CN1467923A - Vehicle mounted communication apparatus and traffic information processing method using the same - Google Patents
Vehicle mounted communication apparatus and traffic information processing method using the same Download PDFInfo
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- CN1467923A CN1467923A CNA021124795A CN02112479A CN1467923A CN 1467923 A CN1467923 A CN 1467923A CN A021124795 A CNA021124795 A CN A021124795A CN 02112479 A CN02112479 A CN 02112479A CN 1467923 A CN1467923 A CN 1467923A
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Abstract
The invention discloses a vehicle mounted communication equipment and the traffic information processing method therefore. The vehicle mounted communication equipment comprises signal receiving arrangement, signal transmitting arrangement, central processing unit, speed data interface, direction sensor, data memory unit and the data bus. The invention also discloses the traffic information processing method for using the vehicle mounted communication equipment. The invention can overcome the drawbacks such as the rising of communication cost, wireless resources consumption or bad parking stall information present in the prior art technologies.
Description
Technical field
The present invention relates to a kind of vehicular communication equipment and use the information processing method of this vehicular communication equipment, particularly relate to by the variation of analyzing vehicle running state and determine its positional information transmission time interval, thereby realize dynamically adjusting the method and the vehicular communication equipment thereof of vehicle position information transmission time interval.
Background technology
Existing vehicular communication equipment and transport information control technology thereof are, vehicular communication equipment is by the GPS (Global Position System) receiving system, sender unit, CPU, data storage cell and data transfer bus are formed, vehicle constantly sends the geographical location information of oneself in the process of moving to vehicle scheduling monitoring system centre, thereby realizes scheduling, monitoring and tracking; But for energy Real-Time Scheduling, monitoring and tracking, vehicle just must be continuously to dispatching and monitoring center report latest position information, if vehicle adopts constant duration to send positional information to the control centre, will run into following problem: the one, too little if the time interval is obtained, parking space information transmission frequency height, though the control centre can obtain vehicle location accurately, but a large amount of like this vehicles frequently sends information will make communications cost rise, and wireless network resource consumed in a large number, may also can cause communication blocking; The 2nd, if the time interval is obtained greatly, then the transmission frequency of parking space information is low, but the control centre just can't obtain the position of vehicle timely and accurately, causes the deviation in the dispatching and monitoring.
Summary of the invention
The technical issues that need to address of the present invention are the information processing methods that adopt a kind of vehicular communication equipment and use this vehicular communication equipment, to overcome the defective of the communications cost rising, radio resource consumption or the parking space information poor accuracy that exist in the prior art.
Technical scheme of the present invention:
A kind of vehicular communication equipment includes signal receiving device, sender unit, CPU, speed data interface, data storage cell and data/address bus; Above-mentioned CPU is connected with signal receiving device, sender unit, data storage cell and speed data interface respectively by data/address bus, and above-mentioned CPU can be finished following operation:
Produce the clock sampling signal of certain frequency;
Timer is set and with its initialization;
Be converted to vehicle position information after the vehicle latitude and longitude information that will from signal receiving device, obtain;
Sample when the data that the speed data interface is sent wait, and with the storage that collects in data storage cell;
Judge after memory data output reaches the sampling number N of setting, from data storage cell, obtain the time interval that data computation sends vehicle position information;
Calculate the time interval that sends vehicle position information, judge if this time interval littler and also the current time value than the timer record is little than the preceding time interval of once calculating, then send instruction to sender unit, by sender unit vehicle position information is sent, give writing time of timer simultaneously and be worth zero clearing.
This vehicular communication equipment also includes direction sensor, this direction sensor is connected with above-mentioned CPU by data/address bus, when this CPU can wait the data that the direction transducer sends sampling and with the storage that collects in data storage cell, and the time interval that can from data storage cell, obtain data computation transmission vehicle position information; Described signal receiving device is made up of signal receiving antenna and signal receiving module; Described sender unit is made up of signal transmitting antenna and signal transmitting module.
A kind of transport information control method of using above-mentioned vehicular communication equipment, it includes following steps,
Vehicular communication equipment receives latitude and longitude information, and obtains vehicle position information after handling; When the data that direction sensor, speed data interface send to CPU, CPU etc. after the sampling, with the storage that collects in data storage cell; When the data total amount that deposits data storage cell in reaches default sampling number N, CPU calculates speed and angular speed sample average after obtaining data, calculate speed and angular speed sample average variable quantity again, draw the time interval that sends vehicle position information then, if judge should the time interval littler and also the current time value than the timer record is little than the preceding time interval of once calculating, so just be sent to wireless network, data are sent to the dispatching and monitoring center, the information that the vehicle transmission is gathered at the dispatching and monitoring center draws road traffic condition after treatment again.
The formula of computational speed and angular speed sample average is
Wherein, V
nN the speed average that expression need be tried to achieve, Φ
nN the angular speed average that expression need be tried to achieve; N is the positive integer greater than 1, each V or the Φ sample value number that participates in calculating of expression; P is a percentage, represents the most contiguous V or Φ sample value shared proportion in N sample value altogether.
Δ V
n＝ V
n- V
n-1
Δ Φ
n＝ Φ
n- Φ
n-1
Δ V and ΔΦ are corresponding angular speed, speed Change in Mean amount.
The formula that calculates the time interval that sends vehicle position information is
ΔT
n＝K·F(Δ V
n，Δ Φ
n)＝K/(a·|Δ V
n|+b·|Δ Φ
n|+c)
K is one greater than zero constant; A and b are the amplification coefficient of Δ V, ΔΦ, are used for regulating Δ V, the ΔΦ influence to Δ T; It is zero that c is used for avoiding denominator, and a, b and c are the positive number greater than zero.
By above-mentioned objective technical scheme as seen, the present invention so reduced communications cost when guaranteeing the vehicle position information accuracy, has saved Radio Resource owing to can determine its positional information transmission time interval by the variation of analyzing vehicle running state.
Description of drawings
Fig. 1 is the structural representation block diagram of vehicular communication equipment of the present invention;
Fig. 2 uses the flow chart of steps of the traffic control method of this vehicular communication equipment for the present invention;
Fig. 3 is vehicular communication equipment of the present invention and the fundamental diagram that uses the traffic control method of this vehicular communication equipment.
Embodiment
Referring to Fig. 1, vehicular communication equipment of the present invention includes signal receiving device, sender unit, CPU, speed data interface, data storage cell and data/address bus; Above-mentioned CPU is connected with signal receiving device, sender unit, data storage cell and speed data interface respectively by data/address bus, and described signal receiving device is made up of signal receiving antenna and signal receiving module; Described sender unit is made up of signal transmitting antenna and signal transmitting module.
Above-mentioned CPU can be finished following operation:
Produce the clock sampling signal of certain frequency;
Timer is set and with its initialization;
Be converted to vehicle position information after the vehicle latitude and longitude information that will from signal receiving device, obtain;
Sample when the data that the speed data interface is sent wait, and with the storage that collects in data storage cell;
Judge after memory data output reaches the sampling number N of setting, from data storage cell, obtain the time interval that data computation sends vehicle position information;
Calculate the time interval that sends vehicle position information, judge if this time interval littler and also the current time value than the timer record is little than the preceding time interval of once calculating, then send instruction to sender unit, by sender unit vehicle position information is sent, give writing time of timer simultaneously and be worth zero clearing.
In order to improve the computational accuracy in the time interval that sends vehicle position information, this vehicular communication equipment can also include direction sensor, this direction sensor is connected with above-mentioned CPU by data/address bus, when this CPU can wait the data that the direction transducer sends sampling and with the storage that collects in data storage cell, and the time interval that can from data storage cell, obtain data computation transmission vehicle position information.
The model of this CPU is AT91M40800; The model of direction sensor is ENV-05F-03; It is totally 4 of the read-only memorys at random (RAM) of 256KB that memory cell adopts memory size; Signal receiving device adopts gps antenna and GPS module, and model is GSU-16; Sender unit adopts GPRS (GPRS) module, and model is SIEMENS MC35, and adopts the GPRS antenna transmission, and the times N of sampling can be set to 100, and sample frequency is 1 hertz.
As shown in Figures 2 and 3, a kind of transport information control method of using above-mentioned vehicular communication equipment, it includes following steps,
Vehicular communication equipment receives latitude and longitude information, and obtains vehicle position information after handling; When the data that direction sensor, speed data interface send to CPU, CPU etc. after the sampling, with the storage that collects in data storage cell; When the data total amount that deposits data storage cell in reaches default sampling number N, CPU calculates speed and angular speed sample average after obtaining data, calculate speed and angular speed sample average variable quantity again, draw the time interval Δ T that sends vehicle position information then
nIf, judge should the time interval than the preceding time interval Δ T that once calculates
N-1Little and also the current time value T than timer record is little, so just be sent to wireless network, this wireless network can be GPRS net (GPRS), again via internet, at last data are sent to the dispatching and monitoring center, the information that the vehicle transmission is gathered at the dispatching and monitoring center draws road traffic condition after treatment.
The method of calculating the time interval that sends vehicle position information is the variate-value that collects according to two: linear velocity V and angular speed Φ, and some adjustment parameters draw a rational time interval Δ T; Wherein car speed V is provided to the speed data interface by the vehicle speed sensor of vehicle, angular speed Φ is provided by the direction sensor of vehicular communication equipment, meanwhile CPU is gathered the data flow of direction transducer and speed data interface, store into by data/address bus in two FIFO (first in first out) formation of data storage cell RAM, queue length is N, when queue full, calculate Δ V and ΔΦ:
Formula 1
Formula 2
Wherein, the linear velocity V and the angular speed Φ that participate in calculating are the discrete signals of sampling gained, V
nN the linear velocity average that (n＞=0) expression need be tried to achieve, Φ
nN the angular speed average that (n＞=0) expression need be tried to achieve; P is a percentage, represents the most contiguous V or Φ sample value shared proportion in N sample value altogether.Usually P is bigger, and general value 50% shows that promptly the most contiguous sample value is big to the influence of final result, and all the other sample values can be regarded as the same to result's influence.By suitable N and P value, we can obtain one group can embody V and the Φ that the overall speed of a motor vehicle changes, and ignores the variation between each adjacent sample value.Draw speed and angular speed sample mean changing value then:
Δ V
n=V
n-V
N-1Formula 3
ΔΦ
n=Φ
n-Φ
N-1Formula 4
Calculate the time interval Δ T that sends vehicle position information subsequently
n:
According to actual conditions, we wish when the transport condition no change of vehicle, for example at the uniform velocity travel or static the time, be that Δ V, ΔΦ are little, prolong the transmission time interval of vehicle position information because this moment vehicle the Position, Velocity and Time data estimation of position can send according to the last time time obtain.And when the transport condition of vehicle changes, for example quicken, to slow down, in the time of turning, promptly Δ V, ΔΦ are big, shorten the transmission time interval of positional information.Exist a kind of inverse relation between Δ T and Δ V, the ΔΦ as can be seen, summarize a formula that meets above-mentioned relation and actual conditions thus promptly:
Δ T
n=KF (Δ V
n, ΔΦ
n)=K/ (a| Δ V
n|+b| ΔΦ
nThe formula of |+c) 5
Wherein K is one greater than zero constant; A and b are the amplification coefficient (a＞0, b＞0) of Δ V, ΔΦ, are used for regulating Δ V, the ΔΦ influence to Δ T; It is zero that c (c＞0) is used for avoiding denominator.K, a, b and c can be provided with according to concrete needs.When vehicle at the uniform velocity travelled, Δ V, ΔΦ were equal to 0, and then Δ T equals K/c, makes T
Max=K/c obtains the time interval maximum between twice transmission, does not change even show the running status of vehicle, every T
MaxAlso must send a positional information, be 30 seconds if wish maximum transmission time interval, then T
Max=K/c=30.
The Δ T that calculates according to above-mentioned formula, still can't be used for determining whether needing to send vehicle position information, this is because the transport condition of vehicle can change again probably in the Δ T time period, and the frequency of calculating Δ T is identical with the sample frequency of speed V, angular speed φ, therefore may produce several new Δ T values during this period of time again at Δ T.
If yet can satisfy following conditions simultaneously, that is:
1.ΔT
n＜ΔT
n-1；
2. the current record time value T＞Δ T of timer
n
Δ T
n＜Δ T
N-1More significant variation has taken place than the transport condition in the moment (sampling time) of previous estimation Δ T in the transport condition that vehicle is described; T＞Δ T
nIllustrate current time to last time delivery time this section duration surpassed Δ T
n, do not need to have waited for therefore that vehicular communication equipment needs to send vehicle position information to GPRS network immediately, after vehicle transmission positional information finished, the present timing value T of timer need put 0, restarts timing then.
If above-mentioned two conditions can not satisfy simultaneously, this shows it might is that more significant variation has not taken place for the running status of vehicle, also may be that current time is also too short during this period of time to the moment of transmission last time, therefore only needing to upgrade the timing length that timer is set be Δ T
n
Need to prove because Δ T
n≤ T
MaxSo, needing two satisfied conditions as can be known by sending, T can not surpass T
Max, illustrate that under extreme case for example uniform motion or inactive state are every T
MaxTime, vehicular communication equipment just should send vehicle position information one time to GPRS network, is sent to the dispatching and monitoring center behind internet, is gathered by the dispatching and monitoring center at last and handles, and draws road traffic condition.
Claims (7)
1, a kind of vehicular communication equipment includes signal receiving device, sender unit, CPU, speed data interface, data storage cell and data/address bus; Above-mentioned CPU is connected with signal receiving device, sender unit, data storage cell and speed data interface respectively by data/address bus, and it is characterized in that: above-mentioned CPU can be finished following operation:
Produce the clock sampling signal of certain frequency;
Timer is set and with its initialization;
Be converted to vehicle position information after the vehicle latitude and longitude information that will from signal receiving device, obtain;
Sample when the data that the speed data interface is sent wait, and with the storage that collects in data storage cell;
Judge after memory data output reaches the sampling number N of setting, from data storage cell, obtain the time interval that data computation sends vehicle position information;
Calculate the time interval that sends vehicle position information, judge if this time interval littler and also the current time value than the timer record is little than the preceding time interval of once calculating, then send instruction to sender unit, by sender unit vehicle position information is sent, give writing time of timer simultaneously and be worth zero clearing.
2, vehicular communication equipment according to claim 1, it is characterized in that: this vehicular communication equipment also includes direction sensor, this direction sensor is connected with above-mentioned CPU by data/address bus, when this CPU can wait the data that the direction transducer sends sampling and with the storage that collects in data storage cell, and the time interval that can from data storage cell, obtain data computation transmission vehicle position information.
3, vehicular communication equipment according to claim 2 is characterized in that: described signal receiving device is made up of signal receiving antenna and signal receiving module; Described sender unit is made up of signal transmitting antenna and signal transmitting module.
4, a kind of information processing method that uses above-mentioned vehicular communication equipment, it is characterized in that: it includes following steps,
Vehicular communication equipment receives latitude and longitude information, and obtains vehicle position information after handling; When the data that direction sensor, speed data interface send to CPU, CPU etc. after the sampling, with the storage that collects in data storage cell; When the data total amount that deposits data storage cell in reaches default sampling number N, CPU calculates speed and angular speed sample average after obtaining data, calculate speed and angular speed sample average variable quantity again, draw the time interval that sends vehicle position information then, if judge should the time interval littler and also the current time value than the timer record is little than the preceding time interval of once calculating, so just be sent to wireless network, data are sent to the dispatching and monitoring center, the information that the vehicle transmission is gathered at the dispatching and monitoring center draws road traffic condition after treatment again.
5, the information processing method of the above-mentioned vehicular communication equipment of use according to claim 4 is characterized in that: the formula of computational speed and angular speed sample average is
Wherein, V
nN the speed average that expression need be tried to achieve, Φ
nN the angular speed average that expression need be tried to achieve; N is the positive integer greater than 1, each V or the Φ sample value number that participates in calculating of expression; P is a percentage, represents the most contiguous V or Φ sample value shared proportion in N sample value altogether.
6, the information processing method of the above-mentioned vehicular communication equipment of use according to claim 4 is characterized in that: the formula that calculates speed and angular speed sample average variable quantity is
Δ V
n＝ V
n- V
n-1
Δ Φ
n＝ Φ
n- Φ
n-1
Δ V and ΔΦ are corresponding angular speed, speed Change in Mean amount.
7, the transport information control method of the above-mentioned vehicular communication equipment of use according to claim 4 is characterized in that: the formula that calculates the time interval that sends vehicle position information is
ΔT
n＝K·F(Δ V
n，Δ Φ
n)＝K/(a·|Δ V
n|+b·|Δ Φ
n|+c)
K is one greater than zero constant; A and b are the amplification coefficient of Δ V, ΔΦ, are used for regulating Δ V, the ΔΦ influence to Δ T; It is zero that c is used for avoiding denominator, and a, b and c are the positive number greater than zero.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021124795A CN100391127C (en) | 2002-07-11 | 2002-07-11 | Vehicle mounted communication apparatus and traffic information processing method using the same |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021124795A CN100391127C (en) | 2002-07-11 | 2002-07-11 | Vehicle mounted communication apparatus and traffic information processing method using the same |
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| CN100391127C CN100391127C (en) | 2008-05-28 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100429905C (en) * | 2004-02-09 | 2008-10-29 | 西安美太信息有限公司 | Traffic information automatic acquisition and management method |
| CN100579104C (en) * | 2004-04-08 | 2010-01-06 | 中国科学院计算技术研究所 | Method of automatically notifying automobile violation treatment by utilizing radio internet |
| CN1796941B (en) * | 2004-12-30 | 2010-04-21 | 华为技术有限公司 | Car borne communication and navigation equipment for realization of detecting cars mobilely and remotely detection |
| CN103475740A (en) * | 2013-09-29 | 2013-12-25 | 徐州重型机械有限公司 | Vehicle GPS remote terminal data sending method and GPS remote terminal |
| CN104125020A (en) * | 2013-04-23 | 2014-10-29 | 宏达国际电子股份有限公司 | Wireless signal searching method and mobile electronic device |
| CN107466011A (en) * | 2017-08-16 | 2017-12-12 | 广东海翔教育科技有限公司 | A kind of vehicle electronic device communication means |
| CN108134846A (en) * | 2018-02-01 | 2018-06-08 | 广东聚晨知识产权代理有限公司 | A kind of vehicle-mounted Internet control system |
| CN109541661A (en) * | 2018-11-13 | 2019-03-29 | 中国联合网络通信集团有限公司 | A kind of localization method and device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1026734C (en) * | 1992-02-15 | 1994-11-23 | 孙建民 | Monitoring and controlling system for running of motor vehicle |
| CN1208908A (en) * | 1997-08-20 | 1999-02-24 | 天一电子通信系统株式会社 | Managing method for vehicle service information |
-
2002
- 2002-07-11 CN CNB021124795A patent/CN100391127C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100429905C (en) * | 2004-02-09 | 2008-10-29 | 西安美太信息有限公司 | Traffic information automatic acquisition and management method |
| CN100579104C (en) * | 2004-04-08 | 2010-01-06 | 中国科学院计算技术研究所 | Method of automatically notifying automobile violation treatment by utilizing radio internet |
| CN1796941B (en) * | 2004-12-30 | 2010-04-21 | 华为技术有限公司 | Car borne communication and navigation equipment for realization of detecting cars mobilely and remotely detection |
| CN104125020A (en) * | 2013-04-23 | 2014-10-29 | 宏达国际电子股份有限公司 | Wireless signal searching method and mobile electronic device |
| CN104125020B (en) * | 2013-04-23 | 2017-03-01 | 宏达国际电子股份有限公司 | Wireless signal method for searching and electronic apparatus |
| CN103475740A (en) * | 2013-09-29 | 2013-12-25 | 徐州重型机械有限公司 | Vehicle GPS remote terminal data sending method and GPS remote terminal |
| CN107466011A (en) * | 2017-08-16 | 2017-12-12 | 广东海翔教育科技有限公司 | A kind of vehicle electronic device communication means |
| CN108134846A (en) * | 2018-02-01 | 2018-06-08 | 广东聚晨知识产权代理有限公司 | A kind of vehicle-mounted Internet control system |
| CN109541661A (en) * | 2018-11-13 | 2019-03-29 | 中国联合网络通信集团有限公司 | A kind of localization method and device |
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|---|---|
| CN100391127C (en) | 2008-05-28 |
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