请教一下GPS导航电文代码的含义
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<1> 当前位置的格林尼治时间,即世界时间,与北京时间差8个小时,格式为hhmmss.ms
<2> 状态, A 为有效位置, V为非有效接收警告,即当前天线视野上方的卫星个数少于3颗。
<3> 纬度, 格式为ddmm.mmmm
<4> 标明南北半球, N 为北半球、S为南半球
<5> 径度,格式为dddmm.mmmm
<6> 标明东西半球,E为东半球、W为西半球
<7> 地面上的速度,范围为0.0到999.9
<8> 方位角,范围为000.0到 359.9 度
<9> 日期, 格式为ddmmyy
注意几点:
1、当GPS数据有效时第17位(一般情况下,程序里最好是找第二个逗号在取下一位判断)为“A”,无效时为“V”;
2、GPS有效时,当速度为0时显示0.0(两位数),当速度不为0时小数点前面数据根据情况变化,最大为三位,此处速度单位为节(海里),需要做处理才能得到我们习惯的单位(公里/小时);
3、GPS无效时,除了第17位显示V以外,不输入速度,角度数据;
4、当给GPS复位时第17位为V,不输出速度,角度,时间数据。 参考技术A GPS定价从一千多到六千多不等,国产的通畅都在四千元以下,我用的E路行,2500,从公司内部拿应该能到1900,厂家会更便宜,因为成本很低。但用GPS很容易走错路,定位范围超过20米,但据说进口的能精确到一米,只是价格比较昂贵,好像得六千多
Touch GPS
Touch Diamond内置了GPS模块和相应的“多普达领航者”软件,而且由于这款机器用的CPU内置的导航模块,所以比较普通的集成GPS手机来说要省电不少。
今天仔细试用了一下它的导航功能:
启动导航软件
Dopod Navigator
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启动之后首先显示的是上一次到达的位置,卫星搜索马上会在后台开始,基本上在晴朗的天气,1分钟内就可以完成卫星的搜索和定位,非常之快。
href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_filelist.xml" rel="file-list" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_themedata.thmx" rel="themedata" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_colorschememapping.xml" rel="colorschememapping" />
进入主菜单,查找目的地为:霄云路。
href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_filelist.xml" rel="file-list" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_themedata.thmx" rel="themedata" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_colorschememapping.xml" rel="colorschememapping" />
点击“确定”之后,领航者马上开始计算路径,并显示出设计好的路线:
href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_filelist.xml" rel="file-list" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_themedata.thmx" rel="themedata" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_colorschememapping.xml" rel="colorschememapping" />
如果之前已经设置了一条路线,那么领航者会自动询问是否要连接两条路线,非常智能化:
href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_filelist.xml" rel="file-list" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_themedata.thmx" rel="themedata" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_colorschememapping.xml" rel="colorschememapping" />
我们的路线现在已经规划好了:
href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_filelist.xml" rel="file-list" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_themedata.thmx" rel="themedata" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_colorschememapping.xml" rel="colorschememapping" />
href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_filelist.xml" rel="file-list" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_themedata.thmx" rel="themedata" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_colorschememapping.xml" rel="colorschememapping" />
看看实际导航的情况。一般来说,如果从西四环到霄云路,我会选择先走紫竹院路上西直门外大街,从西直门桥上北二环,然后从新建的(也不新了)的机场高速2环到3环的联络线,然后从三元桥上东三环,燕莎桥左转。
基本上导航者和我的选择一直,呵呵。
href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_filelist.xml" rel="file-list" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_themedata.thmx" rel="themedata" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_colorschememapping.xml" rel="colorschememapping" />
其实在北京开车很简单,东南西北,城市非常方正,唯一困难的就是各个立交桥的走法,像我这样在北京开了10年车的人都经常会搞糊涂。所以一个导航软件的好坏,很大程度决定于它对细节的注视程度,和人性化程度。
基本上我发现导航者对北京的立交桥都很了解,而且都能给出比较详细的放大图像供查看,大大方便了驾车时候的方便程度。
href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_filelist.xml" rel="file-list" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_themedata.thmx" rel="themedata" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_colorschememapping.xml" rel="colorschememapping" />
先看一个最普遍的通过是立交桥左转示例
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相对复杂一点的紫竹桥右转:
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再来一个副路通过立交桥下的左转车道左转:
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另外,环路的入口和出口也都做了详细的放大显示:
href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_filelist.xml" rel="file-list" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_themedata.thmx" rel="themedata" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_colorschememapping.xml" rel="colorschememapping" />
唯一遗憾的是这个最让北京人头疼的西直门桥还没有任何的放大显示:
href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_filelist.xml" rel="file-list" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_themedata.thmx" rel="themedata" /> href="file:///c:%5cusers%5cleixu%7e1.ssw%5cappdata%5clocal%5ctemp%5cmsohtmlclip1%5c01%5cclip_colorschememapping.xml" rel="colorschememapping" />
不过这个的难度的确大了一点,呵呵。
总的来说,Touch Diamond的内置导航功能非常好用,而且实用,上次的文章中我也提到过它还可以自动提示摄像头,路段限速等等。对于每天都在车海里穿梭的人来说,即便不用它的导航,只是用这个提示每个月也能减少几张罚单吧。呵呵。
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