3、1 基准系(Datum)实体集 数据库中对定位参照方法的描述叫定位参照系统(Location Reference System,LERS)。
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linear reference location system 线性定位参照系
location reference system
位置参考系统
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"Our biggest challenges were developing an algorithm which optimally combines the data from GPS and the other sensors, and overcoming the issues of using such low-cost sensors in a system without any absolute location reference, " said Smithson.
ENGADGET: Cambridge Consultants develops indoor tech to pick up where GPS drops off
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