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中继卫星对用户航天器具有测距功能,中继卫星前/返向SSA(S频段单址)转发器时延引入的距离零值对用户航天器测距数据系统误差的贡献不容忽视。针对中继卫星SSA转发器距离零值不易直接测量的问题,给出了一种标定距离零值的O-C试验方法,并根据连续多天实测的中继卫星多站测距数据和中继卫星对固定模拟测试站四程测距数据标定了2颗中继卫星S频段单址转发器的距离零值,验证了试验方法的有效性。标定结果进一步分离了中继卫星对用户航天器四程测距数据的系统误差,对提高用户航天器定轨精度具有积极意义。
Relay satellites have ranging functions for user spacecraft. The contribution of distance zero values introduced by relay satellite forward / backward SSA (S-band single-site) repeater delay to systematic errors in ranging data of user spacecraft can not be ignored. Aiming at the problem that the relay satellite SSA transponder is not easily measured directly from zero, an OC test method for calibrating the distance zero is given. According to the multi-station ranging data measured by the relay for many days continuously and the relay satellite pairs The four-range distance measurement data of the fixed simulation test station calibrated the zero distance value of the S-band single-site transponder of two relay satellites, which verified the validity of the test method. The calibration result further separates the systematic errors of the relay satellite from the spacecraft’s four-range ranging data and has positive significance for improving the orbit accuracy of the user’s spacecraft.