为了抑制车辆颠簸、倾角变化对传统激光多普勒测速仪的影响, 设计了基于Janus配置的分光再利用结构激光多普勒测速仪, 该测速仪由两个激光多普勒测速仪子系统镜像安装而成, 可补偿倾角变化对速度测量的影响, 因此对倾角变化不敏感.车载实验结果表明该测速仪的测速相对误差为0.3%, 在55.6 km的行程中组合导航的最大位置误差为5.8 m.该结构激光多普勒测速仪能够抑制车辆颠簸、倾角变化对速度测量的影响, 提高组合导航定位精度, 更适合陆用组合导航.

To suppress the influence of the vehicle jolts and the inclination variations on conventional laser Doppler velocimeters, a split-reuse laser Doppler velocimeter based on Janus configuration is designed. The velocimeter is composed of two velocimeter subsystems which are mirror-mounted and insensitive to the inclination variations by compensating the influence of the inclination variations on the velocity measurement. The vehicle experiment results show that the relative error of the velocimeter is 0.3% and the maximum position error of its integrated navigation is 5.8 m in a 55.6 km journey. The proposed laser Doppler velocimeter can effectively suppress the influence of the vehicle jolts and the inclination variations on velocity measurement and improve the positioning accuracy of integrated navigation systems, so it is more suitable for land integrated navigation.