Waveform design method for resisting intermittent sampling direct forwarding interference with intra-pulse segment protection

Abstract

The present invention provides a method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmented shielding, which relates to the field of radar waveform design and signal processing, and includes the following steps: obtaining interference information of an interference signal, performing pulse compression on an echo signal to obtain a range image result; performing constant false alarm detection to obtain the position information of a peak point; extracting an integral sequence corresponding to a peak point; identifying and obtaining a false target secondary peak point and a false target main peak point; obtaining interference parameters, cross-arranging a high-frequency shielding signal and a low-frequency protected signal; filtering the echo signal to obtain information about a real target. The present invention aims to solve the problem that false targets formed by intermittent sampling direct forwarding interference make it difficult to identify true and false targets at the receiving end, and achieves the purpose of anti-interference through waveform design at the transmitting end and filtering processing at the receiving end, and accurately identifies the real target. A shielding waveform is designed according to the characteristics of the interference signal, which is conducive to making the subsequent sampled and forwarded signals in the shielding band.

Description

Technical Field

[0001] The invention relates to the field of radar waveform design and signal processing technology, and in particular to a waveform design method for resisting intermittent sampling direct forwarding interference with intra-pulse segmentation protection. Background Art

[0002] As the interference signals generated by existing digital radio frequency become more diverse, the electromagnetic environment faced by radar is becoming more and more complex. Since the interference signal is coherent with the radar transmission signal, false target deception interference will be generated in the distance dimension after pulse compression, which will bring severe challenges to the effective detection of radar.

[0003] Traditional methods to combat intermittent sampling and forwarding interference are mainly carried out from two aspects: interference identification and suppression and waveform design. In terms of interference identification and suppression, current research is mainly focused on linear frequency modulation (LFM) radar systems, but this method is not applicable to radar systems with complex transmission signals; in terms of waveform design, currently, encoding is usually performed within the pulse to improve the orthogonality of the waveform, and a large number of complex algorithms are used to achieve the purpose of anti-interference, which requires a large amount of calculation.

[0004] At present, the intermittent sampling direct forwarding interference parameter estimation mainly achieves accurate estimation of LFM signals by analyzing the time-frequency characteristics of the interference signal. However, for complex signals, such as LFM-Costas frequency stepping signals, the time-frequency diagrams of the transmission signal and the interference signal are both irregularly distributed fragments, making it difficult to distinguish the two in time and frequency. Traditional methods often cannot analyze the interference signal due to the difficulty in estimating the pulse width of the signal, and thus cannot achieve effective radar detection. Summary of the invention

[0005] The present invention provides a waveform design method for resisting intermittent sampling direct forwarding interference with intra-pulse segmentation protection, which is used to solve the defects of the above-mentioned prior art and realize effective suppression of intermittent sampling direct forwarding interference under low signal-to-interference ratio.

[0006] The present invention provides a method for designing an anti-intermittent sampling direct forwarding interference waveform with intra-pulse segmentation protection, comprising the steps of:

[0007] S1 transmits a detection signal to obtain interference information of an intermittently sampled directly forwarded interference signal, and performs pulse compression on an echo signal of the detection signal to obtain a range image result;

[0008] S2 performs constant false alarm detection on the range image result to obtain the position information of each peak point in the range image result;

[0009] S3 extracts the integral sequence corresponding to each peak point based on the position information;

[0010] S4 identifies the real target peak point and the false target peak point based on the integral sequence corresponding to each peak point; performs main and secondary peak judgment on the identified false target peak point to obtain the false target secondary peak point and the false target main peak point;

[0011] S5 processes the integral sequence corresponding to the main peak point of the false target, obtains the interference sampling duration and interference sampling period of the interference signal, and obtains the duty cycle of the interference signal;

[0012] S6: designing a shield waveform based on the obtained interference sampling duration and the interference sampling period, cross-arranging a high-frequency shield signal and a low-frequency protected signal, sending a shield signal during the interference sampling period, and sending a protected signal during the sampling stop period;

[0013] S7 filters the echo signal, removes the signal with a frequency higher than the preset value, and obtains the information of the real target through pulse compression.

[0014] In step S2, further comprising:

[0015] Perform constant false alarm detection on the range image result, obtain the corresponding threshold value, compare the value of the echo signal with the threshold value, if the value of the echo signal is greater than the threshold value, it is judged that there is a target, and the coordinate information of each peak point is obtained; otherwise, it is judged that there is no target.

[0016] According to a method for designing a waveform for intermittent sampling direct forwarding interference resistance with intra-pulse segmented protection provided by the present invention, based on the coordinate information of each peak point obtained in step S2, an echo signal of the same length as the detection signal is intercepted backward at each peak point as an intercepted signal, and the intercepted signal and the detection signal are conjugate multiplied to obtain an integral sequence of the corresponding peak point.

[0017] In step S4, the real target peak point and the false target peak point are identified, further comprising the steps of:

[0018] Perform at least two rounds of segmented analysis on the integrated sequence of each peak point;

[0019] In each round of segmented analysis, the integral sequence of each peak point is equally divided into a plurality of sub-segments, the sub-segment energy of each sub-segment is obtained, and the sub-segment energy variance of each peak point is obtained;

[0020] The average value of the sub-segment energy variance corresponding to all peak points is used as the decision threshold;

[0021] If the sub-segment energy variance of any peak point is less than the decision threshold, the corresponding peak point is the true target peak point; if the sub-segment energy variance of any peak point is greater than or equal to the decision threshold, the corresponding peak point is the false target peak point;

[0022] The number of sub-segments obtained in each round of segmentation analysis is different, and the number of sub-segments is an integer greater than or equal to 1.

[0023] In step S4, the main peak and the secondary peak are judged for the identified false target peak point, further comprising the steps of:

[0024] The integral sequence of each false target peak point is summed to obtain the total energy of the corresponding false target peak point;

[0025] The total energy of all false target peak points is compared, and the false target peak point corresponding to the maximum value of the total energy is the false target main peak point, and the remaining false target peak points are the false target secondary peak points.

[0026] According to a method for designing an interference waveform for direct forwarding with intermittent sampling resistance and intra-pulse segmented protection provided by the present invention, the interference sampling duration is the duration of the square wave signal of the integral sequence of the main peak point of the false target; and the interference sampling period is the repetition period of the integral sequence of the main peak point of the false target.

[0027] In step S6, the design of the protection waveform specifically includes:

[0028] Extending the cover signal by a preset length and shortening the protected signal by the same preset length;

[0029] The shielding signal and the protected signal are equally divided into a preset number of segments respectively; the detection signal is divided into a preset number of segments with the interference sampling period as the period of the detection signal;

[0030] In each detection signal cycle, the divided shield signal sub-segments are arranged in front and the divided protected signal is arranged in the back to generate a shield waveform of the detection signal;

[0031] The preset number of segments is the ratio of the pulse width of the detection signal to the interference sampling period.

[0032] Among them, the design of the protection waveform should also include:

[0033] A carrier frequency difference between the cover signal and the protected signal is obtained, wherein the carrier frequency difference is greater than a bandwidth of the cover signal and the protected signal.

[0034] On the other hand, the present invention also provides a signal transmitting and receiving device, including a signal transmitter, a signal receiver and a waveform processing unit, wherein the waveform processing unit executes any step of the above-mentioned method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmentation cover, the signal transmitter is used to transmit a detection signal processed by the waveform processing unit, and the signal receiver is used to receive an echo signal of the detection signal.

[0035] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-mentioned methods for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmentation protection.

[0036] The method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmentation protection provided by the present invention has the following technical effects:

[0037] (1) By analyzing the peak point integral sequence, the parameters are estimated and the main peak of the true and false targets is judged from the integral sequence. The parameter estimation and waveform design are further combined. After estimating the interference parameters including the interference sampling duration and the interference sampling period, the cover waveform is designed according to the characteristics of the interference signal, which is conducive to making the subsequent sampled and forwarded signals fall within the cover band. At the receiving end, the interference signal can be filtered out by filtering the echo signal.

[0038] (2) At the receiving end, the interference signal is filtered out by filtering, which can effectively suppress the interference signal under low signal-to-interference ratio, improve the accuracy of true and false target identification, have strong anti-interference ability, and can effectively suppress the interference of intermittent sampling direct forwarding under low signal-to-interference ratio;

[0039] (3) The amount of calculation is small. There is no need to improve the radar equipment itself. Only simple calculations are performed in parameter estimation. The calculation speed is fast and the implementation complexity is small, which is conducive to saving implementation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 It is a flow chart of a method for designing a waveform for resisting intermittent sampling direct forwarding interference with intra-pulse segmentation protection provided by the present invention;

[0042] Figure 2 It is a waveform design schematic diagram of the waveform design method for anti-intermittent sampling direct forwarding interference with intra-pulse segmented protection provided by the present invention;

[0043] Figure 3 It is a schematic diagram of estimating the interference duty ratio of the anti-intermittent sampling direct forwarding interference waveform design method provided by the present invention for intra-pulse segmented protection;

[0044] Figure 4It is a schematic diagram of estimating the interference repetition period of the anti-intermittent sampling direct forwarding interference waveform design method provided by the present invention for intra-pulse segmentation protection;

[0045] Figure 5 1 is one of the experimental results schematic diagrams of the anti-intermittent sampling direct forwarding interference waveform design method for intra-pulse segmentation protection provided by the present invention;

[0046] Figure 6 FIG2 is a second schematic diagram of experimental results of the method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmented protection provided by the present invention;

[0047] Figure 7 FIG3 is a third schematic diagram of experimental results of the method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmented protection provided by the present invention;

[0048] Figure 8 FIG4 is a fourth schematic diagram of experimental results of the method for designing a waveform for resisting intermittent sampling direct forwarding interference with intra-pulse segmented protection provided by the present invention;

[0049] Fig. 9 FIG5 is a fifth schematic diagram of experimental results of the method for designing a waveform for resisting intermittent sampling direct forwarding interference with intra-pulse segmented protection provided by the present invention;

[0050] Fig.10 This is the sixth schematic diagram of the experimental results of the method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmented protection provided by the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In one embodiment, Figure 1 As shown, a method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmentation protection is characterized in that it includes the steps of:

[0053] S1 transmits a detection signal to obtain interference information of an intermittently sampled directly forwarded interference signal, and performs pulse compression on an echo signal of the detection signal to obtain a range image result;

[0054] Specifically, in step S1, the pulse compression process can be equivalent to a moving correlation process between the received echo signal and the transmitted detection signal, and its expression is:

[0055]

[0056] Among them, the detection signal length is C, the echo signal length is N, s(n) is the echo signal, is the conjugate of the detection signal;

[0057] S2 performs constant false alarm detection on the range image result to obtain the position information of each peak point in the range image result;

[0058] Specifically, in step S2, a constant false alarm rate (CFAR) is performed on the range image result to obtain a corresponding threshold value, and the value of the echo signal is compared with the threshold value. If the value of the echo signal is greater than the threshold value, it is determined that a target exists, and the coordinate information of each peak point is obtained; otherwise, it is determined that no target exists;

[0059] It should be noted that the present invention is not limited by a specific CFAR technology. The sliding window length, protection unit length, and false alarm probability in CFAR detection can be adaptively adjusted according to different application scenarios, and the present invention does not limit this.

[0060] S3 extracts the integral sequence (IIS) corresponding to each peak point based on the position information;

[0061] Specifically, based on the coordinate information of each peak point obtained in step S2, an echo signal of the same length as the detection signal is intercepted backward at each peak point as an intercepted signal, and the intercepted signal and the detection signal are conjugate multiplied to obtain an integral sequence of the corresponding peak point, that is, the energy distribution. The corresponding expression is:

[0062]

[0063] Among them, n p , p=1,2,3…is the location information of the peak point, s(n) is the echo signal, is the conjugate of the detection signal.

[0064] S4 identifies the real target peak point and the false target peak point based on the integral sequence corresponding to each peak point; performs main and secondary peak judgment on the identified false target peak point to obtain the false target secondary peak point and the false target main peak point;

[0065] Wherein, in step S4, identifying the real target peak point and the false target peak point includes the steps of:

[0066] The peak points of true and false targets are identified by the segmented accumulation method, and the integral sequence of each peak point is subjected to at least two rounds of segmented analysis to avoid the situation where the segment length is equal to the interference period;

[0067] In each round of segmentation analysis, the integral sequence of each peak point is equally divided into multiple sub-segments, and the sub-segment energy of each sub-segment is obtained;

[0068] Specifically, the integral sequence of each peak point is equally divided into M sub-segments, the number of segments is H, and the length of each segment is The IIS of each sub-segment is accumulated to obtain the sub-segment energy E i , energy E i The expression is as follows:

[0069]

[0070] Obtaining the sub-segment energy variance of each peak point, and taking the average value of the sub-segment energy variance corresponding to all peak points as the decision threshold;

[0071] If the sub-segment energy variance of any peak point is less than the decision threshold, the corresponding peak point is the true target peak point; if the sub-segment energy variance of any peak point is greater than or equal to the decision threshold, the corresponding peak point is the false target peak point;

[0072] The number of sub-segments obtained in each round of segmentation analysis is different, and the number of sub-segments is an integer greater than or equal to 1.

[0073] Step S4 further includes performing a main peak and a secondary peak judgment on the identified false target peak point:

[0074] Sum the integral sequence of each false target peak point to obtain the total energy of the corresponding false target peak point;

[0075] The total energy of all false target peak points is compared, and the false target peak point corresponding to the maximum value of the total energy is the false target main peak point, and the remaining false target peak points are the false target secondary peak points.

[0076] S5 processes the integral sequence corresponding to the main peak point of the false target, obtains the interference sampling duration and interference sampling period of the interference signal, and obtains the duty cycle of the interference signal;

[0077] It should be noted that the integral sequence IIS of the main peak point of the false target is similar to a square wave signal, which is the result of matching the interference signal with the reference signal. The duration of the square wave signal is the interference sampling duration, and the period of the square wave signal is the interference sampling period.

[0078] That is, the interference sampling duration is the length of the high amplitude segment of the integral sequence of the main peak point of the false target; and the interference sampling period is the repetition period of the integral sequence of the main peak point of the false target.

[0079] S6 designs a shielding waveform based on the obtained interference sampling duration and interference sampling period, cross-arranges the high-frequency shielding signal and the low-frequency protected signal, sends the shielding signal during the interference sampling period, and sends the protected signal during the sampling stop period. The waveform design diagram is shown in FIG. Figure 2 As shown, where t s Interference sampling duration, T s is the interference sampling period, and the cover signal is sent during the interference sampling duration, i.e., the shaded part in the figure;

[0080] It should be noted that the cover signal and the protected signal here can be arbitrary waveform signals, and they only need to be distinguished in the frequency domain for subsequent filtering processing;

[0081] Among them, the high-frequency cover signal and the low-frequency protected signal, high frequency and low frequency are a set of relative concepts, that is, the frequency of the cover signal is greater than the frequency of the protected signal;

[0082] Specifically, taking the LFM signal as an example, assuming that the estimated interference sampling period is T s , the estimated duty cycle is τ, and the pulse width of the transmitted signal is M times the interference sampling period, that is, T = MT s ;

[0083] In one embodiment, in order to reduce the influence of the accuracy of the duty cycle on the method provided by the present invention and reduce the dependence on the interference parameters obtained in step S5, a transition section is added when designing the cover waveform, that is, the cover signal is extended by a preset length and the protected signal is shortened by the same preset length; specifically, the length refers to the signal duration;

[0084] Waveform design diagram Figure 2 As shown, where t s Interference sampling duration, T s is the interference sampling period, and the cover signal is sent during the interference sampling period, that is, the shaded part in the figure, and the transition section added by the cover waveform is Figure 2 The black part shown;

[0085] After adding the transition section, the length of the cover signal is extended, and the duty cycle is set to τ′=(1+a)τ. The total duration of the cover signal is τ′T, and the total duration of the protected signal is (1-τ′)T;

[0086] The time domain expression of the obtained cover signal is:

[0087]

[0088] The time domain expression of the obtained protected signal is

[0089]

[0090] Where B is the bandwidth of the cover signal and the protected signal, K1 = B / τ′T, K2 = B / (1-τ′)T is the frequency modulation slope, f y 、f b are the carrier frequencies of the cover signal and the protected signal respectively;

[0091] Further, step S6 also includes designing a protection waveform:

[0092] The shielding signal and the protected signal are equally divided into a preset number of segments respectively; the detection signal is divided into a preset number of segments with the interference sampling period as the period of the detection signal;

[0093] In each detection signal cycle, the divided shield signal sub-segments are arranged in front and the divided protected signal is arranged in the back to generate a shield waveform of the detection signal;

[0094] Wherein, the preset number of segments is the ratio of the pulse width of the detection signal to the interference sampling period;

[0095] Specifically, the two signals are divided into M segments, and the transmitted signals are also transmitted in T s The design is divided into M segments for the cycle. In each cycle, the shielding signal sub-segment is in front and the protected signal is in the back. The final transmission signal is a cross arrangement of the two signals, such as Figure 2 As shown,

[0096] Assume that the length of the cover signal sub-segment is t r =τ′T / M, length of protected signal sub-segment t b =(1-τ′)T / M, the total transmission signal time domain expression after the design of the cover waveform is:

[0097] Furthermore, in order to distinguish the two signals in the frequency domain, it is required that the spectra of the two signals do not overlap, and the carrier frequency difference between the cover signal and the protected signal is obtained, and the carrier frequency difference is greater than the bandwidth of the cover signal and the protected signal, that is, f y -f b >B, so that the receiving end can filter out the interference signal through the bandpass filter.

[0098] S7 filters the echo signal, filtering out signals with a frequency higher than the preset value and filtering out signals with a higher frequency. At this time, both the interference signal and the cover signal will be filtered out, and the protected signal with a lower frequency will be retained. The information of the real target can then be obtained through pulse compression.

[0099] In one embodiment, an experiment is conducted based on the anti-intermittent sampling direct forwarding interference waveform design method for intra-pulse segmentation protection provided by the present invention to further illustrate the technical effect of the present invention:

[0100] The experimental scenarios include: the experimental platform is a 64-bit Window10 system, CPU2.8GHz, memory 8GB, Matlab2016a; it is assumed that there is a real target 6000 meters away from the radar in the scenario, with a speed of 200m / s, and a jammer at a distance of 10000 meters and a speed of 100m / s; the jammer forwarding mode is intermittent sampling direct forwarding, and the noise is Gaussian white noise.

[0101] The experiment content includes:

[0102] (1) Set the signal-to-interference ratio to -40 dB and the signal-to-noise ratio to 15 dB. Under different interference parameters, according to steps S1 to S5 of the above-mentioned intra-pulse segmented shielding anti-intermittent sampling direct forwarding interference waveform design method, estimate the interference sampling duty cycle and sampling repetition period. The estimated average error and estimation accuracy of different jammer duty cycles are as follows: Figure 3 , the estimated average error and accuracy of different interference sampling repetition periods are as follows Figure 4 .

[0103] (2) Select the interference parameter with the largest parameter estimation error in the above steps to conduct the experiment from step S6 to step S7 of the present invention, take the duty cycle as 0.35, and choose the interference period as 5us as a compromise;

[0104] In order to verify the effectiveness of the present invention, a conventional radar transmitting waveform LFM is selected for a control experiment. The obtained pulse compression and moving target detection results are shown in the figure below. Figure 5 and Figure 6 As shown;

[0105] The effect of the method of the present invention is verified under the worst estimation condition, and the pulse compression result obtained is as follows: Figure 7 As shown in Figure 2, the moving target detection results are as follows: Figure 8 shown.

[0106] (3) Further, the interference duty cycle and interference repetition sampling period are the same as those in the previous step (2), and 400 Monte Carlo simulations are performed according to all the steps of the method of the present invention under different signal-to-interference ratios to obtain the average interference peak value and the average target peak value. The ratio of the average interference peak value to the average target peak value varies with the signal-to-interference ratio. Fig. 9 As shown;

[0107] According to all the steps of the present invention at different signal-to-noise ratios, 400 Monte Carlo simulations are performed at each signal-to-noise ratio to obtain the average interference peak value and the average target peak value. The ratio of the average interference peak value to the average target peak value varies with the signal-to-noise ratio. Fig.10 shown.

[0108] Depend on Figure 3 As shown in Figure 2, when performing parameter estimation, the estimation accuracy of the interference duty cycle is mostly around 20%, and only when the duty cycle is 0.25 and 0.5, the estimation accuracy is higher, but the average estimation error of the duty cycle is small, within 2%. Figure 4 As shown, the estimation of the interference sampling repetition period is relatively accurate, and the accuracy can reach 100%.

[0109] contrast Figure 5-6 and Figure 7-8 It can be seen that after conventional LFM signal pulse compression, obvious false targets appear, and the peak value of the false target is much larger than the real target. However, after filtering and pulse compression of the waveform of the present invention, the false target is well suppressed, and the real target at a distance of 6000m can be detected.

[0110] Similarly, after MTD, the false target formed by the conventional LFM signal after interference is more obvious, while the intermittent sampling and forwarding interference cannot effectively interfere with the transmission waveform of the present invention.

[0111] Depend on Figure 9-10 It can be seen that when the signal-to-interference ratio is as high as -80dB, the ratio of the false target peak to the target peak is lower than -45dB, and it is difficult for the false target to form effective interference. It can be seen that the present invention achieves effective suppression of false targets formed by intermittent sampling direct forwarding interference under low signal-to-interference ratio.

[0112] Depend on Fig.10 It can be seen that when the signal-to-noise ratio is greater than 0 dB, the ratio of the false target peak to the target peak is lower than -30 dB, which achieves effective suppression of interference. The present invention is insensitive to the signal-to-noise ratio, that is, the implementation of the present invention and the realization of the technical effect are not easily affected by the signal-to-noise ratio.

[0113] Through the above experimental results, it can be found that the present invention realizes relatively accurate parameter estimation of intermittent sampling direct forwarding interference, and realizes effective filtering of interference signals at a lower signal-to-interference ratio by designing segmented cover waveforms and receiving-end filtering, thereby achieving the purpose of effectively suppressing false targets and accurately identifying true targets.

[0114] In another aspect, the present invention further provides a signal transmitting and receiving device, the device described herein and the above-mentioned pulse segmentation protection anti-intermittent sampling direct forwarding interference waveform design method can correspond to each other;

[0115] The device comprises a signal transmitter, a signal receiver and a waveform processing unit, wherein the waveform processing unit performs the steps of any one of the above-mentioned methods for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmented protection, wherein the signal transmitter is used to transmit a detection signal processed by the waveform processing unit, and the signal receiver is used to receive an echo signal of the detection signal;

[0116] The device realizes effective filtering of interference signals under low signal-to-interference ratio by designing segmented mask waveform and receiving-end filtering, thereby achieving the purpose of effectively suppressing false targets and accurately identifying true targets; at the echo signal receiving end, the interference signal is filtered out by filtering, which can realize effective suppression of interference signals under low signal-to-interference ratio, improve the accuracy of identifying true and false targets, have strong anti-interference ability, and can realize effective suppression of intermittent sampling direct forwarding interference under low signal-to-interference ratio.

[0117] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmented protection provided by the above methods. The method includes: S1 transmitting a detection signal to obtain interference information of an intermittent sampling direct forwarding interference signal, and performing pulse compression on the echo signal of the detection signal to obtain a range image result; S2 performing constant false alarm detection on the range image result to obtain the position information of each peak point in the range image result; S3 extracting each peak point based on the position information. The corresponding integral sequence is S4; based on the integral sequence corresponding to each peak point, the real target peak point and the false target peak point are identified; the main and secondary peaks are judged for the identified false target peak points, and the false target secondary peak points and the false target main peak points are obtained; S5 processes the integral sequence corresponding to the false target main peak point to obtain the interference sampling time and interference sampling period of the interference signal; S6 designs a cover waveform based on the obtained interference sampling time and interference sampling period, sends a cover signal during the interference sampling period, sends a protected signal during the sampling stop period, and cross-arranges the high-frequency cover signal and the low-frequency protected signal; S7 filters the echo signal to filter out signals higher than the preset frequency value, and obtains the information of the real target through pulse compression.

[0118] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmentation protection provided by the above-mentioned methods, the method comprising: S1 transmitting a detection signal to obtain interference information of an intermittent sampling direct forwarding interference signal, performing pulse compression on an echo signal of the detection signal to obtain a range image result; S2 performing constant false alarm detection on the range image result to obtain the position information of each peak point in the range image result; S3 extracting the integral sequence corresponding to each peak point based on the position information; S4 extracting the integral sequence corresponding to each peak point based on the position information; The integral sequence is used to identify the real target peak point and the false target peak point; the main and secondary peaks are judged for the identified false target peak point to obtain the false target secondary peak point and the false target main peak point; S5 processes the integral sequence corresponding to the false target main peak point to obtain the interference sampling time and interference sampling period of the interference signal; S6 designs a cover waveform based on the obtained interference sampling time and interference sampling period, sends a cover signal during the interference sampling period, sends a protected signal during the sampling stop period, and cross-arranges the high-frequency cover signal and the low-frequency protected signal; S7 filters the echo signal to filter out the signal higher than the preset frequency value, and obtains the information of the real target through pulse compression.

[0119] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0120] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segment protection, characterized in that: Includes steps: S1 transmits a detection signal to obtain the interference information of the intermittent sampling direct forwarding interference signal, and performs pulse compression on the echo signal of the detection signal to obtain the range image result; S2 performs constant false alarm detection on the range image result to obtain the position information of each peak point in the range image result; S3 extracts the integral sequence corresponding to each peak point based on the position information; S4 identifies the real target peak point and the false target peak point based on the integral sequence corresponding to each peak point; Performing main and secondary peak judgment on the identified false target peak points to obtain false target secondary peak points and false target main peak points; S5 processes the integral sequence corresponding to the main peak point of the false target to obtain the interference sampling duration and interference sampling period of the interference signal; S6 designs a shield waveform based on the obtained interference sampling duration and the interference sampling period, and cross-arranges a high-frequency shield signal and a low-frequency protected signal; sends a shield signal during the interference sampling period, and sends a protected signal during the sampling stop period; S7 filters the echo signal, removes the signal with a frequency higher than the preset value, and obtains the information of the real target through pulse compression; Wherein, step S6, when designing the protection waveform, specifically includes: Extending the cover signal by a preset length and shortening the protected signal by the same preset length; The shielding signal and the protected signal are equally divided into a preset number of segments respectively; the detection signal is divided into a preset number of segments with the interference sampling period as the period of the detection signal; In each detection signal cycle, the divided shield signal sub-segments are arranged in front and the divided protected signal is arranged in the back to generate a shield waveform of the detection signal; The preset number of segments is the ratio of the pulse width of the detection signal to the interference sampling period.

2. The method for designing an anti-intermittent sampling direct forwarding interference waveform with intra-pulse segment protection according to claim 1 is characterized in that: In step S2, a constant false alarm detection is performed on the range image result to obtain a corresponding threshold value, and the value of the echo signal is compared with the threshold value. If the value of the echo signal is greater than the threshold value, it is determined that a target exists, and the coordinate information of each peak point is obtained; otherwise, it is determined that no target exists.

3. The method for designing an anti-intermittent sampling direct forwarding interference waveform with intra-pulse segment protection according to claim 2 is characterized in that: Based on the coordinate information of each peak point obtained in step S2, an echo signal of equal length to the detection signal is intercepted backward at each peak point as an intercepted signal, and the intercepted signal and the detection signal are conjugate multiplied to obtain an integral sequence of the corresponding peak point.

4. The method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segment protection according to claim 1 is characterized in that: In step S4, the real target peak point and the false target peak point are identified, including the steps of: Perform at least two rounds of segmented analysis on the integrated sequence of each peak point; In each round of segmented analysis, the integral sequence of each peak point is equally divided into multiple sub-segments, the sub-segment energy of each sub-segment is obtained, and the sub-segment energy variance of each peak point is obtained; The average value of the sub-segment energy variance corresponding to all peak points is used as the decision threshold; If the sub-segment energy variance of any peak point is less than the decision threshold, the corresponding peak point is the true target peak point; if the sub-segment energy variance of any peak point is greater than or equal to the decision threshold, the corresponding peak point is the false target peak point; The number of sub-segments obtained in each round of segmentation analysis is different, and the number of sub-segments is an integer greater than or equal to 1.

5. The method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segment protection according to claim 4 is characterized in that: In step S4, the main peak and the secondary peak are judged for the identified false target peak point, including the steps of: The integral sequence of each false target peak point is summed to obtain the total energy of the corresponding false target peak point; The total energy of all false target peak points is compared, and the false target peak point corresponding to the maximum value of the total energy is the false target main peak point, and the remaining false target peak points are the false target secondary peak points.

6. The method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segment protection according to claim 1 is characterized in that: The interference sampling duration is the duration of the square wave signal of the integral sequence of the main peak point of the false target; and the interference sampling period is the repetition period of the integral sequence of the main peak point of the false target.

7. The method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segment protection according to claim 1 is characterized in that: A carrier frequency difference between the cover signal and the protected signal is obtained, wherein the carrier frequency difference is greater than a bandwidth of the cover signal and the protected signal.

8. A signal transmitting and receiving device, comprising a signal transmitter, a signal receiver and a waveform processing unit, characterized in that: The waveform processing unit executes the steps of the waveform design method for anti-intermittent sampling direct forwarding interference with intra-pulse segmented protection as described in any one of claims 1 to 7, the signal transmitter is used to transmit the detection signal processed by the waveform processing unit, and the signal receiver is used to receive the echo signal of the detection signal.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for designing a waveform for anti-intermittent sampling direct forwarding interference with intra-pulse segmentation protection as described in any one of claims 1 to 7 are implemented.

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