Pulse-Dopper1 has tended recently to replace pure CW in homing against airborne targets, particularly in AAM and in terminally guided SAM. The reasons for this are: firstly, pulsing the transmitter permits time sharing between transmission and reception, so avoiding difficulties of duplexing and of rear reference spillover; secondly, it provides an extra coordinate for target discrimination — range — which is particularly useful in a high density of targets; and thirdly, illumination in semi-active AAM is compatible with the primary role of the aircraft’s fire direction radar, which is to locate and track targets.
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