MIMO SAR OFDM Chirp Waveform Diversity Design With Random Matrix Modulation

Multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) has received much attention due to its interesting application potentials, but effective waveform diversity design is still a technical challenge. In a MIMO SAR, each antenna should transmit a unique waveform, orthogonal to the wav...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2015-03, Vol.53 (3), p.1615-1625
Main Author: Wang, Wen-Qin
Format: Article
Language:English
Subjects:
Antennas
Bandwidth
Chirp
Constants
Imaging
MIMO
MIMO SAR
Modulation
multiple-input multiple-output (MIMO)
OFDM
OFDM chirp waveform
Orthogonal Frequency Division Multiplexing
orthogonal frequency division multiplexing (OFDM)
Radar
Synthetic aperture radar
synthetic aperture radar (SAR)
waveform diversity
Waveforms
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Summary:Multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) has received much attention due to its interesting application potentials, but effective waveform diversity design is still a technical challenge. In a MIMO SAR, each antenna should transmit a unique waveform, orthogonal to the waveforms transmitted by other antennas. The waveforms should have a large time-bandwidth product, low cross-correlation interferences, and a low peak-average ratio. To reach these aims, this paper proposes an orthogonal frequency division multiplexing (OFDM) chirp waveform with random matrix modulation. The designed waveforms are time-delay and frequency-shift decorrelated. Referring to MIMO SAR high-resolution imaging, the proposed OFDM chirp waveform parameters are optimally designed, and their performances are analyzed through the ambiguity function and range-Doppler-based MIMO SAR imaging algorithm. Extensive and comparative simulation results show that the waveforms have the superiorities of high range resolution, constant time domain and almost constant frequency-domain modulus, large time-bandwidth product, low peak-average ratio, and low time-delay and frequency-shift correlation peaks. More importantly, this scheme can easily generate over three orthogonal waveforms with a large time-bandwidth product.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2014.2346478