US 9,810,774 B2
Short-range point defense radar
Peter S. Wittenberg, Creve Coeur, MO (US)
Assigned to The Boeing Company, Chicago, IL (US)
Filed by The Boeing Company, Chicago, IL (US)
Filed on Nov. 13, 2014, as Appl. No. 14/540,116.
Prior Publication US 2016/0139254 A1, May 19, 2016
Int. Cl. G01S 7/35 (2006.01); G01S 13/34 (2006.01); G01S 13/44 (2006.01); G01S 13/58 (2006.01); G01S 7/00 (2006.01); G01S 13/00 (2006.01); G01S 13/02 (2006.01)
CPC G01S 7/354 (2013.01) [G01S 13/343 (2013.01); G01S 13/4463 (2013.01); G01S 13/584 (2013.01); G01S 13/003 (2013.01); G01S 2007/356 (2013.01); G01S 2013/0263 (2013.01)] 20 Claims
OG exemplary drawing
 
19. A radar system capable of simultaneous detection of multiple short-range targets, comprising:
an exciter capable of generating frequency-modulated continuous wave radio frequency signals comprising a sequence of linear frequency-modulated sweeps;
a receiver comprising a multiplicity of mixers for mixing radio frequency signals with replicas of said frequency-modulated continuous wave radio frequency signals and outputting analog signals;
one or more antennas for converting frequency-modulated continuous wave radio frequency signals generated by said exciter into electromagnetic waves and converting returned electromagnetic waves into radio frequency signals which are sent to said receiver;
means for converting analog signals from said receiver into digital samples;
a digital azimuth beamformer that forms a multiplicity of narrow azimuth beams from digital samples produced for each linear frequency-modulated sweep;
a first digital elevation beamformer that forms a multiplicity of fan beams from the multiplicity of narrow azimuth beams produced for each linear frequency-modulated sweep;
a digital signal processor programmed to detect any fan beams of said multiplicity of pencil beams having a characteristic indicative that radar signals were reflected from a target in the field of regard for each linear frequency-modulated sweep; and
a second digital elevation beamformer that forms a multiplicity of pencil beams for any fan beam for which a target was detected.