针对曲线区段的定位，还提出了一种基于GP S方位角和轨道信息的同向切线定位法。
It adopted not only direction information of GPS but also the tangent heading information taken from the database to get actual train position on curve segment.
这一方法被称为“回声定位法”，是一种借助物体产生的回声来识别其方位的方法。
It's called 4 echolocation, a technique that USES sound to identify objects by the echoes they produce.
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