Three-dimensional deformation inversion method for navigational satellite interference SAR (Synthetic Aperture Radar)
A navigation satellite, three-dimensional deformation technology, applied in the field of three-dimensional deformation inversion of navigation satellite interferometric SAR
Pending Publication Date: 2022-04-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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[0004] In view of this, the present invention provides a three-dimensional deformation inversion method of navigation satellite interference SAR, which solves the problem of experimental acquisition time and selection of launching satellites, and provides a premise for the acquisition of high-precision deformation
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[0014] The present invention will be described in further detail below.
[0015] A kind of three-dimensional deformation inversion method of navigation satellite interference SAR in this specific embodiment is specifically set as: the navigation satellite interference SAR system adopts the northeast sky coordinate system, the transmitter is Beidou IGSO and MEO satellite, and its pitch angle Defined as the angle with the horizontal plane, upward is positive, azimuth θ is defined as the angle with the east direction, positive counterclockwise, the receiver is stationary, placed at the origin of the system, the receiver has two antennas, respectively Receive echo signal and direct wave signal.
[0016] Step 1. Based on the prior trajectory information, calculate the scene average resolution unit area of the target scene within a heavy orbit cycle;
[0017] Compared with the traditional chirp signal, the transmitted signal of the navigation star system is a CA code, and the pu...
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The invention provides a three-dimensional deformation inversion method of a navigation satellite interference SAR (Synthetic Aperture Radar), which solves the problem of selection of experimental acquisition time and launch satellites. Comprising the following steps: calculating a scene average resolution cell area of a target scene in a heavy rail period based on prior trajectory information; calculating a satellite elevation angle at each moment, and screening out satellites of which the elevation angles are smaller than a set value; according to the scene average resolution unit area and a result screened based on the satellite elevation angle, obtaining a collection time and available satellite combination meeting conditions; according to the obtained collection time meeting the conditions and the available satellite combination, obtaining images of all satellites at the time, and obtaining independent points in the images based on the shapes of the resolution units; for the independent points, obtaining all effective independent point sets in the image by calculating a signal-to-noise ratio and sidelobe interference of adjacent points, and selecting a satellite combination with the most effective independent points and an acquisition moment; and carrying out extreme point selection processing on the SAR image set in sequence, and obtaining an effective independent point set.
Description
technical field [0001] The invention belongs to the technical field of bistatic synthetic aperture radar, and in particular relates to a three-dimensional deformation inversion method of navigation satellite interference SAR. Background technique [0002] Interferometric bistatic synthetic aperture radar based on navigation satellite system (GNSS-InBSAR) is a bistatic SAR system that uses navigation satellites as external radiation sources and arranges receivers on the ground or near the ground to receive echoes from target scenes. It has outstanding advantages such as short time, wide coverage, continuous monitoring in space and time, and low cost. [0003] However, due to the large number of satellites in orbit in the navigation star system, in the three-dimensional deformation detection experiment, there are many options and combinations for launching satellites, and the optimal combination needs to be selected to achieve the best deformation detection results; in additio...
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IPC IPC(8): G01S13/90
CPCG01S13/9023G01S13/9058
Inventor 刘飞峰王战泽吕瑞宏王承昊高检
Owner BEIJING INSTITUTE OF TECHNOLOGYGY