ANALYSIS OF WAVEFORM ERRORS IN MILLIMETER-WAVE LFMCW SYNTHETIC APERTURE RADAR |
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Authors: | Wenqin Wang |
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Institution: | (1) National Key Laboratory of Microwave Imaging Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing, 100080, P. R. China |
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Abstract: | In remote sensing applications, there is a special interest in the lightweight, cost effective, and high resolution imaging
sensors. The combination of linearly frequency modulated continuous wave (LFMCW) technology and synthetic aperture radar (SAR)
technique can lead to such a sensor. This paper concentrates on the analysis of waveform errors in millimeter-wave (MMW) LFMCW
SAR. The generating scheme of millimeter-wave LFMCW waveforms with phase locked loop (PLL) and direct digital synthesizer
(DDS) combined frequency synthesizer is investigated. The impacts of quantization errors, spurs, and frequency nonlinearities
are analyzed. Simulation results show that the quality of LFMCW waveforms has a direct influence on the SAR images. Hence
a scheme of frequency synthesizer to achieve high performance MMW LFMCW waveform is proposed. This synthesizer driven by a
DDS array can adaptive suppress the spurious level without degradation of excellent frequency linearity and fast switching
speed. |
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Keywords: | Millimeter-wave Synthetic aperture radar (SAR) Linearly frequency modulated continuous wave (LFMCW) Radar Phase errors Waveform |
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