A W-band multiple-input multiple-output (MIMO) radar imaging system has been proposed. The 4 × 4 radar system that forms a 2-D virtual array operates at a center frequency of 94 GHz and bandwidth of 1 GHz with frequency-modulated continuous wave. A hybrid scheme comprising time- and frequency-division multiplexing is introduced for establishing orthogonal waveforms, where the transmit channels perform alternate transmission in pairs. The proposed scheme can efficiently extend the number of MIMO channels utilizing the existing hardware with simultaneous transmission. The design, implementation, measurements, and imaging results of the proposed radar system have been presented. The imaging performance was tested through outdoor experiments. The high-resolution performance was shown with images generated using a synthetic aperture radar. The impulse responses of all channels were measured, and the resolution was confirmed to be 0.15 m in all the channels. In addition, a human and a car at 100-m range were imaged using the proposed radar system. The polarimetric and interferometric capabilities were tested for multimode imaging with the MIMO configuration. Overall, the measurements and experimental results verified the feasibility of the proposed MIMO radar with hybrid scheme as a high-resolution multimode imaging system.
|Number of pages||16|
|Journal||IEEE Transactions on Geoscience and Remote Sensing|
|Publication status||Published - 2020 Jul|
Bibliographical noteFunding Information:
Manuscript received January 4, 2019; revised April 11, 2019 and November 24, 2019; accepted December 29, 2019. Date of publication February 20, 2020; date of current version June 24, 2020. This work was supported in part by the Ministry of Science and ICT (MSIT), South Korea, through the ICT Consilience Creative Program supervised by the Institute for Information & Communications Technology Promotion (IITP) under Grant IITP-2018-2017-0-01015, and in part by the Korea Government (MSIT) through an IITP Grant (A Development of SAR for Small Sized UAV) under Grant 2017-0-00678. (Corresponding author: Min-Ho Ka.) Se-Yeon Jeon was with the School of Integrated Technology, Yonsei Institute of Convergence Technology, Yonsei University, Seoul 21983, South Korea. She is now with the German Aerospace Center, Microwaves and Radar Institute, Oberpfaffenhofen 82234, Germany (e-mail: email@example.com).
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering
- Earth and Planetary Sciences(all)