A Multi-target Detection Method Based on Gray Complementary Waveform
A detection method and multi-target technology, which is applied in the field of multi-target detection based on Gray complementary waveforms, can solve problems such as submergence and missed detection, and achieve the effects of energy reduction, simple calculation, and good results
Active Publication Date: 2019-07-23
NAT UNIV OF DEFENSE TECH
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However, based on the principle that the energy of the ambiguity function will not be changed by linear operations, this method actually superimposes the energy of the suppressed range sidelobe on other unsuppressed range sidelobes, which makes the method obtain The residual range sidelobe energy in the blur function image is higher than that in the gray complementary waveform image of the standard emission sequence, so in the case of multiple targets, the weak target in the blur function image obtained by this method may be Submerged in the range sidelobes produced by strong targets, resulting in missed detections
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[0037] figure 2 It is the realization flowchart of the present invention. The specific implementation method comprises the following steps:
[0038] In the first step, the Doppler of all targets in the detection scene is estimated, and the Doppler estimates of all targets are obtained. For the specific estimation method, please refer to Chapter 2.3.4 of W.Dang, Signal Design for Active Sensing, Ph.DDissertation, Colorado State University, 2014. It will not be repeated here.
[0039] In the second step, according to the Doppler estimation values of all targets, the Gray complementary waveform signals are transmitted in a specific transmission sequence, and then matched filtering is performed according to the standard matched filtering weight to obtain the blur function image.
[0040] Suppose there are H targets in the detection scene, A h with are the normalized amplitude of the hth target (the normalized amplitude value can be read directly from the amplitude value at t...
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The present invention discloses a multi-target detection method based on a Golay complementary waveform. The method comprises the steps of estimating the Doppler of all targets in a detection scene to obtain the Doppler estimated values of all targets; according to the Doppler estimated values of all targets, emitting a Golay complementary waveform signal according to the specific emission sequence, and then carrying out the matching filtering on the Golay complementary waveform signal and a matching filtering signal having a standard matching filtering weight to obtain a fuzzy function image; emitting the Golay complementary waveform signal of a standard emission sequence, and then carrying out the matching filtering on the Golay complementary waveform signal according to the matching filtering weight of a binomial design method to obtain a fuzzy function image; obtaining the minimum value of each pixel point of the two obtained fuzzy function images one by one, and obtaining the final fuzzy function image as a final result. The multi-target detection method of the present invention enables the energy of the range sidelobe in the final result to be reduced effectively and the missing detection of the targets to be reduced, and can detect the weak targets in the multiple targets more easily.
Description
technical field [0001] The invention relates to the field of radar signal processing, in particular to a multi-target detection method based on Gray complementary waveforms. Background technique [0002] Golay Complementary Waveforms are composed of two binary sequences x(l) and y(l), where the values of x(l) and y(l) are 1 or -1, l=0,1, ..., L-1, L is the length of each binary sequence, such two binary sequences that form the Gray complementary waveform are called Gray complementary pairs (the specific Gray complementary pair generation method can refer to the literature: M.Golay, " Complementary series," IRE Trans. Inform. Theory, vol.7, no.2, pp.82-87, Apr.1961.). The time width occupied by each 1 or -1 value in the Gray complementary pair is T c , so the time width of each Golay complementary pair is LT c . For k=-(L-1),...,(L-1), the Gray complementary waveform satisfies the following conditions [0003] C x (k)+C y (k)=2Lδ(k) [0004] where C x (k) and C y ...
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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 朱家华王学智黄晓涛索菲亚·苏波若娃比尔·莫兰
Owner NAT UNIV OF DEFENSE TECH