Field calibration device and method for wireless sensor network rssi attenuation model

Abstract

The invention discloses a wireless sensor network RSSI attenuation model field calibration device, including an ultrasonic ranging module, a human-computer interaction module, a radio frequency transceiver module and a microprocessor; the ultrasonic ranging module, human-computer interaction module, and radio frequency transceiver module are respectively connected with the Microprocessor connection. The invention also discloses a field calibration method for the wireless sensor network RSSI attenuation model based on the device. The invention can automatically trigger the calibration process according to the change of the environmental parameters, improve the ranging accuracy and positioning performance of the positioning system in time, and enhance the environmental adaptability of the positioning system.

Description

Technical field [0001] The invention relates to the technical field of wireless sensor networks, and in particular to a device and method for field calibration of RSSI attenuation models of wireless sensor networks. Background technique [0002] A wireless sensor network (Wireless Sensor Network, WSN) is formed by a large number of low-cost sensor nodes through wireless communication, and each network node can independently perform data collection, processing and transmission. The RSSI-based WSN positioning technology relies on the signal attenuation model to convert the collected RSSI information into distance data, and achieve target positioning through position calculation. [0003] However, in a non-line-of-sight transmission environment, because high-frequency wireless signals are easily affected by terrain and obstacles, there are obvious multipath propagation and small-scale fading. A single theoretical model cannot effectively describe the attenuation characteristics in dif...

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Problems solved by technology

[0004] In the prior art, the positioning system using the combination of wireless sensor network and RSSI ranging usually relies on the traditional logarithmic distance path loss model, and no circuit design or similar research using hardware devices to achieve model parameter calibration has been found.

Especially for the ranging algorithm of the RSSI attenuation model, the distance estimation model parameters of most patents are replaced by empirical values, and seldom corrected accurately by field calibration

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