Segmental matching filtering processing method for intermittent modulation signal
A segmented matching filter and signal modulation technology, which is applied to radio wave measurement systems and instruments, can solve the problems of larger simulation system scale, increased cost, and cover, and achieve the effect of solving self-interference and eliminating interference
Active Publication Date: 2017-10-20
NAT UNIV OF DEFENSE TECH
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[0003] The traditional way of processing intermittent modulation signals is to use long-pulse matched filters to perform matched filtering on intermittent modulation signals. However, using long-pulse matching will cause the matching output to contain a series of false target pulse trains. If there are small targets around the target, false target strings will cover the signal of weak and small targets, and the detection performance must be improved through signal processing and information screening in the later stage, so the scale of the simulation system becomes larger and the cost increases
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[0024] At present, the present invention is only applicable to radar chirp signals, and the method of segmented matched filtering for intermittent modulated signals proposed by the present invention will be further explained in conjunction with the accompanying drawings. figure 1 Is a brief flow chart of the present invention, Figure 5 It is a system block diagram designed based on the method proposed by the present invention. The present invention specifically involves the following steps:
[0025] Step 1: Sampling the chirp signal to generate an intermittent modulation signal.
[0026] A chirp signal a(t) with a bandwidth of B and a pulse width of T is generated by the signal generator, and the period is T s The square wave pulse train signal p(t) of unit amplitude is used as the sampling signal to modulate the chirp signal, and the intermittent modulation signal x(t) obtained is: x(t)=a(t)·p(t), the process Such as figure 2 Shown. Among them, the sampling pulse duration t s E...
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The invention relates to a segmental matching filtering processing method for an intermittent modulation signal. The method comprises steps that step 1, a linear frequency modulation signal is sampled to generate the intermittent modulation signal; step 2, a segmental matching filter of the intermittent modulation signal is designed; step 3, segmental matching filtering processing on the intermittent modulation signal is carried out to analyze target characteristics of an output signal; and step 4, optimal segmental matching filtering of the intermittent modulation signal is realized. The method is advantaged in that firstly, a false target pulse string self interference problem caused by discontinuous frequency spectrum of the intermittent modulation signal is solved, and secondly, interference from a false target pulse string on weak target signals is eliminated; the optimal effect of the segmental matching filter is that the false target pulse string can be completely inhibited, only the actual target signal is outputted, and interference of the false target pulse string on the weak target signals is eliminated.
Description
Technical field [0001] The invention belongs to the field of radar signal processing, and specifically relates to a processing technology for radar intermittent modulation signals, in particular to a segmented matched filter processing method for intermittent modulation signals. Background technique [0002] Radar system's internal field radiation simulation is in the internal field environment represented by the microwave anechoic chamber, through various simulation techniques and theoretical methods equivalent means, to truly reproduce the actual radar electromagnetic wave generation, radiation, propagation, target scattering, All processes such as receiving and processing. Compared with external field radiation simulation, internal field radiation simulation has unique advantages such as good confidentiality, high flexibility, and strong repeatability. Simulation of narrowband radar in the infield can realistically reproduce the detection and tracking process of radar in comp...
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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 冯德军解东王俊杰潘小义张文明傅其祥徐振海
Owner NAT UNIV OF DEFENSE TECH