Location system and method that achieves time synchronized network performance using unsynchronized receiver clocks
First Claim
Patent Images
1. A system for locating an object within a monitored environment comprising:
- a tag transmitter that transmits an RF signal and associated with an object;
a plurality of receivers within the monitored environment for receiving the RF signal from the tag transmitter, said receivers having unsynchronized clocks;
a processor operative with each receiver for determining clock timing relationships for the clocks based on one of at least the propagation or processing delays in the receivers for synchronizing receiver performance, wherein said processor is operative for conducting differentiation of the time of arrival signals received from a tag transmitter to locate an object associated with the tag transmitter.
10 Assignments
0 Petitions
Accused Products
Abstract
A system for locating an object within a monitored environment includes a tag transmitter that transmits an RF signal to receivers having unsynchronized clocks. A processor is operative with each receiver and determines clock timing relationships for the clocks based on one of at least propagation or processing delays in the receivers to synchronize receiver performance.
-
Citations
52 Claims
-
1. A system for locating an object within a monitored environment comprising:
-
a tag transmitter that transmits an RF signal and associated with an object; a plurality of receivers within the monitored environment for receiving the RF signal from the tag transmitter, said receivers having unsynchronized clocks; a processor operative with each receiver for determining clock timing relationships for the clocks based on one of at least the propagation or processing delays in the receivers for synchronizing receiver performance, wherein said processor is operative for conducting differentiation of the time of arrival signals received from a tag transmitter to locate an object associated with the tag transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A system for time synchronizing a network comprising:
-
a tag transmitter positioned at a known location that transmits an RF signal; a plurality of receivers operative as network nodes for receiving the RF signal from the tag transmitter, said receivers having unsynchronized clocks; a processor operative with each receiver for determining clock timing relationships for the clocks at a receiver based on one of at least the propagation or processing delays in the receivers for synchronizing receiver performance. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
-
-
27. A method for locating an object within a monitored environment, which comprises:
-
transmitting an RF signal from a tag transmitter associated with an object to be located; receiving the RF signal at a plurality of receivers having unsynchronized clocks and positioned within the monitored environment; transmitting to a processor the time of arrival of the received RF signals based on the unsynchronized clock time at each respective receiver; determining clock timing relationships for the clocks based on one of at least the propagation or processing delays in the receivers for synchronizing receiver performance; and conducting differentiation of the time of arrival signals received from the tag transmitter to locate an object associated with the tag transmitter. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
-
-
40. A method for time synchronizing a network which comprises:
-
transmitting an RF signal from a tag transmitter positioned at a known location; receiving the RF signal at a plurality of receivers operative as network nodes and having unsynchronized clocks; transmitting to a processor the time of arrival of any received RF signal based on an unsynchronized clock time; and determining clock timing relationships for the clocks based on one of at least the propagation or processing delays in the receivers for synchronizing receiver performance. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
-
Specification