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GEO SAR interference system data acquiring method

An interferometric system and data acquisition technology, applied in the field of synthetic aperture radar

Active Publication Date: 2015-12-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] In view of this, the present invention provides a GEOSAR interferometric system data acquisition method, which can determine the optimal spatial geometric relationship of the GEOSAR interferometric pair based on the minimum rotation decorrelation criterion for GEOSAR interferometric data acquisition, and solve the problem of traditional zero-Doppler center-based low Heavy-orbit GEOSAR interferometric data pairs generated under the orbital SAR interferometric data acquisition method contain obvious rotation decorrelation problems, which greatly improves the correlation of acquired interferometric pairs

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[0073] In this example, the relevant parameters of the heavy-track GEOSAR interferometric system are as follows:

[0074] Table 1

[0075]

[0076]

[0077] We use the set related parameters to obtain GEOSAR interferometric data through a GEOSAR interferometric system data acquisition method in this paper.

[0078] In this paper, the curved '8' GEOSAR orbit is used for simulation, the Back-projection algorithm (BPA) is used for imaging, and the simulated signal-to-noise ratio (SNR) is 10dB. We choose the perigee, which is one of the most serious non-parallel positions of heavy orbit interference trajectories, for simulation verification.

[0079] The following is an analysis of the decorrelation of the interference pair data based on the zero-Doppler center data acquisition method and the minimum rotation decorrelation data acquisition method. Figure 4 shows the correlation coefficient diagram of the interference data obtained under the two data acquisition methods, an...

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Abstract

The invention provides a GEO SAR interference system data acquiring method. According to the method, a rotation decorrelation coefficient is utilized for eliminating deltaKx<^> having no contribution to height measurement, wherein the deltaKx<^> is spatial spectrum shift of range direction in a ground projection direction during first track operation of a GEO SAR system; rotation decorrelation is reduced to improve correlation. Rotation decorrelation is minimized, the deltaKx<^> is minimized through minimizing gamma r, so the spatial spectrum superposition portion of orientation direction in the ground projection direction reaches the largest. Through the method, a problem that GEO SAR interference data generated through a low track SAR interference data acquisition method based on a zero Doppler center in the prior art contains obvious rotation decorrelation is solved.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar, in particular to a data acquisition method of a GEOSAR interference system. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-time high-resolution microwave remote sensing imaging radar that can be installed on aircraft, GEOSAR, missiles and other flying platforms. Since its invention in the 1950s, it has been widely used in many fields, such as disaster control, vegetation analysis, microwave remote sensing and other fields. Geosynchronous Orbit Synthetic Aperture Radar (GEOSAR) is a SAR operating on a geosynchronous elliptical orbit at a height of 36000km. Compared with low-orbit SAR (LEOSAR, the orbital altitude is lower than 1000Km), GEOSAR has the characteristics of large imaging range, short revisit time, strong anti-strike and anti-destruction capabilities, and has become a research hotspot at home and abroad. Interference processing is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9023
Inventor 胡程龙腾李元昊董锡超曾涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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