Journal of Electronics & Information Technology (电子与信息学报) 2011/33:5 PP.1107-1113
Considering the issue of huge data rate in DBF-SAR system, the feasibility of one-bit quantization under low signal-to-noise ratio condition is analyzed by two methods. In the first method, each sample of echo is quantized into one bit, while in the second, samples of both echo and range matched filter are quantized into one bit. Theoretical analysis and numerical experiments indicate that, both methods can correctly get the positions and scattering characteristic of targets, and keep the spatial resolutions. However, false targets and high side lobe are generated, and false targets become more obvious with higher SNR. Therefore, one-bit quantization is feasible when single channel echo’s SNR is lower than –5 dB.
Key words：SAR,Digital BeamForming (DBF),Scan-on-receive,One-bit quantization,SNR
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