CN105137124A - High-precision highway speedometer calibration device - Google Patents
High-precision highway speedometer calibration device Download PDFInfo
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- CN105137124A CN105137124A CN201510333671.4A CN201510333671A CN105137124A CN 105137124 A CN105137124 A CN 105137124A CN 201510333671 A CN201510333671 A CN 201510333671A CN 105137124 A CN105137124 A CN 105137124A
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Abstract
A high-precision highway speedometer calibration device comprises a high-precision real-time clock module, a data processor module, a non-contact displacement sensor, and an LED. The high-precision real-time clock module is connected with the data processor module, and the data processor module is connected with the non-contact displacement sensor and the LED. The beneficial effects are as follows: a real-time clock with high display precision and high accuracy is realized, and the real time is displayed on a real time display module of the LED; by capturing the LED through a camera of a highway speedometer, the real time of an interval velocity measuring system can be calibrated while high-precision motor vehicle driving time is provided for calibrating the average speed measurement result of the highway speedometer; the instantaneous speed of a motor vehicle measured by the highway speedometer can be calibrated; and by adopting the high-precision real-time clock module and the high-precision non-contact displacement sensor, the measuring precision of average speed is improved, and the calibration precision of average speed measurement result is improved.
Description
Technical field
The invention belongs to technology of instrument and meter field, particularly a kind of high precision Velocity Measurement on Highway instrument calibrating installation.
Background technology
In traffic monitoring, the travel speed of motor vehicle is very important safety factor, therefore, and the instrument that ubiquity is measured motor vehicle instantaneous velocity on highway at present.Test the speed and refer to that the average velocity to motor vehicle travels in interval test segment is measured in interval, measuring relative to instantaneous velocity, tests the speed and can evaluate the overall travel situations of motor vehicle at test segment in interval.To combine with instantaneous velocity measurement by being tested the speed in interval, more scientifically can evaluate motor vehicle and whether there is the acts of violating regulations such as hypervelocity in the process of moving, for traffic safety monitoring and punishment on contravention of regulation provide stronger technical support and enforce foundation.Therefore, the interval Velocity Measurement on Highway instrument combined with instantaneous velocity measurement that tests the speed is promoted in the whole nation just gradually at present.Measurement accuracy due to Velocity Measurement on Highway instrument directly has influence on fairness and the accuracy of traffic monitoring law enforcement.For this reason, propose a kind of can the method for the every measurement index of full system calibration Velocity Measurement on Highway instrument, to guarantee authority and the public credibility of traffic administrative law enforcement, ensure the security of the lives and property when people drive a vehicle, there is very profound significance.
The principle of work tested the speed in interval is that test the speed in the interval outlet in section and porch sets up two high-speed cameras respectively, to to sail into and outgoing vehicles is captured, and the time that record is captured, because the length of test segment is known, so just can be obtained the average velocity of motor vehicle form by the running time of computing machine motor-car.When calibrating interval speed measuring system, normally between speed trial ground and the section travel time measure, and then obtain the average speed value of motor-driven vehicle going, and the average speed value measured by itself and interval speed measuring system compared, thus it is calibrated.But in order to can comprehensive monitoring traveling state of vehicle, for verification provides abundant foundation in the future, the instantaneous velocity of motor-driven vehicle going be also measured by current Velocity Measurement on Highway instrument while monitoring the average velocity of motor-driven vehicle going, and records the candid photograph time.Therefore, just carry out independent calibration for the average velocity of Velocity Measurement on Highway instrument or instantaneous velocity measurement result and can not meet current demand.
Because the national interval vertification regulation that tests the speed also is not put into effect, unripe interval speed measuring system calibration steps and calibrating installation are suggested, metering institute of Guangdong Province proposes a kind of interval based on timer in October, 2014 and to test the speed calibrating installation, but there is following shortcoming:
1, this device can only calibrate the average velocity measured value of Velocity Measurement on Highway instrument, can not calibrate for the instantaneous velocity measurement result in Velocity Measurement on Highway instrument.
The timer of to be display precision the be 0.1s 2, adopted due to this device, and the candid photograph time of Velocity Measurement on Highway instrument record is display precision is the real-time time of 0.01s, therefore this device can not calibrate the candid photograph time of Velocity Measurement on Highway instrument.
For above shortcoming, the present invention proposes a kind of high precision Velocity Measurement on Highway instrument calibrating installation, and this device can not only realize the high-precision calibration measured Velocity Measurement on Highway instrument average velocity, can also calibrate instantaneous velocity and the real-time time of Velocity Measurement on Highway instrument simultaneously.
Summary of the invention
The object of the invention is to propose a kind of device that can carry out general calibration to Velocity Measurement on Highway instrument, temperature compensating crystal oscillator and GPS module is utilized to realize the real-time clock that display precision is 1/100s, real-time time and instantaneous velocity are simultaneously displayed in LED display, store the operating range of each time point place motor vehicle on a processor simultaneously, compared by the real-time time of standard real-time time that video capture LED is shown and standard instantaneous velocity and interval speed measuring system record and instantaneous velocity, realize the real-time time value of Velocity Measurement on Highway instrument and the calibration of instantaneous velocity measured value, simultaneously by searching and the operating range of computing machine motor-car within the time of twice candid photograph, the standard average velocity of motor-driven vehicle going can be obtained, by comparing with the average velocity of Velocity Measurement on Highway instrument record, realize the calibration to average velocity.
The present invention is achieved in that this device comprises real-time clock module, data processor module, non-contact displacement sensor and LED display, real-time clock model calling data processor module, data processor module connects non-contact displacement sensor and LED display.
Described real-time clock module comprises satellite time transfer module, temperature compensating crystal oscillator and clock chip.
Described LED display comprises real-time time display module and instantaneous velocity display module.
The output terminal of described satellite time transfer module passes through the input end of data line connection data processor module, the output terminal of temperature compensating crystal oscillator connects the input end of clock chip by data line, the input/output terminal of clock chip passes through the input/output terminal of data line connection data processor module, the input/output terminal of processor module connects the input/output terminal of non-contact displacement sensor by data line, the input/output terminal of processor module connects real-time time display module and instantaneous velocity display module by data line.
Beneficial effect of the present invention:
1. by adopting high precision temperature compensating crystal oscillator to provide stable concussion electric signal for high-precision real-time timepiece chip, and utilize the timing of satellite time transfer module to revise the mode of real-time time, realize the real-time clock of high display precision and high accuracy, and real-time time is shown to the real-time time display module of LED display, by the video camera of Velocity Measurement on Highway instrument to the candid photograph of LED display, while the calibration of the average velocity measurement result for Velocity Measurement on Highway instrument provides the high-precision motor vehicle running time, realize the calibration to interval speed measuring system real-time time.2. by adopting the non-contact displacement sensor of high resolution to measure the operating range of motor vehicle and instantaneous velocity and measure, and instantaneous velocity is presented at LED instantaneous velocity display module, by the video camera of interval speed measuring system to the candid photograph of LED display, while the calibration of the average velocity measurement result for Velocity Measurement on Highway instrument provides high-precision motor-driven vehicle going displacement, realize the calibration to Velocity Measurement on Highway instrument motor-driven vehicle going instantaneous velocity.3. the measuring accuracy by adopting real-time clock module and high precision non-contact displacement sensor to improve average velocity, and then improve the calibration accuracy of draw velocity measurement.
Accompanying drawing illustrates:
Fig. 1 is the structural drawing of a kind of high precision Velocity Measurement on Highway instrument calibrating installation provided by the invention.
Fig. 2 is the course of work of a kind of high precision Velocity Measurement on Highway instrument calibrating installation provided by the invention.
In figure: 1 real-time clock module, 11 satellite time transfer modules, 12 temperature compensating crystal oscillators, 13 clock chips, 2 data processor module, 21 satellite modules serial port data lines, 22 clock chip serial port data lines, 23 non-contact displacement sensor data lines, 24LED screen parallel port data line, 3 non-contact displacement sensors, 4LED display screen, 41 real-time time display modules, 42 instantaneous velocity display modules.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described with enforcement.
As shown in Figure 1, this device comprises real-time clock module 1, data processor 2, non-contact displacement sensor 3 and LED display 4.Described real-time clock module 1 is made up of satellite time transfer module 11, temperature compensating crystal oscillator 12 and clock chip 13, the wherein satellite time transfer module 11 UM220 satellite modules of producing for Xin Xingtong company, the high precision clock chip of clock chip 13 to be models be PCF8583.What described data processor 2 adopted is C8051F040 single-chip microcomputer.Described non-contact displacement sensor 3 is models that Kistler company produces is the non-contact displacement sensor of CorrevitL-350Aqua.Described LED display 4 shows module 41 by real-time time and instantaneous velocity display module 42 forms.
The motor-driven vehicle going distance that the standard real-time time that real-time clock module 1 produces and non-contact displacement sensor 3 record and Instantaneous velocity values are transferred to data processor 2, real-time time, operating range and instantaneous velocity are set up list and are stored by data processor 2, real-time time and Instantaneous velocity values are transferred to LED display 4, are presented at real-time time display module 41 and instantaneous velocity display module 42 respectively.LED display 4 is placed on motor vehicle roof, from the horizontal by 45° angle.
Satellite time transfer module 11 in real-time clock module 1 is by obtaining the real-time time of standard with satellite communication, and by satellite modules serial port data line 21, the real-time time of standard is transferred to data processor 2, the real-time time of standard is transferred to clock chip 13 by clock chip serial port data line 22 by data processor 2, as the time initial value of clock chip 13.Clock chip 13 utilizes the oscillator signal that temperature compensating crystal oscillator 12 is transmitted by oscillator signal line 14 automatically to upgrade real-time time.Satellite time transfer module 11 is according to the program setting time interval, and the real-time time of standard is transferred to data processor 2 by satellite by timing, is revised by the real-time time of data processor 2 pairs of real-time timepiece chips 13.Non-contact displacement sensor 3 can the simultaneously operating range of measuring machine motor-car and instantaneous velocity.The every 0.01s of data processor 2 obtains real-time time by clock chip serial port data line 22 from clock chip 13, from non-contact displacement sensor 3, the Distance geometry instantaneous velocity of motor-driven vehicle going is obtained by non-contact displacement sensor data line 23, set up the corresponding form of real-time time and motor-driven vehicle going distance, real-time time and instantaneous velocity are transferred to LED display 4 by LED screen parallel port data line 24 simultaneously, the real-time time display module 41 of LED display 4 shows real-time time, instantaneous velocity display module 42 shows the instantaneous velocity of motor-driven vehicle going.
Satellite time transfer module 11 of the present invention can with GPS of America satellite and Chinese Beidou satellite communication time service, the minimum time service cycle is 1s; The intrinsic crystal oscillator frequency of described temperature compensating crystal oscillator 12 is 32.768kHz, and frequency stability relative error is; Described clock chip 13 for minimum memory time value be the high precision clock chip of 0.01s; Described non-contact displacement sensor 3 can the simultaneously operating range of measuring machine motor-car and instantaneous velocity, and displacement resolving power is 1mm, and instantaneous velocity accuracy of measurement is 0.5%; The real-time time display module 41 of described LED display 4 shows the real-time time value of 8, minimum figure place showing is 0.01s, every real-time time value height 10cm, wide 5cm, be the LED module displays that 5mm White LED bulb rearranges according to 7 segment numeral tube shapes by diameter, instantaneous velocity display module 42 shows the motor-driven vehicle going instantaneous velocity of 4, minimum figure place showing is 0.1km/h, every real-time time value height 8cm, wide 4cm are the LED module displays that 5mm White LED bulb rearranges according to 7 segment numeral tube shapes by diameter.
Fig. 2 is the course of work of high precision Velocity Measurement on Highway instrument calibrating installation provided by the invention, when test machine motor-car carry high precision Velocity Measurement on Highway instrument calibrating installation drive to the porch of test segment time, the video camera of porch can be taken pictures to test vehicle front, have recorded photo opporunity, motor-driven vehicle going instantaneous velocity in photo, and the standard real-time time of display in LED display 4 and motor-driven vehicle going instantaneous velocity are taken simultaneously.When test machine motor-car drives to the exit of test segment, the video camera in exit can be taken pictures to test machine motor-car equally.Compared by standard real-time time that display screen in system log (SYSLOG) real-time time in photo and instantaneous velocity and photo is shown and instantaneous velocity, can directly calibrate the real-time time of Velocity Measurement on Highway instrument and instantaneous velocity measurement result.Simultaneously by operating range with utilize the standard average velocity sailing and roll away from the motor-driven vehicle going that motor-driven vehicle going Time Calculation that the Time Calculation that tests the speed section obtains obtains into, can the average velocity that Velocity Measurement on Highway instrument records be calibrated.
In the high precision Velocity Measurement on Highway instrument calibrating installation that the present invention proposes, the calculation expression of standard average velocity is:
Wherein, t
1it is the real-time time that motor vehicle shows in the LED display 4 that test segment porch video camera takes; t
2it is the real-time time that the LED display 4 of motor vehicle under the video camera of test segment exit shows; L
1that motor vehicle is at t
1the operating range of moment record; L
2that motor vehicle is at t
2the operating range of moment record.Known according to formula (1), the accuracy of average velocity is relevant with the displacement measurement accuracy of the real-time time accuracy of real-time clock module 1 and non-contact displacement sensor 3.
Real-time clock produces in certain time interval T maximum time, the calculation expression of error was:
ε＝ηT(2)
Wherein, η is the stability relative error of the inner crystal oscillator of real-time clock.Known according to formula (2), maximum time error relevant with the stability η of the inner crystal oscillator of real-time clock and the cumulative time length T of generation time error.The stability of the inner crystal oscillator of real-time clock is higher, and namely ε is less, and the cumulative time of error is shorter, then the maximum time error amount of real-time clock is less.Therefore, for realizing real-time clock, needing the stability improving the inner crystal oscillator of real-time clock, and shortening the cumulative time length producing error.For this reason, the cumulative time first adopting the mode of satellite time transfer module timing time service to shorten error in the present invention to produce, the time service cycle, most I reached 1s; Secondly adopt the temperature compensating crystal oscillator with temperature compensation function as the inside crystal oscillator of real-time clock, frequency stability relative error is 1 × 10
-9.The maximum error calculating the time variations of the real-time clock module in the present invention according to formula (2) is 1 × 10
-9s, meets day cumulative errors completely and is less than the requirement of 1s.
Further, the clock chip 13 adopted due to the present invention for minimum memory time value be the high precision clock chip of 0.01s, the display precision of real-time time reaches 0.01s.
When measuring motor-driven vehicle going distance, due to section distance longer (being about 10km) of testing the speed, road conditions are complicated and travel route is not straight line, for this reason, adopt distance measurement method to need can identification maneuver car driving trace, and operating range to be measured.Can address this problem based on satnav with based on these two kinds of distance measurement methods of non-contact displacement sensor.Principle based on the motor-driven vehicle going distance measurement method of satnav is contained on motor vehicle by satellite positioning module, utilizes satellite to position and simultaneous computer motor-car operating range motor vehicle in real time.Principle based on the motor-driven vehicle going distance measurement method of non-contact displacement sensor is loaded on motor vehicle by non-contact displacement sensor, the reflected light of photochromics to ground utilizing sensor internal to arrange according to optical grating construction gathers and analytical calculation, realizes the measurement to motor-driven vehicle going distance.But the motor-driven vehicle going distance measurement method be compared to based on non-contact displacement sensor, due in tunnel cannot with satellite communication, the motor-driven vehicle going distance measurement method based on satnav cannot work in tunnel.And the error of satnav is 5m, and the range resolution of non-contact displacement sensor can reach a millimeter magnitude, therefore, the present invention adopts non-contact displacement sensor to measure motor-driven vehicle going distance.The least displacement resolving power of the non-contact displacement sensor that the present invention adopts is 1mm, and can measure the instantaneous velocity of motor-driven vehicle going simultaneously, and instantaneous velocity accuracy of measurement is 0.5%, meets the accuracy requirement of 1%.
Claims (4)
1. a high precision Velocity Measurement on Highway instrument calibrating installation, it is characterized in that: this device comprises real-time clock module, data processor module, non-contact displacement sensor and LED display, real-time clock model calling data processor module, data processor module connects non-contact displacement sensor and LED display.
2. high precision Velocity Measurement on Highway instrument calibrating installation according to claim 1, is characterized in that: described real-time clock module comprises satellite time transfer module, temperature compensating crystal oscillator and clock chip.
3. high precision Velocity Measurement on Highway instrument calibrating installation according to claim 1, is characterized in that: described LED display comprises real-time time display module and instantaneous velocity display module.
4. according to claim 1, high precision Velocity Measurement on Highway instrument calibrating installation described in 2 or 3, it is characterized in that: the output terminal of described satellite time transfer module passes through the input end of data line connection data processor module, the output terminal of temperature compensating crystal oscillator connects the input end of clock chip by data line, the input/output terminal of clock chip passes through the input/output terminal of data line connection data processor module, the input/output terminal of processor module connects the input/output terminal of non-contact displacement sensor by data line, the input/output terminal of processor module connects real-time time display module and instantaneous velocity display module by data line.
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| CN114125177A (en) * | 2020-08-28 | 2022-03-01 | 魔门塔(苏州)科技有限公司 | Image time stamp calibration system and method based on image frame number |
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Application publication date: 20151209 |