Sparse singular value decomposition scanning radar forward-looking imaging method

A singular value decomposition and scanning radar technology, which is applied in the field of scanning radar forward-looking azimuth high-resolution imaging, can solve problems such as the influence of azimuth resolution and the loss of target information, and achieve the effect of reducing noise amplification and imaging results

Active Publication Date: 2017-09-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, in this method, the method of truncating the singular value is used to suppress the noise amplification, and at the same time, the target information will also be lost, and the azimuth resolution will be affected.

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  • Sparse singular value decomposition scanning radar forward-looking imaging method
  • Sparse singular value decomposition scanning radar forward-looking imaging method
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Embodiment Construction

[0050] In order to facilitate those skilled in the art to understand the technical content of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0051] Such as figure 1 Shown is the method flowchart of the present invention, and the geometric model of forward-looking scanning radar motion process is as attached figure 2 As shown, the simulation parameters of the platform system are shown in Table 1. target distribution as image 3 As shown, set multiple azimuth targets to verify the effect of azimuth resolution. According to the simulation parameters, the number of sampling points in the range direction is M r , the number of azimuth sampling points is N r .

[0052] Table 1 Simulation parameters of the platform system

[0053] parameter

value

Carrier frequency f c

10GHz

Bandwidth B

75MHz

Antenna scan range

-10°～10°

Antenna Beamwidth

3°

...

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Abstract

The invention provides a sparse singular value decomposition scanning radar forward-looking imaging method, which is used for the radar imaging technology field. A radar forward-looking echo signal is analyzed and scanned, and an azimuth echo model of a target scattering coefficient and antenna measuring matrix operation is constructed, and then an azimuth high resolution problem is converted into a matrix inversion problem. A target function is constructed by adopting the sparse singular value decomposition method provided by the invention. The solution of the echo azimuth signal is realized by adopting an iterative strategy. A limitation of conventional TSVD methods of contradiction between resolution improvement and noise suppression is broken through, and sensitivity of an imaging result to noises is reduced, and therefore the azimuth resolution improvement is realized.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to high-resolution imaging of forward-looking azimuth directions of scanning radars. Background technique [0002] Radar is widely used in military and civilian fields due to its all-weather and all-weather characteristics. The realization of radar forward-looking imaging is of great significance in the fields of precision guidance and autonomous landing of aircraft. However, in the traditional radar imaging method, although the real beam echo signal in the forward-looking area can be obtained by scanning the radar, the aperture size and imaging method limit the azimuth resolution of the imaging area, and it is difficult to meet the resolution requirements of practical applications. need. Therefore, it is of great significance to improve the resolution of the front view area by using the method of signal processing. [0003] Literature "Q.Huang, L.Qu, B.Wu, et a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89G01S7/41
CPCG01S7/41G01S13/89
Inventor 张寅吴阳李昌林沙连童毛德庆徐帆云黄钰林杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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