Wifi fingerprint database construction method based on multi-sensor device

A multi-sensor and database technology, applied in measuring devices, instruments, surveying and mapping and navigation, etc., can solve the problem of consuming a lot of time and manpower in building and updating WiFi databases

Inactive Publication Date: 2015-11-11
WUHAN YIDELU POSITION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for buildings with a large area, the construction and update of the WiFi database need to consume a lot of time and manpower

Method used

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  • Wifi fingerprint database construction method based on multi-sensor device
  • Wifi fingerprint database construction method based on multi-sensor device
  • Wifi fingerprint database construction method based on multi-sensor device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Such as figure 1 Shown is a method for constructing a wifi fingerprint database based on a multi-sensor device provided by an embodiment of the present invention, the multi-sensor device includes an accelerometer, a magnetometer, a gyroscope, a wireless signal transceiver and a processor, and the method includes :

[0050] In step 201, the navigation state of the multi-sensor device is initialized, wherein the navigation state includes initial position information, initial speed information and initial attitude information.

[0051] Among them, the multi-sensor device can use physical sensors or technologies, such as gyroscopes, accelerometers, magnetometers, barometric altimeters, GPS, etc., and can also add virtual sensors, such as a virtual gyroscope composed of a group of photos, a virtual Odometer, landmark location provided by map information, etc. The device referred to in step 1 can be a professional measurement or navigation system or platform built using the...

Embodiment 2

[0089] This embodiment further proposes a method to improve the implementation efficiency based on the implementation of the first embodiment, specifically: if there is a sensor that can directly provide the location information of the device, for example, the device receives GPS, pseudolite or other positioning technology during the navigation process. signal, and the positioning accuracy meets the requirements, you can choose to skip step 203 to calculate the position information of the multi-sensor according to the navigation algorithm, and directly use the position information to construct and update the WiFi fingerprint database. Such as figure 2 shown.

Embodiment 3

[0091] This embodiment provides a specific reasoning method for step 203 in Embodiment 1, specifically including:

[0092] First, the inertial navigation Kalman filter algorithm is used to calculate the attitude information of the device in real time. The Kalman filter system model is:

[0093] δ r · n δ v · n ψ · = - ω e ...

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Abstract

The invention is suitable for the wifi fingerprint positioning technology field and provides a wifi fingerprint database construction method based on a multi-sensor device. The method comprises the following steps of initializing a navigation state of the multi-sensor device; carrying the multi-sensor device to move in a target area, wherein in the target area, a wifi fingerprint database is about to be built or be updated; a processor of the multi-sensor device acquires data collected by each sensor in real time; the collected data comprises speed information, attitude information and a wifi signal; the speed information and the attitude information are acquired by an accelerometer and a magnetometer, and the wifi signal is acquired by a wireless signal transceiver; according to a navigation algorithm, calculating position information of multiple sensors; and according to a wifi signal combination collected at the same time, constructing or updating the wifi fingerprint database. In an embodiment of the invention, through using continuous navigation information provided by the sensors, a traditional point-by-point measurement method is replaced so as to complete construction and updating work of a wifi database.

Description

technical field [0001] The invention belongs to the technical field of wifi fingerprint positioning, and in particular relates to a method for constructing a wifi fingerprint database based on a multi-sensor device. Background technique [0002] Facing the advent of the era of Location Based Services (LBS for short) for the public, and the popularity of mobile terminals such as smart phones, there is an increasing demand for obtaining personal location and surrounding service information anytime and anywhere. As the main means of obtaining spatial information data, navigation and positioning is a core technology of LBS. [0003] The WiFi-based positioning system has the characteristics of no need to add or modify existing hardware, and low cost, so it is one of the most promising indoor navigation and positioning methods. Among them, the WiFi fingerprint identification and positioning technology directly uses the strength of the received wireless signal without considering ...

Claims

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Application Information

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IPC IPC(8): G01S5/02G01C21/16
CPCG01S5/0257G01C21/165G01S5/0273
Inventor 张鹏李由
Owner WUHAN YIDELU POSITION TECH CO LTD
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