Brett Williams's Reviews > High-Resolution Radar

High-Resolution Radar by Donald R. Wehner
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it was amazing

HRR is well written and fairly complete with references allowing deeper investigations on most topics. The fact that it's cleanly written with a logical flow and natural development sets it apart from most technical volumes—as those of us spending our lives deciphering their mental gymnastics know too well. The author's treatment of pulse compression, which pops up repeatedly in various forms, is complete enough to write code to test waveform behaviors and receiver performance. It might have helped to provide a list of pros and cons here and their throughout the text, rather than note them in the body, but a compete read will find them. The wide bandwidth penalty through the receiver from front to back, or high ADC sample rate requirement for chirp, are noted several times but such design considerations seem to deserve a red flag or blinking lights on the page. Having grasped those shortcomings of chirp the author relieves our worry with time domain sampling—a way to get pulse compression gain without the pain. Instead of a single pulse modulated over 500MHz, we can step say, 10MHz per pulse for 500 pulses and get the same result. The advantage comes from incrementing transmit frequency in sync with the LO, creating the same IF from pulse to pulse. Hence, no wideband receiver, no high ADC sample rates. Mostly the same single tone superhet you had before frequency domain sampling. From a pedagogical standpoint, the author shows this is the inverse of what we see in an FFT of a time domain pulse train where a series of PRF harmonics fall under a sync function whose width is set by the inverse of the pulsewidth. Instead, if we transmit those harmonics we can inverse FFT the data for a time (range) domain compression. A really fine book, with just one complaint common to all from Artech House: they never tell us a spec about the author. We're left wondering about the guy's experience, background, history or even if they still breathe. Based on the foreword, Wehner may have been at Arizona State but who can say? Google seems not to find him. Hopefully he's still among us and up to 3rd Edition.
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Reading Progress

May 14, 2011 – Started Reading
October 13, 2011 – Finished Reading
March 30, 2020 – Shelved

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