模拟研究卫-卫跟踪中星间隔的选择问题

Discussion on Separation Parameter from Satellite to Satellite Tracking Numerical Simulation

从两个方面讨论了低轨卫星在做卫-卫跟踪(SST)观测时,星间隔的选择问 题. 1)用地球重力位系数作为扰动量,比较该扰动引起的不同间隔的SST星间距离和速 度变化大小. 2)用随机误差为1μm／s的星间速度变化作为模拟观测量,恢复不同间隔的 地球重力位系数,并做精度评估.两种结果表明,适当增大SST间隔对求解重力场有利, 但无限制增大无实际意义,对于选定高度为420 km卫星,在作SST观测时,星间隔不宜 超过690km.此模拟方法及结果对我国确定重力卫星指标有着重要意义.

The problem of satellite-to-satellite tracking (SST) separation parameter be discussed in two aspects. First is compared the SST range and range rate variation with different SST separations due to geopotential perturbation. Second is recovered the Earth's gravity field from different SST separations with 1μm/s SST range rate random noise, and discussed the accuracy of the gravity field solution. Results indicated that the accuracy of the gravity field recovery increased when increasing the satellite separation of the two satellites, but unlimited increment was not valid. For the two satellites at about 420km altitude, the best SST separation parameter should not be more than 690km. The simulation method and results may be more significant to select the SST separation parameter for our country's gravity satellite system.