A Model for Digital Detection of FM-CW Radar in the Presence of Interference

C.H. Bianchi and T.A. Smedstad (USA)


FM, Radar, Detection, Resolution, Receivers, Signal Processing.


This paper examines the signal theory of FM-CW radar systems and the application of digital processing techniques to the recovery of target information. The impact of signal distortions such as range de-correlation and target movement as well as noise and interference on digital detection are modeled and discussed. A model of an FM-CW radar system is shown in Figure 1. As is typical in conventional FM-CW radars, the target return, a continuous signal, is amplified and mixed with a replica of the transmitted signal, also continuous. A composite continuous received signal (so-called FM range residue) is formed from the mixing of the transmitted and returned signals, and it is translated to base-band and provided to the receiver for sampling and analysis. A range estimate is traditionally derived from the measured beat frequency [1]. For a stationary target, the received signal is de-correlated from the transmitted signal in proportion to the distance of the target. For a moving target, the received signal is shifted in frequency proportional to the velocity of the target.

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