摘要
在分析了几种玫瑰扫描系统中目标方位信息提取方法的基础上 ,提出一种简单有效的方位信息提取方法。这种方法是根据 ,玫瑰扫描系统中两反射镜绕轴转过的角度唯一地决定瞬时视场的位置 ,当目标脉冲到来时记下两反射镜绕轴转过的角度 ,就可以确定此时的目标位置 ,从而找到了确定目标方位信息的关键 ,彻底解决了初相位问题。在两个反射镜上安装光电探测器 ,使之转一周产生一个脉冲信号作为基准信号。用两个计时器 ,分别对应于两个反射镜 ,当基准信号到来时开始计时 ,在任一时刻反射镜转过的归一化角度值 (一周角度为 1)为计时器的当前值与转过一周时计数器值的比值。在目标脉冲到来时 ,记下计时器的值 ,求出转角 ,就可以确定目标位置。文中还对电机转动不稳定性引起的误差进行了分析 ,确定了判别目标阈值的选取。同时 ,采用数字信号处理系统 ,增加了处理的灵活性和精度。给出了实现过程 ,实验结果的分析表明这种方法是可行的。
On the basis of analyzing several methods of getting the target's orientation in rosette scanning system, a simple but effective method is presented in this paper. The basis of the method is that the angles of two reflectors running around the axis determine the position of the instantaneous view field. The angles of two reflectors are noted down when there comes a pulse of target, the target's orientation can be got. So, the key of getting the target's orientation is found and the problem of original phases is thoroughly solved. Fixed photoelectric detectors on the two reflectors, they produce a pulse signal as reference signal every round. Two timers start to work as soon as the reference signals come and note down the value when there is a target. At anytime, the value of the timer divided by the cycle value represents the angle of the reflector(let a round be one). When the pulse of target comes, note down values of timers, calculate the angles then get the target's orientation. In this paper, the error due to the instability of motor is analyzed and the threshold used to identify the target is given. At the same time, a digital signal processing system is used to gain agility and precision. The realization of the method is given. A conclusion can be drawn from the result of the experiment that the method is feasible.
出处
《红外与激光工程》
EI
CSCD
2000年第4期38-41,共4页
Infrared and Laser Engineering
关键词
玫瑰扫描系统
目标方位
信号处理
红外
Rosette scanning system
Target's orientation
Signal processing
