静地卫星定轨的模糊度及基线选址

在短基线相位干涉法卫星定轨原理的基础上，分析了各主要误差源及其对相位模糊度计算的影响特性，指出目标卫星的初始轨道精度是影响模糊度解的主要因素；讨论了高稳定度的原子钟和共用本振方法以及近角距的较差观测对提高模糊度解的可靠性和精密定轨的积极作用。最后提出了综合有效率的概念，它可作为地面双基线布设及最优选址的参考依据。

Phase Ambiguity and Location of Tracking Sites of Orbit Determination of GEO Satellite

Phase Delay Interferometry on two short rectangular baselines can obtain angular tracking ability of mid-accuracy, compared with VLBI, for geostationary satellites. This paper firstly investigates the error sources of phase delay and their influential characteristics to phase ambiguity (N). Theoretical analysis shows that the priori positional uncertainty of the target satellite is the dominant factor in degrading the reliability of N, which becomes one of the operational challenges for this method. Some active and effective measurements are introduced to ensure both the resolution of N and angular navigational accuracy including high stable atomic clock equipped for each site or a common oscillator with connected elementary interferometry (CEI) as well as differential observables from other angularly close objects with high position accuracy. Finally, the concept of integrated efficiency factor is presented to evaluate the tracking ability of the ground baselines.