TY - JOUR
T1 - IRCI-free MIMO-OFDM SAR using circularly shifted zadoff-chu sequences
AU - Cao, Yun He
AU - Xia, Xiang Gen
N1 - Publisher Copyright:
© 2004-2012 IEEE.
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Cyclic prefix (CP)-based multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) radar has been recently proposed for distributed transmit antennas, where there is no inter-range-cell interference (IRCI). However, it needs to transmit multiple OFDM pulses consecutively to obtain range profiles for a single swath, which may be too long in time for a reasonable swath width. In this letter, we propose a CP-based MIMO-OFDM synthetic aperture radar system, where each transmitter transmits only a single OFDM pulse to obtain range profiles and has the same frequency band; thus, the range resolution is not reduced. It is IRCI free and can collect full spatial diversity if the transmit antennas are distributed. Our main idea is to use circularly shifted Zadoff-Chu sequences as the weighting coefficients in the OFDM waveforms for different transmit antennas and apply spatial filters with multiple receive antennas to divide the whole swath into multiple subswaths, and then, each subswath is reconstructed/imaged using our proposed IRCI-free range reconstruction method.
AB - Cyclic prefix (CP)-based multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) radar has been recently proposed for distributed transmit antennas, where there is no inter-range-cell interference (IRCI). However, it needs to transmit multiple OFDM pulses consecutively to obtain range profiles for a single swath, which may be too long in time for a reasonable swath width. In this letter, we propose a CP-based MIMO-OFDM synthetic aperture radar system, where each transmitter transmits only a single OFDM pulse to obtain range profiles and has the same frequency band; thus, the range resolution is not reduced. It is IRCI free and can collect full spatial diversity if the transmit antennas are distributed. Our main idea is to use circularly shifted Zadoff-Chu sequences as the weighting coefficients in the OFDM waveforms for different transmit antennas and apply spatial filters with multiple receive antennas to divide the whole swath into multiple subswaths, and then, each subswath is reconstructed/imaged using our proposed IRCI-free range reconstruction method.
KW - Circularly shifted Zadoff-Chu sequences
KW - cyclic prefix (CP)
KW - inter-range-cell interference (IRCI) free
KW - multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM)
KW - synthetic aperture radar (SAR)
UR - https://www.scopus.com/pages/publications/85027942953
U2 - 10.1109/LGRS.2014.2385693
DO - 10.1109/LGRS.2014.2385693
M3 - Article
AN - SCOPUS:85027942953
SN - 1545-598X
VL - 12
SP - 1126
EP - 1130
JO - IEEE Geoscience and Remote Sensing Letters
JF - IEEE Geoscience and Remote Sensing Letters
IS - 5
M1 - 7015551
ER -