CN103969465B - A kind of method of car-mounted terminal big-dipper satellite location automatic Calibration impulse ratio - Google Patents
A kind of method of car-mounted terminal big-dipper satellite location automatic Calibration impulse ratio Download PDFInfo
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- CN103969465B CN103969465B CN201410222381.8A CN201410222381A CN103969465B CN 103969465 B CN103969465 B CN 103969465B CN 201410222381 A CN201410222381 A CN 201410222381A CN 103969465 B CN103969465 B CN 103969465B
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Abstract
The method of a kind of car-mounted terminal big-dipper satellite location automatic Calibration impulse ratio, it relates to a kind of car-mounted terminal location automatic Calibration technical field.The present invention obtains current speed to lead to big-dipper satellite alignment system, automatically calculates impulse ratio, obtains sensor speed.Big-dipper satellite alignment system is utilized to obtain current speed；Gather pulse signal number and the pulse signal frequency of vehicle speed sensor, pulse number in the unit of account time obtains pulse signal frequency and by intervalometer, periodic quantity is calculated pulse signal frequency, the method using two kinds of pulse signal frequencies mutually corrects, and filtering clutter obtains stable pulse signal frequency value F；The vehicle ground speed calculation impulse ratio that the pulse signal frequency value obtained by vehicle speed pulse processing system and big-dipper satellite alignment system are obtained.
Description
Technical field
The present invention relates to a kind of car-mounted terminal location automatic Calibration technical field.
Background technology
At present, China develops the important content as popularization and application using dipper system user terminal, is all being actively developed base
Ustomer premises access equipment light, practical in dipper system.The various application of ustomer premises access equipment based on dipper system are more and more wider
General.At present, most car-mounted terminals fills, by the equipment of user installation after i.e. automobile dispatches from the factory after installing and belonging to.User installation car
Need during mounted terminal to arrange impulse ratio, it is thus achieved that this value has two approach: 1) obtain kl value (rear-end ratio), k2
Value (gear ratio of change speed gear box Worm-gear assembly), R value (rolling radius of tire) calculate voluntarily；2) speed of vehicular meter
Ratio.Above two approach all cannot directly obtain impulse ratio, requires a great deal of time and manpower contacts vehicle production
Producer or instrument manufacturer obtain this value.
In standard GB/T/T 19056-2012 automobile travel recorder specify, automobile travel recorder to Vehicle Speed,
Other status informations that time, mileage, position and relevant vehicle travel carry out recording, storing and can pass through data communication in fact
The digital electronic recording equipment of existing data output, the Vehicle Speed of automobile travel recorder must pass through vehicle speed sensor
Obtain.
Impulse ratio: the pulse signal number that vehicle speed sensor produces during vehicle travels 1km distance.Impulse ratio etc.
It is same as the speed ratio of conventional combination instrument.
Summary of the invention
The method that it is an object of the invention to provide a kind of car-mounted terminal big-dipper satellite location automatic Calibration impulse ratio, with the logical Big Dipper
Global position system obtains current speed, automatically calculates impulse ratio, obtains sensor speed.
The present invention solves that above-mentioned technical problem adopts the technical scheme that:
A kind of method of car-mounted terminal big-dipper satellite location automatic Calibration impulse ratio, the process that realizes of described method is:
Step one, utilizing big-dipper satellite alignment system to obtain current speed, unit is Km/h:
V-speed=GpsSpeed × 1.852, GpsSpeed be the unit that big-dipper satellite alignment system obtains be in the sea/time ground
Face velocity (current speed)；V-speed be big-dipper satellite alignment system obtain the ground speed that unit is km/h (when
Front speed)；
Step 2, the pulse signal number gathering vehicle speed sensor and pulse signal frequency, the pulse in the unit of account time
Number obtains pulse signal frequency and by intervalometer, periodic quantity is calculated pulse signal frequency, uses two kinds of pulse signal frequencies
The method of rate mutually corrects, and filtering clutter obtains pulse signal frequency value F；
Step 3, acquisition impulse ratio P:
The unit that pulse signal frequency value F obtained by vehicle speed pulse processing system and big-dipper satellite alignment system are obtained
Following formula is utilized to calculate impulse ratio for ground speed (current speed) V-speed of km/h:
P=F × 3600/V-speed, wherein, P: impulse ratio；
Step 4, by following formula calculate sensor speed, complete speed demarcate:
V=F × 3600/P, wherein, P: impulse ratio.
In step 3, the detailed process calculating impulse ratio is:
Step 1, impulse ratio are not demarcated；
After step 2, execution step 1, gather valid data；
Step 3, judging whether to remember that big-dipper satellite positions, whether GPS velocity was more than 40, if more than 1 second；If
It is to perform step 4, otherwise return step 1；
Step 4, calculate impulse ratio according to formula P=F × 3600/V-speed, be stored in and compare caching；
Step 5, continuous 7 the fast ratio errors that judge whether < 3, if it is, perform step 6, otherwise counter O reset；
Step 6, take that to compare the meansigma methods of caching be Pulse Calibration coefficient, be stored in FRAM and calculate sensor vehicle velocity V；
Step 7, judge that sensor speed is the most equal with GPS speed, if it is, perform step 8；Otherwise enumerator is clear
Zero；
Step 8, continue to determine whether that continuous 30 seconds speeds are the most equal, if it is, perform step 9, otherwise counter O reset；
Step 9, index pulse coefficient are demarcated, are stored in FRAM.
The invention has the beneficial effects as follows:
Obtain speed by big-dipper satellite alignment system, obtained the pulse signal of vehicle speed sensor by single-chip microcomputer capture middle-end
Number and pulse signal frequency, then calculated by computing formula, use some filter algorithms, automatically to calculate impulse ratio.
Ideally, in the case of i.e. on speedometer, the reading of display is equal with actual measurement speed, the speed ratio calculated is referred to as
Theoretical velocity ratio, its computing formula is K=l:[(kl/k2) xl000/ (2 π R)], K is theoretical velocity ratio, and kl is that back axle master subtracts
Speed ratio, k2 is the gear ratio of change speed gear box Worm-gear assembly, and R is the rolling radius of tire.
The invention described above uses the method for automatic Calibration can obtain impulse ratio (speed ratio) without manually carrying out intervening and calculating.
If manually calculate speed than acquisition kl value (rear-end ratio) needing professional person and using number of ways and obtain vehicle,
K2 value (gear ratio of change speed gear box Worm-gear assembly), R value (rolling radius of tire) could obtain through complicated calculating.
Accompanying drawing explanation
Fig. 1 is that the automatic Calibration impulse ratio of the present invention realizes process flow diagram flow chart.
Detailed description of the invention
Detailed description of the invention one: see shown in 1, the car-mounted terminal big-dipper satellite location automatic Calibration described in present embodiment
The method of impulse ratio, is described in detail below:
One, vehicle speed pulse processing system
Gathering pulse signal number and the pulse signal frequency of vehicle speed sensor, computational methods are as follows:
Utilize the capture middle-end of 16 bit clock unit T/C1, be set to input capture rim detection middle-end, work as GES
The logic level (event) gathered on pin there occurs change, and this level is changed to marginal detector and is confirmed, input
Seizure is excited, and pulse signal counter adds up.Pulse signal frequency is obtained by the pulse number in the unit of account time
Rate, calculates pulse signal frequency by the periodic quantity of intervalometer pair, uses the method for two kinds of pulse signal frequencies mutually to correct,
Filtering clutter, it is thus achieved that stable pulse signal frequency value (F).
The computational methods of sensor speed:
V=F × 3600/P, wherein, P: impulse ratio；F: sensor vehicle speed pulse frequency；V-speed: speed
Degree.
Two, big-dipper satellite alignment system
NMEA is " National Marine Electronics Association " (international ocean Institution of Electronics) abbreviation, simultaneously
Ye Shi data transmission standard TIA, here, actually should be NMEA 0183.
$BDRMC,hhmmss.ss,A,llll.llllll,a,yyyyy.yyyyyy,a,x.x,x.x,ddmmyy,x.x,a,a*hh<
CR><LF>
The source program realized is:
In NMEA, ground speed unit is joint, joint be in the sea/time the meaning, marine measuring length is with in the sea, so speed
Application " saving ", the code name of " saving " is the prefix of English " Knot ", uses " Kn " to represent.1 joint is equal to 1 nautical mile per hour, also
It is exactly to travel 1.852 kms (kilometer) per hour.Current speed Km/h can be obtained by conversion.
V-speed=GpsSpeed × 1.852, GpsSpeed is satellite positioning module ground speed, and V-speed is vehicle
Ground speed, unit km/h.
Three, impulse ratio computational methods
The pulse signal frequency value (F) obtained by vehicle speed pulse processing system and big-dipper satellite alignment system are obtained
The method that the ground speed (V-speed) of vehicle calculates impulse ratio is as follows:
P=F × 3600/V-speed, wherein, P: impulse ratio；F: frequency；V-speed: speed.
Detailed algorithm is as shown in Figure 1.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not
Be confined to this, any those familiar with the art in the technical scope that the invention discloses, root
According to technical scheme and inventive concept equivalent or change in addition thereof, all should contain in the present invention
Protection domain within.
Claims (2)
1. the method for a car-mounted terminal big-dipper satellite location automatic Calibration impulse ratio, it is characterised in that:
The process that realizes of described method is:
Step one, utilizing big-dipper satellite alignment system to obtain current speed, unit is Km/h:
V-speed=GpsSpeed × 1.852, GpsSpeed be the unit that big-dipper satellite alignment system obtains be in the sea/time ground
Face velocity；V-speed is the ground speed that unit is km/h that big-dipper satellite alignment system obtains；
Step 2, the pulse signal number gathering vehicle speed sensor and pulse signal frequency, the pulse in the unit of account time
Number obtains pulse signal frequency and by intervalometer, periodic quantity is calculated pulse signal frequency, uses two kinds of pulse signal frequencies
Method mutually correct, filtering clutter obtain pulse signal frequency value F；
Step 3, acquisition impulse ratio P:
The unit that pulse signal frequency value F obtained by vehicle speed pulse processing system and big-dipper satellite alignment system are obtained
Following formula is utilized to calculate impulse ratio for the ground speed V-speed of km/h:
P=F × 3600/V-speed, wherein, P: impulse ratio；
Step 4, by following formula calculate sensor speed, complete speed demarcate:
V=F × 3600/P, wherein, P: impulse ratio.
The method of car-mounted terminal big-dipper satellite the most according to claim 1 location automatic Calibration impulse ratio, its feature exists
In:
In step 3, the detailed process calculating impulse ratio is:
Step 1, impulse ratio are not demarcated；
After step 2, execution step 1, gather valid data；
Step 3, judging whether to remember that big-dipper satellite positions, whether V-speed was more than 40, if more than 1 second；If it is,
Perform step 4, otherwise return step 1；
Step 4, calculate impulse ratio according to formula P=F × 3600/V-speed, be stored in and compare caching；
Step 5, continuous 7 the fast ratio errors that judge whether < 3, if it is, perform step 6, otherwise counter O reset；
Step 6, take that to compare the meansigma methods of caching be Pulse Calibration coefficient, be stored in FRAM and calculate sensor vehicle velocity V；
Step 7, judge that sensor speed is the most equal with V-speed, if it is, perform step 8；Otherwise counter O reset；
Step 8, continue to determine whether that continuous 30 seconds speeds are the most equal, if it is, perform step 9, otherwise counter O reset；
Step 9, index pulse coefficient are demarcated, are stored in FRAM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410222381.8A CN103969465B (en) | 2014-05-23 | A kind of method of car-mounted terminal big-dipper satellite location automatic Calibration impulse ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410222381.8A CN103969465B (en) | 2014-05-23 | A kind of method of car-mounted terminal big-dipper satellite location automatic Calibration impulse ratio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103969465A CN103969465A (en) | 2014-08-06 |
| CN103969465B true CN103969465B (en) | 2016-11-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1032079A (en) * | 1987-08-27 | 1989-03-29 | 江苏省计量测试技术研究所 | Multifunction digital control checker for measuring standerd rotating speed |
| US6708115B1 (en) * | 1999-03-08 | 2004-03-16 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Vehicle speedometer |
| CN103604951A (en) * | 2013-10-30 | 2014-02-26 | 湖北汽车工业学院 | Vehicle-speed-signal measurement method of vehicle-speed sensor and measurement and control system thereof |
| CN103698552A (en) * | 2013-12-04 | 2014-04-02 | 厦门雅迅网络股份有限公司 | Method for improving accuracy of calculating vehicle running speed by mileage pulse |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1032079A (en) * | 1987-08-27 | 1989-03-29 | 江苏省计量测试技术研究所 | Multifunction digital control checker for measuring standerd rotating speed |
| US6708115B1 (en) * | 1999-03-08 | 2004-03-16 | Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho | Vehicle speedometer |
| CN103604951A (en) * | 2013-10-30 | 2014-02-26 | 湖北汽车工业学院 | Vehicle-speed-signal measurement method of vehicle-speed sensor and measurement and control system thereof |
| CN103698552A (en) * | 2013-12-04 | 2014-04-02 | 厦门雅迅网络股份有限公司 | Method for improving accuracy of calculating vehicle running speed by mileage pulse |
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Inventor after: Deng Ge Inventor after: Wang Yunpeng Inventor after: An Jingjing Inventor after: Zhang Lianying Inventor after: Li Dexian Inventor after: Jiang Jun Inventor before: Liu Zhongquan Inventor before: Wang Zhiyong Inventor before: Zhang Lianying Inventor before: Zhang Yuanjun |
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