A kind of interference processing technology of airborne non-vertical dual-antenna interferometric SAR system

A dual-antenna, non-vertical technology, used in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the problems of backwardness, no spaceborne interferometric SAR system, etc., to achieve the effect of promoting development

Active Publication Date: 2011-12-07
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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The second is system development. China has always lagged behind foreign countries in the development of space-

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  • A kind of interference processing technology of airborne non-vertical dual-antenna interferometric SAR system
  • A kind of interference processing technology of airborne non-vertical dual-antenna interferometric SAR system
  • A kind of interference processing technology of airborne non-vertical dual-antenna interferometric SAR system

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[0049] Hereinafter, the present invention will be further implemented in conjunction with the drawings.

[0050] For airborne dual-antenna interferometric SAR, after a simple translation of the main and auxiliary images, coarse registration accuracy can be achieved. image 3 (a) is the coherence coefficient map of the main and auxiliary images after rough registration. From the figure, we can see that there are many low-coherence areas along the azimuth direction. These areas correspond exactly to the moments when the parameters in the aircraft inertial navigation data change suddenly.

[0051] After coarse registration, the overall deviation of the main and auxiliary images is about 1 pixel, and the local area (mainly at different azimuth times) causes a large registration deviation due to aircraft shake. Therefore, at this time, the registration parameters need to be accurately estimated in the local area. According to the local fine registration algorithm, 16*16 grid points ar...

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Abstract

The invention relates to an interference processing technology of an airborne non-vertical dual-antenna InSAR system. According to the invention, because airborne double antennas also make back-forth displacements besides left-right placements and up-down placements, a plurality of creative algorithms are provided by taken the above-mentioned situations into consideration, so that problems that precise data and inversion of elevation of the InSAR system can be solved. More particularly, the interference processing technology comprises the following parts that: (1), a local refined registration algorithm is provided, so that a problem that a registration accuracy of main and auxiliary images is difficult to reach a sub pixel level of refined registration can be solved, wherein the problem is caused by pre-and post-arrangements of the antennas; besides, noise is substantially reduced and thus quality of an interference pattern is improved; (2), a plat-earth phase and baseline distance algorithm, wherein the plat-earth phase and baseline distance algorithm are estimated on the basis of inertial navigation data and a main/auxiliary antenna three-dimensional dynamic imaging model, so that a problem that the plat-earth phase is difficult to be eliminated is solved and residual errors of the interferometric phase can be reduced, wherein the problem is caused by an attitude change of a carrier aircraft; (3), an elevation calibration model, which taking a residual phase and a baseline error into consideration, is established; and elevation calibration is completed on the basis of ground control points. According to the invention, airborne non-vertical dual-antenna InSAR system is utilized and a terrain mapping demand is met.

Description

technical field [0001] The invention is an interference data processing technology applied to an airborne non-vertical dual-antenna interferometric SAR (Synthetic Aperture Radar) system. This technology is conducive to promoting the development of an airborne interferometric SAR system. Inversion, forest vegetation vertical structure parameter inversion based on full polarization interference, large-scale topographic mapping and other professional applications provide a strong guarantee. Background technique [0002] Interferometric SAR processing retrieves the surface elevation from two SAR images of the same area illuminated by two sensors on parallel orbits. Basic process (as attached figure 1 shown) includes coarse registration, fine registration, flat-terrain phase calculation, coherence map calculation, interferogram calculation and flat-terrain phase, phase filtering, phase unwrapping, phase-to-elevation calculation, and geocoding, etc. [0003] Since the European S...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 吴涛陈曦阮祥伟汪洋陈仁元
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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