第18卷第6期 2010年6月
1004-924X(2010)06-1286-09
文章编号
光学精密工程
Optics and Precision Engineering
Vol.,18No. 6
Jun.2010
利用动态靶标谐波特性评价光电经纬仪的跟踪性能
张宁1,2，沈湘衡1，杨亮12，谢明明1,2
（1.中国科学院长春光学精密机械与物理研究所，吉林长春130033；
2.中国科学院研究生院，北京100039）
摘要：提出了一种利用动态爬标实现光电经纬仪跟踪性能等效正弦评价的新方法，分析了动态靶标目标及相应跟踪误差的幅度谱和功率谱特性，提出将动态靶标看作由有限项基频谐波和整数倍基频高次谱波的加权和组成的谐波源。根据被检光电经纬仪跟踪性能设计等效正弦信号，利用动态靶标产生与等效正弦信号间频率的谐波信号完成光电经纬仪跟踪误差系统在该频率下幅频特性函数值的测试。等效正弦的幅值和测得的幅频特性值乘积即为跟踪等效正弦信号的跟踪误差最大值，从而实现了跟踪性能评价。利用该方法测得方位方向的最大跟踪误差为0.65，远小于4"的指标要求，面利用动态靶标直接检测的值为4.7"。实验表明该方法准确、可行，同时避免了直接利用动态靶标检测时可能使跟踪伺服系统出现过度校正的间题。
关键词：光电经纬仅；跟踪性能；动态靶标；幅度谱；功率谱；傅里叶级数；跟踪误差系统
中图分类号：V556.5
文献标识码：A
doi;10. 3788/OPE. 20101806, 1286
Evaluationoftrackingperformanceofphotoelectrictheodolite
by usingharmonicpropertyofdynamictarget
ZHANG Ningl-,SHEN Xiang-heng',YANG Liangl-2, XIE Ming-ming"
(1.Changchun Institute of Optics,Fine Mechanics and Physics, ChineseAcademy of Sciences,Changchun130033,China;
2.Graduate University of Chinese Academy of Sciences,Beijing 100039,China)
Abstract: A novel approach based on the equivalent sine testing is proposed to evaluate the tracking performance of a photoelectric theodolite by using a dynamic target. The characteristics of the ampli-tude and power spectra of the dynamic target and the relative tracking errors are analyzed,and the dy namic target is taken as a harmonic source formed by the finite weighted sums of the base frequency harmonics and the weight sums of high harmonics that is the integral times of base frequency. The an gular frequency and amplitude of an equivalent sine signal are designed according to the testing desire, and the amplitude-frequency characteristic function value of tracking error system is tested by using the harmonic signal in the same angular frequency with the equivalent sine signal generated by the dy-namic target. The amplitude of equivalent sine and the function value are multiplied to get the maxi-mum tracking error of tracking signal, and then the tracking performance is evaluated by using the
收稿日期：2009-05-25；修订日期：2009-08-26.
基金项目：国家863高技术研究发展计划资助项目（No.2008AA7034320B)