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Method of intelligent mobile terminal for carrying out danger monitoring and early warning based on Doppler effect

An intelligent mobile terminal and Doppler effect technology, which is applied in the directions of alarms, measuring devices, and sound wave reradiation, can solve the problems of low portability and achieve user-friendliness, high detection accuracy, and good real-time performance

Inactive Publication Date: 2015-11-11
XI AN JIAOTONG UNIV
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Problems solved by technology

This method has high precision, but requires additional hardware equipment and has low portability

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  • Method of intelligent mobile terminal for carrying out danger monitoring and early warning based on Doppler effect
  • Method of intelligent mobile terminal for carrying out danger monitoring and early warning based on Doppler effect
  • Method of intelligent mobile terminal for carrying out danger monitoring and early warning based on Doppler effect

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] see figure 1 , the present invention comprises the following steps:

[0039] 1) State detection: determine whether the user is in a walking state and is using an intelligent mobile terminal device;

[0040] 2) Environmental monitoring: detect the time difference t between the emitted sound wave and the reflected sound wave, and calculate the distance S between the sound source and the obstacle. When the sound source and the user move relative to each other, the vibration frequency of the sound wave received by the user is different from the frequency emitted by the sound source Frequency shift occurs, and by comparing the frequency shift of emitted sound waves and reflected sound waves, the relative motion speed between moving objects in the surrounding environment and smart mobile terminal devices can be detected, so as to judge whethe...

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Abstract

The invention provides a method of an intelligent mobile terminal for carrying out danger monitoring and early warning based on a Doppler effect. The present study rarely involves detection for a potential danger brought about by usage of intelligent equipment, and an existing method based on images and additional equipment has inherent limitations and deficiencies. The method provided by the invention comprises the steps of firstly judging whether a user stays at a walking state or not by using accelerometer data, then monitoring the ambient environment in real time by using a sound Doppler effect and sound ranging, judging whether environmental information has a potential danger or not through a classifier, carrying out early warning on the danger according to the danger level, and timely warning the user of existence of the danger. The method provided by the invention has the characteristics of convenience, timeliness, accuracy, ability of being user-friendly, low power consumption and the like. An experimental result shows that the method has high accuracy and high timeliness and can carry out early warning on dangers. It is believed that the method can play the characteristics of convenience, efficiency and accuracy and has long-term and general applications in the field of mobile danger detection and the field of blind guidance.

Description

technical field [0001] The invention belongs to the field of signal processing, classifiers and sensors, and in particular relates to a method for an intelligent mobile terminal to perform risk monitoring and early warning based on the Doppler effect. Background technique [0002] With the continuous progress of society and the rapid development of science and technology, people's way of life is constantly changing. The new generation of high-performance intelligent mobile terminals represented by smart phones have brought great convenience to people's lives due to their simple operation and portability. In this case, people's dependence on smart devices has gradually increased. On the other hand, it is the dependence on mobile phones that causes many people to focus on their mobile phones anytime and anywhere, and even play with them during travel. As a result, it is easy to ignore potential dangerous factors in the surrounding environment due to distraction, resulting in s...

Claims

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Application Information

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IPC IPC(8): G08B21/04G01S15/58G01S15/52G01S15/93
CPCG01S15/52G01S15/58G01S15/93G08B21/0469
Inventor 韩劲松苟莹颖蒋志平王志赵季中
Owner XI AN JIAOTONG UNIV
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