Anti-signal-dependent-interference cognitive constant modulus waveform design method
A waveform design and dependent technology, which is applied in the field of radar anti-jamming, waveform design and interference suppression, can solve the problems of reducing waveform utilization rate and unable to suppress fast-time forwarding type interference, etc.
Active Publication Date: 2017-07-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
Most of the existing waveform design criteria functions for anti-clutter and electronic interference are detection probability, signal-interference / clutter / noise ratio (Signal-Interference / Clutter / Noise Ratio, SICNR), integrated sidelobe level (Integrated Sidelobe Level, ISL ) and information KL (Kullback-Leibler) divergence, etc., the waveform must be redesigned for different delays or multiple interference situations, which reduces the waveform utilization
And it cannot suppress fast-time forwarding interference, that is, interference that is forwarded within a pulse repetition period (Pulse Repetition Period, PRT)
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[0048]The present invention mainly adopts the method of computer simulation for verification, and all steps and conclusions are verified correctly on MATLAB-R2014a. The specific implementation steps are as follows:
[0049] Step 1. Initialize parameters:
[0050] The initialization system parameters include: the number of sub-pulses in the pulse N=128, the iteration convergence coefficient ε 1 =10 -5 , ε 2 =10 -4 , taking SMSP interference as an example, the number of sampling is L=16, and the number of repetitions is q=8, so the signal transfer matrix J c for
[0051]
[0052] Step 2. Establish a mathematical model of the optimization problem:
[0053] 2.1. According to the waveform design criteria 1) reduce the integrated cross-correlation sidelobe level (ICSL) between the interference signal and the radar transmission signal to suppress the interference signal, and establish
[0054]
[0055] in,(·) H represents the conjugate transpose, is the mapping matrix...
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The invention discloses an anti-signal-dependent-interference cognitive constant modulus waveform design method, belongs to the technical field of radar anti-interference and especially relates to the technical field of waveform design and interference suppression. Existing anti-clutter and anti-electronic-interference waveform design criterion functions are mainly based on detection probability and signal-to-clutter ratio and the like, so that for different time delay interference, waveforms need to be redesigned, and besides, quick time forwarding type interference cannot be suppressed. The method adopts an in-pulse subpulse phase modulation waveform design mode to suppress the fast / slow forwarding type SD interference, and is characterized by, to begin with, establishing an interference suppression signal model by utilizing the idea of suppressing cross correlation between interference signals and emission signals, and on the basis of suppressing interference, suppression of auto-correlation sidelobe level and constant modulus constraints being taken into consideration; and then, for an established target problem function, providing a majorization-minimization iteration search optimization algorithm for simplification solving. The method can suppress SD interference very well and can keep low-sidelobe radar detection requirements.
Description
technical field [0001] The invention belongs to the technical field of radar anti-jamming, and in particular relates to the technical fields of waveform design and interference suppression. Background technique [0002] In modern warfare, the electromagnetic environment faced by radar systems is increasingly complex, such as clutter in cities, mountains and other places, electronic deception by duplicating false targets, etc. Signal-Dependent (Signal-Dependent, SD) interference is a type of interference that is linearly correlated with the signal itself, such as SMSP (SMeared SPectrum) distance deception electronic interference. The jammer intercepts and replicates the radar transmission signal to form SMSP interference and transmits it to the radar receiver. The machine causes many false targets to appear after the radar matched filter detection, which seriously interferes with the normal detection work of the radar. Therefore, it is of great significance to improve the ra...
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IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 崔国龙卢术平付月黎明余显祥易伟孔令讲杨晓波张天贤
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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