Abstract
For indoor WLAN positioning it is difficult to achieve decimeter or centimeter-level precision questions, to IEEE1588v2 (PTP) precision network clock synchronization technology and the arrival time difference principle (TDOA), combined with non line of sight (NLOS) error mitigation techniques ranging research and design a set based on the existing WLAN (IEEE802.11x series of standards) device with high precision realtime location solutions. First, build a high-performance software-defined radio network communications platform, for accurate measurement of the radio signal arrival time and is calculated based on TDOA location. Secondly, the use of high-precision clock IEEE1588v2 standard equipment PTPGrand-2100 as a network clock source, through the integrated application of multi-hop latency compensation and asymmetric compensation algorithm to ensure nanosecond clock synchronization between the various WLAN access points (AP) accuracy(Experiments show that 1 nanosecond time synchronization error is equivalent to 10 to 30 cm of positioning error). Finally, based NLOS error becomes stability principle, filtered NLOS error and pre-positioned before the data, eliminate the influence of the greatest degree of NLOS error, the time domain error control in wireless ranging 5ns or less to achieve decimeter or more accurately estimate the position. The case can be widely used in mobile Internet, logistics management, mineral exploration, health and other needs of the precise location services (LBS) in other industry sectors.
Highlights
With the advent of the "Internet of Things" era, the wireless location technology as a key technology, has caused the industry wide attention and domestic and international research
Based on the signal strength (RSSI) positioning technology is greatly affected by the signal propagation environment, the general accuracy is not high, the error is typically greater than 20 meters, far beyond the need for high precision positioning of many practical applications
In order to address indoor Wireless local area network (WLAN) positioning is difficult to achieve decimeter or centimeter precision problem, the research group studied and proposed to reach the time difference principle (TDOA) and IEEE1588v2 (PTP) precise network clock synchronization technology, combined with non-line of sight (NLOS) ranging error elimination technology, research and design based on a set of high-precision conventional WLAN (IEEE802.11x series of standards) devices RTLS solutions
Summary
With the advent of the "Internet of Things" era, the wireless location technology as a key technology, has caused the industry wide attention and domestic and international research. The wireless location technology has a very broad application prospects in many areas of military defense, traffic management, disaster relief, environmental hazards, automation workshop and logistics management. The demand for highaccuracy wireless location technology will show rapid growth, for wide-area decimeter accuracy real-time location, or urban areas of real-time meter level accuracy positioning technology, in the few years. Fund Project: Hubei Provincial Department of Education 2015 annual science and technology research projects (No.B2015193); 2014 Hubei Provincial Higher Teaching research project (No 2014424); 2014 Hubei Provincial Colleges and Universities outstanding young scientific and technological team plans funded project (No.T201431);2014 Wuhan Office of Information Industry wireless city construction of demonstration projects (No.GCJH2014005). The current commercial WLAN devices or chips do not support the high accuracy of the signal arrival time record
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