Patent ID: 8441391

Claim:
A method for a transponder (MT) adapted to communicate with a remote locator (RL), the method for the transponder (MT) comprising: capturing samples of a signal transmission spectrum with a receiver in the MT; detecting an interrogation signal from the RL when the captured samples correspond to an interrogation signal that is encoded with a specific ID Code associated with the MT; and when the interrogation signal is detected: synthesizing a precise carrier phase, frequency, cadence and timing for subsequent transmission from the received interrogation signal; retrieving a first timing delay (Delay D 1 ) and a first non-repeating noise pattern (Noise N 1 ) for a first signal transmission; encoding the first signal transmission with the first noise pattern (Noise N 1 ); wherein after the expiration of the first timing delay (Delay D 1 ), transmitting the first signal transmission, which is encoded with the first noise pattern (Noise N 1 ), using the precise carrier phase, frequency, cadence and timing; and wherein retrieving the first timing delay (Delay D 1 ) and the first noise pattern (Noise N 1 ) comprises the steps of: determining an index from a hash function, and selecting the first timing delay (Delay D 1 ) and the first noise pattern (Noise N 1 ) using the index.