CN101294813B

CN101294813B - Navigation device and traffic information channel switching method

Info

Publication number: CN101294813B
Application number: CN2007100277616A
Authority: CN
Inventors: 张建阳; 杨善智
Original assignee: Mitac Computer Shunde Ltd; Mitac International Corp
Current assignee: Mitac Computer Shunde Ltd; Shunda Computer Factory Co Ltd; Mitac International Corp
Priority date: 2007-04-28
Filing date: 2007-04-28
Publication date: 2013-02-13
Anticipated expiration: 2027-04-28
Also published as: CN101294813A

Abstract

The invention discloses a navigation device and a method thereof for switching Traffic Message Channels. The processing module of the navigation device can adjust the weight of a plurality of Traffic Message Channels (TMC) and generate a TMC ranking table; when the intensity of the TMC signal detected by the TMC receiving module of the navigation device is lower than a threshold value, the TMC receiving module selects a preferential traffic message channel from the TMC ranking table for locking so as to increase the channel switching efficiency and the switching times of the TMC receiving module.

Description

Guider and traffic information channel switching method thereof

Technical field

The present invention is relevant for a kind of guider and traffic information channel switching method thereof, particularly relevant for a kind of guider and traffic information channel switching method thereof of setting up the TMC priority list.

Background technology

Traffic Message Channel (Traffic Message Channel, TMC) is a digital encoding system, is to utilize existing fm resources, inserts numerical code to be sent to a receiving end in broadcast message.Because numerical code and voice frequently signal separate, can't disturb radio reception and wireless tonequality so insert numerical code.TMC can provide continuous transport information, and for example traffic congestion or accident can be reported the site of an accident and time result.Its information has comprised the traffic in certain territorial scope.When guider is provided with the Traffic Message Channel receiver, just but receiving traffic information can show in many ways after the decoding of information, such as literal, figure or language, and the data that transport information comprises are shown on the map of guider.Therefore, in conjunction with TMC information and digital map navigation, can improve the accuracy of automobile navigation to the place ahead road condition predicting.

Because Traffic Message Channel sees through frequency modulation broadcasting, its being limited in scope of can containing of each broadcast base station, moreover if the driver travels in the city, then Traffic Message Channel also easily is subject to the impact of high building.When the TMC receiver module detects signal when too weak, can another available channel of automatic searching, find just to lock this channel behind the available channel and come receiving traffic information.Yet this kind way has following point:

(1) if the channel signals of locking is unstable, the TMC receiver module may need again to switch, and so causes TMC receiver module switching frequency too high.

(2) channel search must begin from lower frequency scanning, needs the long time just can find lockable channel.

(3) Real-time Traffic Information that the channel that locks provides may not be best.

Therefore, the channel switching efficiency that how to improve the TMC receiver module is a problem to be solved.

Description of drawings

Fig. 1 is the calcspar of the embodiment of guider of the present invention;

Fig. 2 is the schematic diagram of the spatial relationship of RDS of the present invention base station and guider;

Fig. 3 is the calcspar of the spatial relationship of RDS of the present invention base station and travel route; And

Fig. 4 is the flow chart of steps of the embodiment of traffic information channel switching method of the present invention.

Summary of the invention

In view of this, purpose of the present invention is providing a kind of guider and traffic information channel switching method thereof exactly, with channel switching efficiency and the minimizing switching times that improves the TMC receiver module.

For achieving the above object, the present invention proposes a kind of guider, and it comprises a database, a processing module, a TMC receiver module, a location module, a navigation module.Several electronic charts of database storage and several Traffic Message Channels (Traffic Message Channel, TMC) information, processing module is at least according in order to adjust the weight of these a little TMC, to produce a TMC priority list (ranking table).The TMC receiver module is in order to receiving a TMC broadcast singal, and the TMC broadcast singal is decoded into TMC data.Locating module provides a positional information, and navigation module is in order to planning the route that travels, and according to this route that travels, positional information and TMC data so that a navigation information to be provided.Wherein, when the intensity that detects present TMC signal when the TMC receiver module was lower than a threshold value, then the TMC receiver module selected in the TMC priority list a more preferential Traffic Message Channel to lock since then.

In addition, the present invention more proposes a kind of traffic information channel switching method, is applicable to a guider, and this guider has a TMC receiver module and a processing module, and the method comprises the following step: several TMC information is provided; Use this processing module, according at least one ordering rule, adjusting the weight of those TMC, and produce a TMC priority list; When the intensity that detects a TMC signal when this TMC receiver module was lower than a threshold value, then this TMC receiver module selected a more preferential Traffic Message Channel to lock in this TMC priority list.

Compared to prior art, the invention provides a kind of guider and traffic information channel switching method thereof, effectively improve the channel switching efficiency of TMC receiver module and reduce switching times.

Hereby further understand and understanding for your juror is had technical characterictic of the present invention and the effect that reaches, describe in detail below in conjunction with better enforcement.

Embodiment

Hereinafter with reference to correlative type, guider and traffic information channel switching method thereof according to preferred embodiment of the present invention are described, to be convenient to understand for making, the same components among the following embodiment illustrates with identical symbology.

See also Fig. 1, it is the calcspar of the embodiment of guider of the present invention.Among the figure, guider 1 comprises a database 10, a processing module 13, a TMC receiver module 14, a location module 15, a navigation module 16, a screen 101 and loudspeaker 102.Database 10 stores several electronically Figure 11 and several Traffic Message Channels (Traffic Message Channel, TMC) information 12, wherein, Figure 11 has the attached carrier system of frequency modulation (Radio Data System electronically, RDS) base station location 19, and TMC information can comprise signal quality information and the payment information of this TMC.

TMC receiver module 14 is in order to receiving a TMC broadcast singal, and this TMC broadcast singal is decoded into TMC data 141.Locating module 15 provides a positional information 151.Locating module 15 is a GPS module preferably.Starting point and destination that navigation module 16 is inputted according to electronically Figure 11, user, route 161 travels, and navigation module 16 according to travel route 161, positional information 151 and TMC data 14 so that a navigation information 18 to be provided, the information of " junction ahead please turn left " or " this highway section speed limit is 30 kilometers of speed per hours; Please drive carefully " etc. for example, these navigation information 18 alternatives are shown by screen 101 or export to point out the driver by loudspeaker 102.Processing module 13 is according to an ordering rule (describing in detail after holding), to produce a TMC priority list (ranking table) 131, and TMC receiver module 14 detects the intensity of TMC signal when being lower than a threshold value (threshold), then TMC receiver module 14 selects a more preferential Traffic Message Channel to lock, to continue to receive the TMC broadcast singal in TMC priority list 131.Guider 1 optionally can arrange a TMC channel search module 17, in order to detect in the process of moving the signal intensity of these a little TMC.

Processing module 13 can be adjusted the weight of each TMC at least according to following four kinds of ordering rules, discharge the priority of these a little TMC according to the weighted value of each TMC again, to produce TMC priority list 131.Below describe four kinds of ordering rules in detail.

Ordering rule 1: generally speaking, need the quality of the TMC of paying can be higher than the TMC that need not pay, the quality of domain type TMC can be higher than whole district type TMC, so processing module 13 can be adjusted according to TMC data 141 weight of each TMC, TMC or the quality of will charging preferably TMC heightened its weight.

Ordering rule 2:TMC broadcast singal is sent by the RDS base station, therefore, the TMC broadcast singal that then receives close to more from the base station is stronger, and the positional information 151 that processing module 13 can provide according to locating module 15 is judged each RDS base station location 19 and the distance between guider is far and near at present, its corresponding TMC of RDS base station that will be nearer heightens its weight, as shown in Figure 2, RDS base station 22 from driver 20 close to, and RDS base station 21 from driver 20 away from, therefore, the weight of RDS base station 22 is higher.

Ordering rule 3: because the TMC broadcast singal is subject to the impact of context, therefore, processing module can be according to the spatial relationship between the position of this a little RDS base station and travel route, such as the barrier state between RDS base station and travel route or ratio of the range of signal of RDS base station covering travel route etc., adjust the weight of TMC corresponding to this a little RDS base station.As shown in Figure 3, among the figure, arrow indicates driver 30 travel route, although RDS base station 32 from travel route close to, yet many high constructures 331,332,333 and 334 are arranged between RDS base station 32 and travel route, although and RDS base station 31 from travel route away from.But without obvious barrier, the interference that the TMC broadcast singal that send RDS base station 32 is subject to is less between RDS base station 32 and travel route, and the interference that the TMC broadcast singal that send RDS base station 31 is subject to is larger.Therefore, the weight of adjustable height RDS base station 32 corresponding TMC, the weight of reduction RDS base station 31 corresponding TMC.Similarly, the weight of the corresponding TMC in RDS base station that also ratio of adjustable height range of signal covering travel route is higher, the weight of the corresponding TMC in RDS base station that the ratio of reduction range of signal covering travel route is lower.

Ordering rule 4: if guider has configuration TMC channel search module 17, then processing module 13 can be adjusted according to the detecting result of TMC channel search module 17 weight of these a little TMC.

Processing module 13 can be adjusted the weight of each TMC according to the combination of above-mentioned four kinds of ordering rules, discharges the priority of these a little TMC according to the weighted value of each TMC again, to produce TMC priority list 131.And TMC priority list 131 is constantly updated in the Vehicle Driving Cycle process.In one embodiment, if database 10 stores 4 TMC information (TMC_A, TMC_B, TMC_C and TMC_D), and 4 shared weight proportions of ordering rule are respectively 25%, 20%, 20% and 35%, and then according to above-mentioned 4 ordering rules, these 4 TMC sequences of information are as follows:

Ordering rule 1 (25%)	Ordering rule 2 (20%)	Ordering rule 3 (20%)	Ordering rule 4 (35%)
				TMC_A	TMC_B	TMC_A	TMC_B
TMC_B	TMC_C	TMC_B	TMC_D
				TMC_D	TMC_D	TMC_C	TMC_A
TMC_C	TMC_A	TMC_D	TMC_C

Ordering is that first weighted value is 0.4 under each rule, and ordering be second weighted value is 0.3, and ordering is that the 3rd weighted value is 0.2, and ordering be the 4th weighted value is 0.1.Can learn at last, the weight of TMC_A is 0.27 (0.27=0.4 * 0.25+0.1 * 0.2+0.4 * 0.2+0.3 * 0.35), the weight of TMC_B is 0.355 (0.355=0.3 * 0.25+0.4 * 0.2+0.3 * 0.2+0.4 * 0.35), the weight of TMC_C is 0.16 (0.16=0.1 * 0.25+0.3 * 0.2+0.2 * 0.2+0.1 * 0.35), and the weight of TMC_D is 0.215 (0.215=0.2 * 0.25+0.2 * 0.2+0.1 * 0.2+0.3 * 0.35), therefore can obtain TMC priority list 131, as shown in Table 1.When the intensity that detects the TMC signal when TMC receiver module 14 was lower than a threshold value (threshold), then TMC receiver module 14 was according to TMC priority list 131, first to TMC_B to lock, to continue to receive the TMC broadcast singal.By TMC priority list 131, can improve the channel switching efficiency of TMC receiver module.

The TMC priority list
	TMC_B
TMC_A
	TMC_D
TMC_C

Table one

See also Fig. 4, it is the flow chart of steps of the embodiment of traffic information channel switching method of the present invention, the guider that the method is corresponding shown in Figure 1.Among the figure, the method comprises the following step:

Step 40: according to these a little TMC data 141 these a little TMC are sorted, to produce the first weight of each TMC;

Step 41: according to the spatial relationship of 161 of this a little RDS base station 19 and travel routes, 19 corresponding TMC sort to this a little RDS base station, to produce the second weight of each TMC;

Step 42: far and near with the distance of guider current position according to this a little RDS base station 19,19 corresponding TMC sort to this a little RDS base station, to produce the 3rd weight of each TMC;

Step 43: the detecting result according to TMC channel search module 17 sorts to these a little TMC, to produce the 4th weight of each TMC;

Step 44: according to the first weight, the second weight, the 3rd weight and the 4th weight of each TMC, with total weight of calculating each TMC and produce a TMC priority list 131;

Step 45: when the intensity that detects the TMC signal when TMC receiver module 14 was lower than a threshold value, then TMC receiver module 14 selected a more preferential TMC to lock in this TMC priority list 131.

The above only is illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and to its equivalent modifications of carrying out or change, all should be contained in the accompanying claim.

Claims

1. a guider is characterized in that, this guider comprises:

One database stores the information of several electronic charts and several Traffic Message Channels (Traffic Message Channel, TMC);

One TMC receiver module in order to receiving a TMC broadcast singal, and is decoded into TMC data with this TMC broadcast singal;

One TMC channel search module is in order to detect the signal intensity of those Traffic Message Channels;

One processing module, adjust the weight of those Traffic Message Channels according to the detecting result of at least one ordering rule and this TMC channel search module, and produce a TMC priority list (ranking table), wherein this ordering rule is for to judge whether this TMC is paying TMC;

One location module provides a positional information; And

One navigation module, planning one route that travels, and according to this travel route, this positional information and this TMC data so that a navigation information to be provided;

Wherein, when the intensity that detects this TMC signal when this TMC receiver module was lower than a threshold value, then this TMC receiver module selected a more preferential Traffic Message Channel to lock in this TMC priority list.

2. guider according to claim 1 is characterized in that, the information of those Traffic Message Channels comprises a signal quality information and a payment information.

3. guider according to claim 1 is characterized in that, this electronic chart more comprises the positional information of the attached carrier system of the corresponding frequency modulation of those TMC (Radio Data System, RDS) base station.

4. guider according to claim 3, it is characterized in that, this processing module is more according to the position of this base station and the spatial relationship between this travel route, adjust the weight of those Traffic Message Channels, and this spatial relationship is the barrier state between this base station and this travel route, and this spatial relationship also covers the ratio of this travel route for the range of signal of this base station.

5. guider according to claim 3 is characterized in that, this processing module is more far and near according to the distance between this base station and present this guider, adjusts the weight of those TMC.

6. guider according to claim 1 is characterized in that, this locating module is a GPS (GPS) module.

7. guider according to claim 1 is characterized in that, this guider is a portable electronic devices.

8. a traffic information channel switching method is applicable to a guider, and this guider has a TMC receiver module and a processing module, it is characterized in that, the method comprises the following step:

Several TMC information is provided;

Comprise configuration one TMC channel search module in this guider, this TMC channel search module is in order to detect the signal intensity of those TMC;

Use this processing module, according to the detecting result of at least one ordering rule and this TMC channel search module, adjusting the weight of those TMC, and produce a TMC priority list, wherein this ordering rule is for to judge whether this TMC is paying TMC;

When the intensity that detects a TMC signal when this TMC receiver module was lower than a threshold value, then this TMC receiver module selected a more preferential Traffic Message Channel to lock in this TMC priority list.

9. traffic information channel switching method according to claim 8 is characterized in that, those TMC information comprise a signal quality information and a payment information.

10. traffic information channel switching method according to claim 8 is characterized in that, more comprises the positional information that the attached carrier system of the corresponding frequency modulation of those TMC (Radio Data System, RDS) base station is provided.

11. traffic information channel switching method according to claim 10, it is characterized in that, this guider produces the route that travels, and this processing module is more according to the position of this base station and the spatial relationship between this travel route, adjust the weight of those TMC, and this spatial relationship is the barrier state between this base station and this travel route, and this spatial relationship also covers the ratio of this travel route for the range of signal of this base station.

12. traffic information channel switching method according to claim 10 is characterized in that, this processing module is more far and near according to the distance between this base station and present this guider, adjusts the weight of those TMC.

13. traffic information channel switching method according to claim 8 is characterized in that, this guider is a portable electronic devices.