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title='電子通信論文'>電子通信論文</a><code>></code>GPS串口數(shù)據(jù)接收程序?qū)嵗?/div> <div id="xhhfjdvbzhp" class="article"> <script type="text/javascript">s("title_top");</script> <h1 class="title">GPS串口數(shù)據(jù)接收程序?qū)嵗?/h1> <div id="xhhfjdvbzhp" class="conetnt_from"> <span id="xhhfjdvbzhp" class="time">時(shí)間：2023-02-21 00:15:46 </span> <span id="xhhfjdvbzhp" class="sm_after_time"></span> <span id="xhhfjdvbzhp" class="source"><a target="_blank" href="http://www.panasonaic.com/ligong/List/List_99_1.html" title="電子通信論文">電子通信論文</a></span> <span id="xhhfjdvbzhp" class="source"><a target="_blank" href="http://www.panasonaic.com/usr/login.html" title="我要投稿">我要投稿</a></span> </div> <script type="text/javascript">s("content_top");</script> <div id="xhhfjdvbzhp" class="content"> <div id="xhhfjdvbzhp" class="excellent_articles_box"> <ul> <li id="xhhfjdvbzhp" class="excellent_articles_title">相關(guān)推薦</li> </ul> </div> <p>GPS串口數(shù)據(jù)接收程序?qū)嵗?/p> <strong>摘要</strong>：目前GPS（全球定位系統(tǒng)）定位應(yīng)用市場日趨成熟，正在進(jìn)入應(yīng)用的高速發(fā)展時(shí)期。本文以一款EverMore公司的GM-X205GPS接受模塊為例，介紹了其數(shù)據(jù)格式，以及應(yīng)用PIC16F874單片機(jī)RS232串口進(jìn)行數(shù)據(jù)接收的程序。 <p> <strong>關(guān)鍵詞</strong>：GPS、NMEA格式、PIC16F874、串口數(shù)據(jù)接收</p> <p> <strong>1、 GPS應(yīng)用簡介</strong></p> <p> 近年來GPS系統(tǒng)，已經(jīng)在大地測繪、海上漁用、車輛定位監(jiān)控、建筑、農(nóng)業(yè)等各個(gè)領(lǐng)域得到廣泛應(yīng)用。從九十年代我國引進(jìn)GPS定位技術(shù)開始，經(jīng)過十多年的市場培育，GPS定位應(yīng)用進(jìn)入了發(fā)展的最好時(shí)機(jī)，未來十年基于GPS的應(yīng)用將會(huì)改變我們的生活和工作方式。 </p> <p> 目前市場上的大部分GPS接受模塊都是通過RS232串口與MCU進(jìn)行數(shù)據(jù)傳輸?shù)�。這些數(shù)據(jù)包括經(jīng)度、緯度、海拔高度、時(shí)間、衛(wèi)星使用情況等基本信息。開發(fā)人員再依據(jù)這些基本數(shù)據(jù)，進(jìn)行數(shù)據(jù)處理來完成整套的定位系統(tǒng)軟件。</p> <p> <strong>2、 GM-X205模塊數(shù)據(jù)格式</strong></p> <p> 在進(jìn)行數(shù)據(jù)接受編程之前，先介紹一下該模塊的數(shù)據(jù)格式。它支持NMEA-0183輸出格式。信息如下：</p> <p> GGA位置測定系統(tǒng)定位資料（Global Positioning System Fix Data）<br /> GSV 導(dǎo)航衛(wèi)星資料（GNSS Satellites in View）<br /> RMC導(dǎo)航衛(wèi)星特定精簡資料（Recommended Minimum Specific GNSS Data）<br /> VTG 方向及速度等相關(guān)資料（Course Over Ground and Ground Speed）<br /> 由于文章篇幅問題，筆者在這里只以接收GGA數(shù)據(jù)為例，格式如下：<br /> $GPGGA,hhmmss,dddmm.mmmm,a,dddmm.mmmm,a,x,xx,x.x,x.x,M,,M,x.x,xxxx*CS<br /> 例：$GPGGA,033744,2446.5241,N,12100.1536,E,1,10,0.8,133.4,M,,,,*1F</p> <p></p> <p class=msonormal>說明見表：</p> <p class=msonormal>區(qū)域</p> <p class=msonormal>名稱</p> <p class=msonormal>例</p> <p class=msonormal>單位</p> <p class=msonormal>說明</p> <p class=msonormal>1</p> <p class=msonormal>信息ID</p> <p class=msonormal>$GPGGA</p> <p class=msonormal> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></p> <p class=msonormal>GGA協(xié)議開始</p> <p class=msonormal>2</p> <p class=msonormal>UTC時(shí)間</p> <p class=msonormal>033744</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>hhmmss</p> <p class=msonormal>3</p> <p class=msonormal>緯度</p> <p class=msonormal>2446.5241</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>dddmm.mmmm</p> <p class=msonormal>4</p> <p class=msonormal>南/北半球指示</p> <p class=msonormal>N</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>N=north ； S=south</p> <p class=msonormal>5</p> <p class=msonormal>經(jīng)度</p> <p class=msonormal>12100.1536</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>dddmm.mmmm</p> <p class=msonormal>6</p> <p class=msonormal>東/西半球指示</p> <p class=msonormal>E</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>E=east ； W=west</p> <p class=msonormal>7</p> <p class=msonormal>定位指示</p> <p class=msonormal>1</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>0 =未定位</p> <p class=msonormal>1=定位SPS模式</p> <p class=msonormal>2=定位DGPS, SPS模式</p> <p class=msonormal>8</p> <p class=msonormal>應(yīng)位衛(wèi)星數(shù)</p> <p class=msonormal>10</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>00-12</p> <p class=msonormal>9</p> <p class=msonormal>HDOP</p> <p class=msonormal>0.8</p> <p class=msonormal>米</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>10</p> <p class=msonormal>海拔高度</p> <p class=msonormal>133.4</p> <p class=msonormal>米</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>11</p> <p class=msonormal>海拔高度單位</p> <p class=msonormal>M</p> <p class=msonormal>米</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>12</p> <p class=msonormal>WGS84水準(zhǔn)面劃分</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>13</p> <p class=msonormal>WGS-84水準(zhǔn)面劃分單位</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>14</p> <p class=msonormal>累計(jì)GPS數(shù)據(jù)微分</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>本模塊中不可用</p> <p class=msonormal>15</p> <p class=msonormal>參考工作站ID</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal>本模塊中不可用</p> <p class=msonormal>16</p> <p class=msonormal>校驗(yàn)位</p> <p class=msonormal>*1F</p> <p class=msonormal> <o:p></o:p></p> <p class=msonormal> <o:p></o:p></p> <p>上面例子中，我們可讀出位置信息：北緯24度46.5241分，西經(jīng)121度00.1536分<br /> 格林威治時(shí)間：3點(diǎn)37分44秒<br />3、 PIC16F874數(shù)據(jù)接收程序<br />筆者在系統(tǒng)中把接收到的數(shù)據(jù)處理后，顯示到圖形液晶屏上。限于篇幅在這里只給出數(shù)據(jù)接收部分程序，并且只接收經(jīng)度和時(shí)間信息，并且給出格林威治時(shí)間轉(zhuǎn)換為北京時(shí)間的轉(zhuǎn)換函數(shù)。其他數(shù)據(jù)接收程序類似。<br />;**********************************************************<br />; THIS IS A GPS RECEIVER PROGRAM *<br />;**********************************************************<br /> LIST P=16F874<br /> INCLUDE P16F874.INC <br />;*******寄存器定義 ********************<br />TEMP1 EQU 0X27<br />W_TEMP EQU 0X54 <br />STATUS_TEMP EQU 0X55<br />LONG1 EQU 0X40 ；LONG1--- LONG10經(jīng)度的10位數(shù)據(jù)<br />LONG2 EQU 0X41<br />LONG3 EQU 0X42<br />LONG4 EQU 0X43<br />LONG5 EQU 0X44<br />LONG6 EQU 0X45<br />LONG7 EQU 0X46<br />LONG8 EQU 0X47<br />LONG9 EQU 0X48<br />LONG10 EQU 0X49<br />T1 EQU 0X58 ;T1---T6時(shí)間的6位數(shù)據(jù)<br />T2 EQU 0X59<br />T3 EQU 0X60<br />T4 EQU 0X61<br />T5 EQU 0X62<br />T6 EQU 0X63<br />;********************************************************<br /> ORG 00H <br /> NOP<br /> NOP<br /> GOTO MAIN<br /> ORG 04H ;設(shè)定按中端健才開始數(shù)據(jù)接受<br /> NOP<br /> NOP<br /> GOTO INTERRUPT<br />;*********判斷頭文件是不是'$GPGGA’**********<br />IDMESSAGE<br /> BCF STATUS,RP0<br />BREAK0 <br /> CALL PAND<br /> MOVWF TEMP1<br /> MOVLW '$' ;detect $<br /> SUBWF TEMP1,0<br /> BTFSS STATUS,Z<br /> GOTO BREAK0<br /> CALL PAND<br /> MOVWF TEMP1<br /> MOVLW 'G' ;detect G<br /> SUBWF TEMP1,0<br /> BTFSS STATUS,Z<br /> GOTO BREAK0<br /> CALL PAND<br /> MOVWF TEMP1<br /> MOVLW 'P' ;detect P<br /> SUBWF TEMP1,0<br /> BTFSS STATUS,Z<br /> GOTO BREAK0<br /> CALL PAND<br /> MOVWF TEMP1<br /> MOVLW 'G' ;detect G<br /> SUBWF TEMP1,0<br /> BTFSS STATUS,Z<br /> GOTO BREAK0<br /> CALL PAND<br /> MOVWF TEMP1<br /> MOVLW 'G' ;detect G<br /> SUBWF TEMP1,0<br /> BTFSS STATUS,Z<br /> GOTO BREAK0<br /> CALL PAND<br /> MOVWF TEMP1<br /> MOVLW 'A' ;detect A<br /> SUBWF TEMP1,0<br /> BTFSS STATUS,Z<br /> GOTO BREAK0<br /> CALL PAND ;跳過逗號(hào)<br /> RETURN<br />;************接收函數(shù)******************<br />RECEIVE<br /> CALL PAND ;開始時(shí)間數(shù)據(jù)接收<br /> MOVWF T1<br /> CALL PAND<br /> MOVWF T2<br /> CALL PAND<br /> MOVWF T3<br /> CALL PAND<br /> MOVWF T4<br /> CALL PAND<br /> MOVWF T5<br /> CALL PAND<br /> MOVWF T6 ;時(shí)間數(shù)據(jù)接收完成<br /> CALL PAND ;跳過逗號(hào)<br /> CALL PAND ;跳過10位緯度數(shù)據(jù)---開始<br /> CALL PAND<br />CALL PAND<br /> CALL PAND <br /> CALL PAND<br /> CALL PAND<br /> CALL PAND <br /> CALL PAND<br /> CALL PAND<br /> CALL PAND ;跳過10位緯度數(shù)據(jù)---結(jié)束<br /> CALL PAND ;跳過逗號(hào)<br /> CALL PAND ;跳過南/北緯判斷位數(shù)據(jù)<br /> CALL PAND ;跳過逗號(hào)<br /> CALL PAND ;接受經(jīng)度信號(hào)開始<br /> MOVWF LONG1<br /> CALL PAND<br /> MOVWF LONG2<br</p> <br /> </p> 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