Simulation Analysis of the Geometric Positioning Accuracy for MEO- and HEO-SAR Satellites

Author:

Zhao Ruishan1ORCID,Yang Ning1,Zhang Guo2ORCID,Pei Liang1,Dai Jiguang1ORCID,Zhang Bing1

Affiliation:

1. School of Geomatics, Liaoning Technical University, Fuxin 123000, China

2. State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China

Abstract

Due to the long synthetic aperture time, the large squint angle, and the large imaging width of medium Earth orbit (MEO) and high Earth orbit (HEO) SAR satellites, it is difficult to simulate the geometric positioning accuracy of MEO- and HEO-SAR satellites through the SAR image simulation methods. In this paper, one non-zero Doppler simulation method of geometric positioning accuracy was proposed without simulating SAR images. In order to simulate the geometric positioning accuracy under different errors and imaging observation conditions, the virtual simulation geometric model was constructed by the simulated satellite ephemeris and the coordinates of ground control points (GCPs). On this basis, one geometric accuracy simulation method based on mean value compensation was proposed to simulate the geometric positioning accuracy with GCPs. The experimental results showed that the impact of Doppler center frequency error and velocity error of MEO- and HEO-SAR satellites on geometric positioning accuracy is significant compared with the LEO-SAR satellites, and the maximum error they affect can reach about 1597 m. In addition, the geometric positioning accuracies of MEO- and HEO-SAR satellites with GCPs can be achieved to 1~10 m and 7~29 m, respectively.

Funder

National Natural Science Foundation of China

Youth project of Liaoning Provincial Department of Education

Natural Science Foundation of Liaoning Province

Key Laboratory of Land Satellite Remote Sensing Application, Ministry of Natural Resources of the People’s Republic of China

One Hundred Talents Program of the Chinese Academy of Science

project supported the discipline innovation team of Liaoning Technical University

Publisher

MDPI AG

Subject

General Earth and Planetary Sciences

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