A Radar Angle Super-resolution Method for Optimal Antenna Pattern Selection
An optimal antenna and pattern technology, applied in the field of scanning radar angular super-resolution imaging, can solve the problem of reducing and missing high-frequency components
Active Publication Date: 2017-06-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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The out-of-focus image can be regarded as the result of convolution between the object and the point spread function, which often leads to the reduction or absence of high-frequency components in the image
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[0090] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.
[0091] Such as figure 1 As shown, the radar angle super-resolution method selected by the optimal antenna pattern of the present invention adopts such as figure 2 The forward-looking scanning radar imaging movement geometry model is shown, and the scanning radar imaging parameters are as follows: image 3 shown. The target scenarios adopted by this scheme are as follows: Figure 5 shown. Including the following steps:
[0092] Step 1, forward-looking scanning radar azimuth echo modeling; in the step 1, the forward-looking scanning radar azimuth echo modeling process is, because based on the airborne radar, the speed of the carrier aircraft platform is V; the scanning speed of the radar antenna is ω; beam elevation angle is θ; target azimuth angle is The initial slant distance from the target to the radar antenna in the scene is denoted...
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The invention discloses a radar angle super-resolution method for selecting an optimal antenna pattern, which includes forward-looking scanning radar azimuth echo modeling; echo data range-to-pulse compression; distance walking judgment; distance walking correction; scanning radar angle azimuth Convolution model to echo; deconvolution based on optimal antenna pattern selection. The last step includes formula derivation; setting the threshold to control the truncation position; changing the number of points Ncha to control the width to obtain the antenna pattern; substituting the antenna pattern into the derived formula for convolution inversion to obtain the inversion result map; calculating the image entropy to determine Antenna pattern; calculated to give final result. Beneficial effects of the present invention: firstly, the influence of the antenna pattern error on the convolution inversion result is analyzed from an algebraic point of view, then the optimal antenna pattern is determined based on the method of image entropy, and the optimal antenna pattern is combined In the deconvolution method proposed by the invention, the solution of the convolution inversion problem is realized, and the scanning radar angle super-resolution imaging is realized.
Description
technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to scanning radar angle super-resolution imaging. Background technique [0002] As an important means of information acquisition, radar imaging technology is playing an increasingly important role in many fields such as military and civilian. In particular, the radar imaging directly in front of the aircraft has urgent application requirements in the fields of fighter planes' ground reconnaissance and attack, blind landing navigation, and missile precision terminal guidance. [0003] Real-beam scanning radar can achieve range-up super-resolution by transmitting a chirp signal with a large time-width-bandwidth product, but the azimuth resolution is limited by the wavelength and antenna aperture parameters. The angular resolution of the scanning radar antenna is where λ is the radar wavelength and D is the size of the antenna aperture. Therefore, the most direct wa...
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IPC IPC(8): G01S7/41G01S13/89G01S13/28
CPCG01S7/41G01S13/282G01S13/89
Inventor 黄钰林王月周小军任建宇张永超杨建宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA