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同波束VLBI技术是解决月球轨道交会对接地面高精度引导的重要手段.传统的多频点同波束VLBI实时解算算法成功解算差分相位整周模糊度的概率较低,而事后统计修正求解整周模糊度的算法存在较大的时间滞后,从而直接影响月球轨道交会对接两个航天器地面定轨、定位的精度以及实时性.在此背景下,本文研究了应用于月球交会对接条件下的同波束VLBI差分相时延实时解算算法.首先给出了多频点同波束VLBI解算差分相时延及整周模糊度的原理,根据差分相关相位整周模糊和差分相时延实时及事后解算结果,对整周模糊度产生的原因进行分析通过求解精确差分群时延值、采用匹配搜索算法以及差分相位连接条件对传统实时解算算法进行改进,提出一种新的差分相时延实时解算算法.利用SELENE同波束VLBI观测数据进行实时解算,结果表明该算法成功解算模糊度的准确度达到95.49%,相对于传统解算算法准确度提高了5.45%.
The same beam VLBI technology is an important means to solve the high precision guidance of lunar orbit rendezvous and docking ground.The traditional multi-frequency and spot-beam VLBI real-time algorithm has a lower probability of solving the integer phase ambiguity of differential phase successfully, The algorithm of ambiguity degree has a big time lag, which will directly affect the accuracy of the orbit determination and the real-time performance of lunar orbit rendezvous and docking of two spacecraft.In this context, this paper studies the application of lunar rendezvous and docking Time VLBI differential phase delay real-time algorithm.Firstly, the principle of multi-frequency spot VLBI beamforming differential phase delay and integer ambiguity is given.According to the differential correlation phase of the whole week fuzzy and differential phase delay real-time and After solving the results after the analysis of the reasons for the integer ambiguity by solving the exact differential group delay value, the use of matching search algorithm and the differential phase connection conditions of the traditional real-time algorithm to solve the problem, a new differential phase Delay real-time solution algorithm.Using SELBE with beam VLBI observation data for real-time solution, the results show that the algorithm successfully solve the ambiguity accuracy Reaching 95.49%, compared with the traditional solution algorithm accuracy increased 5.45%.