Elementary search radars employ a continuous periodic pulse transmission with a rotating antenna. As the antenna scans across a target, the amplitudes of both transmitted and received pulses are modified by the antenna beam pattern; this converts the uniform periodic pulse train generated by the radar transmitter to an amplitude-modulated pulse train of finite duration. The pulse train duration is determined by the antenna scan rate and beamwidth; the number of pulses in the train is a function of both train duration and the radar pulse repetition frequency. Pulse-train amplitude modulation results in a variation of received pulse signal-to-noise ratio as a function of time. In previous chapters, optimum receiver processing and performance were investigated for uniform pulse trains; these results are extended to amplitude-modulated trains in this chapter.
Weighted Integrators, Page 1 of 2
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