A positioning method and system based on wifi fusion prediction
A positioning method and technology of positioning system, applied in the field of positioning, can solve problems such as uncertainty and nonlinearity affecting positioning accuracy, positioning system not operating accuracy, ignoring user historical position information, etc. The effect of the ability to filter out noise
Active Publication Date: 2020-12-18
CHONGQING UNIV OF POSTS & TELECOMM +1
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Problems solved by technology
WiFi signals are affected by multipath effects, human body absorption, signal interference, etc., and its uncertainty and nonlinearity seriously affect positioning accuracy
At the same time, the positioning algorithm in the current system does not have good performance and will introduce calculation errors
In harsh indoor environments, traditional positioning systems based on WiFi signals cannot work or obtain positioning results with low accuracy
In the process of research, researchers often ignore the historical location information of users indoors.
Method used
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[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0049] The present invention proposes a positioning method based on WiFi fusion prediction, comprising the following steps:
[0050] S1. Collect received signal strength data from each access point at a reference point;
[0051] S2. Establish an improved Kalman model, and train the improved Kalman model in different environments, input the acquired data into the trained improved Kalman model for filtering, and obtain a fingerprint database;
[0052] S3. The m...
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The present invention relates to the field of positioning technology, in particular to a positioning method and system based on WiFi fusion prediction. The method includes collecting RSSI from each access point at a reference point; The Mann model is trained, and the obtained data is input into the trained improved Kalman model for filtering to obtain a fingerprint library; the mobile terminal collects RSSI and uses the improved Kalman model for filtering; according to the fingerprint library and the WKNN based on the position constraints of the previous time The positioning algorithm obtains the positioning result of the WiFi positioning system; judges whether the number of tracks in the historical track library reaches the threshold, and if so, obtains the prediction result of the current position through the Markov prediction model of fusion sensor information according to the data in the historical track library; the present invention Improve the accuracy of the entire positioning system, and the entire system can still ensure good positioning performance even in harsh indoor environments.
Description
technical field [0001] The present invention relates to the field of positioning technology, in particular to a positioning method and system based on WiFi fusion prediction. Background technique [0002] People have always had a strong demand for Location Based Service, and many human behaviors are based on location. However, the good performance exhibited by satellite signal-based positioning systems in outdoor positioning does not extend to indoor positioning. The strength of the satellite signal on the surface is very weak, and it is easily blocked or scattered by buildings and structures. It usually cannot penetrate the building wall, and the human body also hinders it greatly, making it impossible to enter the room. Therefore, there will be many indoor positioning blind spots, causing the satellite positioning system to However, it cannot be located in indoor places where people often work and move. In order to make up for the defects of satellite system positioning ...
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IPC IPC(8): H04W4/029H04W4/33H04W4/02H04W4/021H04W64/00G06K9/62
CPCH04W4/029H04W4/33H04W4/023H04W64/006G06F18/25
Inventor 尚凤军韩磊
Owner CHONGQING UNIV OF POSTS & TELECOMM