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Methods and system suppressing clutter in a gain-block, radar-responsive tag system

United States Patent

7,030,805
April 18, 2006
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
Methods and systems reduce clutter interference in a radar-responsive tag system. A radar transmits a series of linear-frequency-modulated pulses and receives echo pulses from nearby terrain and from radar-responsive tags that may be in the imaged scene. Tags in the vicinity of the radar are activated by the radar's pulses. The tags receive and remodulate the radar pulses. Tag processing reverses the direction, in time, of the received waveform's linear frequency modulation. The tag retransmits the remodulated pulses. The radar uses a reversed-chirp de-ramp pulse to process the tag's echo. The invention applies to radar systems compatible with coherent gain-block tags. The invention provides a marked reduction in the strength of residual clutter echoes on each and every echo pulse received by the radar. SAR receiver processing effectively whitens passive-clutter signatures across the range dimension. Clutter suppression of approximately 14 dB is achievable for a typical radar system.
Ormesher; Richard C. (Albuquerque, NM), Axline; Robert M. (Albuquerque, NM)
SANDIA Corporation (Albuquerque, NM)
10/ 898,119
20060017608
July 23, 2004
STATEMENT OF GOVERNMENT INTEREST The U.S. Government has rights in this invention pursuant to Contract DE-AC04-94AL85000 between Sandia Corporation and the U.S. Department of Energy.