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Small and Short-Range Radar Systems by Gregory L. Charvat

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Chapter 3

Frequency Modulated Continuous Wave (FMCW) Radar

Doppler measurements were demonstrated using coherent CW radar discussed in Chapter 2, where a CW carrier was radiated toward a target scene and the scattered carrier was multiplied by a copy of the original, resulting in the measurement of phase over time, thereby providing a Doppler measurement. In this chapter ranging will be achieved by FM modulating the CW oscillator in such a way that its frequency changes linearly with time. By multiplying this transmitted waveform by what is scattered off of the target, range-to-target distance can be determined.

FMCW radar was originally developed for radar altimeters for aircraft in the mid 1930’s. Today, FMCW is useful in applications where ...

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