摘要
论述了基于低轨卫星星载GPS双频观测值的精密单点定位技术的简化动力学定轨方法的数学模型,分析了简化动力学定轨中的关键问题——伪随机脉冲的设置问题及其对定轨精度的影响。最后结合CHAM P卫星实测GPS数据,利用简化的动力学定轨方法对CHAM P进行定轨。算例结果表明,伪随机脉冲的设置可以有效吸收力学模型误差的影响,因而定轨精度较稳定。根据一个星期的CHAM P星载GPS跟踪数据计算的CHAM P轨道,同德国慕尼黑工业大学TUM计算的CHAM P轨道相比,均方根误差(RM S)在10 cm以内。
The principle and the mathematical model of reduced-dynamic precise orbit determination （POD） are discussed based on precise point positioning （PPP） technique by zero-differenced dual-frequency P codes and epoch-wise differenced carrier-phase data. Then the key issue in the reduced-dynamic POD, i.e. the pseudo stochastic pulses and their impact on orbit determination accuracy are analyzed. Finally, real CHAMP GPS data are utilized to demonstrate the accuracy by the reduced-dynamic POD. The results show that the accuracy of reduced-dynamic POD is relatively high and the orbiting results are comparatively stable by using pseudo-stochastic pulses. Compared with CHAMP orbiting results of TUM solutions, the CHAMP orbiting results of one week in 2003 by using reduced dynamic POD method show that the RMS is within 10 cm.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2007年第2期149-153,共5页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家自然科学基金(40474001)资助项目
中国科学院动力大地测量学重点实验室开放基金(L06-05)资助项目
山东理工大学科研基金(2006KJM08)资助项目
关键词
星载GPS
低轨卫星定轨
简化的动力学方法
伪随机脉冲
onboard GPS
orbit determination of low-earth-orbiters
reduced-dynamic method
pseudo stochastic pulse
