Radar distance super-resolution method

A super-resolution and distance technology, applied in the field of distance super-resolution technology, can solve problems such as high signal-to-noise ratio, difficult to meet, multi-sample, etc., and achieve the effect of high distance resolution ability

Pending Publication Date: 2022-03-11
南京国睿防务系统有限公司
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Problems solved by technology

These methods usually require an estimated number of sources, a higher signal-to-noise ratio, and more samples, which may be difficult to meet in practice

Method used

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Embodiment Construction

[0015] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0016] Set the simulation conditions: the time width of the LFM signal T=400μs, the bandwidth B=1MHz, the sampling frequency f s = 4MHz, so the distance resolution of conventional matched filter pulse pressure is 150m, the distance between two targets is 112.5m, the echo SNR is 10dB, and the static or Doppler frequency is equal to 200Hz.

[0017] The distance super-resolution processing is performed on the echo signal of the stationary target, and the result is as follows: figure 1 As shown, two distinct peaks can be seen, and the two targets become resolved. For comparison, the results of the conventional matched filter pulse pressure are also given, such as figure 2 As shown, due to the close proximity of the two targets, the main lobes of pulse pressure overlap and cannot be distinguished.

[0018] Perform distance super-resolution ...

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Abstract

The invention discloses a radar distance super-resolution method, which is based on the sparsity of a radar target concerning the target in an observation space, the radar transmits a linear frequency modulation signal, the bandwidth of the radar signal is kept unchanged, and the linear frequency modulation echo signal of the radar target is dechirped in a frequency domain to become a complex sine wave. The method is used for establishing a distance dimension sparse mathematical model of a multi-target echo signal, constructing and solving a convex optimization function about a target distance, obtaining the target distance, separating targets close in the distance and realizing radar distance super-resolution, and has higher distance resolution capability compared with conventional pulse compression processing, so that the radar distance super-resolution efficiency is improved. And the performances of target classification identification, imaging, distance measurement and target detection in clutter are improved.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a distance super-resolution technology. Background technique [0002] In the radar system, improving the range resolution is an important means to improve target detection in clutter, and it is also the basis for target classification recognition, imaging and distance measurement. Modern radars emit large time-width-bandwidth product signals, and the range resolution is improved through pulse compression, which is inversely proportional to the radar signal bandwidth. Further improvements in resolution require increased signal bandwidth, which is sometimes difficult or prohibitively expensive. Therefore, it is necessary to study the problem of distance super-resolution without increasing the bandwidth. [0003] Represented by MUSIC spectrum estimation, there are many research results on space / time super-resolution spectrum estimation technology. Later...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G06F17/15G06F17/16
CPCG01S13/88G06F17/15G06F17/16
Inventor 刘云申敖呈欢张弘陈帅
Owner 南京国睿防务系统有限公司
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