Modulation interference method and device for pseudo-random two-phase coded radar, electronic equipment and medium

Abstract

The invention discloses a modulation interference method and device for a pseudo-random two-phase coding radar, electronic equipment and a medium, and belongs to the technical field of radar interference. The method comprises the following steps: acquiring a plurality of radar signals through electronic reconnaissance, and establishing a radar carrier frequency list of the radar signals, a radar coding sequence list, an interference signal coding sequence list and a cross-correlation function main lobe information list of interference signal coding sequences and radar coding sequences; sampling a radar signal of a to-be-interfered object, and querying the radar carrier frequency list, the radar coding sequence list, the interference signal coding sequence list and the cross-correlation function main lobe information list of the interference signal coding sequence and the radar coding sequence based on a sampling result; and determining an interference signal carrier frequency and an interference signal phase coding sequence, and generating a modulation interference signal based on the interference signal carrier frequency and the interference signal phase coding sequence. According to the method, the effectiveness of pseudo-random two-phase coding radar interference is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of radar jamming, and in particular relates to a modulation jamming method, device, electronic device and medium for a pseudo-random binary coded radar. Background Art

[0002] The pseudo-random binary coded radar is a large time-bandwidth product radar adopting a pulse compression system. Due to its thumbtack-shaped ambiguity function, it has good anti-non-coherent jamming characteristics and is the simplest and most mature type of radar in the phase-coded pulse compression system radar. At present, the main jamming methods for pseudo-random binary coded radars are mainly coherent jamming, and the specific implementation methods are mainly divided into two categories. One is the intermittent sampling and forwarding jamming method based on digital radio frequency storage technology, and the other is the generative jamming method based on radar signal modulation characteristics. The intermittent sampling and forwarding jamming method based on digital radio frequency storage technology can be regarded as a passive jamming method, and is further divided into intermittent sampling direct forwarding jamming, intermittent sampling repeated forwarding jamming, non-uniform intermittent sampling and forwarding jamming, etc. according to different sampling intervals and forwarding times. Although the jamming signals generated by this type of method have strong correlation with radar signals, due to the time-sharing operation of sampling and forwarding and the forwarding always lagging behind a sampling interval, the discontinuity and lag of the jamming signals are caused, so that the generated trailing false target is easily recognized by the pulse front tracking technology during radar signal detection and cannot form a reliable and effective jamming. The generative jamming method based on radar signal modulation characteristics is an active jamming method, which mainly obtains the modulation information of radar signals through pre-electronic reconnaissance and directly generates jamming signals during jamming. This type of method overcomes the disadvantage of discontinuous jamming signals of intermittent sampling and forwarding, but due to the uncertainty of the radar modulation sequence, it is impossible to generate stable and strongly correlated jamming signals, and the jamming effect is poor. Therefore, on this basis, the modulation forwarding jamming based on prediction is developed. By real-time prediction, the correlation of the jamming signal is realized, and by selecting and recombining the prediction sequence, the leading false target jamming effect is realized, so that it cannot be recognized by the radar during the radar signal detection link and an effective jamming effect is achieved. However, the jamming effect of this method mainly depends on the accuracy and real-time performance of the prediction. The accuracy requires that the radar signals used for decoding must be error-free and the sampling length must reach the minimum length of the sequence that can be decoded. The real-time performance requires that the sampling duration cannot exceed the duration of radar pulse front tracking. Both conditions must be met to accurately decode and predict the generation of jamming signals to achieve an effective jamming effect. The harsh conditions make it difficult to accurately predict the pseudo-random binary coded radar signals by this jamming method, so that an effective jamming effect cannot be well realized and is limited in practical applications. Summary of the Invention

[0003] The present invention provides a method, device, electronic device and medium for modulating interference to a pseudo-random binary coded radar, aiming to solve the problem that it is difficult to ensure the accuracy and real-time performance of encoding sequence prediction in the generative interference method of pseudo-random binary coded radar based on radar signal modulation characteristics.

[0004] In the first aspect of the present invention, a method for modulating interference to a pseudo-random binary coded radar is provided. The method includes: Step S1: Obtain multiple radar signals through electronic reconnaissance, and establish a radar carrier frequency list of radar signals, a radar coding sequence list, an interference signal coding sequence list, and a main lobe information list of the cross-correlation function between the interference signal coding sequence and the radar coding sequence; Step S2: Sample the radar signal of the object to be interfered, query the radar carrier frequency list, radar coding sequence list, interference signal coding sequence list, and the main lobe information list of the cross-correlation function between the interference signal coding sequence and the radar coding sequence based on the sampling result, determine the interference signal carrier frequency and the interference signal phase coding sequence, and generate a modulation interference signal based on the interference signal carrier frequency and the interference signal phase coding sequence.

[0005] Preferably, in step S1, obtaining multiple radar signals through electronic reconnaissance and establishing a radar carrier frequency list of radar signals, a radar coding sequence list, an interference signal coding sequence list, and a main lobe information list of the cross-correlation function between the interference signal coding sequence and the radar coding sequence includes: Obtain multiple radar signals through electronic reconnaissance, obtain the modulation characteristics of each radar signal, and generate a radar carrier frequency list; For each radar signal: determine the candidate pseudo-random coding sequences that generate the radar signal, remove the candidate pseudo-random coding sequences whose autocorrelation sidelobe is greater than one-third of the main lobe amplitude, and use the remaining candidate pseudo-random coding sequences as the pseudo-random coding sequence of the radar signal; Construct a radar coding sequence list based on all the pseudo-random coding sequences of each radar signal; For each radar signal: based on the pulse width, code element width, and in-pulse phase coding signal of the radar signal, determine the shift register order and shift register connection method of the pseudo-random coding sequence that generates the radar signal, determine the pseudo-random coding sequences of different initial states of all connection methods at the same order of the shift register, and use the obtained sequences as the interference signal coding sequences of the radar signal; Construct an interference signal coding sequence list based on all the interference signal coding sequences of each radar signal; Determine the cross-correlation function of each interference signal coding sequence in the list of interference signal coding sequences and each pseudo-random coding sequence in the list of radar coding sequences; determine the main lobe of each cross-correlation function and the position where the main lobe is located, and determine the cross-correlation main lobe of each cross-correlation function and the time when the cross-correlation main lobe is located based on the main lobe of each cross-correlation function and the position where the main lobe is located; construct a list of main lobe information of the cross-correlation function between the interference signal coding sequence and the radar coding sequence based on the cross-correlation main lobes of all cross-correlation functions and the times when the cross-correlation main lobes are located.

[0006] Preferably, determining the candidate pseudo-random coding sequence for generating the radar signal includes: Determine the in-pulse modulation sequence of the radar signal; If the accuracy of the in-pulse modulation sequence of the radar signal is greater than or equal to a preset threshold, determine the shift register order and shift register connection mode of the pseudo-random coding sequence for generating the radar signal based on the in-pulse modulation sequence of the radar signal, and calculate the autocorrelation function of the radar signal corresponding to each initial state under the shift register connection mode; determine the set of possible pseudo-random coding sequences that the radar signal may adopt according to the relationship between the main lobe and sidelobe of the autocorrelation function, and use the pseudo-random coding sequences in the set of pseudo-random coding sequences as the candidate pseudo-random coding sequences of the radar signal; If the accuracy of the in-pulse modulation sequence of the radar signal is less than the preset threshold, determine all the shift registers that may generate the pseudo-random coding sequence of the radar signal; determine all the connection modes of each shift register, determine all the sub-sequences of the pseudo-random coding sequence corresponding to each connection mode of each shift register, and the number of sub-sequences of the pseudo-random coding sequence corresponding to each initial state is related to the shift register order; calculate the autocorrelation function of the radar signal corresponding to each sub-sequence of the pseudo-random coding sequence; determine the pseudo-random coding sequence corresponding to each autocorrelation function of the radar signal, and use the pseudo-random coding sequence as the candidate pseudo-random coding sequence.

[0007] Preferably, the formula for determining the shift register connection mode of the pseudo-random coding sequence for generating the radar signal based on the in-pulse modulation sequence of the radar signal is:

[0008] where the summation is performed according to modulo-two arithmetic, is the i-th code element coding value of the pseudo-random coding sequence of the radar signal, taking values of 0 or 1, and i represents the position of the in-pulse modulation code element, is the (i - p)-th code element coding value of the pseudo-random coding sequence of the radar signal, is the pseudo-random coding sequence of the radar signal, and It is the p-th parameter value of the shift register connection method, with a value of 0 or 1. When taking 1, it participates in the operation; when taking 0, it does not participate in the operation. p is the order of the shift register connection parameter, and k is the order of the shift register, which is determined by the logarithm of the ratio of the pulse width to the symbol width; The calculation formula for the autocorrelation function of the radar signal is:

[0009] Among them, is the pseudo-random coding sequence of the radar signal and is the correlation function value of the pseudo-random coding sequence after j shifts, that is, the difference between the number of the same corresponding elements and the number of different corresponding elements. n is the length of the pseudo-random coding sequence; is the pseudo-random coding sequence of the radar signal The i + j-th symbol coding value of, taking a value of 0 or 1.

[0010] Preferably, determine the cross-correlation function of each interference signal coding sequence in the interference signal coding sequence list and each pseudo-random coding sequence in the radar coding sequence list, where the calculation formula for the cross-correlation function is:

[0011] Among them, is the pseudo-random coding sequence of the radar signal and is the cross-correlation function value of the interference signal coding sequence after j shifts , is the coding value of the i-th symbol of the interference signal coding sequence.

[0012] Preferably, the step S2 includes: Query the radar carrier frequency list based on the sampling result to determine the interference signal carrier frequency closest to the sampling result frequency; Query the radar coding sequence list based on the sampling result to determine several sequences with the same number of digits as the sampling result as the candidate radar coding sequences corresponding to the sampling result; For each candidate radar coding sequence, query the main lobe information list of the cross-correlation function between the interference signal coding sequence and the radar coding sequence to determine the sequence number corresponding to the maximum value of the minimum of the cross-correlation main lobe with the candidate radar coding sequence; use this sequence number as the interference sequence number; For each interference sequence number, query the interference signal coding sequence list based on this interference sequence number to obtain the interference signal coding sequence corresponding to this interference sequence number, and use this interference signal coding sequence as the interference signal phase coding sequence; Generate a modulated interference signal based on the interference signal carrier frequency and the interference signal phase coding sequence.

[0013] In a second aspect of the present invention, a modulation interference device for a pseudo-random binary coded radar is proposed. The device includes: A list construction module: configured to obtain multiple radar signals through electronic reconnaissance, and establish a radar carrier frequency list of radar signals, a radar coding sequence list, an interference signal coding sequence list, and a main lobe information list of the cross-correlation function between the interference signal coding sequence and the radar coding sequence; A query module: configured to sample the radar signal of the object to be interfered with, query the radar carrier frequency list, the radar coding sequence list, the interference signal coding sequence list, and the main lobe information list of the cross-correlation function between the interference signal coding sequence and the radar coding sequence based on the sampling result, determine the interference signal carrier frequency and the interference signal phase coding sequence, and generate a modulation interference signal based on the interference signal carrier frequency and the interference signal phase coding sequence.

[0014] In a third aspect of the present invention, an electronic device is provided. The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method as described above.

[0015] In a fourth aspect of the present invention, a non-transitory computer-readable storage medium storing computer instructions is provided, and the computer instructions are used to cause the computer to execute the method as described above.

[0016] The present invention utilizes prior electronic reconnaissance to obtain the radar signal carrier frequency and the in-pulse coding modulation characteristics. By identifying the order and connection mode of the coding sequence shift register, based on the pseudo-random sequence generation principle, an interference pseudo-random coding sequence list strongly correlated with the radar signal coding sequence and an interference carrier frequency list are established. During interference implementation, the radar signal is quickly sampled, and then the modulation information of the interference signal coding sequence is obtained by means of table lookup or random selection, so as to generate a coherent interference signal and transmit it, achieving effective interference against the pseudo-random binary coded radar.

[0017] The present invention has the following technical effects: (1) The coherent interference method of the present invention for pseudo-random binary coded radar is oriented to the actual engineering application. Aiming at the problem that the sequence is difficult to accurately predict in real time, real-time continuous interference signal generation is realized, and a deception interference effect of leading false targets or a strong coherent suppression interference effect similar to noise can be generated. The effectiveness of interfering with pseudo-random binary coded radar is greatly improved.

[0018] (2) The present invention belongs to a generative interference method based on radar signal modulation characteristics. Through prior electronic reconnaissance and sequence correlation characteristic analysis, the sequence prediction problem in the interference process is transformed into a rule-based sequence selection problem, solving the problem that the correlation between the interference sequence and the radar sequence in the generative interference method based on radar signal modulation characteristics highly depends on the real-time performance and accuracy of the decoding algorithm.

[0019] (3) Based on the results of statistical characteristic analysis, the present invention ensures that the selected pseudo-random sequence has, in a statistical sense, the minimum value of the maximum of the main lobe of the cross-correlation function with the radar sequence. According to whether the shift register connection mode is the same as or different from that of the radar, it is not less than 1 / 2 and 1 / 3 of the main lobe of the radar sequence's autocorrelation respectively, ensuring the correlation of the interference signal.

[0020] (4) The present invention does not require the sampling duration to necessarily reach the prediction duration. It ensures that the selected pseudo-random sequence, after truncation and recombination, has, in a statistical sense, a lead amount in the main lobe of the cross-correlation function with the radar sequence that is ahead of the main lobe of the autocorrelation function of the radar coding sequence by a certain duration, ensuring the interference effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic flowchart of the modulation interference method for pseudo-random binary coded radar provided by the present invention; Figure 2 It is a schematic diagram of the generation sequence of various sequence lists related to the present invention; Figure 3 It is a schematic diagram of the structure of the radar coding sequence list of the present invention; Figure 4 It is a schematic diagram of the structure of the interference signal coding sequence list of the present invention; Figure 5 It is a schematic diagram of the structure of the main lobe information list of the cross-correlation function of the present invention; Figure 6 It is a schematic diagram of the look-up table sequence for generating the interference signal of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

[0023] As Figure 1 shown, the method includes: Step S1: Obtain multiple radar signals through electronic reconnaissance, and establish a radar carrier frequency list, a radar coding sequence list, a jamming signal coding sequence list, and a list of the main lobe information of the cross-correlation function between the jamming signal coding sequence and the radar coding sequence for the radar signals. Step S2: Sample the radar signals of the object to be jammed, query the radar carrier frequency list, the radar coding sequence list, the jamming signal coding sequence list, and the list of the main lobe information of the cross-correlation function between the jamming signal coding sequence and the radar coding sequence based on the sampling results, determine the jamming signal carrier frequency and the jamming signal phase coding sequence, and generate a modulated jamming signal based on the jamming signal carrier frequency and the jamming signal phase coding sequence.

[0024] As Figures 2 - 5 shown, obtain multiple radar signals through electronic reconnaissance, obtain the modulation characteristics of each radar signal, and generate a radar carrier frequency list F_list.

[0025] For each radar signal: Determine the candidate pseudo-random coding sequences that generate the radar signal, remove the candidate pseudo-random coding sequences whose autocorrelation sidelobes are greater than one-third of the main lobe amplitude, and use the remaining candidate pseudo-random coding sequences as the pseudo-random coding sequences of the radar signal. Construct a radar coding sequence list R_sequencelist based on all the pseudo-random coding sequences of each radar signal.

[0026] For each radar signal: Based on the pulse width, code element width, and in-pulse phase coding signal of the radar signal, determine the shift register order and shift register connection method for generating the pseudo-random coding sequence of the radar signal, and determine the pseudo-random coding sequences with different initial states for all connection methods at the same order of the shift register as the jamming signal coding sequences of the radar signal. Construct a jamming signal coding sequence list J_sequencelist based on all the jamming signal coding sequences of each radar signal.

[0027] Determine the cross-correlation function between each jamming signal coding sequence in the jamming signal coding sequence list and each pseudo-random coding sequence in the radar coding sequence list; determine the main lobe and the position of the main lobe of each cross-correlation function, and determine the cross-correlation main lobe and the time when the cross-correlation main lobe is located based on the main lobe and the position of the main lobe of each cross-correlation function; construct a list of the main lobe information of the cross-correlation function between the jamming signal coding sequence and the radar coding sequence Cmax_correlationlist based on the cross-correlation main lobes and the times when the cross-correlation main lobes are located of all the cross-correlation functions.

[0028] Further, determining the candidate pseudo-random coding sequences that generate the radar signal includes: Determine the in-pulse modulation sequence of the radar signal. If the accuracy of the in-pulse modulation sequence of the radar is greater than or equal to a preset threshold, then determine the shift register order and the shift register connection mode of the pseudo-random coding sequence for generating the radar signal based on the in-pulse modulation sequence of the radar, and calculate the autocorrelation function of the radar signal corresponding to each initial state under the shift register connection mode; determine the set of possible pseudo-random coding sequences that each radar signal may adopt according to the relationship between the main lobe and the side lobe of the autocorrelation function, and use the pseudo-random coding sequences in the set of pseudo-random coding sequences as the candidate pseudo-random coding sequences of the radar signal; If the accuracy of the in-pulse modulation sequence of the radar is less than the preset threshold, then determine all the shift registers that may generate the pseudo-random coding sequence of the radar signal; determine all the connection modes of each shift register, and determine all the sub-sequences of the pseudo-random coding sequence corresponding to each initial state of each connection mode of each shift register. The number of sub-sequences of the pseudo-random coding sequence corresponding to each initial state is related to the shift register order; calculate the autocorrelation function of the radar signal corresponding to each sub-sequence of the pseudo-random coding sequence; determine the pseudo-random coding sequence corresponding to each autocorrelation function of the radar signal, and use the pseudo-random coding sequence as the candidate pseudo-random coding sequence.

[0029] Further, the shift register order and the shift register connection mode of the pseudo-random coding sequence for generating the radar signal are determined based on the in-pulse modulation sequence of the radar. Among them, the formula for determining the shift register connection mode is:

[0030] In the formula, the summation is performed according to modulo-two operation, is the coding value of the i-th symbol of the pseudo-random coding sequence of the radar signal, taking values of 0 or 1, and i represents the position of the in-pulse modulation symbol, is the coding value of the (i - p)-th symbol of the pseudo-random coding sequence of the radar signal, is the p-th parameter value of the shift register connection mode, taking values of 0 or 1. When taking 1, it participates in the operation, and when taking 0, it does not participate in the operation. p is the order of the shift register connection parameter, and k is the shift register order, which is determined by the logarithm of the ratio of the pulse width to the symbol width; is the coding value of the (i - p)-th symbol of the pseudo-random coding sequence of the radar signal, is the p-th parameter value of the shift register connection mode, taking values of 0 or 1. When taking 1, it participates in the operation, and when taking 0, it does not participate in the operation. p is the order of the shift register connection parameter, and k is the shift register order, which is determined by the logarithm of the ratio of the pulse width to the symbol width; The calculation formula of the autocorrelation function of the radar signal is:

[0031] Among them, is the correlation function value of the pseudo-random coding sequence and of the radar signal after j times of shifting, that is, the difference between the number of corresponding identical elements and the number of corresponding different elements. n is the length of the pseudo-random coding sequence; is the coding value of the (i + j)-th symbol of the pseudo-random coding sequence of the radar signal, taking values of 0 or 1.

[0032] In the present invention, after determining the connection mode of the shift register, all pseudo-random coding sequences with a length of can be generated.

[0033] Furthermore, the cross-correlation function of each interference signal coding sequence in the interference signal coding sequence list and each pseudo-random coding sequence in the radar coding sequence list is determined. The calculation formula of the cross-correlation function is:

[0034] where is the pseudo-random coding sequence of the radar signal and is the cross-correlation function value of the interference signal coding sequence after j shifts , is the coding value of the i-th symbol of the interference signal coding sequence.

[0035] In the present invention, the cross-correlation main lobe of the cross-correlation function and the time when the cross-correlation main lobe is located are combined into a tuple and stored in Cmax_correlationlist.

[0036] As Figure 6 shown, the step S2 includes: Querying the radar carrier frequency list based on the sampling result to determine the interference signal carrier frequency closest to the sampling result frequency; Querying the radar coding sequence list based on the sampling result to determine several sequences with the same number of digits as the sampling result as the candidate radar coding sequences corresponding to the sampling result; For each candidate radar coding sequence, querying the cross-correlation function main lobe information list of the interference signal coding sequence and the radar coding sequence to determine the sequence number corresponding to the maximum value of the minimum value of the cross-correlation main lobe with the candidate radar coding sequence; taking this sequence number as the interference sequence number; For each interference sequence number, querying the interference signal coding sequence list based on this interference sequence number to obtain the interference signal coding sequence corresponding to this interference sequence number, and taking this interference signal coding sequence as the interference signal phase coding sequence; Generating a modulated interference signal based on the interference signal carrier frequency and the interference signal phase coding sequence.

[0037] Furthermore, when querying the cross-correlation function main lobe information list of the interference signal coding sequence and the radar coding sequence, when only considering the correlation, the sequence number corresponding to the maximum value of the minimum value of the cross-correlation main lobe with the candidate radar coding sequence is selected; when also considering the false target interference effect, the sequence number corresponding to the maximum value of the minimum value of the cross-correlation main lobe at the time of the leading position of the cross-correlation main lobe of the candidate radar coding sequence is selected.

[0038] The present invention identifies modulation parameters of the acquired radar signal to obtain estimated values of intra-pulse parameters and inter-pulse parameters; based on the principle of pseudo-random sequence generation, reversely calculates the order and connection mode of the coding sequence generator; generates a pseudo-random coding sequence table of the radar signal according to the information of the order and connection mode of the sequence generator and the autocorrelation characteristics of the sequence; calculates the pseudo-random sequences generated by sequence generators with different connection modes at the same order, calculates the correlation characteristics between the generated pseudo-random sequences and all sequences in the pseudo-random coding sequence table of the radar signal, and screens out the sequences with strong correlation characteristics and stores them in the pseudo-random coding sequence table of the interference signal; according to the modulation parameters of the radar single sampling width signal captured in real time, selects the interference frequency and interference coding sequence according to the corresponding criteria, generates an interference signal and transmits it.

[0039] In the present invention, the coding sequence of the radar sampling signal is configured as , with a total of 4 bits, and there are three cases: (1) The connection mode of the radar shift register is known, and the initial state of the radar coding sequence can be obtained by sampling. In this case, using the initial state and the shift register connection coefficient, the radar signal sequence can be directly generated, and the interference sequence can be selected from the J_list generated by the same shift register structure according to the preset interference pattern. (2) The connection mode of the shift register is known, but the initial state of the radar coding sequence cannot be accurately obtained from the sampling signal. In this case, according to the limited coding obtained by sampling, any one of several sequences whose first few bits are the same as the sampling coding is selected from the J_list generated by the same shift register structure, or a sequence can be randomly selected directly from the J_list generated by the same shift register structure, and the strategy can be adjusted according to the interference effect. (3) The connection mode of the shift register is unknown. In this case, according to the limited coding obtained by sampling, the R_sequencelist table is searched to obtain multiple possible radar coding sequences, and the interference sequence corresponding to the maximum value of the minimum value of the main lobe of the cross-correlation function between any interference sequence in the Cmax_correlationlist and all possible radar sequences is found. As Figure 5 In it, assuming that the possible sequences of the radar coding are R1, R2, R3, and the complete set of interference sequences is J1, J2, then the minimum value of the main lobe of the cross-correlation function between the interference sequence J1 and R1, R2, R3 and its position are (15, 6), and the minimum value of the main lobe of the cross-correlation function between the interference sequence J2 and R1, R2, R3 and its position are (11, 5), then the maximum value of the minimum value of the main lobe of the cross-correlation function between the interference sequence and all possible radar sequences is 15; the corresponding interference sequence is selected as J1.

[0040] The following describes the device for implementing the present invention. For its specific implementation process and technical effects, refer to the above, and the following will not be repeated.

[0041] Optionally, an embodiment of the present invention provides a modulation interference device for a pseudo-random binary coding radar, and the device includes: List construction module: Configured to obtain multiple radar signals through electronic reconnaissance, and establish a radar carrier frequency list of radar signals, a radar coding sequence list, a jamming signal coding sequence list, and a main lobe information list of the cross-correlation function between the jamming signal coding sequence and the radar coding sequence; Query module: Configured to sample the radar signals of the object to be jammed, query the radar carrier frequency list, radar coding sequence list, jamming signal coding sequence list, and the main lobe information list of the cross-correlation function between the jamming signal coding sequence and the radar coding sequence based on the sampling results, determine the jamming signal carrier frequency and the jamming signal phase coding sequence, and generate a modulated jamming signal based on the jamming signal carrier frequency and the jamming signal phase coding sequence.

[0042] The above device is used to execute the method provided in the foregoing embodiment, and its implementation principle and technical effects are similar, and will not be elaborated here.

[0043] The above modules may be one or more integrated circuits configured to implement the above method, for example: one or more application specific integrated circuits (ASICs), or, one or more microprocessors (digital singnal processors, DSPs for short), or, one or more field programmable gate arrays (Field Programmable Gate Arrays, FPGAs for short), etc. Again, when a certain module above is implemented in the form of a processing element dispatching program code, the processing element may be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU for short) or other processors that can call program code. Again, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC for short).

[0044] The above modules may be connected or communicate with each other via wired connections or wireless connections. Wired connections may include metal cables, optical cables, hybrid cables, etc., or any combination thereof. Wireless connections may include connections in the form of LAN, WAN, Bluetooth, ZigBee, or NFC, etc., or any combination thereof. Two or more modules may be combined into a single module, and any one module may be divided into two or more units. Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems and devices described above may refer to the corresponding processes in the method embodiments, and will not be elaborated in the present invention.

[0045] It should be noted that the above modules may be one or more integrated circuits configured to implement the above methods. For example, one or more application specific integrated circuits (ASICs), or one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs), etc. Again, when a certain module above is implemented in the form of a processing element scheduler code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processors that can call program code. Again, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0046] The electronic device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the electronic device is used to communicate with an external terminal in a wired or wireless manner. The wireless manner can be implemented through WIFI, a carrier network, near field communication (NFC), or other technologies. The display screen of the electronic device can be a liquid crystal display screen or an electronic ink display screen. The input device of the electronic device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the housing of the electronic device, or an external keyboard, a touchpad, or a mouse, etc.

[0047] The present invention also provides a program product, such as a computer-readable storage medium, including a program that is used to execute the above method embodiments when executed by a processor.

[0048] In several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections with each other may be through some interfaces. The indirect couplings or communication connections of devices or units may be in electrical, mechanical, or other forms.

[0049] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or distributed over multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0050] In addition, in each embodiment of the present invention, each functional unit may be integrated in a processing unit, may exist separately as individual physical units, or two or more units may be integrated in one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a hardware plus software functional unit.

[0051] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit stored in a storage medium includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to execute some steps of the methods described in each embodiment of the present invention. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (English: Read-Only Memory, abbreviated as: ROM), a random access memory (English: Random Access Memory, abbreviated as: RAM), a magnetic disk, or an optical disc that can store program codes.

Claims

1. A method for modulating interference to a pseudo-random binary coded radar, characterized in that, The method includes the following steps: Step S1: Obtain multiple radar signals through electronic reconnaissance, and establish a radar carrier frequency list of the radar signals, a radar coding sequence list, an interference signal coding sequence list, and a main lobe information list of the cross-correlation function between the interference signal coding sequence and the radar coding sequence; Step S2: Sample the radar signals of the object to be jammed, query the radar carrier frequency list, the radar coding sequence list, the interference signal coding sequence list, and the main lobe information list of the cross-correlation function between the interference signal coding sequence and the radar coding sequence based on the sampling results, determine the interference signal carrier frequency and the interference signal phase coding sequence, and generate a modulated interference signal based on the interference signal carrier frequency and the interference signal phase coding sequence.

2. The method according to claim 1, wherein The Step S1, obtaining multiple radar signals through electronic reconnaissance, and establishing a radar carrier frequency list of the radar signals, a radar coding sequence list, an interference signal coding sequence list, and a main lobe information list of the cross-correlation function between the interference signal coding sequence and the radar coding sequence, includes: Obtain multiple radar signals through electronic reconnaissance, obtain the modulation characteristics of each radar signal, and generate a radar carrier frequency list; For each radar signal: Determine the candidate pseudo-random coding sequences that generate the radar signal, remove the candidate pseudo-random coding sequences whose autocorrelation sidelobes are greater than one-third of the main lobe amplitude, and use the remaining candidate pseudo-random coding sequences as the pseudo-random coding sequence of the radar signal; Construct a radar coding sequence list based on all the pseudo-random coding sequences of each radar signal; For each radar signal: Based on the pulse width, code element width, and in-pulse phase coding signal of the radar signal, determine the shift register order and shift register connection method of the pseudo-random coding sequence that generates the radar signal, determine the pseudo-random coding sequences of different initial states of all connection methods at the same order of the shift register, and use the obtained sequences as the interference signal coding sequences of the radar signal; Construct an interference signal coding sequence list based on all the interference signal coding sequences of each radar signal; Determine the cross-correlation function between each interference signal coding sequence in the interference signal coding sequence list and each pseudo-random coding sequence in the radar coding sequence list; Determine the main lobe and the position of the main lobe of each cross-correlation function, and determine the cross-correlation main lobe and the time of the cross-correlation main lobe of each cross-correlation function based on the main lobe and the position of the main lobe of each cross-correlation function; Construct a main lobe information list of the cross-correlation function between the interference signal coding sequence and the radar coding sequence based on the cross-correlation main lobes and the times of the cross-correlation main lobes of all cross-correlation functions.

3. The method according to claim 2, characterized in that Determining the candidate pseudo-random coding sequences that generate the radar signal includes: Determine the in-pulse modulation sequence of the radar signal; If the accuracy of the radar intra-pulse modulation sequence is greater than or equal to a preset threshold, then determine the shift register order and the shift register connection mode of the pseudo-random coding sequence for generating the radar signal based on the radar intra-pulse modulation sequence, and calculate the radar signal autocorrelation function corresponding to each initial state under this shift register connection mode; determine the set of possible pseudo-random coding sequences for each radar signal according to the relationship between the main lobe and the side lobe of the autocorrelation function, and use the pseudo-random coding sequences in the set of pseudo-random coding sequences as the candidate pseudo-random coding sequences of the radar signal; If the accuracy of the radar intra-pulse modulation sequence is less than the preset threshold, then determine all the shift registers that may generate the pseudo-random coding sequence of the radar signal; determine all the connection modes of each shift register, and determine all the sub-sequences of the pseudo-random coding sequence corresponding to each initial state of each connection mode of each shift register. The number of sub-sequences of the pseudo-random coding sequence corresponding to each initial state is related to the shift register order; calculate the radar signal autocorrelation function corresponding to each sub-sequence of the pseudo-random coding sequence; determine the pseudo-random coding sequence corresponding to each radar signal autocorrelation function, and use the pseudo-random coding sequence as the candidate pseudo-random coding sequence.

4. The method according to claim 3, characterized in that, The formula for determining the shift register connection mode of the pseudo-random coding sequence for generating the radar signal based on the radar intra-pulse modulation sequence is: ； wherein, the summation is performed according to modulo-two operation, is the i-th symbol coding value of the radar signal pseudo-random coding sequence taking values of 0 or 1, where i represents the position of the in-pulse modulation symbol, is the (i - p)-th symbol coding value of the radar signal pseudo-random coding sequence and is the p-th parameter value of the shift register connection mode, taking values of 0 or 1, participating in the operation when taking 1 and not participating in the operation when taking 0, p is the order of the shift register connection parameter, and k is the order of the shift register, which is determined by the logarithm of the ratio of the pulse width to the symbol width; The calculation formula for the radar signal autocorrelation function is: ； Among them, is the pseudo-random coding sequence of the radar signal and is the correlation function value of the pseudo-random coding sequence after j shifts, that is, the difference between the number of corresponding identical elements and the number of corresponding different elements, and n is the length of the pseudo-random coding sequence; is the pseudo-random coding sequence of the radar signal is the coding value of the (i + j)-th symbol of , taking values of 0 or 1.

5. The method according to claim 4, wherein Determine the cross-correlation function between each interference signal coding sequence in the interference signal coding sequence list and each pseudo-random coding sequence in the radar coding sequence list, where the calculation formula for the cross-correlation function is: ； Among them, is the pseudo-random coding sequence of the radar signal and is the coding sequence of the interference signal after j times of shifting is the cross-correlation function value, is the coding value of the i-th symbol of the interference signal coding sequence.

6. The method according to claim 3, characterized in that, The step S2 includes: Query the radar carrier frequency list based on the sampling result to determine the interference signal carrier frequency closest to the sampling result frequency; Query the radar coding sequence list based on the sampling result to determine several sequences with the same number of bits as the sampling result as the candidate radar coding sequences corresponding to the sampling result; For each candidate radar coding sequence, query the cross-correlation function main lobe information list of the interference signal coding sequence and the radar coding sequence to determine the sequence number corresponding to the maximum value of the minimum of the cross-correlation main lobe with the candidate radar coding sequence; use this sequence number as the interference sequence number; For each interference sequence number, query the interference signal coding sequence list based on this interference sequence number to obtain the interference signal coding sequence corresponding to this interference sequence number, and use this interference signal coding sequence as the interference signal phase coding sequence; Generate a modulated interference signal based on the interference signal carrier frequency and the interference signal phase coding sequence.

7. A modulation interference device for a pseudo-random binary coded radar, characterized in that, The device includes: A list construction module: configured to obtain multiple radar signals through electronic reconnaissance and establish a radar carrier frequency list, a radar coding sequence list, an interference signal coding sequence list, and a cross-correlation function main lobe information list of the interference signal coding sequence and the radar coding sequence of the radar signal; Query module: Configured to sample the radar signals of the objects to be interfered, query the radar carrier frequency list, radar coding sequence list, interference signal coding sequence list, and the main lobe information list of the cross-correlation function between the interference signal coding sequence and the radar coding sequence based on the sampling results, determine the interference signal carrier frequency and the interference signal phase coding sequence, and generate a modulated interference signal based on the interference signal carrier frequency and the interference signal phase coding sequence.

8. An electronic device, characterized in that, The device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method according to any one of claims 1-6.

9. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to execute the method according to any one of claims 1-6.

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