TDRS (Tracking and Data Relay Satellite) satellites are provided with the capability of verifying the distance between a TDRS satellite and a user spacecraft.The delay of the forward and return direction SSA (S-band Single Access) transponders of TDRS satellites should not be neglected because of its contribution to the systematic errors.As it is difficult to directly measure the zero-range values of SSA transponders of TDRS satellites,a method for calibration of the delay is proposed.Multiple continuous days of actual multi-station ranging data and four-way ranging data of TDRS satellites with a fixed simulation test station is used in calibration of the zero-range values of the SSA transponders of two TDRS satellites and validation of the effectiveness of the proposed method.The result of calibration is helpful for analysis of the systematic errors and improvement of the orbit determination accuracy for user spacecraft.%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.
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