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Method for locating a beacon by angles of arrival

A technology for locating beacons and angles, applied to orientation devices for positioning and direction determination, direction finders using radio waves, etc., can solve problems such as distribution difficulties

Active Publication Date: 2018-08-31
THE SWATCH GRP RES & DEVELONMENT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technique is limited in interior locations where the waves then take multiple paths, notably due to reflections from surrounding disturbing elements
The estimation function of the angle of arrival therefore contains multiple spikes whose assignment to direct paths or to paths generated by reflections is difficult

Method used

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  • Method for locating a beacon by angles of arrival
  • Method for locating a beacon by angles of arrival
  • Method for locating a beacon by angles of arrival

Examples

Experimental program
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Embodiment Construction

[0061] The object of the invention is to locate a beacon X in an environment characterized by a plurality of reflective elements, four of which are identified by reference symbol P 11 ,P 12 ,P 21 and P 22 express. In any environment, reflective elements can have different dimensions, such as figure 1 shown.

[0062] Beacon X is configured to emit different wavelengths (λ i ) i＝1..R The R signals of (Sg i ) i＝1..R , where R is an integer equal to or greater than 2. For clarity, in figure 1 Only two signals Sg are shown in 1 and Sg 2 , the corresponding wavelength is λ 1 and lambda 2 . The signal emitted by beacon X (Sg i ) i＝1..R Reflect from reflective elements to varying degrees depending on their wavelength. An interfering element with a size close to the wavelength of a given signal will in fact specifically reflect that signal, but will only reflect signals with wavelengths that differ substantially from its size to a limited extent. Naturally, the dimens...

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Abstract

The invention relates to a method for locating a beacon (X) which consists in performing R sequences, R being an integer no lower than 2, each including receiving, on a first antenna array (A1) and ona second antenna array (A2), a signal from the beacon (X), the signals of the R sequences having different wavelengths, and calculating a first function for estimating the angles of arrival of the signal on the first antenna array (A1) and a second function for estimating the angles of arrival of the signal on the second antenna array (A2), and in correlating the R first estimation functions withone another, and the R second estimation functions with one another, so as to determine a first angle ([phi]1) between the beacon (X) and the first array (A1), and a second angle ([Phi]2) between thebeacon (X) and the second array (A2), respectively.

Description

technical field [0001] The present invention relates to the technical field of devices and methods for locating beacons. Any device used for positioning purposes and which can be located and identified by suitable means may be referred to as a beacon. Background technique [0002] It is known to locate a beacon by calculating the direction of propagation of a radio frequency signal originating from the beacon and incident on a network of at least two antennas. This technique is known as the angle-of-arrival positioning method. In this context, many algorithms have been developed for estimating the angle of arrival of signals on the antenna network. More precisely, these algorithms are able to compute functions that relate probabilities to angles of arrival of signals on the antenna network. [0003] For example, "MUSIC" ("Multiple emitter location and signal parameter estimation)" described by R.O. Schmidt in the article "Multiple emitter location and signal parameter est...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/04G01S5/02G01S5/04G01S3/48
CPCG01S3/04G01S3/48G01S5/0226G01S5/04G01S3/043
Inventor A·卡萨格兰德
Owner THE SWATCH GRP RES & DEVELONMENT LTD