求英语达人帮忙翻译

求达人帮忙翻译下面这个短文，当然要求翻译的精准度啦。谢谢~

 

超声波测距系统的研究与设计

摘要

超声波测距技术在社会生活中己有广泛的应用，如汽车倒车雷达等，它们测距精度一般较低。目前对超声波高精度测距系统的需求越来越大。为此，本文在了解超声波测距原理的基础上，完成了基于时差测距原理的一种超声波测距系统的硬件设计，其中提出采用单片机外部扩展的计数电路可升高计数参考频率，来提高系统的测距精度。为了进一步提高系统测量精度和系统稳定性，在硬件上增加了温度传感器，采取声速预置和媒质温度测量相结合的办法对声速进行修正，降低了温度变化对测距精度的影响;同时采用CPLD芯片来完成计数功能，从而提高了系统计时的可靠性。

关键字:超声波，距离测量。

 

 

上面这些~

 

Ultrasonic Ranging System Study and Design
Summary

Ultrasonic Ranging in social life has a wide range of applications such as car reversing radar, they are generally low ranging accuracy. High-precision ultrasonic ranging system currently growing demand. This paper to understand the principle of ultrasonic distance measurement based on the time difference ranging is completed based on the principle of an ultrasonic ranging system hardware design, which make use of the extended counting circuit external microcontroller can count higher reference frequency, to improve system ranging accuracy. To further improve system accuracy and system stability, an increase in temperature sensor hardware to take pre-and medium temperature measurement speed of sound method of combining an amendment to the speed of sound, reducing the temperature effect on measurement accuracy; while using CPLD chip to complete the counting function, thereby enhancing the reliability of the system timing.

Ultrasonic Ranging System Study and Design
Summary

Ultrasonic Ranging in social life has a wide range of applications such as car reversing radar, they are generally low ranging accuracy. High-precision ultrasonic ranging system currently growing demand. This paper to understand the principle of ultrasonic distance measurement based on the time difference ranging is completed based on the principle of an ultrasonic ranging system hardware design, which make use of the extended counting circuit external microcontroller can count higher reference frequency, to improve system ranging accuracy. To further improve system accuracy and system stability, an increase in temperature sensor hardware to take pre-and medium temperature measurement speed of sound method of combining an amendment to the speed of sound, reducing the temperature effect on measurement accuracy; while using CPLD chip to complete the counting function, thereby enhancing the reliability of the system timing.

Ultrasonic ranging system research and design the

Ultrasonic technology in social life has wide application back-draft radar, such as automobile, etc, they are generally low ranging accuracy. Now precision is improved system of ultrasonic needs more and more. Therefore, based on the understanding of the basis of the principle of ultrasonic ranging, based on the principle of a jet distance ultrasonic ranging system hardware design, which puts the one-chip computer external expansion circuit can count rise, to improve the frequency of reference counting the ranging accuracy system. In order to further improve measurement accuracy and stability of the system, hardware increased temperature sensor, preset and medium temperature measurement sound velocity of sound the way of combination of modified, reduce the temperature change of the influence of the ranging accuracy, At the same time CPLD chip to complete count function, thus improving the reliability of the system clock.

Key words: ultrasonic distance measurement.