Polarimetric characterization of debris and faults in the highway environment at millimeter-wave frequencies

Citation
K. Sarabandi et Es. Li, Polarimetric characterization of debris and faults in the highway environment at millimeter-wave frequencies, IEEE ANTENN, 48(11), 2000, pp. 1756-1768
Citations number
10
Categorie Soggetti
Information Tecnology & Communication Systems
Journal title
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
ISSN journal
0018926X → ACNP
Volume
48
Issue
11
Year of publication
2000
Pages
1756 - 1768
Database
ISI
SICI code
0018-926X(200011)48:11<1756:PCODAF>2.0.ZU;2-E
Abstract
In this paper, measurements and models for the polarimetric backscatter res ponse of various point targets on roads and road surface faults is presente d. Of particular interest are debris and faults that could lead to fatal ac cidents and damage of property. A desired safety feature for automotive rad ar sensors is the capability of detecting such debris and faults. The detec tability of a point target is evaluated by comparing its RCS value with the RCS threshold value defined by the backscatter response of the road surfac e. Extensive backscatter measurements at W-band were conducted to obtain th e backscatter response of typical debris and faults on asphalt surfaces at near grazing incidence angles (76 degrees -86 degrees). On the other hand, theoretical models, based on diffraction from impedance wedges and scatteri ng from impedance cylinders, respectively, as well as physical optics appro ximation, were developed to predict the backscatter response of road surfac e faults and targets with planar facets on road surfaces. Experimental resu lts indicate that detectability in all cases is a function of target size, its azimuthal angle with respect to radar boresight, and the polarization s tate of the system. The measured backscatter response is used to verify the validity of the theoretical models. Angular polarimetric backscatter measu rements of targets defining roadside boundaries such as a concrete curb, a guardrail, and a pebble surface are also presented. The results of these me asurements could be used to alert fatigued drivers should their vehicles be heading sideward.