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Indoor positioning method and indoor positioning system based on super resolution ultra wideband (UWB) signal broadcast delay estimation

A time delay estimation and indoor positioning technology, applied in the transmission system, radio wave measurement system, wireless communication, etc., can solve the problems of reducing MUSIC performance, performance degradation, loss of resolution, etc.

Inactive Publication Date: 2011-07-20
BEIJING JIAOTONG UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0078] First, MUSIC and IMUSIC can distinguish different time delays when the time delays are very far apart, but when the time delays are very close, the resolution decreases or even loses the ability to distinguish
[0079] Second, algorithms such as MUSIC, when encountering related information sources, performance declines
In TOA estimation, since the delayed signal comes from the same original signal, the correlation between the sources results, which degrades the performance of the MUSIC class
[0080] Third, algorithms such as MUSIC require a large number of sampling points to improve resolution

Method used

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  • Indoor positioning method and indoor positioning system based on super resolution ultra wideband (UWB) signal broadcast delay estimation
  • Indoor positioning method and indoor positioning system based on super resolution ultra wideband (UWB) signal broadcast delay estimation
  • Indoor positioning method and indoor positioning system based on super resolution ultra wideband (UWB) signal broadcast delay estimation

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Embodiment Construction

[0118] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0119] Basic principle of the super resolution model (Super Resolution Model, SRM) of the present invention

[0120] Observing the received signal model of formula (4), its basic concept is to estimate the delay vector τ through other observations. The main idea of ​​SRM is to transform the estimation of delay vector τ into vector A=[α 1 ,...α L ] T estimate. Since τ and A=[α 1 ,...α L ] T is a one-to-one correspondence, so A=[α 1 ,...α L ] T The estimate of means that the estimate of τ is obtained.

[0121] First, construct a known τ vector τ={τ 1 ,...τ T}, need to meet the following conditions

[0122] 1) where {τ 1 ,...τ T} contains a time delay number T that is much greater than the actual time delay number L an...

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Abstract

The invention discloses an indoor positioning method and an indoor positioning system based on ultra wideband (UWB) signal broadcast delay estimation, wherein the method comprises the following steps of: constructing a vector tao, confirming an array Se(tao), constructing an expanding array A, solving the expanding array A, performing delay estimation and performing indoor positioning. By the method, super resolution and constant performance in case of relevant signal sources can be obtained, and near time delay can be obtained in low sampling rate. The method can provide accurate indoor positioning.

Description

technical field [0001] The invention relates to indoor positioning technology, in particular to an indoor positioning method and system based on super-resolution UWB signal propagation time delay estimation. Background technique [0002] In recent years, indoor positioning technology and location-based applications have become a research hotspot. GPS and E911 can also provide positioning services, however, they cannot provide accurate indoor positioning. Accurate indoor positioning is a very important and new field of research with a wide range of commercial, public safety, and military applications. Due to the serious multipath interference and shadow effect interference of indoor radio waves, the measurement error of Received Signal Strength (RSS) and Angle of Arrival (AOA) is greater than that of Time of Arrival (TOA). Therefore, the commonly used measurement in indoor positioning is TOA. In indoor environments, line-of-sight propagation paths are weak or non-existent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00H04B1/7163G01S13/02
Inventor 张令文
Owner BEIJING JIAOTONG UNIV
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