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为了可以同时测量车辆的纵向和横向速度,提出了一种基于Janus配置的三光束激光多普勒测速仪(TLDV)。给出了TLDV的测速模型和测速公式,对其测速的相对误差进行了理论分析和数值仿真。结果表明:TLDV对车辆颠簸、摇晃不敏感,测速误差只受上下颠簸角的影响,与左右摇晃角无关;当车辆上下起伏速度一定时,测速误差随着上下颠簸角的增大而增大,当上下起伏速度为0.2m/s,颠簸角为10°时,测速误差小于0.3%。最后,给出了一种TLDV光束方向的最佳配置方案。
In order to measure the longitudinal and lateral velocities of vehicles simultaneously, a three-beam laser Doppler velocimetry (TLDV) based on Janus configuration was proposed. The velocity model and velocity formula of TLDV are given, and the theoretical analysis and numerical simulation of relative velocity error of TLDV are given. The results show that TLDV is not sensitive to vehicle bump and rocking, and the error of the speed is only affected by the upper and lower bumpy angles, which has nothing to do with the left and right roll angle. When the vehicle fluctuates at a certain speed, the error of speed increases with the increase of up and down bump angle, When the ups and downs speed is 0.2m / s, bump angle is 10 °, the speed error is less than 0.3%. Finally, an optimal configuration of the TLDV beam direction is given.