论文部分内容阅读
为了提高激光多普勒测速仪的测量精度,研究了多普勒信号渡越加宽的问题。在对多普勒电流进行傅里叶变换的基础上,推导了渡越加宽的计算公式,分析了其产生的主要原因,并讨论了其对测量精度的影响。指出渡越加宽与载体运动速度、载体运动方向与光入射方向的夹角以及信号光在地面上的光斑半径有关。理论分析和仿真结果表明,降低速度、减小发射角及增大光斑半径都会减小渡越加宽;当光斑半径为1 mm,载体运动方向与光出射方向的夹角小于30°时,渡越加宽引起的测量误差小于0.01%。
In order to improve the measurement accuracy of laser Doppler velocimeter, the problem of widening of Doppler signal is studied. Based on the Fourier transform of Doppler current, the calculation formula of transition widening is deduced, the main reason for its occurrence is analyzed, and its influence on measurement accuracy is discussed. It is pointed out that the crossing broadening and the speed of carrier movement, the angle between the direction of carrier movement and the direction of light incident, and the spot radius of signal light on the ground. Theoretical analysis and simulation results show that when the radius of the spot is 1 mm and the angle between the moving direction of the carrier and the direction of light exit is less than 30 °, the crossing will be reduced when the speed is reduced, the angle of emission is reduced and the radius of the spot is increased. The wider measurement error caused by less than 0.01%.