A Method of Improving SCR for FM-CW Radar

This paper proposes a new method for improving signal-to-clutter ratio (SCR) for frequency modulated continuous wave (FM-CW) radar. Received signals can be categorized into two types due to either a target or clutter. Target surfaces are generally smoother than clutter surfaces, and thus target signals with different carrier frequencies tend to have stronger correlation than that of clutter. The autocorrelation of linearly FM waveforms from the target and the clutter, when the frequency range is chosen to be large enough, are expected to be significantly different. Based on this statistical difference, the target statistical characteristic is estimated from received signals only, and a matched filter is then designed for improving SCR.