CN101368827A - Communication navigation method, apparatus and communication navigation system - Google Patents
Communication navigation method, apparatus and communication navigation system Download PDFInfo
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Abstract
The invention discloses a communication navigation method and a device; the method comprises the following steps: the navigation terminal sends the navigation request information to the server, and the navigation request information comprises the starting point and the destination; based on the received navigation request information, the server calculates the navigation path and the information of the key points corresponding to the navigation path; the server sends the navigation path and the corresponding key point information to the navigation terminal; and the navigation terminal generates the guidance information corresponding to the key point information and then outputs the guidance information based on preset rules. The implementation of the invention helps solving the problems in the prior art that the user needs to make real-time observation of map data to determine the driving direction and route; the invention is very convenient to use and can greatly improve the driving safety.
Description
Technical field
The present invention relates to the network communications technology field, particularly relate to a kind of communication navigation method, device and a kind of communication navigation system.
Background technology
At present, along with the development of communication and geographical information technology, the communication navigation technology just is subjected to widespread use in growing field, drives, takes an excursion in an open country even navigation, aviation etc. as land.
Communication navigation is usually directed to three entities, as shown in Figure 1, comprises server S, network and navigation terminal A.Referring to Fig. 1, being example with the land road guide is described the process of communication navigation:
At first, navigation terminal A sends navigation requests information to server S, and this navigation requests information comprises starting point and destination; Server S is calculated guidance path and is obtained corresponding map datum according to the navigation requests information of receiving, described guidance path is the path of starting point to the destination, described map datum promptly is used for map, the terrain data in show navigator path, for example can comprise highway section, bridge and near building etc.Server S sends to navigation terminal A with guidance path and corresponding map datum; Navigation terminal A display map data also knows that on this map terrestrial reference knows described guidance path.In navigation procedure, come to provide communication navigation for the user by the current location of real-time show navigator terminal on this map.
In the process of utilizing above-mentioned air navigation aid to implement to navigate, the user must observe map datum that navigation terminal shows and current location at any time so that travel route and direction are made judgement, because the display screen of navigation terminal is less usually, shown map datum is also very limited, therefore, come travel direction and route are made very difficulty and inconvenient of judgement meeting by the Direct observation map datum.Particularly in traveling process, user's notice is often very concentrated, and the Direct observation map datum will influence user's notice greatly, cause very large potential safety hazard.
Summary of the invention
The objective of the invention is to solve that the user needs the Direct observation screen to obtain the use inconvenience that navigation information causes in the existing communication navigation technology, and the problem that causes potential safety hazard easily.
For addressing the above problem, the invention discloses a kind of communication navigation method, described method comprises: navigation terminal sends navigation requests information to server, and this navigation requests information comprises starting point and destination; Server according to the navigation requests information received calculate guidance path and with the corresponding key point information of this guidance path; Server is sent to navigation terminal with described guidance path and corresponding key point information; Navigation terminal generates and the corresponding induction information of described key point information; And export described induction information by presetting rule.
Preferably, described method also comprises:
Obtain the current location of navigation terminal; Judge according to the current location of navigation terminal whether navigation terminal goes off course, if guidance path is recomputated in driftage.
Preferably, described method also comprises:
Server will be sent to navigation terminal with the key point information that the navigation terminal current location is faced mutually; Navigation terminal generates and the corresponding induction information of this key point information.
Preferably, the corresponding induction information of described generation and key point information is one or more.
For addressing the above problem, the invention also discloses a kind of communication navigation device, described device comprises: communication unit, be used to send navigation requests information, this navigation requests information comprises starting point and destination; And reception guidance path and the corresponding key point information of this guidance path; Storage unit is used for guidance path and the corresponding key point information of this guidance path that the memory communicating unit receives; The induction information generation unit is used for generating corresponding induction information according to the key point information of cell stores; Output unit is used for the induction information that is generated by presetting rule output induction information generation unit.
Preferably, described device also comprises:
The position acquiring unit is used to obtain the current location of described device;
The driftage judging unit, the current location that is used for the device that obtains according to the position acquiring unit judges whether driftage, if driftage, the current location of described device is sent navigation requests message as starting point and by communication unit.
Preferably, the key point information obtained of described communication unit is the adjacent key point information of current location of the device that obtained with the position acquiring unit.
Preferably, the induction information that generated of described induction information generation unit is one or more.
The invention also discloses a kind of communication navigation system, comprise server and communication navigation terminal,
Described server comprises: first communication unit, be used to receive navigation requests information, and this navigation requests information comprises starting point and destination; Path-calculating element is used for calculating guidance path and corresponding key point information according to navigation requests information; And send guidance path and the corresponding key point information calculate by first communication unit;
Described navigation terminal comprises: second communication unit, be used to send navigation requests information, and this navigation requests information comprises starting point and destination; And reception guidance path and the corresponding key point information of this guidance path; Storage unit is used to store guidance path and the corresponding key point information of this guidance path that second communication unit receives; The induction information generation unit is used for generating corresponding induction information according to the key point information of cell stores; Output unit is used for the induction information that is generated by presetting rule output induction information generation unit.
Preferably, described server also comprises:
The position acquiring unit is used to obtain the current location of navigation terminal;
The driftage judging unit, the current location that is used for the navigation terminal that obtains according to the position acquiring unit judges whether it goes off course, if driftage, with the current location of the described navigation terminal starting point as navigation requests information; And this navigation requests information is sent to path-calculating element.
Compared with prior art, one embodiment of the invention have following effect:
In the process of utilizing prior art enforcement communication navigation, the user must observe map datum that navigation terminal shows and current location at any time so that travel route and direction are made judgement, because the display screen of navigation terminal is less usually, shown map datum is also very limited, therefore, come travel direction and route are made very difficulty and inconvenient of judgement meeting by the Direct observation map datum.Particularly in traveling process, user's notice is often very concentrated, and the Direct observation map datum will influence user's notice greatly, cause very large potential safety hazard.The present invention by generate at server end guidance path and with the corresponding key point information of guidance path, generate and the corresponding induction information of key point at navigation terminal, then in the process of moving, play described induction information by modes such as video, voice to the user, so, the user needn't judge travel direction and route by the Real Time Observation map datum, and is not only very easy to use, and greatly improved the security of travelling.
Description of drawings
Fig. 1 is the system architecture synoptic diagram of communication navigation in the prior art;
Fig. 2 is the flow chart of steps of the embodiment 1 of a kind of communication navigation method of the present invention;
Fig. 3 is the flow chart of steps of the enforcement 3 of a kind of communication navigation method of the present invention;
Fig. 4 is the structured flowchart of an embodiment of a kind of communication navigation device of the present invention;
Fig. 5 is the structured flowchart of an embodiment of a kind of communication navigation system of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
With reference to Fig. 2, Fig. 2 shows the flow chart of steps of the embodiment 1 of communication navigation method of the present invention.Below in conjunction with Fig. 2 this embodiment is described in detail.
Step 101: navigation terminal sends navigation requests information to server, and this navigation requests information comprises starting point and destination.
Navigation terminal of the present invention can be any equipment with wireless communication ability.For example, can be mobile unit, handheld device etc.
Step 102: server according to the navigation requests information received calculate guidance path and with the corresponding key point information of this guidance path.
Server calculates guidance path according to the road net data storehouse of storage in advance, and described road net data storehouse comprises the relation between highway section and the highway section.General, guidance path is made up of the highway section, and it is exactly to calculate the highway section formation of starting point to the destination that described server calculates guidance path.Preferably, navigation terminal also comprises constraint condition in the navigation requests information that server sends, server is according to the guidance path between this constraint condition and starting point and the destination, for example described constraint condition can be for distance between two points the shortest or time the shortest etc.Wherein, each highway section in the guidance path can be regarded as the set of being made up of a plurality of coordinate points that comprise positional information again, and described positional information can be and the corresponding longitude and latitude of described coordinate points.After calculating guidance path, server is according to the geometric configuration of the positional information calculation guidance path of each coordinate points in this guidance path, so, guidance path just can be regarded as a line with certain geometrical shape, wherein, continuous a plurality of coordinate points then might constitute the curve with certain angle.Be understood that, when the angle of certain section curve exceeds certain limit, mean that then the user need change direct of travel.Preferably, we surpass the point of inflexion on a curve of reservation threshold as key point with angle in the guidance path.In addition, the point that we also can be crossing with the highway section in other highway section and the guidance path is as key point.
Obtain the information relevant and set up the key point information table with described key point.The content example of this table is as follows:
| Field | Explanation |
| The position | The positional information of key point, for example longitude and latitude |
| Turn direction | Angle according to this key point place path curve is provided with turn direction, turns right as " 00 " expression, and " 01 " expression is turned left, and " 11 " expression is kept straight on |
| The turning dynamics | Angle according to this key point place path curve is provided with the turning dynamics, as 60 degree, 90 degree |
Step 103: server will be sent to navigation terminal with the corresponding key point information of guidance path.
Step 104: navigation terminal generates and the corresponding induction information of key point information.
Step 105: navigation terminal is by presetting rule output induction information.
The described key point that is used to generate induction information both can be whole key point, also can be the key point of part, and the present invention does not do qualification to this.When navigation terminal generates with the corresponding induction information of key point information, both can generate image or Word message is shown to the user by display screen, and also can generate voice document and play.The voice induction information that generates of key point A for example: " the place ahead arrives space flight bridge circuit mouth, please keep to the right, and prepares to turn right turning dynamics 90 degree ".
Preferably, the navigation terminal generation can be one with the corresponding induction information of key point information and also can be many.If generate many induction informations, can play different induction informations in the different position of distance key point, for example generated 3 induction informations: " 300 meters in the place ahead ... " " 200 meters in the place ahead ... " " 100 meters in the place ahead ... " for certain key point.So, according to certain interval, play induction information in the different position of distance key point the user is reminded, make the user can understand travel situations in real time, and can make anticipation to imminent action, behavior, further avoid the generation of driftage.
In embodiment 1 described communication navigation process, by induction information the route and the direction of travelling are in time made prompting, owing to no longer need user's Direct observation map datum, therefore not only very easy to use, and effectively avoided the potential safety hazard that causes because of dispersion attention.
Need to prove, when enforcement is of the present invention, induction information sends to navigation terminal after also can being calculated, be generated by server, and it is considered herein that, when the navigation terminal that the present invention proposes report automatically the scheme of induction information open after, that utilizes that server calculates that guidance path and induction information will become those of ordinary skills a kind ofly generally is familiar with and selects, this is because present communication navigation technology is inherited and development from local airmanship mostly, below this problem is described further:
Local navigation is meant that map and navigation application are all on navigation terminal, there is not communication module, all calculating is all on navigation terminal, the benefit of this navigation is, calculates comparatively fast, and the user experiences, there is not network delay, be the main flow of present navigation product, user's single purchase does not have later the cost that uses yet.But the problem of local navigation is
1. map upgrades slow, be appreciated that, navigation be unable to do without map, and map is according to the construction in city, even very slow of the variation of road (for example two way becomes one-way traffic etc.) reflection, the speed that present local navigation map upgrades is half a year to one year, and is for the city of fast development, still slower.
2. having relatively high expectations to navigation terminal, because all calculating are in this locality, in navigation procedure, the calculating of consumption of natural resource (CPU internal memory) is exactly path computing, because this bottleneck, navigating instrument or navigator are still higher relatively for the requirement of hardware, this has just caused the problem of hardware cost, on the equipment of low side, be difficult to run navigation, the particularly calculating in long path, the whole nation (for example from Qiqihar a certain place to the calculating in a certain place, Guangzhou) is very large for the consumption of resource, for road result as calculated can be obtained, just need the support of hardware in user's acceptable scope.
In order to overcome the problems referred to above, so, the communication navigation technology on the wireless data passage that is structured in mobile operator has been arranged.In order to save cost of development and to reduce development difficulty, existing technology just becomes those skilled in the art's general choice in the local navigation of employing, therefore map datum and a large amount of calculating are finished at server end in the communication navigation, and navigation terminal only is the displaying of a result of calculation, the work that is to say a large amount of consumption of natural resource such as path computing of will this locality being finished by navigation terminal originally in the navigation has been transplanted to high performance server and has been finished, and terminal is finished data display just as a browser need and got final product.It is generally acknowledged that the road is as calculated in service end, by wireless network result of calculation being passed to this mode of navigation terminal is communication navigation.
Above disclosed content as can be known according to the present invention, the key point information that is used to calculate induction information calculates according to guidance path, therefore, server end is after the calculating of finishing guidance path, calculate, generate key point simultaneously and corresponding induction information just becomes most effective account form, also just become those skilled in the art's general choice.But the present invention draws after relatively by test of many times, because induction information is generally the bigger video of capacity, speech data, by wireless network induction information is often needed to consume long time and higher cost from the downloaded to the navigation terminal, particularly when the network service is crowded, transmit a large amount of induction informations, tend to cause server and Internet resources to be taken in a large number, and the problem of server performance decline.So, make the promptness of whole communication navigation system descend rapidly, cause the problem that the navigation terminal Data Update is untimely, can't in time play induction information.Therefore, embodiment 1 adopts in the mode of navigation terminal calculating induction information and can avoid effectively calculating the problem that induction information caused at server end, has overcome the technology prejudice that those of ordinary skills may occur.
More than introduced the embodiment 1 of communication navigation method of the present invention.In the embodiments of the invention 2, by obtaining the current location of navigation terminal, judge according to the current location of described navigation terminal whether navigation terminal has departed from the precalculated position of guidance path then, promptly whether go off course, if driftage, then recomputate guidance path and corresponding key point information according to the current location of navigation terminal and original destination, navigation terminal obtains new guidance path and key point so that restart navigation then.Implementing when of the present invention, above-mentionedly judging whether navigation terminal driftage takes place promptly can be brought in by server and finish, and also can finish at navigation terminal.Finish the judgement of driftage compares with server end, the judgement of being gone off course by navigation terminal has reduced load and the pressure to server, has safeguarded its stability, and has improved the promptness of judging, but meanwhile, the performance of navigation terminal must satisfy corresponding requirement.Therefore, when enforcement is of the present invention, can determine it is the calculating and the judgement of being gone off course by server or navigation terminal according to actual needs by those skilled in the art, the present invention does not do qualification to this.
Among the embodiment 2, obtain the current location of navigation terminal and can obtain in several ways, for example: navigation terminal is sent to server with this coordinate then by the coordinate information of the current position of GPS (GPS) acquisition.In addition, also can obtain the current position of navigation terminal by mobile radio communication, for example: arrive the distance of the transmission time calculation base station of navigation terminal by measuring at least three signal of base station, finally determine the current location of navigation terminal then according to this distance to navigation terminal.Adopt which kind of mode to obtain the current location of navigation terminal, can when enforcement is of the present invention, decide in its sole discretion as required by those skilled in the art.
More than introduced the embodiment 2 of communication navigation method of the present invention, the not detailed part of this embodiment sees also embodiment 1 described content.
Embodiments of the invention 3 are with the difference of the foregoing description, after server obtains the current location of navigation terminal, only the key point information adjacent with the navigation terminal current location are sent to navigation terminal.For example, can in advance the adjacent several Key Points in navigation terminal current location the place ahead be sent to navigation terminal, navigation terminal also only generates and the corresponding induction information of this several Key Points.Below, referring to Fig. 3 this embodiment is described further:
Step 301: navigation terminal sends navigation requests information to server, and this navigation requests information comprises starting point and destination.
Step 302: server according to the navigation requests information received calculate guidance path and with the corresponding key point information of this guidance path.
Step 303: guidance path is sent to navigation terminal.
Step 304: navigation terminal show navigator path and corresponding map datum.
Step 305: server obtains the current location of navigation terminal, and the key point information adjacent with this current location is sent to navigation terminal.
Step 306: navigation terminal generates corresponding many induction informations according to the key point information of receiving.
Step 307: navigation terminal is play corresponding many induction informations respectively in the different position of distance the place ahead key point.
Step 308: judge whether driftage, if driftage, execution in step 309, otherwise, execution in step 310.
Step 309: as starting point, execution in step 301 then with current location for navigation terminal.
Step 310: judge whether to arrive the destination, if arrive, navigation finishes, otherwise, execution in step 308.
In the process of real-time navigation, when driftage takes place navigation terminal,, need recomputate guidance path and download new map datum in order to guarantee finally to arrive the destination.Because variation has taken place guidance path, therefore, key point information correspondingly also needs to regenerate, and at this moment, the key point information of original guidance path correspondence has then become invalid data.Only will be sent to navigation terminal in this example, but not send whole key point information, so with the key point information that the navigation terminal current location is faced mutually, when driftage takes place when, avoided transmitting invalid key point data, reduced volume of transmitted data, greatly reduced transmission cost.
A kind of communication navigation method of the present invention has below been described in conjunction with specific embodiments.Below, with reference to above relevant introduction of the present invention, with reference to Fig. 4 an embodiment of a kind of communication navigation device of the present invention is introduced simultaneously.As shown in Figure 4, described device 400 comprises:
Communication unit 410 is used to send navigation requests information, and this navigation requests information comprises starting point and destination; And reception guidance path and the corresponding key point information of this guidance path;
Storage unit 420 is used for guidance path and the corresponding key point information of this guidance path that memory communicating unit 410 receives;
Induction information generation unit 430 is used for generating corresponding induction information according to the key point information of storage unit 420 storages;
Output unit 440 is used for the induction information that is generated by presetting rule output induction information generation unit 430.
Preferably, described device also comprises:
Position acquiring unit 460 is used to obtain the current location of described device;
Driftage judging unit 450, the current location that is used for the device that obtains according to position acquiring unit 460 judges whether driftage, if driftage, the current location of described device is sent the navigation requests message as starting point and by communication unit 410.
Preferably, the key point information obtained of described communication unit 410 is the adjacent key point information of current location of the device that obtained with position acquiring unit 460.
Preferably, the induction information that generated of described induction information generation unit is one or more.
Below said apparatus is realized that a kind of preferred implementation of communication navigation is described:
At first, communication unit sends navigation requests information, and this navigation requests information comprises starting point and destination.Afterwards, if communication unit is received guidance path and the corresponding key point information of this guidance path, then with the data storage that receives in storage unit, the key point information that described communication unit obtains is the adjacent key point information of current location of the device that obtained with the position acquiring unit.The induction information generation unit generates corresponding one or more induction information according to the key point information that communication unit receives, and exports this induction information by output unit by presetting rule then.
Referring to Fig. 5, Fig. 5 shows the structural representation of an embodiment of a kind of communication navigation system of the present invention, and described system comprises server 500 and navigation terminal 600, and described server comprises:
First communication unit 510 is used to receive navigation requests information, and this navigation requests information comprises starting point and destination;
Path-calculating element 520 is used for calculating guidance path and corresponding key point information according to navigation requests information; And send guidance path and the corresponding key point information that calculates by first communication unit 510;
Described navigation terminal comprises:
Second communication unit 610 is used to send navigation requests information, and this navigation requests information comprises starting point and destination; And reception guidance path and the corresponding key point information of this guidance path;
Storage unit 620 is used to store guidance path and the corresponding key point information of this guidance path that second communication unit 610 receives;
Induction information generation unit 630 is used for generating corresponding induction information according to the key point information of storage unit 620 storages;
Output unit 640 is used for the induction information that is generated by presetting rule output induction information generation unit 630.
Preferably, described server also comprises:
Position acquiring unit 530 is used to obtain the current location of navigation terminal;
Driftage judging unit 540, the current location that is used for the navigation terminal that obtains according to the position acquiring unit judges whether it goes off course, if driftage, with the current location of the described navigation terminal starting point as navigation requests information; And this navigation requests information is sent to path-calculating element 520.
Preferably, the key point information obtained of described second communication unit 610 is the adjacent key point information of current location of the navigation terminal that obtained with position acquiring unit 530.
Preferably, the induction information that generated of described induction information generation unit 630 is one or more.
A kind of preferred implementation to above-mentioned communication navigation system is described below:
At first, second communication unit of navigation terminal sends navigation requests information to server, and this navigation requests information comprises starting point and destination; After first communication unit receives navigation requests information, calculate guidance path and corresponding key point information by the navigation requests information that path-calculating element receives according to first communication unit, then, by first communication unit guidance path that calculates is sent to navigation terminal; The position acquiring unit obtains the current location of navigation terminal in real time, will be sent to navigation terminal with the key point information that the navigation terminal current location is faced mutually by first communication unit; Second communication unit receives guidance path and key point information, and with the information stores that receives in storage unit; The induction information generation unit generates corresponding induction information according to the key point information of cell stores, then, exports the induction information that the induction information generation unit is generated by output unit by presetting rule; Meanwhile, the driftage judging unit judges according to the current location of the navigation terminal that the position acquiring unit obtains whether it goes off course, if driftage, with the current location of described navigation terminal starting point, this navigation requests information is sent to path-calculating element recomputates guidance path and corresponding key point information as navigation requests information.At last, both sides implement navigation according to newly-generated guidance path and key point information.
In the embodiment of another navigation communication system of the present invention, position acquiring unit and driftage judging unit are arranged in the navigation terminal, in navigation procedure, the navigation terminal current location that this driftage judging unit is obtained according to the position acquiring unit judges whether driftage, if driftage sends navigation requests information by second communication unit to server as starting point with this current location.
For device, system embodiment, because it is substantially corresponding to method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, identical similar part is mutually referring to getting final product between each embodiment, each embodiment stresses all is difference with other embodiment, and these difference parts all are applicable to other embodiment usually.
More than to a kind of communication navigation method provided by the present invention, device and a kind of communication navigation system, be described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a communication navigation method is characterized in that, described method comprises:
Navigation terminal sends navigation requests information to server, and this navigation requests information comprises starting point and destination;
Server according to the navigation requests information received calculate guidance path and with the corresponding key point information of this guidance path;
Server is sent to navigation terminal with described guidance path and corresponding key point information;
Navigation terminal generates and the corresponding induction information of described key point information; And export described induction information by presetting rule.
2. method according to claim 1 is characterized in that, described method also comprises:
Obtain the current location of navigation terminal; Judge according to the current location of navigation terminal whether navigation terminal goes off course, if guidance path is recomputated in driftage.
3. method according to claim 2 is characterized in that, described method also comprises:
Server will be sent to navigation terminal with the key point information that the navigation terminal current location is faced mutually; Navigation terminal generates and the corresponding induction information of this key point information.
4. according to claim 1,2 or 3 described methods, it is characterized in that the corresponding induction information of described generation and key point information is one or more.
5. a communication navigation device is characterized in that, described device comprises:
Communication unit is used to send navigation requests information, and this navigation requests information comprises starting point and destination; And reception guidance path and the corresponding key point information of this guidance path;
Storage unit is used for guidance path and the corresponding key point information of this guidance path that the memory communicating unit receives;
The induction information generation unit is used for generating corresponding induction information according to the key point information of cell stores;
Output unit is used for the induction information that is generated by presetting rule output induction information generation unit.
6. device according to claim 5 is characterized in that, described device also comprises:
The position acquiring unit is used to obtain the current location of described device;
The driftage judging unit, the current location that is used for the device that obtains according to the position acquiring unit judges whether driftage, if driftage, the current location of described device is sent navigation requests message as starting point and by communication unit.
7. device according to claim 6 is characterized in that, the key point information that described communication unit obtains is the adjacent key point information of current location of the device that obtained with the position acquiring unit.
8. according to claim 5,6 or 7 described devices, it is characterized in that the induction information that described induction information generation unit is generated is one or more.
9. a communication navigation system comprises server and communication navigation terminal, it is characterized in that described server comprises:
First communication unit is used to receive navigation requests information, and this navigation requests information comprises starting point and destination;
Path-calculating element is used for calculating guidance path and corresponding key point information according to navigation requests information; And send guidance path and the corresponding key point information calculate by first communication unit;
Described navigation terminal comprises:
Second communication unit is used to send navigation requests information, and this navigation requests information comprises starting point and destination; And reception guidance path and the corresponding key point information of this guidance path;
Storage unit is used to store guidance path and the corresponding key point information of this guidance path that second communication unit receives;
The induction information generation unit is used for generating corresponding induction information according to the key point information of cell stores;
Output unit is used for the induction information that is generated by presetting rule output induction information generation unit.
10. system according to claim 9 is characterized in that, described server also comprises:
The position acquiring unit is used to obtain the current location of navigation terminal;
The driftage judging unit, the current location that is used for the navigation terminal that obtains according to the position acquiring unit judges whether it goes off course, if driftage, with the current location of the described navigation terminal starting point as navigation requests information; And this navigation requests information is sent to path-calculating element.
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| CNA2007101203681A CN101368827A (en) | 2007-08-16 | 2007-08-16 | Communication navigation method, apparatus and communication navigation system |
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| CN112325895A (en) * | 2020-10-29 | 2021-02-05 | 腾讯科技（深圳）有限公司 | Navigation information processing method, terminal and server |
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