Abstract
This chapter presents different intra-pulse modulated systems. It discusses various phase-modulated single pulses and single, long, frequency-modulated pulses. In random phase-shift modulation, the range resolution—like the modulation bandwidth—is determined by the length of the short constituent pulses. The matched filter in the receiving system cross-correlates the received wave form with the transmitted modulation. In quasi-random frequency step, the combination of the fine Doppler resolution system, looking for changes within the total transmitted pulse length, and the coarse system, looking for changes within the auto-correlation time of the transmitted signal, permits the recognition of all possible Doppler shifts, in integral multiples of cycles per total transmitted-pulse length. The use of multiple linear frequency modulations is an example of the general principle of using multiple overlapping ambiguity functions. With on-off modulation, the Doppler line width is determined by the overall duration of the modulation waveform, and, to a first approximation, the spacing between ambiguous alternative Doppler lines is the reciprocal of the minimum spacing between nonzero elements.
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