Asynchronous ad-hoc network positioning system and positioning method based on bidirectional precise distance measurement

Abstract

The invention provides an asynchronous ad-hoc network positioning system and an asynchronous ad-hoc network positioning method based on bidirectional precise distance measurement, and belongs to the field of wireless communication positioning. The positioning system provided by the invention is composed of a data processing center and a plurality of node terminals, wherein the node terminals have the completely same structure and functions, and each node terminal is composed of a distance measurement module, a routing module, a power supply module and a logic control module. The system integrates a chirp spread spectrum (CSS) distance measurement technology with a ZigBee ad-hoc network technology, and achieves autonomous access and positioning of the new node based on a minimal hop principle. The system is low in cost, small in power consumption, short in positioning time and wide in applicability, and particularly can solve the problem of high precision positioning of groups under hostile geographical environment.

Description

technical field [0001] The invention belongs to the field of wireless communication positioning, and relates to an asynchronous ad hoc network positioning system and a positioning method that integrate CSS-based SDS-TWR precision ranging and ZigBee ad hoc network technology. Background technique [0002] Existing positioning technology's dependence on infrastructure makes it difficult to meet positioning needs in harsh information environments such as no satellites, no mobile communication infrastructure, blind spots, the moon, and the surface of Mars. Consider the following situations that may occur in a harsh information environment: during fire rescue, firefighters need location communication, but the basic indoor positioning facilities have been destroyed, so it is very critical to deploy a positioning system quickly. In times of war, such as street fighting in modern warfare, jungle warfare, etc., fast and convenient positioning is often the key to victory. However, whe...

AI Technical Summary

Problems solved by technology

However, in the actual wireless sensor positioning network, problems such as reflection, multipath propagation, non-line-of-sight, and antenna gain will affect the loss of signal strength.

Therefore, RSSI is also a rough ranging algorithm, and its positioning accuracy in practical applications is relatively low

Due to the above reasons, the existing zigbee positioning system has the disadvantages of low positioning accuracy (3-20 meters error in practice), poor environmental adaptability, easy to be disturbed by the outside world, and cannot be applied in engineering.

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