Processing Method and Verification of Local Correlation for Spacecraft DOR signals
会议名称：《第三届中国卫星导航学术年会》
会议日期：2012年
学科分类：08[工学] 0825[工学-航空宇航科学与技术]
关 键 词：Differential One-way Ranging local correlation processing,correlation phase, group delay
摘 要：Differential One-way Ranging （DOR） is an interferometry method to obtain high precision delay in deep space exploration. Two stations track the same spacecraft to obtain high precision deep space spacecraft’s angle information. The process of DOR signal local correlation processing shows as follows, the model of DOR local signal is firstly constructed, then this model is used to do local correlation processing with the received spacecraft’s radio signal, to obtain high precision delay. Compared with the traditional DOR method, DOR local correlation processing method can be more effective in low SNR conditions to get correct measurement information. Firstly, prior delay model is calculated by orbit prediction, and the spacecraft’s emission frequency is calculated through effective frequency evaluation method, then the prior delay model and emission frequency are used to construct the DOR local model signal, then correlation phase is extracted by cross-correlation processing, finally, DOR group delay is calculated. This paper introduces the mathematical model of DOR local correlation processing in detail, and especially analyzes the technical difficulty in DOR local correlation processing. Based on the theoretical analysis, the algorithm of DOR local correlation processing is executed, and this method is verified by simulation,with the simulation measurement precision is about 0.1 ns,this verifies the effectiveness of DOR local correlation processing, and provides an effective technology for precise spacecraft orbit measurement.