Design of Pulse Characteristics for Near-Field UWB-SAR Imaging

In this paper, the design of pulse characteristics to achieve the desired image resolution for near-field synthetic aperture radar is presented. Gaussian and chirp pulses, which are the most commonly used pulses for ultra-wideband (UWB) radar applications, are considered in this paper. The effect of...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2016-08, Vol.64 (8), p.2684-2693
Main Authors: Oloumi, Daniel, Jui-Wen Ting, Rambabu, Karumudi
Format: Article
Language:English
Subjects:
Bandwidth
Chirp
Digital cameras
Envelope detection
Filtering
Filtration
Gaussian
Image resolution
Mathematical analysis
Radar image resolution
Radar imaging
range and cross-range resolution
Sensors
Signal to noise ratio
Synthetic aperture radar
synthetic aperture radar (SAR)
ultra-wideband (UWB) radar
Wideband communications
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Summary:In this paper, the design of pulse characteristics to achieve the desired image resolution for near-field synthetic aperture radar is presented. Gaussian and chirp pulses, which are the most commonly used pulses for ultra-wideband (UWB) radar applications, are considered in this paper. The effect of the pulse shape, bandwidth, integration angle, and signal-to-noise ratio (SNR) of the received pulse on the image resolution is comprehensively studied. To enhance the image resolution, preprocessing of the received pulses with envelope detection or match filtering are also studied. The range and cross-range resolutions achieved by Gaussian and chirp pulses with the same center frequency and bandwidth at various SNR values are compared. This paper shows that the Gaussian pulse with envelope detection provides better image resolution, whereas the chirp pulse with match filtering provides more resistance to noise. Closed-form equations and design guidelines are developed to design the input pulse characteristics to achieve the desired image resolution. The antennas' effect on UWB pulses and the developed equation for cross-range resolution, are both validated using full-wave simulations and measurements.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2016.2585484