RGPS在交会对接中的应用

在伪距差分算法中， 目标飞行器的绝对导航误差通过方向余弦影响相对导航精度， 同时由于线性化观测方程引起的模型误差减小， 使其精度随相对距离减小而提高。仿真结果表明位置差分可以用于相对距离大于２００ｍ 阶段， 伪距差分可以用于相对距离２００ｍ 以内阶段， 两种方法的相对速度精度都需要提高。

RGPS for Spacecraft Rendezvous and Docking

It emphasizes on the position and pseudorange differential methods. In pseudoran ge differential method, the accuracy level of least square solution would improv e when the relative range between the target and chaser vehicles becomes less, b ecause the model error due to linearization would become less. The error of abso lute solution would effect the relative solution in the pseudorange differential method, because it brings errors into the direction cosine matrix. The simulati on results show that the position differential method meets the accuracy reqirem ent of \%RVD\% when relative range is more than 200m, and the pseu dorange differential method meets the accuracy rquiement of \%RVD\% when relativ e range is less than 200m, The relative velocity accuracy of both methods need to be improved.