echo principle meaning in English

回声原理

The system is based on ultrasonic multiple pulse - echo principle , the control circuit of sonic circulation , can improve the precision of measurement by extending the time of detection
本系统以超声波多次脉冲反射法测距原理为基础，设计声循环反射控制电路，达到以延长测量时间为代价提高测量精度的目的。
The phase stationary principles ( psp ) and the paired echo principles ( pep ) are firstly reviewed . the error tolerable levels and the error budget are secondly determined . system error model is introduced to analyze the effects of various error sources
利用驻定相位原理和成对回波理论，分析了系统幅相误差的影响；建立了uwbr系统误差模型；提出了uwbr系统误差补偿的新方法并成功应用于实际uwbr系统。
Therefore , it is necessary for guaranteeing the quality of steel plate to detect and repair the roll profile timely and exactly . this paper presents the sonic circulation and multi - pulse echo principle and designs roll profile ultrasonic measurement system based on the analysis of 3d surface measurement technology and roll profile measurement methods
本文在分析了三维面型检测的发展现状及目前辊型的检测方法的基础上，提出了声循环多次脉冲反射测量原理，并以此为基础设计了上位机化的超声波辊型测量系统。