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access icon free FMCW multiple-input multiple-output radar with iterative adaptive beamforming

© The Institution of Engineering and Technology
Received 08/02/2018, Accepted 30/05/2018, Revised 24/04/2018, Published 01/08/2018

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.

Inspec keywords: radar signal processing; FM radar; CW radar; frequency modulation; synchronisation; iterative methods; MIMO radar; array signal processing

Other keywords: bandwidth 100 MHz; FMCW radar system; collocated antennas; transmit site; IAA beamforming; remote TX site; remote RX site; cost-efficient systems; iterative adaptive algorithm; low-frequency clock; continuous wave multiple-input multiple-output radar system; FMCW multiple-input multiple-output radar; digital beamforming; radar simulator; frequency 2.4 GHz; trigger distribution system

Subjects: Interpolation and function approximation (numerical analysis); Signal processing and detection; Modulation and coding methods; Radar equipment, systems and applications

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