continuous wave modulation

Despite the advantage of high average power output , a wide bandwidth ultrasonic transducer is needed in the ultrasonic ranging system with traditional continuous wave frequency modulation . But the transducer with wide bandwidth is not commonly available .

传统的连续调频超声波系统尽管具有平均输出功率高的优点，却需要使用宽带超声波传感器。

Distance measurement with an ultrasonic ranging system based on continuous wave narrow bandwidth frequency modulation

连续窄带调频超声波测距方法