【正文】 蝙蝠在黑夜里高速飛行而不會與任何障礙物相撞的原理設(shè)計開發(fā)的。由于這類裝置的價錢較高，目前還沒有普及。這種裝置價格便宜且使用方便，缺點(diǎn)是只能對車后的行人起告警作用，對于其他障礙物則不起作用，所以其應(yīng)用范圍有限。目前市場上用于輔助司機(jī)倒車的裝置主要有：語音告警裝置、后視系統(tǒng)以及倒車?yán)走_(dá)等。由于存在視覺盲區(qū)，無法看清車后狀況，司機(jī)在倒車時很容易發(fā)生事故。倒車事故發(fā)生的原因是多方面的，造成倒車時的事故率遠(yuǎn)大于汽車前進(jìn)時的事故率，尤其是非職業(yè)駕駛員以及女性更為突出。 The system receive part the weak signal which reflects by the receive probe head collection, When the accepting circuit receives the reflection signal to interrupt the 89C51 counter stop counting, thus obtains the ultrasonic wave from to launch to the receive signal time difference.Keywords :Reversing radar, Ultrasonic, SCM目錄1 引言.....................................................................1 倒車?yán)走_(dá)研究的背景及意義 ........................................................................................................1 國內(nèi)外倒車?yán)走_(dá)的發(fā)展現(xiàn)狀 ...........................................2 雷達(dá)的發(fā)展 .........................................................22 超聲波倒車?yán)走_(dá)的工作原理 ................................................3 超聲波 .............................................................3 超聲波發(fā)生器 .......................................................4 超聲波測距原理 .....................................................4 超聲波測距誤差分析 .................................................6 溫度誤差 .......................................................6 時間誤差 .......................................................62．5 影響超聲波探測的因素 ..............................................7 如何提醒車主 .......................................................93 系統(tǒng)設(shè)計 ................................................................9 倒車?yán)走_(dá)的工作原理圖 ................................................9 系統(tǒng)硬件電路原理圖 .................................................114 系統(tǒng)硬件電路介紹 .......................................................11 AT89C51 單片機(jī) ......................................................11 電源部分 ...........................................................14 放大電路 ...........................................................17 音頻解碼電路分析 ...................................................18 LM567 芯片介紹 ..................................................19 譯碼電路工作原理分析 ...........................................20 LM567 在使用要注意以下幾個方面 ..................................21 聲光報警電路 .......................................................215 系統(tǒng)軟件設(shè)計 ...........................................................22 計算超聲波傳播時間 ..................................................22 超聲波發(fā)生子程序 ....................................................23 超聲波接收中斷程序 ..................................................24參考文獻(xiàn) .................................................................26致 謝 ..................................................................271 引言1．1 倒車?yán)走_(dá)研究的背景及意義隨著我國經(jīng)濟(jì)的快速發(fā)展，交通運(yùn)輸車輛及私家用車的不斷增加，不可避免的交通問題瞬時成為人們關(guān)注的問題。關(guān)鍵詞：倒車?yán)走_(dá)、超聲波、單片機(jī)Based on monolithic integrated circuit backdraft anticollision radar design research修改對應(yīng)的英文文摘AbstractAlong with our country economy rapid development, more and more many people had own automobile, simultaneously by parks the accident which initiates with the backdraft more and more to be also many. These accidents frequently bring many troubles to the pilot, therefore, is helpful in the pilot parks with the backdraft backdraft radar arises at the historic moment.The backdraft radar, is the automobile parks the safe auxiliary unit, can or a more directviewing demonstration informs around the pilot by the sound the obstacle situation, the puzzle which relieved the pilot to have parked with start vehicles when all around visits causes, and helped the pilot to clean the field of vision dead angle and the line of sight fuzzy flaw. This article introduced one kind of use ultrasonic ranging principle research the high performancetoprice ratio backdraft radar, it may remind the pilot to enter the zone of security, simultaneously carries on three levels of acousto畢業(yè)設(shè)計說明書(論文)外文摘要optics to report to the police. Does not need to take driver39。無須占用司機(jī)的視覺資源，使司機(jī)可以把全部注意力用于觀察車前及車旁的路況。倒車?yán)走_(dá)，是汽車泊車安全輔助裝置，能以聲音或者更為直觀的顯示告知駕駛員周圍障礙物的情況。畢業(yè)設(shè)計說明書（論文）中文摘要基于單片機(jī)倒車防撞雷達(dá)的設(shè)計研究摘要隨著我國經(jīng)濟(jì)飛速發(fā)展，越來越多的人擁有了自己的汽車，同時由泊車和倒車所引發(fā)的事故也越來越多。這些事故常常給