Energy inhibiting system for azimuth first fuzzy region echo signal of space-borne synthetic aperture radar (SAR)
A synthetic aperture radar and energy suppression technology, applied in the field of processing systems, can solve problems such as azimuth ambiguity
Inactive Publication Date: 2012-09-19
BEIHANG UNIV
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The azimuth LFM signal is weighted by the azimuth antenna pattern, but the antenna pattern has side lobes and is in a higher frequency band
[0004] "Radar Imaging Technology" published by Harbin Institute of Technology Press and edited by Liu Yongtan in October 1999 pointed out that the Doppler spectrum of synthetic aperture radar is non-band-limited, and the target echo spectrum is repeated at the pulse repetition frequency. Echo signals will fold into the main spectral region, causing azimuth ambiguity
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[0030] The present invention will be further described in detail in conjunction with the accompanying drawings and simulation examples.
[0031] see figure 2As shown, the present invention proposes a spaceborne synthetic aperture radar azimuth to the first ambiguity area echo signal energy suppression system, the energy suppression system runs in the SAR signal processor, and the SAR signal processor includes the echo signal Arrangement module 1, main imaging area spatial positioning module 2, azimuth direction +1 fuzzy area spatial positioning module 3, azimuth direction +1 fuzzy area space discretization module 4, azimuth direction +1 fuzzy area inversion and blur removal module 5, azimuth Space positioning module 6 for direction-1 fuzzy area, spatial discretization module 7 for azimuth-1 fuzzy area, inversion and deblurring module 8 for azimuth-1 fuzzy area, space discretization module 9 for main imaging area and main imaging for azimuth direction Zone processing module 1...
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The invention discloses an energy inhibiting system for an azimuth first fuzzy region echo signal of a space-borne synthetic aperture radar (SAR). The energy inhibiting system runs in an SAR signal processor; and the raw echo of the SAR is processed in the SAR signal processor, the energy of the azimuth first fuzzy region echo signal is eliminated, and a residue signal is imaged, so that a non-fuzzy imaging result is obtained. In the system, the relevance between a first fuzzy region echo signal and raw echo data is utilized, the scattering coefficient of a first azimuth fuzzy region is resolved on the basis of a least square method, and an echo signal rebuilt by using the first fuzzy region scattering coefficient is eliminated from an acquired echo signal, so that a non-fuzzy main echo signal is obtained. As proved by simulation and imaging of a point target and a face target of a typical space-borne SAR parameter, the energy inhibiting system designed in the invention can be suitable for any space-borne SAR system.
Description
technical field [0001] The present invention relates to a processing system for echo signals of synthetic aperture radar, more particularly, it refers to an azimuth ambiguity suppression system for image processing of spaceborne synthetic aperture radar. Background technique [0002] Synthetic Aperture Radar (SAR) system is an active remote sensing device, which actively transmits electromagnetic waves to the target, and uses the echo signal received by the target scattering characteristics for imaging. Spaceborne SAR is a very complex system with many system parameters that are interrelated and restrict each other. In the range direction, the radar transmits a chirp signal, and performs pulse compression on the echo signal to obtain a higher resolution in the range direction; in the azimuth direction, the radar platform of the satellite changes the relative position of the beam and the target during the advancing process, forming Equivalent linear array antenna, thus impro...
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IPC IPC(8): G01S7/41G01S13/90
Inventor 于泽刘敏
Owner BEIHANG UNIV