Method and device for locating wireless sensor terminal

Abstract

The embodiment of the invention discloses a method and a device for locating a wireless sensor terminal. The method comprises the following steps: on the basis of a wireless signal energy attenuation principle, mapping received signal strength indication (RSSI) obtained by all nodes onto probability weighted distance D in an off-line training manner by virtue of a Bayesian model; and more accurately locating the nodes according to a maximum likelihood estimation method and a Kalman filtering method from static and dynamic aspects. In the method, RSSI modeling is carried out statistically, which overcomes the defects such as influence on wireless terminal location caused by antenna directivity, environment and other factors for a small and medium sized mobile terminal signal as well as higher cost caused by the addition of a special sensor in the prior art; and in addition, relative to a classic single linear model or a segmented linear model, the model is updated by an on-line learning method so as to more accurately describe the situation of larger variance in a sample acquired by a small-sized wireless terminal, thus improving the practicability and applicability.

Description

technical field [0001] The present invention relates to the technical field of wireless sensor communication, and more specifically, to a positioning method and device for a wireless sensor terminal. Background technique [0002] As a new information acquisition and processing method in the Internet of Things industry, wireless sensor network has been promoted and applied in the fields of industry, agriculture, medical care and municipal monitoring due to its advantages of simple structure and strong expandability. The wireless sensor network deploys a large number of wireless sensor nodes in the monitoring area, collects and monitors the monitoring object information in the network coverage area in real time, and transmits it to the communication base station through a wireless channel for analysis and processing. [0003] As one of the key technologies in wireless sensor network technology, wireless terminal location technology is responsible for providing location informa...

AI Technical Summary

Problems solved by technology

However, due to the weak adaptability of wireless signals to complex environments, especially when the mobile terminal is miniaturized, the impact of antenna orientation on signal reception strength will further increase and deteriorate the final positioning results

In order to improve the above situation, additional hardware such as angle measurement AOA or time difference TDOA is used for auxiliary operation. The complexity of the terminal not only increases the computational complexity of the terminal, but also increases the hardware cost

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