Indoor positioning method based on mobile node assistance
A mobile node, indoor positioning technology, applied in the field of positioning, can solve problems such as errors, unable to meet the requirements of indoor positioning accuracy, and achieve the effects of low cost, stable performance and simple operation
Active Publication Date: 2018-06-29
YANSHAN UNIV
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Problems solved by technology
Because indoor wireless signals are affected by multipath, reflection, refraction, and clock asynchrony, the measured distance will have a large error, which cannot meet the accuracy requirements for indoor positioning.
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[0031] The present invention will be further described below in conjunction with accompanying drawing:
[0032] 1. Node coordinate dimension conversion
[0033] Usually, the complexity of positioning in a three-dimensional space is much greater than that in a two-dimensional plane, which not only requires more information but also requires a greater amount of calculation. In the algorithm designed by the present invention, if the three-dimensional spatial positioning algorithm is directly used, each node needs at least the beacon node to move on three non-parallel straight-line trajectories around it and send signals to obtain enough information required for node positioning, satisfying The trajectory of such conditions is not only difficult to design, but also very inefficient. In addition, even if enough positioning information is obtained, the process of calculating node coordinates will be very complicated, and the positioning results will become less accurate due to the ...
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The invention discloses an indoor positioning method based on mobile node assistance. The method is applied to the indoor environment, and comprises the main steps of firstly determining the height ofan unknown node through an air pressure meter sensor arranged in the node; then, converting the three-dimensional space positioning problem into the two-dimensional plane positioning problem by usinga projection technology; simplifying a positioning model to reduce the calculation quantity; then, building a reasonable beacon node moving path model, wherein all nodes in the network are positionedin a virtual triangular region defined by two lines, and the self of the unknown node can measure the distance from the self to the beacon node path according to the intensity of signals given out when the beacon nodes pass and can estimate the self plane coordinate; finally, integrating the information of the nodes and the unknown nodes for estimating the three-dimensional positioning coordinateof the moving node. The method has the advantages that the positioning is accurate; the performance is stable; the cost is low, and the like.
Description
technical field [0001] The invention relates to the technical field of positioning, in particular to an indoor positioning method. Background technique [0002] With the rapid development of science and technology, the need to quickly and accurately obtain location information of mobile terminals has become increasingly urgent no matter in outdoor or indoor environments. Outdoors, the global positioning system GPS or Beidou positioning methods are generally used, which can achieve m or even cm level accuracy, but due to the influence of buildings, geometric distribution of satellites and multipath effects, the above methods are not suitable for the environment Sophisticated interior. Therefore, it is impossible to achieve high-precision indoor and outdoor seamless positioning only by using GPS and Beidou methods. [0003] In recent years, for indoor positioning, the indoor positioning methods proposed by people can be roughly divided into two categories based on ranging an...
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IPC IPC(8): G01C21/20H04W64/00
CPCG01C21/206H04W64/00H04W64/006
Inventor 关新平孙小芹袁亚洲覃松
Owner YANSHAN UNIV