摘要
以中国深空网干涉测量信号处理中心建设为背景,论述了VLBI软相关处理系统的设计及初步实现。依据数据处理流程对软件模块化划分,一方面采用时间并行处理策略,将数据流按子积分周期分配给多个计算节点;一方面在相关计算节点内部应用多线程处理最大化提升效能。依托高性能集群系统,采用两级并行处理策略,实现了软件的设计开发,并在"嫦娥3号"(CE-3)任务中得到了首次应用。与事后精密轨道的比对分析表明,?DOR测量精度在1 ns量级,相当于90 nrad的角位置精度,等价于地月距离上37 m的位置误差。深空干涉测量信号处理中心VLBI软相关处理器有效支撑了CE-3的精密轨道测定。
This paper presents the correlator software system in the interferometric center of China Deep Space Network and its first implementation performance in China CE-3 project. The correlator is designed to run in clusters combined with high performance computers. Based on time parallel strategy and multi-threads processing, the parallel processing algorithm is analyzed. The performance of the correlator software in China CE-3 project is discussed. Compared with high accuracy orbit ephemeris, the observable error in ADOR measurement of the correlator software is on the scale of lns, which corresponds to an angular accuracy of about 90nrad or 37 m＇s uncertainty on the probe position at 380 000 kin. The interferometric tracking center has played an important role in CE-3 navigation.
基金
国家自然科学基金(61401014)
重点实验室基金(9120C990207140C99397)
