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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 the problems of false tracks, energy diffusion, and detection performance degradation, and achieve the effect of overcoming distance walking and reducing the amount of calculation.

Inactive Publication Date: 2014-08-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

[0049] Generation of signal model and simulation data in this embodiment:

[0050] In the radar system in this example, the signal transmitted at the transmitter is a linear frequency modulation (Linear Frequency Modulation, LFM) signal.

[0051] The radar system transmits into the air with a carrier frequency of f c , the pulse width is T 0 , the FM slope is Kr the 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:

[0052] 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 radar weak target detection method for the weak target detection method in the prior art, which causes distance walking due to increased accumulation time and the false track of the target formed by the traditional DP-TBD algorithm due to the reunion effect. Including the steps: A, performing pulse compression on each frame of radar echo data along the fast time dimension; B, performing Keystone transformation on each frame of the compressed signal in the frequency domain; C, performing each frame after the above steps Transform the signal into the time domain and perform coherent accumulation in the slow time dimension; D. Remove weak points on the sequence; E. Perform DP-TBD processing on the K frame signal processed by the above steps based on direction weighting; K is a positive integer , set by the radar parameters. The invention not only can detect weak targets, but also can accurately restore the track 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 Patents(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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