CN100334462C - Vehicle positioning system - Google Patents
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- CN100334462C CN100334462C CNB031787517A CN03178751A CN100334462C CN 100334462 C CN100334462 C CN 100334462C CN B031787517 A CNB031787517 A CN B031787517A CN 03178751 A CN03178751 A CN 03178751A CN 100334462 C CN100334462 C CN 100334462C
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Abstract
The present invention relates to a vehicle positioning system using integral packaging radio service (GPRS) to connect internet and servos for carrying out communication. The vehicle positioning system comprises an antenna, a global positioning system(GPS) component, a main system control component, a network format converting component and a GPRS component, wherein the antenna is used for receiving first analog information from satellites; the GPS component is used for converting the first analog information into first digital information; the main system control component is used for converting the first digital information into digital information and uses a bus to transfer the second digital information to a communication component; the network format converting component is connected to the communication component and is used for converting the second digital information into third digital information; the GPRS component is used for converting the third digital information into second analog information and transferring the second analog information to servos through internet connected with GPRS.
Description
(1) technical field
(Automatic Vehicle Location System AVLS), especially links the Vehicle positioning system that internet and servomechanism carry out communication about a kind of whole packet radio (GPRS) of utilizing to the invention relates to a kind of Vehicle positioning system.
(2) background technology
Along with the arriving in mobile epoch, the use of Vehicle positioning system (wagon weighing machine again) is day by day general, and the day of its range of application more extensively.Along with moving of vehicle, the car chance from the received position data such as longitude and latitude of satellite, is sent to base station with it, to reach the function of satnav.In known techniques, the communication between car machine and the base station is that (Short Message Service SMS) finishes, and promptly the car machine is that data such as longitude and latitude are write news in brief, and utilizes SMS to be sent to base station for SMS (Short Message Service) by wireless telephony network.Yet it is limited to utilize SMS to carry out the communication speed that the communication between car machine and the base station can reach, and required cost is also high.
(3) summary of the invention
Therefore, fundamental purpose of the present invention is to provide a kind of Vehicle positioning system of utilizing whole packet radio business (GPRS) binding internet and servomechanism to carry out communication, with reduction communication cost, and accelerates communication speed.
Vehicle positioning system of the present invention is to link the internet via a GPRS to be connected in a servomechanism again.This Vehicle positioning system comprises an antenna, is used for receiving one first analog information from a satellite; One Global Positioning System (GPS) (Global Positioning System, GPS) assembly is connected in this antenna, is used for converting this first analog information to one first numerical information, and wherein this first numerical information has one first data layout; One main system Control Component is connected in this GPS assembly, is used for converting this first numerical information to one second numerical information, and wherein this second numerical information has one second data layout; One bus is connected in this main system Control Component, and wherein this main system Control Component is to transmit this second numerical information by this bus; One communication part is connected between this bus and this network format transition components, is used for utilizing second numerical information of this bus reception from this main system Control Component, so that this second numerical information is sent to this network format transition components; One network format transition components is connected in this communication part, is used for converting this second numerical information to one the 3rd numerical information, and wherein the 3rd numerical information has a network data form; An and whole packet radio business (General Packet Radio Service, GPRS) assembly, be connected in this network format transition components, be used for converting the 3rd numerical information to one second analog information, and this second analog information is sent to this servomechanism via this internet.
When this servomechanism transmits one the 3rd analog information to this Vehicle positioning system, this GPRS assembly can convert the 3rd analog information to one the 4th numerical information, and be sent to this network format transition components, wherein the 4th numerical information has this network data form; This network format transition components can convert the 4th numerical information to one the 5th numerical information, and the 5th numerical information is sent to this communication part, and wherein the 5th numerical information has this second data layout; And this communication part can utilize this bus to send the 5th numerical information from this network format transition components, the 5th numerical information is sent to this main system Control Component.
(4) description of drawings
Fig. 1 is the synoptic diagram of Vehicle positioning system of the present invention.
Fig. 2 is the synoptic diagram of supplemental characteristic.
Fig. 3 carries out the process flow diagram that transmits flow process for Vehicle positioning system of the present invention.
Fig. 4 carries out the process flow diagram that transmits flow process for Vehicle positioning system of the present invention.
Fig. 5 is that first peripheral device is carried out the process flow diagram that transmits information flow.
(5) embodiment
For can clearer understanding technology contents of the present invention, be described as follows especially exemplified by a preferred embodiment.
Please refer to Fig. 1.Fig. 1 is the synoptic diagram of Vehicle positioning system 10 of the present invention.Vehicle positioning system 10 is to be connected in a servomechanism 14 via an internet 12.Vehicle positioning system 10, for example the car machine is to be installed in the vehicle, will be sent to servomechanism 14 from the locator data of satellite.Locator data comprises the position data of the vehicle that Vehicle positioning system 10 is installed, i.e. the longitude and latitude of vehicle position, angle, the speed of vehicle, and data such as date, time.In addition, servomechanism 14 also can utilize interconnected 12 data are sent to car machine (Vehicle positioning system 10).
As shown in the figure, Vehicle positioning system 10 comprises a storage device 30 in addition, is used for storing a supplemental characteristic 34; And a connectivity port 32, be used for Vehicle positioning system 10 is connected in a computer (not shown).
Please refer to Fig. 2.Fig. 2 is the synoptic diagram of supplemental characteristic 34.Supplemental characteristic 34 comprises an identification code 36, corresponding to Vehicle positioning system 10; One network address 38 allows the position of Vehicle positioning system 10 Data transmission servomechanism 14 on internet 12; And one data access set 40 at interval, be used for setting a data time.Main system Control Component 20 is to receive first numerical information according to data time from GPS assembly 18.For example, data time can be set at 20 seconds, and main system Control Component 20 then can grasp data from GPS assembly 18 every 20 seconds time.
Generally speaking, Vehicle positioning system 10 can enter two kinds of operator schemes, a kind of parameter setting pattern, and another is satellite data reception/transfer mode.The user can manual mode carry out the switching of pattern.When Vehicle positioning system 10 is in the parameter setting pattern, can revise its supplemental characteristic 34, and when Vehicle positioning system 10 is in satellite data reception/transfer mode, then can continue from satellite received signal being sent to servomechanism 14, or receive data from servomechanism.In addition, also Vehicle positioning system 10 can be designed to be connected in computer, when Vehicle positioning system 10 is connected in computer, and computer can allow computer become satellite navigation system when electronic chart is installed.
When Vehicle positioning system 10 is when being in the parameter setting pattern, GPS assembly 18 can not be sent to received satellite-signal the main system Control Component, and this time, Vehicle positioning system 10 normally is connected in a computer, the user then can utilize computer to carry out parameter setting, promptly revises supplemental characteristic 34.Except utilizing computer to carry out the parameter setting, also can utilize the servomechanism 14 of far-end to revise supplemental characteristic 34, so Vehicle positioning system 10 also need not be connected in computer.In the present embodiment, when using Vehicle positioning system 10 for the first time, the user must be by being connected in computer to carry out primary parameter setting.
As shown in Figure 1, bus 22 is to be connected in main system Control Component 20.Main system Control Component 20 is to transmit second numerical information by bus 22, and main system Control Component 20 can be from storage device 30 accesses and the data 34 that pass a parameter.Communication part 24 is to be connected between bus 22 and the network format transition components 26, be used for utilizing bus 22 to receive second numerical information and the supplemental characteristic 34 of autonomous system Control Component 20, so that second numerical information and supplemental characteristic 34 are sent to network format transition components 26.Network format transition components 26 is to be connected in communication part 24, is used for converting second numerical information to one the 3rd numerical information together with supplemental characteristic 34.Wherein, the 3rd numerical information has a network data form, for example, and network communication agreement (Transmission Control Protocol/Internet Protocol, TCP/IP) data layout.GPRS assembly 28 is to be connected in network format transition components 26, is used for converting the 3rd numerical information to one second analog information, and second analog information is sent to servomechanism 14 via 12 internets.
In addition, Vehicle positioning system 10 comprises first perimeter component 42 and second perimeter component 44 in addition, is connected in bus 22, and is connected to first peripheral device 46 and second peripheral device 48.First peripheral device 46 can be a card reader, and second peripheral device 48 then can be a machine for punching the card, to increase the range of application of Vehicle positioning system 10.
Please refer to Fig. 3.Fig. 3 carries out the process flow diagram that transmits flow process 50 for Vehicle positioning system 10 of the present invention.In step 51, antenna 16 can receive first analog information from the satellite (not shown), i.e. satellite-signal.In step 52, GPS assembly 18 can convert first analog information to first numerical information.In step 53, main system Control Component 20 can convert first numerical information to second numerical information, and second numerical information is sent to communication part 24 via bus 22.In step 54, communication part 24 can receive and be sent to network format transition components 26 from second numerical information and with second numerical information and supplemental characteristic 34.In step 55, network format transition components 26 can convert second numerical information to the 3rd numerical information together with supplemental characteristic 34.In step 56, the GPRS assembly can convert the 3rd numerical information to second analog information, and second analog information is sent to servomechanism 14 via internet 12.
When transmitting failure, network format transition components 26 can transmit an error message to communication part 24, and communication part 24 can be sent to main system Control Component 20 by bus 22.Then, main system Control Component 20 can enter an error handler according to error code contained in the error message.For example, when error code represented that servomechanism 14 is not opened as yet, Vehicle positioning system 10 can enter an error handler with the information of retransferring.Therefore, main system Control Component 20 grasps data to GPS assembly 18 again, once transmits flow process 50 and make Vehicle positioning system 10 re-execute.
Please refer to Fig. 4.Fig. 4 carries out the process flow diagram that transmits flow process 60 for Vehicle positioning system 10 of the present invention.When servomechanism 14 transmission information (the 3rd analog information) during to Vehicle positioning system 10, Vehicle positioning system 10 can be carried out and transmit flow processs 60.In step 61, GPRS assembly 28 can receive the 3rd analog information, and converts the 3rd analog information to the 4th numerical information, to be sent to network format transition components 26.Wherein, the 4th numerical information has the network data form.
In step 62, network format transition components 26 can convert the 4th numerical information to the 5th numerical information, and the 5th numerical information is sent to communication part 24.Wherein, the 5th numerical information has second data layout.In step 63, communication part 24 can utilize bus 22 to send the 5th numerical information of automatic network format conversion assembly 26, so that the 5th numerical information is sent to main system Control Component 20.
In step 64, main system Control Component 20 can judge whether the 5th numerical information comprises specific data.If, then entering step 65,20 of main system Control Components can be revised supplemental characteristic 34 according to the 5th numerical information, to finish the work of parameter setting.If not, then enter step 66,20 of main system Control Components can be sent to the specified peripheral device of specific data 46 or 48 with the 5th numerical information via bus 22 according to specific data.
From the above, main system Control Component 20 can decide follow-up operation according to the data content from servomechanism 14.If data content is the parameter correlation data, main system Control Component 20 can change parameter setting according to this data content so.If data content is the peripheral device related data, 20 of main system Control Components can send data to specified peripheral device according to the designated code that is included in the data, for example, and card reader or machine for punching the card.
Please refer to Fig. 5.Fig. 5 is that first peripheral device 46 is carried out the process flow diagram that transmits information flow 70.As shown in Figure 1, first and second peripheral device 46,48th is connected in Vehicle positioning system 10, so first and second peripheral device 46,48 can utilize Vehicle positioning system 10 and servomechanism 14 to carry out communication, also can utilize Vehicle positioning system 10 mutual communications.With first peripheral device 46 is example, and in step 71, first peripheral device 46 produces first peripheral information, and first peripheral information is sent to first perimeter component 42.Then, in step 72, first perimeter component 42 can judge whether the contained specific data of first peripheral information points to second peripheral device 48.
If then enter step 73.At this moment, data to the second peripheral device 48 is sent in 46 tendencies to develop of first peripheral device, and therefore, first perimeter component 42 can be sent to second perimeter component 44 with first peripheral information by bus 22.
If not, then enter step 74.At this moment, 46 tendencies to develop of first peripheral device send data to servomechanism 14.Therefore, first perimeter component 42 can be sent to communication part 24 with first peripheral information by bus 22.Then, in step 75, communication part 24 can be sent to network format transition components 26 with first peripheral information.In step 76, network format transition components 26 just first peripheral information converts the 3rd numerical information to, and is sent to GPRS assembly 28.At last, in step 77, GPRS assembly 28 can convert the 3rd numerical information to second analog information, and second analog information is sent to servomechanism 14 via internet 12.
In sum, Vehicle positioning system 10 of the present invention is to utilize GPRS to be connected to the internet and servomechanism 14 carries out communication, and therefore, compared to known techniques, the present invention not only can reduce the communication cost, more can accelerate communication speed, to promote communication quality.
The foregoing description only is illustrative principle of the present invention and effect thereof, but not is used to limit the scope of the invention.Any person skilled in the art person all can be under know-why of the present invention and spirit, and embodiment is made an amendment and changes.Protection scope of the present invention should be claim described as follows institute restricted portion.
Claims (22)
1. Vehicle positioning system, comprises in a servomechanism via an Internet connection:
One antenna is used for receiving one first analog information from a satellite;
One Global Positioning System (GPS) assembly is connected in this antenna, is used for converting this first analog information to one first numerical information, and wherein this first numerical information has one first data layout;
One main system Control Component is connected in this Global Positioning System (GPS) assembly, is used for converting this first numerical information to one second numerical information, and wherein this second numerical information has one second data layout;
One network format transition components is connected in this main system Control Component, is used for converting this second numerical information to one the 3rd numerical information, and wherein the 3rd numerical information has a network data form; And
One whole packet radio Service Component is connected in this network format transition components, is used for converting the 3rd numerical information to one second analog information, and this second analog information is sent to this servomechanism via this internet;
Wherein when this servomechanism transmits one the 3rd analog information to this Vehicle positioning system, this integral body packet radio Service Component can convert the 3rd analog information to one the 4th numerical information, and be sent to this network format transition components, wherein the 4th numerical information has this network data form; And
This network format transition components can convert the 4th numerical information to one the 5th numerical information, and the 5th numerical information is sent to this main system Control Component, and wherein the 5th numerical information has this second data layout.
2. Vehicle positioning system as claimed in claim 1 is characterized in that other comprises a storage device, is used for storing a supplemental characteristic; Wherein when this servomechanism transmitted the 3rd analog information to this Vehicle positioning system, this main system Control Component can be revised this supplemental characteristic according to the 5th numerical information that the 3rd analog information is converted; And when this main system Control Component is sent to this network format transition components with this second numerical information, also this supplemental characteristic can be sent to this network format transition components, and this network format transition components can convert this second numerical information to one the 3rd numerical information together with this supplemental characteristic, and is sent to this integral body packet radio Service Component.
3. Vehicle positioning system as claimed in claim 2 is characterized in that, this supplemental characteristic comprises:
One identification code is corresponding to this Vehicle positioning system;
One network address is used for indicating the position of this Vehicle positioning system on this internet; And
One data access is set at interval, is used for setting a data time;
Wherein this main system Control Component is to receive this first numerical information according to this data time from this Global Positioning System (GPS) assembly.
4. Vehicle positioning system as claimed in claim 1 is characterized in that other comprises:
One bus is connected in this main system Control Component, and wherein this main system Control Component is to transmit this second numerical information by this bus; And
One communication part, be connected between this bus and this network format transition components, be used for utilizing second numerical information of this bus reception from this main system Control Component, so that this second numerical information is sent to this network format transition components, and will utilize this bus to send the 5th numerical information, the 5th numerical information is sent to this main system Control Component from this network format transition components.
5. Vehicle positioning system as claimed in claim 4 is characterized in that other comprises at least one perimeter component, is connected in this bus, to be connected in a peripheral device; Wherein when this peripheral device produced one first peripheral information, this peripheral device can be sent to this first peripheral information its pairing perimeter component.
6. Vehicle positioning system as claimed in claim 5, it is characterized in that, this first peripheral information comprises a specific data, when this specific data is when pointing to this servomechanism, this perimeter component can be sent to this communication part with this first peripheral information by this bus, so that this peripheral information is sent to this servomechanism, and when this specific data be when pointing to another peripheral device, this perimeter component can be sent to this designated code perimeter component pointed with this first peripheral information by this bus.
7. Vehicle positioning system as claimed in claim 5, it is characterized in that, the 3rd analog information that this servomechanism transmitted comprises a specific data, be used for specifying a peripheral device, when this main system Control Component receives from the 5th numerical information that the 3rd analog information converts, can the 5th numerical information be sent to the specified peripheral device of this specific data via this bus according to this specific data.
8. Vehicle positioning system as claimed in claim 2 is characterized in that other comprises a connectivity port, is used for being connected in a computer, and wherein a user can revise this supplemental characteristic by this computer.
9. Vehicle positioning system as claimed in claim 4 is characterized in that other comprises a storage device, is used for storing a supplemental characteristic; Wherein when this servomechanism transmitted the 3rd analog information to this Vehicle positioning system, this main system Control Component can be revised this supplemental characteristic according to the 5th numerical information that the 3rd analog information is converted; And wherein when this main system Control Component is sent to this network format transition components with this second numerical information, also this supplemental characteristic can be sent to this network format transition components, and this network format transition components can convert this second numerical information to one the 3rd numerical information together with this supplemental characteristic, and is sent to this integral body packet radio Service Component.
10. Vehicle positioning system as claimed in claim 9 is characterized in that, this supplemental characteristic comprises:
One identification code is corresponding to this Vehicle positioning system;
One network address is used for indicating the position of this Vehicle positioning system on this internet; And
One data access is set at interval, is used for setting a data time;
Wherein this main system Control Component is to receive this first numerical information according to this data time from this Global Positioning System (GPS) assembly.
11. Vehicle positioning system as claimed in claim 9 is characterized in that, other comprises a connectivity port, is used for being connected in a computer, and wherein a user can revise this supplemental characteristic by this computer.
12. means of communication are applied in the Vehicle positioning system, wherein this Vehicle positioning system be via an Internet connection in a servomechanism, and these means of communication comprise:
One transmits flow process, and wherein when this Vehicle positioning system transmitted an information to this servomechanism, this Vehicle positioning system can be carried out this transmission flow process, and this transmission flow process comprises:
The antenna of this Vehicle positioning system receives one first analog information from a satellite;
The Global Positioning System (GPS) assembly of this Vehicle positioning system converts this first analog information to one first numerical information, and wherein this first numerical information has one first data layout;
The main system Control Component of this Vehicle positioning system converts this first numerical information to one second numerical information, and wherein this second numerical information has one second data layout;
The network format transition components of this Vehicle positioning system converts this second numerical information to one the 3rd numerical information, and wherein the 3rd numerical information has a network data form; And
The whole packet radio Service Component of this Vehicle positioning system converts the 3rd numerical information to one second analog information, and this second analog information is sent to this servomechanism via this internet; And
One receives flow process, and wherein when this servomechanism transmitted an information to this Vehicle positioning system, this Vehicle positioning system can be carried out this reception flow process, and this reception flow process comprises:
This integral body packet radio Service Component receives one the 3rd analog information from this servomechanism, and convert the 3rd analog information to one the 4th numerical information, and be sent to this network format transition components, wherein the 4th numerical information has this network data form; And
This network format transition components converts the 4th numerical information to one the 5th numerical information, and the 5th numerical information is sent to this main system Control Component, and wherein the 5th numerical information has this second data layout.
13. the means of communication as claimed in claim 12 is characterized in that, this Vehicle positioning system comprises a storage device in addition, is used for storing a supplemental characteristic;
Wherein when this servomechanism transmitted the 3rd analog information to this Vehicle positioning system, this main system Control Component can be revised this supplemental characteristic according to the 5th numerical information that the 3rd analog information is converted; And
When this main system Control Component is sent to this network format transition components with this second numerical information, also this supplemental characteristic can be sent to this network format transition components, and this network format transition components can convert this second numerical information to one the 3rd numerical information together with this supplemental characteristic, and is sent to this integral body packet radio Service Component.
14. the means of communication as claimed in claim 13 is characterized in that, this supplemental characteristic comprises:
One identification code is corresponding to this Vehicle positioning system;
One network address is used for indicating the position of this Vehicle positioning system on this internet; And
One data access is set at interval, is used for setting a data time;
Wherein this main system Control Component is to receive this first numerical information according to this data time from this Global Positioning System (GPS) assembly.
15. the means of communication as claimed in claim 12 is characterized in that, this Vehicle positioning system comprises in addition:
One bus is connected in this main system Control Component, and wherein this main system Control Component is to transmit this second numerical information by this bus; And
One communication part, be connected between this bus and this network format transition components, be used for utilizing second numerical information of this bus reception from this main system Control Component, so that this second numerical information is sent to this network format transition components, and will utilize this bus to send the 5th numerical information, the 5th numerical information is sent to this main system Control Component from this network format transition components.
16. the means of communication as claimed in claim 15 is characterized in that, this Vehicle positioning system comprises at least one perimeter component in addition, is connected in this bus, to be connected in a peripheral device;
Wherein when this peripheral device produced one first peripheral information, this peripheral device can be sent to this first peripheral information its pairing perimeter component.
17. the means of communication as claimed in claim 16, it is characterized in that, this first peripheral information comprises a specific data, when this specific data is when pointing to this servomechanism, this perimeter component can be sent to this communication part with this first peripheral information by this bus, so that this peripheral information is sent to this servomechanism, and when this specific data be when pointing to another peripheral device, this perimeter component can be sent to this designated code perimeter component pointed with this first peripheral information by this bus.
18. the means of communication as claimed in claim 16, it is characterized in that, the 3rd analog information that this servomechanism transmitted comprises a specific data, be used for specifying a peripheral device, when this main system Control Component receives from the 5th numerical information that the 3rd analog information converts, can the 5th numerical information be sent to the specified peripheral device of this specific data via this bus according to this specific data.
19. the means of communication as claimed in claim 13 is characterized in that, this Vehicle positioning system comprises a connectivity port in addition, is used for being connected in a computer, and wherein a user can revise this supplemental characteristic by this computer.
20. the means of communication as claimed in claim 15 is characterized in that, this Vehicle positioning system comprises a storage device in addition, is used for storing a supplemental characteristic;
Wherein when this servomechanism transmitted the 3rd analog information to this Vehicle positioning system, this main system Control Component can be revised this supplemental characteristic according to the 5th numerical information that the 3rd analog information is converted; And
Wherein when this main system Control Component is sent to this network format transition components with this second numerical information, also this supplemental characteristic can be sent to this network format transition components, and this network format transition components can convert this second numerical information to one the 3rd numerical information together with this supplemental characteristic, and is sent to this GPRS assembly.
21. the means of communication as claimed in claim 20 is characterized in that, this supplemental characteristic comprises:
One identification code is corresponding to this Vehicle positioning system;
One network address is used for indicating the position of this Vehicle positioning system on this internet; And
One data access is set at interval, is used for setting a data time;
Wherein this main system Control Component is to receive this first numerical information according to this data time from this Global Positioning System (GPS) assembly.
22. the means of communication as claimed in claim 20 is characterized in that, other comprises a connectivity port, is used for being connected in a computer, and wherein a user can revise this supplemental characteristic by this computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031787517A CN100334462C (en) | 2003-07-18 | 2003-07-18 | Vehicle positioning system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031787517A CN100334462C (en) | 2003-07-18 | 2003-07-18 | Vehicle positioning system |
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| CN1570667A CN1570667A (en) | 2005-01-26 |
| CN100334462C true CN100334462C (en) | 2007-08-29 |
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| CNB031787517A Expired - Fee Related CN100334462C (en) | 2003-07-18 | 2003-07-18 | Vehicle positioning system |
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| CN101131421B (en) * | 2006-08-25 | 2011-12-28 | 佛山市顺德区顺达电脑厂有限公司 | Ephemeris data processing method |
Citations (3)
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|---|---|---|---|---|
| CN1285518A (en) * | 2000-09-05 | 2001-02-28 | 泉州海洋高科技电子有限公司 | Positioning communication assembling system |
| EP1215508A1 (en) * | 2000-12-06 | 2002-06-19 | Lucent Technologies Inc. | Wireless position location system and method using differential global system information and general packet radio switching technology |
| CN1381779A (en) * | 2002-04-30 | 2002-11-27 | 武汉奥发科技工程有限公司 | Method for positioning and displaying moving target on electronic map and inquiring other moving targets |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1285518A (en) * | 2000-09-05 | 2001-02-28 | 泉州海洋高科技电子有限公司 | Positioning communication assembling system |
| EP1215508A1 (en) * | 2000-12-06 | 2002-06-19 | Lucent Technologies Inc. | Wireless position location system and method using differential global system information and general packet radio switching technology |
| CN1381779A (en) * | 2002-04-30 | 2002-11-27 | 武汉奥发科技工程有限公司 | Method for positioning and displaying moving target on electronic map and inquiring other moving targets |
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