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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。
Compare the delay consistency of DBBC equipment before and after nonlinear delay correction. Design zero-baseline interference measurement test to measure the delay consistency of DBBC equipment in VLBI system. For the non-linearity of equipment delay, use DBAL signal to calibrate the DBBC equipment; use MATLAB software to process the test data And analysis. The experimental results show that the algorithm of zero-baseline interference measurement is effective. The accuracy of DBBC device group delay is one order of magnitude higher than that of the design criterion of nonlinear time delay calibration of PCAL signal.