Analysis of orbit determination for inclined geosynchronous SAR using spaceborne GNSS data

doi:10.11947/j.AGCS.2024.20230176

Abstract

Abstract:

With the widespread application of high orbit satellites, the demand for their orbital accuracy is becoming increasingly high. Based on the spaceborne GNSS (global navigation satellite system) data, we simulate an inclined geosynchronous SAR satellite, and analyze the orbit determination accuracy. The results show that the high sensitivity onboard receiver can obtain the signal of about 20 satellites which include GPS and BDS, with PDOP (position dilution of precision) values ranging from 1 to 2. By using the pseudo range/carrier phase measurement values of spaceborne GNSS data, the orbit determination accuracy of inclined geosynchronous SAR satellites can be better than 1 m, and the fluctuation of high-order Legendre error is less than 10 mm. The perturbation of solar radiation pressure has a significant impact on the orbit, the model error of the 10^-8 m·s^-2 order can reduce the orbit determination accuracy by one order of magnitude.

Key words: high-orbit satellite, spaceborne GNSS, IGSO, SAR satellite, precise orbit determination

CLC Number:

P228

Peng YANG, Zhenxing WANG, Xiaobin TIAN, Shigui ZHENG, Yong HUANG. Analysis of orbit determination for inclined geosynchronous SAR using spaceborne GNSS data[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(12): 2305-2315.

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工况	概述
工况1	定点指向巡航成像
工况2	卫星正飞
工况3	卫星正侧视成像

工况	真轨道差异RMS
工况1-工况2	11.94
工况1-工况3	74.37
工况2-工况3	70.49

参数	定轨策略
参考系	地心J2000.0
中心天体	地球
N体摄动	太阳、大行星、地球以及月球，使用DE421历表
太阳辐射压	物理分析型模型
太阳辐射压	经验模型（固定面质比；ECOM）
非球形引力摄动	地球重力场模型JGM3（截取至20阶次）
相对论摄动	参数化后牛顿模型^[32]
解算参数	搭载星载接收机IGSO卫星位置速度
解算参数	模糊度参数
测量数据权重	伪距：1 m
测量数据权重	载波相位：0.01 m/s
积分器	KSG二阶定步长积分器
积分步长	60 s

工况	星座	定轨位置误差/m
工况	星座	R	T	N	total
工况1	GPS	0.136	0.126	0.239	0.303
	BDS	0.253	0.277	0.435	0.575
	GPS+BDS	0.118	0.090	0.227	0.271
工况2	GPS	0.103	0.098	0.227	0.268
	BDS	0.328	0.214	0.373	0.541
	GPS+BDS	0.109	0.086	0.206	0.248
工况3	GPS	1.972	0.965	2.278	3.164
	BDS	0.678	1.056	1.831	2.220
	GPS+BDS	0.315	0.908	1.908	2.136

工况	星座	定轨位置误差/m
工况	星座	R	T	N	total
工况1	GPS	1.346	0.666	0.825	1.714
	BDS	1.262	0.789	0.729	1.657
	GPS+BDS	1.260	0.674	0.680	1.583
工况2	GPS	0.170	0.220	0.222	0.355
	BDS	0.509	0.333	0.522	0.801
	GPS+BDS	0.179	0.214	0.202	0.344
工况3	GPS	2.497	1.555	2.539	3.886
	BDS	1.782	1.183	1.438	2.577
	GPS+BDS	1.827	1.360	2.009	3.037