基于加速度计的望远镜平台抖动测量与分析

望远镜系统中产生的抖动会影响跟踪精度，造成成像模糊。为了达到最优的望远镜系统设计，提高定位跟踪精度，必须对系统中的抖动进行评估。根据高灵敏度压电加速度计的测量原理，在车载望远镜平台上搭建了抖动测量系统，测量了望远镜静止和转动过程车载平台产生的抖动加速度。通过数据采集系统采集抖动加速度信号，得到的数字信号经过小波去噪处理后，用功率谱估计来分析抖动频率分布特性。结果表明：望远镜转动过程中，车载平台产生的抖动加速度可达0．015g。，最大抖动信号频率在67Hz左右，同时验证了高灵敏度的压电加速度计用来测量微弱抖动信号的可行性。

Telescope platform jitter measurement and analysis based on accelerometer

Jitter in telescope system will impact tracking precision and blur images. In order to achieve optimal telescope system design,improve precision of location and tracking,jit!er in system must be evaluated. According to measurement principle of high sensitive piezoelectric accelerometer, build up jitter measurement system on vehicle telescope platform, measure jitter acceleration on vehicle platform while the telescope is static and rotating. Jitter acceleration signal are collected by data acquisition system. The digital signal are wavelet denoising, processed and use power spectrum estimation to analyze distribution properties of jitter frequency. The result shows that during rotation of telescope,jitter acceleration generated by vehicle platform is up to 0. 015 gn, maximum jitter signal frequency is about 67Hz, it also verifies that it is feasible to use high sensitive piezoelectric accelerometer to measure slight jitter signal.