Resolution Analysis of Spatial Modulation Coincidence Imaging Based on Reflective Surface

Resolution Analysis of Spatial Modulation Coincidence Imaging Based on Reflective Surface

The spatial modulation coincidence imaging (SMCI), as a novel kind of microwave coincidence imaging method, is proposed in this paper. The SMCI system provides a new way to produce the time-space independent signal instead of multitransmitter architecture with wideband randomly modulated signal in r...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2018-07, Vol.56 (7), p.3762-3771
Main Authors: He, Yuchen, Zhu, Shitao, Dong, Guoxiang, Zhang, Songlin, Zhang, Anxue, Xu, Zhuo
Format: Article
Language:eng
Subjects:
Apertures
Broadband
Coincidence imaging
Computer simulation
High resolution
Image reconstruction
Image resolution
Imaging
Imaging techniques
Metamaterials
Microwave theory and techniques
Modulation
Radar
Radar imagery
Radar imaging
Radiation
reflective surface
Resolution
resolution analysis
Spatial analysis
Spatial discrimination
spatial modulation
Surface treatment
Synchronism
Synchronization
Target recognition
Viewing
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Description
Summary:The spatial modulation coincidence imaging (SMCI), as a novel kind of microwave coincidence imaging method, is proposed in this paper. The SMCI system provides a new way to produce the time-space independent signal instead of multitransmitter architecture with wideband randomly modulated signal in radar coincidence imaging. Due to some special features, metamaterial plate is utilized as the reflective surface to modulate the incident signal to construct random radiation field. The resolution of SMCI system is analyzed under large viewing angle with two different transmitting signals. Reflective surface is nonuniformly divided to derive the expression of resolution. The analysis results show that the resolution of SMCI system is mainly determined by the size of reflective surface and center frequency, which is similar to the traditional aperture. The SMCI system is low cost and flexible in design. Simultaneously, it can avoid the synchronization problem between subsources. Moreover, the SMCI system can achieve the resolution of space target through single transmitter-single receiver radar system. High-resolution image can be reconstructed since the tests are nonlinear. Finally, a series of simulation experiments is presented based on the nondirect-viewing scene we proposed. Using the algorithm based on a compressed sensing theory, we reconstructed the target image with high resolution.
ISSN:0196-2892
1558-0644