如果符合条件的消息不存在，操作并不会等待消息的出现。它只是简单地用一个新的刷新间隔周期来组装一个刷新响应并将它返回给调用者。
If no message exists, the operation does not wait around for one; it simply prepares another refresh Response with a new refresh interval period and returns that back to the caller.
当噪声中含有微弱的多普勒回波时，通过理论分析可知系统输出为阵发混沌状态，且可根据混沌状态的间隔周期较准确地求出回波信号的多普勒频移。
When there is faint Doppler echo in noise, the system output is intermittent chaotic, and the Doppler shift can be obtained accurately by calculating the interval of chaotic state.
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