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Radar compression sampling method based on prepulse processing, and radar compression sampling system

A technology of compressed sampling and pre-pulse, applied in radio wave measurement systems, instruments, etc., to solve the problem of inability to use clutter to suppress signal gain

Inactive Publication Date: 2015-12-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0007] In order to overcome the problem that the traditional radar compression sampling method and system cannot use the signal gain brought by clutter suppression and coherent accumulation, the technical solutions adopted are as follows:

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  • Radar compression sampling method based on prepulse processing, and radar compression sampling system

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Embodiment Construction

[0068] The present invention will be further described below in conjunction with specific examples, but the present invention is not limited by the examples.

[0069] combine Figure 1 to Figure 4 The radar compression sampling method and system based on pre-pulse processing in the present invention are described in detail:

[0070] The compressed sampling steps of the radar signal are as follows:

[0071] Step 1: Mix the radar signal x(t) with an analog pseudo-random sequence p(t)={1,-1} to obtain the corresponding mixed signal x p (t)=x(t) p(t); the bandwidth of the pseudo-random sequence p(t) is identical to the bandwidth of the radar signal x(t); the pulse width of the radar signal is B=2GHz; the radar The number of signal transmission points is N=64, the pulse transmission frequency is PRF=250MHz, and the carrier frequency is Fi=20GHz; the number of targets contained in the radar signal is K=2, and the number of clutter is Kc=4.

[0072] The frequency mixing step sprea...

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Abstract

The invention provides a radar compression sampling method based on prepulse processing, and a radar compression sampling system. The radar compression sampling method and the radar compression sampling system belong to the technical field of radar signal processing. The radar compression sampling method comprises the steps of a first step, performing frequency mixing on an input analog signal by means of an analog pseudo-random sequence, thereby obtaining a mixing signal; a second step, filtering the mixing signal by means of a low-pass filter, and obtaining a filtering signal; a third step, sampling the input analog signal by means of a low-speed A / D converter (ADC), thereby obtaining a sampled digital signal; a fourth step, performing pulse clutter suppression / coherent accumulation processing on the sampled digital signal by means of a moving target indicator (MTI) and a moving target detector (MTD); and a fifth step, reconstructing the signal which is obtained after processing in the fourth step by means of a compression reconstruction algorithm. The radar compression sampling method and the radar compression sampling system have advantages of low complexity, easy realization, etc.

Description

technical field [0001] The invention relates to a radar compression sampling method and system based on pre-pulse inter-processing, and belongs to the technical field of radar signal processing. Background technique [0002] Traditional radar compression sampling system is based on analog-information converter (AnalogtoInformationConverter, AIC). First use an analog pseudo-random sequence to mix the analog signal, then pass the mixed signal through a low-pass filter, and then use a low-speed analog / digital converter (AnalogtoDigitalConverter, ADC) to undersample the filtered signal, and finally The product of the equivalent matrix of frequency mixing and low-pass filtering and the sparse matrix is ​​used as the observation matrix, and the reconstruction algorithm of compressed sensing is used to restore the original signal from the under-sampled signal. [0003] GuangmingShi proposed a waveform matching (WaveformMatch, WM) sparse dictionary for radar signal compression samp...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 郇浩李啸陶然
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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