地面雷达在边坡形变观测中的环境影响校正

Environmental Correction for Ground-Based Radar in Monitoring of Slope Deformation

基于地面合成孔径雷达干涉技术的微变形监测系统(IBIS-L)是具有远距离、大范围、连续空间覆盖、实时监测能力的创新雷达.IBIS-L差分干涉测量中,易受大气扰动影响,严重影响测量精度.根据角反射器安置像素点强散射、高质量相位、高相关性的特点,结合泰森多边形分析法则和加权平均算法,提出了用邻近的角反射器安置点来校正观测墩所在像元大气扰动误差的方法.采集IBIS-L系统对水电站边坡为期几个月的连续监测数据进行了误差校正试验,得到了在雷达视线方向优于毫米级精度的形变结果,具有很好的可靠性、实用性和精确性.

Micro deformation monitoring system （IBIS-L）is an innovation radar with long-range,large-scale, continuous spatial coverage and real-time monitoring capabilities.In IBIS-L differential interferometry,atmos-pheric disturbance seriously affects the measurement accuracy.With consideration of the characteristics of corner reflector positioned pixel such as strong scattering,high-quality phase,and high correlation,Thiessen polygon a-nalysis rules and the weighted average algorithm are combined to propose a method in which corner reflector posi-tioned pixels are used to correct the observation pixels.Using continuous monitoring data on the slope of hydro-power stations for experiments,the results show that the accuracy is better than millimeter in radar line of sight direction,with good reliability,practicability and accuracy.