Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Device actuated by presence of land vehicle
Patent
1992-03-30
1993-11-30
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Device actuated by presence of land vehicle
342114, 342115, G01S 1362
Patent
active
052669548
ABSTRACT:
The present invention provides a microwave vehicle detector which includes a transceiver for transmitting microwave energy into a desired target area and for receiving reflections of this microwave energy from vehicle movement in this target area. The transceiver includes first and second diodes for enabling the microwave vehicle detector to determine the direction of vehicle movement relative to the position of the microwave vehicle detector. In this regard, these diodes are balanced, such that a predetermined phase difference will be produced between the doppler shift signals generated by these diodes. This phase difference is analyzed by a microprocessor to determine the speed and direction of the vehicle being detected.
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Lang, Jr. William R.
Orlowski David P.
Microwave Sensors
Tubbesing T. H.
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