Environment-adaptive device-free target positioning method

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...

AI Technical Summary

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 affected. Causes fluctuations in RSS measurements

More importantly, this effect is time-varying and unpredictable, so in the actual environment, this method is easy to mistake the RSS fluctuations caused by environmental factors as caused by the target, resulting in misjudgment of the target and a decrease in positioning accuracy.

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