适用于CEI的GEO卫星相时延解算方法及试验

为解决在实际航天任务中利用连线干涉测量(CEI)技术进行高精度GEO卫星定轨以及共位GEO卫星相对定位时面临的载波相位整周模糊度难题，提出了一种基于卫星下行信号的多弧段融合相位模糊度解算方法，它通过相邻多弧段载波相位值和窄带信号群时延值的融合处理可精确获得无模糊载波相时延观测量。对提出的方法进行了性能仿真和实际外场试验验证，结果表明：在20 km基线上，利用北斗GEO卫星的伪码测距信号和天链卫星的测控信号均成功实现了S频段解载波整周相位模糊，相时延测量精度优于0.1ns，对应GEO卫星定轨精度优于54 m。该方法在国内首次实现了在几十km基线量级上利用几百kHz窄带测控信号获得无模糊载波相时延，具有较好的工程应用前景。

Method and Experiment of GEO Satellite Carrier Phase Delay Resolution for CEI System

In order to solve the problem of carrier phase ambiguity and get high precision orbital determination result of GEO satellites and relative positioning of co located GEO satellites in real space missions using connected element interferometry (CEI) technology, a method of solving phase ambiguity of the carrier with the data fusion of multiple passes of downlink signal is proposed. Through adjacent multiple passes of carrier phase delay smoothing narrow band TT&C signal group delay, the unwrapped phase delay observations are obtained. The performance simulation and actual test are performed to verify the proposed method. The results show that on the 20 km baseline, both the pseudo code ranging signal of Beidou GEO satellite and the TT&C signal of Tianlian satellite have successfully realized the resolution of phase ambiguity of the S band carrier, and the phase delay measurement accuracy can reach 0.1ns, corresponding to the GEO satellite orbit determination precision better than 54 m. This method achieves the unwrapped phase delay for the first time in China by just using hundreds of kiloherts narrowband measurement with a baseline of tens of kilometers, and has a good application prospect.