Open AccessFMCW multiple‐input multiple‐output radar with iterative adaptive beamforming
Author(s) -
Eckhardt Johannes M.,
Joram Niko,
Figueroa Adrian,
Lindner Bastian,
Ellinger Frank
Publication year - 2018
Publication title -
iet radar, sonar and navigation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.489
H-Index - 82
eISSN - 1751-8792
pISSN - 1751-8784
DOI - 10.1049/iet-rsn.2018.5112
Subject(s) - beamforming , computer science , radar , continuous wave radar , electronic engineering , bandwidth (computing) , adaptive beamformer , engineering , telecommunications , radar imaging
This work presents the design of a frequency modulated continuous wave (FMCW) multiple‐input multiple‐output radar system with collocated antennas. A key part of this article is the modification and application of the iterative adaptive algorithm (IAA) for digital beamforming to an FMCW radar system. The implemented system operates in the 2.4 GHz Industry, Scientific and Medical band with 100 MHz of bandwidth and consists of a transmit (TX) site with four antennas and a receive (RX) site with four antennas. The angular resolution is greatly improved from 15° with the common delay‐and‐sum beamforming to only 5° with IAA beamforming, which was verified by the results from a radar simulator and by a field test with the implemented hardware. The challenge of synchronisation and maintaining phase coherence in systems with remote TX and RX sites is also addressed by proposing a low‐frequency clock and trigger distribution system. This approach allows for cost‐efficient systems which can be distributed over longer distances.