This example USES a predefined "ping" Nagios plug-in, which sends Internet Control Message Protocol (ICMP) echo requests to determine if a host is responsive or not.
这个示例使用了一个预定义的“ping”Nagios插件，它将发送Internet控制信息协议(Internet Control Message Protocol, ICMP)回显请求以确定主机是否有响应。
So, it requests radar provided with the ability to restrain clutter wave for differentiating the echo of moving target.
因此要求雷达必须具备很强的抑制杂波的能力，能在较强的杂波背景中分辨出运动目标的回波。
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