CN1920482A - Processing of navigation track in vehicle online type navigation system and transportation method thereof - Google Patents
Processing of navigation track in vehicle online type navigation system and transportation method thereof Download PDFInfo
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Abstract
The invention relates to a method for processing and transmitting navigation path in vehicle network navigation system, wherein it comprises: storing the key point information relative to the roads in electric map of navigation center; extracting the navigation path from electric map, while said navigation path comprises each key point of navigation path; based on the key point information, matching instruction information code to each key code, and combining the coordinate of each key point with the instruction information code into one group of report; wireless transmitting said report to the carrier terminal; the carrier terminal, based on the report, extracts and plays navigation instruction information relative to the each key point navigation instruction information code from the database of carrier terminal, to navigate the vehicle. The invention only transmits the coordinate of each key point and relative navigation instruction information code, with less data and short transmission time, to improve the navigation success.
Description
Technical field
The present invention relates to vehicle online type navigation system, be meant that specifically navigation center in the vehicle online type navigation system is to the processing of guidance path and to the method for mobile unit transmission guidance path.
Background technology
Automobile navigation and location are new techniques that grows up on the basis of Global Positioning System (GPS) GPS.At present, Vehicular navigation system has two kinds, and a kind of is independent navigation, and another kind is the network type navigation.
Independent navigation is realized by mounting vehicle omniselector on vehicle, the automobile navigation device must be equipped with electronic chart, must be able to receive the positioning signal of gps satellite, need to have the processing power of electronic chart and the ability that route is calculated simultaneously, so this automobile navigation device more complicated, price is also relatively more expensive, and domestic consumer is difficult to bear, thereby is difficult to be popularized.
And in the network type navigation, do not need to install electronic chart on its automobile navigation device, also need not simultaneously the route computing power, the automobile navigation device only needs to carry out work according to downloading the routing information that comes from navigation center, and electronic chart is installed on the navigation server of navigation center, electronic map updating, search, route are calculated and are undertaken by navigation server, reduce the price of automobile navigation device thus.Because automobile navigation device price is lower, accepted by the consumer easily, therefore, the main flow of network type navigation becoming automobile navigation.
In the design of above-mentioned automobile networking navigation Service system, automobile networking navigation procedure is divided into three phases: the phase one, the car-mounted terminal that is installed on vehicle is reported the vehicle current location information by GPRS navigation center; The staff that subordinate phase, car-mounted terminal are dialed the navigation Service phone of navigation center and navigation center automatically definite terminal point of conversing, the staff of navigation center operates accordingly to realize navigation task; Phase III, car-mounted terminal carries out navigation hint by GPRS navigation center requests routing information and according to the routing information that receives to vehicle.Because navigation center is sending in the process of navigation route information to car-mounted terminal, vehicle be not rest on as you were, but still ceaselessly travelling, therefore, if the transmission time of this guidance path is long, probably vehicle away from the starting point of guidance path, far apart with it, this guidance path has also just lost meaning.Therefore, how navigation route information is handled and transmitted, determined the success or not of navigation to a great extent.
Summary of the invention
The invention provides the processing and the transmission method of guidance path in a kind of vehicle online type navigation system, its fundamental purpose is to make guidance path to transfer to car-mounted terminal by navigation center in the enough short time, so that car-mounted terminal can be received required guidance path in the short period after it sends navigation requests, thereby avoid delay navigation opportunity.
The present invention adopts following technical scheme:
The processing of guidance path and transmission method in the vehicle online type navigation system comprise: 1) the crossing key point information one to one in storage and the real road in the electronic chart of navigation center; 2) extract navigation route information from electronic chart, this navigation route information comprises each key point information on the guidance path; 3) according to each key point information, be respectively each key point coupling navigation hint message code, the coordinate and the navigation hint message code of each key point on the guidance path are formed one group of message; 5) this message is sent to car-mounted terminal with wireless transmission method from navigation center; 6) car-mounted terminal extracts navigation hint information corresponding with each key point navigation hint message code and broadcast, so that vehicle is carried out navigation hint according to this message from the database that is pre-stored in car-mounted terminal.As seen, what be transferred to car-mounted terminal transmission from navigation center only is the coordinate and the navigation hint message code of each key point on the guidance path, rather than navigation hint itself, so its transmission time is extremely short.
The processing and the transmission method of guidance path in the aforementioned vehicle network type navigational system, wherein, described key point information comprises the coordinate and the direction information of this key point at least, the real-time position information that the coordinate of key point is used for receiving with car-mounted terminal compares, determine playing the opportunity of navigation hint information, but whichaway turns round when direction information is represented vehicle through the crossing of this key point correspondence.
The processing and the transmission method of guidance path in the aforementioned vehicle network type navigational system, wherein, described navigation hint information comprises information of voice prompt and picture cues information, information of voice prompt is a brief statement, inform by the mode of voice how human pilot crossing forwardly turns to, picture cues information one shows the icon of junction ahead shape and rotation arrow.
The processing and the transmission method of guidance path in the aforementioned vehicle network type navigational system, wherein, this message is adopted the TCP transmission mode of GPRS network or cdma network when navigation center is sent to car-mounted terminal, and TCP itself is exactly a reliable transmission mechanism, need not increase transmission control.
The processing and the transmission method of guidance path in the aforementioned vehicle network type navigational system, wherein, with this message when navigation center is sent to car-mounted terminal, adopt reliable transport protocol to transmit by the UDP transmission mode of GPRS network or cdma network, the UDP transmission mode is fairly simple, its speed is faster than TCP, but UDP is a kind of unreliable transmission, needs to realize by agreement between navigation center and the car-mounted terminal reliable transmission of data.
The processing and the transmission method of guidance path in the aforementioned vehicle network type navigational system, wherein, car-mounted terminal is before vehicle arrives each key point during certain distance, navigation hint message code according to coordinate coupling in the message, from database, take out corresponding navigation hint information and play, so that vehicle is navigated.
By the above-mentioned description of this invention as can be known, because the present invention does not transfer to car-mounted terminal with complete navigation route information, and only be the coordinate and the corresponding navigation hint message code of each key point of transmission, and navigation hint information is to be stored in car-mounted terminal in advance, therefore need data quantity transmitted minimum, transmission time is short, thereby can guarantee the success of navigating.
Description of drawings
Fig. 1 is the navigation center of realization the inventive method and the system architecture synoptic diagram of car-mounted terminal;
Fig. 2 is the processing flow chart of navigation center in the inventive method;
Fig. 3 is the processing flow chart of car-mounted terminal in the inventive method;
Fig. 4 is the data structure diagram of message of the present invention;
Fig. 5 is the corresponding relation figure of navigation hint message code of the present invention and navigation hint information storage address;
Fig. 6 is the data structure diagram of reliable transport protocol link setup claim frame of the present invention;
Fig. 7 is the data structure diagram of reliable transport protocol link setup acknowledgement frame of the present invention;
Fig. 8 tears the data structure diagram of chain frame open for reliable transport protocol request of the present invention;
Fig. 9 tears the data structure diagram of chain acknowledgement frame open for reliable transport protocol of the present invention.
Specific embodiment
Below with reference to Fig. 1 to Fig. 9 specific embodiments of the invention are described.
Typical vehicle online type navigation system must possess a navigation center with electronic chart and electronic chart processing power, route computing power, and the car-mounted terminal that can receive gps data and can carry out wireless voice communication and wireless data communications and can navigate to vehicle according to the guidance path that receives from navigation center with navigation center.Its basic step comprises: 1) vehicle mounted guidance terminal sends vehicle position information by radio communication navigation center; 2) the seat personnel of navigation center and vehicle drive personnel determine the destination by interactive voice, and the seat personnel set up a navigation task by seat device, and during seat personnel on-hook, navigation center requires car-mounted terminal to send navigation requests automatically; 3) car-mounted terminal navigation center sends a navigation requests, this navigation requests comprises the up-to-date vehicle position information that vehicle mounted guidance terminal receives from gps satellite, navigation center calculates the best guidance path between destination and the up-to-date vehicle location automatically, and should send to vehicle mounted guidance terminal by the best guidance path; 4) vehicle mounted guidance terminal carries out navigation hint to vehicle according to this optimal path in the vehicle traveling process.Present embodiment focuses on how navigation center handles and transmits this best guidance path and how car-mounted terminal handles the guidance path that receives to car-mounted terminal.
With reference to Fig. 1, in the present embodiment, the equipment of realizing this method comprises navigation center 1 and car-mounted terminal 2, navigation center 1 comprises Figure 11, navigation route information extraction module 12, message coding module 13, wireless data communications module 14 electronically, and car-mounted terminal 2 comprises wireless data communications module 21, message decoder module 22, navigation hint information extraction modules 23, navigation hint information playing module 24 and navigation hint information database 20.
In navigation center 1, store among Figure 11 electronically with real road in crossing key point information one to one, each key point information comprises the coordinate and the direction information of this key point at least, the vehicle real-time position information that the coordinate of key point is used for receiving with car-mounted terminal 2 compares, determine playing the opportunity of navigation hint information, but whichaway turns round when direction information is represented vehicle through the crossing of this key point correspondence; The relevant information of each key point on the guidance path that navigation route information extraction module 12 is used for having calculated extracts from Figure 11 electronically; Message coding module 13 is mainly used in according to key point information and is each key point coupling navigation hint message code, and the coordinate and the navigation hint message code of each key point on the guidance path are formed one group of message; Wireless data communications module 14 is mainly used in this message is sent to car-mounted terminal 2, and in the present embodiment, wireless data communications module 14 adopts the GPRS module.
At car-mounted terminal 2, wireless data communications module 21 is used to receive the message from navigation center 1; Message decoder module 22 is used for the navigation hint message code of message is translated as the corresponding storage address of navigation hint information in navigation hint information database 20; Navigation hint information extraction modules 23 is used for extracting navigation hint information according to storage address from navigation hint information database 20; Navigation hint information playing module 24 is used to play navigation hint information, for vehicle carries out navigation hint.
With reference to Fig. 2, shown the processing procedure of 1 pair of guidance path of navigation center.At first, navigation route information extraction module 12 is from extracting navigation route information Figure 11 electronically, and this navigation route information comprises each key point information (step S1) on the guidance path; Then, message coding module 13 is according to each key point information, be respectively each key point coupling navigation hint message code (step S2), the navigation hint message code comprises information of voice prompt code and picture cues message code, each information of voice prompt code is corresponding to a brief voice suggestion statement, this voice suggestion statement has been described vehicle and how have been turned in this key point, and each picture cues message code is corresponding to an icon, and this icon has also been described in this correspondence key point and how to have been turned to; Then, message coding module 13 is formed one group of message (step S3) with the coordinate and the navigation hint message code of each key point on the guidance path, the data structure of this message as shown in Figure 4, this message has at first been described the quantity of the key point that has on the guidance path that sends, and has described the coordinate of each key point and information of voice prompt code, picture cues message code then successively one by one; At last, wireless data communications module 14 is sent to car-mounted terminal 2 (step S4) with wireless transmission method from navigation center 1 with this message.
With reference to Fig. 3, shown the processing procedure of 2 pairs of guidance paths of car-mounted terminal.At first, wireless data communications module 21 receives the message (step S5) from navigation center 1; 22 pairs of these messages of message decoder module decode (step S6), decode procedure is exactly that information of voice prompt code in the message and picture cues message code are translated as its storage address in navigation hint information database 20 according to predefined corresponding relation figure, and Fig. 5 has shown the corresponding relation of information of voice prompt code, picture cues message code and its storage address in navigation hint information database 20; Then, navigation hint information extraction modules 23 is in due course according to storage address and extracts information of voice prompt and picture cues information one by one from navigation hint information database 20, plays back on navigation hint information playing module 24 then (step S7 is to step S13).
Describe the processing procedure of navigation hint information extraction modules 23 below in detail.At first, first key point in the pointed message is set, notes, information of voice prompt code, the picture cues message code in the message all has been converted to corresponding storage address in navigation hint information database 20 (step S7) at this moment; Then, the coordinate and the mobile unit 2 of the key point that current pointer is pointed to compare (step S8) from the vehicle current position coordinates that gps satellite receives, judge whether the distance between this key point and the current vehicle location is less than or equal to a predetermined value (step S), for example 500 meters, if whether judged result, repeating step S8 then, if judged result is for being, then from navigation hint information database 20, extract corresponding information of voice prompt and picture cues information, and be sent to navigation hint information playing module 24 and play (step S10) according to storage address; Then, judge the key point (step S11) whether the vehicle latest position has been pointed to through current pointer, if not, then repeat to judge, if, the next key point (step S12) of pointed then is set, judge then whether current pointer has pointed to last key point inoperative position (step S13) afterwards, if not, then begin to carry out, just to navigation hint is carried out at next crossing, if the judged result of step S13 is for being from step S8, then explanation has been arrived the destination by the navigation vehicle, and navigation procedure finishes.
When above-mentioned navigation center 1 transmits message to car-mounted terminal 2, be that UDP communication mode by GPRS network or cdma network carries out, UDP communication mode speed is very fast, but UDP is a kind of unreliable transmission, thereby needs to realize by agreement between service centre 1 and the car-mounted terminal 2 reliable transmission of data.Transfer process is as follows particularly:
One, the link setup process:
The link setup process adopts 2 handshake mechanisms, consults window size simultaneously.Content by the initiator files a request and consults comprises window size, link life span, retransmit interval, and is final with being as the criterion that the take over party replys.At first, the initiator sends the link setup request, and concrete protocol frame content is sent request back wait acknowledge as shown in Figure 6, and time-out time is set simultaneously, retransmits 3 times, and three re-transmissions are not all received and replied, then expression failure.Wherein, traffic flag takies 1 byte, and window size takies 1 byte, and the link life span takies 2 bytes, and unit is minute, and retransmit interval takies 2 bytes, and unit is second; Secondly, after the take over party receives the link setup request,, mainly be window size according to actual conditions, send the link setup acknowledgement frame, concrete protocol contents does not retransmit as shown in Figure 7.
Two, data transmission:
When transmit leg will send data, acknowledgment number was filled in the smallest sequence number in the local reception window.Both sides are after link establishment, and sequence number is from 0 open numbering, and wherein link setup request sequence number is 0, and it is 0 that link setup is replied sequence number.The link setup requesting party if receive the Frame of this link, thinks that also link sets up under the state of waiting for the link setup request-reply, no longer send the link setup claim frame.
Three, tear chain open:
Tear chain process open and also adopt handshake mechanism 2 times, but fairly simple.The initiator of link but data are reliable send finish after, promptly send and tear the chain claim frame open, wait for that tearing chain open replys, this frame retransmits 1 time, 15 seconds at interval.No matter whether reply successfully, all can delete link.Request is torn the chain frame open as shown in Figure 8, tears the chain acknowledgement frame open as shown in Figure 9.
Use UDP to communicate, average transmission time can be controlled at 4 seconds, and vehicle can only be walked more than 100 meter at most in time of 4 seconds in navigation, can guarantee the promptness of guidance path transmission.
In addition, navigation center 1 transmits message to car-mounted terminal 2 also can adopt the TCP transmission mode, because TCP itself is exactly a reliable transmission, therefore need not is increasing transmission control, and TCP can ensure the arrival according to the order of sequence of data.
Above-mentioned only is a specific embodiment of the present invention, but design concept of the present invention is not limited thereto, and allly utilizes this design that the present invention is carried out the change of unsubstantiality, all should belong to the behavior of invading protection domain of the present invention.
Claims (6)
1, the processing of guidance path and transmission method in the vehicle online type navigation system comprise:
1) the crossing key point information one to one in storage and the real road in the electronic chart of navigation center;
2) extract navigation route information from electronic chart, this navigation route information comprises each key point information on the guidance path;
3) according to each key point information, be respectively each key point coupling navigation hint message code, the coordinate and the navigation hint message code of each key point on the guidance path are formed one group of message;
4) this message is sent to car-mounted terminal with wireless transmission method from navigation center;
5) car-mounted terminal extracts navigation hint information corresponding with each key point navigation hint message code and broadcast, so that vehicle is carried out navigation hint according to this message from the database that is pre-stored in car-mounted terminal.
2, the processing and the transmission method of guidance path in the vehicle online type navigation system as claimed in claim 1, wherein, described key point information comprises the coordinate and the direction information of this key point at least.
3, the processing and the transmission method of guidance path in the vehicle online type navigation system as claimed in claim 1, wherein, described navigation hint information comprises information of voice prompt and picture cues information.
4, the processing and the transmission method of guidance path in the vehicle online type navigation system as claimed in claim 1 wherein, adopt this message the TCP transmission mode of GPRS network or cdma network when navigation center is sent to car-mounted terminal.
5, the processing and the transmission method of guidance path in the vehicle online type navigation system as claimed in claim 1, wherein, when navigation center is sent to car-mounted terminal, adopt reliable transport protocol to transmit this message by the UDP transmission mode of GPRS network or cdma network.
6, the processing and the transmission method of guidance path in the vehicle online type navigation system as claimed in claim 1, wherein, car-mounted terminal is before vehicle arrives each key point during certain distance, navigation hint message code according to coordinate coupling in the message, from database, take out corresponding navigation hint information and play, so that vehicle is navigated.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101933309A (en) * | 2008-03-25 | 2010-12-29 | 朗讯科技公司 | Method and device for providing prompt information to users in communication system |
| CN102855768A (en) * | 2011-06-29 | 2013-01-02 | 比亚迪股份有限公司 | Vehicle-mounted voice information issuing method, vehicle-mounted voice information reading method, vehicle-mounted terminal and server |
| CN108340846A (en) * | 2018-02-02 | 2018-07-31 | 深圳市贝优通新能源技术开发有限公司 | A kind of onboard navigation system for new-energy automobile based on Internet of Things |
| CN109698718A (en) * | 2018-12-28 | 2019-04-30 | 中国电子科技集团公司第五十四研究所 | A kind of navigation path data sending method based on dipper system |
| CN113267189A (en) * | 2021-05-14 | 2021-08-17 | 杨皓淳 | Intelligent navigation system and method based on Internet of things and big data |
-
2005
- 2005-08-23 CN CN 200510044459 patent/CN1920482A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101933309A (en) * | 2008-03-25 | 2010-12-29 | 朗讯科技公司 | Method and device for providing prompt information to users in communication system |
| CN102855768A (en) * | 2011-06-29 | 2013-01-02 | 比亚迪股份有限公司 | Vehicle-mounted voice information issuing method, vehicle-mounted voice information reading method, vehicle-mounted terminal and server |
| CN108340846A (en) * | 2018-02-02 | 2018-07-31 | 深圳市贝优通新能源技术开发有限公司 | A kind of onboard navigation system for new-energy automobile based on Internet of Things |
| CN108340846B (en) * | 2018-02-02 | 2019-08-13 | 上海宏英智能科技有限公司 | A car navigation system for new energy vehicles based on the Internet of Things |
| CN109698718A (en) * | 2018-12-28 | 2019-04-30 | 中国电子科技集团公司第五十四研究所 | A kind of navigation path data sending method based on dipper system |
| CN113267189A (en) * | 2021-05-14 | 2021-08-17 | 杨皓淳 | Intelligent navigation system and method based on Internet of things and big data |
| CN113267189B (en) * | 2021-05-14 | 2022-05-03 | 杨皓淳 | Intelligent navigation system and method based on Internet of things and big data |
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Open date: 20070228 |