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Radar Frequencies and Waveforms

Radar Frequencies and Waveforms 12th Annual International Symposium on Advanced Radio Technologies Michael Davis Georgia Tech Research Institute Sensors and Electromagnetic Applications Laboratory Based on material created by Byron M. Keel, , GTRI. Waveforms Extract Target Information A Radar system probes its environment with specially designed Waveforms to identify and characterize targets of interest. Detection For a given range, angle, and/or Doppler, decide if a target is or is not present. Example: Moving target indication (MTI) Radar Estimation For a given range, angle, and/or Doppler, estimate Example: Synthetic aperture Radar (SAR) imaging 2.

Pulse Compression Range response is the auto-correlation of the transmitted signal. To have “narrow” in range (time) domain, the waveform must have “wide” bandwidth in frequency domain The bandwidth of an unmodulated pulse of duration T p is 1/ T p Pulse Compression Use modulated pulses to get better range resolution. 25 2/T p

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Detection and Measurement of Radar Signals: A Tutorial

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FM-pulsed (chirped) Bm ≤ (Bc/t) 1/2, where B c = frequency sweep range during each pulse and t = emitted pulse duration (50% voltage). Example: If radar sweeps (chirps) across frequency range of 1.3 MHz during each pulse, and if the pulse duration is 55 μs, then Bm ≤ 154 kHz. CW Bm = 1 kHz; See sub-paragraph 4.2 of [1, Chapter 5] for RSEC

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