Rangefinder using expanded time delay

Details Rangefinder using expanded time delay Rangefinder using expanded time delay

1979-08-08

1981-10-27

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 1378

Patent

active

042977010

ABSTRACT:
The system is comprised of a plurality of hand held units carried by golfers, a plurality of flagstick units located at a golf course and a master Clubhouse unit. Each hand held unit includes a power source, a transceiver, a distance determining circuit, a keyboard with display, an audio generator and a microprocessor which controls the mode of the hand held unit. Each flagstick unit is comprised of a power source, a transceiver and a controlling microprocessor. The microprocessor includes a plurality of subprograms which control the function of the hand held unit or the flagstick unit. To determine the distance between a hand held unit and a flagstick unit, a button on the keyboard is pressed to select a particular flagstick unit. The microprocessor is activated to activate the audio generator indicating the button was properly pressed and, simultaneously, the distance determining circuit and transceiver are activated. The distance determining circuit is actually a timing circuit which measures the amount of time required for the signal from the transceiver to reach the selected flagstick unit and be retransmitted by the flagstick unit back to the particular hand held unit. The distance determining circuit is actually a capacitor which is linearly charged during transmission time and discharged at a slower rate to determine the amount of charge which is directly proportional to the distance between the hand held unit and the flatstick unit. The hand held units are also provided with a magnetic charging circuit so that the unit can be charged without the use of connections and so that the unit can be embodied in a sealed apparatus.

REFERENCES:
patent: 3144645 (1964-08-01), McIver et al.
patent: 3474460 (1969-10-01), Huebscher
patent: 3573819 (1971-04-01), Mason et al.
patent: 3919708 (1975-11-01), Pudsey
patent: 4005418 (1977-01-01), Gorwara
patent: 4107676 (1978-08-01), Lassiter
patent: 4114151 (1978-09-01), Denne et al.

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