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在飞行试验中，采用直接成像的电视跟踪系统对飞行目标进行自动跟踪和测量，不仅观察方便，而且更适合于对视频信号数字化和图像处理。电视系统要执行在作用距离内对飞行目标的搜索、跟踪和测量等功能，单靠一种固定焦距的电视物镜显然是不够的。介绍了一种具有三种成像倍率的变焦距电视物镜，着重描述了其结构组成、技术性能及特点。借助于三种成像倍率的变化，系统得以实现形心跟踪、边缘跟踪和相关跟踪等多种跟踪方式，从而完成地多种成像状态下对飞行目标的自动跟踪和测量，如远距离的点目标，近距离体目标的某部位以及复杂背景中的动目标等。
In the flight test, the direct tracking system of the television is used to automatically track and measure the flight target, which is not only easy to observe, but also more suitable for digitalization and image processing of the video signal. Television Systems To perform functions such as searching, tracking and measuring flight targets over range, it is clearly not enough to rely on a single fixed focal length television objective. A zoom television objective lens with three imaging magnitudes is introduced, and its structure, technical performance and characteristics are mainly described. With the change of three kinds of imaging magnification, the system can realize a variety of tracking methods such as centroid tracking, edge tracking and correlation tracking, so as to accomplish the automatic tracking and measurement of the flight targets in various imaging states, such as long-distance point targets , A part of a close range target, and a moving target in a complex background.