The interval is measured in minutes, with the difference between _LastUpdated and the current time measured in milliseconds.
interval 用分钟计量，而 _LastUpdated 和当前时间的差以毫秒计算。
According to calculate method, the paper analyzed the influencing factors about heterogeneity, including velocity difference, proportion difference, interval length, buffer time.
以异质性计算模型为依据，分析运行图异质性的影响因素，包括不同速度差、不同列车比例、区间长度、天窗类型、缓冲时间等。
The TOA algorithm is used to obtain the time measuring values required in the location procedure and thus obtain the difference of interval of each beacon achieved.
用TOA法获得定位中需要的时间测量值，从而得到各信标台的距离差；
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