PRISM: An In-Vehicle CPU-Oriented Novel Azimuth Estimation Technique for Electronic-Scan 76-GHz Adaptive-Cruise-Control Radar System

In this paper, we have developed a novel azimuth- estimation technique for 76-GHz adaptive-cruise-control radar systems. To resolve the rank deficiency of the signal covariance matrix and to decrease the influence of dominant noise components, we used an improved SS technique. To balance computation...

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Bibliographic Details
Published in:IEEE transactions on intelligent transportation systems 2008-09, Vol.9 (3), p.451-462
Main Author: Shirakawa, K.
Format: Article
Language:English
Subjects:
Azimuth
Baseband
Computational efficiency
Covariance matrix
Electronic scan (e-scan)
Estimating
Frequency
frequency-modulated continuous wave (FMCW)
Intelligent transportation systems
Kernel
Kernels
Mathematical models
millimeter wave
Millimeter wave radar
Prisms
Projection
Radar
Radar cross section
Radar systems
Signal resolution
Studies
target detection
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Summary:In this paper, we have developed a novel azimuth- estimation technique for 76-GHz adaptive-cruise-control radar systems. To resolve the rank deficiency of the signal covariance matrix and to decrease the influence of dominant noise components, we used an improved SS technique. To balance computational cost with azimuth resolution for in-vehicle implementation, we introduced a projection matrix kernel, which formally is similar to that of beamforming (BF) and semantically similar to that of the propagator method. Our technique is called the PRopagator method based on an improved spatial-smoothing matrix (PRISM). Incorrectly estimating the number of targets causes the conventional BF, subspace-based (SB), or maximum- likelihood methods to produce many false spectrum peaks on the relative azimuth-to-distance plane. We omitted the process of estimating the number of targets, which requires high computational power, because our projection matrix kernel strongly suppresses these false peaks. We conducted numerical experiments using an electronic-scan radar system to examine the performance of PRISM. Compared to conventional SB methods, PRISM requires SNRs that are 2-3 dB higher but has competitive azimuth resolution at a centesimal fraction of the computational cost.
ISSN:1524-9050
1558-0016
DOI:10.1109/TITS.2008.922979