A 3D Imaging Method for Multiple Transmitter and Multiple Receiver Synthetic Aperture Radar
A synthetic aperture radar, multi-transmit and multi-receive technology, applied in the direction of re-radiation, radio wave reflection/re-radiation, instruments, etc., can solve problems such as defocus, unfavorable parallel processing, position offset, etc., to reduce the amount of calculation, Favorable Effects for Parallel Processing
Active Publication Date: 2022-03-18
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
The distance migration algorithm has the following disadvantages: it needs to calculate the Fourier transform of the measurement data along the scanning direction, so the imaging process can only be started after the measurement data is collected along the scanning direction; it can only be used when the scanning trajectory of the multi-input and multi-receiving array is a straight line Multi-transmitter multi-receiver SAR imaging system, which is only suitable for systems with equivalent antenna aperture as a plane, is not conducive to parallel processing
Approximation-based methods will lead to a decrease in the accuracy of imaging results, such as defocusing and position shifting at some imaging positions, and cannot be used for short-distance precise imaging
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[0021] Below in conjunction with accompanying drawing and the example of the present invention, the present invention will be further described.
[0022] figure 1 It is a flowchart of the method of the present invention. figure 2 It is the geometric relationship diagram when the multi-send and multi-receive array scans along a straight line. O represents the origin of the coordinates, the x-axis represents the azimuth direction, the y-axis represents the distance direction, and the z-axis represents the height direction. The send and receive array is parallel to the x-axis, at a distance of y from the origin 0 scan along the z-axis, and the z-axis coordinate of the multi-send and multi-receive array is h. The coordinates of the transmitting array element are (u, y 0 ,h), the coordinates of the receiving element are (v,y 0 ,h), the coordinates of any point on the target are (x,y,z). Assuming that the transmitted signal is a step frequency signal, the measurement data of ...
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The invention discloses a three-dimensional imaging method for multiple-transmitting and multiple-receiving synthetic aperture radar, comprising the following steps: performing two-dimensional imaging on echo data collected by a multiple-transmitting and multiple-receiving array at each scanning position; The two-dimensional imaging results corresponding to each scanning position are respectively projected into the three-dimensional space; the three-dimensional projection results corresponding to all the scanning positions obtained after processing are added together. The invention can avoid calculating the Fourier transform of the measurement data of the multi-transmit and multi-receive synthetic aperture radar imaging system along the scanning direction, can perform imaging processing while the multi-transmit and multi-receive array scans, and is suitable for the multi-transmit and multi-receive array scanning trajectory as a straight line or a curve ( That is, the multi-transmitting and multi-receiving synthetic aperture radar imaging system with the equivalent antenna aperture is a plane or a curved surface, which reduces the computational complexity and facilitates parallel processing.
Description
technical field [0001] The invention belongs to the field of radar imaging methods, in particular to a three-dimensional imaging method for multi-transmission and multi-reception synthetic aperture radar. Background technique [0002] The multi-transmission and multi-reception synthetic aperture radar uses multi-transmission and multi-reception array scanning to form a two-dimensional equivalent antenna aperture, and uses broadband signals to achieve three-dimensional imaging of the target. The scanning trajectory of the array is uncertain, which can be a straight line or a curve. The surface formed by the scanning of the multi-firing and multi-receiving SAR is the equivalent antenna aperture of the multi-firing and multi-receiving SAR. When the scanning trajectory of the multi-transmission and multi-reception array is a straight line, the equivalent antenna aperture formed is a plane; when the scanning trajectory of the multi-transmission and multi-reception array is circul...
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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9058G01S13/9004
Inventor 周剑雄朱荣强
Owner NAT UNIV OF DEFENSE TECH