Frequency Domain Imaging Method and Device for Circumferentially Scanning Ground-Based SAR
A technology of circular scanning and imaging methods, which is applied in the directions of measuring devices, radio wave reflection/re-radiation, instruments, etc., and can solve the problems of low imaging efficiency, large amount of calculation of time-domain imaging methods, and difficulty in realizing fast real-time imaging, etc.
Active Publication Date: 2021-05-25
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Although the time-domain imaging method is suitable for the circular scanning ground-based SAR system and can obtain high-precision imaging results, the time-domain imaging method has a large amount of calculation and low imaging efficiency, and it is difficult to achieve fast real-time imaging.
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[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0033] In order to perform frequency-domain imaging of circular scanning ground-based SAR, improve imaging efficiency while ensuring imaging quality, and realize fast real-time imaging, an embodiment of the present invention provides a frequency-domain imaging method of circular scanning ground-based SAR, such as figure 1 As shown, the method may include:
[0034] Step 101, obtaining the echo signal of the circular scanning ground-based SAR;
[0035] Step 102, performing a range-inverse Fourier transform on the echo signal of the circular scanning ground-based SAR to...
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The invention discloses a frequency-domain imaging method and device for a circular scanning ground-based SAR. The method comprises: performing range inverse Fourier transform on the echo signal of the circular scanning ground-based SAR to obtain a range-compressed time-domain signal; according to preset The first distance sampling interval and geometric corresponding relationship are used to resample the range-compressed time-domain signal; the range-to-Fourier transform and the azimuth-to-Fourier transform are performed to obtain the range-frequency-domain azimuth-frequency domain signal; according to the pre-constructed matched filter The function performs azimuth matching filtering on the distance frequency domain, azimuth and frequency domain signals to obtain the matched filtered signal; performs two-dimensional inverse Fourier transform on the matched filtered signal to obtain the focused image in the polar coordinate system; Interpolation processing is performed on the focused image to obtain the focused image in the Cartesian coordinate system, thereby performing frequency-domain imaging of the circular scanning ground-based SAR. The invention can improve imaging efficiency while ensuring imaging quality, and realize fast real-time imaging.
Description
technical field [0001] The invention relates to the technical field of ground-based SAR three-dimensional imaging, in particular to a frequency-domain imaging method and device for circular scanning ground-based SAR. Background technique [0002] In recent years, Ground-based Synthetic Aperture Radar (GBSAR) has been widely used in landslide monitoring, volcano monitoring, glacier monitoring, open pit monitoring, bridge and building monitoring and other fields. However, the traditional linear track (GBSAR) can only obtain two-dimensional images, and there is a problem of "overlapping" in areas with undulating terrain, which is not suitable for complex terrain, and cannot obtain three-dimensional terrain information of the monitoring scene. [0003] Circumferential scanning ground-based SAR is a new system ground-based SAR with three-dimensional imaging capability. Compared with the traditional linear orbit ground-based SAR, the circular scanning ground-based SAR antenna for...
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IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/9052G01S13/9056
Inventor林赟冯子龙王彦平李洋申文杰
OwnerNORTH CHINA UNIVERSITY OF TECHNOLOGY