Wireless localization techniques in lighting systems
AssigneeKoninklijke Philips N.V.
InventorsXingkai Bao, Sushanta Das, Monisha Ghosh
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Abstract
The invention relates to a system and method for localization positioning in lighting systems. At least two of a Time Difference of Arrival (TDOA), Angle of Arrival (AOA), Received Signal Strength Index (RSSI) and a Position Estimation Algorithm with unified TDOA and RSSI are used to obtain localization positioning. The schemes introduce a maximum-likelihood estimation strategy incorporating a partial derivative matrix for each lighting unit using at least two reference nodes in order to achieve higher accuracy.
Claims38
A method for determining a location of at least one lighting unit in a lighting system, comprising:
- transmitting a signal from the at least one lighting unit;
- estimating the location of the at least one lighting unit using at least two localization protocols and a position estimation method;
- recording at least one of a plurality of reference nodes a time-of-arrival signal from each of the at least one lighting units;
- communicating the recording from the at least one of a plurality of reference nodes to each of the other reference nodes;
- calculating at each of the reference nodes the distance-difference;
- and
- providing the at least two localization protocols into a derivative matrix.
A lighting system for determining a location of at least one lighting unit, comprising:
- at least one reference node estimating the location of the at least one lighting unit using at least two localization protocols and a position estimation method, wherein the at least one reference node:
- records a time-of-arrival signal from each of the at least one lighting units;
- communicates the recording from one of the at least one reference nodes to each of the other at least one reference nodes;
- and
- calculates the distance-difference;
- and wherein the at least two localization protocols are provided into a partial derivative matrix comprising at least two sub-matrices, a first sub-matrix including partial derivatives of a measured angle-of-arrival at the at least one reference node of each of the at least one lighting units with respect to x and y location, and a second sub-matrix including a partial derivative of a measured distance-difference at one of the at least one reference nodes of a corresponding one of the at least one lighting units with respect to x and y location.
Dependencies are inferred from the claim text.