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LOW POWER GPS FOR ITS APPLICATIONS.
| 题名： | LOW POWER GPS FOR ITS APPLICATIONS. |
| 作者： | Gehue-Hazen; Turetzky-Greg |
| 关键词： | Global-Positioning-System; automatic-vehicle-location; energy-consumption; reliability- |
| 摘要： | Intelligent Transportation Systems (ITS) require reliable location information with emphasis being put on sensor level integration and low power consumption. The Global Positioning System (GPS) has been proposed as a potential technology to provide this information but has been hampered by poor performance (in urban environments) and power hungry board level solutions. Increased pressure on in-vehicle sensor power consumption has driven SiRF Technology Inc. to develop the SiRFstar1/LX GPS chip set (GSP1/LX and GRF1/LX). This improved chip set architecture enables low power consumption without sacrificing tracking or navigation performance specifically in difficult urban canyons. Most GPS systems have been designed as stand-alone board level solutions that can be used in high-level system integration. Recent advances in silicon, GPS chipset architecture and software technology have enabled new methods to increase the position density through rapid signal acquisition and GPS solutions in difficult satellite tracking environments using 1or 2 satellites (after valid 3D fix) . Advantage can be taken of in vehicle memory and processors allowing chipset level integration of navigation technology. To ensure that the previously achieved benchmarks for tracking and performance set by the SiRFstarI were not degraded due to lower power versions of the chipset, a test vehicle was used to collect GPS position data under normal traffic conditions in downtown San Francisco (a difficult urban area for signal reception). Testing of the rapid signal reacquisition capability was added via routes that had tunnels followed by quick turns on exit. |
| 总页数： | ITS America. Meeting (8th : 1998 : Detroit, Mich.). Transportation technology for tomorrow : conference proceedings. 1998. pp12 |
| 报告类型： | 科技报告 |
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