CN105139662A - Motor vehicle driving speed measurement device based on bluetooth technology and method for operating the device - Google Patents
Motor vehicle driving speed measurement device based on bluetooth technology and method for operating the device Download PDFInfo
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- CN105139662A CN105139662A CN201510505135.8A CN201510505135A CN105139662A CN 105139662 A CN105139662 A CN 105139662A CN 201510505135 A CN201510505135 A CN 201510505135A CN 105139662 A CN105139662 A CN 105139662A
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Abstract
The invention discloses a motor vehicle driving speed measurement device based on a bluetooth technology and a method for operating the device. The speed measurement device comprises an MCU U5 processor, a bluetooth circuit, a solar voltage detection circuit, an RS232 U1 interface circuit, an RS232 U2 interface circuit, a power supply circuit, an X1 crystal oscillator circuit and an X2 crystal oscillator circuit, wherein the bluetooth circuit, the solar voltage detection circuit, the RS232 U1 interface circuit, the RS232 U2 interface circuit, the power supply circuit, the X1 crystal oscillator circuit, and the X2 crystal oscillator circuit are electrically connected with the MCU U5 processor; and during the process for measuring the motor vehicle driving speed, the MCU U5 processor configures parameters for a bluetooth communication chip U4, and sets a bluetooth signal scanning mode for the bluetooth communication chip U4, and analyzes the characteristics of bluetooth signals and filters interference signals, and extracts effective motor vehicle bluetooth signals, and performs acquisition of bluetooth equipment ID and data conversion. By comparing and matching the Bluetooth IDs of a same motor vehicle obtained at an A speed measurement point and a B speed measurement point respectively, and according to the distance between the A speed measurement point and the B speed measurement point, the driving speed and the driving direction of the acquired motor vehicle can be calculated.
Description
Technical field
The present invention relates to field of traffic control, relate to the vehicle running speed determinator based on Bluetooth technology and operation method thereof specifically.
Background technology
The vehicle running speed that road travels is a significant data index of field of traffic control, is also an important indicator of traffic control, relates to traffic planninng design, motor vehicle driving safety.The art of this patent is mainly for the road automobile travel speed mensuration mode of traffic control application and the improvement of function; Existing vehicle running speed collection mainly contains geomagnetic induction coil and measures mode, radar measuring mode, laser determination mode; Wherein geomagnetic induction coil measure mode be the most frequently used mensuration mode, but this mode need cut road surface, its construction complexity and cost also relatively high; Radar measuring mode adopts higher-frequency radar ripple to carry out vehicle running speed mensuration, but its installation needs to have certain height, need to set up the suspenders such as portal frame, and radar equipment cost is higher; Laser vehicle running speed determinator and radar level gauge similar, cost also occupies high.
Summary of the invention
For deficiency of the prior art, the technical problem to be solved in the present invention there are provided vehicle running speed determinator based on Bluetooth technology and operation method thereof.
For solving the problems of the technologies described above, the present invention is realized by following scheme: based on the vehicle running speed determinator of Bluetooth technology, on the lamp stand that this speed measuring device is arranged on motor vehicles road side or other direction board cylinder, described speed measuring device comprises:
MCUU5 processor;
The Bluetooth circuit be electrically connected with MCUU5 processor, solar voltage testing circuit, RS232U1 interface circuit, RS232U2 interface circuit, power circuit, X1 crystal oscillating circuit, X2 crystal oscillating circuit;
Described MCUU5 processor connects solar panel by interface J5, carry out battery charging by metal-oxide-semiconductor T1 to control, MCUU5 processor detects solar voltage the bleeder circuit consisted of resistance R4 and resistance R9 simultaneously, and the charging completing battery controls;
Described MCUU5 processor is connected by spi bus and controls bluetooth communication chip U4, described MCUU5 processor is configured bluetooth mode parameter initialization, sensitivity parameter, and opens the motor vehicle Bluetooth signal of poll scan pattern to periphery and carry out Scanning Detction; When having scanned motor vehicle Bluetooth signal, the bluetooth ID of logging machine motor-car, and ID is encrypted conversion, record obtains the timing node information of ID simultaneously, and is stored in MCU internal RAM by ID sequence and temporal information;
Described MCUU5 processor by comparing coupling to the A point of same vehicle, the bluetooth ID of B point two, and by the spacing of A point, B point, calculates and the travel speed of the motor vehicle collected and travel direction.
Further, the model of described MCUU5 processor is MSP430F5529.
Further, the bluetooth communication chip U4 model of described Bluetooth circuit is CC2564, the SLOW_CLK end of this bluetooth communication chip U4, VSS end electrical connection X4 crystal oscillating circuit, XTALM/FREFM end, XTALP/FREFP end electrical connection X3 crystal oscillating circuit, BT_RF end electrical connection filter circuit, the other end electrical connection vehicle detection external antenna of described filter circuit.
Further, the wave filter model of described filter circuit is LFB212G45SG8A127.
Further, the interface chip model of described RS232U1 interface circuit, RS232U2 interface circuit is MAX3232ESE.
Further, being electrically connected with model in the circuit of described power circuit is AMS1117-3.3 voltage stabilizer.
Further, the crystal resonator that model is 32.768KHZ is electrically connected with in the circuit of described X1 crystal oscillating circuit, these crystal resonator two ends are electrically connected the XIN end of MCUU5 processor respectively, XOUT holds, these crystal resonator two ends are also electrically connected with 12PF electric capacity C31 respectively, 12PF electric capacity C32, electric capacity C31, the other end ground connection of electric capacity C32, the crystal resonator that model is 16MHZ is electrically connected with in the circuit of described X2 crystal oscillating circuit, these crystal resonator two ends are electrically connected the XIN end of MCUU5 processor respectively, XOUT holds, these crystal resonator two ends are also electrically connected with 47PF electric capacity C30 respectively, 47PF electric capacity C33, electric capacity C30, the other end ground connection of electric capacity C33.
Based on an operation method for the vehicle running speed determinator of Bluetooth technology, the method comprises the following steps:
1), MCUU5 processor connected by spi bus and controls bluetooth communication chip U4,
2), choose arbitrary motor vehicles, the A speed measuring point of setting vehicle on traffic direction and B speed measuring point, MCUU5 processor carries out MCU initialization at A speed measuring point and carries out MCU initialization at A speed measuring point simultaneously;
3), MCUU5 processor unlatching bluetooth carries out multiple mode scanning between two speed measuring points;
4), motor vehicles bluetooth ID is found:
MCUU5 processor scans the vehicle on motor-driven road by bluetooth, and by the Bluetooth signal in bluetooth junctor motor vehicle, described MCUU5 processor can filter out the bluetooth interference signal of non-maneuver and periphery, extracts effective motor vehicle Bluetooth signal;
When having scanned motor vehicle Bluetooth signal, the bluetooth ID of logging machine motor-car, and ID is encrypted conversion, record obtains the timing node information of ID simultaneously;
5) the bluetooth ID Strength Changes, detecting vehicle judges vehicle ID;
6), bluetooth ID is carried out A queue storage and B queue storage by MCUU5 processor;
7), A queue, B queue are compared by polling mode by MCUU5 processor;
8), the initial entry time of A queue, the identical bluetooth ID of B queue found by MCUU5 processor;
9), the termination entry time of A queue, the identical bluetooth ID of B queue found by MCUU5 processor;
10), MCUU5 processor filters out the bluetooth ID do not mated;
11), the distance computation between the mistiming of identical bluetooth ID and A speed measuring point, B speed measuring point is gone out the speed of this bluetooth ID vehicle by MCUU5 processor.
9. the operation method of a kind of vehicle running speed determinator based on Bluetooth technology according to claim 9, it is characterized in that step 11), the computing formula in step 11) is:
V=L/T；
Wherein, V represents car speed, and L represents the spacing between A speed measuring point, B speed measuring point, and T represents the mistiming of the identical bluetooth ID of vehicle.
Relative to prior art, the invention has the beneficial effects as follows:
1. vehicle running speed measures and adopts brand-new design theory, introduce Bluetooth technology, the Bluetooth signal of the mobile device used of passenger on the carried on vehicle bluetooth that road travels or motor vehicle is gathered, and record the ID of bluetooth equipment, the identical ID gathered by 2 carries out matching operation, thus measures the speed of motor-driven vehicle going.
2. adopt multimode bluetooth technology, comprehensively compatibility 4.0 and following bluetooth equipment communication, and the present invention's employing is low-power-consumption embedded MCU treatment technology and Bluetooth technology, the electrical source consumption reducing device maximum under fully meeting the prerequisite of the requirement of performance.
3. what the present invention innovated motor vehicles travel speed mensuration introduces differencing check and fuzzy algorithm, effectively eliminates the interference of bicycle Bluetooth signal to this device, improves reliability and the accuracy of vehicle running speed mensuration greatly.
4. the present invention is reaching traditional approach under the effect prerequisite of the motor vehicle speed mensuration that road travels, that innovates employs bluetooth new technology, original speed measuring device cost is reduced greatly, simultaneously, by low power dissipation design, great simplification is done to the technological process of system power supply construction, installation.Meanwhile, this device adopts the bluetooth of two somes combination to measure mode, by adjusting the spacing of two points, thus the estimating precision of vehicle running speed of maximized raising, reach the precision determination of 0.01km/h.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the operation logic block diagram of the vehicle running speed determinator that the present invention is based on Bluetooth technology.
Fig. 2 is the exemplary plot of speed measuring device of the present invention.
Fig. 3 is MCUU5 processor circuit figure of the present invention.
Fig. 4 is X4 crystal oscillating circuit figure of the present invention.
Fig. 5 is Bluetooth circuit figure of the present invention.
Fig. 6 is the X3 crystal oscillating circuit figure that is connected with Bluetooth circuit of the present invention and filter circuit figure.
Fig. 7 is solar voltage testing circuit figure of the present invention.
Fig. 8 is RS232U2 interface circuit of the present invention.
Fig. 9 is RS232U1 interface circuit of the present invention.
Figure 10 is power circuit diagram of the present invention.
Figure 11 is X1 crystal oscillating circuit figure of the present invention.
Figure 12 is X2 crystal oscillating circuit figure of the present invention.
Mark in accompanying drawing: MCUU5 processor 1, X4 crystal oscillating circuit 2, Bluetooth circuit 3, filter circuit 4 solar voltage testing circuit 5, RS232U2 interface circuit 6, RS232U1 interface circuit 7, power circuit 8, X1 crystal oscillating circuit 9, X2 crystal oscillating circuit 10.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Please refer to accompanying drawing 3 ~ 12, the vehicle running speed determinator based on Bluetooth technology of the present invention, on the lamp stand that this speed measuring device is arranged on motor vehicles road side or other direction board cylinder, described speed measuring device comprises:
MCUU5 processor 1, the model of described MCUU5 processor 1 is MSP430F5529.
The Bluetooth circuit 3 be electrically connected with MCUU5 processor 1, solar voltage testing circuit 5, RS232U1 interface circuit 7, RS232U2 interface circuit 6, power circuit 8, X1 crystal oscillating circuit 9, X2 crystal oscillating circuit 10;
As shown in Figure 5, described MCUU5 processor 1 connects solar panel by interface J5, carry out battery charging by metal-oxide-semiconductor T1 to control, MCUU5 processor 1 detects solar voltage the bleeder circuit consisted of resistance R4 and resistance R9 simultaneously, and the charging completing battery controls; Charging is stopped when closing T1 after full electricity.
Described MCUU5 processor 1 is connected by spi bus and controls bluetooth communication chip U4, described MCUU5 processor 1 pair of bluetooth mode parameter initialization, sensitivity parameter are configured, and open the motor vehicle Bluetooth signal of poll scan pattern to periphery and carry out Scanning Detction; When having scanned motor vehicle Bluetooth signal, the bluetooth ID of logging machine motor-car, and ID is encrypted conversion, record obtains the timing node information of ID simultaneously, and is stored in MCU internal RAM by ID sequence and temporal information; Described MCUU5 processor 1 by comparing coupling to the A point of same vehicle, the bluetooth ID of B point two, and by the spacing of A point, B point, calculates and the travel speed of the motor vehicle collected and travel direction.
As shown in Figure 4, the bluetooth communication chip U4 model of described Bluetooth circuit 3 is CC2564, the SLOW_CLK end of this bluetooth communication chip U4, VSS end electrical connection X4 crystal oscillating circuit 2, XTALM/FREFM end, XTALP/FREFP end electrical connection X3 crystal oscillating circuit, BT_RF end electrical connection filter circuit 4, the other end electrical connection vehicle detection external antenna of described filter circuit 4, the wave filter model of this filter circuit 4 is LFB212G45SG8A127.
As shown in Fig. 8 ~ 9, the interface chip model of described RS232U1 interface circuit 7, RS232U2 interface circuit 6 is MAX3232ESE.
As shown in Figure 10, being electrically connected with model in the circuit of described power circuit 8 is AMS1117-3.3 voltage stabilizer, and system becomes 3.3V direct current to power to system by entering voltage stabilizer voltage stabilizing after accumulator.
As shown in Figure 11 ~ 12, the crystal resonator that model is 32.768KHZ is electrically connected with in the circuit of described X1 crystal oscillating circuit 9, these crystal resonator two ends are electrically connected the XIN end of MCUU5 processor 1 respectively, XOUT holds, these crystal resonator two ends are also electrically connected with 12PF electric capacity C31 respectively, 12PF electric capacity C32, electric capacity C31, the other end ground connection of electric capacity C32, the crystal resonator that model is 16MHZ is electrically connected with in the circuit of described X2 crystal oscillating circuit 10, these crystal resonator two ends are electrically connected the XIN end of MCUU5 processor 1 respectively, XOUT holds, these crystal resonator two ends are also electrically connected with 47PF electric capacity C30 respectively, 47PF electric capacity C33, electric capacity C30, the other end ground connection of electric capacity C33.
As shown in Figure 1 and 2, a kind of operation method of the vehicle running speed determinator based on Bluetooth technology, the method comprises the following steps:
1, MCUU5 processor 1 is connected by spi bus and controls bluetooth communication chip U4,
2, choose arbitrary motor vehicles, the A speed measuring point of setting vehicle on traffic direction and B speed measuring point, MCUU5 processor 1 carries out MCU initialization at A speed measuring point and carries out MCU initialization at A speed measuring point simultaneously;
3, MCUU5 processor 1 is opened bluetooth carry out multiple mode scanning between two speed measuring point;
4, motor vehicles bluetooth ID is found:
MCUU5 processor 1 scans the vehicle on motor-driven road by bluetooth, and by the Bluetooth signal in bluetooth junctor motor vehicle, described MCUU5 processor 1 can filter out the bluetooth interference signal of non-maneuver and periphery, extracts effective motor vehicle Bluetooth signal;
When having scanned motor vehicle Bluetooth signal, the bluetooth ID of logging machine motor-car, and ID is encrypted conversion, record obtains the timing node information of ID simultaneously;
5, the bluetooth ID Strength Changes detecting vehicle judges vehicle ID;
6, bluetooth ID is carried out A queue storage and B queue storage by MCUU5 processor 1;
7, A queue, B queue are compared by polling mode by MCUU5 processor 1;
8, the initial entry time of A queue, the identical bluetooth ID of B queue found by MCUU5 processor 1;
9, the termination entry time of A queue, the identical bluetooth ID of B queue found by MCUU5 processor 1;
10, MCUU5 processor 1 filters out the bluetooth ID do not mated;
11, the distance computation between the mistiming of identical bluetooth ID and A speed measuring point, B speed measuring point is gone out the speed of this bluetooth ID vehicle by MCUU5 processor 1.
It is characterized in that step 11, the computing formula in step 11 is:
V=L/T；
Wherein, V represents car speed, and L represents the spacing between A speed measuring point, B speed measuring point, and T represents the mistiming of the identical bluetooth ID of vehicle.If L is 20 meters, T's is 2 seconds, and therefore V's is exactly 10 meter per seconds, but the speed per hour of vehicle be generally km/time, therefore, the numerical value of T is 36.
The present invention is the bluetooth equipment utilizing its vehicle-mounted or passengers in vehicle of vehicle that road travels to carry, and by Bluetooth technology, by the bluetooth measured signal mistiming between 2 o'clock, calculates the speed of motor-driven vehicle going, without the need to specific installation member; For the velocity determination of motor vehicle, adopt Bluetooth signal to carry out detection to measure, for passive reception mensuration mode, therefore possess the features such as low-power consumption, ease for use, installation facility, the novel automobile travel speed being applicable to very much substituting conventional motor vehicle velocity determination mode measures mode.For the shortcoming of existing vehicle running speed determinator, propose to improve as follows:
1. improve the mounting means of vehicle running speed determinator, this speed measuring device is changed into roadside by the specific rod member of traditional needs and pavement construction mode and is installed flexibly, speed measuring device of the present invention can be fixed on street lamp post or guideboard support, without the need to feature rod member.
2. car speed determinator of the present invention adopts low power dissipation design, and change traditional power supply mode, adopt solar powered mode, applying flexible is efficient.
3. adopt the travel speed of passive Bluetooth technology to motor vehicle to measure, therefore low cost effect is possessed, after reaching traditional vehicle speed measuring device same performance, vehicle determinator cost of the present invention is 1/10 of magnetic coil car speed determinator cost traditionally, be conventional radar test the speed 1/20.
4. car speed determinator of the present invention adopts low-power-consumption embedded MCU to design, and all devices adopt technical grade design standards, under round-the-clockly can being operated in various temperature and weather environment, compare traditional approach, have environmental suitability very.
Car speed determinator of the present invention carries out sampling analysis by the input voltage of MCUU5 processor 1 to power supply solar panels, and when accumulator electric-quantity does not reach Full Charge Capacity time, MCUU5 processor 1 controls solar cell and charges to accumulator; When after accumulator electric-quantity full state, MCUU5 processor 1 disconnects solar recharging, and protection accumulator is avoided overcharging.When battery discharging voltage reaches lower limit, MCUU5 processor 1 control system enters dormant state, and protection accumulator is crossed and put.
When carrying out motor vehicle speed and measuring, parameter configuration is carried out by MCUU5 processor 1 couple of bluetooth communication chip U4, Bluetooth signal scan pattern is entered after setting the running parameter of bluetooth communication chip U4, after receiving Bluetooth signal, the feature of Bluetooth signal is analyzed, filter out the bluetooth interference signal of non-maneuver and periphery, extract effective motor vehicle Bluetooth signal, and carry out bluetooth equipment ID collection and data transformation.Separately coupling is compared to the bluetooth ID of same motor vehicle by A speed measuring point, B speed measuring point, and by A speed measuring point, B speed measuring point spacing, calculate travel speed and the travel direction of the motor vehicle collected.
The foregoing is only the preferred embodiment of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (9)
1., based on the vehicle running speed determinator of Bluetooth technology, on the lamp stand that this speed measuring device is arranged on motor vehicles road side or other direction board cylinder, it is characterized in that, described speed measuring device comprises:
MCUU5 processor (1);
The Bluetooth circuit (3) be electrically connected with MCUU5 processor (1), solar voltage testing circuit (5), RS232U1 interface circuit (7), RS232U2 interface circuit (6), power circuit (8), X1 crystal oscillating circuit (9), X2 crystal oscillating circuit (10);
Described MCUU5 processor (1) connects solar panel by interface J5, carry out battery charging by metal-oxide-semiconductor T1 to control, MCUU5 processor (1) detects solar voltage the bleeder circuit consisted of resistance R4 and resistance R9 simultaneously, and the charging completing battery controls;
Described MCUU5 processor (1) is connected by spi bus and controls bluetooth communication chip U4, described MCUU5 processor (1) is configured bluetooth mode parameter initialization, sensitivity parameter, and opens the motor vehicle Bluetooth signal of poll scan pattern to periphery and carry out Scanning Detction; When having scanned motor vehicle Bluetooth signal, the bluetooth ID of logging machine motor-car, and ID is encrypted conversion, record obtains the timing node information of ID simultaneously, and is stored in MCU internal RAM by ID sequence and temporal information;
Described MCUU5 processor (1) by comparing coupling to the A point of same vehicle, the bluetooth ID of B point two, and by the spacing of A point, B point, calculates and the travel speed of the motor vehicle collected and travel direction.
2. the vehicle running speed determinator based on Bluetooth technology according to claim 1, is characterized in that: the model of described MCUU5 processor (1) is MSP430F5529.
3. the vehicle running speed determinator based on Bluetooth technology according to claim 1, it is characterized in that: the bluetooth communication chip U4 model of described Bluetooth circuit (3) is CC2564, the SLOW_CLK end of this bluetooth communication chip U4, VSS end electrical connection X4 crystal oscillating circuit (2), XTALM/FREFM end, XTALP/FREFP end electrical connection X3 crystal oscillating circuit, BT_RF end electrical connection filter circuit (4), the other end electrical connection vehicle detection external antenna of described filter circuit (4).
4. the vehicle running speed determinator based on Bluetooth technology according to claim 3, is characterized in that: the wave filter model of described filter circuit (4) is LFB212G45SG8A127.
5. the vehicle running speed determinator based on Bluetooth technology according to claim 1, is characterized in that: the interface chip model of described RS232U1 interface circuit (7), RS232U2 interface circuit (6) is MAX3232ESE.
6. the vehicle running speed determinator based on Bluetooth technology according to claim 1, is characterized in that: being electrically connected with model in the circuit of described power circuit (8) is AMS1117-3.3 voltage stabilizer.
7. the vehicle running speed determinator based on Bluetooth technology according to claim 1, it is characterized in that: in the circuit of described X1 crystal oscillating circuit (9), be electrically connected with the crystal resonator that model is 32.768KHZ, these crystal resonator two ends are electrically connected the XIN end of MCUU5 processor (1) respectively, XOUT holds, these crystal resonator two ends are also electrically connected with 12PF electric capacity C31 respectively, 12PF electric capacity C32, electric capacity C31, the other end ground connection of electric capacity C32, the crystal resonator that model is 16MHZ is electrically connected with in the circuit of described X2 crystal oscillating circuit (10), these crystal resonator two ends are electrically connected the XIN end of MCUU5 processor (1) respectively, XOUT holds, these crystal resonator two ends are also electrically connected with 47PF electric capacity C30 respectively, 47PF electric capacity C33, electric capacity C30, the other end ground connection of electric capacity C33.
8., with an operation method for the vehicle running speed determinator based on Bluetooth technology according to claim 1, it is characterized in that, the method comprises the following steps:
1), MCUU5 processor (1) connected by spi bus and controls bluetooth communication chip U4,
2), choose arbitrary motor vehicles, the A speed measuring point of setting vehicle on traffic direction and B speed measuring point, MCUU5 processor (1) carries out MCU initialization at A speed measuring point and carries out MCU initialization at A speed measuring point simultaneously;
3), MCUU5 processor (1) unlatching bluetooth carries out multiple mode scanning between two speed measuring points;
4), motor vehicles bluetooth ID is found:
MCUU5 processor (1) scans the vehicle on motor-driven road by bluetooth, and by the Bluetooth signal in bluetooth junctor motor vehicle, described MCUU5 processor (1) can filter out the bluetooth interference signal of non-maneuver and periphery, extracts effective motor vehicle Bluetooth signal;
When having scanned motor vehicle Bluetooth signal, the bluetooth ID of logging machine motor-car, and ID is encrypted conversion, record obtains the timing node information of ID simultaneously;
5) the bluetooth ID Strength Changes, detecting vehicle judges vehicle ID;
6), bluetooth ID is carried out A queue storage and B queue storage by MCUU5 processor (1);
7), A queue, B queue are compared by polling mode by MCUU5 processor (1);
8), the initial entry time of A queue, the identical bluetooth ID of B queue found by MCUU5 processor (1);
9), the termination entry time of A queue, the identical bluetooth ID of B queue found by MCUU5 processor (1);
10), MCUU5 processor (1) filters out the bluetooth ID do not mated;
11), the distance computation between the mistiming of identical bluetooth ID and A speed measuring point, B speed measuring point is gone out the speed of this bluetooth ID vehicle by MCUU5 processor (1).
9. the operation method of a kind of vehicle running speed determinator based on Bluetooth technology according to claim 9, it is characterized in that step 11), the computing formula in step 11) is:
V=L/T；
Wherein, V represents car speed, and L represents the spacing between A speed measuring point, B speed measuring point, and T represents the mistiming of the identical bluetooth ID of vehicle.
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| CN105139662B (en) | 2017-06-16 |
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