【作者】 李慧； 纪新想； 陆希铁； 高子恒； 王仁龙；

【Author】 Li Hui;Ji Xinxiang;Lu Xitie;Gao Ziheng;Wang Renlong;College of Intelligent Systems Science and Engineering, Harbin Engineering University;Harbin Engineering University Qingdao Ship Science and Technology Co.LTD;

【机构】 哈尔滨工程大学智能科学与工程学院； 哈尔滨工程大学青岛船舶科技有限公司；

【摘要】 作为一种重要的实时轨道产品,北斗超快速预测轨道的精度和稳定性直接影响北斗系统实时服务性能。考虑到北斗卫星运动所处空间环境摄动因素复杂,精化摄动力模型相对困难,本文从研究轨道误差变化规律出发,尝试挖掘超北斗超快速预测轨道误差的先验信息,基于不同机构公开发布的北斗超快速预测轨道产品数据,分别利用傅里叶变换和小波变换对北斗超快速预测轨道误差的全局频域特性及时频变化特性进行了详细分析,结果表明北斗三星座卫星预测轨道误差均存在明显的周期特性,且其显著周期项随时间变化明显,与非地影期相比,卫星预测轨道误差显著周期项在地影期表现出增加趋势,与超快速预测轨道误差变化趋势相同,不同机构产品的周期变化特性表现一致。除此之外,不同厂商制造的北斗卫星其超快速预测轨道误差周期特性表现不同,CAST MEO卫星预测轨道误差表现为一个显著周期项,SECM MEO卫星预测轨道误差表现为两个显著周期项,且在非地影期间SECM MEO卫星显著周期项有明显波动,CAST MEO卫星显著周期项波动相对不明显。更多还原

【Abstract】 As an important real-time orbit product, the accuracy and stability of ultra-rapid predicted orbit affect the real-time service performance of Beidou Satellite Navigation System(BDS) directly. Considering that the perturbations are difficult to be accurately modelled due to the complex space environment that BDS satellites operate in, this paper focuses on the variation of orbit error, trying to find out the prior information in BDS ultra-rapid predicted orbit error. Based on the BDS ultra-rapid predicted orbit products released by different institutions in public, the Fast Fourier Transform(FFT) and Continue Wavelet Transform(CWT)are used for global spectrum analysis and time frequency variation characterization analysis of BDS ultra-rapid predicted orbit error, respectively. The results show that the predicted orbit error of BDS satellites exist obvious periodic terms, and the periodic terms are time-varying. The significant periodic terms in orbit predicted error increase during the earth eclipsing period compared with the normal period, which is the same as ultra-rapid predicted orbit error variation. The periodic characteristics of orbit products from different institutions are consistent. In addition, the ultra-rapid predicted orbit error of satellites made by different manufacturers show different periodic variation performance. For the satellites manufactured by CAST, there is only one significant periodic term, while there are two significant periodic terms for the satellites manufactured by SECM. During the normal period, the significant periodic terms of SECM MEO satellites fluctuate greatly, while not apparent for CAST MEO satellites.更多还原