MIMO SAR OFDM Chirp Waveform Diversity Design With Random Matrix Modulation

• Published in: IEEE transactions on geoscience and remote sensing Vol. 53; no. 3; pp. 1615 - 1625
• Main Author: Wang, Wen-Qin
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-03-2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• 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; waveform diversity; OFDM chirp waveform; multiple-input multiple-output (MIMO); orthogonal frequency division multiplexing (OFDM); synthetic aperture radar (SAR); MIMO SAR
• ISSN: 0196-2892; 1558-0644
• DOI: 10.1109/TGRS.2014.2346478

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.