FX型相关处理方案及野值剔除算法

FX Correlation Scheme and Improvement on Delete Algorithm

分析了甚长基线干涉测量等干涉测量技术中FX型相关处理方案存在的问题,提出了一种新的FX相关处理方案。该方案经过两次整数比特时延补偿将两站接收信号相对时延缩小到1bit内,从而避免了相位卷绕现象的出现,同时省去了原方案中的小数比特时延补偿,接着对新方案的计算量和相关长度做了深入的分析;改进了一种野值剔除算法,使剔除过程不受相位随频率变化趋势的影响。蒙特卡洛仿真和"嫦娥二号"实测数据处理结果验证了改进的准确性和有效性。

Based on the analysis of the FX correlation in inter{erometry technology such as VLB1, a novel FX correlation scheme was proposed. The new scheme reduced the time-delay between different station signals to less than one bit by compensating the integer hit time-delay twice, which avoided phase wrapping and omitted fraction compensation. Then, analysis on the new scheme was made, including correlation length and computational complexity. In addition, an outlier delete algorithm was mended, which made the delete procedure unaffected by the trend phase change according to the frequency. Monte Caro simulation and CE-2 satellite measured data processing results prove the validity and effectiveness of the improvements.