Wi-Fi Positioning System 是利用 Wi-Fi 來作定位, 領導廠商是 Skyhook,
Google 也有採用類似的技術, 想必是街景車順便就蒐集了 Wi-Fi 的資料.
日前 Skyhook 才控告 Google 侵權.
iPod/iPad 裡面的 Google Map 就可以使用 Wi-Fi 定位,
其原理是需先蒐集街道上的 Wi-Fi 資料作成後端資料庫, Client 端使用時, Scan Wi-Fi 訊號並回傳資料比對,
Server 端就可以回傳經緯度資料, 若同時間 Scan 到多個 Wi-FI 訊號, 比對訊號強弱可讓定位更精準,
使用 隨身路由器 這種移動型的 Wi-Fi 裝置, 只要所在地有其他 Wi-Fi 訊號, 一樣可以定位.
Wi-Fi Positioning System
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