Patent Number: 6,670,920

Title: System and method for single platform, synthetic aperture geo-location ofemitters

Abstract: The determination of the geographical location of a signal emitter by thecoherent, time integrated measurement of received signal wavefront phasedifferences through a synthetic aperture and the reconstruction of thewavefront of the received signal. The location of an emitter is determinedby coherently measuring the phase gradient of an emitted signal atmeasurement points across a measurement aperture. Each measured phasegradient is integrated to determine a vector having a direction from themeasurement point to the signal emitter and an amplitude proportional tothe received signal. A figure of merit is determined for each possiblelocation of the signal emitter by integrating each vector with respect toa propagation path between the measurement point of the vector and thepossible location of the signal emitter, and the location of the signalemitter is determined as the possible location of the signal emitterhaving the highest figure of merit. The measurement aperture is generatedby motion of a receiving aperture along the path and the receivingaperture is generated as by synthetic aperture methods. The receivingaperture may be mounted on an airborne platform and a positional towedbody.

Inventors: Herrick; David L. (Mont Vernon, NH)

Assignee:

International Classification: G01S 13/90 (20060101); G01S 13/00 (20060101); G01S 5/06 (20060101); G01S 5/04 (20060101); G01S 3/14 (20060101); G01S 3/48 (20060101); G01S 003/16 (); G01S 005/04 ()

Expiration Date: 12/32016