CN109300280A - A kind of wearable device and its method for early warning with anti-snatch warning function - Google Patents
A kind of wearable device and its method for early warning with anti-snatch warning function Download PDFInfo
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/0297—Robbery alarms, e.g. hold-up alarms, bag snatching alarms
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Abstract
The invention discloses a kind of wearable devices with anti-snatch warning function, including human body detection circuit, range-measuring circuit, controller, wireless transport module, human body detection circuit and range-measuring circuit are connected with controller respectively, and controller is connected by wireless transport module with mobile terminal.The step of method for early warning of the present invention, is: human infrared radiation amount behind detection is current；Relative distance of the object relative to wearable device behind detection is current；According to whether having human body in monitoring region behind the judgement of human infrared radiation amount, according to relative distance and its distance change, the mobile velocity and acceleration of object behind calculating；When determine rear object be human body, and the speed of human motion be more than setting value, relative distance be less than setting value, then be determined as that dangerous human body is close, wearable device control mobile terminal carry out early warning movement.The present invention has the advantages that small in size, early warning is accurate.
Description
Technical field
The present invention relates to personal security's safeguard research field, in particular to a kind of wearing with anti-snatch warning function
Wear device and its method for early warning.
Background technique
The development of Modern mobile terminal is swift and violent, and in this background, mobile terminal is gradually instead of electricity other in life
Sub- equipment, it might even be possible to say and have become one of necessary article of life.But this necessary article is a double-edged sword, with have well
Conducive to improve life convenient degree, with it is bad will allow people become road race of bowing.On the road of traveling, only look at mobile whole
It walks without noticing danger that may be present, while at night at end, it appears that the more for example most of female of the group of weak tendency
Property is all than relatively hazardous, and when facing a danger, the reaction of people generally all can be very flurried, is difficult making one immediately instantly
A preferable personal security's protection act.
There are some researchs for plundering warning aspect at present, but generally existing method for early warning precision is not high, early warning is set
The defects of standby complicated, at high cost, volume is big, actual application demand it is not able to satisfy still.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology with it is insufficient, provide it is a kind of with anti-snatch warning function can
Object wearing device and its method for early warning, the wearable device have the advantages that small in size, early warning is accurate.
The purpose of the present invention is realized by the following technical solution: a kind of wearable device with anti-snatch warning function,
Including human body detection circuit, range-measuring circuit, controller, wireless transport module and power supply module, for detect rear whether someone
Human body detection circuit and the range-measuring circuit of the distance for detecting rear object be connected respectively with controller, controller passes through
Wireless transport module is connected with mobile terminal, and power supply module is the power supply of above-mentioned all parts.The present invention by whether someone and
Distance, speed, acceleration etc. of the rear object close to user, i.e., predictable a possibility that plundering, thus by mobile whole
Realize early warning in end.
Preferably, the human body detection circuit uses infrared human body detection circuit, and infrared human body detection circuit includes attached column
Type Fresnel Lenses, pyroelectric infrared sensor and band-pass filter amplifier, half column type Fresnel Lenses are arranged in wearable dress
Surface is set, the focal point of half column type Fresnel Lenses is arranged in pyroelectric infrared sensor；Pyroelectric infrared sensor acquisition
Signal is transferred to controller after band-pass filter amplifier amplifies and filters.
Further, the pyroelectric infrared sensor includes infrared filter, double base pyroelectric sensing unit and field effect
Should pipe amplifier, infrared filter filters out non-human infrared radiation wavelength, and double base pyroelectric sensing unit detects human infrared radiation
Signal, field-effect tube amplifier are transferred to controller after amplifying the signal.
Preferably, the range-measuring circuit uses ultrasonic distance measurement circuit, and ultrasonic distance measurement circuit includes audio-frequency amplifier, surpasses
Pinger, ultrasonic receiver, amplifier and phaselocked loop, controller control generate ultrasonic signal, and audio-frequency amplifier will
Ultrasonic signal is sent to ultrasonic transmitter after carrying out Audio power amplifier, ultrasonic transmitter be transmitted to behind area
Domain；Ultrasonic receiver receives echo-signal is input to controller through phaselocked loop detection again after amplifier amplifies and filters.
Preferably, the wireless transport module uses bluetooth module.
Preferably, the power supply module includes rechargeable battery and charging circuit, the charging circuit include power supply circuit and
Charge USB interface, and rechargeable battery is all parts power supply in wearable device by power supply circuit；It is examined by two divider resistances
The voltage of rechargeable battery is surveyed, voltage signal is sent to controller.Battery status is carried out on mobile terminal APP so as to realize
Monitoring.
Preferably, the wearable device is equipped with a clip.Wearable device can be clipped in body by the clip
On the knapsack face at rear portion or on knapsack straps.
Further, the wearable device uses hemispherical dome structure, and clip is arranged in hemispheric bottom.So that red
Outer human body detection circuit, ultrasonic distance measurement circuit etc. towards the back side of user, improve the precision of detection.
Preferably, the shape of wearable device shows as ornament or cartoon figure.To which discovering for suspect will not be caused,
The beauty of wearing is improved simultaneously.
Preferably, the wearable device further includes anti-riot equipment, and anti-riot equipment is the buzzer in mobile terminal, and/
Or the high-voltage electric shock device in cell-phone cover is set outside mobile terminal.When being determined as has robbery risk, mobile terminal buzzer
Alarm is issued, high-voltage electric shock device can protect in time inherently safe convenient for user.
A kind of method for early warning based on the above-mentioned wearable device with anti-snatch warning function, comprising steps of
Human infrared radiation amount behind detection is current；
Relative distance of the object relative to wearable device behind detection is current；
According to whether having human body in monitoring region behind the judgement of human infrared radiation amount, according to relative distance and its apart from change
Change, the mobile velocity and acceleration of object behind calculating；
When determine rear object be human body, and the speed of human motion be more than setting value, relative distance be less than setting value, then
It is determined as that dangerous human body is close, wearable device controls mobile terminal and carries out early warning movement.
Preferably, there are two types of working conditions for wearable device, and one is dormant states, and one is human body detection work shapes
State, the conversion of two kinds of working conditions is by mobile terminal APP software control.So as to extend as far as possible wearable device it is standby when
Between.
Preferably, in prealarming process, controller is monitored electric quantity of rechargeable battery, when electric quantity of rechargeable battery is too low
When, voltage alarm signal is transferred to mobile terminal by wireless transport module.
Preferably, the step number frequency of mobile terminal acquisition user, when being detected, controller is controlled with step number frequency
The human infrared radiation signal data of human body detection circuit probe is acquired for the period；Human body infrared of the mobile terminal to each period
Radiation signal data B is changed rate calculating, when the data variation rate △ B in continuous N number of period is positive, monitoring area behind explanation
Interior human infrared radiation signal amplitude is increasing, it is possible to have human body target in movement close to user, into ultrasound
Away from working condition；Conversely, human body target leaves user or synchronous with user in monitoring area behind being determined as, continue to visit
It surveys.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1, the wearable device of the present invention with anti-snatch warning function, can be clipped in the knapsack at body rear portion by clip
On face or on knapsack straps, can behind real-time detection monitoring area human body target, determined and robbed in advance by mobile terminal
The risk of misfortune, and the anti-riot equipment of mobile terminal, the functions such as locating alarming are opened in time, it is ensured that human body safety.
2, the present invention realizes initialization through mobile terminal APP in conjunction with human body detection and the technology of ultrasonic distance measurement
Working condition can monitor charged battery voltage automatically.Whether there is by person of modern times monitoring region behind the identification of human body detection working condition
Body, ultrasonic distance measurement working condition further detect that the distance of close human body target, velocity and acceleration identify human body mesh
Mark the degree of danger to user.
Detailed description of the invention
Fig. 1 (a), (b) are respectively the front view and side view of the present embodiment wearable device contour structures.
Fig. 2 is the internal circuit compositional block diagram of the present embodiment wearable device.
Fig. 3 is the work flow diagram of the present embodiment wearable device.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment
A kind of wearable device with anti-snatch warning function of the present embodiment, at hemispherical dome structure, such as Fig. 1 (a), (b) institute
Show, appearance may be designed to several centimetres of diameter of less attractive ornament or cartoon figure.Wearable device includes human body
Detection circuit, range-measuring circuit, controller, wireless transport module and power supply module, wherein human body detection circuit and range-measuring circuit
It is connected respectively with controller, controller is connected by wireless transport module with mobile terminal, and power supply module is above-mentioned all parts
Power supply.With reference to the accompanying drawing 2, between the structures of all parts, component connection relationship and working principle be specifically described.
One, human body detection circuit
Human body detection circuit uses infrared human body detection circuit in the present embodiment, whether has human body for region behind detecting
In the presence of with human body overall radiation data.Amplify including half column type Fresnel Lenses 1, pyroelectric infrared sensor 2 and bandpass filtering
Device.
(1) half column type Fresnel Lenses
Half column type Fresnel Lenses is detected for pyroelectric infrared human body, and primarily serve two effects: one is to focus to make
With, by the infrared ray of human body radiation focus on pyroelectric infrared sensor sensitivity member on, thus increase rpyroelectric infrared detection
The induction visual field and distance of reaction of device, another effect are that the induction visual field of pyroelectric infrared sensor is carried out light and shade subregion,
Continuously varying analog signal can be generated when there is human body by sensor detection areas behind, and subsequent conditioning circuit is facilitated to acquire people
Body ir radiation data and identification.
(2) pyroelectric infrared sensor
Pyroelectric infrared sensor for realizing human infrared radiation signal detection.Pyroelectric infrared sensor is by infrared
Filter, double base pyroelectric sensing unit and field-effect tube amplifier composition.
Infrared filter is used to filter out the infra-red radiation other than 5-14 mum wavelength, only allows human infrared radiation wavelength that can act on
In double base pyroelectric sensing unit, to generate pyroelectric signal, guarantee that pyroelectric infrared sensor is able to detect that human body infrared
Radiation.
Double base pyroelectric sensing unit effectively detects infrared radiation signal for inhibiting influence caused by environment temperature
Fluctuation, complete operation human infrared radiation signal detection.Double base is exactly by two pyroelectric sensing unit differential concatenations
Structure, when region behind no human body enters, two sensing units are connected with opposite polarity, since ambient temperature effect is produced
Raw charge cancellation, Non voltage output, sensor Non voltage output；When there is static human body in region behind, it is irradiated to two senses
It answers the infrared energy on unit equal, the opposite charge of equivalent is generated on sensing unit, sensor is still without voltage
Output.Under light or sunlight, also due to generating the opposite charge of equivalent on sensing unit, sensor is still without voltage
Output；When having human body when region behind is mobile, the infra-red radiation that human body generates makes to receive on two sensing units infrared
The energy of radiation is different, generates different voltage on sensing unit, sensor then exports electric signal.
Field-effect tube amplifier is used for the human infrared radiation signal for detecting the sensing unit of pyroelectric infrared sensor
It amplifies.
The type of pyroelectric infrared sensor selects LHI968, and within the scope of 0.01-10Hz, response rate compares the sensor
Greatly.And this is consistent with frequency range when human body target proper motion, therefore the sensor is suitable for fast moving human body infrared
Radiation detection.
(3) band-pass filter amplifier
The small signal that band-pass filter amplifier is used to send pyroelectric infrared sensor is amplified and is filtered.It selects
The second level amplification of LM324 integrated operational amplifier composition and the bandpass filter of resistance capacitance composition are realized.
Two, range-measuring circuit
In the present embodiment, range-measuring circuit uses ultrasonic distance measurement circuit, and ultrasonic distance measurement circuit is for region behind measuring
Close to human body relative distance, and under the synchronization of step counting frequency, relative distance data are sent by controller and bluetooth module
To intelligent mobile terminal.Ultrasonic distance measurement circuit includes audio-frequency amplifier, ultrasonic transmitter 4, ultrasonic receiver 3, amplification
Device and phaselocked loop,
(1) audio amplifier circuit
Audio amplifier circuit is used to generate controller the ultrasonic signal that frequency is 25KHz and carries out Audio power amplifier,
Select the audio amplifier circuit of model LM386.
(2) ultrasonic transmitter and ultrasonic receiver
Ultrasonic transmitter is for region behind being emitted to certain power, the ultrasonic signal that frequency is 25KHz；Ultrasound
Wave receiver for receive transmitter be emitted to behind behind region, pass through the echo-signal close to human body reflection.Ultrasonic wave transmitting
Device and ultrasonic receiver are all made of model USO16T-25MPW ultrasonic probe, and a diameter of 16MM's, frequency 25KHz is super
Sonic probe.
(3) amplifier
The echo-signal that amplifier is used to send ultrasonic receiver is amplified and is filtered.Select the integrated fortune of LM324
The bandpass filter of the level-one amplification and resistance capacitance composition of calculating amplifier composition is realized.
(4) phaselocked loop
The ultrasonic echo for the 25KHz that phaselocked loop is used to export in amplifier carries out detection, when the ultrasound for detecting 25KHz
When wave echo-signal, output end becomes high level from original low level, and output end is connected with the middle broken ends of fractured bone of controller, when
When receiving high level, the counter of controller stops counting, and is scaled time t according to counter, can be counted according to formula S=vt/2
Testing distance S is calculated, v is the velocity of sound, and t is the time measured.The phase-locked loop circuit of phaselocked loop selection model LM567.
Three, controller
In the present embodiment, controller is mainly used for completing following functions:
(1) the open command wake-up circuitry that mobile terminal is sent is received by bluetooth module to be converted by dormant state
For human body detection operations state.
(2) the step number frequency for the user that mobile terminal is sent is received by bluetooth module.Using step number frequency as the period,
The human infrared radiation signal data of pyroelectric infrared sensor detection is acquired, and intelligent mobile end is transferred to by bluetooth module
End.
(3) distance measuring instruction that mobile terminal is sent is received by bluetooth module.Ultrasonic distance measurement working condition is opened, it will
The range data of the human body relative usage person continuously measured, is transferred to intelligent mobile terminal by bluetooth module.
(4) ultrasonic signal is generated.Controller by leads ends output pulse width is 40/ μ s, the ultrasound that carrier wave is 25kHz
Wave impulse string pushes ultrasonic transmitter to launch through audio-frequency amplifier.The reflectance ultrasound that ultrasonic receiver will receive
Wave is sent to amplifier and amplifies, and then carries out detection with phaselocked loop.
(5) battery capacity is monitored.When electric quantity of rechargeable battery is too low, voltage alarm signal is transferred to by bluetooth module
Intelligent mobile terminal.
IAP15W4K58S4 single-chip microcontroller can be selected in controller when practical application, and IAP15W4K58S4 single-chip microcontroller is STC Corporation
The single-chip microcontroller of single clock/machine cycle (1T) of production is Width funtion/high speed/highly reliable/low-power consumption/super strongly disturbing new one
For MCU.IAP15W4K58S4 has 8 road CCP/PWM/PCA, 8 10, tunnel high-speed a/ds, built-in 4KB large capacity SRAM, 4 groups of superelevation
Speed asynchronous serial communication port and 1 group of high-speed synchronous communication port SPI, its supply voltage is very wide, between 2.5-5.5V
It can work normally.
Four, wireless transport module
In the present embodiment, wireless transport module uses bluetooth module, and bluetooth module is for completing controller and mobile terminal
Between data transparent transmission.TELESKY HC-05 bluetooth module can be selected in practical application, which has the function of perfect
And outstanding feature, USB port, built-in 2.4GHZ small size antenna, standard hardware configuration of the UART as system.Simultaneously
System power dissipation is relatively low, and current value is less than 1mA, small volume under dormant state, and operating voltage only has 3.3V.
Five, power supply module
In the present embodiment, power supply module includes rechargeable battery 5 and charging circuit, and charging circuit includes power supply circuit and charging
USB interface 7.The USB interface that charges is used for external+5V DC power supply, can be by connecing the interface in Switching Power Supply charger, charger baby
Power supply line access Deng on.Rechargeable battery access in parallel with the+5V DC power supply that charging USB interface is brought, can be directly to electricity
While pond is charged, power supply module power supply is returned.
It when external charge USB interface is not powered, is powered from rechargeable battery to power supply module, and passes through two divider resistances
The voltage of rechargeable battery is sent into the AD conversion end of controller, collected battery voltage data is passed through bluetooth module by controller
It is sent to mobile terminal APP.When cell voltage is low and certain value, APP generates the insufficient alarm prompt of battery capacity.
In the present embodiment, rechargeable battery selects lithium battery.Power supply circuit is used for the+5V DC voltage for being sent into USB interface
Or battery power voltage is converted to+3.3V DC voltage, powers for circuitry, selects the integrated electricity of MCP1700 type three-terminal voltage-stabilizing
Road.
The wearable device further includes anti-riot equipment, and anti-riot equipment includes buzzer in mobile terminal as alarm
With the dedicated cell-phone cover being mounted on outside mobile terminal, high-voltage electric shock device is housed on the dedicated cell-phone cover, battery and with it is mobile eventually
The data line that end data interface is connected, when being determined as has robbery risk, mobile terminal buzzer issues alarm, and passes through
APP software, which issues, opens the anti-riot device directive of mobile terminal, and the data line being connected through mobile terminal data interface is transferred to shifting
The dynamic anti-riot equipment of terminal, opens high-voltage electric shock device, guarantees that user can timely use, to protect inherently safe.
Moulding as one preferred, referring to Fig. 1 (a), the present embodiment can be by circular ultrasonic transmitter and reception
Device is mounted on the top two sides of hemispherical wearable device, is made into the eye of cartoon figure；Half column type Fresnel Lenses is mounted on half
The lower section of spherical wearable device is made into the mouth of cartoon figure.It is equipped with clip 6 in wearable device plane side, clip is used for
Wearable device is fixed on knapsack and faces rear direction.All circuit components are welded on circuit board 8.Rpyroelectric infrared passes
Sensor is mounted on the focal point of half column type Fresnel Lenses.Charging USB interface is for realizing external charger to wearable device
Internal rechargeable battery charging.Rechargeable battery is mounted on the rear portion of circuit board.
The implementation method of the anti-snatch warning function of wearable device described in the present embodiment is: by the software on mobile terminal
APP issues starting antirobbing function to bluetooth module, and wearable device is with monitoring section behind the judgement of its infrared human body detection circuit
Whether domain has human body, mobile terminal will be sent to by human infrared radiation amount data B behind by controller and bluetooth module, by moving
Dynamic terminal APP calculates △ B change rate, determines whether there is movement human behind.Wearable device passes through ultrasound
Go out away from circuit counting close to human body relative distance, relative distance data are sent to eventually by movement by controller and bluetooth module
End calculates the speed, acceleration close to human motion by mobile terminal APP, when speed and apart from being more than setting value, is determined as
Dangerous human body is close, and APP software starts buzzer and issues alarm and the anti-riot equipment of mobile terminal, information, locating alarming etc.
Function, it is ensured that user's human body safety.The course of work is divided into three working conditions, and flow chart is as shown in Figure 3.
1. initial work state
Initial work state is for starting wearable device and monitoring charged battery voltage.When on opening mobile terminal
After software APP, mobile terminal issues wake up instruction to wearable device bluetooth module by the bluetooth module of itself, and starts control
The voltage of rechargeable battery will be sent into the A/D end of convert of controller, controller by device work processed, controller by two divider resistances
Collected battery voltage data is sent to intelligent mobile terminal APP by bluetooth module, when cell voltage is lower than certain value
When, APP generates the insufficient alarm prompt of battery capacity；When cell voltage is normal, then enter human body detection working condition.
2. human body detection working condition
Whether monitoring region has close human body to human body detection working condition behind for identification.Wearable device is with using
Person's walking movement is stationary, measures user's by the acceleration transducer of itself by software APP on mobile terminal
Motion state calls step counting to resolve module, and the step counting frequency of actual measurement is controlled by being transmitted on wearable device under bluetooth module
Device.When user remains static, then software APP uploads the step counting frequency of previous measurement, it is ensured that controller is using
Person has collection period under motion and standstill state.Controller is then using step counting frequency as the period, behind meter step period acquisition
Human infrared radiation signal data B in monitoring area, is uploaded to intelligent mobile terminal by bluetooth module, by intelligent mobile terminal
It is changed rate to the human infrared radiation signal data B in each period to calculate, when the data △ B change rate in continuous N number of period
It is positive, the human infrared radiation signal amplitude behind explanation in monitoring area is increasing, it is possible to have human body target to connect in movement
Nearly user, into ultrasonic distance measurement working condition；Conversely, behind being determined as in monitoring area human body target leave user or
It is synchronous with user, then continue to detect.
3. ultrasonic distance measurement working condition
Ultrasonic distance measurement working condition is used to further detect the distance of close human body target, velocity and acceleration,
Identify human body target to the degree of danger of user.It is sent to ultrasonic distance measurement circuit by the ultrasonic signal that controller generates,
It is calculated again by controller close to human body relative distance S, relative distance data S is sent to intelligent mobile end by bluetooth module
End calculates speed V, acceleration a close to human motion by mobile terminal APP, when speed V is more than setting value, and accelerates a
> 0, it is close to be determined as dangerous human body, and APP starts the functions such as the anti-riot equipment of mobile terminal, information, locating alarming, it is ensured that uses
Person's human body safety；Conversely, then returning to human body detection working condition.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of wearable device with anti-snatch warning function, which is characterized in that including human body detection circuit, range-measuring circuit,
Controller, wireless transport module and power supply module, for detect rear whether someone human body detection circuit and for detecting
The range-measuring circuit of the distance of rear object is connected with controller respectively, and controller passes through wireless transport module and mobile terminal phase
Even, power supply module is the power supply of above-mentioned all parts.
2. the wearable device according to claim 1 with anti-snatch warning function, which is characterized in that
The human body detection circuit uses infrared human body detection circuit, and infrared human body detection circuit includes that half column type Fresnel is saturating
Mirror, pyroelectric infrared sensor and band-pass filter amplifier, half column type Fresnel Lenses are arranged on wearable device surface, and heat is released
The focal point of half column type Fresnel Lenses is arranged in electric infrared sensor；The signal of pyroelectric infrared sensor acquisition is filtered through band logical
Controller is transferred to after twt amplifier amplification and filtering.
3. the wearable device according to claim 2 with anti-snatch warning function, which is characterized in that the pyroelectricity is red
Outer sensor includes infrared filter, double base pyroelectric sensing unit and field-effect tube amplifier, and infrared filter filters out non-human red
External radiation wavelength, double base pyroelectric sensing unit detect human infrared radiation signal, and field-effect tube amplifier amplifies the signal
After be transferred to controller.
4. the wearable device according to claim 1 with anti-snatch warning function, which is characterized in that the range-measuring circuit
Using ultrasonic distance measurement circuit, ultrasonic distance measurement circuit includes audio-frequency amplifier, ultrasonic transmitter, ultrasonic receiver, puts
Big device and phaselocked loop, controller control generate ultrasonic signal, and ultrasonic signal is carried out Audio power amplifier by audio-frequency amplifier
After be sent to ultrasonic transmitter, ultrasonic transmitter be transmitted to behind region；Ultrasonic receiver receives echo-signal,
Controller is input to through phaselocked loop detection again after amplifier amplifies and filters.
5. the wearable device according to claim 1 with anti-snatch warning function, which is characterized in that it is preferred, it is described
Power supply module includes rechargeable battery and charging circuit, and the charging circuit includes power supply circuit and charging USB interface, rechargeable battery
It is all parts power supply in wearable device by power supply circuit；The voltage of rechargeable battery, electricity are detected by two divider resistances
Pressure signal is sent to controller.
6. the wearable device according to claim 1 with anti-snatch warning function, which is characterized in that the wearable dress
It sets and is equipped with a clip.
7. the wearable device according to claim 6 with anti-snatch warning function, which is characterized in that the wearable dress
It sets using hemispherical dome structure, clip is arranged in hemispheric bottom.
8. a kind of method for early warning based on the described in any item wearable devices with anti-snatch warning function of claim 1-7,
Characterized in that it comprises the following steps:
Human infrared radiation amount behind detection is current；
Relative distance of the object relative to wearable device behind detection is current；
According to whether having human body in monitoring region behind the judgement of human infrared radiation amount, according to relative distance and its distance change,
The mobile velocity and acceleration of object behind calculating；
When determine rear object be human body, and the speed of human motion be more than setting value, relative distance be less than setting value, then determine
Close for dangerous human body, wearable device controls mobile terminal and carries out early warning movement.
9. method for early warning according to claim 8, which is characterized in that working condition that there are two types of wearable devices, one is
Dormant state, one is human body detection working conditions, and the conversion of two kinds of working conditions is by mobile terminal APP software control；
In prealarming process, controller is monitored electric quantity of rechargeable battery, when electric quantity of rechargeable battery is too low, by voltage alarm
Signal is transferred to mobile terminal by wireless transport module.
10. method for early warning according to claim 8, which is characterized in that mobile terminal acquires the step number frequency of user,
When being detected, controller control acquires the human infrared radiation signal number of human body detection circuit probe using step number frequency as the period
According to；Mobile terminal is changed rate to the human infrared radiation signal data B in each period and calculates, when the number in continuous N number of period
It is positive according to change rate △ B, the human infrared radiation signal amplitude behind explanation in monitoring area is increasing, it is possible to have human body mesh
Movement is marked on close to user, into ultrasonic distance measurement working condition；Conversely, behind being determined as in monitoring area human body target from
User or synchronous with user is opened, continues to detect.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811228063.7A CN109300280A (en) | 2018-10-22 | 2018-10-22 | A kind of wearable device and its method for early warning with anti-snatch warning function |
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