DOI: 10.3724/SP.J.1146.2013.00083

Journal of Electronics & Information Technology (电子与信息学报) 2013/35:12 PP.2857-2862

Study on Deambiguity Algorithm for Double Antenna Forward Looking Missile Borne SAR

Forward looking missile borne SAR suffers the issue of left/right ambiguity in SAR images because the targets situated symmetrically about the moving trace of radar have the same Doppler histories. Considering this issue, the imaging model of double antenna forward looking SAR is established based on the characteristics of the missile borne SAR, and the signal features in the double antenna system are analyzed. Based on the above analysis, a scheme is put forward to solve the left/right ambiguity. Firstly, two ambiguous SAR images are obtained with squint SAR imaging algorithm. Then the left/right ambiguity is solved by beam-forming based on range delay difference between different antennas. Finally, the point target imaging simulation testifies the validity of the proposed algorithm.

Key words:Missile-borne SAR,Forward looking,Left/right ambiguity,Beam-forming

ReleaseDate:2014-07-21 17:04:35