地基雷达差分干涉形变监测的精度仿真与验证

Accuracy Simulation and Verification of Ground-Based RadarD ifferential Interference Deformation Monitoring

地基差分干涉雷达具有全天候、快速、高精度等优点,近年来逐渐成为形变监测领域广泛关注的新技术。但由于目前雷达的分辨单元远大于观测目标的形变量,无法精确获取目标位置的真实相位信息。针对以上问题,从信号建模角度出发,对标实际的地基雷达形变监测系统,进行了包括信号混频、插值处理到IQ解调在内的全流程Matlab仿真。并通过实测验证,以15×15cm大小的三角形角反射器作为观测目标,证明了上述算法能够实现高精度的雷达差分干涉形变测量,验证了地基雷达系统的亚毫米测量精度。

Ground-based differential interferometric radar has the advantages of all-weather,fast and high preci-sion.In recent years,it has gradually become a new technology in the field of deformation monitoring.However,be-cause the resolution unit of the radar is much larger than the displacement variable of the observed target,the real phase information of the target position cannot be obtained accurately.In response to the above issues,from the per-spective of signal modeling,a full process Matlab simulation including signal mixing,interpolation processing,and IQ demodulation,was conducted to benchmark the actual ground-based radar deformation monitoring system..The experimental results show that the above algorithm can realize high-precision radar differential interferometric deform-ation measurement,and verify the sub-millimeter measurement accuracy of ground-based radar system.