Wireless indoor positioning method based on Wi-Fi
An indoor positioning and wireless technology, applied in location-based services, specific environment-based services, wireless communications, etc., can solve problems such as high complexity and narrow application range, and achieve improved reliability, wide application scenarios, and improved The effect of positioning reliability and accuracy
Active Publication Date: 2020-09-18
南京敏智达科技有限公司
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Problems solved by technology
[0004] The present invention can be used to solve the deficiencies in the prior art, provides a Wi-Fi-based wireless indoor positioning method, solves the problems of high complexity and narrow application range in the existing methods, and utilizes the existing routing Wi-Fi , to achieve higher precision indoor positioning
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[0047] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0048] The present invention is mainly a hybrid positioning system of TDOA positioning and AOA positioning. Among them, the AOA positioning part mainly uses the existing CSI channel state information to obtain the estimated value of AOA using the MUSIC algorithm; TDOA positioning needs to complete the system time synchronization at the router side first; then use the FMCW signal frequency difference to calculate the estimated value of TDOA; finally Using the AOA estimated value and the TDOA estimated value to solve the equations, the final position estimated value is obtained. The indoor positioning method based on Wi-Fi of the present invention comprises the following steps:
[0049] Step 1: Construct an indoor positioning model based on dual-frequency FMCW ranging and CSI;
[0050] Such as figure 1 As shown, taking the triangular wave FM continuous wave as an...
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The invention discloses a novel fusion indoor positioning method. The method comprises the following steps: constructing an indoor positioning model based on dual-frequency FMCW ranging and CSI; and based on the constructed indoor positioning model, performing position calculation by adopting a Chan algorithm and Taylor recursion fusion hybrid positioning algorithm. A FMCW signal has extremely strong anti-interference capability, a radar signal can realize time precision higher than that of a Wi-Fi signal so that the difficulty in indoor TDOA positioning time precision is solved; secondly, dual-frequency FMCW positioning is provided so that the reliability is further improved; in addition, a specific algorithm and a time slot graph for realizing time synchronization between routers and a specific algorithm for detecting and suppressing a multipath effect are given; thirdly, a corresponding solution is provided for the problem of dense antenna array signal coupling; finally, a positionestimation algorithm combining TDOA and AOA is provided, a weighted least square method and a Taylor expansion method are combined, parameter estimation values of TDOA and AOA are comprehensively utilized, and fusion positioning is achieved.
Description
technical field [0001] The invention relates to a Wi-Fi-based wireless indoor positioning method, which belongs to the technical field of indoor wireless positioning. Background technique [0002] At present, the GPS global positioning system is the positioning system with the greatest influence and the widest positioning coverage. Through the global satellite navigation system GNSS (global navigation satellite system), humans can achieve outdoor positioning with sub-meter accuracy at this stage; The weak radio signals emitted by satellites are easily blocked and scattered by buildings and other structures, and most buildings or dense vegetation cannot be penetrated. GPS, which is convenient for outdoor applications, has been greatly affected and limited by indoor complex building structures. As a result, indoor positioning cannot be realized using the GNSS system. With the advent of the era of mobile Internet, mobile service "the last meter" and the realization of precis...
Claims
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Login to View More IPC IPC(8): H04W4/33H04W4/02H04W64/00H04W56/00
CPCH04W4/33H04W4/023H04W64/006H04W56/001
Inventor 陈志敏陈鹏朱秉诚
Owner 南京敏智达科技有限公司