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W-Band FMCW MIMO radar demonstrator system for 3D imaging

 
: Bleh, Daniela Karina
: Paul, Oliver; Ambacher, Oliver; Yang, Bin

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Fulltext urn:nbn:de:0011-n-4842744 (32 MByte PDF)
MD5 Fingerprint: 79964f4ef92d6f1424c4a18c5cf5b2c7
Created on: 09.02.2019

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Stuttgart: Fraunhofer Verlag, 2018, II, 111 pp.
Zugl.: Freiburg, Univ., Diss., 2017
Science for systems, 34
ISBN: 978-3-8396-1254-5
English
Dissertation, Electronic Publication
Fraunhofer IAF ()
Engineering: general; parallel processing; signal processing; MIMO radar; millimeter wave; 3D imaging; radar system; Elektrotechnik-Ingenieur; angewandte Physiker

Abstract
One of the most dangerous situations when flying a helicopter is landing over dry sand or powder snow. The rotors swirl particles creating a dense cloud. With optical methods navigating through this cloud is impossible but for millimetre waves it becomes almost transparent. As a consequence millimetre waves are an outstanding choice for the development of imaging systems that can be used as a landing aid. The aim of this work is the 3D imaging of static scenes with a large field of view, good resolution and high dynamics. In this thesis a demonstrator system is presented, which is based on the MIMO principle and works with FMCW radar modules in the millimetre wavelength range. The set-up of the demonstrator system is explained and the hardware components are described. An algorithm for image reconstruction is presented as well as a calibration routine. An optimized antenne aperture is determined that enables unambiguous imaging of the half-space in front of the aperture with good resolution and low side lobes. Various measurements illustrate three-dimensional imaging capabilities and show long-range operation. In addition, the data acquisition rate is determined.

: http://publica.fraunhofer.de/documents/N-484274.html