当设备异常或检测装置发出事故信号时，PC按程序进行异常事故显示、报警和处理。
PC will give a unusual accident display, alarming and treatment as programmed in case that the conveyer is out of normal order or any accident occurs in the detecting system.
由于舰船雷达信号目标环境的复杂性，从强杂波中检测目标异常困难。
When the object environment of ship radar signal is complex, detecting object is very difficult.
由于故障发生时系统表现异常，这些异常可导致测量信号分形维数的变化，根据这些变化可进行故障检测。
When the fault appears, there will be some variation in the fractal dimension of measurement signal, and the fault detection can be carried out according to this change.
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