Mobile radiotelephone station two-way ranging system

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

1979-12-17

1982-01-12

Moffitt, James W.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 33, 455 37, H04B 360

Patent

active

043107222

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. Circuits are also shown for separately processing received call signals 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: 3728634 (1973-04-01), Watkinson
patent: 3780230 (1973-12-01), Bowen et al.
patent: 3895191 (1975-07-01), Koganezawa et al.
patent: 4025853 (1977-05-01), Addeo

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