Automatic synchronous tuning of narrowband receivers of a wireless location system for voice/traffic channel tracking
First Claim
1. A method for use in a wireless location system to locate a wireless transmitter using a plurality of narrowband receivers, comprising:
- (a) causing said plurality of receivers to follow an automatic sequential tuning mode of operation in which the receivers sequentially and in unison tune to a plurality of predefined RF channels and receive signal transmissions in said channels; and
(b) performing location processing on the signals received during the automatic sequential tuning mode of operation.
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Accused Products
Abstract
In a wireless location system, narrowband receivers are used in a mode, known as automatic synchronous or sequential tuning, in which the receivers are tuned sequentially and in unison to a plurality of predefined RF channels. Signal transmissions of interest in these channels are digitally recorded and used in location processing. A location record or report is generated to identify an estimated location of one or more wireless transmitters. The identity of the located transmitter(s) is determined by matching the location record to data indicating which wireless transmitters were in use at a time corresponding to the location record, and which cell sites and RF channels were used by each wireless transmitter. This method is especially suited for voice or traffic channel tracking of wireless mobile transmitters, such as cellular telephones.
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Citations
39 Claims
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1. A method for use in a wireless location system to locate a wireless transmitter using a plurality of narrowband receivers, comprising:
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(a) causing said plurality of receivers to follow an automatic sequential tuning mode of operation in which the receivers sequentially and in unison tune to a plurality of predefined RF channels and receive signal transmissions in said channels; and
(b) performing location processing on the signals received during the automatic sequential tuning mode of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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15. A method for use in a wireless location system to locate wireless transmitters using a plurality of narrowband receivers, comprising:
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(a) using said plurality of receivers in a mode of operation in which the receivers sequentially and in unison are tuned to a plurality of predefined RF channels and receive signal transmissions in said channels;
(b) performing location processing on the signals received during step (a); and
(c) generating a location record identifying an estimated location of at least one wireless transmitter.
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25. A wireless location system (WLS) overlaid on an associated wireless communications system, comprising:
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a pluraity of geographically separated signal collection systems comprising narrowband receivers; and
means for sequentially and in unison tuning said receivers to a plurality of predefined RF channels, and for recording signal transmissions in said channels.
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Specification