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Multichannel spaceborne synthetic aperture radar azimuth spectrum sparse reconstruction method

A synthetic aperture radar, sparse reconstruction technology, applied in the field of signal processing, can solve the problem of high data rate

Active Publication Date: 2012-05-09
BEIHANG UNIV
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Problems solved by technology

[0005] Aiming at the problem of high data rate in the existing multi-channel space-borne synthetic aperture radar technology, the present invention proposes a multi-channel space-borne synthetic aperture radar azimuth spectrum sparse reconstruction method, which uses sparse sampling of the azimuth echo of each channel , realize the azimuth spectrum reconstruction, and verify the accuracy of the method by evaluating the results after the azimuth matched filtering

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  • Multichannel spaceborne synthetic aperture radar azimuth spectrum sparse reconstruction method
  • Multichannel spaceborne synthetic aperture radar azimuth spectrum sparse reconstruction method
  • Multichannel spaceborne synthetic aperture radar azimuth spectrum sparse reconstruction method

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Embodiment

[0101] The simulation parameters of multi-channel SAR are shown in Table 1.

[0102] Table 1 Multi-channel SAR simulation parameters

[0103]

[0104] Carry out the echo simulation according to Table 1, obtain the echo data of three channels, and perform the sparse spectrum reconstruction according to the following steps.

[0105] Step 1: Azimuth and time-domain sparse processing;

[0106] The size of the echo data of the three channels is 1024×4096, the number of pulses in the azimuth direction is 1024, and the number of sampling points in the range direction is 4096. The computer processing with Windows XP operating system (32-bit system) is used to perform azimuth sparse processing on the echo signals of each channel.

[0107] Specifically: for each determined sampling point in the range direction, the range echo signal only affects the amplitude of the azimuth echo, but does not affect the phase of the azimuth echo. Le term gets:

[0108] S ...

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Abstract

The invention discloses a multichannel spaceborne synthetic aperture radar azimuth spectrum sparse reconstruction method, belonging to the technical field of signal processing. The method comprises six steps of azimuth time domain sparse processing, echo signal azimuth frequency domain sparse representation, azimuth time domain sparse sampling, azimuth frequency domain sparse reconstruction, azimuth frequency domain echo phase compensation and azimuth frequency domain filtering reconstruction. With the method, azimuth spectrum reconstruction is realized by sparse sampling of each channel spectrum echo, downloading data rate of multichannel SAR (Spaceborne Synthetic Aperture Radar) is reduced effectively, and data storage and transmission resource is saved; SAR azimuth spectrum reconstruction can be realized accurately by little under rate sampling azimuth pulse data; and the multichannel spaceborne synthetic aperture radar azimuth spectrum sparse reconstruction method provided by the invention improves computational efficiency.

Description

technical field [0001] The invention relates to a multi-channel spaceborne synthetic aperture radar (SAR) sparse reconstruction method for azimuth spectrum based on compressed sensing, which belongs to the technical field of signal processing. Background technique [0002] Synthetic Aperture Radar (SAR) has all-weather and all-weather earth observation capabilities, and is playing an increasingly important role in military and civilian applications. With the continuous improvement of SAR resolution, a larger Doppler bandwidth needs to be formed. For example, increasing the azimuth resolution requires increasing the Doppler bandwidth; according to the Nyquist sampling theorem, the radar pulse repetition frequency must be increased, resulting in a decrease in the observation bandwidth. Under the traditional working system, it is difficult for spaceborne SAR to meet the imaging requirements of high resolution and wide observation band at the same time. The azimuth multi-chann...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/292G01S7/32
Inventor 陈杰高建虎朱燕青
Owner BEIHANG UNIV
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