SYSTEM AND METHOD FOR DETERMINING SIGNAL SOURCE LOCATION IN WIRELESS LOCAL AREA NETWORK
First Claim
Patent Images
1. A system for locating a signal source in a wireless local area network (WLAN), comprising:
- at least one WLAN signal source positioned at a known location that transmits a wireless radio frequency (RF) signal;
a plurality of receivers having unsynchronized clocks that receive the RF signal from the at least one WLAN signal source; and
a processor operative with the receivers that measures the time-of-arrival of the RF signal at each receiver and uses a timing relationship from the fixed, known location of the at least one WLAN signal source to relate time-of-arrival measurements from a signal arriving from a WLAN signal source at an unknown location within the WLAN.
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Abstract
A system and method locates a wireless local area network (WLAN) signal source. A wireless LAN signal as an RF signal is propagated from a WLAN signal source at a fixed, known location to a plurality of receivers having unsynchronized clocks. The time-of-arrival is measured at each receiver and the timing relationship from the fixed, known location of the signal source is used to relate time-of-arrival measurements from a signal arriving from an unknown location.
182 Citations
27 Claims
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1. A system for locating a signal source in a wireless local area network (WLAN), comprising:
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at least one WLAN signal source positioned at a known location that transmits a wireless radio frequency (RF) signal; a plurality of receivers having unsynchronized clocks that receive the RF signal from the at least one WLAN signal source; and a processor operative with the receivers that measures the time-of-arrival of the RF signal at each receiver and uses a timing relationship from the fixed, known location of the at least one WLAN signal source to relate time-of-arrival measurements from a signal arriving from a WLAN signal source at an unknown location within the WLAN. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for locating a wireless station in communication with a wireless local area network (WLAN) comprising:
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a plurality of wireless mobile devices each forming a WLAN signal source that transmit RF signals; a plurality of cells defining a WLAN and each having a receiver forming an access point in the WLAN and adapted for communicating with WLAN signal sources, wherein at least one WLAN signal source is positioned at a known location; and a processor communicating with each receiver that measures at each receiver the time-of-arrival of the RF signal transmitted from the WLAN signal source at a known location and uses a timing relationship from the fixed, known location of the at least one WLAN signal source to relate time-of-arrival measurements from a signal arriving from a WLAN signal source at an unknown location within the WLAN. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for locating a signal source in a wireless local area network (WLAN), which comprises:
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propagating a wireless radio frequency (RF) signal from a WLAN signal source at a fixed, known location to a plurality of receivers having unsynchronized clocks; and measuring the time-of-arrival of the RF signal at each receiver and using the timing relationship from the fixed, known location of the WLAN signal source to relate time-of-arrival measurements from a signal arriving from a WLAN signal source at an unknown location within the WLAN. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification