Antenna Beamwidths of Above-The-Road Radar for Traffic Speed Enforcement in China
Above-The-Road (AbTR) radar is a new type of speed measurement device used in China for traffic speed enforcement. The antenna beamwidths in vertical and horizontal directions are critical parameters for AbTR radar because speed measurement accuracy partly depends on vertical beamwidth and speed mea...
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Hindawi Limited
2012-01-01
|
Series: | International Journal of Antennas and Propagation |
Online Access: | http://dx.doi.org/10.1155/2012/492326 |
id |
doaj-6c31f2e162864caa9f41b3a549b034c5 |
---|---|
record_format |
Article |
spelling |
doaj-6c31f2e162864caa9f41b3a549b034c52020-11-25T00:03:34ZengHindawi LimitedInternational Journal of Antennas and Propagation1687-58691687-58772012-01-01201210.1155/2012/492326492326Antenna Beamwidths of Above-The-Road Radar for Traffic Speed Enforcement in ChinaLei Du0Qiao Sun1Changqing Cai2Yue Zhang3Hongbo Hu4Division of Mechanics and Acoustics, National Institute of Metrology, Beijing 100013, ChinaDivision of Mechanics and Acoustics, National Institute of Metrology, Beijing 100013, ChinaDivision of Mechanics and Acoustics, National Institute of Metrology, Beijing 100013, ChinaDivision of Mechanics and Acoustics, National Institute of Metrology, Beijing 100013, ChinaDivision of Mechanics and Acoustics, National Institute of Metrology, Beijing 100013, ChinaAbove-The-Road (AbTR) radar is a new type of speed measurement device used in China for traffic speed enforcement. The antenna beamwidths in vertical and horizontal directions are critical parameters for AbTR radar because speed measurement accuracy partly depends on vertical beamwidth and speed measurement interference from adjacent lanes can be effectively minimized by appropriate choice of horizontal beamwidth. In this paper, the speed measurement principle of AbTR radar is introduced and the reason for field speed measurement error is presented. The speed measurement error is theoretically calculated in various combinations of different vertical beamwidths and possible installation angles. The requirement for horizontal beamwidth to operate with less interference from adjacent lanes is also theoretically laid down with different installation heights and angles. Field tests with three equal-distanced piezosensors each lane as triggering references have been performed on an AbTR radar sample with vertical beamwidth 5.1° and horizontal beamwidth 5.2°. The results of theoretical analysis and field tests validate that the requirement of less than 6° for AbTR radar antenna beamwidths in vertical and horizontal directions is a precondition for accurate and reliable field measurements, which has been added to the China’s pattern approval regulation for AbTR radar devices newly published.http://dx.doi.org/10.1155/2012/492326 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lei Du Qiao Sun Changqing Cai Yue Zhang Hongbo Hu |
spellingShingle |
Lei Du Qiao Sun Changqing Cai Yue Zhang Hongbo Hu Antenna Beamwidths of Above-The-Road Radar for Traffic Speed Enforcement in China International Journal of Antennas and Propagation |
author_facet |
Lei Du Qiao Sun Changqing Cai Yue Zhang Hongbo Hu |
author_sort |
Lei Du |
title |
Antenna Beamwidths of Above-The-Road Radar for Traffic Speed Enforcement in China |
title_short |
Antenna Beamwidths of Above-The-Road Radar for Traffic Speed Enforcement in China |
title_full |
Antenna Beamwidths of Above-The-Road Radar for Traffic Speed Enforcement in China |
title_fullStr |
Antenna Beamwidths of Above-The-Road Radar for Traffic Speed Enforcement in China |
title_full_unstemmed |
Antenna Beamwidths of Above-The-Road Radar for Traffic Speed Enforcement in China |
title_sort |
antenna beamwidths of above-the-road radar for traffic speed enforcement in china |
publisher |
Hindawi Limited |
series |
International Journal of Antennas and Propagation |
issn |
1687-5869 1687-5877 |
publishDate |
2012-01-01 |
description |
Above-The-Road (AbTR) radar is a new type of speed measurement device used in China for traffic speed enforcement. The antenna beamwidths in vertical and horizontal directions are critical parameters for AbTR radar because speed measurement accuracy partly depends on vertical beamwidth and speed measurement interference from adjacent lanes can be effectively minimized by appropriate choice of horizontal beamwidth. In this paper, the speed measurement principle of AbTR radar is introduced and the reason for field speed measurement error is presented. The speed measurement error is theoretically calculated in various combinations of different vertical beamwidths and possible installation angles. The requirement for horizontal beamwidth to operate with less interference from adjacent lanes is also theoretically laid down with different installation heights and angles. Field tests with three equal-distanced piezosensors each lane as triggering references have been performed on an AbTR radar sample with vertical beamwidth 5.1° and horizontal beamwidth 5.2°. The results of theoretical analysis and field tests validate that the requirement of less than 6° for AbTR radar antenna beamwidths in vertical and horizontal directions is a precondition for accurate and reliable field measurements, which has been added to the China’s pattern approval regulation for AbTR radar devices newly published. |
url |
http://dx.doi.org/10.1155/2012/492326 |
work_keys_str_mv |
AT leidu antennabeamwidthsofabovetheroadradarfortrafficspeedenforcementinchina AT qiaosun antennabeamwidthsofabovetheroadradarfortrafficspeedenforcementinchina AT changqingcai antennabeamwidthsofabovetheroadradarfortrafficspeedenforcementinchina AT yuezhang antennabeamwidthsofabovetheroadradarfortrafficspeedenforcementinchina AT hongbohu antennabeamwidthsofabovetheroadradarfortrafficspeedenforcementinchina |
_version_ |
1725433222238568448 |