Patent ID: 7999738

Claim:
A method of monitoring angular orientation, comprising: acquiring a sum power signal from a sum combination of a first signal output of an antenna array and a second signal output of the antenna array; acquiring a difference power signal from a difference combination of the first signal output of the antenna array and the second signal output of the antenna array; deriving a first received signal strength indication value associated with the sum power signal and associated with approximately a first time; deriving a second received signal strength indication value associated with the difference power signal and associated with approximately the first time; utilizing the first received signal strength indication value and the second received signal strength indication value to generate a first measure of an off-bore-sight angle of the antenna array relative to a position of a transmitting radiofrequency signal source at approximately the first time; where the antenna array comprises a first antenna portion and a second antenna portion; where the first antenna portion is configured to couple to radiofrequency radiation transmitted from the transmitting radiofrequency signal source and provide the first signal output; and where the second antenna portion is configured to couple to radiofrequency radiation transmitted from the transmitting radiofrequency signal source and provide the second signal output.