WIFI (wireless fidelity) network based RSSI (received signal strength indicator) signal strength secondary locating method and device

A signal strength and secondary positioning technology, applied in wireless communication, wireless communication services, electrical components, etc., can solve problems such as inaccurate positioning results

Active Publication Date: 2014-10-29
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a secondary positioning method and device based on the RSSI signal strength of the WIFI network, which is used to solve the problems caused by the direct calculation method in the existing WIFI network positioning algorithm. The positioning result obtained is not accurate enough

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  • WIFI (wireless fidelity) network based RSSI (received signal strength indicator) signal strength secondary locating method and device
  • WIFI (wireless fidelity) network based RSSI (received signal strength indicator) signal strength secondary locating method and device
  • WIFI (wireless fidelity) network based RSSI (received signal strength indicator) signal strength secondary locating method and device

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[0030] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0031] The signal strength of the wireless signal will attenuate with the increase of the distance, and the attenuation degree of the signal is seriously affected by the environment. The positioning accuracy of the algorithm that calculates the distance based on the RSSI value and then calcula...

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Abstract

The invention provides WIFI (wireless fidelity) network based RSSI (received signal strength indicator) signal strength secondary locating method and device. The WIFI network based RSSI signal strength secondary locating method includes the stage of primary locating and the stage of secondary precise locating. The secondary precise locating specifically includes the steps of rejecting access points (AP) with high error according to information of all access points in a WIFI network, reselecting iteratively the access points with low error each time to guarantee the number of the effective access points is 90-95% of the total number, and correcting initial locating result iteratively continuously to obtain a more precise locating result. During the stage of the secondary precise locating, information of most of access points of the WIFI network is utilized and the access points with high error are rejected, reselection of the new initial coordinate is performed on the basis of the initial coordinate according to Taylor's formula, thus the obtained new initial coordinate is closer to the actual location. Besides, since most of the access points with low error are reselected iteratively each time and the initial locating result is corrected continuously iteratively, the more precise locating result is achieved.

Description

technical field [0001] The invention relates to the field of wireless positioning, in particular to an indoor positioning method and device under a WIFI network. Background technique [0002] According to statistics, more than 80% of the information used by people is related to "location". With the development of mobile internet, the location service (Location Based Servers, LBS) market will develop rapidly. With the vigorous development of LBS and the increasing number of large buildings, people's demand for seamless indoor and outdoor location services is increasing, and the requirements for indoor positioning are getting higher and higher. Improving the accuracy of indoor positioning is very important. [0003] WIFI is a short-distance wireless transmission technology that can support radio access to the Internet within a range of 100 meters Signal , but the existing WIFI positioning is still not accurate enough. Existing positioning methods in infinite sensor networks...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/04H04W64/00
Inventor 刘曙光陈玲玲何沛桦曹磊贺良云
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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