Communications: directive radio wave systems and devices (e.g. – Determining distance – With remote cooperating station
Patent
1988-01-22
1990-03-13
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With remote cooperating station
342 42, G01S 1308, G01S 1374
Patent
active
049086278
ABSTRACT:
Two miniaturized transceivers, each selectively responsive to predetermined radio frequency (r.f.) transmissions which may be coded, consisting of one control unit and one transponder unit. Transmission by the control unit of a modulated frequency which is received and decoded by the transponder will generate a like reply from the transponder whose round-trip delay is timed and because of the known velocity of radio waves can thus be displayed as the distance between the two units. An adjustable maximum range limit in the control unit will generate an audible, visual or other alerting signal in the control unit when the distance between the two units is exceeded. Such signal is also obtained when the signal from the transponder is interrupted. Low-power consumption can be effected for battery operation by arranging short periodic bursts of r.f. energy between the two transceivers, there being logical means to time-align the respective transmit and receive modes of the two units. The transponder transceiver can be considered as behaving like an "active" reflector of the predetermined r.f. signals from the control unit.
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patent: 4370653 (1983-01-01), Crowley
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patent: 4646092 (1987-02-01), Schreuder
patent: 4757315 (1988-07-01), Lichtenberg et al.
Hellner Mark
Tarcza Thomas H.
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