近來幾年智慧型手機和適地性服務已經變得非常熱門。 智慧型手機必須有辦法知道使用者的位置，因此精準的定位技術就變得重要。 至今人們只能夠在特定的環境利用某些定位方法，就像是GPS只能用於室外的空間。 但是人們總是生活於大範圍的環境像是校園、都市和觀光區，這種大範圍的環境包含了室內和室外的空間。
大範圍的環境下，單一定位技術未必到處都可用，因此我們結合了GPS、WiFi和物聯網定位提出了一個異質式定位演算法。 我們提出“定位可能性”來選擇比較“可靠”(可能)的定位方法。 除此之外，利用較可靠的鄰近使用者與自己之間的WiFi訊號強度可更進一步改善定位的精準度。特別針對某些使用者在沒有任何可用的定位方法時更有幫助。這個方法被稱為“合作式定位”。
最後，我們用模擬來評估我們演算法的精準度。 因為訊號強度每分每秒都在波動，因此我們測量實際的訊號強度和GPS放入模擬器，讓實驗結果變得更真實。 最後我們也證明我們的演算法可以做在手機上而且更精準。 / Smart phones and Location Based Services (LBSs) have become very popular in recent years. To this end, the smart phone needs to know the locations of users. Therefore, an accurate localization technique is important. To date people can use some localization systems in some specific areas. For instance, GPS can only be used in the outdoor space. However, people always live in large scale environments like campus, urban and tourist areas. The large scale environments should include indoor and outdoor space.
For large scale environment, a single location technique is not always available everywhere. Therefore, we proposed a heterogeneous localization algorithm which combines GPS, WiFi and Internet Of Things (IOT) localizations. We proposed “localization possibility” for each localization methods. This algorithm use localization possibility to select the most “reliable” (possible) one. Besides, the more reliable nearby users can further enhance the localization by measuring the relative WiFi signal strength. It helps especially for those users who have no any available localization methods. This method is called “cooperative localization”.
Finally, we evaluated the accuracy of our algorithms by simulation. Because signal strength fluctuates from minute to minute, we measured empirical data and put into the simulator to make our experimental results more real. Finally, we also verify that our idea can be implemented on smart phones and our algorithm is more accurate.
| Identifer | oai:union.ndltd.org:CHENGCHI/G0098753038 |
| Creators | 鄧偉敦, Teng, Wei Tun |
| Publisher | 國立政治大學 |
| Source Sets | National Chengchi University Libraries |
| Language | 英文 |
| Detected Language | English |
| Type | text |
| Rights | Copyright © nccu library on behalf of the copyright holders |
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