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Sensors 2017, 17(10), 2165; https://doi.org/10.3390/s17102165

ZY3-02 Laser Altimeter Footprint Geolocation Prediction

1
Satellite Surveying and Mapping Application Center, NASG, Beijing 100048, China
2
Key Laboratory of Satellite Surveying and Mapping Technology and Application, NASG, Beijing 100048, China
3
School of Surveying and Geographical Science, Liaoning Technology University, Fuxin 123000, China
4
School of Earth Science and Engineering, Hohai University, Nanjing 211100, China
*
Author to whom correspondence should be addressed.
Received: 17 July 2017 / Revised: 19 September 2017 / Accepted: 19 September 2017 / Published: 21 September 2017
(This article belongs to the Section Physical Sensors)
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Abstract

Successfully launched on 30 May 2016, ZY3-02 is the first Chinese surveying and mapping satellite equipped with a lightweight laser altimeter. Calibration is necessary before the laser altimeter becomes operational. Laser footprint location prediction is the first step in calibration that is based on ground infrared detectors, and it is difficult because the sample frequency of the ZY3-02 laser altimeter is 2 Hz, and the distance between two adjacent laser footprints is about 3.5 km. In this paper, we build an on-orbit rigorous geometric prediction model referenced to the rigorous geometric model of optical remote sensing satellites. The model includes three kinds of data that must be predicted: pointing angle, orbit parameters, and attitude angles. The proposed method is verified by a ZY3-02 laser altimeter on-orbit geometric calibration test. Five laser footprint prediction experiments are conducted based on the model, and the laser footprint prediction accuracy is better than 150 m on the ground. The effectiveness and accuracy of the on-orbit rigorous geometric prediction model are confirmed by the test results. The geolocation is predicted precisely by the proposed method, and this will give a reference to the geolocation prediction of future land laser detectors in other laser altimeter calibration test. View Full-Text
Keywords: ZY3-02 laser altimeter; geometric calibration; footprint location prediction; rigorous geometric prediction model; pointing angle prediction; orbit prediction; attitude prediction ZY3-02 laser altimeter; geometric calibration; footprint location prediction; rigorous geometric prediction model; pointing angle prediction; orbit prediction; attitude prediction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Xie, J.; Tang, X.; Mo, F.; Li, G.; Zhu, G.; Wang, Z.; Fu, X.; Gao, X.; Dou, X. ZY3-02 Laser Altimeter Footprint Geolocation Prediction. Sensors 2017, 17, 2165.

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