On-orbit calibration method and system for SAR beam pointing consistency of distributed InSAR satellite

Abstract

The invention provides an on-orbit calibration method and system for SAR beam pointing consistency of a distributed InSAR satellite. The method and the system are suitable for calibrating and maintaining the SAR beam pointing consistency of the distributed InSAR satellite under a double-satellite (one-transmitting-double-receiving) system or a multi-satellite (one-transmitting-multiple-receiving)system, the testing methods, steps and basic principles of the two systems are the same, and the method is expressed only by taking the double-satellite (one-transmitting-double-receiving) system as an example. The implementation of the method disclosed by the invention can be divided into two parts, namely ''rough adjustment'' and ''fine control''. The method can be used for a design of a distributed InSAR double-satellite SAR system, and can solve problems that the double-satellite SAR beam pointing of a distributed InSAR satellite in on-orbit operation are not consistent, a double-satelliteSAR temperature environment is not consistent because of the inconsistent double-star receiving and transmitting states in an imaging process, the double-satellite SAR beam pointing is deviated, receiving energy of auxiliary satellites is reduced, coherence of double satellites becomes poor, and the surveying and mapping precision is affected.

Description

Technical field[0001]The present invention relates to the technical field of aerospace systems, in particular to an on-orbit calibration method and system for distributed InSAR satellite SAR beam pointing consistency.Background technique[0002]Interferometric Synthetic Aperture Radar (InSAR) is an important remote sensing method for obtaining high-precision ground elevation models (DEM). It uses two SAR antennas distributed along the vertical direction to observe the same area from different perspectives, and performs interference processing on the two acquired complex SAR images to obtain the slant distance difference between the phase center of the primary and secondary radar antennas and the target. Obtain the DEM of the observation area. The distributed satellite InSAR system installs two SARs on two satellites flying in formation to observe the earth simultaneously. It can overcome the problems of time decoherence and low baseline accuracy faced by repeated flights of InSAR, and...

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Problems solved by technology

The main difference: this patent mainly solves the on-orbit calibration and maintenance method of the distributed InSAR satellite SAR beam pointing consistency, and this paper mainly proposes the space synchronization realization method of the beam pointing of the satellite and the aircraft transceiver platform, the application direction, the scope of application, and the technology Significant differences in the way

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