Communications: electrical – Selective – Having indication or alarm
Patent
1980-02-01
1981-11-24
Groody, James J.
Communications: electrical
Selective
Having indication or alarm
324247, 340 38R, 343700MS, 343895, G08G 101, H01Q 136
Patent
active
043027466
ABSTRACT:
An improved self-powered vehicle detector (SPVD) uses a two-axis magnetomr to sense a vehicle's magnetic signature and then telemeter vehicle presence information to a roadside receiver. The SPVD system includes digital nulling loops to cancel D.C. offset changes in the magnetometic output, a multi-tone code transmitter to transmit vehicle presence and SPVD condition signal, and an omnidirectional microstrip antenna to simplify installation and maintenance of the SPVD.
REFERENCES:
patent: 3758775 (1973-09-01), Hopkins
patent: 3984764 (1976-10-01), Koerner
patent: 3989932 (1976-11-01), Koerner
patent: 4179744 (1979-12-01), Lowe
Brown Robert E.
Grine Wayne R.
Krall Albert D.
Lenko Daniel S.
Mills Milton K.
Branning A. L.
Groody James J.
Lashmit D. A.
Sciascia R. S.
The United States of America as represented by the Secretary of
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