Wireless sensor node ranging and positioning methods for tunnels

Abstract

The invention discloses a wireless sensor node ranging method for tunnels. The method measures the time of message transmission between two nodes to acquire the measured distance between the nodes and reasonably screen measured distances, thus effectively overcoming the affection of the multipath effect, attenuation, distortion and the like of radio signals on the ranging precision in a tunnel environment, and the method has a good inhibition effect on transient faults occurring in the process of ranging. The invention also provides a sensor node positioning method, the measured distance between a mobile node and a reference node is first acquired according to the ranging method, the iteration method is then adopted to calculate the coordinates of the mobile node, the method is added with the process of iterative refinement on the basis of maximum likelihood estimate, and thereby the precision of mobile node positioning calculation is greatly increased.

Description

technical field [0001] The invention relates to the technical field of wireless sensor networks, in particular to a distance measuring and positioning method for wireless sensor network tunnels based on radio frequency transmission time. Background technique [0002] Tunnel refers to a railway or road tunnel under construction, or a coal mining tunnel. Their common features are that the structure is a narrow and long space, and it is constantly changing; the power and communication infrastructure is not complete, and there is no reliable wired or wireless communication link; the ventilation and drainage facilities are not perfect, and the air humidity is high; construction personnel and The construction equipment is dense and the construction environment is harsh. my country is a big coal mining country, and it is in the period of rapid development of infrastructure construction. Construction safety accidents in the above-mentioned tunnels occur from time to time, causing s...

AI Technical Summary

Problems solved by technology

[0010] (1) Traditional wireless positioning technologies such as Ultra Wide Band (UWB) and Global Positioning System (GPS) have high power consumption, and it is difficult to continue to work for several months or even several months under the condition of battery power. year;

[0011] (2) The traditional positioning technology needs to use special signals for ranging, the equipment cost is high, and the data processing is complicated, which is difficult to realize on the wireless sensor nodes with severely limited resources;

[0012] (3) Traditional positioning technology often has high environmental requirements, such as GPS can only be used outdoors, but not indoors or in tunnels

[0013] (4) The traditional positioning algorithm has high time complexity and low calculation accuracy, and is not suitable for running on wireless nodes in tunnels with limited power and calculation capabilities and high real-time requirements

However, the current positioning method based on distance measurement has low accuracy and is not suitable for the positioning of wireless sensor nodes in tunnels.

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