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泥石流与滑坡的监测通常是通过地质调查,确定应予以避开或重点防护的区域,进行离散的定点检测或观测.这种传统的观测无论在时间与地点的选取上都有极大的局限性,难以对付突发的泥石流地区做出及时与准确的预警.本文提出用空基高频(HF,100～300MHz)雷达窄脉冲探测地表层结构的方案.HF雷达可穿透十米左右的地表层,检测作为泥石流激发因素的地表层含水量变化.本文以粗糙界面与散射体的地表介质层模型,推导了HF雷达脉冲波时域Mueller矩阵解,数值模拟极化脉冲雷达距离程回波强度变化,检测正常时与泥石流预警时雷达距离程回波的差异,在达到一定的差异阈值时,做出泥石流预警.
Debris flow and landslide monitoring is usually carried out through geological surveys to identify areas that should be avoided or key protected, and to carry out discrete fixed point detection or observation. Such traditional observation has great limitations both in time and location , It is difficult to make a timely and accurate warning of sudden debris flow areas.This paper proposes a scheme of narrow pulse ground surface detection using space-based high frequency (HF, 100 ~ 300MHz) radar.HF radar can penetrate the surface of about 10 meters Layer to detect the variation of surface water content as a trigger factor of debris flow.In this paper, the time-domain Mueller matrix solution of HF radar pulse wave is deduced from the surface dielectric model of rough interface and scatterer, and the numerical simulation of distance echo intensity Changes, the detection of normal and debris flow warning radar distance echo difference, to reach a certain threshold of difference, to make debris flow warning.