Time-frequency phase composite modulation communication interference integrated waveform processing method based on intermittent sampling

Abstract

The invention discloses a time-frequency phase composite modulation communication interference integrated waveform processing method based on intermittent sampling, a generated communication interference integrated signal can generate interference on an enemy, so that deception interference is realized, and the interference effect on a pulse Doppler radar is improved; on the other hand, the communication-interference integrated signal can be transmitted to the receiving end to realize communication between the transmitting end and the receiving end, so that the communication function is expanded on the basis of interference, the communication function and the interference function share resources in aspects of hardware, frequency spectrum, power and the like, the communication distance and the anti-interference tolerance can be improved, the efficiency is improved, and the cost is reduced; based on an intermittent sampling and forwarding interference technology, interference signal parameters are adjusted in three dimensions of time, frequency and phase, communication information is embedded, communication interference integration is realized, the interference effect is improved, and covert communication is carried out by using interference shielding. The method is widely applied to the technical field of communication interference integration.

Description

Technical Field

[0001] This invention relates to the field of integrated communication jamming technology, and in particular to an integrated waveform processing method for communication jamming based on intermittent sampling and time-frequency phase composite modulation. Background Technology

[0002] Integrated communication and jamming refers to the technology of integrating communication transmission and electronic jamming functions into the same set of equipment, enabling the system to communicate with friendly forces while actively suppressing enemy radar signals, and conducting covert communication under the cover of jamming.

[0003] One way to achieve integrated communication jamming is to extend communication functions on top of radar jamming. This approach can be further subdivided into suppression jamming and deception jamming. For suppression jamming, modern Doppler radars improve signal processing gain through pulse compression and coherent accumulation, fundamentally undermining the energy advantage of suppression jamming by utilizing energy focusing effects. Therefore, suppression jamming is less effective and is generally not used. Deception jamming utilizes the coherent accumulation capability of the radar, resulting in better jamming effects. Designing integrated communication jamming waveforms based on this is more advantageous. However, the distribution of false targets in current deception jamming algorithms is regular, making them easy for the enemy to detect and eliminate. Summary of the Invention

[0004] To address the technical problems faced by current integrated communication jamming methods that rely on deceptive interference, such as the ease with which false targets can be detected and eliminated by the enemy, thus affecting the communication process, the present invention aims to provide a waveform processing method for integrated communication jamming based on intermittent sampling and time-frequency phase composite modulation.

[0005] This invention includes an integrated waveform processing method for time-frequency phase composite modulation communication interference based on intermittent sampling, comprising the following steps: Intercept enemy radar signals and obtain the interception signal; Determine the interference mode; the interference mode determines the number of sampled signals and the number of times the sampled signals are forwarded; According to the interference pattern, the intercepted signal is sampled using a sampling pulse to obtain at least one sampled signal; Acquire at least one set of data to be transmitted during the integrated communication jamming process; the data to be transmitted includes multiple data bits; According to the interference mode, the sampling signal is time-frequency phase composite modulation is performed on each group of data to be transmitted to obtain multiple forwarding segments; The aforementioned forwarding segments are used to form the integrated communication interference signal.

[0006] Further, the step of performing time-frequency phase composite modulation on the sampled signal with each group of data to be transmitted according to the interference mode to obtain multiple forwarding segments includes: When the interference mode is slice forwarding interference mode, for any set of data to be transmitted: The number of parts is determined based on the number of forwardings, and the data to be transmitted is divided into multiple parts based on the number of parts. For any portion of the data to be transmitted, the sampling signal is frequency-modulated using that portion to obtain a corresponding forwarding segment.

[0007] Further, the step of performing time-frequency phase composite modulation on the sampled signal with each group of data to be transmitted according to the interference mode to obtain multiple forwarding segments includes: When the interference mode is the intermittent sampling direct forwarding interference mode, for any set of data to be transmitted: The number of parts is determined based on the number of sampled signals, and the data to be transmitted is divided into multiple parts based on the number of parts. Establish a one-to-one correspondence between each of the sampled signals and each of the portions of the data to be transmitted in chronological order; For any portion of the data to be transmitted, the corresponding sampling signal is frequency-modulated using that portion to obtain a corresponding forwarding segment.

[0008] Furthermore, the step of performing time-frequency phase composite modulation on the sampled signal with each group of data to be transmitted according to the interference mode to obtain multiple forwarding segments further includes: For the last forwarded segment, phase modulation is performed using a portion of the corresponding data to be transmitted.

[0009] Further, the step of performing time-frequency phase composite modulation on the sampled signal with each group of data to be transmitted according to the interference mode to obtain multiple forwarding segments includes: When the interference mode is the intermittent sampling and repeated forwarding interference mode, for any set of data to be transmitted: The number of parts is determined based on the number of sampled signals, and the data to be transmitted is divided into multiple parts based on the number of parts. The number of sub-parts is determined based on the number of forwardings, and each part of the data to be transmitted is divided into multiple sub-parts based on the number of sub-parts. Establish a one-to-one correspondence between each of the sampled signals and each of the portions of the data to be transmitted in chronological order; For any part of the data to be transmitted, frequency modulation is performed on a corresponding sampling signal for each sub-part of the part to obtain multiple sub-segments, and the sub-segments are combined to form a corresponding forwarding segment.

[0010] Furthermore, the step of performing time-frequency phase composite modulation on the sampled signal with each group of data to be transmitted according to the interference mode to obtain multiple forwarding segments further includes: For the last sub-segment, phase modulation is performed using a sub-part of the corresponding data to be transmitted.

[0011] Furthermore, the at least one set of data to be transmitted in the integrated communication interference acquisition process includes: Acquire the data stream to be transmitted during the integrated communication jamming process; Set the number of bits per segment; The data stream to be transmitted is converted from serial to parallel based on the number of segments to obtain multiple sets of data to be transmitted.

[0012] Furthermore, the acquisition of at least one set of data to be transmitted in the integrated communication interference process further includes: Fill the least significant bit of the data to be transmitted in each group with either check data or random data.

[0013] Furthermore, the integrated waveform processing method for communication interference based on intermittent sampling and time-frequency phase composite modulation also includes: The transmitting end sends a reference pulse and the integrated communication interference signal.

[0014] Furthermore, the integrated waveform processing method for communication interference based on intermittent sampling and time-frequency phase composite modulation also includes: The receiving end receives the reference pulse and the integrated communication interference signal; The integrated communication interference signal is demodulated based on the reference pulse to obtain communication data.

[0015] The beneficial effects of this invention are as follows: The time-frequency phase composite modulation communication jamming integrated waveform processing method based on intermittent sampling in the embodiments generates an integrated communication jamming signal that can interfere with the enemy, thereby achieving deceptive jamming and improving the jamming effect on pulse Doppler radar. On the other hand, the integrated communication jamming signal can be transmitted to the receiving end to realize communication between the transmitting end and the receiving end, thereby expanding the communication function on the basis of jamming. Since the integrated communication jamming signal used for jamming has high power to suppress the enemy receiver, the integrated communication jamming signal shares the power resources of the jamming signal as a communication signal, which can improve the communication distance and anti-jamming tolerance. The communication function and the jamming function share resources in terms of hardware, spectrum and power, thereby improving efficiency and reducing costs. Based on intermittent sampling forwarding jamming technology, the jamming signal parameters are adjusted in the three dimensions of time, frequency and phase to embed communication information, thereby realizing integrated communication jamming. While improving the jamming effect, the jamming is used as a cover for covert communication. Attached Figure Description

[0016] Figure 1 A schematic diagram illustrating the basic principle of intermittent sampling forwarding interference; Figure 2 This is a schematic diagram illustrating the principle of the slice forwarding interference mode in the embodiment; Figure 3 This is a schematic diagram illustrating the principle of the intermittent sampling direct forwarding interference mode in the embodiment. Figure 4 This is a schematic diagram illustrating the principle of the intermittent sampling and repeated forwarding interference mode in the embodiment. Figure 5 This is a schematic diagram of the integrated communication interference process in the embodiment, which can be applied to the time-frequency phase composite modulation integrated waveform processing method based on intermittent sampling. Figure 6 This is a schematic diagram of the steps in the integrated waveform processing method for time-frequency phase composite modulation communication interference based on intermittent sampling in the embodiment; Figure 7 This is a schematic diagram illustrating the serial-to-parallel conversion of the data stream to be transmitted to obtain multiple sets of data to be transmitted in an embodiment. Figure 8 This is a schematic diagram illustrating the principle of slice forwarding modulation in an embodiment. Figure 9 This is a schematic diagram illustrating the principle of intermittent sampling and direct forwarding modulation in the embodiment. Figure 10 This is a schematic diagram illustrating the principle of intermittent sampling and repeated forwarding modulation in the embodiment; Figure 11 This is a schematic diagram of the interference effect under different pulse sampling durations in slice forwarding modulation obtained from communication performance simulation in the embodiment. Figure 12This is a schematic diagram illustrating the interference effect of different pulse sampling durations in intermittent sampling direct forwarding modulation obtained from communication performance simulation in the embodiment. Figure 13 This is a schematic diagram illustrating the interference effect of different pulse sampling durations in intermittent sampling repeated forwarding modulation obtained from communication performance simulation in the embodiment. Figure 14 This is a schematic diagram of the intermittent sampling forwarding interference effect and the integrated signal interference effect obtained from the communication performance simulation in the embodiment. Detailed Implementation

[0017] Terminology Explanation: Time-Phase-Frequency Modulation (TPM) refers to the joint modulation of the time, phase, and frequency of a waveform, where the modulation information is simultaneously determined by these three factors. This modulation technique fully utilizes the moduliable information dimension of the signal, allowing for flexible changes to the waveform parameters and enabling a single waveform to simultaneously carry multiple functions.

[0018] Intermittent Sampling Repeater Jamming is a deception jamming technique targeting linear frequency modulated (LFM) radars. The jammer steals LFM pulse segments transmitted by the radar in extremely short period (μs-level) slices and forwards them with delays, delaying each signal segment by a specific time. The enemy radar receiver misinterprets each forwarded segment as a real target echo, generating a group of equally spaced false targets on the range axis.

[0019] Waveform design refers to customizing the mathematical characteristics (such as frequency, phase, duration, bandwidth, etc.) of a signal for a specific task, so that it can achieve the required function in a specific scenario.

[0020] Intermittent sampling forwarding interference principle Intermittent sampling and forwarding jamming is a type of decoy jamming technique. Its basic principle is as follows: Figure 1 As shown. (Refer to...) Figure 1 When the enemy sends out radar signals (usually LFM signals) to detect real targets, the friendly transmitter intercepts the radar signals. The intercepted signal is called the intercept signal. After obtaining the intercept signal, the transmitter intermittently samples and forwards the intercept signal. This causes the enemy radar to receive the forwarded interference signal when it receives the real target echo formed by the radar signal. During signal processing, the interference signal is identified by the enemy as multiple false targets appearing near the real target echo, thus achieving interference against the enemy radar.

[0021] Intermittent sampling forwarding jamming has three basic jamming modes, namely the forwarding method of the jamming signal: slice forwarding jamming mode, intermittent sampling direct forwarding jamming mode, and intermittent sampling repeated forwarding jamming mode. Intermittent sampling direct forwarding jamming and intermittent sampling repeated forwarding jamming are generally more commonly used. The advantage of these two jamming modes is that they can generate false targets in the time-division multiplexing jamming system and can effectively resist anti-jamming waveforms such as pulse agility.

[0022] The three basic interference modes can be analyzed uniformly in the following manner: Let the intercepted enemy radar signal (intercepted signal) be The pulse width is The pulse repetition period is The sampling pulse signal used to sample the intercepted signal has signal parameters including the sampling pulse width. and sampling period Then the sampling pulse can be represented as:

[0023] in , It is a rounding function. The meaning is the number of times a captured signal (or a pulse in a captured signal) is sampled, that is, the number of sampled signals corresponding to a captured signal (or a pulse in a captured signal). For a rectangular window, satisfying:

[0024] By sampling the intercepted signal using sampling pulses, the obtained sampled signal can be expressed as:

[0025] Since the overall delay time of a Digital Radio Frequency Memory (DRFM) system from receiving a signal to completing storage, modification, reconstruction, and transmission is on the order of microseconds, ignoring the sampling-to-transmission delay, the forwarding period is set to be equal to the sampling pulse width, and forwarding occurs immediately after sampling. The interference signal generated by forwarding the sampled signal can then be expressed as:

[0026] in The number of times each sampled signal is forwarded.

[0027] when At that time, it belongs to the slice forwarding interference mode, and the resulting interference signal The generation principle of the slice forwarding interference signal is as follows: Figure 2As shown: First, a single signal segment is extracted according to the preset sampling period and pulse sampling duration. Then, the sampled segment is repeatedly forwarded according to the preset number of forwardings to form false target interference. From the signal level, slice forwarding interference is essentially a special implementation of intermittent sampling forwarding interference. Since the generation principle of the interference signal is the same, it can be regarded as intermittent sampling forwarding interference with an intermittent sampling period equal to the pulse width of the enemy's LFM signal. While maintaining high fidelity, this interference method can flexibly adjust the distribution and energy intensity of false targets due to the programmable control of the number of forwardings, thereby improving the deception effect on enemy radar detection. when hour, In this case, the signal is forwarded only once after sampling, which is an intermittent sampling and direct forwarding interference mode. The generation principle of the interference signal is as follows: Figure 3 As shown; when directly forwarding, the system needs to pre-set the sampling rate and sampling duration. When the system receives the enemy radar signal, it samples it intermittently, stores a certain length of the sampled signal within the sampling duration, and then immediately transmits it after a transmit / receive switch, realizing the storage of enemy radar signals and the transmission of jamming signals multiple times within one signal pulse width.

[0028] when hour, The signal is sampled and then forwarded multiple times, belonging to the intermittent sampling and repeated forwarding interference mode. The generation principle of its interference signal is as follows: Figure 4 As shown. In addition to setting the sampling rate and sampling duration, the number of repeated forwardings also needs to be set in advance. After receiving the enemy radar signal, it is sampled and stored. Unlike direct forwarding, repeated forwarding will repeat the forwarding according to the set number of forwardings after the transmit and receive switch. This is mainly to overcome the disadvantages of direct forwarding, such as easy exposure and poor tactical effectiveness.

[0029] Integrated Waveform Processing Method for Communication Interference Based on Intermittent Sampling and Time-Frequency Phase Composite Modulation Figure 2 , Figure 3 and Figure 4 The intermittent sampling and forwarding jamming technique shown works by periodically sampling and forwarding the intercepted signal (usually an LFM signal). It utilizes the sidelobe characteristics generated during radar pulse compression processing to create a dense false target signal, achieving both deception and suppression jamming. Further improvements can be made, such as phase-modulating the forwarded LFM signal to disrupt the amplitude and position distribution of the false targets, and frequency-modulating the forwarded signal to address the hysteresis problem of zero-order false targets.

[0030] In this embodiment, the improved algorithm described above can be combined to perform time-frequency phase composite modulation on the sampled signal obtained by intermittent sampling and then forward it. By using phase modulation, a denser number of false targets can be formed, which can improve the interference effect on the enemy's LFM signal. Moreover, by using frequency modulation, communication information can be concealed and communication functions can be expanded.

[0031] This embodiment provides an integrated waveform processing method for time-frequency phase composite modulation communication interference based on intermittent sampling. This method can be applied to... Figure 5 The system shown. (Refer to...) Figure 5 In this system, both the transmitter and receiver are friendly. The enemy sends radar signals to detect real targets such as aircraft and drones. The transmitter aims to intercept the radar signals, obtain the intercepted signals, and forward them to the enemy, thus confusing the signals reflected back from real targets with the signals forwarded by the transmitter. Simultaneously, the transmitter wants to send information to the receiver, which is also friendly, to communicate with it. The transmitter can choose to execute a time-frequency phase composite modulation communication jamming integrated waveform processing method based on intermittent sampling (specifically steps S1-S6), embedding the information to be sent to the receiver into the intercepted signals to form a communication jamming integrated signal. This integrated communication jamming signal is received by the enemy, thus interfering with their detection, and is also received by the friendly receiver, enabling communication with it.

[0032] In this embodiment, refer to Figure 6 The integrated waveform processing method for communication interference based on intermittent sampling and time-frequency phase composite modulation includes the following steps: S1. Intercept the enemy's radar signal and obtain the intercept signal; S2. Determine the interference mode; S3. Based on the interference pattern, use sampling pulses to sample the intercepted signal to obtain at least one sampled signal; S4. Acquire at least one set of data to be transmitted during the integrated communication jamming process; S5. Based on the interference mode, the sampled signal is subjected to time-frequency phase composite modulation with each group of data to be transmitted to obtain multiple forwarding segments; S6. The various forwarding segments are combined to form an integrated communication jamming signal.

[0033] In step S1, the sending end is as follows: Figure 5 As shown, the radar signals emitted by the enemy are detected, and the radar signals detected by the transmitting end are intercept signals.

[0034] In this embodiment, the radar signal emitted by the enemy and the integrated communication jamming signal ultimately generated and emitted by the transmitting end can be signals in the form of electromagnetic waves or sound waves.

[0035] In step S2, the transmitting end can determine which interference mode to use based on task requirements. In this embodiment, the interference mode that the transmitting end can use is one of three: slice forwarding interference mode, intermittent sampling direct forwarding interference mode, and intermittent sampling repeated forwarding interference mode. Each interference mode has a specific number of sampled signals (corresponding to one intercepted signal) and the number of times the sampled signal is forwarded (corresponding to one sampled signal). For example, Figure 2 In the slice-forwarding interference mode shown, for each intercepted signal, one sampling pulse is used for sampling, and the sampled signal is forwarded three times. Therefore, the number of sampled signals corresponding to this slice-forwarding interference mode is... =1, corresponding to the number of forwards of the sampled signal is =3; Figure 3 In the intermittent sampling direct forwarding interference mode shown, for a single intercepted signal, four sampling pulses are used for sampling. Each sampled signal is forwarded once. Therefore, the number of sampled signals corresponding to this slice forwarding interference mode is... =4, corresponding to the number of times the sampled signal is forwarded. =1; Figure 4 In the intermittent sampling and repetitive forwarding interference mode shown, for one intercepted signal, two sampling pulses are used for sampling, and each sampled signal is forwarded three times. Therefore, the number of sampled signals corresponding to this slice forwarding interference mode is... =2, corresponding to the number of forwardings of the sampled signal is =3.

[0036] In this embodiment, when the transmitting end performs step S4, which is to obtain at least one set of data to be transmitted in the integrated communication interference process, it can specifically perform the following steps: S401. Acquire the data stream to be transmitted during the integrated communication jamming process; S402. Set the number of segments; S403. Perform serial-to-parallel conversion on the data stream to be transmitted according to the number of segments to obtain multiple sets of data to be transmitted.

[0037] The principle of steps S401-S403 is as follows: Figure 7 As shown. (Refer to...) Figure 7 In step S401, the sending end obtains the data stream to be transmitted in the integrated communication interference process. The data stream to be transmitted is the information that the sending end wants to send to the receiving end. Specifically, it can be multiple binary data with contents such as 100101010...1011101.

[0038] In step S402, the sending end sets a segmentation bit depth M, which represents the number of bits of binary data contained in each group of data to be transmitted, dividing the data stream to be transmitted into multiple groups. For example, Figure 7 M=12.

[0039] In step S403, the sending end performs serial-to-parallel conversion on the data stream to be transmitted based on the number of segments M. Specifically, the sending end can read the data stream to be transmitted in the order of the individual binary data bits themselves, and divide each M binary data bits read into a group of data to be transmitted. Generally, the number of binary data bits contained in the data stream to be transmitted is much greater than M, so multiple groups of data to be transmitted can be obtained.

[0040] By executing steps S401-S403, the data stream to be transmitted can be divided into multiple groups of data to be transmitted, each group consisting of M bits of data. This allows for the processing of each group of data separately, yielding the corresponding integrated communication interference signal for each M-bit group. For these multiple groups of M-bit data to be transmitted, step S5 can be executed for modulation processing.

[0041] In this embodiment, when the transmitting end performs step S5, which is to perform time-frequency phase composite modulation on the sampled signal with each group of data to be transmitted according to the interference mode to obtain multiple forwarding segments, the following steps can be specifically performed: When the interference mode is slice forwarding interference mode, for any set of data to be transmitted: S501A. Determine the number of parts based on the number of forwardings, and divide the data to be transmitted into multiple parts based on the number of parts; S502A. For any part of the data to be transmitted, the sampling signal is frequency-modulated to obtain a corresponding forwarding segment.

[0042] Steps S501A-S502A are the first execution method of step S5, specifically, the interference mode selected in step S2 is the slice forwarding interference mode (e.g. Figure 2 In the case of the mode shown, the intercepted signal is modulated using the data to be transmitted, i.e., slice forwarding modulation.

[0043] The principle of steps S501A-S502A is as follows: Figure 8 As shown. Steps S501A-S502A are performed for each group of data to be transmitted. In this embodiment, steps S501A-S502A are explained using a group of data with the content "111010110100" as an example.

[0044] Reference Figure 8In slice forwarding interference mode, the number of sampled signals is always 1, that is... =1, the obtained sampled signal is Figure 8 The sampling signal 1 in the sample; the number of forwards of the sampled signal is 1. This means it needs to be forwarded. This forms an integrated signal for communication interference. Figure 8 middle =3, therefore in step S501A, based on the number of forwards... =3 determines the number of parts to be 3. The data to be transmitted is divided into multiple parts, the number of which equals the number of parts. For example... Figure 8 In the process, the data to be transmitted with the content "111010110100" (i.e., the first line of data to be transmitted) is divided into three parts with the content "1110", "1011" and "0100" respectively.

[0045] In step S502A, the sampling signal is frequency-modulated for each part of the data to be transmitted to obtain a corresponding forwarding segment. Specifically, refer to... Figure 8 The first part, "1110", is used to modulate the sampled signal 1 using the mapped phase modulation parameters and as a frequency modulation symbol to obtain the first forwarding segment. The second part, "1011", is used to modulate the sampled signal 1 using the mapped phase modulation parameters and as a frequency modulation symbol to obtain the second forwarding segment. The third part, "0100", is used to modulate the sampled signal 1 using the mapped phase modulation parameters and as a frequency modulation symbol to obtain the third forwarding segment. Finally, the quantity and number of forwardings are obtained. The same forwarded fragment.

[0046] Step S5 is executed by performing steps S501A-S502A, and step S6 is executed by the transmitting end. These three forwarding segments are sent out as an integrated communication jamming signal. This achieves the multiple forwarding sampling signal required by the slice forwarding jamming mode, thereby achieving the jamming effect on the enemy. At the same time, the transmitted integrated communication jamming signal can carry information. When the receiving end receives the integrated communication jamming signal, it can recover the information with the content "111010110100" from it, thereby realizing communication between the transmitting end and the receiving end.

[0047] In this embodiment, when the transmitting end performs step S5, which is to perform time-frequency phase composite modulation on the sampled signal with each group of data to be transmitted according to the interference mode to obtain multiple forwarding segments, the following steps can be specifically performed: When the interference mode is intermittent sampling and direct forwarding interference mode, for any set of data to be transmitted: S501B. Determine the number of parts based on the number of sampled signals, and divide the data to be transmitted into multiple parts based on the number of parts; S502B. Establish a one-to-one correspondence between each sampled signal and each part of the data to be transmitted in chronological order; S503B. For any part of the data to be transmitted, the corresponding sampled signal is frequency-modulated to obtain a corresponding forwarding segment.

[0048] Steps S501B-S503B are the second execution method of step S5, specifically, the interference mode selected in step S2 is the intermittent sampling direct forwarding interference mode (e.g. Figure 3 In the case of the mode shown, the intercepted signal is modulated using the data to be transmitted, i.e., intermittent sampling and direct forwarding modulation.

[0049] The principle of steps S501B-S503B is as follows: Figure 9 As shown. Steps S501B-S503B are executed for each group of data to be transmitted. In this embodiment, steps S501B-S503B are explained using a group of data with the content "111010110100" as an example.

[0050] Reference Figure 9 In the intermittent sampling direct forwarding interference mode, the number of sampled signals is multiple, specifically... Figure 9 The middle value is 4, that is =4, the obtained sampled signal is Figure 9 The sampled signals are 1, 2, 3, and 4, etc.; the number of forwardings of the sampled signals is... That is, each sampled signal needs to be forwarded separately. This forms an integrated signal for communication interference. Figure 9 middle =1, therefore in step S501A, based on the number of sampled signals The number of parts is set to 4. The data to be transmitted is divided into multiple parts, the number of which is equal to the number of parts. For example... Figure 9 In the process, the data to be transmitted with the content "111010110100" (i.e., the first line of data to be transmitted) is divided into four parts with the content "111", "010", "110" and "100" respectively.

[0051] In step S502B, a one-to-one correspondence is established between each sampled signal and each part of the data to be transmitted in chronological order, for example... Figure 9 In the above, sampling signal 1 corresponds to the part of the data to be transmitted that contains "111", sampling signal 2 corresponds to the part of the data to be transmitted that contains "010", sampling signal 3 corresponds to the part of the data to be transmitted that contains "110", and sampling signal 4 corresponds to the part of the data to be transmitted that contains "100".

[0052] In step S503B, each part of the data to be transmitted is frequency-modulated using a corresponding sampling signal to obtain a corresponding forwarding segment. Specifically, refer to... Figure 9 The first part, "111", is used to modulate sample signal 1 using the mapped phase modulation parameters and as a frequency modulation symbol to obtain the first forwarding segment; the second part, "010", is used to modulate sample signal 2 using the mapped phase modulation parameters and as a frequency modulation symbol to obtain the second forwarding segment; the third part, "110", is used to modulate sample signal 3 using the mapped phase modulation parameters and as a frequency modulation symbol to obtain the third forwarding segment; the fourth part, "100", is used to modulate sample signal 4 using the mapped phase modulation parameters and as a frequency modulation symbol to obtain the fourth forwarding segment; finally, the number of samples is obtained. The same forwarded fragment.

[0053] Step S5 is executed by executing steps S501B-S503B, and step S6 is executed by the transmitting end. These four forwarding segments are sent out as an integrated communication jamming signal. This achieves the multiple forwarding sampling signal required by the slice forwarding jamming mode, thereby achieving the jamming effect on the enemy. At the same time, the transmitted integrated communication jamming signal can carry information. When the receiving end receives the integrated communication jamming signal, it can recover the information with the content "111010110100" from it, thereby realizing communication between the transmitting end and the receiving end.

[0054] In this embodiment, when the transmitting end performs step S5, which is to perform time-frequency phase composite modulation on the sampled signal with each group of data to be transmitted according to the interference mode to obtain multiple forwarding segments, the following steps can be specifically performed: When the interference mode is intermittent sampling and repeated forwarding interference mode, for any set of data to be transmitted: S501C. Determine the number of parts based on the number of sampled signals, and divide the data to be transmitted into multiple parts based on the number of parts; S502C. Determine the number of sub-parts based on the number of forwardings, and divide each part of the data to be transmitted into multiple sub-parts based on the number of sub-parts; S503C. Establish a one-to-one correspondence between each sampled signal and each part of the data to be transmitted in chronological order; S504C. For any part of the data to be transmitted, each sub-part of the part is frequency-modulated with a corresponding sampling signal to obtain multiple sub-segments, and the sub-segments are combined to form a corresponding forwarding segment.

[0055] Steps S501C-S504C are the third execution method of step S5, specifically, the interference mode selected in step S2 is the intermittent sampling and repeated forwarding interference mode (e.g. Figure 4In the case of the mode shown, the intercepted signal is modulated using the data to be transmitted, i.e., intermittent sampling and repeated forwarding modulation.

[0056] The principle of steps S501C-S504C is as follows: Figure 10 As shown. Steps S501C-S504C are executed for each group of data to be transmitted. In this embodiment, steps S501C-S504C are explained using a group of data with the content "111010110100" as an example.

[0057] Reference Figure 10 In the intermittent sampling and repeated forwarding interference mode, the number of sampled signals is multiple, specifically... Figure 10 The middle is 3, that is =3, the obtained sampled signal is Figure 10 The sampled signals are 1, 2, and 3, etc.; the number of forwardings of the sampled signals is... That is, each sampled signal needs to be forwarded separately. This forms an integrated signal for communication interference. Figure 10 middle =2, therefore in step S501C, based on the number of sampled signals The number of parts is set to 3. The data to be transmitted is divided into multiple parts, the number of which is equal to the number of parts. For example... Figure 10 In the process, the data to be transmitted with the content "111010110100" (i.e., the first line of data to be transmitted) is divided into three parts with the content "1110", "1011" and "0100" respectively.

[0058] In step S502C, based on the number of forwards... The number of sub-parts is set to 2. Each part of the data to be transmitted is divided into multiple sub-parts, the number of which is equal to the number of sub-parts. For example... Figure 10 In the data to be transmitted, the first part, "1110", containing the content "111010110100", is divided into two sub-parts: "11" and "10". The second part, "1011", is divided into two sub-parts: "10" and "11". The third part, "0100", is divided into two sub-parts: "01" and "00". By executing step S502C, six sub-parts are obtained: "11", "10", "10", "11", "01", and "00".

[0059] In step S503C, a one-to-one correspondence is established between each sampled signal and each part of the data to be transmitted in chronological order, for example... Figure 10In the above, sampling signal 1 corresponds to the part of the data to be transmitted containing "1110" (and therefore corresponds to the two sub-parts containing "11" and "10"); sampling signal 2 corresponds to the part of the data to be transmitted containing "1011" (and therefore corresponds to the two sub-parts containing "10" and "11"); and sampling signal 3 corresponds to the part of the data to be transmitted containing "0100" (and therefore corresponds to the two sub-parts containing "01" and "00").

[0060] In step S504C, for any part of the data to be transmitted, the frequency of a corresponding sampling signal is modulated for each sub-part of the part to obtain multiple sub-segments, which are then combined to form a corresponding forwarding segment. Specifically, refer to... Figure 10 The first sub-segment is obtained by modulating sampled signal 1 with the first sub-part "11" in the first part using the mapped phase modulation parameters and as frequency modulation symbols. The second sub-segment is obtained by modulating sampled signal 1 with the second sub-part "10" in the first part using the mapped phase modulation parameters and as frequency modulation symbols. The first and second sub-segments together form the first forwarding segment. The third sub-segment is obtained by modulating sampled signal 2 with the first sub-part "10" in the second part using the mapped phase modulation parameters and as frequency modulation symbols. The second sub-segment is obtained by modulating sampled signal 2 with the second sub-part "11" in the second part. The sub-part "11" modulates the sampled signal 2 using the mapped phase modulation parameters and as frequency modulation symbols to obtain the fourth sub-segment. The third and fourth sub-segments together form the second forwarding segment. The first sub-part "01" in the third part modulates the sampled signal 3 using the mapped phase modulation parameters and as frequency modulation symbols to obtain the fifth sub-segment. The second sub-part "00" in the third part modulates the sampled signal 3 using the mapped phase modulation parameters and as frequency modulation symbols to obtain the sixth sub-segment. The fifth and sixth sub-segments together form the third forwarding segment. Therefore, by executing step S504C, a total of [number missing] sub-segments can be obtained. Individual segments, forming A forwarded fragment.

[0061] Step S5 is executed by executing steps S501C-S504C, and step S6 is executed by the transmitting end. These three forwarding segments are sent out as an integrated communication jamming signal. This achieves the multiple forwarding sampling signal required by the slice forwarding jamming mode, thereby achieving the jamming effect on the enemy. At the same time, the transmitted integrated communication jamming signal can carry information. When the receiving end receives the integrated communication jamming signal, it can recover the information with the content "111010110100" from it, thereby realizing communication between the transmitting end and the receiving end.

[0062] In this embodiment, based on executing steps S501A-S502A, S501B-S503B, or S501C-S504C, further references can be made respectively. Figure 8 , Figure 9 and Figure 10 For the last part of the integrated communication interference signal obtained by each party, a part of the corresponding data to be transmitted is used for phase modulation.

[0063] Specifically, for Figure 8 The execution result of steps S501A-S502A shows that the last distinguishable part of the integrated communication interference signal is a forwarding segment modulated according to "0100". Therefore, this forwarding segment can be phase-modulated according to "0100" (other forwarding segments are not phase-modulated); for Figure 9 The execution results of steps S501B-S503B show that the last distinguishable part of the integrated communication interference signal is a forwarding segment modulated according to "100". Therefore, this forwarding segment can be phase-modulated according to "100" (other forwarding segments are not phase-modulated); for Figure 10 The execution results of S501C-S504C shown show that the last distinguishable part of the integrated communication interference signal is a sub-segment modulated according to "00". Therefore, this sub-segment can be phase-modulated according to "00" (other sub-segments are not phase-modulated).

[0064] In this embodiment, Figure 8 , Figure 9 and Figure 10 The principle behind phase modulation of the last part (e.g., the last forwarding segment or the last sub-segment) of the integrated communication jamming signal is as follows: By phase modulating at least a portion of the integrated communication jamming signal, the jamming effect of the integrated communication jamming signal on the enemy can be improved. Although a longer phase modulation duration improves the jamming effect, it also affects the demodulation of each forwarding segment in the integrated communication jamming signal as frequency-modulated data. That is, it affects the recovery of communication data from the integrated communication jamming signal by the receiver after receiving it. Therefore, the transmitter only performs phase modulation on the last forwarding portion. Correspondingly, after the receiver receives the integrated communication jamming signal and recovers the communication data from it through demodulation, the receiver discards the data carried by the last forwarding segment or the last sub-segment, thereby reducing the possibility of an increase in the bit error rate caused by phase modulation.

[0065] In this embodiment, according to Figure 8 , Figure 9 and Figure 10As illustrated by the principle of phase modulation on the last part of the integrated communication jamming signal, the phase-modulated last part mainly serves to interfere with the enemy and may be discarded by the receiver. Therefore, when the transmitter obtains the data to be transmitted by grouping the data stream, for any given group of data, the transmitter can extract multiple data bits from the data stream as part of this group of data (e.g., the highest few data bits), and fill this part with check data or random data as another part of the group of data to be transmitted (e.g., the lowest few data bits), thus forming the group of data to be transmitted. This helps the receiver reduce data loss when recovering the data.

[0066] In this embodiment, after the transmitting end obtains the integrated communication interference signal by executing steps S1-S6, it can send out the integrated communication interference signal and the reference pulse (generally an unmodulated LFM signal).

[0067] The receiver receives a reference pulse and a communication jamming signal. It demodulates the integrated communication jamming signal using frequency shift detection. During demodulation, an unmodulated, intermittently sampled and forwarded jamming signal (LFM signal) is used as the reference signal. During jamming, the first intercepted pulse repetition period signal is intermittently sampled and then linearly frequency-shifted and forwarded. Subsequent intercepted signals are all subjected to time-frequency phase composite modulation based on the linear frequency shift. The frequency shift is obtained by multiplying the reference signal and the integrated signal by their conjugate during demodulation, thus demodulating the communication data. Under normal circumstances, the communication data obtained by the receiver is the same as the data to be transmitted processed by the transmitter, thereby achieving information transmission between the transmitter and receiver.

[0068] In this embodiment, by executing steps S1-S6, the following effects can be obtained: Integrated communication jamming signals can interfere with the enemy, achieving deceptive jamming and improving the jamming effect against pulse-Doppler radar. For example, the false targets generated by integrated communication jamming signals are random, resulting in a denser network of false targets. On the other hand, integrated communication jamming signals can be transmitted to the receiving end, enabling communication between the transmitter and receiver, thus expanding communication functions on top of jamming. Because the integrated communication jamming signals used for jamming have high power to suppress the enemy receiver, they share the power resources of the jamming signals, increasing communication distance and anti-jamming tolerance. This allows communication and jamming functions to share resources in terms of hardware, spectrum, and power, achieving efficiency improvement and cost reduction. Based on intermittent sampling and forwarding jamming technology, the parameters of the jamming signal are adjusted in the three dimensions of time, frequency, and phase to embed communication information, achieving integrated communication jamming. This improves the jamming effect while using jamming as cover for covert communication.

[0069] Simulation of Interference Effect and Communication Performance of Integrated Communication Interference Signal Based on Intermittent Sampling Time-Frequency Phase Composite Modulation Regarding the interference effect, simulation analysis was conducted based on three different forwarding methods. The first is slice forwarding modulation (corresponding to...). Figure 8 (The modulation mode shown) determines the sampling period of the interference signal based on the set parameters. With a pulse duration of 10 μs and an interference-to-signal ratio of 10 dB, the interference effect under different pulse sampling durations is as follows: Figure 11 As shown, when the pulse sampling duration is constant, due to the influence of composite modulation, the distribution of false targets exhibits a certain degree of randomness. Taking μs as an example, with a forwarding count of 9, the distribution of false targets varies depending on the modulated data. As the pulse sampling duration decreases, the false targets gradually shift from being concentrated to being diffused, and the peak value also decreases as the pulse sampling duration decreases.

[0070] Secondly, there is intermittent sampling direct forwarding modulation (corresponding to) Figure 9 (The modulation mode shown) determines the sampling period of the interference signal based on the set parameters. for When the pulse sampling duration When the time is 1μs, each sample is forwarded once, and the total number of forwards is... For 5 times; when the pulse sampling duration is... At a time of 0.5μs, the total number of forwards For 10 times; when the pulse sampling duration is... When the time is 0.1μs, the total number of forwards The number of times is 50. Since direct forwarding involves sampling once and forwarding once, and the pulse sampling duration is half the sampling period, the forwarded signal duration only accounts for half the total signal duration, requiring a higher signal-to-noise ratio (SNR) to ensure effective interference. With an SNR of 13 dB, the interference effects at different pulse sampling durations are as follows: Figure 12As shown in the simulation results, the interference effect of intermittent sampling direct modulation forwarding also deteriorates as the pulse sampling duration decreases. At pulse sampling durations of 1 μs and 0.5 μs, the false targets exhibit randomness, resulting in good masking of the real target, which is essentially submerged within the false targets. However, when the pulse sampling duration is 0.1 μs, the main lobe of the false target widens. At this point, the main lobes and high side lobes of multiple false targets overlap, forming a false target peak with a relatively constant position. This false target is located nearby, with a time delay of approximately 0.1 μs from the real target, equivalent to a distance of 15m. At this point, the interference performance is poor. Comparing slice modulation forwarding and intermittent sampling direct modulation forwarding, it can be seen that slice forwarding, due to continuous forwarding, results in a denser concentration of false targets, completely submerging the real target. In contrast, intermittent sampling direct modulation forwarding, with its discontinuous forwarding signal, results in relatively dispersed false targets, increasing the risk of detection of the real target.

[0071] Finally, intermittent sampling and repeated forwarding modulation (corresponding to) Figure 10 (The modulation mode shown) determines the sampling period of the interference signal based on the set parameters. for When the pulse sampling duration When the duration is 1 μs, each pulse is sampled and forwarded three times, for a total of [number] forwards. For 7 times; when the pulse sampling duration is... At 0.5 μs, the total number of forwards For 15 times; when the pulse sampling duration is... At a time of 0.1 μs, the total number of forwards The frequency is 75 times. During repetition, one pulse sample is forwarded three times, and the pulse sampling duration is 1 / 4 of the sampling period; therefore, the forwarded signal duration accounts for 3 / 4 of the total signal duration. With an interference-to-signal ratio of 10 dB, the interference effect at different pulse sampling durations is as follows: Figure 13 As shown.

[0072] Taking intermittent sampling direct forwarding interference as an example, the interference effects of integrated signal and intermittent sampling forwarding interference are compared, such as... Figure 14 As shown, during intermittent sampling and direct forwarding, the distribution of false targets exhibits a certain regularity due to the forwarding delay, as the main false target forms after the real false target. Furthermore, the false targets formed by direct forwarding are relatively dispersed and cannot overwhelm the real target. In contrast, the string of false targets formed after integrated signal interference is randomly distributed around the real target and can completely overwhelm it. Comparing the interference effects of the two, the false targets formed by the integrated signal are more concentrated around the real target and their distribution is random, thus fully utilizing the energy and randomness of the interference signal to protect the real target.

[0073] A computer program can be written to execute the time-frequency phase composite modulation communication interference integrated waveform processing method based on intermittent sampling in this embodiment. The computer program can be written into a computer device or storage medium. When the computer program is read out and run, the time-frequency phase composite modulation communication interference integrated waveform processing method based on intermittent sampling in this embodiment can be executed, thereby achieving the same technical effect as the time-frequency phase composite modulation communication interference integrated waveform processing method based on intermittent sampling in the embodiment.

[0074] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this disclosure are only relative to the relative positional relationships of the components of this disclosure in the accompanying drawings. The singular forms "a," "an," and "the" used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. Moreover, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this embodiment specification is only for describing particular embodiments and is not intended to limit the invention. The term "and / or" as used in this embodiment includes any combination of one or more of the associated listed items.

[0075] It should be understood that although the terms first, second, third, etc., may be used to describe various elements in this disclosure, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, a first element may also be referred to as a second element without departing from the scope of this disclosure, and similarly, a second element may also be referred to as a first element. The use of any and all instances or exemplary language (“e.g.,” “such as,” etc.) provided in this embodiment is intended only to better illustrate embodiments of the invention and, unless otherwise required, does not impose a limitation on the scope of the invention.

[0076] It should be recognized that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable storage medium. The method can be implemented using standard programming techniques—including a non-transitory computer-readable storage medium configured with a computer program, wherein such a storage medium causes the computer to operate in a specific and predefined manner—according to the methods and drawings described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. Furthermore, for this purpose, the program can run on a programmed application-specific integrated circuit (ASIC).

[0077] Furthermore, the procedures described in this embodiment can be performed in any suitable order unless otherwise indicated by this embodiment or otherwise obviously contradict the context. The procedures (or variations and / or combinations thereof) described in this embodiment can be executed under the control of one or more computer systems configured with executable instructions, and can be implemented by hardware or a combination thereof as code (e.g., executable instructions, one or more computer programs, or one or more applications) that commonly executes on one or more processors. A computer program includes a plurality of instructions executable by one or more processors.

[0078] Furthermore, the method can be implemented in any suitable type of computing platform, including but not limited to personal computers, minicomputers, mainframes, workstations, networked or distributed computing environments, standalone or integrated computer platforms, or in communication with charged particle tools or other imaging devices, etc. Aspects of the invention can be implemented as machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and / or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the processes described herein. Furthermore, the machine-readable code, or portions thereof, can be transmitted via wired or wireless networks. The invention of this embodiment includes these and other different types of non-transitory computer-readable storage media when such media comprises instructions or programs that implement the steps above in conjunction with a microprocessor or other data processor. When programmed according to the methods and techniques of the invention, the invention also includes the computer itself.

[0079] A computer program can be applied to input data to perform the functions of this embodiment, thereby transforming the input data to generate output data stored in non-volatile memory. The output information can also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects generated on the display.

[0080] The above are merely preferred embodiments of the present invention. The present invention is not limited to the above-described embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention, as long as they achieve the technical effects of the present invention by the same means, should be included within the scope of protection of the present invention. Within the scope of protection of the present invention, the technical solutions and / or implementation methods can have various modifications and variations.

Claims

1. A method for processing an integrated waveform of communication and jamming based on intermittent sampling of time-frequency phase complex modulation, characterized in that, The method comprises the following steps: Intercepting the radar signal of the enemy to obtain an intercepted signal; Determining an interference mode, which determines the number of sampling signals and the number of retransmissions of the sampling signals; According to the interference mode, sampling the intercepted signal using sampling pulses to obtain at least one sampling signal; Obtaining at least one group of to-be-transmitted data in a communication-interference integrated process; the to-be-transmitted data comprises a plurality of data bits; According to the interference mode, performing time-frequency-phase composite modulation on the sampling signal using each group of to-be-transmitted data to obtain a plurality of retransmission segments; Each retransmission segment constitutes the communication-interference integrated signal.

2. The method of claim 1, wherein the method is a method of processing an integrated waveform of communication and jamming based on intermittent sampling of time-frequency phase complex modulation. According to the interference mode, performing time-frequency-phase composite modulation on the sampling signal using each group of to-be-transmitted data to obtain a plurality of retransmission segments comprises: When the interference mode is a slice retransmission interference mode, for any group of to-be-transmitted data: According to the number of retransmissions, determining a number of parts, and dividing the to-be-transmitted data into a plurality of parts according to the number of parts; For any part of the to-be-transmitted data, performing frequency modulation on the sampling signal using the part to obtain a corresponding retransmission segment.

3. The method of claim 1, wherein the method further comprises: According to the interference mode, performing time-frequency-phase composite modulation on the sampling signal using each group of to-be-transmitted data to obtain a plurality of retransmission segments comprises: When the interference mode is an intermittent sampling direct retransmission interference mode, for any group of to-be-transmitted data: According to the number of sampling signals, determining a number of parts, and dividing the to-be-transmitted data into a plurality of parts according to the number of parts; Establishing a one-to-one correspondence between each sampling signal and each part of the to-be-transmitted data in chronological order; For any part of the to-be-transmitted data, performing frequency modulation on a corresponding sampling signal using the part to obtain a corresponding retransmission segment.

4. The method of claim 2 or 3, wherein, According to the interference mode, performing time-frequency-phase composite modulation on the sampling signal using each group of to-be-transmitted data to obtain a plurality of retransmission segments further comprises: For the last retransmission segment, performing phase modulation using a corresponding part of the to-be-transmitted data.

5. The method of claim 1, wherein, According to the interference mode, performing time-frequency-phase composite modulation on the sampling signal using each group of to-be-transmitted data to obtain a plurality of retransmission segments comprises: When the interference mode is an intermittent sampling repeated retransmission interference mode, for any group of to-be-transmitted data: According to the number of sampling signals, determining a number of parts, and dividing the to-be-transmitted data into a plurality of parts according to the number of parts; According to the number of retransmissions, determining a number of subparts, and dividing each part of the to-be-transmitted data into a plurality of subparts according to the number of subparts; Establishing a one-to-one correspondence between each sampling signal and each part of the to-be-transmitted data in chronological order; For any part of the to-be-transmitted data, performing frequency modulation on a corresponding sampling signal using each subpart in the part to obtain a plurality of subsegments, and using the subsegments to constitute a corresponding retransmission segment.

6. The method of claim 5, wherein the method further comprises: The time-frequency phase composite modulation of the sampling signal by each group of the to-be-transmitted data according to the interference pattern to obtain a plurality of forwarding segments further includes: For the last sub-segment, phase modulation is performed using a corresponding sub-part of the to-be-transmitted data.

7. The method of claim 1, wherein, The method further includes: Obtaining a to-be-transmitted data stream of the communication interference integrated process; Setting a segmentation bit number; Serial-parallel conversion is performed on the to-be-transmitted data stream according to the segmentation bit number to obtain a plurality of groups of to-be-transmitted data.

8. The method of claim 7, wherein the method further comprises: The method further includes: Respectively filling the lowest bits of each group of the to-be-transmitted data with check data or random data.

9. The method of claim 1-8, wherein the method is characterized by, The method further includes: The sending end sends a reference pulse and the communication interference integrated signal.

10. The method of claim 9, wherein, The method further includes: The receiving end receives the reference pulse and the communication interference integrated signal; According to the reference pulse, the communication interference integrated signal is demodulated to obtain communication data.

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