Simulation and measurement of 24 GHz Short Range Radar (SRR) Interference

The automotive industry is currently considering the introduction of Short Range Radars operating near 24 GHz for improving road traffic safety. Short Range Radars are intended to observe the full azimuthal space cover around a vehicle using up to eight sensors. The sensors would operate in an ultra wideband (UWB) mode, occupying 3 to 5 GHz of bandwidth. Interference from SRR transmitters with passive microwave remote sensing satellites could occur as the result of several coupling mechanisms, including direct coupling via the transmit antenna beam and scattering and diffraction of the transmitted signals from leading vehicles, buildings, and other nearby objects. In this study, we estimate the amount of coupling anticipated to occur from SRRs, including the direct and scattered contributions. The calculations are based on bistatic scattering measurements at of a typical automobile and ray optical simulations of reflection and propagation in an urban environment.