采用软件锁相环技术提取深空探测器高精度多普勒频率

摘要

高精度多普勒测量值是深空探测器精密测定轨的一项重要数据.传统的多普勒频率测量为双程模式.为满足深空探测器的单程和三程多普勒测量需求,本文提出了一种利用软件锁相环技术在甚长基线干涉测量(VLBI)记录的1或2比特量化探测器测控信标的残留载波信号中获取高精度多普勒数据的方法,介绍了软件锁相环数学模型、参数设计和软件实现.经验证,本软件锁相环方法的计算结果和上海VLBI中心用本地相关的方法得到的参考值在测量精度范围内是一致的.%High-precision Doppler data is important for orbit determination of deep space probes. The traditional mode of Doppler frequency measurement is two-way. To meet the demand of observing deep space probes with one-way or three-way modes, a high-precision Doppler data mining method, called software phase lock loop (SPLL) technology, is presented. From VLBI observations of carrier signal of probes, high-precision Doppler value can be extracted by SPLL technology. The mathematical model, parameter design method and software realization of SPLL are introduced. The Doppler frequency values obtained from SPLL are consistent with those reference values given by local correlating method from Shanghai VLBI center.