Three-dimensional moving target indication for FM-CW radar

A system has been devised to process the output of an FM-CW radar to detect moving targets. In an FM-CW radar with linear FM sweep and a homodyne receiver, the targets in the output have frequency proportional to range. The MTI detection scheme described here depends on a target being in clutter; the baseband signal output varies from sweep to sweep due to relative motion between the target and the stationary clutter. Theory is derived to analyze this process. The process was simulated on a digital computer, and a field test was done. Simulation and field test results are shown. The simulation results show capability over a range of clutter from 0 db to -50 db, and the field test results agreed well with theory.