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本文分析了分辨力与随机误差的定量关系，并以此为指导选择和设计了超声发射、接收、测时等电路以及数字滤波方法，提高了超声测距的精度和分辨力．
This paper analyzes the quantitative relationship between resolution and random error, and uses it as a guide to select and design ultrasonic transmitting, receiving, measuring circuit and digital filtering methods to improve the accuracy and resolution of ultrasonic ranging.