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原文传递 GPS ANTENNA PLACEMENT ANALYSIS IN AN AUTOMOBILE SIMULATION AND PERFORMANCE TEST RESULTS.

题名：	GPS ANTENNA PLACEMENT ANALYSIS IN AN AUTOMOBILE SIMULATION AND PERFORMANCE TEST RESULTS.
作者：	Bullock-JB
关键词：	GLOBAL-POSITIONING-SYSTEMS; ANTENNAS-; PLACEMENT-; AUTOMOBILES-; SIMULATIONS-; PERFORMANCE-TESTS; INTELLIGENT-TRANSPORTATION-SYSTEMS; LINE-OF-SIGHT; PASSENGER-COMPARTMENTS; ANGLES-; GLASS-; DUAL-
摘要：	Global Positioning System (GPS) receivers are used extensively in Intelligent Transportation Systems (ITS) for positioning and navigation. Positions derived from GPS receivers are the key pieces of information in emergency location systems, theft recovery systems, vehicle tracking systems and in-vehicle navigation systems. GPS receivers use L-band signals from orbiting satellites to compute the three-dimensional (3D) position and the velocity vector components of the vehicle platform. The signals are line-of-sight and are blocked by metal and other materials, so proper antenna placement on a vehicle is critical for optimum performance. GPS antennas are relatively small, so there are many possible locations for mounting them on a vehicle. In some cases, multiple antennas may be required for added safety and security. The trend for vehicle mounted GPS antennas is to mount them in discreet or hidden locations to prevent detection and/or theft. Ease of installation and servicing is also an important consideration when selecting a location for the GPS antenna to be installed. This paper investigates the performance implications of mounting GPS antennas in the passenger compartment of a vehicle. The reduced coverage due to reduced satellite visibility is evaluated. The benefit of a dual antenna system is considered. The effect of antenna placement on dilution of precision (DOP) measures and satellite availability is analyzed. The analysis is based on simulated satellite alert data and actual road test data recorded in both forested and urban canyon areas. The results of the analysis show that mounting the GPS antenna on or under the front dashboard or on or under the rear package shelf has minimal impact on the overall availability and accuracy of GPS positions. For both locations, the angle of the glass is the most significant factor in the performance. There is little or no benefit from having antennas mounted in both locations.
总页数：	Conference Title: Merging the Transportation and Communications Revolutions. Abstracts for ITS America Seventh Annual Meeting and Exposition. Location: Washington, D.C. Sponsored by: ITS America. Held: 19970602-19970605. 1997. pp33
报告类型：	科技报告