraint formulas so that the interference signal covers each sub-pulse of the echo signal and is close to the echo signal in the frequency domain; wherein the interference parameters include sampling duration and forwarding times.

[0051] Optionally, the constraint formula is expressed as follows:

[0052]

[0053] Where, s represents the number of acquisitions of the intra-pulse frequency-coded radar signal, T p represents the sub-pulse width, T Js represents the starting time of the sth acquisition, t s Indicates the sampling duration of the sth acquisition, n s Indicates the number of forwarding times; t s, n s is the radar parameter, whose receptor pulse width T p The constraint of each collection time and the corresponding forwarding times must satisfy the constraint relationship shown in the formula.

[0054] Optionally, S101 may include:

[0055] Constrain the interference parameters according to the constraint formula to obtain the initial interference parameters that meet the preset constraint conditions;

[0056] A plurality of different groups of initial interference parameters are obtained according to the sub-pulse width;

[0057] A plurality of different groups of initial interference parameters are screened according to preset screening conditions to obtain target interference parameters.

[0058] For example, after obtaining the initial interference parameters according to the constraint formula, the specific implementation process of screening the target interference parameters can be referred to as follows:

[0059] (1) Divide the obtained sub-pulse width by 3, 4, 5, and 6 respectively to obtain four different sampling durations and forwarding times (initial interference parameters). The sampling duration corresponding to 3 is the sub-pulse duration divided by 3, and the forwarding times is 2.

[0060] It can be understood that the intra-pulse forwarding of the radar signal divides the radar signal into several segments: the first collection, the first forwarding, the second collection, the second forwarding...; no collection is done during forwarding, that is, no matter how long the radar signal is collected, the collected signal is forwarded several times; the sub-pulse length is divided by 3, that is, a radar signal of 1 / 3 of the sub-pulse length is collected and forwarded twice, and divided by 4, that is, a radar signal of 1 / 4 of the length is collected and forwarded three times.

[0061] (2) Compare the obtained sampling duration with 1us, and retain the groups longer than 1us. If the number of groups longer than 1us is less than two, only the two groups of interference parameters with the largest sampling duration are retained as target interference parameters.

[0062] (3) On the PS side, the group number and target interference parameter corresponding to the target interference parameter are written into the BRAM (Block Random Access Memory) used for interaction between PL (Progarmmable Logic) and PS (Processing System).

[0063] S103 . Sampling, forwarding and modulating are performed according to the target interference parameter to obtain a non-uniform intermittent sampling and forwarding interference signal.

[0064] Optionally, S103 may include:

[0065] Sampling, forwarding and modulating are performed according to the target interference parameters to obtain a non-uniform intermittent sampling and forwarding interference signal, including:

[0066] When the detection level signal is detected to be pulled high, the intra-pulse frequency coded radar signal is sampled according to the input sampling length, and the sampled signal is written into the BRAM;

[0067] The sampling signal in the BRAM is read cyclically according to the number of sampling points until the set forwarding times are reached, thereby obtaining a non-uniform intermittent sampling forwarding interference signal.

[0068] Understandably, Figure 2 FIG. 1 is a time domain schematic diagram showing a non-uniform intermittent sampling forwarding interference according to an exemplary embodiment. Figure 2 As shown, the PL end uses the state machine to implement intermittent sampling and forwarding. It is mainly divided into three states, namely waiting state, sampling state and forwarding state. The initial state is the waiting state. The specific execution process is as follows:

[0069] ① Waiting state: when the detection level signal is detected to be high, it switches to the sampling state; otherwise, it remains in the waiting state;

[0070] ② Sampling state: When the detection signal is high, the radar signal is sampled according to the input sampling length, and the sampled signal is written to the BRAM. After the acquisition is completed, it switches to the forwarding state;

[0071] ③ Forwarding state: the sampling signal stored in the BRAM is read cyclically according to the number of sampling points until the set number of forwarding times is reached. When the detection signal is high, the switching state is the sampling state, otherwise it switches to the waiting state; among which, the number of sampling points is equal to the sampling time multiplied by the sampling rate.

[0072] Optionally, the sampling signal in the BRAM is cyclically read according to the number of sampling points until a set forwarding number is reached to obtain a non-uniform intermittent sampling forwarding interference signal, including:

[0073] The sampled signal is divided into a plurality of segments of signals in a modulation area and a plurality of segments of signals in a non-modulation area;

[0074] When the sampling signal is read cyclically according to the number of sampling points, the phases of multiple segments of signals in the modulation area are flipped 180°, and the phases of multiple segments of signals in the non-modulation area remain unchanged until the set number of forwarding times is reached, thereby obtaining a non-uniform intermittent sampling forwarding interference signal.

[0075] Understandably, reference Figure 2When reading the sampling signal in the BRAM, the read sampling signal is divided into several segments. When reading, the phase of the signal in the modulation area is flipped 180°, that is, its amplitude is changed from positive to negative, and negative to positive. This can be achieved by inverting the original data bit by bit and then adding 1; the phase of the signal in the non-modulation area remains unchanged. The non-uniform intermittent sampling forwarding interference signal is an interference signal that has been modulated by two phases.

[0076] Optionally, after cyclically reading the sampling signal in the BRAM according to the number of sampling points until a set forwarding number is reached to obtain a non-uniform intermittent sampling forwarding interference signal, the method may further include:

[0077] Using a pseudo-random code generated by a linear feedback shift register as a random number;

[0078] A set of target interference parameters is selected according to a random number, and the set of target interference parameters is updated after the sampling signal is read cyclically according to the number of sampling points each time.

[0079] It is understandable that a switching module can be used to use the pseudo-random code generated by the linear feedback shift register as a random number, select a set of sampling lengths and forwarding times from the parameter group, update the sampling duration and forwarding times after each sampling forwarding is completed, and leave a one-beat interval between the two consecutive sampling forwardings in the logic design, and update the sampling duration and forwarding times within the interval period; the sampling duration and forwarding times can be updated in the following way: define the interference parameters used for sampling forwarding as register types, and update them to a newly taken set of interference parameters after each sampling forwarding and before the next one.

[0080] For example, the system random number generator can be used to generate random numbers. The system random number generator can be generated using the rand function in the C++ standard library or the random_number_generator class provided by Vivado HLS.

[0081] S104, interpolating and mixing the non-uniform intermittent sampling forwarding interference signal through RFSoC to interfere with the radar.

[0082] It can be understood that after the non-uniform intermittent sampling forwarding interference signal is processed by RFSoC interpolation mixing, it can be amplified by the RF module and then transmitted by the antenna to interfere with the radar.

[0083] In one embodiment, Figure 3 This is a simulation diagram of non-uniform intermittent sampling forwarding interference without modulation according to an exemplary embodiment. It can be seen that although the interference can cover each sub-pulse, some sub-pulses are too far away from the interference signal in the frequency domain. Figure 4This is a diagram of interference effects after target interference parameter constraints and two-phase modulation according to an exemplary embodiment. It can be seen that the interference signal covers the radar signal in both the time domain and the frequency domain, and the interference signal has a strong correlation with the radar signal.

[0084] The present invention adopts RFSoC to realize interference, and has high system integration, low power consumption, reduces the delay caused by inter-board or inter-chip communication, and has a smaller system volume and better performance than using discrete ADC and DAC; and the method for determining interference parameters has low complexity, reduces the difficulty of technical development and has better real-time performance; while constraining the interference parameters, the interference signal is modulated in two phases, which effectively enhances the correlation between the interference signal and the radar signal in the time domain and the frequency domain, and the interference effect is better.

[0085] Figure 5 is a block diagram of a non-uniform intermittent sampling interference device based on RFSoC according to an exemplary embodiment. Figure 5 , the RFSoC-based non-uniform intermittent sampling interference device 500 may include:

[0086] The pulse width acquisition module 501 is used to acquire the sub-pulse width of the intercepted intra-pulse frequency coded radar signal;

[0087] A parameter acquisition module 502, used to obtain target interference parameters according to a constraint formula and a sub-pulse width;

[0088] The interference signal acquisition module 503 is used to sample, forward and modulate according to the target interference parameter to obtain a non-uniform intermittent sampling and forwarding interference signal;

[0089] The interference module 504 is used to interfere with the radar after the non-uniform intermittent sampling forwarding interference signal is processed by RFSoC interpolation and mixing.

[0090] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0091] Figure 6 is a block diagram of an electronic device for a non-uniform intermittent sampling interference method based on RFSoC according to an exemplary embodiment. Figure 6 As shown, the electronic device 600 may include: a processor 601 and a memory 602 .

[0092] Among them, the processor 601 is used to control the overall operation of the electronic device 600 to complete all or part of the steps in the above-mentioned non-uniform intermittent sampling interference method based on RFSoC. The memory 602 is used to store various types of data to support the operation of the electronic device 600, which may include, for example, instructions for any application or method for operating on the electronic device 600, and application-related data. The memory 602 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, referred to as EPROM), programmable read-only memory (Programmable Read-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, disk or optical disk.

[0093] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0094] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0095] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A non-uniform intermittent sampling interference method based on RFSoC, characterized in that: The method comprises: Obtaining the sub-pulse width of the intercepted intra-pulse frequency coded radar signal; Obtaining target interference parameters according to the constraint formula and the sub-pulse width; Sampling, forwarding and modulating according to the target interference parameter to obtain a non-uniform intermittent sampling and forwarding interference signal; The non-uniform intermittent sampling forwarding interference signal is subjected to RFSoC interpolation and mixing processing to interfere with the radar.

2. The non-uniform intermittent sampling interference method based on RFSoC according to claim 1 is characterized in that: The constraint formula is expressed as follows: Wherein, s represents the number of acquisitions of the intra-pulse frequency coded radar signal, T p represents the sub-pulse width, T Js represents the starting time of the sth acquisition, t s Indicates the sampling duration of the sth acquisition, n s Indicates the number of forwarding times.

3. The non-uniform intermittent sampling interference method based on RFSoC according to claim 1 is characterized in that: The obtaining of the target interference parameter according to the constraint formula and the sub-pulse width includes: Constraining interference parameters according to the constraint formula to obtain initial interference parameters that meet preset constraint conditions; Obtaining multiple groups of different initial interference parameters according to the sub-pulse widths; The multiple groups of different initial interference parameters are screened according to preset screening conditions to obtain the target interference parameters.

4. The non-uniform intermittent sampling interference method based on RFSoC according to claim 1 is characterized in that: The sampling, forwarding and modulating according to the target interference parameter to obtain a non-uniform intermittent sampling and forwarding interference signal includes: When it is detected that the detection level signal is pulled high, the intra-pulse frequency coded radar signal is sampled according to the input sampling length, and the sampled signal is written into the BRAM; The sampling signal in the BRAM is cyclically read according to the number of sampling points until the set forwarding times are reached to obtain the non-uniform intermittent sampling forwarding interference signal.

5. The non-uniform intermittent sampling interference method based on RFSoC according to claim 4 is characterized in that: The method of cyclically reading the sampling signal in the BRAM according to the number of sampling points until a set forwarding number is reached to obtain the non-uniform intermittent sampling forwarding interference signal includes: Dividing the sampled signal into a plurality of segments of signals in a modulation area and a plurality of segments of signals in a non-modulation area; When the sampling signal is read cyclically according to the number of sampling points, the phases of the multiple segments of signals in the modulation area are flipped 180°, and the phases of the multiple segments of signals in the non-modulation area are kept unchanged until the set number of forwarding times is reached, thereby obtaining the non-uniform intermittent sampling forwarding interference signal.

6. The non-uniform intermittent sampling interference method based on RFSoC according to claim 4 is characterized in that: After the sampling signal in the BRAM is cyclically read according to the number of sampling points until the set forwarding times are reached to obtain the non-uniform intermittent sampling forwarding interference signal, the method further includes: Using a pseudo-random code generated by a linear feedback shift register as a random number; A set of target interference parameters is selected according to the random number, and the set of target interference parameters is updated after the sampling signal is read cyclically each time according to the number of sampling points.

7. A non-uniform intermittent sampling interference device based on RFSoC, characterized in that: The device comprises: A pulse width acquisition module, used to acquire the sub-pulse width of the intercepted intra-pulse frequency coded radar signal; A parameter acquisition module, used to obtain target interference parameters according to a constraint formula and the sub-pulse width; An interference signal acquisition module, used for sampling, forwarding and modulating according to the target interference parameter to obtain a non-uniform intermittent sampling and forwarding interference signal; The interference module is used to interfere with the radar after the non-uniform intermittent sampling forwarding interference signal is processed by RFSoC interpolation and mixing.

8. An electronic device, characterized in that: include: processor; a memory for storing processor-executable instructions; The processor is configured to: execute the executable instructions to implement the steps of the RFSoC-based non-uniform intermittent sampling interference method according to any one of claims 1 to 6.

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