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

A technology of precise ranging and positioning method, applied in radio wave measurement systems, positioning, measuring devices and other directions, can solve the problems of low positioning accuracy, poor environmental adaptation, signal strength loss, etc., to ensure real-time and positioning accuracy, high Accurate positioning and flexible networking

Active Publication Date: 2017-06-13
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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  • Abstract
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  • Application Information

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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.

Method used

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

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Embodiment Construction

[0030] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] Chirp Spread Spectrum (CSS)

[0032] CSS technology, also known as chirp spread spectrum technology, is the abbreviation of Chirp Spread Spectrum. The basic principle of the CSS technology is to use Chirp signals (that is, linear frequency modulation spread spectrum signals) to carry data symbols. Because Chirp signals are broadband signals, using Chirp signals to represent data symbols can achieve the purpose of expanding bandwidth. In addition to the advantages of traditional spread spectrum signals such as good anti-attenuation ability, good confidentiality, and large processing gain, CSS technology also has strong multipath resolution ability, strong anti-noise ability, and frequency offset tolerance when applied to wireless positioning in complex environments. It has the advantages of small impact and low instantaneous power of transmissio...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02
CPCG01S5/02
Inventor 王垚王缚鹏何成龙晁磊于雪岗崔淼王帅
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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