FMCW radar linearizer.

摘要

When linearizing FMCW radars it is customary to produce a synthetic target signal independently of the radar signal and to use the synthetic target signal to linearize the sweeping of the transmitted VCO frequency or the sampling of the radar if signal to be analysed. In order to reduce the overall number of microwave rf components, the present invention uses one mixer (18) to produce the radar if and linearizing if. In one embodiment an rf STALO (32) is coupled by a directional coupler (34) into the return path of the radar signal. In other embodiments (not shown) the mixer comprises a dc biased waveguide harmonic mixer and the STALO generates a lower frequency which is applied to the mixer by way of either the bias port or the radar if output port. The linearizing arrangements (28) disclosed are based on known designs. <IMAGE>