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RADAR 101
- Transmitter transmits a waveform S(t)
- Waveform
propagates out to target, reflects and
propagates back to receiver.
- Receiver
receives waveform R(t) which is a
delayed, attenuated, and Doppler shifted version of S(t)
- Target
returns can be identified by analysis of
the Cross-Ambiguity Function
(CAF)
- The CAF is a 3D (Time, Frequency, Amplitude)
representation of the cross correlation of the received waveform with
all possible Doppler shifts of the transmitted waveform
- The severe computational processing load
inherent in computation of this CAF has led to the development of
various
niche Radars, including: CW, LFM, NLFM and Pulsed Doppler.
- Each Radar has its strengths and weaknesses,
often trading off Range Resolution, Doppler
Resolution, and Radar Sensitivity to meet specific requirements while
minimizing implementation costs.
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