Wi-Fi indoor positioning method based on rssi and toa ranging
An indoor positioning and distance technology, used in electrical components, wireless communication and other directions, can solve the problems of less data, fewer sampling points, and reduced positioning accuracy and accuracy.
Active Publication Date: 2018-08-24
HEFEI UNIV OF TECH
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This positioning method reduces the time complexity, fast calculation speed, and saves hardware resources, but the number of sampling points is too small, and the collected data is too small, which reduces the accuracy and accuracy of positioning
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[0110] The same mathematical symbols that appear in this text have exactly the same meaning. If there is a discrepancy, the interpretation when the same mathematical symbol appears for the first time in the text shall prevail.
[0111] The preferred modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0112] The present invention adopts the router whose model is TL-2543N of TP-LINK Company as the access point AP, and uses the mobile phone with intelligent WIFI module to collect RSSI signal and TOA data at the same time.
[0113] figure 1 It is a flow chart of the basic method of the present invention. As can be seen from this figure, the present invention mainly comprises the following steps:
[0114] Step 1, collect RSSI signal and build database
[0115] in such as figure 2 10 x 4m shown 2 Set 3 TL-2543N router sockets in the room as 3 access points AP, and four mobile phones with smart WIFI modules as ...
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The invention discloses an RSSI and TOA distance measurement based WIFI indoor positioning method. The RSSI and TOA distance measurement based WIFI indoor positioning method comprises the steps of acquiring an RSSI signal and establishing a database, adopting a positioning matching algorithm to perform data processing, adopting arrival time or colored noise elimination to perform distance measurement, establishing and rotating a planar rotating frame and performing searching, positioning and judgment. The RSSI and TOA distance measurement based WIFI indoor positioning method adopts united RSSI and TOA distance measurement to perform positioning, overcomes the defects existing when an RSSI and TOA are independently positioned and improves positioning precision and accuracy. Especially, a measurement error adapts to change of distance measurement data by establishing a target state equation and a colored noise measurement equation, and large-deviation data filtering-out effect is good. In addition, the planar rotating frame diagram established by means of the method enables the positioning process to be accurate and enables a positioning result to be high in accuracy and approximate to an actual result, and the RSSI and TOA distance measurement based WIFI indoor positioning method can be widely applied to WIFI based indoor positioning.
Description
technical field [0001] The invention relates to an RSSI-based indoor positioning method, in particular to a positioning method based on TOA ranging. Background technique [0002] In WIFI indoor positioning, the positioning algorithm based on RSSI is currently a very common positioning algorithm. RSSI (Received Signal Strength Indicator) is a received signal strength indicator, and its implementation is performed after the reverse channel baseband receive filter. The positioning algorithm based on RSSI is a positioning technology that measures the distance between the signal point and the receiving point through the strength of the received signal, and then performs positioning calculations based on the corresponding data. The basic principle of this method is to estimate the distance by the strength of the radio frequency signal, measure the transmit power and receive power at the sending node and the receiving node respectively, so as to calculate the propagation loss, and...
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IPC IPC(8): H04W64/00
CPCH04W64/00H04W64/006
Inventor 李奇越李伟王建平黎洁孙伟吴忠范海龙
Owner HEFEI UNIV OF TECH