步进电机是一种数字控制电机，它将脉冲信号转变成角位移，电机的转速由脉冲信号频率决定。
Stepper motor is a motor controlled by digital signal, which converts pulse signal into Angle displacement. The wheeling speed is controlled by the frequency of pulse signal.
测速传感器选用步进电机测速形式，测速传感器向秤重仪表发出系列脉冲信号，每个脉冲代表皮带行程的一个单位，脉冲频率和皮带速度成正比。
Choose stepping motor speed sensor speed form, to speed sensor weighed instrument issued a series of pulses, Each pulse represents one of the units.
现代雷达为获得较高的距离分辨力通常采用编码频率脉冲串信号和步进频率脉冲串信号，但都存在数据率低和较为严重的距离-多普勒耦合问题。
But these signal problems of range-Doppler coupling and low data ratio are still not solved completely although some encouraging results have been obtained and applied in the radar system design.
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