基于零基线的DBBC检验

Research of DBBC Test Method Based on Zero-Baseline

比较设备非线性时延校正前后的DBBC设备时延一致性。设计零基线干涉测量试验,对VLBI系统中DBBC设备的时延一致性进行了测量试验;针对设备时延的非线性,利用PCAL信号对DBBC设备进行标校;用MATLAB处理软件对试验数据进行处理和分析。试验结果表明:零基线干涉测量相关处理算法有效;经过PCAL信号非线性时延标校的DBBC设备群时延准确性相对设计指标高了一个数量级。

We compared delay consistency of DBBCs before and after correction. To measure the relative delay consistency of DBBC in VLBI system,zero-baseline interferometry test method was designed and conducted. Using PCAL signal, we calibrated the DBBC equipment for the nonlinear delay of the equipment. Results of experience shows that zero-baseline interferometry correlation processing algorithm is correct,and accuracy of group delay is an order magnitude higher to the specifications of DBBC after that the nonlinear delay is calibrated by PCAL signal.