On Thursday, the U. S. Navy said Somali pirates opened fire on a Navy helicopter, as it was conducting a surveillance of a captured vessel in central Somalia.
星期四，美国海军说，索马里海盗对一架海军直升机开火，这架直升机当时在索马里中部对一艘被海盗劫持的船只进行监视。
For infrared surveillance system, it is most difficult that the measurements are only angles not distance, which makes target location of fire control system be difficult to realize.
对于红外预警系统，目标定位的最大难点是观测量只有角度，没有距离，这就使得火控系统的目标导引遇到困难。
This proves that the one-dimensional trajectory amendments mode of ground radar surveillance and progroud fire-control center control is entirely feasible and can achieve low-cost and miniaturization.
由此可见，采用地面雷达导航、由地面火控中心发射指令的一维弹道修正方式完全可行，并可以做到低成本，小型化。
This proves that the one-dimensional trajectory amendments mode of ground radar surveillance and progroud fire-control center control is entirely feasible and can achieve low-cost and miniaturization.
由此可见，采用地面雷达导航、由地面火控中心发射指令的一维弹道修正方式完全可行，并可以做到低成本，小型化。
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