发现wifi还真可以定位啊

Wi-Fi Positioning System
http://en.wikipedia.org/wiki/Wi-Fi_Positioning_System
Wi-Fi-based positioning system (WPS) emerged as an idea that can solve the p
ositioning in certain situations (like indoors), taking advantage of the rap
id growth of wireless access points in urban areas. Skyhook Wireless is one
provider of this type of service, maintaining a public database that can be
accessed through an API, and get the position based on the access points are
accessible from a terminal. Other providers include the Fraunhofer Institut
e [1] or Google[2]
The localization technique used for positioning with wireless access points
is based on measuring the intensity of the received signal (Received Signal
Strength in English RSS) and the method of "fingerprinting" [3][4]. The accu
racy depends on the number of positions that have been entered into the data
base. The possible signal fluctuations that may occur can increase errors an
d inaccuracies in the path of the user. To minimize fluctuations in the rece
ived signal, there are certain techniques that can be applied to filter the
noise. New laws and regulations are being imposed on VoIP operators to force
them to design systems in which access points can determine the position of
the terminals in a given environment.[5]
还有
http://en.wikipedia.org/wiki/Hybrid_positioning_system
http://en.wikipedia.org/wiki/Mobile_phone_tracking

我觉得测量啥的都不靠谱，WIFI环境太复杂，来几堵墙怎么办？靠谱的方案就是直接拿AP
的位置当作参考位置，跟现在手机上的基站定位似得。