双基地雷达实时测距与距离分辨

Real-Time Range Measurement and Range Resolution for Bistatic Radar System

本文叙述了基线长为10km,以接收点为坐标原点的双基地雷达实时测距系统。最大测量距离为25.5km。方位角观察范围为0°至255°,仰角观察范围为0°至40°。测距系统能提供的角度分辨力为1°;能提供显示器的量化距离小于100m。采用十六位微机对目标离接收点的真实斜距进行了精确计算。在整个测距范围内,最大计算绝对误差不超过51m。以 DMA 实现快速数据读出,形成显示器的时基线。在同一波束位置上,本测距系统能处理10~6sec^(-1)数据率的目标,并给出它们的真实斜距。本测距系统计及了目标高度对斜距的影响。整个系统具有数模结合的特点,并保留了目标的幅度信息,为雷达操纵手识别目标提供方便。本文还讨论了双基地雷达的距离分辨力。

Ranging system used in bistatic radar is more complicated than that in monostatic radar because of the separation between transmitter and receiver. Two kinds of ranging systems for bistatie radars have respectively been deve- loped by Hoisington,D.B.(Naval Postgraduate School,Monterey,U.S.A.) and Forrest,J.R.(University College,London,U.K.) years ago.Unfortunately, both above-named ranging systems are unable simultaneously to meet the re- quirements of ranging accurately and quickly yet,and no papers dealing with the problem have been found since then. The paper presents a new ranging system of bistatie radar characterized by its fast and accurate correction.The topics covered are:(i) the geometry of bistatic radar range measurement in consideration of target's altitude,and range resolution relative to azimuth and altitude,(ii) composition of the ranging system and its fundamentals. The new system is designed to work on principle of so called“advance computation/real-time correction”which is the key to very fast operation pro- cess.According to that,the system is constructed in digital circuits as well as analog circuits.Using 16-bit microprocessor as a kernel unit for correction and implementing DMA to pass data corrected to a periphery,the new ranging system restricts the maximum calculation error to 51m or less and makes the correction processor operate in real time on up to about 10~6 target hits per second,which is ten times faster than the system developed early in the eighties.In addition,the amplitude fluctuation information of radar returns, which is very useful for radar operators to identify real targets,still remains when the new ranging system is used.