中文摘要：

安装在机车上的多普勒测量雷达，其天线波束方向与地面的实际夹角和理想值之间存在一定的偏差，并且随着机车长时间的振动，夹角也会改变。这给机车速度的测量和行驶距离的推算造成了不可忽视的误差。本文利用双天线多普勒雷达来校正波束偏向引起的误差，提出了平均值方法和角度自适应校正方法。铁路实测数据实验表明这两种方法均不同程度地提高了测量精度，并已在青藏线上的新型机车上验证了性能更好的角度自适应校正方法。

英文摘要：

As to a Doppler speed radar mounted on a locomotive, actual angle included between antenna beam direction and horizontal plane often differs from the ideal one, and the included angle would vary due to vibration of locomotive running in a long periode, which will lead to error in locomotive speed measurement and calculation of traveled distance. By using dual-antenna Doppler radar to correct errors caused by beam direction difference, mean value method and adaptive angle correction method are proposed. Practical experimental results obtained on the train show that speed measurement accuracy are both improved by using of these two methods： and an adaptive angle correction method with better performance has been tested on new locomotives running on the Qinghai-Tibet railway.