VLBI观测北斗GEO卫星的相关处理试验  

Correlation processing experiment of VLBI BeiDou geostationary satellite observation

作　　者：张继荣[1] 李辉[1] 弓剑军[2] 杨旭海[2] ZHANG Ji-rong;LI Hui;GONG Jian-jun;YANG Xu-hai(Xi’an University of Posts&Telecommunications,Xi’an 710121,China;National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China)

机构地区：[1]西安邮电大学,西安710121 [2]中国科学院国家授时中心,西安710600

出　　处：《时间频率学报》2020年第3期231-239,共9页Journal of Time and Frequency

摘　　要：对北斗地球同步卫星(GEO)使用甚长基线干涉测量技术(VLBI)进行测量,VLBI测量的是目标横向位置与速度,从而与测距测速技术形成互补。研究了VLBI观测卫星的基本原理和DiFX(distributed FX correlator)对卫星处理主要流程。利用适合于卫星的DiFX软件相关器进行数据处理分析获得了清晰的干涉条纹。针对中国科学院国家授时中心宽带VLBI系统在观测北斗卫星信号时,由于观测带宽远大于信号带宽,导致必须要处理大量的无用信息,提出了用Zoom方法对观测带宽频率进行截取有效信号的方法。利用Zoom方法和常规方法进行相关处理及后处理,结果表明在观测有效带宽的情况下,Zoom方法可以有效地提高信号观测质量和观测精度。The Beidou geostationary earth orbit(GEO)is measured using very long baseline interferometry(VLBI).The VLBI observables are sensitive to the lateral position and velocity of the target,thus can be a complement to the range and speed measurement technology.The basic principle of the VLBI satellite tracking and the correlation processes of DiFX(distributed FX correlator)are investigated.Using the DiFX software correlator,clear interference fringes were obtained.As the observation bandwidth is much larger than the signal bandwidth of satellite signals,a large amount of useless information have to be processed in correlator.In this paper,we propose an approach that interceptsing satellite signals within the observation bandwidth frequency by the Zoom method.We correlate the satellite signals with both the Zoom method and the conventional DiFX method,and find the zoom method can effectively improve the quality of the satellite signals and increase the accuracy of satellite observable,group delay.

关 键 词：分布式FX相关机 干涉测量 地球同步轨道 

分 类 号：P127.1[天文地球—天体测量] P228.6[天文地球—天文学]