Patent ID: 7433652

Claim:
A method comprising: (a) receiving a signal-strength measurement for a signal that traverses a path between a first radio and a second radio; (b) generating an estimate of the location of said first radio, wherein said estimate of the location of said first radio is based on: (i) said signal-strength measurement, and (ii) a path-loss map that is indicative of the path loss between the location of said second radio and a non-empty set S of locations; wherein said path-loss map is based on a path-loss model that estimates the effects of azimuth orientation on path loss; and wherein said path-loss model is based on a matrix that has N rows and L columns; and wherein N and L are positive integers; and wherein said path-loss map comprises measurements at N locations {λ 1 , λ 2 , . . . , λ N }⊂S; and wherein for all iε{1, . . . , N} and jε{1, . . . , L} the element of said matrix at row i and column j equals cos(j·θ i ), wherein θ i is the bearing angle of location λ i with respect to the boresight of said second radio.