Method and apparatus for locating a transceiver
First Claim
Patent Images
1. A radio system comprising:
- a plurality of base stations and a radio narrowband transceiver, operating in any VHF, UHF and 700/800 MHz frequency bands;
the radio narrowband transceiver exchanging voice or data on a conventional narrowband channel of a plurality of conventional narrowband channels with a base station of the plurality of base stations, the radio narrowband transceiver having a voltage controlled oscillator generating a non-linear wideband chirp signal that non-linearly sweeps across the plurality of conventional narrowband channels, and transmitting the generated non-linear wideband chirp signal to all of the plurality of base stations; and
the plurality of base stations, each having a matched filter, receiving the non-linear wideband chirp signal from the radio narrowband transceiver, determining an identity of the radio narrowband transceiver based on a phase variation of the non-linear wideband chirp signal and triangulating a location of the identified radio narrowband transceiver using the received non-linear wideband chirp signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A radio system for locating a radio transceiver configured to exchange voice or data with a plurality of base stations on a narrowband channel is described. The system includes the radio transceiver that exchanges voice or data on the narrowband channel with a base station of the plurality of base stations and also to periodically transmit a chirp signal to the plurality of base stations. The radio system also includes the plurality of base stations each with a matched filter configured to receive the periodically transmitted chirp signal and to triangulate a location of the radio transceiver using the received chirp signal.
-
Citations
26 Claims
-
1. A radio system comprising:
-
a plurality of base stations and a radio narrowband transceiver, operating in any VHF, UHF and 700/800 MHz frequency bands; the radio narrowband transceiver exchanging voice or data on a conventional narrowband channel of a plurality of conventional narrowband channels with a base station of the plurality of base stations, the radio narrowband transceiver having a voltage controlled oscillator generating a non-linear wideband chirp signal that non-linearly sweeps across the plurality of conventional narrowband channels, and transmitting the generated non-linear wideband chirp signal to all of the plurality of base stations; and the plurality of base stations, each having a matched filter, receiving the non-linear wideband chirp signal from the radio narrowband transceiver, determining an identity of the radio narrowband transceiver based on a phase variation of the non-linear wideband chirp signal and triangulating a location of the identified radio narrowband transceiver using the received non-linear wideband chirp signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A radio narrowband transceiver comprising:
-
a transceiver configured to operate in any VHF, UHF, and 700/800 MHz frequency band, to exchange voice or data with a base station of the plurality of base stations on a conventional narrowband channel of a plurality of conventional narrowband channels, and to periodically transmit a non-linear wideband chirp signal to all of a plurality of base stations, wherein the non-linear wideband chirp signal allows each of the plurality of base stations to determine an identity of the radio narrowband transceiver based on a phase variation of the non-linear wideband chirp signal and to triangulate a location of the radio narrowband transceiver; and a voltage controlled oscillator coupled to the transceiver and configured to generate the non-linear wideband chirp signal that non-linearly sweeps across the plurality of conventional narrowband channels. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
-
18. A radio system comprising:
-
a radio narrowband transceiver configured to operate in any VHF, UHF and 700/800 MHz frequency bands, the radio narrowband transceiver, comprising; a transceiver configured to exchange voice or data with a base station of a plurality of base stations on a conventional narrowband channel of a plurality of conventional narrowband channels and to periodically transmit a non-linear wideband chirp signal to all of a plurality of base stations, and a voltage controlled oscillator coupled to the transceiver configured to generate the non-linear wideband chirp signal that non-linearly sweeps across the plurality of conventional narrowband channels; and the plurality of base stations, each including a matched filter configured to receive the non-linear wideband chirp signal transmitted by the radio narrowband transceiver and to determine an identity of the radio narrowband transceiver based on a phase variation of the non-linear wideband chirp signal, a timing function configured to measure a difference in time of arrival of the received non-linear wideband chirp signal received by the matched filter, and a triangulation processor configured to triangulate a location of the identified radio narrowband transceiver relative to the plurality of base stations based on the measured difference in the time of arrival of the received non-linear wideband chirp signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
-
-
26. A base station in a radio system, the base station comprising:
-
a matched filter configured to receive a non-linear wideband chirp signal transmitted by a radio narrowband transceiver and to determine an identity of the radio narrowband transceiver based on a phase variation of the non-linear wideband chirp signal, wherein the non-linear wideband chirp signal non-linearly sweeps across all of a plurality of conventional narrowband channels; a timing function configured to measure a difference in time of arrival of the received non-linear wideband chirp signal received by the matched filter; and a triangulation processor configured to triangulate a location of the identified radio narrowband transceiver relative to a plurality of base stations based on the measured difference in the time of arrival of the received non-linear wideband chirp signal.
-
Specification