根据WIFI AP和信号强度确定位置 [英] Determining a location based on WIFI APs and Signal Strength

问题描述

我需要根据N个WIFI接入点及其信号强度来确定位置.使用最小二乘拟合算法来做到这一点的最佳方法是吗?我将如何实现这种算法?

I need to determine location based upon N number of WIFI Access Points and their signal strengths. Is the best way to do this using a least-squares fit algorithm? How would I go about implementing such an algorithm?

推荐答案

如果信号强度中的噪声为高斯，即最小二乘拟合应该起作用.遵循正态分布.

Least Squares fitting should work if your noise in the signal strength is Gaussian, ie. follows a normal distribution.

您真正要寻找的是信号强度平均值的最大似然估计器，您希望该估计值在某种程度上与距离相对应.

What you are really looking for is the maximum likelihood estimator for the mean of the signal strength, and you hope that that estimation corresponds in some way to a distance.

最小二乘对应于最大似然准则，如果 实验错误具有正态分布.- http://en.wikipedia.org/wiki/Least_squares

"Least squares corresponds to the maximum likelihood criterion if the experimental errors have a normal distribution." -- http://en.wikipedia.org/wiki/Least_squares

因此，如果您的信号强度噪声不是正态分布(高斯)，那么您就不走运了.

So if your signal strength noise is not normally distributed (Gaussian) you are out of luck.

当然，您也会有一个标准偏差的估计值，它将使您知道自己可以属于位置估计值.您可以记录的WiFi信号越多，来自每个信号的数据点就越多，您的估算就越好.

Of course you will also have a standard deviation of your estimate, which will let you know sure you can be of your location estimate. The more wifi signals, and more data points from each signal you can record, the better your estimate will be.

我也一直在努力寻找时间，请告知结果.

I have been trying to find time to do this too, please do tell how it turns out.

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