Method for detecting weak target by radar

A technology of weak targets and detection methods, applied in radio wave measurement systems, instruments, etc., can solve problems such as energy diffusion, false track, and detection performance degradation, and achieve the effect of reducing the amount of calculation and overcoming distance walking

Inactive Publication Date: 2013-01-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, when the signal-to-noise ratio of the radar echo is much lower than 0dB, its detection performance degrades severely
In addition, when DP-TBD processing is performed on the echo, there will be energy dispersion, so that many false tracks will appear when recovering the track

Method used

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  • Method for detecting weak target by radar
  • Method for detecting weak target by radar
  • Method for detecting weak target by radar

Examples

Experimental program
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Embodiment

[0048] Generation of signal model and simulation data in this embodiment:

[0049] In the radar system in this example, the signal transmitted at the transmitter is a linear frequency modulation (Linear Frequency Modulation, LFM) signal.

[0050] The radar system transmits into the air with a carrier frequency of f c , the pulse width is T 0 , the FM slope is K rthe LFM signal. The target echo will contain target Doppler frequency shift and delay information, and the target echo of the nth pulse in the kth frame can be expressed as:

[0051] S r ( k , n , t ) = Rect ( t - τ n T 0 ) exp ( ...

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Abstract

The invention relates to radar target detection technology. The invention discloses a method for detecting a weak target by a radar, aiming at the defects that the method for detecting the weak target in the prior art causes distance walking due to the increment of accumulation time and the target false track is formed by aggregation effect in the traditional dynamic programming-track before detect (DP-TBD) algorithm. The method comprises the steps of A. carrying out pulse compression on each frame of radar return data along the rapid time dimension; B. carrying out keystone conversion on each frame of compressed signal in the frequency domain; C. converting each frame of processed signal into time domain, and carrying out the phase-coherent accumulation of slow time dimension; D. removing weak points from the sequence; E. carrying out direction weight-based DP-TBD treatment on the K frames of signals which are processed in the above steps, wherein K is a positive integer and is set according to radar parameters. The method not only can be used for detecting the weak target, but also can accurately recover the trace of the target.

Description

technical field [0001] The invention relates to radar target detection technology, in particular to the detection technology under the condition that the signal-to-noise ratio of the target echo is low and the target echo appears to move across distance units. Background technique [0002] With the maturity of stealth technology, the RCS of aircraft, missiles and other targets is reduced by one to two orders of magnitude, which greatly affects the power of radar. Therefore, the detection of weak targets has become a technical problem that radar needs to solve urgently. For weak target detection, there are mainly two methods currently used: one is long-term coherent accumulation technology, and the other is non-coherent accumulation tracking-before-detection technology. [0003] For the long-term coherent accumulation technology, the coherent accumulation algorithm based on FFT (Fast Fourier Transform) is mainly used at present. The main idea of ​​the algorithm is to improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 张顺生董纪私杨雄
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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