By Robert C. Stern
London released glossy Conflicts - Air
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TuUy IA INTRODUCTION Although the study of radar cross section and its reduction are interesting from a purely academic point of view, we assume that the reader has a practical application in mind. That application is typically the prediction of a radar's performance against a given target, and then modification of the target RCS to reduce the performance of the radar. The purpose of this chapter is to provide a brief survey of radar fundamentals that can be used to put the RCS and RCS reduction (RCSR) problems in context.
The target scatterers at the center of rotation will have zero doppler, but scatterers away from the center of rotation will have a doppler that is dependent on the rotation rate and their distance from the center of rotation projected into the plane of the incident radar wave. If a series of pulses is collected as the target is rotating and an FFT is applied to the group of pulses, the result will be a cross-range map of the return from the target. 12) where A6 is the total rotation angle over which the data are collected.
In addition, a tracking error signal is often desired for input into tracking control loops. A simple method of obtaining the direction of a target in one dimension, relative to some reference, is to switch the beam position symmetrically to either side of the reference and to measure the amplitude of the target return in each position. Such a technique is called sequential lobing, and the target is centered when the outputs at the two positions are equal. The technique can be extended to two dimensions by using two sets of beam positions orthogonal to one another.