초록 ▼

The disclosure relates to radar methods and systems for directionally selective detection of objects and determination of the distances to the objects. A rectangular-wave frequency-shifted radar signal is employed. This radar signal may be generated by inducing a directionally dependent Doppler shif

The disclosure relates to radar methods and systems for directionally selective detection of objects and determination of the distances to the objects. A rectangular-wave frequency-shifted radar signal is employed. This radar signal may be generated by inducing a directionally dependent Doppler shift which permits directionally selective detection. Higher and lower frequency portions of the returned radar signal are separately frequency converted and phase compared to determine range. In a preferred embodiment, a collision avoidance system for automobiles is provided.

대표청구항 ▼

A method for determining the distance to an object comprising the steps of: broadcasting a carrier wave having abrupt frequency shifts; receiving the carrier wave returned by reflection from the object; frequency converting a higher frequency portion of the received carrier wave to produce a first s

A method for determining the distance to an object comprising the steps of: broadcasting a carrier wave having abrupt frequency shifts; receiving the carrier wave returned by reflection from the object; frequency converting a higher frequency portion of the received carrier wave to produce a first signal within a predetermined frequency range; separately frequency converting a lower frequency portion of the received carrier wave to produce a second signal within the same predetermined frequency range; and producing a signal related in value to the distance of the object responsive to the phase difference between the first and second signals.