摘要
通过星载GPS接收机直接确定卫星星历是低轨卫星定位的一个重要手段。由于低轨卫星的高机动性和GPS接收机较低的运算速度,导致有时下传星历数据的间隔非常大,要获取连续的卫星轨道数据需要进一步处理。在分析遥感卫星轨道特点的基础上,提出一种新的简化轨道摄动力模型,利用模型实现了轨道外推,并利用最小方差序列匹配对低轨卫星外推数据进行修正。通过仿真验证,该算法在一定时间范围内可以达到较高的精度。
Obtaining the satellite ephemeris by onboard GPS receiver becomes an important means of satellite orbit determination. Because of high maneuverability of LEO satellite and low arithmetic speed of the GPS receiver, the continuous satellite orbit data can be gained by further disposal. On the basis of analyzing characteristics of the low orbit, a kind of reduced perturbation force model was proposed , which can be used to extrapolate the satellite orbit. For higher precision,the extrapolated orbit data was revised by the least square error sequential Matching. Finally, the result of simulation indicates that the algorithm can reach high accuracy within certain time range.
出处
《全球定位系统》
2007年第6期1-4,共4页
Gnss World of China
关键词
星历
简化摄动模型
序列匹配
GPS
Ephemeris
reduced perturbation force model
sequential Matching
GPS
