Footprint Location Prediction Method of ZY3-02 Altimeter

• Main Authors: TANG Xinming, XIE Junfeng, MO Fan, ZHU Guangbin, DOU Xianhui, ZHANG Qiang, LI Guoyuan, OUYANG Sida
• Format: Article
• Language: zho
• Published: Surveying and Mapping Press 2017-07-01
• Series: Acta Geodaetica et Cartographica Sinica
• Subjects: laser altimeter; laser footprint; rigorous geometric positioning prediction model; pointing prediction; orbit prediction; attitude prediction
• Online Access: http://html.rhhz.net/CHXB/html/2017-7-866.htm

On-orbit geometric calibration is an essential way to improve plane and elevation accuracy of laser altimeter data, and the laser footprint location prediction is a prerequisite for calibration based on land infrared detector. This paper builds a laser footprint location prediction model for China's first space-borne laser altimeter carried by ZY3-02, which refers to the satellite optical camera rigorous geometry imaging model. The model takes full account of the law of platform movement, and correlates laser emission center with ground footprint point. We get the precise predicted laser pointing by Pyramid terrain matching, ephemerisby acceleration prediction, and attitude by frequency analysis. The laser footprint location can be predicted. This laser footprint location prediction model were successfully applied in the calibration test of the laser altimeter on ZY3-02 satellite, and the maximum error between the predicted location and real footprint location obtained by triggered detectors is less than 150 m, which proves the validity of the proposed model. The proposed method provides the precise point-to-point prediction from satellite to ground for Chinese remote sensing satellite, and offers a technological support for the space-borne laser altimeter calibration in future.