摘要
相关处理是甚长基线干涉测量(very long baseline interferometry,VLBI)技术中信号处理过程的核心,地球静止轨道卫星与射电源信号的相关处理有很大不同。介绍了VLBI信号相关处理的流程、实验系统组成及卫星观测与射电源观测在实施过程中的区别。搭建了一套由天线系统和信号处理系统组成的VLBI观测系统。对中星12号卫星进行了试观测,基于DiFX(distributed FX-style software correlator)软件对采集信号进行自相关处理。数据处理结果表明该VLBI数据接收系统和信号采集系统是正确的,具有一定的实用价值。
The correlation processing is the core technique in the VLBI(very-long-baseline interferometry) signal processing, and the correlation processing for geostationary orbit satellite signal is greatly different from that for radio sources. The correlation processing of VLBI signal, the experimental system composition, and the differences between geostationary orbit satellites and radio sources in observation and processing were introduced. A VLBI observation system, which consists of an antenna system and a signal processing system, were composed. The satellite of China-sat-12 was observed experimentally and the auto-correlation processing for the collected data of the satellite signal was conducted with DiFX software. The signal processing results show that the data receiving system and signal collecting system in the VLBI observation system are right and are of value to some practical works.
出处
《时间频率学报》
CSCD
2015年第3期171-176,共6页
Journal of Time and Frequency
基金
国家自然科学基金资助项目(11173026)
