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 對gps和gsm / gprs基于gps和gsm / gprs的定位系統(tǒng)測試的實驗結(jié)果表明我們的定位系統(tǒng)確實在定位性能上比單定位方式大大提高。
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 本文的第三章通過介紹“產(chǎn)品優(yōu)勢導(dǎo)向” 、 “需求導(dǎo)向”為基礎(chǔ)的兩種戰(zhàn)略定位方式,分析得出電信行業(yè)必須實現(xiàn)從前者向后者轉(zhuǎn)變的結(jié)論。
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 具體工作包括: 1 .分析了已有虹膜定位方法的不足,給出了由粗到精思想的虹膜定位方法,此方法縮小了搜索范圍,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對定位的影響,此外,針對虹膜圖像外邊緣模糊的情況,給出了一個外邊緣定位方式。
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 在第三代移動通信系統(tǒng)中,最有前景的定位方式是基于信號到來時間/時間差( toa / tdoa )或信號到來角( aoa )的定位算法。但不管是基于信號到來時間的算法還是基于信號到來角度的算法,定位信號的非視距傳播效應(yīng)( nlos )都會對其造成嚴重的影響,在影響移動定位精度的諸多因素中nlos效應(yīng)被公認為是最主要的因素。