汽車導(dǎo)航外文翻譯中英--汽車導(dǎo)航系統(tǒng)-其他專業(yè)(存儲(chǔ)版)
【正文】 eter can be used for greater reliability, as GPS signal loss and/or multipath can occur due to urban canyons or tunnels. Some sorts can be taken out of the car and used handheld while walking. History Automotive navigation systems were the subject of extensive experimentation, including some efforts to reach mass markets, prior to the availability of mercialGPS. Most major technologies required for modern automobile navigation were already established when the microprocessor emerged in the 1970s to support their integration and enhancement by puter software. These technologies subsequently underwent extensive refinement, and a variety of system architectures had been explored by the time practical systems reached the market in the late 1980s. Among the other enhancements of the 1980s was the development of color displays for digital maps and of CDROMs for digital map storage. However, there is some question about who made the first mercially available automotive navigation system. There seems to be little room for doubt that Etak was first to make available a digital system that used mapmatching to improve on dead reckoning instrumentation. Etak39。s analog effort with a truly practical digital system, albeit one whose effective range of operation was limited by the availability of appropriately digitized street map data. Technology Visualization Navigation systems may (or may not) use a bination of any of the following: ? top view for the map ? top view for the map with the map rotating with the automobile (so that up on the map always corresponds to forward in the vehicle) ? bird39。一些種類可以從汽車上拿下來，走路時(shí)拿在手中使用。然而 ,日本 對
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