MIMO地基雷达微小形变探测建模与仿真

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。

Modeling and simulation of the tiny deformation detection using the ground-based MIMO radar system

In order to solve the problem of existing ground-based landslide monitoring radar being complex system and not real-time processing,multiple input multiple output(MIMO)technology is applied to the ground-based monitoring landslide radar.Mathematical model of detecting tiny deformation using the ground-based MIMO monitoring landslide radar system is established.MIMO antenna array is equivalent to the corresponding virtual linear antenna array,and the radar echo data is imaged by back-projection(BP)algorithm based on the virtual linear antenna array.After imaged,complex scattering intensity of each pixel is obtained,and the complex scattering intensity of corresponding pixels in a pair of image does complex conjugate operation.Differential phase is extracted,and mathematical relationship is established about differential phase and tiny deformation.According to the established model,the main simulation scenario parameters of radar detection is set up,and simulation program is written used for the simulation of the model according to simulation parameters.The correctness of the theoretical model is verified by the simulation with the relative interferometer error being less than 5％;it is found that the radar system has a millimeter-sized deformation detection ability.