WiFi indoor positioning system and method based on adaptive noise cancellation
A noise cancellation and indoor positioning technology, applied in the field of signal processing, can solve the problems of untimely positioning, positioning accuracy deviation, noise reduction processing, etc., and achieve the goals of improving convergence and stability, accurate indoor positioning accuracy, and solving amplitude distortion Effect
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Embodiment 1
[0034] With the advent of the Internet era, the demand for indoor positioning has also expanded rapidly. The current common indoor positioning technology is the location fingerprint positioning method. Stop, various external noises will cause the amplitude distortion of the WiFi signal, the signal-to-noise ratio will decrease, and the signal value received at the same location at different times will be unstable. The location fingerprint method does not process the received WiFi signal superimposed with noise, and cannot track changes in the external environment, resulting in inaccurate positioning accuracy and other problems.
[0035] In WLAN indoor positioning, the indoor parking lot environment covered by WLAN is mostly complex, such as walls and obstacles, which will affect the signal propagation process, resulting in multiple reflections, scattering and diffraction. In the parking lot, car noise is unavoidable. In WLAN indoor positioning, most of the indoor parking lot e...
Embodiment 2
[0038] The overall composition of the WiFi indoor positioning system based on adaptive noise cancellation is the same as in Embodiment 1. In the present invention, the first delayer and the second delayer synchronously adjust the mixed signal value collected by the mixed signal picker, so that the mixed signal value The delay value l is reached after the same time delay, and the delay value l is less than the correlation length cl of the WiFi signal s and greater than the correlation length cl of the interference noise n , the selected delay value l makes the WiFi signal correlated at time k and (k+l) time, while the noise signal is not correlated at time k and (k+1) time.
[0039] In the present invention, a first delayer is added between the mixed signal pickup unit and the adaptive noise extraction subsystem, and the delay l of the mixed signal is adjusted by the first delayer at time k, and the delay value l is less than the correlation of the WiFi signal length cl s and...
Embodiment 3
[0042] The present invention is also a WiFi indoor positioning method based on adaptive noise cancellation, which is implemented on the above-mentioned WiFi indoor positioning system based on adaptive noise cancellation. The WiFi indoor positioning system based on adaptive noise cancellation is the same as that in Embodiment 1-2, based on Adaptive noise cancellation WiFi indoor positioning method, the working mode is divided into two stages: offline training stage and online matching stage, see image 3 , the output signal of the adaptive noise extraction subsystem is used as an input signal of the adaptive noise canceller, including the following steps:
[0043] Offline training phase:
[0044] (1) Establish a one-dimensional basic coordinate system: establish a grid coordinate system at equal intervals on the ground in the room to be positioned. According to the actual situation of the site, arrange multiple APs so that the signal can completely cover the area to be position...
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