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针对现有地基山体滑坡雷达实时性差、系统复杂的缺陷,将多输入多输出技术应用到地基山体滑坡雷达,建立基于多输入多输出的地基山体滑坡雷达微小形变探测的数学模型。将多输入多输出天线阵列等效为其对应的虚拟线性阵列,在这个等效线阵的基础上利用后向投影成像算法对雷达回波数据进行成像处理。成像后得到每个像素点的复散射强度,复影像对中对应像素点的复散射强度做复共轭运算,提取出差分相位,由其与微小形变建立数学关系。设置了雷达探测的模拟实验场景参数,依据所建立的模型编写仿真程序。仿真实验表明,雷达系统具有毫米级的理论形变探测能力,系统微小形变探测的相对误差在5%以内,理论模型的正确性得到验证。
Aiming at the defects of poor real-time and complex system of the existing land-based landslide radar, the multi-input and multi-output technique is applied to the landslide radar. The mathematical model of small deformation detection of the land-based mountain landslide radar based on multiple inputs and multiple outputs is established. The multiple input and multiple output antenna array is equivalent to its corresponding virtual linear array. Based on this equivalent linear array, the back-projection imaging algorithm is used to image the radar echo data. After imaging, the complex scattering intensity of each pixel is obtained. The complex scattering intensity of the corresponding pixel in the complex image pair is complex conjugate. The differential phase is extracted and the mathematical relationship is established with the small deformation. Set up the simulation experimental scene parameters of radar detection, according to the established model to write the simulation program. The simulation results show that the radar system has a millimeter-level theoretical deformation detection capability, the relative error of the system micro-deformation detection is within 5%, and the correctness of the theoretical model is verified.