CN101202596B - Method and system for issuing traffic and trip information - Google Patents
Method and system for issuing traffic and trip information Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and a system for issuing TTI (Traffic and Travel Information). The TTI is first switched into TPEG flow, then the TPEG flow is switched into digitaltelevision transmission flow and finally the digital television transmission flow is issued by digital television ground transmission network. By adopting the method given by the embodiment of the invention, real time traffic and travel information issued to public travelers can be realized in a large territorial scope.
Description
Technical field
The present invention relates to the communications field, relate to the method and system of a kind of issuing traffic and trip information especially.
Background technology
TPEG (Transport Protocol Experts Group, transport protocol expert group) is the agreement that the EBU of European Broadcasting Union is formulated, can see through various digital medias, as: internet, digital broadcasting, Digital Television etc., issuing traffic and trip information (Traffic and Travel Information, TTI).TPEG is the research colony that European Broadcasting Union is devoted to develop the TTI host-host protocol simultaneously.This research colony set up in 1997, total over 60 families from consumption electronic product, electronic chart, service provide, the European Company and the tissue in field such as broadcasting participate and draw the TPEG agreement, no matter be information such as road traffic, public transport, weather conditions, all formulate within the category of standard, so that complete traffic and trip information to be provided at TPEG.The information of TPEG has language independent, transmits characteristics such as charge material is irrelevant, multimode application.
It is three layers (layer, sync, package layer, application layers) that the TPEG agreement is divided into, correspond to the OSI seven layer model the 3rd to layer 7.The TPEG ground floor is a layer, sync, corresponds to the network layer of OSI, handles the problem of Network Synchronization.The second layer is the package layer, correspond to OSI the 4th to layer 6, be responsible for the serial data of TPEG application layer is linked to be TPEG stream, TPEG stream can encrypted or compression.The 3rd layer is application layer, corresponds to the application layer of OSI.
Established before the TPEG application layer standard mesh have: service and the network information (Service andNetwork Information, SNI), Traffic Information (Road Traffic Message, RTM) and public traffic information (Public Transport Information, PTI); TPEG-PTI, TPEG-SNI provide every information of relevant ISP, and the information of service content, and TPEG-RTM provides the message of relevant road traffic, as: traffic events, traffic jam etc.; TPEG-PTI then provides the relevant information of public transport, as: order of classes or grades at school information, order of classes or grades at school delay information etc.TPEG-RTM and TPEG-PTI share TPEG-LOC (Location) agreement that is used for describing geography information.Also have some application layer protocols of formulating in addition, as: meteorological information (TPEG-Weather, TPEG-WEA), parking information (TPEG-Parking Information, TPEG-PKI) etc.
(International Telephone Union is an international organization coordinating telecommunications affairs aspect between the Telecommunications Administration of countries in the world government ITU), is found on May 17th, 1865 in International Telecommunications Union.ITU has three departments now: telecommunication standard department (TSS, i.e. ITU-T), radio communication department (RS, i.e. ITU-R) and telecommunications development department (TDS, i.e. ITU-D).Wherein the ITU-T work taken up comprises: business provides, the operation of network and performance; The rate and the settlement principle that comprise related telecommunications economy and policy issue; Telecommunication administration comprises TMN; Protection at the electromagnetic environment influence; To external equipment and relevant outdoor mounted; Comprehensive broadband cable network and TV and transfer voice; Signaling request and agreement; Performance and service (business) quality; Next generation network (framework, evolution and fusion); The structure of optical fiber and other transmission networks; Multimedia terminal, business and application; Safety, language and telesoftware; Mobile communications network.
In recent years, digital broadcasting terrestrial transmission technology is ripe gradually, and the terrestrial DTV transmission standard that various countries' standard has been determined has DVB-T, the ATSC of the U.S., the ISDB-T of Japan, the DTMB (Digital Terrestrial Multimedia Broadcast) of China in Europe.
Digital Television is to utilize digital technology, the data that view data after the compression and program is relevant generate digital television transfer TS (Transport Stream) stream according to the form of standard, send after ovennodulation then, receiving terminal is reduced into the tv broadcasting technology of picture rich in detail and related data by demodulation, decoding.Digital television program specific information (PSI) and business information (SI) mainly comprise Program Association Table PAT (Program Association Table), Program Map Table PMT (Program Map Table), CAT Conditional Access Table CAT (Conditional Access Table), Event Information Table EIT (Event InformationTable), SDT Service Description Table SDT (Service Description Table) etc., wherein, pat table provides a program number (program_number) and comprises the PID (ProgramIdentification Data) of the transmission stream packets of this program definition; Pmt table provides program numbers and forms mapping between the source code flow between them; The CAT table provides at one or more CA systems and Entitlement Management Message thereof; The EIT table provides the information of the program segment that comprises in each program business in chronological order; The SDT table is described the business in the specific transport stream that is contained in.
Moving Picture Experts Group-2 is " the universal coding standard of motion video and sound accompaniment thereof ".Wherein ISO/IEC 13818-1 is a components of system as directed, is mainly used to define the combination of video, audio frequency and other data, and synthetic one or more of these data sets is suitable for the elementary stream storing or transmit.Rec H220 is one of the international standard of the appointment of ITU-T: Recommendations H.220.The content of this standard is identical with the content of ISO/IEC 13818-1.Be the different number systems of two organization internals.
At present, be the main force that the individuality trip user of representative is developed into urban transportation gradually with private car and taxi, to compare with public transport, individual consumer's trip has more various trip requirements and optimized trip Path selection.Simultaneously, the rise of tourist industry has also usually brought huge tourist communications pressure to the city in festivals or holidays.
At present the demand that exists aspect the trip information service in the traffic towards popular traveler comprises: wide area, big capacity, information is issued effective way cheaply; Provide transport information to realize in modes such as literal, voice towards the dynamic navigation of popular traveler and traffic guidance timely; The operating specification method is described and is transmitted dynamic traffic and trip information.
Real-time Traffic Information, for example the real-time traffic flow of road, by the one-way road of temporary changes and the crossing information such as position of permission, emergency generation of communicate by letter of turning, broadcast to all popular travelers or vehicle driver by wireless communication means, and, be the basis of realizing following automobile navigation and traffic guidance by vehicle-mounted or subscriber equipment identification selection reception.
At present, automobile navigation develops the basic two kinds of patterns of dividing aspect radio communication:
1, GPS (Global Position System, global positioning system) and general communication system, GPS and trunked communication system combination.This mode belongs to the private network mode, is early stage communication pattern, generally can only realize Speech Communication (analog signal), this mode does not need special communication cost, but the investment height of networking and maintenance, coverage is little, poor transmission is not suitable for popularizing to masses.
2, GPS and GSM (Global System for Mobile Communications, global system for mobile communications) or GPRS (General Packet Radio Service, GPRS) or the combination of CDMA (Code Division Multiple Access, code division multiple access), GPS and satellite network communication system.This mode belongs to the public network mode, is the communication pattern that adopted in recent years.The communication link complexity of satellite network wherein, cost of investment height, product are difficult to popularize to masses.GSM numeral public mobile network has wide coverage, networked capabilities is strong, support the two-way short message service of point-to-point, therefore be subjected to many users' favor, but it is to utilize the Short Message Service function to realize the GPS message transmission, and Short Message Service is not set up signaling paths end to end, and it is that the mode that relies on the storage forwarding transmits information, therefore can not provide real-time message transmission capability.GPRS/CDMA 1X provides wireless end to end IP to connect.Compare with short message mode, GPRS/CDMA 1X can more effectively utilize the radio network information resource, is particularly suitable for sudden, frequent low discharge transfer of data.But, owing to be subjected to the base station capacity limit, can not transmit Real-time Traffic Information to most users simultaneously based on the communication of the ICP/IP protocol of GPRS/CDMA 1X net.
Present traffic guidance mode mainly comprises:
1, the traffic guidance screen is set near road.By position and the size and the enough big display text of suitable selection traffic guidance screen, the driver can be clear that the information that the traffic guidance screen shows in advancing.But, the real-time traffic situation of road, shielded and induced a lot of limitations by turn communicate by letter information such as position use traffic guidance that permission, emergency take place of the one-way road of temporary changes and crossing for the automobile of running at high speed.On the one hand, the amount of information of traffic guidance screen demonstration is very limited; On the other hand, traffic guidance screen generally only shows near the transport information in highway section its, if congested in traffic, the driver only enter this highway section just know taken place crowded, can not be in time by selecting other routes to avoid the highway section that these crowd.As seen, use the traffic guidance screen just to realize the one side means of traffic guidance, the popular abundanter traffic guidance mode of information that still needs.
2, utilize the navigation system on the vehicle to carry out traffic guidance.Conventional vehicle navigation system can be based on receiving gps satellite signal, and navigate and induce in conjunction with the traffic map database of the static state of self storage.This mode can be known and show the geographical position of vehicle exactly, and can show the garage position on the way and carry out the navigation speech prompting according to starting point and destination programme path before trip.The limitation of this traffic guidance mode is: the upgrading of urban infrastructure construction is more and more faster, and the map data update that is used to navigate is slower, is not inconsistent with the real road layout sometimes; Be not easy to maybe can't receive the signal outside the gps satellite signal,, also just can't share the Real-time Traffic Information that comes from broadcasting and TV as broadcasting or TV signal; Because traffic is dynamic change, and gps satellite signal only provides the geographical position, the navigation system map data stored also is static, so can't draw the real-time traffic situation, the flexibility and the reasonability of traffic guidance are relatively poor.For popular traveler or the driver provides in real time, effectively information is induced, be that following Vehicular navigation system realizes that traffic guidance is necessary.
In sum, in the prior art, the circulation way amount of information of traffic and trip information TTI is little, real-time is not enough, towards user scope and territorial scope limited.
Summary of the invention
In view of this, the embodiment of the invention provides the method and system of a kind of issuing traffic and trip information, can solve in the prior art traffic and trip information circulation way amount of information is little, real-time is not enough, towards user scope and the limited problem of territorial scope.
A kind of issuing traffic that the embodiment of the invention provides and the method for trip information comprise:
Convert traffic and trip information to transport protocol expert group TPEG stream;
Change the TPEG circulation into digital TV transmission stream;
Digital TV transmission stream is utilized the issue of digital TV ground transmission network;
After terminal equipment received described digital TV transmission stream, described method further comprised:
Described digital TV transmission stream is converted to TPEG stream from this TPEG stream, parses traffic and trip information then;
According to traffic and the trip information that parsing obtains, the logical topology figure that foundation can be described trip area road traffic comprises step:
1) initialization topological diagram G={V, E}, V=null, E=null, promptly vertex set and limit collection all are empty;
2) from physics mileage chart layer, take out article one road P;
3) calculate the intersection point of this road P and all remaining roads, these intersection points all will be as the summit of logical topology figure.If intersection point is not in V set then intersection point is added V;
4) n all intersection points have been divided into n+1 segment with this road, calculate the length of each segment, and these segments all will be as the limit of logical topology figure, and the weight on every limit is exactly each segment length separately, if the limit is not in E set then the limit is joined E;
5) take out next bar road P of physics road, if P=null then finish, otherwise repeat 3);
Utilize the related information between the node adjacency matrix measuring point of described topological diagram, then with between internodal 2 of two among this logical topology figure directly the phase access path and by other found and the node transfer path of the optimal path of initial point between the shorter one present to the user as guidance path by described terminal equipment.
A kind of issuing traffic that the embodiment of the invention provides and the system of trip information comprise:
The TPEG coding module is used for converting traffic and trip information to TPEG stream,
The TPEG/TS modular converter is used for the TPEG circulation is changed into digital TV transmission stream and uploads to described digital TV ground transmission network;
The digital TV ground transmission network is used to issue the described system of digital TV transmission stream and further comprises:
The TS/TPEG modular converter is used for digital television signal is converted to TPEG stream;
Parsing module is used for discerning and parse traffic and trip information from TPEG stream;
Database module is used for the storing electronic map data and preserves the data that come from parsing module; According to traffic and the trip information that parsing obtains, the logical topology figure that foundation can be described trip area road traffic, and be further used for:
1) initialization topological diagram G={V, E}, V=null, E=null, promptly vertex set and limit collection all are empty;
2) from physics mileage chart layer, take out article one road P;
3) calculate the intersection point of this road P and all remaining roads, these intersection points all will be as the summit of logical topology figure.If intersection point is not in V set then intersection point is added V;
4) n all intersection points have been divided into n+1 segment with this road, calculate the length of each segment, and these segments all will be as the limit of logical topology figure, and the weight on every limit is exactly each segment length separately, if the limit is not in E set then the limit is joined E;
5) take out next bar road P of physics road, if P=null then finish, otherwise repeat 3);
Utilize the related information between the node adjacency matrix measuring point of described topological diagram, then with between internodal 2 of two among this logical topology figure directly the phase access path and by other found and the node transfer path of the optimal path of initial point between the shorter one as guidance path;
The video output module is used to export described guidance path.
Description of drawings
Fig. 1 is the method schematic diagram of issuing traffic and trip information;
Fig. 2 is the system schematic of issuing traffic and trip information;
Fig. 3 is the method schematic diagram that utilizes GPS and traffic and trip information navigation;
Fig. 4 is navigation terminal system path planning schematic diagram;
Fig. 5 plans schematic diagram again for path after traffic accident takes place;
Traffic accident path planning schematic diagram afterwards for taking place in Fig. 6 once more;
Fig. 7 is a system schematic of utilizing GPS and traffic and trip information navigation;
The method schematic diagram of Fig. 8 for issuing and receive traffic and trip information and traveler being navigated;
The system schematic of Fig. 9 for issuing and receive traffic and trip information and traveler being navigated.
Embodiment
In embodiments of the present invention, will contain the digital TV transmission stream of traffic and trip information by the digital TV ground transmission Web broadcast; The navigation terminal side receives the digital TV transmission stream that contains traffic and trip information by the digital TV ground transmission network, and navigates according to described traffic and trip information.The embodiment of the invention can solve that circulation way for traffic and trip information exists that amount of information is little, real-time not enough and towards user scope and the limited problem of territorial scope.
As shown in Figure 1, the issuing traffic of the embodiment of the invention and the method for trip information convert traffic and trip information to digital television transfer TS stream earlier, are uploaded to the digital TV ground transmission network again, utilize the digital TV ground transmission network to issue, specifically comprise the steps:
Step 101: collect and preserve traffic and trip information TTI;
Step 102: convert traffic and trip information TTI to transport protocol expert group TPEG stream;
Step 103: change the TPEG circulation into digital TV transmission stream;
Step 104: digital TV transmission stream is utilized the issue of digital TV ground transmission network.
Use this method traffic and trip information can be inserted digital TV ground transmission network and propagation, be elaborated below.
In step 101, adopt the TPEG protocol architecture to come organization and management traffic and trip information.The application of themes of traffic in the TPEG protocol architecture and trip information comprises service and the network information (SNI), Traffic Information (RTM), public traffic information (PTI), geography information (LOC) at present, these information are provided by TTI publisher, have enough big amount of information and real-time, the recipient can use self-defining file format to preserve by the application of themes classification.
In step 102 and 103, press the regulation of TPEG agreement, before converting TPEG stream to, the content in traffic and the every application of themes of trip information must be described with the XML Shema of XML formal definition.For instance, belong to Traffic Information RTM application event for one, the RTMXML Shema file that obtains after the description is as follows:
<tpeg_message>
<originator?country＝″China″originator_name＝″Ding?Jian，Tsinghua?University″/>
<summary?xml:lang＝″en″>Tpeg?Sample?file</summary>
<road_traffic_message?message_id＝″1057″version_number＝″1″
message_generation_time＝″2007-05-10T06:23:57+1″
start_time＝″2007-05-10T06:13:45+1″severity_factor＝″&rtm31_3；″>
<location_contaiher?language＝′&loc41_30；′>
<location_coordinates?location_type＝′&loc1_3；′>
<WGS84?latitude＝′116.326968′longitude＝′39.995725′/>
<descriptor?descriptor_type＝′&loc3_7；′descriptor＝′A420′/>
<descriptor?descriptor_type＝′&loc3_24；′descriptor＝′thu′/>
<descriptor?descriptor_type＝′&loc3_25；′descriptor＝′Beijing′/>
<WGS84?latitude＝′116.326583′longitude＝′39.995072′/>
<descriptor?descriptor_type＝′&loc3_7；′descriptor＝′A420′/>
<descriptor?descriptor_type＝′&loc3_24；′descriptor＝′pku′/>
<descriptor?descriptor_type＝′&loc3_25；′descriptor＝′Beijing′/>
<direction_type?direction_type＝′&loc2_2；′/>
</location_coordinates>
</location_container>
<obstructions?number_of＝″1″>
<position?position＝″&rtm10_37；″/>
<vehicles?number_of＝″1″>
<position?position＝″&rtm10_37；″/>
<vehicle_problem?vehicle_problem＝″&rtm3_1；″/>
</vehicles>
</obstructions>
<network_conditions>
<restriction?restriction＝″&rtm49_11；″/>
</network_conditions>
</road_traffic_message>
</tpeg_message>
This RTM XML Shema file description locate the accident that respectively has a vehicle and barrier to bump against in longitude and latitude coordinate (116.326968,39.995725) and (116.326583,39.995072).Used some rtm and loc variable to come situation etc. to be elaborated in the file to the generation of accident.
For the XML Shema file that writes, be encoded into TPEG stream according to the regulation of TPEG agreement, promptly at first to the RTM XML Shema file of input through the RTM resolver resolves after, obtain a RTM List object; This RTM List object will be stored in the TPEG component frame and further be packaged into the TPEG transmission frame then; At last the TPEG transmission frame is carried out binary coding and obtain TPEG stream.
Next TPEG stream is standardized according to the form of digital television program signal and be encoded into the transmission frame that meets ITU-T Rec H220, ISO/IEC 13818-1 standard.
The TPEG transmission frame is carried out normalized process according to the form of digital television program signal to carry out as follows:
(1), encapsulation: the TTI conduct that will be encoded into TPEG stream is encapsulated in the event descriptor, and finishes filling in other guide in the event descriptor according to the requirement of event descriptor in the SI standard.
(2), describe: the service field in the event descriptor is set to identical sign with service field in the SDT Service Description Table, and finish filling in to other guide in the SDT Service Description Table according to the requirement of SDT Service Description Table in the business information standard, the TTI that is transmitted is described as a special business, as the selective use of channel index information.
(3), mapping: the service field in the SDT Service Description Table is set to identical sign with program number field in the Program Map Table, and finish filling in to other guide in the Program Map Table according to the requirement of Program Map Table in the business information standard, Real-time Traffic Information as an independent program, and is distributed program number.
(4), association: the program number field in the Program Map Table is joined in the Program Association Table, and distribute the program difference sign indicating number of transmission stream packets for this program number.
So far, TPEG stream encapsulates according to the form of digital television program signal, according to ITU-T Rec H220, ISO/IEC 13818-1 standard event descriptor, SDT Service Description Table, Program Map Table, Program Association Table are encoded then, obtain digital TV transmission stream.
In step 104, utilize the issue of digital TV ground transmission network to meet the transport stream of ITU-T Rec H220, ISO/IEC 13818-1 standard.Can receive the following information that is similar on the digital television receiver, these information are exactly the TPEG stream that carries in the event descriptor, and size is 1024 bytes:
EPG?Data[0]＝4e00 EPG?Data[1]＝b000 EPG?Data[2]＝2f00 EPG?Data[3]＝100
EPG?Data[4]＝2d00 EPG?Data[5]＝c000 EPG?Data[6]＝00 EPG?Data[7]＝00
EPG?Data[8]＝00 EPG?Data[9]＝6b00 EPG?Data[10]＝00 EPG?Data[11]＝00
EPG?Data[12]＝00
……
Data[1022]＝3c00 EPG?Data[1023]＝00
Enforcement through step 102～104, can be implemented in big territorial scope and provide real-time traffic and trip information not changing existing digital TV ground transmission network and Digital Television head end transmitter and apparatus of digital television receiving, do not take the private radio frequency spectrum resource separately, need not building under the situation of new wireless coverage network to popular traveler.
The embodiment of the invention provides a kind of system with traffic and trip information access digital terrestrial transmissions network, as shown in Figure 2.This system adopts the TPEG protocol architecture to come organization and management traffic and trip information.Traffic and trip information being inserted the digital terrestrial transmissions network, be meant traffic and trip information are uploaded to the digital TV ground transmission network, is that the digital TV transmission stream that will comprise traffic and trip information sends the DTMB multiplexing equipment to specifically.Traffic and trip information service access system 202 comprise as lower module:
TTI information adaptation module 203, and the form with TCP/IP is connected between traffic and the trip information TTI ISP 201, be used to monitor and receive the traffic and the trip information of TTI ISP 201 issues, and filter out unwanted information, Useful Information is passed to sort module 204;
Parsing module 206, be used for reading TTI sort module 204 sorted traffic and trip informations from TTI information bank module 205, again respectively with the XML Shema of the XML formal definition description that standardizes, at different traffic and trip information application of themes, the different XML Shema of these application of themes of definition correspondence respectively also generates the XML file, deposits database table corresponding in the TTI/XML database module 207 in;
TTI information bank module 205 is used to deposit the data that sort module deposits in;
TTI/XML database module 207 is used to deposit the data that parsing module deposits in;
TPEG/TS modular converter 211, be used for reading TPEG stream and being assembled into PAT, PMT, SDT, the EIT from TPEG database module 210, according to the requirement of ITU-T Rec H220, ISO/IEC 13818-1 standard PAT, PMT, SDT, EIT are encoded, the digital TV transmission stream that obtains standard sends DTMB multiplexing equipment 217 then to again;
TPEG/TS modular converter 211 comprises package module 212, describing module 213, mapping block 214, relating module 215, coding module 216, wherein:
Describing module 213, be used for the service_id field of EIT and be set to identical sign with service number (service_id) field among the SDT Service Description Table SDT (ServiceDescription Table), and finish filling in to other guide among the SDT according to the requirement of SDT, the TTI that is transmitted is described as a special business, as the selective use of channel index information;
Relating module 215, be used for program number (program_number) field of PMT is joined among the Program Association Table PAT (Program Association Table), and distribute the program difference sign indicating number (Program Identification Data) of transmission stream packets for the program number of traffic and trip information;
After the digital television signal of standard enters DTMB multiplexing equipment 217, the digital television signal transport stream that comprises traffic and trip information can further be handled and emission by existing digital TV ground transmission network, thereby is received by existing apparatus of digital television receiving.
Traffic and trip information are inserted the system of digital terrestrial transmissions network and the system that the digital TV ground transmission network has constituted issuing traffic and trip information, this system can not change existing digital TV ground transmission network and Digital Television head end transmitter and apparatus of digital television receiving, not take the private radio frequency spectrum resource separately, need not build under the situation of new wireless coverage network, realizes issuing towards popular traveler, vehicle driver's real-time traffic and trip information at big territorial scope.
The embodiment of the invention provides a kind ofly to be utilized the global position system GPS signal and is included in the method that traffic and trip information in the digital television signal navigate, by analyzing Digital Television and gps signal, real-time traffic and trip information are carried out image demonstration or voice broadcast to the driver.As shown in Figure 3, the method that provides of the embodiment of the invention specifically may further comprise the steps:
Step 301: receive gps signal and digital television signal at the navigation user side joint;
Step 302: digital television signal is converted to TPEG stream;
Step 303: from TPEG stream, resolve traffic and trip information TTI and storage;
Step 304: according to traffic and the trip information TTI of storage and combine information in the gps signal, export navigation picture and navigation speech.
In step 301, use existing digital television receiving apparatus and the GPS receiving system can receiving digital television signal and gps signal.
In step 302, the DTMB demodulation module in the digital television receiving apparatus carries out demodulation with the OCTV radiofrequency signal, and output MPEG-2 TS stream carries out the MPEG-2 decoding again to MPEG-2 TS stream, and MPEG-2 TS circulation is turned to TPEG stream.
In step 303, TPEG stream is carried out the TPEG decoding, at first can decode during the TPEG decoding to the binary message of TPEG stream, because the smallest transmission unit of TPEG stream is a transmission frame, therefore at first need to identify flag bit " FFOF " synchronization character of transmission frame, and then the transmission frame that recognizes further decoded parse RTM, PTI, SNI, the LOC information that wherein comprises, then RTM, PTI, SNI, the LOC information that parses is saved in the database.
In step 304, according to the information in the gps signal, RTM in the database, PTI, SNI, LOC information is managed efficiently electronic map data and is organized, carry out various spatial information retrievals and spatial analysis, road information to the zone of going on a journey, building information, intersection informations etc. carry out real time modifying, and in conjunction with longitude about vehicle by gps signal drew, latitude, height above sea level, speed, information such as time, use path navigation algorithmic rule path, TTI is directly reflected into navigation with on the electronic chart, present to popular traveler or vehicle driver by the liquid crystal display screen of suitable size simultaneously, use loud speaker that TTI is carried out voice broadcast, thereby carry out the dynamic navigation task that comprises real-time traffic and trip information.The path navigation algorithm is carried out in this step, is divided into for 2 steps:
The 1st step: all roads and node are carried out preliminary treatment, the road traffic logical topology figure that foundation can be described trip area road traffic, the algorithm of logical topology map analysis is exemplified below:
1) initialization topological diagram G={V, E}, V=null, E=null, promptly vertex set and limit collection all are empty;
2) from physics mileage chart layer, take out article one road P;
3) calculate the intersection point of this road P and all remaining roads, that is to say all intersections on the road P, these intersection points all will be as the summit of logical topology figure.If intersection point is not in V set then intersection point is added V;
4) n all intersection points have been divided into n+1 segment with this road, calculate the length of each segment, and these segments all will be as the limit of logical topology figure, and the weight on every limit is exactly each segment length separately, if the limit is not in E set then the limit is joined E;
5) take out next bar road P of physics road, if P=null then finish, otherwise repeat 3)
Finished after the foundation of logical topology road, just can realize Shortest Path Searching to road, method is: the network on the various practical significances is conceptualized as the oriented or non-directed graph in the graph theory, utilize the related information between the node adjacency matrix measuring point of figure, think simultaneously two internodal shortest paths be between 2 directly the phase access path and by other found and the node transfer path of the optimal path of initial point between the shorter one.
Path planning is given an example as Fig. 4, Fig. 5 and shown in Figure 6 with demonstration, and Fig. 4 has described the path planning before not receiving traffic accident, as shown in phantom in FIG..When the A point is neighbouring in reaching figure, received that traffic accident message takes place in the place ahead, navigation system restarts the path specification algorithm, plans again that according to the position of current vehicle the traffic route that makes new advances is to avoid the scene of a traffic accident in the place ahead, shown in the dotted line among Fig. 5.If traffic accident takes place again on new traffic route, then navigation system restarts path planning according to the vehicle current location once more, produces new traffic route, shown in the dotted line among Fig. 6.
The method of using the embodiment of the invention to provide is navigated and is induced the numerical map of use can the real time dynamic tracing urban road and the dynamic change of traffic, realizes real-time route planning.
The embodiment of the invention provides a kind of terminal installation that utilizes the global position system GPS signal and be included in the TTI navigation in the digital television signal.By receiving and analyze Digital Television and gps signal, real-time TTI information is carried out image to the driver show or voice broadcast.As shown in Figure 7, the device that provides of the embodiment of the invention comprises with lower module:
Gps signal receiver module 711 is used to receive gps signal, obtains position, direction and the speed data about vehicle and is passed to parsing module 704;
Digital television signal receiver module 702 is used to receive the digital television transfer TS stream that comes from the digital TV ground transmission network, and carries out demodulation with DTMB demodulation module 701, output MPEG-2TS stream;
TS/TPEG modular converter 703 is used for digital television signal is converted to the TPEG stream that meets the TPEG agreement;
Parsing module 704 is used for flowing the data of discerning and parsing various TTI application of themes correspondences from TPEG, and analyzes in conjunction with the data that gps signal receiver module 711 transmits, and result data is passed to database module 705;
Figure layer modular converter 707 is used for from database module 705 extraction data and converts image data stream to being sent to the video output module again;
Audio frequency output module 710 is used for the navigation speech that output packet contains the TTI content.
The digital television signal receiver module uses serial port to be connected with the TS/TPEG modular converter.Parsing module 704 is from the identification of TPEG stream and parse the various traffic data corresponding with the trip information application of themes, and analyzes in conjunction with the data in the gps signal, forms real-time traffic and trip information.705 pairs of electronic map datas of database module are managed efficiently and are organized, and provide real-time traffic and trip information in conjunction with parsing module 704, carry out various spatial information retrievals and spatial analysis, regional road information, building information, intersection information etc. carry out real time modifying to going on a journey, and, use path navigation algorithmic rule path in conjunction with by information such as longitude that gps signal drew, latitude, height above sea level, speed, times about vehicle.
Figure layer modular converter 707 and audio conversion module 708 are according to the data through organization and management in the database module 705, data that extraction and current traffic condition or popular traveler need be relevant selectively, video output module and audio frequency output module just can provide real-time traffic and trip information to popular traveler thus.
The device that uses the embodiment of the invention to provide navigates and induces the numerical map of use can the real time dynamic tracing urban road and the dynamic change of traffic, realizes real-time route planning.
The method that the embodiment of the invention provides a kind of issue and receives traffic and trip information TTI and popular traveler is navigated, as shown in Figure 8, this method comprises the steps:
Step 801: TTI is inserted the digital TV ground transmission network;
Step 802: issue contains the digital TV transmission stream of TTI;
Step 803: according to the digital TV transmission stream that contains TTI that receives, the output navigation information.
The detailed step of said method is as shown in Figure 9:
Step 901: collect and preserve traffic and trip information TTI;
Step 902: convert traffic and trip information TTI to transport protocol expert group TPEG stream;
Step 903: change the TPEG circulation into digital TV transmission stream;
Step 904: digital TV transmission stream is utilized the issue of digital TV ground transmission network;
Step 905: receive gps signal and digital television signal at the navigation user side joint;
Step 906: digital television signal is converted to TPEG stream;
Step 907: from TPEG stream, parse traffic and trip information TTI and storage;
Step 908: according to traffic and the trip information TTI of storage and combine information in the gps signal, export navigation picture and navigation speech.
Step 902 and 903 combinations, thus be to convert traffic and trip information to digital TV transmission stream access digital TV ground transmission network.Step 902 adopts the TPEG protocol architecture to come organization and management traffic and trip information, has to contain much information and real-time characteristics.Step 904 is to have utilized the relevant apparatus of existing terrestrial transmission Digital Television emission system, need not build new wireless communication networks.Step 905-908 is according to the digital TV transmission stream that contains traffic and trip information that receives, the output navigation information.Step 906 and 907 obtains TPEG stream respectively and it is handled.The navigation information of output has comprised navigation picture and navigation speech.
Use database storage predetermined traffic and trip information and electronic map data in the said method, also receive the data that deposit in, and data are managed, thereby selectively to popular traveler output information needed.
The method of using the embodiment of the invention to provide can not change existing digital TV ground transmission network and Digital Television head end transmitter and apparatus of digital television receiving, not take the private radio frequency spectrum resource separately, need not build under the situation of new wireless coverage network, realize providing real-time traffic and trip information at big territorial scope, realize real-time route planning towards popular traveler.
A kind of system that provides traffic and trip information TTI also to navigate to popular traveler is provided the embodiment of the invention, and by shown in Figure 9, it is made up of three parts:
1, the TTI service access system 1001;
2, the terrestrial transmission digital television transmission 1002;
3, the navigation terminal device 1003.
TTI service access system 1001 will come from TTI supplier 1004 information by a series of conversions, obtain digital television signal TS and flow the DTMB multiplexing equipment 1005 that is linked into then in the digital TV ground transmission network 1002, thereby be sent to the issue that DTMB modulator 1006 is realized TTI then.Digital television signal is received TS stream by the digital television signal receiver module in the navigation terminal system 1,003 1007, DTMB demodulator 1008 in the digital television signal receiver module 1007 obtains MPEG-2TS stream with the decoding of TS stream, next be converted to TPEG stream by TS/TPEG modular converter 1009, pass through again after a series of processing, obtain each application of themes such as the RTM of TTI, PTI, SNI, the content of LOC, pictorial information is by 1010 outputs of video output module, for example use LCD screen to show, voice messaging for example uses loud speaker to report by 1011 outputs of audio frequency output module.Like this, traveler 1012 can access in real time, dynamic traffic and trip information.
The system that the embodiment of the invention provides can not change existing digital TV ground transmission network and Digital Television head end transmitter and apparatus of digital television receiving, not take the private radio frequency spectrum resource separately, need not build under the situation of new wireless coverage network, realize providing real-time traffic and trip information at big territorial scope, realize real-time route planning towards popular traveler.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. the method for issuing traffic and trip information is characterized in that, comprises the steps:
Convert traffic and trip information to transport protocol expert group TPEG stream;
Change the TPEG circulation into digital TV transmission stream;
Digital TV transmission stream is utilized the issue of digital TV ground transmission network;
After terminal equipment received described digital TV transmission stream, described method further comprised:
Described digital TV transmission stream is converted to TPEG stream from this TPEG stream, parses traffic and trip information then;
According to traffic and the trip information that parsing obtains, the logical topology figure that foundation can be described trip area road traffic comprises step:
1) initialization topological diagram G={V, E}, V=null, E=null, promptly vertex set and limit collection all are empty;
2) from physics mileage chart layer, take out article one road P;
3) calculate the intersection point of this road P and all remaining roads, these intersection points all will be as the summit of logical topology figure.If intersection point is not in V set then intersection point is added V;
4) n all intersection points have been divided into n+1 segment with this road, calculate the length of each segment, and these segments all will be as the limit of logical topology figure, and the weight on every limit is exactly each segment length separately, if the limit is not in E set then the limit is joined E;
5) take out next bar road P of physics road, if P=null then finish, otherwise repeat 3);
Utilize the related information between the node adjacency matrix measuring point of described topological diagram, then with between internodal 2 of two among this logical topology figure directly the phase access path and by other found and the node transfer path of the optimal path of initial point between the shorter one present to the user as guidance path by described terminal equipment.
2. the method for claim 1 is characterized in that, described TPEG is circulated changes digital TV transmission stream into, comprising:
Described TPEG stream is encapsulated in the descriptor of Event Information Table;
Service field in the Event Information Table is set to identical sign with service field in the SDT Service Description Table;
Service field in the SDT Service Description Table is set to identical sign with program number field in the Program Map Table;
Program number field in the Program Map Table is joined in the Program Association Table;
Event Information Table, SDT Service Description Table, Program Map Table, Program Association Table are encoded into described digital TV transmission stream.
3. method as claimed in claim 2, it is characterized in that, by ITU-T RecH220, ISO/IEC 13818-1 standard described Event Information Table, SDT Service Description Table, Program Map Table, Program Association Table are encoded into described digital TV transmission stream in the described step that Event Information Table, SDT Service Description Table, Program Map Table, Program Association Table is encoded into digital TV transmission stream.
4. the system of issuing traffic and trip information is characterized in that, comprises digital TV ground transmission network and traffic and trip information connecting system, and, described traffic and trip information connecting system comprise TPEG coding module and TPEG/TS modular converter, wherein
Described TPEG coding module is used for converting traffic and trip information to TPEG stream,
Described TPEG/TS modular converter is used for the TPEG circulation is changed into digital TV transmission stream and uploads to described digital TV ground transmission network;
Described digital TV ground transmission network is used to issue described digital TV transmission stream;
Described system further comprises:
The TS/TPEG modular converter is used for digital television signal is converted to TPEG stream;
Parsing module is used for discerning and parse traffic and trip information from TPEG stream;
Database module is used for the storing electronic map data and preserves the data that come from parsing module; According to traffic and the trip information that parsing obtains, the logical topology figure that foundation can be described trip area road traffic, and be further used for:
1) initialization topological diagram G={V, E}, V=null, E=null, promptly vertex set and limit collection all are empty;
2) from physics mileage chart layer, take out article one road P;
3) calculate the intersection point of this road P and all remaining roads, these intersection points all will be as the summit of logical topology figure.If intersection point is not in V set then intersection point is added V;
4) n all intersection points have been divided into n+1 segment with this road, calculate the length of each segment, and these segments all will be as the limit of logical topology figure, and the weight on every limit is exactly each segment length separately, if the limit is not in E set then the limit is joined E;
5) take out next bar road P of physics road, if P=null then finish, otherwise repeat 3);
Utilize the related information between the node adjacency matrix measuring point of described topological diagram, then with between internodal 2 of two among this logical topology figure directly the phase access path and by other found and the node transfer path of the optimal path of initial point between the shorter one as guidance path;
The video output module is used to export described guidance path.
5. system as claimed in claim 4 is characterized in that, described TPEG/TS modular converter comprises package module, describing module, mapping block, relating module, coding module, wherein,
Described package module is used for described TPEG stream is encapsulated in the descriptor of Event Information Table;
Described describing module is used for the service field of Event Information Table and is set to identical sign with field in the SDT Service Description Table;
Described mapping block is used for the service field of SDT Service Description Table and is set to identical sign with program number field in the Program Map Table;
Described relating module is used for the program number field of Program Map Table is joined in the Program Association Table;
Described coding module is used for Event Information Table, SDT Service Description Table, Program Map Table, Program Association Table being encoded into digital TV transmission stream and inserting described digital TV ground transmission network.
6. system as claimed in claim 5, it is characterized in that described coding module is encoded into described digital TV transmission stream by ITU-T RecH220, ISO/IEC 13818-1 standard with described Event Information Table, SDT Service Description Table, Program Map Table, Program Association Table.
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| CN104268415B (en) * | 2014-09-30 | 2017-03-08 | 北京交通发展研究中心 | The method of estimation of trip congestion probability |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10060599A1 (en) * | 2000-12-05 | 2002-06-06 | Peter Badenhop | Traffic information transmission system for use in vehicle has data received from information providers entered in databank and supplied to transmitter after conversion into broadcast signal |
| CN1953358A (en) * | 2005-10-05 | 2007-04-25 | Lg电子株式会社 | Method of processing traffic information and digital broadcast system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10060599A1 (en) * | 2000-12-05 | 2002-06-06 | Peter Badenhop | Traffic information transmission system for use in vehicle has data received from information providers entered in databank and supplied to transmitter after conversion into broadcast signal |
| CN1953358A (en) * | 2005-10-05 | 2007-04-25 | Lg电子株式会社 | Method of processing traffic information and digital broadcast system |
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