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• W4308121596 abstract "Range ambiguity can lead to deterioration of imagery quality for space-borne synthetic aperture radar (SAR). To solve this problem, we propose a mitigating range ambiguity method based on Doppler division multiple access (DDMA) in this paper. With the orthogonality of the DDMA waveform, transmit channels are separated at the receiver. Afterwards, a pre-processed operation for definition domains of different transmit channels is put forward to transform all definition domains into the same one. Thereafter, by multiplying measured data in a transmit channel by the complex conjugation of those in the other channel, a coupling phase term between the ambiguous range and the Doppler can be generated. So, utilizing the coupling phase, the echoes of different ambiguous regions can be distinguished in the slow-time domain, and they are extracted by designing time domain passband filters. Moreover, the images of different extracted ambiguous regions can be reconstructed to compose the whole unambiguous image. Finally, simulation results exhibit the effectiveness of the proposed method." @default.
• W4308121596 created "2022-11-08" @default.
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• W4308121596 date "2022-10-31" @default.
• W4308121596 modified "2023-10-14" @default.
• W4308121596 title "Mitigating Range Ambiguity Method Based on DDMA for SAR Systems" @default.
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• W4308121596 doi "https://doi.org/10.3390/rs14215485" @default.
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