【正文】 器的研究現(xiàn)狀，理解各種測距原理，了解超聲波的相關(guān)知識。（2）完成了系統(tǒng)的總體設(shè)計以及硬件電路設(shè)計。（3）完成了超聲波測距雷達軟件設(shè)計，并且調(diào)試通過，基本實現(xiàn)了系統(tǒng)的設(shè)計目標，最終完成程序燒錄。（4）對所做出的產(chǎn)品進行性能測試，精度達到預定要求。本系統(tǒng)設(shè)計過程中，由于時間和能力等多方面的原因，本系統(tǒng)還存在一些不足之處，有待進一步改進和提高。主要包括:（1）在遠距離測量時，驅(qū)動功率相對不夠。測量距離較近，測量距離較大時，顯示的數(shù)據(jù)就會有較大的誤差。（2）由于時間關(guān)系，對于溫濕度對電路的影響本設(shè)計都沒有做考慮。包括溫度對聲速的影響由于時間和技術(shù)原因未能設(shè)計出來。致 謝首先，我要感謝我的導師張煥君在畢業(yè)設(shè)計中對我給予的悉心指導和嚴格要求，同時也感謝本校的一些老師在畢業(yè)設(shè)計期間所給予我得幫助。在我畢業(yè)論文寫作期間，各位老師給我提供了種種專業(yè)知識上的指導和日常生活上的關(guān)懷，沒有您們這樣的幫助和關(guān)懷，我不會這么順利的完成畢業(yè)設(shè)計，借此機會向您們表示由衷的感激。在畢業(yè)設(shè)計的短短3個月里，老師給我提出很多寶貴的意見，給了我不少幫助還有工作上的支持，在此也真誠的謝謝你們。同時，我還要感謝我的寢室同學和身邊的朋友，正是在這樣一個團結(jié)友愛、相互促進的環(huán)境中，在和他們的相互幫助和啟發(fā)中，才有我今天的小小收獲。最后我要深深地感謝我的家人，正是他們含辛茹苦地把我養(yǎng)育成人，在生活和學習上給予我無盡的愛、理解和支持，才使我時刻充滿信心和勇氣，克服成長路上的種種困難，順利的完成大學學習。還有許許多多給予我學業(yè)上鼓勵和幫助的朋友，在此無法一一列舉，在此也一并表示忠心地感謝！參考文獻[1] 李勇.《車載單片機與車載網(wǎng)絡(luò)技術(shù)》.，2011年：P57[2] 王懿川.《基于單片機控制的超聲波測距報警系統(tǒng)》.上海計量測試 ， 2011年第5期：P45~P47[3] 陳明計.《單片機應用設(shè)計基礎(chǔ)》. ， 2011年：P89~P90[4] 胡佳文.《51系列單片機原理及設(shè)計實例》.北京航空航天大學出版社， 2010年：P79[5] 周潤景.《單片機設(shè)計分析與制作》.機械工業(yè)出版社 ，2010年：P123~P124[6] 陳濤 .《單片機應用及C51程序設(shè)計》.第二版. 機械工業(yè)出版社 ， 2010年：P93[7] 龔運新.《單片機接口C語言開發(fā)技術(shù)》. ，2009年：P234~P235附錄A英文文獻Ultrasonic ranging system designPublication title: Sensor Review. Bradford: 1993. Vol. 13ABSTRACT：Ultrasonic ranging technology has wide using worth in many fields，such as the industrial locale，vehicle navigation and sonar engineering．Now it has been used in level measurement，selfguided autonomous vehicles, fieldwork robots automotive navigation，air and underwater target detection，identification，location and so on．So there is an important practicing meaning to learn the ranging theory and ways deeply. To improve the precision of the ultrasonic ranging system in hand，satisfy the request of the engineering personnel for the ranging precision，the bound and the usage，a portable ultrasonic ranging system based on the single chip processor was developed．Keywords：Ultrasound r，Ranging System，Single Chip Processor1 IntroductiveWith the development of science and technology, the improvement of people39。s standard of living, speeding up the development and construction of the city. urban drainage system have greatly developed their situation is constantly improving. However, due to historical reasons many unpredictable factors in the synthesis of her time, the city drainage system. In particular drainage system often lags behind urban construction. Therefore, there are often good building excavation has been building facilities to upgrade the drainage system phenomenon. It brought to the city sewage, and it is clear to the city sewage and drainage culvert in the sewage treatment system. fort is very important to people39。s lives. Mobile robots designed to clear the drainage culvert and the automatic control system Free sewage culvert clear guarantee robot, the robot is designed to clear the culvert sewage to the core. Control System is the core ponent of the development of ultrasonic range finder. Therefore, it is very important to design a good ultrasonic range finder.2 A principle of ultrasonic distance measurement The principle of piezoelectric ultrasonic generator Piezoelectric ultrasonic generator is the use of piezoelectric crystal resonators to work. Ultrasonic generator, the internal structure as shown, it has two piezoelectric chip and a resonance plate. When it39。s two plus pulse signal, the frequency equal to the intrinsic piezoelectric oscillation frequency chip, the chip will happen piezoelectric resonance, and promote the development of plate vibration resonance, ultrasound is generated. Conversely, if the two are not interelectrode voltage, when the board received ultrasonic resonance, it will be for vibration suppression of piezoelectric chip, the mechanical energy is converted to electrical signals, then it bees the ultrasonic receiver. The traditional way to determine the moment of the echo39。s arrival is based on thresholding the received signal with a fixed reference. The threshold is chosen well above the noise level, whereas the moment of arrival of an echo is defined as the first moment the echo signal surpasses that threshold. The intensity of an echo reflecting from an object strongly depends on the object39。s nature, size and distance from the sensor. Further, the time interval from the echo39。s starting point to the moment when it surpasses the threshold changes with the intensity of the echo. As a consequence, a considerable error may occur Even two echoes with different intensities arriving exactly at the same time will surpass the threshold at different moments. The stronger one will surpass t