在android中使用Wifi计算位置和距离
如何获取我们的移动设备与建筑物内的 WiFi 热点的距离？这基本上是为了建筑物内的导航目的。任何帮助将不胜感激。
How to get the distance of our mobile device from a wifi hotspot kept inside a building? This is basically for navigational purposes inside the building.. Any help would be appreciated.
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如果您想使用 WiFi 进行室内定位（导航前的步骤 1），那么与 WiFi 接入点的距离并不是正确的方法。请改用 RSSI。
使用 Android，您需要每隔几米移动一次来获取建筑物的 WiFi 指纹，并且 对 RSSI 强度进行采样。您需要提供一个用户界面，让用户可以在建筑物图像（例如 CAD 绘图）上手动指定。这样做将建立一个数据库，记录建筑物中不同位置的 RSSI。当您使用这些数据在室内定位用户时，您需要一个应用程序来测量 RSSI 强度，并将其与您准备好的数据库进行比较，以找到合适的匹配项。
笔记：
- 如果有人添加/删除接入点，您将需要对建筑物进行重新采样
- 测量结果可能会受到人口密度的影响
- 某些接入点是可变强度接入点，因此 RSSI 指纹不一致。
- 这不适用于 iPhone，因为没有 API 可以获取 RSSI 强度。
因此，这是一种有用但并非完美的获取室内位置的方法。有很多关于 RSSI 指纹识别的更详细的文章。
当然，导航必须建立在它的基础上。
If you want to use WiFi for indoor location (step 1 before navigation), then distance to the WiFi Access Points is not the correct approach. Instead use RSSI.
With Android you would need to take WiFi fingerprint of a building by moving around every few meters and sample the RSSI strength. You need to provide a user interface that lets the user manually specify on an image of the building (e.g. a CAD drawing). Doing this will build up a database of what the RSSI is for different locations in the building. When you come to use this data for locating a user indoors, then you need an app to take the RSSI strength measurement and compare it against the database you've prepared to find the appropriate match.
Notes:
- If anyone adds/removes access points, you'll need to resample the building
- The measurements can be affected by density of people
- Some access points are variable strength access points, so the RSSI fingerprint is not consistent.
- This won't work with iPhone because there is no API to get the RSSI strength.
So, it is a useful, but not perfect way to get indoor location. There are a lot of more detailed articles on RSSI fingerprinting available.
Of course, navigation has to be built on to of that then.
您好 Kris
我明白您在问什么，Wifi 接入点和接收器之间的距离，对吗？如果是，那么看了下面的讨论后似乎不可能。
点击此处查看
Hi Kris
I understood what you are asking, The distance between Wifi access point and the Receiver, correct ? If yes, then it seem to be not possible after watching the discussion below.
Click here to see