f******o
发帖数: 2469 | 1 Wi-Fi Positioning System (WPS) can determine the location of Wi-Fi enabled
devices. All Wi-Fi Access Points broadcast a signal beacon known as a MAC
address, notifying nearby devices of their presence. WPS refers to the
mapped locations of millions of Wi-Fi MAC addresses to pinpoint the device
location. WPS is complementary to GPS. It works best indoors and in urban
areas, while GPS is limited by physical obstructions of ceilings and tall
buildings. |
c*******h
发帖数: 4883 | 2 wifi覆盖面还不行啊，漫游起来估计很有问题。
【在 f******o 的大作中提到】
: Wi-Fi Positioning System (WPS) can determine the location of Wi-Fi enabled
: devices. All Wi-Fi Access Points broadcast a signal beacon known as a MAC
: address, notifying nearby devices of their presence. WPS refers to the
: mapped locations of millions of Wi-Fi MAC addresses to pinpoint the device
: location. WPS is complementary to GPS. It works best indoors and in urban
: areas, while GPS is limited by physical obstructions of ceilings and tall
: buildings.
|
c*b
发帖数: 3126 | 3 这东西是俺硕士论文课题
【在 f******o 的大作中提到】
: Wi-Fi Positioning System (WPS) can determine the location of Wi-Fi enabled
: devices. All Wi-Fi Access Points broadcast a signal beacon known as a MAC
: address, notifying nearby devices of their presence. WPS refers to the
: mapped locations of millions of Wi-Fi MAC addresses to pinpoint the device
: location. WPS is complementary to GPS. It works best indoors and in urban
: areas, while GPS is limited by physical obstructions of ceilings and tall
: buildings.
|
c*******h
发帖数: 4883 | 4 效果如何？
【在 c*b 的大作中提到】
: 这东西是俺硕士论文课题
|
s*******t
发帖数: 44 | |
c*b
发帖数: 3126 | 6 精度比较低，基本上是你处于多个hot-spot的覆盖范围内，就能大概估计出你当前的位置
要是只能收到一个hotspot的信号，就比较难办
进一步提高精度的话，wifi协议没有定时信号，靠信号传播延时测距基本不可能
靠信号强度的话，wifi天线是椭圆极化，有向性明显，有人动过AP就得重新调整
而且受不同建筑材料的衰减影响不用，更加的不靠谱了
【在 c*******h 的大作中提到】
: 效果如何？
|
c*b
发帖数: 3126 | 7 啥？GPS 民用信号载波 1.5GHz
WiFi 有 2.4GHz 和 5.8GHz 两个频段，波长比 GPS 小多了
而且定位也不是靠波长呀
【在 s*******t 的大作中提到】
: WiFi 信号波长太长了，用来定位精度不够吧
|
c*******h
发帖数: 4883 | 8 靠信号强度测距太不靠谱。如果wifi的ap/router上做了pcf也就可以精确测距了，可惜
。。。
位置
【在 c*b 的大作中提到】
: 精度比较低，基本上是你处于多个hot-spot的覆盖范围内，就能大概估计出你当前的位置
: 要是只能收到一个hotspot的信号，就比较难办
: 进一步提高精度的话，wifi协议没有定时信号，靠信号传播延时测距基本不可能
: 靠信号强度的话，wifi天线是椭圆极化，有向性明显，有人动过AP就得重新调整
: 而且受不同建筑材料的衰减影响不用，更加的不靠谱了
|
G********g
发帖数: 745 | 9 skyhook做的不就是这个吗。 不过它没有做trianglation. |
