论文部分内容阅读
激光多普勒测速系统可实现空中运动平台的速度测量,平台的姿态测量误差是影响其测速精度的重要因素。为实现运动平台三维速度的测量,以相干探测原理为基础,设计并搭建了全光纤三光束激光多普勒测速系统,建立了运动平台三维速度测量的数学物理模型,对系统测速相对误差进行了数值模拟研究。研究结果表明,姿态测量误差对测速精度的影响不可忽略;随着俯仰角度的不同,俯仰误差与旋转误差对测速精度的影响程度会发生变化;测速精度与旋转误差呈线性关系,而与俯仰误差存在着非线性关系。研究结果可为激光多普勒测速系统的设计以及速度修正提供理论依据。
The laser Doppler velocimetry system can realize the velocity measurement of the aerial platform, and the error of the attitude measurement of the platform is an important factor that affects the precision of the velocity measurement. In order to measure the 3D velocity of the motion platform, an all-fiber three-beam laser Doppler velocimetry system was designed and built based on the coherent detection principle. The mathematical model of the 3D velocity measurement of the motion platform was established. The relative error of the velocimetry Numerical simulation research. The results show that the influence of attitude measurement error on speed accuracy can not be neglected. With the different pitch angle, the influence degree of pitch error and rotation error on speed accuracy will change. The accuracy of velocity measurement is linear with rotation error, There is a non-linear relationship. The results provide a theoretical basis for the design and velocity correction of laser Doppler velocimetry system.