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Imaging method for curve synthetic aperture radar

A technology of synthetic aperture radar and imaging method, which is applied to the reflection/re-radiation of radio waves, the use of re-radiation, radio wave measurement systems, etc. , reduced time, increased focus energy effect

Active Publication Date: 2021-07-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Then, the coverage area of ​​the interpolation area on the wavenumber domain distribution will directly affect the data utilization rate of the single frame wavenumber domain

Method used

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  • Imaging method for curve synthetic aperture radar
  • Imaging method for curve synthetic aperture radar
  • Imaging method for curve synthetic aperture radar

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Embodiment Construction

[0046] The present invention will be described in detail below in conjunction with the accompanying drawings and simulation examples to prove the practicability of the present invention.

[0047] Carry out the simulation experiment according to the method of step S1, and the specific setting of the simulation parameters is as follows: adopt the imaging mode of the curved SAR, the distance from the radar to the center of the scene is 5000 meters, and the center carrier frequency of the transmitting signal is 94GHZ;

[0048] figure 2 Map the binary matrix image for the actual wavenumber domain, the data in the white area is 0, and the data in the black area is 1.

[0049] image 3 Map the single-value matrix map for the interpolation area, and the data are all 1.

[0050] Figure 4 In order not to use the interpolation area of ​​this method, since the interpolation area is determined by itself according to the adaptive sub-aperture division method, a lot of points are wasted...

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Abstract

The invention belongs to the technical field of radar imaging, and relates to an imaging method for a curve synthetic aperture radar. According to the method, through matrix mapping of wave number domain distribution and an interpolation region, searching for the maximum data utilization rate is converted into searching for index coordinates enabling overlapped data of two matrixes to be maximum, searching is started from an index mapped by a wave number center according to signal characteristics, then the index coordinates are searched according to the optimal solution of each step, and search paths are greatly reduced. The method relates to wave number domain distribution mapping and optimal path searching, and is relatively simple to implement by a program.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to an imaging method for curved synthetic aperture radar. Background technique [0002] Curved SAR is an extended mode of traditional ideal trajectory SAR, which greatly expands the flight mode of SAR and improves the adaptability of SAR. Generally speaking, the curved synthetic aperture radar adopts BP algorithm and PFA algorithm for imaging processing. Since the calculation amount of BP algorithm is relatively large, the PFA algorithm is used for imaging. This algorithm converts the radar echo signal from the time domain to the wave number domain. Since the trajectory of the curved synthetic aperture radar is an uneven curve, its distribution in the wave number domain is also uneven. The PFA algorithm uses the interpolation method to interpolate the uneven wavenumber domain into a uniform square interpolation area, so the interpolation process will inevitably le...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41G06F17/16
CPCG01S13/9021G01S7/41G06F17/16
Inventor 李晋闵锐皮亦鸣刘兴航杨晓波曹宗杰崔宗勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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