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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.
研究发现，系统响应具有两条通向混沌的道路，即阵发性通向混沌的道路和拟周期通向混沌的道路。
It is found that there are two routes leading the response to chaos, the intermittence to chaos and quasi-period to ch aos.
由结果发现：响应进入混沌的道路有拟周期环面破裂、周期3运动失稳和阵发性混沌进入混沌三条。
The response results show that there are three ways leading to chaos: quasi-periodic bifurcation, intermittent bifurcation and unstable period-3 motion.
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