Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Patent
1992-08-04
1994-03-29
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
342103, 342125, 342127, G01S 1374
Patent
active
052989046
ABSTRACT:
A distance measuring system which may be used on a golf course in order for a golfer to accurately measure the distance between the present lie of his golf ball and the hole toward which he is currently advancing the golf ball. A master transceiver station is portably carried by the golfer to be disposed proximate the lie of his ball for measurement purposes, and a remote transceiver system is located in or on each hole's flag marker pole. The present system uses, as the basic measurement frequency, only the frequency of the remote carrier itself. Two separate and distinct phase measurements are made in rapid succession. The first measurement is made with the master RF carrier displaced above the remote carrier frequency by amount equal to the IF frequency, and the second measurement is made with the master carrier frequency displaced below the remote carrier frequency by the same amount. With these two phase measurements, range or distance can be measured unambiguously and accurately over a required distance of at least 300 yards for golf purposes. The phase information from the remote location is communicated to the master location by phase-locking the carriers together. This avoids the necessity of using modulated subcarriers to transmit this information. This, in turn, reduces the occupied bandwidth, simplifies the modulation-demodulation required, and reduces errors normally introduced by the subcarrier filtering processes of the prior art.
REFERENCES:
patent: 3213449 (1965-10-01), Kobayashi et al.
patent: 3725920 (1973-04-01), Kupfer et al.
patent: 4297701 (1981-10-01), Henriques
patent: 4703444 (1987-10-01), Storms, Jr. et al.
patent: 5056106 (1991-10-01), Wang et al.
Roediger Joseph H.
Tubbesing T. H.
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