Communications: directive radio wave systems and devices (e.g. – Determining distance – With remote cooperating station
Patent
1986-02-20
1988-07-12
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With remote cooperating station
342 43, 342 51, 342127, G01S 1374
Patent
active
047573155
ABSTRACT:
A signal is transmitted from a first location to a remote second location where a target carrying a transponder is positioned. The transponder re-radiates the signal to the first location where it is received. A phase comparator generates from the transmitted and received signals a measurement of their phase difference which is functionally related to the distance between the first and second locations. In one embodiment, the transponder is a passive parametric oscillator, being powered by energy received from the transmitted signal, which generates and transmits a subharmonic of the transmitted signal.
REFERENCES:
patent: 3243812 (1966-03-01), Williams
patent: 4170773 (1979-10-01), Fitzsimmons et al.
patent: 4314373 (1982-02-01), Sellers
Kobayashi Herbert S.
Lichtenberg Christopher L.
Shores Paul W.
Barr Hardie R.
Blum Theodore M.
Fein Edward K.
Gregory Bernarr Earl
Manning John R.
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