According to tracking theory, automatic following can be divided into three systems: step-advance tracking, taper-scan tracking and single-pulse tracking.
按跟踪原理，自动跟踪可分为三种体制：步进跟踪、圆锥扫描跟踪和单脉冲跟踪。
According to tracking data collected by the US military, SJ-12 has performed multiple manoeuvres since its launch in June, slowly shifting its orbit to match that of SJ-06F.
通过美军收集的跟踪数据显示，SJ-12自6月发射升空后进行了多次变轨，并逐渐的调整到SJ-06F的轨道上。
As the fleet ages, there's an increasing need for embedded wireless strain sensors capable of detecting and tracking accumulated strains — "precursors" to crack initiation, according to the official.
随着机群服役时间的增加，对嵌入式无线应力传感器的需求也在不断的增加，通过这些传感器对应力积累进行探测和跟踪，避免飞机机体发生可能的疲劳和破裂。
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