Locating method and system based on mixed TDOA and ToF

A positioning method and technology of base stations, which are applied in the directions of location information-based services, positioning, and radio wave measurement systems, can solve problems such as increasing system complexity, long working time of tags, and increased power consumption, and optimize performance and reduce power consumption. The effect of improving power consumption and reliability

Active Publication Date: 2015-01-07
NANJING WOXU COMM TECH
View PDF4 Cites 56 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] 1. The power consumption increases, the tag works for a long time, and the power consumption increases. In the simplest system, there are at least 3 base stations. Every time a base station is added, the tag needs to increase the ranging time, resulting in an increase in power consumption;
[0016]

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Locating method and system based on mixed TDOA and ToF
  • Locating method and system based on mixed TDOA and ToF
  • Locating method and system based on mixed TDOA and ToF

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] As for the specific implementation of the system, it is mainly divided into the following four steps: time synchronization, time difference acquisition, distance acquisition and positioning calculation.

[0071] 1. Time synchronization

[0072] Time synchronization is mainly the function to be completed by base station 2. In this system, server 1 selects a base station 2 as the main base station, which sends time synchronization messages regularly, and other positioning base stations 2 receive messages from the main positioning base station 2. Afterwards, a time correspondence relationship with the primary base station is established. Such as Figure 6 Shown:

[0073] Base station A 2A is the master base station, base station B 2B and base station C 2C are slave base stations. The time synchronization message is sent by A base station 2A;

[0074] TX ts : the time stamp of the time synchronization message sent by A base station 2A;

[0075] RX ts2B : the time sta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a locating method based on mixed TDOA and ToF. The method is characterized by including the steps that firstly, a server selects a main base station and auxiliary base stations and time synchronization among the base stations is completed; secondly, a TDOA message is broadcast through a label and the distance differences between the label and the base stations are calculated through the differences of time when the message reaches the base stations; thirdly, a ToF message is sent to a specific base station through the label so that the distance between the label and the specific base station can be calculated; fourthly, through calculation results in the second step and the third step, the distances between the label and all the base stations are calculated; fifthly, the position of the label is calculated through the distances between the label and all the base stations. Through the improvement method, the same accuracy can be acquired inside and outside a triangle formed by the base stations.

Description

technical field [0001] The invention relates to the technical field of wireless real-time positioning, in particular to a technology for realizing two-dimensional or three-dimensional precise positioning by means of TDOA and TOF. Background technique [0002] The real-time positioning system is also RTLS (Real Time Location Systems). RTLS is a signal-based radio positioning method, which can be active or passive. RTLS enables real-time knowledge of the exact location of a located property, person, vehicle or other located object. [0003] TDOA-based RTLS: [0004] At present, there are two key technologies in the wireless TDOA method, one is time synchronization between base stations, and the other is tag sending messages. The base station calculates the time difference of arrival according to the time of receiving the message, and then adopts the hyperbolic algorithm. To achieve two-dimensional and three-dimensional positioning, the positioning accuracy is relatively high...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04W64/00H04W4/02
CPCG01S5/12
Inventor 房宏肖成海
Owner NANJING WOXU COMM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap