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Efficient use of the expected user altitude data for help in determining the position of the mobile station
Efficient use of the expected user altitude data for help in determining the position of the mobile station
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机译:有效利用预期的用户海拔高度数据来帮助确定移动台的位置
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摘要
PROBLEM TO BE SOLVED: To provide a method of calculating a three-dimensional position of a point to be positioned in a short time by using a terrain database available for a memory of a mobile station having severe capacity limitations.;SOLUTION: An initial position is calculated on the basis of a global coarse altitude estimate and at least three global positioning system satellite measurements. One of databases including only the most populous areas or specific regions is identified on the basis of the initial position, instead of using the entire terrain model of the earth or an entire country as an altitude estimate and a terrain database. This reduces the size of the information in the database, which in turn reduces the amount of time to compute the position of a wireless device.;COPYRIGHT: (C)2015,JPO&INPIT
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