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Enhanced passive coherent location techniques to track and identify UAVs, UCAVs, MAVs, and other objects

  • US 7,782,256 B2
  • Filed: 05/15/2007
  • Issued: 08/24/2010
  • Est. Priority Date: 03/05/1999
  • Status: Expired due to Fees
First Claim
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1. A system for tracking an object, comprising:

  • a receiver receiving a reference transmission on a direct path from a controlled or uncontrolled transmitter, and a scattered transmission originating from a controlled or uncontrolled transmitter, scattered by the object, and then received by the receiver;

    a comparator comparing the received transmissions to determine a frequency-difference-of-arrival thereby establishing a track or tracks for the object or objects, the comparator comprising a subsystem for narrowband pre-detection signal processing receiving input signals include the target transmission and the reference transmission, and correlating the target transmission and the reference transmission using a database of a priori illuminator signals to discriminate between reference transmissions and target transmissions; and

    a tracker updating each track on a predetermined periodic basis, and forwarding each track to the system'"'"'s processing unit for filtering and display.

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