Environment-adaptive device-free target positioning method

A technology without equipment target and positioning method, applied in the field of wireless communication, can solve the problems of target misjudgment, decreased positioning accuracy, fluctuation of RSS measurement value, etc., to achieve the effect of reducing requirements, simple layout and low cost

Active Publication Date: 2014-10-08
智邮开源通信研究院(北京)有限公司
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Problems solved by technology

However, this method ignores the influence of RSS (Received Signal Strength, RSS) measurement by environmental factors. In fact, the RSS measurement value is easily affected by environmental factors such as temperature, humidity, indoor layout and building materials, and even the opening and closing of the door will be affec

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[0032] The embodiments of the present invention will be described below in conjunction with the accompanying drawings of the specification.

[0033] The present invention provides an environment-adaptive deviceless target positioning method, which includes the following steps:

[0034] Step (1), positioning system establishment: positioning area such as figure 1 As shown, the positioning system includes M wireless transceiver nodes for communication, which are networked based on the IEEE802.15.4 wireless communication protocol, and the two can communicate with each other, so they can form K=M×(M-1) / 2 pairs of wireless links.

[0035] According to the communication theory, the Received Signal Strength (RSS) value of the receiving end in the i-th link can be expressed as

[0036] y i (t)=P i -L i -S i (t)-F i (t)-v i (t) (1)

[0037] Among them, i is a natural number, and 1≤i≤K. P i Indicates the transmit power of the transmitting end. Generally, it is assumed that the transmit power ...

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Abstract

The invention discloses an environment-adaptive device-free target positioning method. The environment-adaptive device-free target positioning method includes the steps that a positioning system is established, and the value of strength of a received signal of a receiving end in a link formed between every two wireless communication nodes is obtained; a positioning area is divided into N lattice points, and a sparse positioning model is constructed according to the influence of occurrence of a target at a certain lattice point on the value of strength of the received signal of the receiving end in each link; the weight of influence of changes of the strength of the signal at each lattice point on the value of strength of the received signal of the receiving end in the corresponding link is determined according to an elliptical shadow model to obtain an ideal dictionary; the ideal dictionary is updated and sparsely restored alternately according to changes of the value of strength of the received signal of the receiving end in each link; the position of the lattice point corresponding to a non-zero value in updated sparse vectors is the position of a positioned device-free target. Through the environment-adaptive device-free target positioning method, online dynamic dictionary adjustment and sparse restoration can be performed according to changes for adapting to the environment, changes of the environment can be adapted to dynamically, misjudgment of a target is effectively avoided, and positioning precision is effectively improved.

Description

technical field [0001] The invention relates to an environment self-adaptive device-free target positioning method, which belongs to the technical field of wireless communication technology. Background technique [0002] At present, positioning-based services have covered many fields such as search and rescue, intelligent transportation, navigation and aviation navigation, logistics management, geodetic surveying, marine surveying and mapping, meteorological surveying, disaster prevention, medical services, etc. and one of the necessary means of carrying out military operations. Correspondingly, the research of wireless positioning technology has been paid more and more attention by various countries, and has become a very active research field. [0003] Among the many wireless positioning systems, the most famous is the positioning system that sets radio transmission sources on various orbiting satellites, such as the Global Positioning System (GPS) in the United States, t...

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Application Information

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IPC IPC(8): H04W64/00
Inventor 王婷婷桂小婷柯炜
Owner 智邮开源通信研究院(北京)有限公司
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