Vehicular fatigue driving monitoring system

Abstract

The invention discloses a vehicular fatigue driving monitoring system; a Doppler radar detection unit for detecting physiological signal changes of a driver is mounted in a cab and comprises a Doppler radar sensor, a power module, a signal preprocessing module, a differential amplifier, an active bandpass filter, a respiratory and heartbeat signal separation module and a MCU (microcontroller unit) module, wherein the Doppler radar sensor is used for transmitting continuous wave radar signals to a human chest and outputting low-frequency signals, the low-frequency signals are sequentially subjected to multistage signal treatment, and the MCU module acquires human a body respiratory signal and a heartbeat signal and judges whether the driver is in fatigue driving state or not according to the changes in the body respiratory signal and heartbeat signal. Compared with the prior art, it is proposed for the first time that fatigue level of a driver is monitored by means of Doppler measurement technology, detection of steering wheel angle information is added to the system, and fatigue driving measurement precision is improved through multi-source information processing.

Description

technical field [0001] The invention relates to the field of fatigue driving monitoring, in particular to an automobile fatigue driving monitoring system based on physiological signal detection. Background technique [0002] Drowsy driving is one of the most common causes of traffic accidents in the world. According to the report of WHO (World Health Organization), more than 1.3 million people die in traffic accidents every year, and 20 to 50 million people suffer non-fatal injuries because of traffic accidents. Among them, about 20% of fatal traffic accidents are caused by fatigue driving. Therefore, if a system for automatically detecting fatigue driving can be developed, a large number of fatal accidents can be avoided. [0003] In order to prevent the occurrence of such accidents, an effective monitoring system for fatigue driving is necessary, which can remind the driver before the accident occurs, thereby avoiding or reducing the occurrence of such traffic accidents....

AI Technical Summary

Problems solved by technology

However, due to the particularity of physiological signal detection, it is difficult to directly apply the existing general-purpose Doppler radar module to physiological signal detection; because the breathing and heartbeat signals are extremely weak, they are easily submerged in the noise and clutter of the radar. Conventional application circuits of Doppler radar with technology cannot realize non-contact detection of vital signs such as human breathing and heartbeat

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