光栅扫描雷达显示中的余辉模拟

在光栅扫描雷达显示系统中，模拟随机扫描雷达显示系统中的余辉效应是新式雷达尚待解决的一个重要问题。本文讨论了新型的光栅扫描体制的雷达显示系统以及怎样实现余辉效应的方法。以伪随机序列为理论基础，用移位寄存器构成一个随机地址发生器，用高速只读存储器ＰＲＯＭ查询数据，对视频存储器ＶＲＡＭ进行读改写过程，使视频数据递减，以达到模拟随机扫描雷达的余辉效应，起到了良好的仿真效果。

Afterglow Simulation of the Raster Scanning Radar Indication System

In the raster scanning radar display system,the simulation of afterglow effect in the random scanning radar display system is an important unsolved problem in up-to-date radars.This article introduces a new type of radar display system in raster scanning mechanism as well as the method to realise ofterglow effect. Based on the theory of Pseudo-random sequence,the simulation of afterglow effect in the random scanning radar is accomplished and a perfect simulation effect will therefore be achieved by means of using a shift memory to create a random address generator,using a high-speed readonly memory(PROM) to trace data,and perform the reading,revising and writing process on video memory(VRAM) so as to decrease the video data progressively.