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Circulate shifted OFDM chirp waveform diversity design with digital beamforming for MIMO SAR

Science China(Information Sciences) 2017年第10期60卷 217-228页

作者： Shangwen LIU Zenghui ZHANG Wenxian YU Shanghai Key Laboratory of Intelligent Sensing and Recognition Shanghai Jiao Tong University

Waveform diversity design has always been the key to multiple-input multiple-output(MIMO)synthetic aperture radar(SAR) systems, and it is known that synthetic integral side lobe ratio(SISLR) is a more optimal indicator than the integral side lobe ratio(ISLR) to evaluate the orthogonality between different MIMO SAR waveforms. This paper presents proof that it is difficult to obtain the SISLR of an existing waveform such that it is sufficiently low to achieve high SNR for SAR imaging. Thus, it is necessary to find a way to separate these MIMO SAR waveforms in other domains, for example, a spatial domain by digital beamforming(DBF). Learning from Krieger's idea of short-term shift-orthogonal waveforms and using joint time-frequency transforms(Gabor transform) to prove that for most existing SAR waveforms cyclic shift is a good operation with which to generate short-term shift-orthogonal waveforms. This paper presents the designs of four circulate shifted OFDM chirp waveforms, which have a much lower SISLR and retain all the advantages of the classical chirp waveform such as a large time-bandwidth product, constant amplitude, implementation simplicity, and good Doppler tolerance.

关键词： MIMO SAR Gabor transform cyclic shift OFDM chirp waveform synthetic integral side lobe ratio(SISLR)

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Invariant Joint Transform CorrelatorⅠ: Mapping Filter

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Chinese Journal of Lasers 1997年第1期B6卷 64-70页

作者： FENG Jihong WU Minxian JIN Guofan YAN Shuhua(Tainghua University, Precision Department,100084 Beijing, China) Tsinghua Univ Beijing China

A joint transform correlator incorporating coordinate transformation technique is propescd to perform invariant pattern recognition. Instead of an input image or its Fourier transform intensity, the Fourier transform of the input image is directly transformed from rectangular into logarithmic-polar coordinate. All of information is saved, and as a result, multiple objects can be proceased simulataneously. A binary optical component is designed and fabricated to perform coordinate transformation in high efficiency.

关键词： invariant optical pattern recognition cyclic shift joint transform correlator binary optical component

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