초록 ▼

A radar highway motor vehicle guidance apparatus for guiding a land vehicle along a roadway using a forward looking, lateral position sensing, monopulse tracking radar guidance apparatus which transmits radar pulses forward of the vehicle. The pulses are reflected back to the vehicle by a stripe dis

A radar highway motor vehicle guidance apparatus for guiding a land vehicle along a roadway using a forward looking, lateral position sensing, monopulse tracking radar guidance apparatus which transmits radar pulses forward of the vehicle. The pulses are reflected back to the vehicle by a stripe distributed along the roadway. The stripe is a frequency selective surface which generates retro-reflective grating lobes at an operating frequency of the tracking radar. Operating the radar at two frequencies allows the radar to look at regions spaced at two different distances from the front of the vehicle. Highway related information may be encoded in the frequency selective surface by variations in the shape or dimensions of the frequency selective stripe morphology in order to modulate the reflected signal with highway information which is then also detected at the radar receiver. Target discrimination is enhanced by using pseudo random codes and matching antenna polarization with stripe polarization.

대표청구항 ▼

A radar vehicle guidance apparatus for use in guiding a land vehicle along a roadway and comprising: (a) a forward looking, lateral position sensing, tracking radar guidance apparatus mounted to the vehicle wherein the radar radiates and detects at least two frequencies, the two frequencies being se

A radar vehicle guidance apparatus for use in guiding a land vehicle along a roadway and comprising: (a) a forward looking, lateral position sensing, tracking radar guidance apparatus mounted to the vehicle wherein the radar radiates and detects at least two frequencies, the two frequencies being selected to generate a retro-reflected grating lobe at two angles above the roadway and corresponding to two different distances from the vehicle; and (b) an elongated stripe distributed along the roadway in the direction of vehicle travel, the stripe comprising substantially laterally aligned antenna elements substantially uniformly spaced at least one-half the wavelength of the radar frequency, formed of electrically conductive material and spaced to provide a frequency selective surface generating retro-reflective, non-specular grating lobes at the operating frequencies of the tracking radar.