非均匀散射背景下的列车测速信号建模仿真

由于多普勒效应，高频连续波雷达在列车与地面发生相对运动时会产生相应的频移，利用此频移可以精确地求解出列车速度。由于天线具有方向性，雷达在照射到地面时不会以点目标进行反射，而是以整个反射面的回波进入雷达信号处理系统中，且不同的反射介质会使反射波存在功率方面的差异，因此需要建立相关的数学模型。提出了一种在非均匀散射背景下列车测速信号的多普勒模型，建立了完整的测速数学模型，分析了不同散射界面的散射系数，通过仿真证明了模型的合理性与有效性。

Modeling and Simulation of Train Speed Measurement Signal under Inhomogeneous Scattering Background

Due to Doppler effect ,the high frequency continuous wave radar will generate frequency shift when the train moves to ground relatively ,and the train velocity can be calculated through the frequency shift accurately .Because the antenna has directivity ,when the radar signals irradiate the ground ,they will not be reflected in the form of dot signal ,but will be reflected in the form of the w hole surface to the radar signal processing system ,and different reflecting medium can also lead to power difference of reflected signals .So it is necessary to build correlative mathematic model .This paper brings forward a Doppler model of train speed measurement signal under inhomogeneous scattering background ,constructs w hole speed measurement mathematic model ,analyzes the scat‐tering coefficient of different scattering interfaces ,proves the rationality and validity of the model through simulation .