The testing results of the positioning system based on gsm / gprs and gps demonstrate that our new navigation system ’ s performance is much better than those with single positioning technology and the positioning area can be enlarged to indoors 对gps和gsm / gprs基于gps和gsm / gprs的定位系统测试的实验结果表明我们的定位系统确实在定位性能上比单定位方式大大提高。
The third chapter of this thesis has introduced two strategies location method , which is based on " orientation of product advantages " and " orientation of requirement " . the thesis has got the conclusion that the telecommunication industry must realize the transferring from the former one to the later one 本文的第三章通过介绍“产品优势导向” 、 “需求导向”为基础的两种战略定位方式，分析得出电信行业必须实现从前者向后者转变的结论。
The main work of the dissertation is as follows . ( 1 ) the drawbacks of some popular iris location algorithms are analyzed firstly , then an improved coarse - to - fine approach is proposed , which reduces the effects of eyelash occlusion and boundary blurring , two major affected factors . with this approach , the inner boundary is quickly located by searching a coarse center and the outer one by image converting , enhancing , and differentiating 具体工作包括: 1 .分析了已有虹膜定位方法的不足,给出了由粗到精思想的虹膜定位方法,此方法缩小了搜索范围,提高了速度,并且采取了有效的措施消除了睫毛和眼皮的遮掩对定位的影响,此外,针对虹膜图像外边缘模糊的情况,给出了一个外边缘定位方式。
In 3g communication system , the most promising location method was the locating arithmetic based on the time of arrival and the time difference of arrival ( toa / tdoa ) of signal , or the angle of arrival of signal ( aoa ) . however , either the arithmetic based on toa or that based on aoa was badly affected by the none line of sight ( nlos ) phenomenon 在第三代移动通信系统中,最有前景的定位方式是基于信号到来时间/时间差( toa / tdoa )或信号到来角( aoa )的定位算法。但不管是基于信号到来时间的算法还是基于信号到来角度的算法,定位信号的非视距传播效应( nlos )都会对其造成严重的影响,在影响移动定位精度的诸多因素中nlos效应被公认为是最主要的因素。
