Azimuth super-resolution method for scanning radar forward-looking imaging

A forward-looking imaging and scanning radar technology, used in instruments, measuring devices, and re-radiation, etc., can solve the problems of limited resolution improvement, only smoothing effect, and inability to distinguish multiple targets.

Active Publication Date: 2021-04-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0003] In the prior art, the monopulse technique can be used to achieve high azimuth resolution for a single target, but this method cannot distinguish multiple targets in the same lobe; in addition, the azimuth resolution can be improved by using the Wiener filter method , but this method only has a smoothing effect, and the resolution improvement is limited; while the truncated singular value decomposition (TSVD) method is used to suppress noise amplification by truncating smaller singular values, but due to information loss after truncation, the resolution improvement is limited

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  • Azimuth super-resolution method for scanning radar forward-looking imaging
  • Azimuth super-resolution method for scanning radar forward-looking imaging
  • Azimuth super-resolution method for scanning radar forward-looking imaging

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Embodiment Construction

[0101] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0102] see figure 1 , the present invention proposes a scanning radar forward-looking imaging azimuth super-resolution method, which is realized by the following steps:

[0103] S1. The radar transmits the linear frequency modulation signal, receives the echo signal, and performs pulse compression and distance walking correction processing on the echo signal.

[0104] In this embodiment, the motion geometric relationship of the airborne forward-looking scanning radar is as follows: figure 2 As shown, the parameters of the radar system are shown in Table 1 below.

[0105] parameter value carrier frequency 10GHz platform speed 100m / s signal bandwidth 60MHz signal duration 2μs scan range ±5° scanning speed 30° / s Antenna Beamwidth 3° pulse repetition frequency 1000Hz Sampling Rate 72M...

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Abstract

The invention provides a scanning radar forward-looking imaging azimuth super-resolution method, which belongs to the field of radar imaging. Aiming at the problem of low azimuth resolution of radar forward-looking imaging, the invention improves the azimuth resolution of radar forward-looking imaging through a Bayesian deconvolution method. In the present invention, firstly, the noise obeys the complex Gaussian distribution, and the target obeys the Laplace distribution; then, under the Bayesian framework, the super-resolution problem is transformed into a convex optimization problem based on the maximum a posteriori estimation; finally, the LBWK (linearized Bregman with kicking) algorithm to solve convex optimization problems and realize azimuth super-resolution imaging. The innovation of the present invention is that the prior distribution of the target and noise is introduced, and the matrix inversion operation is avoided in the solution process, the noise amplification is effectively suppressed, and the time loss caused by the inversion operation is reduced, so it has more Good super-resolution performance.

Description

technical field [0001] The invention belongs to the field of radar imaging, in particular to a scanning radar forward-looking imaging azimuth super-resolution method. Background technique [0002] Realizing high-resolution imaging of radar forward-looking areas is of great significance in applications such as autonomous landing of aircraft, precise guidance of weapons, and disaster search and rescue. Although existing radar systems such as Synthetic Aperture Radar (SAR) and Doppler Beam Sharpening (DBS) can achieve high-resolution imaging in azimuth and distance, they cannot be used in forward-looking areas. Real-aperture scanning radar can realize forward-looking area imaging, but due to the limitation of antenna aperture, its azimuth resolution is low, which cannot meet the needs of high-resolution imaging. Although the azimuth resolution of scanning radar can be improved by increasing the antenna aperture, it is difficult to realize in practical applications due to the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/89
CPCG01S13/89
Inventor 张寅张启平张文涛庹兴宇毛德庆张永超裴季方郭德明黄钰林杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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