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Airborne radar real-time Doppler beam sharpening super-resolution imaging method

A Doppler beam and super-resolution imaging technology, applied in the field of airborne radar real-time Doppler beam sharpening super-resolution imaging, can solve the problem of high computational complexity, inability to realize DBS real-time super-resolution imaging, and reduce computational complexity, etc. question

Active Publication Date: 2019-04-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of high computational complexity and redundant iterations in the prior art, which lead to the inability to realize DBS real-time super-resolution imaging, and propose a real-time Doppler beam sharpening super-resolution imaging method for airborne radar. By means of scanning-acquisition-processing at the same time, for the echo signals of the current adjacent coherent processing interval (CPI), the fast iterative weighted least squares estimation is used to realize DBS super-resolution imaging, and then the azimuth echo of the adjacent CPI is used. Spatial correlation, recursively update the next CPI weighted least squares estimation result, thereby improving the convergence speed and greatly reducing the computational complexity

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Embodiment Construction

[0059] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0060] see figure 1 , the present invention provides a real-time Doppler beam sharpening super-resolution imaging method for airborne radar, which is realized by the following steps:

[0061] S1. Acquire current coherent process interval (Coherent process interval, CPI) echo signals, and perform pulse compression and distance walking correction processing on the echo signals.

[0062] In this embodiment, the schematic diagram of the geometric model of the airborne scanning radar is as follows figure 2 As shown, the parameters of the radar platform are shown in the following table (1), and the original scene graph of the target is shown in image 3 As shown, the set rhombic array point target proves the effectiveness of the method of the present invention.

[0063] parameter

symbol

value

carrier frequency

f 0

30.75GHz ...

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Abstract

The invention provides an airborne radar real-time Doppler beam sharpening super-resolution imaging method, and belongs to the field of radar detection and imaging. Through a method of scanning-whileobtaining-while processing, Doppler beam sharpening (DBS) super-resolution imaging is realized by fast iterative weighted least squares estimation for echo signals of current adjacent coherent processintervals (CPI), and a next CPI weighted least squares estimation result is recursively updated by utilizing the spatial correlation of adjacent CPI azimuth echoes, so that the convergence speed is improved, and computational complexity is greatly reduced. Compared with a traditional DBS imaging technology, the airborne radar real-time Doppler beam sharpening super-resolution imaging method not only can effectively improve the imaging resolution, but also can reduce the iteration times, the convergence speed is improved, and the imaging resolution is ensured while the real-time capability ofimaging is met.

Description

technical field [0001] The invention belongs to the field of radar detection and imaging, in particular to an airborne radar real-time Doppler beam sharpening super-resolution imaging method. Background technique [0002] Doppler beam sharpening (DBS) imaging has the characteristics of wide imaging angle of view and good real-time performance, and is widely used in ground reconnaissance, terrain mapping, aircraft navigation, etc. Traditional DBS imaging is mainly based on the fast Fourier transform (FFT) spectral analysis method, which has low resolution and cannot meet the imaging resolution requirements in applications such as helicopter autonomous landing at slow speeds. Therefore, the super-resolution spectral estimation algorithm based DBS imaging techniques have been extensively studied. [0003] In order to improve the DBS imaging resolution, there is a DBS super-resolution imaging method in the prior art, which can improve the DBS imaging resolution, but this method...

Claims

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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 张永超毛德庆康瑶徐帆云庹兴宇张启平张寅黄钰林杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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