Mobile radiotelephone station two-way ranging system
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United States of America Patent
Stats
-
Oct 21, 1980
Grant Date -
N/A
app pub date -
Nov 9, 1978
filing date -
Nov 9, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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