电视跟踪系统中目标角偏差获取方法的研究

Study of Target Angle Deviation Method in the TV Tracking System

针对由变焦电位计获取焦距电压的电视摄像机,介绍了三种求取目标角偏差的方法:首先介绍了传统查表法获取目标角偏差系数的方法,并指出了其精度不足之处;然后根据光学成像的原理,推导出了实时测量目标角偏差的计算公式,并指出了其实现的困难性;最后针对固定焦距电压下,目标的角偏差与电视脱靶量成线性关系这一特点,利用伺服系统中的编码器输出的真实高精度角度标定角偏差系数,通过曲线拟合的方法找到了易于实现的角偏差系数公式。利用编码器标定角偏差系数的方法,在长焦距高精度跟踪系统中获得了满意的效果。

In the TV camera system that zoom voltage is obtained by potentiometer, three access methods of deviation angle of the method are introduced. First ,the traditional look-up table method introduced obtaining target coefficient of deviation angle, and pointed out the inadequacies of their accuracy. Then, according to the principle of optical imaging is derived from the goal of real-time measurement formula for calculating the deviation angle, and pointed out the difficulty of its realization ; voltage at the end of a fixed focal length, with the goal of the angular deviation from the target of TV is a linear relation between the characteristics, the use of servo system encoder output of the true perspective of precision calibration coefficient of deviation angle through the curve to find an easy way to achieve the angular deviation coefficients formula. Use angle encoder calibration coefficient of deviation of the long focal length of high-precision tracking system was satisfactory results.