Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-03-10
1982-06-15
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 177, G01S 1360, G01S 740
Patent
active
043353827
ABSTRACT:
A traffic radar system is provided in which the speed of a target vehicle is determined by measuring the difference in frequency between a component of a doppler signal which has a frequency proportional to the relative speed of the target vehicle and a moving patrol vehicle and a reference signal having a frequency proportional to the speed of the patrol vehicle. The reference signal is developed from a tachometer device which generates a periodic signal having a frequency proportional to the rotational speed of a vehicle wheel and phase-locked loop arrangements including adjustable dividers are provided for locking an oscillator to the tachometer signal and generating a reference signal at a frequency proportional to the actual speed of the patrol vehicle. For calibration, a component of the doppler signal produced from reflections from stationary objects is used.
REFERENCES:
patent: 3936824 (1976-02-01), Aker et al.
patent: 4214243 (1980-07-01), Patterson
patent: 4236140 (1980-11-01), Aker et al.
Brown Bryce K.
Correll Stephen
Jenkins Darrell D.
Mayfield Lawrence E.
Schreiber Jay
Decatur Electronics Inc.
Tubbesing T. H.
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