Mobile radiotelephone station two-way ranging system

Details Mobile radiotelephone station two-way ranging system Mobile radiotelephone station two-way ranging system

1978-11-09

1980-10-21

Konick, Bernard

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343112D, 455 31, H04Q 704

Patent

active

042296200

ABSTRACT:
Some cellular mobile radiotelephone systems use tones for certain call connection supervisory functions on radio links. The presence of the correct tone in a received radio channel call signal is determined by using the received signal for producing (32) a lower frequency tone that is readily selectable (36) from similar tones produced in response to incorrect supervisory tones. The same received call signal is also separately processed to produce (41, 53) supervisory tone phase information that is indicative of range between communicating stations. Several circuits (72; 40 and 46; 59-62) are shown for enhancing the accuracy of the produced phase information of the correct tone.

REFERENCES:
patent: 3663762 (1972-05-01), Joel, Jr.
patent: 3746991 (1973-07-01), Gautney
patent: 3848254 (1974-11-01), Drebinger et al.
patent: 3922677 (1975-11-01), Tomkewitsch et al.
patent: 4025853 (1977-05-01), Addeo
"High Capacity Mobile Telephone System Technical Report", (filed in F.C.C. Docket 18262), Dec. 1971, prepared by Bell Laboratories, pp. 3-13 through 3-20.
"Effects of Multipath Transmission on the Measured Propagation Delay of an FM Signal", IEEE Transactions on Vehicular Technology, vol. VT-18, No. 1, May 1969, pp. 44-52, by J. S. Engel.

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