深空探测网中的Delta-DOR测量技术

Delta-Differential One-Way Ranging Measurements at the Deep Space Network

介绍了ΔDOR测量技术及其VLBI科学接收机的原理。ΔDOR是一种无线电测量技术,目前广泛用于深空探测,它能提供目标航天器相对于射电源的角位置信息。通过VLBI科学接收机处理ΔDOR信号,信号经过多次下变频、采样、滤波和抽取,输出目标航天器的窄带信号和射电源的宽带信号,对输出信号进行截短、打包和存储。实现了把高频信号转化为基带信号,在很大程度上降低了数据量。最后通过仿真分析了ΔDOR测量技术以及高斯白噪声和截断误差对ΔDOR的影响程度。

This paper describes the theory of Delta-Differential One-Way Ranging technique and the architecture of the VLBI Science Receiver. Delta-DOR is a radio-tracking technique that has been widely used in Deep Space Network. It provides information about the angular location of a target spacecraft relative to quasar whose angular position in the sky is well known. Delta-DOR signals are received by the VLBI Science Receiver. Signals will be down converted, sampled, filtered and decimated in VLBI Science Receiver. Then export the narrowband signals of the target spacecraft and the broadband signals of the quasar. Eventually, the output data is truncated and packed and store in a memory. The High frequency signal being down converted to low frequency signal, it will reduce the data size to great extent. Finally, though simulation, it will prove the validity of Delta-DOR and analyze the effect of the While Gaussian Noise and truncation to Delta-DOR technique.