Patent ID: 7916085

Claim:
A method for locating a source of a radio frequency emission, the method comprising: receiving the radio frequency emission with at least two receivers during movement of at least one of the at least two receivers; recording data from the received radio frequency emission from at least two receiving points during at least one time interval to create recorded data; recording positional data of at least one of the receivers; tagging the recorded data of the radio frequency emission and the positional data to create tagged data to determine a proximate position of the at least one receiver at the at least one time interval during which the radio frequency emission was received; transmitting the tagged data to a processing unit; defining a search grid within which to search for the source of the radio frequency emission, wherein the search grid comprises a plurality of grid points; motion compensating the tagged data, thereby creating motion compensated data; assigning a value to individual ones of the plurality of grid points based on a relative phase coherence of the motion compensated data for the at least one time interval; and determining a location within the search grid having a highest assigned value, thereby determining the source of the radio frequency emission; wherein the motion compensating further comprises: identifying a first data signal from a stationary receiver of the at least two receivers and a second data signal from a moving receiver of the at least two receivers; multiplying the first data signal and the second data signal to create an intermediate product signal; multiplying the intermediate product signal by a set of quantized complex chirp waveforms to create de-chirped product signals; and calculating Fourier coefficients of the de-chirped product signals to create coherent integration interval magnitudes.