单站观测卫星初轨计算中的初值方法

研究了用单个观测站粗略确定低轨卫星轨道的问题，建立了在时间轴上拓展的测量方程，并着讨论了其中的初值问题；给出了两种基于线性变换的初值方法，并对其性能做了比较，实验结果证明：这些方法能给出一个确定的、实用的初值，大大减少了初轨计算的计算量，并使得算法收敛更加有保障，在工程实用方面比传统的猜测方法具有较大的优势。

Initial Value Method of Orbit Determination Using a Single GPS Satellites

Based on the research of orbit determination using a single GPS satellites,two effective methods of getting initial value and comparison of their performance are discussed.Computer simulation shows the second method can give a fixed and practical initial value.As a result,the amount of calculation is cut down greatly and the converge performance of the algorithm is improved.This technique is superior to the traditional guess method in the engineering field.