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Multi-user human-computer interaction method based on millimeter waves

A human-computer interaction, millimeter wave technology, applied in the input/output of user/computer interaction, mechanical mode conversion, computer components and other directions, can solve the output power and efficiency reduction of power source, development limitations and difficulties of millimeter wave radar, etc. question

Inactive Publication Date: 2017-09-05
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, due to technical difficulties, the development of millimeter wave radar was once limited
These technical difficulties are mainly: as the operating frequency increases, the output power and efficiency of the power source decrease, and the receiver mixer and transmission line losses increase

Method used

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  • Multi-user human-computer interaction method based on millimeter waves
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Embodiment Construction

[0011] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings. As attached figure 1 , A millimeter-wave radar chip is embedded in the screen of the computer, and a single-transmit, multiple-receive antenna design is adopted. When the computer starts normally, the radar chip starts to work. The transmitting antenna transmits millimeter wave signals to a specific range in front of the screen at a certain time interval. Obstacles (the user's hand) in front of the antenna will reflect the radio waves back to the radar antenna, while the delay of the reflected signal and the Doppler effect are Corresponds to the user's various characteristics, including the user's distance and speed. The signal emitted by the radar is reflected back from the user, and there is a difference in time and frequency. The time delay τ is the round-trip time of the radio wave, and the change in frequency fd is the Doppler effect cause...

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Abstract

The invention provides a multi-user human-computer interaction method based on millimeter waves. According to the multi-user human-computer interaction method, a millimeter-wave radar chip, a single micro transmitting antenna and a plurality of micro receiving antennas are embedded in a computer screen side, the transmitting antenna is used for transmitting a millimeter-wave signal in a specific range in front of a screen, and when encountering an obstacle, the millimeter-wave signal can be reflected to the receiving antennas. By calculating the time difference and frequency difference between signal transmitting and signal receiving, the distance and relative motion speed between the hands of a current user and the computer screen can be obtained. By comparing phase differences among all the receiving antennas, the arrival angle of each user is calculated, and in combination with the user distances, the spatial location of each user can be obtained. According to spatial location of each user, different users can be distinguished. Finally, distance and speed information of each user are enabled to be in one-to-one correspondence with a gesture of the user so that multi-user human-computer interaction based on the millimeter waves can be achieved. Compared with a technology based on optical stereoscopic imaging, the multi-user human-computer interaction method based on the millimeter waves is low in complexity and power consumption.

Description

Technical field [0001] The invention relates to the technical field of millimeter wave radar, gesture recognition technology and human-computer interaction technology. Background technique [0002] The development of millimeter-wave radar started in the 1940s. In the 1950s, millimeter-wave radars (working wavelength of about 8 mm) for airport traffic control and marine navigation appeared, showing the advantages of high resolution, high accuracy, and small antenna aperture. However, due to technical difficulties, the development of millimeter wave radar was once restricted. These technical difficulties are mainly: as the operating frequency increases, the output power and efficiency of the power source decreases, and the receiver mixer and transmission line losses increase. After the mid-1970s, millimeter wave technology has made great progress, and some better power sources have been successfully developed: solid-state devices such as avalanche tubes and Gunn oscillators; ther...

Claims

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Application Information

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IPC IPC(8): G06F3/01
CPCG06F3/017
Inventor 桂林卿陈洪洋鲍菲菲胡峻舒杨梦霞施云丛海波余海束锋
Owner NANJING UNIV OF SCI & TECH
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