文章讨论了各种超声图像伪像形成的原因，并在此基础上从声波的传播角度，对超声伪像给出了新的认识，提出了一些控制方法。
The article puts great emphasis on the reasons of ultrasound image artifacts, discusses the image artifacts caused by complicated interface and presents a new view on ultrasound image artifacts.
为了解决上述问题，我们研制了基于伪随机码调制的超声波测距。
In order to solve the above problems, we develop ultrasonic range-finder which is based on pseudorandom code.
分析了伪随机码的相关特性，讨论了基于伪码相关技术的超声波液位测量原理，设计并完成了液位测量系统。
The relative characteristics of the pseudo code are analyzed. With discussion on the principle ol ultrasonic level measurement based on pseudo code technology, the level measuring system is designed.
本文将伪随机码应用于超声波测距中，解决了超声波测距中存在的测距精度低和测量距离近的问题。
PRBS is applied in ultrasonic distance measurement in this article, which resolves some problems existing in it.
本文将伪随机码应用于超声波测距中，解决了超声波测距中存在的测距精度低和测量距离近的问题。
PRBS is applied in ultrasonic distance measurement in this article, which resolves some problems existing in it.
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