Analysis of GPS and Loran-C performance for land vehicle navigation in the Canadian Rockies

IEEE PLANS 92 Position Location and Navigation Symposium Record Pub Date : 1900-01-01 DOI:10.1109/PLANS.1992.185894

G. Lachapelle, B. Townsend, D. Halayko

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Abstract

Loran-C and GPS (Global Positioning System) were assessed for vehicular navigation along selected roads of British Columbia during the winter of 1991. The general topography of this mountainous area is described, together with the specific topographic features and tree coverage characteristics of the 2000 km of roads tested on the mainland and on Vancouver Island. The configuration and characteristics of the Loran-C Canadian West Coast chain along the roads used are described. The portable vehicle-mounted LORCAL (Loran Calibration at the University of Calgary) system used to collect and analyze the Loran-C and GPS signals along road profiles is described. The performance of Loran-C is analyzed in terms of signal to noise ratios, field strength, and time difference distortions, as measured by differential GPS. These distortions, which can reach several hundred meters over distances of less than 20 km, are analyzed in terms of topographic features. The possibility of using these time-independent distortions to calibrate Loran-C for use along the above roads is discussed. Masking of GPS signals due to topographic features and tree coverage along the roads is analyzed. A comparative analysis of Loran-C and GPS is presented in terms of signal availability and accuracy.<>

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GPS和Loran-C在加拿大落基山脉的陆地车辆导航性能分析

1991年冬季，对Loran-C和GPS(全球定位系统)在不列颠哥伦比亚省选定道路上的车辆导航进行了评估。描述了该山区的一般地形，以及在大陆和温哥华岛测试的2000公里道路的具体地形特征和树木覆盖特征。介绍了Loran-C加拿大西海岸链条沿线道路的配置和特点。介绍了一种便携式车载LORCAL(卡尔加里大学Loran校准)系统，用于收集和分析道路轮廓线上的Loran- c和GPS信号。从信噪比、场强和时差畸变等方面分析了Loran-C的性能。这些变形在不到20公里的距离上可以达到几百米，根据地形特征进行分析。讨论了使用这些时间无关的扭曲来校准Loran-C用于上述道路的可能性。分析了地形特征和道路沿线树木覆盖对GPS信号的掩蔽。从信号可用性和精度两方面对Loran-C和GPS进行了比较分析

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IEEE PLANS 92 Position Location and Navigation Symposium Record

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