Processing method for converting data collected by sensor in mobile phone to reference coordinate system from mobile phone coordinate system

A reference coordinate system and coordinate system conversion technology, which is applied in the direction of electrical digital data processing, data processing input/output process, instruments, etc. It can solve the problem of not specifying the specific direction and position of the smartphone, ignoring the vehicle coordinate system and the geodetic reference coordinate. system inconsistencies

Pending Publication Date: 2018-10-23
XIAN UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the invention does not specify the specific direction and position of the smartphone on the vehicle, ignoring the inconsistency between the vehicle coordinate system and the earth reference coordinate system in actual road conditions

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  • Processing method for converting data collected by sensor in mobile phone to reference coordinate system from mobile phone coordinate system
  • Processing method for converting data collected by sensor in mobile phone to reference coordinate system from mobile phone coordinate system
  • Processing method for converting data collected by sensor in mobile phone to reference coordinate system from mobile phone coordinate system

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0018] In order to clearly illustrate the effectiveness of the present invention, an experiment of human behavior recognition based on the built-in acceleration sensor of the mobile phone is carried out in this embodiment. The test data selects common human behavior data sets based on accelerometers. This data set is under completely natural conditions. The collector holds the mobile phone (Samsung Galaxy Note 2 smartphone) in his hand, in his trouser pocket or in his handbag. Collect data on many different behaviors.

[0019] The recognition system mainly includes the following modules: data acquisition, preprocessing, feature extraction and selection, and classifier training and recognition modules.

[0020] 1. Data acquisition module: through the built-in three-axis ...

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Abstract

The invention discloses a processing method for converting triaxial acceleration data collected by an acceleration sensor in a mobile phone to a geodetic reference coordinate system from a mobile phone coordinate system. The reference coordinate system is based on a standard orthogonal basis and completely independent of the mobile phone coordinate system; the converted triaxial acceleration datahas a clear physical meaning and can reflect a motion trend of a mobile phone user at each axis more accurately; the X and Y axis data records a motion of the user in a horizontal direction (front/back, left/right); and the Z axis data records a motion of the user in a vertical direction (up/down). Therefore, the influence of a mobile phone orientation on the data collected by the internal acceleration sensor is effectively reduced, so that the correct rate of identifying behaviors of the mobile phone user is remarkably increased; and the method has wide application values in mobile terminal-based context awareness.

Description

technical field [0001] The invention proposes a processing method for converting three-axis acceleration data collected by a built-in sensor of a mobile phone from a mobile phone coordinate system to a geodetic reference coordinate system, and the method relates to the fields of mobile communication, pattern recognition, and situation perception. Background technique [0002] At present, behavior recognition based on smart phones is a research hotspot in environmental intelligence, and has extremely broad application prospects. A variety of sensors built into smartphones, such as acceleration sensors, gyroscopes, magnetometers, and direction sensors, can sense different movements, directions, and external environments, especially when monitoring equipment movement and position changes. Three-dimensional data; but these data are based on the coordinate system of the mobile phone, and the collected data will change when the position or direction of the mobile phone is changed....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/0346H04M1/725
CPCG06F3/0346H04M1/724H04M1/72448H04M1/72403
Inventor 王忠民衡霞曹栋李卓李杨
Owner XIAN UNIV OF POSTS & TELECOMM
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