Relate a Concept that represents an external object to a service using a user defined relationship.
将表示外部对象的概念与使用用户定义的关系的服务关联起来。
The frequency of the self-mixing interference signal is acquired by time-frequency analysis, and this frequency is equal to the Doppler shift, so the velocity of external object is gained easily.
该方法通过时频分析获得自混合信号频率随时间的变化，利用激光与外部物体相互作用后的多普勒频移与信号频率相等的关系，非常方便的获得了外部运动物体的速度历史信息。
The frequency of the self-mixing interference signal is acquired by time-frequency analysis, and this frequency is equal to the Doppler shift, so the velocity of external object is gained easily.
该方法通过时频分析获得自混合信号频率随时间的变化，利用激光与外部物体相互作用后的多普勒频移与信号频率相等的关系，非常方便的获得了外部运动物体的速度历史信息。
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