Abstract
This chapter discusses the basic theory of the linear frequency-modulated (FM) chirp SAW filters, with application to pulse compression radar. The SAW linear FM chirp filter was originally developed for pulse-compression radar. This radar configuration requires two chirp processors. One is in the transmitter for pulse expansion, while the other is in the receiver circuitry for correlation and pulse compression. In operation, a repetitive pulse of non-constant carrier frequency is emitted over a period of many microseconds. If the frequency variation is constrained to change linearly over the pulse duration, then this chirped signal is termed as linear FM chirp one. It is further designated as an up-chirp or a down-chirp one depending on whether the carrier frequency increases or decreases over the pulse interval. The energy transmitted in each chirp pulse will be dictated by the carrier amplitude and pulse duration. The chapter also describes the specifications and operation of the slanted array compressor and the reflective array compressor.
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