Radar system having isolated transmit and receive feeds at the antenna

摘要

A radar system is disclosed having a rotating antenna that may be used in combination with a coded modulated transponder as part of a vehicle positioning and tracking system. The antenna transmits a pair of frequency modulated continuous wave FMCW electromagnetic signals that have a first polarisation. The first polarisation may be a vertical polarisation. The transmit signals are incident on the transponder which returns an electromagnetic signal back to the antenna having a second polarisation. The second polarisation may be a horizontal polarisation. The transmit and receive feeds at the antenna may be cross polarised and isolated from each other. The rotating antenna may further comprise an optical encoder for determining the angular position of the antenna. The transponder may be passive, retro-reflective or active.