DOI: 10.3724/SP.J.1146.2013.00390

Journal of Electronics & Information Technology (电子与信息学报) 2013/35:12 PP.2823-2828

Nadir and Range Ambiguity Suppression Based on Real-time Digital Beam Froming in Spaceborne SAR

Nadir echo and the echo from the range ambiguity points will produce serious interference to SAR image. To deal with this problem, a method which can avoid the influence of these useless signal is proposed in this paper. This method is based on the Digital Beam Forming (DBF) theory while the received echoes are weighted in real-time and the ambiguity points echo will be eliminated while maintaining the useful signal at the same time. This method can also provide more possibilities for the selection of Pulse Repetition Frequency (PRF) and reduce the difficulty of the spaceborne SAR system design. The simulation results with the point targets validate the effectiveness of the proposed method.

Key words:SAR,Digital Beam Forming (DBF),Nadir,Range ambiguity

ReleaseDate:2014-07-21 17:01:14