CN101153909A - Method for displaying time on navigation device of global positioning system - Google Patents
Method for displaying time on navigation device of global positioning system Download PDFInfo
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- CN101153909A CN101153909A CNA2006101223750A CN200610122375A CN101153909A CN 101153909 A CN101153909 A CN 101153909A CN A2006101223750 A CNA2006101223750 A CN A2006101223750A CN 200610122375 A CN200610122375 A CN 200610122375A CN 101153909 A CN101153909 A CN 101153909A
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Abstract
The invention discloses a displaying method for time on a GPS navigation device, the steps which includes: the GPS navigation device receives a signal from a navigation satellite; detecting positioning action of the GPS navigation device; detecting initialization action of the GPS navigation device; when the GPS navigation device completes the positioning action and the initialization action, then displaying the system time on a screen of the GPS navigation device. The displaying method of the invention for time on the GPS navigation device can not display predetermined time before counting the correct system time.
Description
[technical field]
The invention relates to the display packing of a kind of time, and particularly relevant for a kind of on global position system navigation apparatus the display packing of time.
[background technology]
It is a completely new concept that Global Positioning System (GPS) (Global Position System is called for short GPS) is applied to navigator fix, utilizes this Aquarian science and technology, and anyone can obtain correct position, speed and time easily.
The GPS development plan is to be presided over by U.S. Department of Defense, is participated in by Department of Transportation, and this technology is transferred to use among the people, is applied in the relevant operations such as navigator fix, precision measurement and standard time.GPS is the navigational system in conjunction with satellite and wireless technology, can provide the user accurately location, speed and time.The application of GPS extensively is present in existing market, and along with the progress of satellite science and technology, many global positioning system technology and business opportunity also just develop by leaps and bounds.GPS is confined to military unit in early days, and its purpose is at military use, for example degree of accuracy location of opportunity of combat, ships, vehicle, personnel, attack subject matter etc.Even to this day, GPS is open among the people.Use as the location, this in the flourishing expansion in market among the people, except providing the accurate localization, also can accurately provide message for speed, time, direction and distance in conjunction with the science and technology of deep space satellite and mechanics of communication, and the scope of utilization is quite extensive.
Use GPS, then just must have a global position system navigation apparatus to receive the signal of Navsat, come current position is positioned with signal according to received Navsat.And on known global position system navigation apparatus, as long as user's one start, the screen of global position system navigation apparatus will show a default time, and this Preset Time is the time of global position system navigation apparatus itself, is not the time on the Navsat.Therefore, also not finishing the shown time in when location when global position system navigation apparatus, is not the orthochronous of present global position system navigation apparatus position.So a lot of users when using global position system navigation apparatus at the beginning, and can't learn at present whether the shown time is exactly the correct time on screen, thereby have caused very big puzzlement on the time at correct judgment.
[summary of the invention]
Therefore, purpose of the present invention be exactly provide a kind of on global position system navigation apparatus the display packing of time, can before calculating correct system time, can on its screen, not show the default time.
The display packing of time provided by the present invention, it has comprised that global position system navigation apparatus receives the signal of a Navsat earlier, the present invention can begin to detect the location action of global position system navigation apparatus then, then detects the initialization action of global position system navigation apparatus again.When global position system navigation apparatus is located successfully, and also carry out initialization and finish, then showing on the global position system navigation apparatus that the correct system time of corresponding this Navsat is on its screen.
In an embodiment of the present invention, if global position system navigation apparatus no-fix also, or also do not finish initialization, then global position system navigation apparatus just can not be with time showing on screen.
In general, judge whether global position system navigation apparatus locatees successful step, comprise and judge whether global position system navigation apparatus receives the signal of four Navsats.
In addition, global position system navigation apparatus carries out initialized step, comprises the action of data download from the Navsat that receives signal.And global position system navigation apparatus data downloaded from the Navsat comprises satellite almanac data and Greenwich Mean Time.
In one embodiment of the invention, show the step of correct system time, comprised that elder generation downloads a Greenwich Mean Time from the Navsat that receives signal, and the present position of global position system navigation apparatus is positioned.Then according to the coordinate of the present position of global position system navigation apparatus, and Greenwich Mean Time of downloading and calculate present on-site orthochronous, again with correct time showing on the screen of global position system navigation apparatus.
Compared to prior art, because the present invention can judge whether global position system navigation apparatus locatees success earlier, and whether finish initialization in global position system navigation apparatus start just.Only locate successfully at global position system navigation apparatus, and finish under the situation of initialization action, the present invention just can be presented at correct system time on the screen of global position system navigation apparatus.Therefore, just can not cause the puzzlement of user on judgement time.
For purpose of the present invention, structural attitude and function thereof are had further understanding, conjunction with figs. is described in detail as follows now:
[description of drawings]
Fig. 1 has illustrated a kind of configuration diagram of GPS.
Fig. 2 has illustrated the flow chart of steps according to a preferred embodiment of the present invention a kind of display packing of time on global position system navigation apparatus.
Fig. 3 has illustrated the flow chart of steps according to a kind of correct judgment time of a preferred embodiment of the present invention.
[embodiment]
Fig. 1 has illustrated a kind of configuration diagram of GPS.GPS (GPS) is the collection of 24 Navsats.Each Navsat is the interior operation of accurate track of about 11,000 miles in top at the earth's surface.A global position system navigation apparatus (for example global position system navigation apparatus 101) is at least 3 Navsats of locking upwards, and response can determine the position that satellite is correct from the signal of satellite.But,, then only can position with regard to two dimensional surface if position with 3 Navsats.And if to carry out three-dimensional fix, then must lock the signal of 4 Navsats.Therefore, present global position system navigation apparatus all is 4 Navsats of locking, and for example Navsat 103,105,107 and 109.
Each Navsat all can transmit a kind ofly to be intended like the noise code signal of (Pseudo-noise is called for short PN) with one by modulation.Each PN sign indicating number comprises 1023 a series of chips (chip), and every millisecond of these chip are repeated with the speed that meets 1.023MHz.Each satellite transmits with same frequency.In the application at home, this frequency is known as L1 and 1575.42MHz.Global position system navigation apparatus 101 receives the signal that the transmission by its most individual satellites that can see mixes.The skew form of the signal that global position system navigation apparatus 101 receives by making and the PN sign indicating number of this satellite produces relevant and detects the transmission of a particular satellite.If the accurate position of correlativity is very high, will in the accurate position of correlativity (Correlation) that a specific skew and PN sign indicating number are reached, have a peak dot (peak), global position system navigation apparatus 101 will receive the transmission of the satellite of corresponding this peak dot.Then global position system navigation apparatus 101 use the PN sign indicating number that is offset with reach with from this satellite transmitting synchronous subsequently.
Global position system navigation apparatus 101 determines the distance of Navsat and global position system navigation apparatus from the code phase of the transmission of satellite by decision.Code phase (Code Phase is called for short CP) is exactly so-called delay with regard to the fragment of chip or chip.Global position system navigation apparatus 101 by the skew form that makes satellite PN sign indicating number with produce relevantly through the received signal behind Doppler (Doppler) offset correction, and determine the sign indicating number of a particular satellite to be offset.The code phase of each satellite be decided to be and received signals between degree of correlation be maximum skew.
Global position system navigation apparatus 101 is converted to time delay with the code phase of each Navsat.The transmission speed that time delay be multiply by from satellite can determine the distance of guider to satellite.Guider is also known the accurate track of each satellite simultaneously.The change of satellite position is given guider by each satellite transmits.This is by a low frequency (50Hz) data-signal modulation to the PN sign indicating number from satellite is transmitted and reaches.This data-signal will be from the locating information coding of satellite.Guider then uses this information to define the sphere that a guider should be positioned around the Navsat, and the radius of this sphere equals global position system navigation apparatus 101 by distance that code phase determined.In the present embodiment, global position system navigation apparatus 101 is that 4 Navsats (Navsat 103,105,107 and 109) are carried out this program.Global position system navigation apparatus 101 is known the tram at its place by inference from the intersection point between its defined 4 spheres.
Fig. 2 has illustrated the flow chart of steps according to a preferred embodiment of the present invention a kind of display packing of time on global position system navigation apparatus.Please refer to Fig. 2,, when for example global position system navigation apparatus has just been started shooting, just can carry out the present invention when rigidly connecting the signal of receiving Navsat when the global position system navigation apparatus 101 of for example Fig. 1 is carried out.
Please refer to Fig. 2, when global position system navigation apparatus as described in the step S200, when rigidly connecting the signal of receiving Navsat, it can be as described in the step S201, whether the detecting global position system navigation apparatus locatees success.In the present embodiment, whether the decision global position system navigation apparatus locatees successful key, be whether global position system navigation apparatus can lock the signal of four Navsats, and come current position is positioned according to the signal of the Navsat that is locked.When global position system navigation apparatus is located successfully (just step S201 indicated "Yes"), then as described in the step S203, whether the detecting global position system navigation apparatus finishes initialized action.
In the present embodiment, global position system navigation apparatus carries out initialized action, comprises from the Navsat that receives signal, downloads for example data such as satellite almanac data and Greenwich Mean Time.Wherein, satellite almanac data is the data of being sent by Navsat, information such as it has comprised each Navsat orbital position, troop.Download the speed that satellite almanac data can be promoted the global position system navigation apparatus searching satellite.In addition, the Greenwich Mean Time is to be used for representing the most basic meridian time zone (zero longitude), is preserved by the atomic clock on the Navsat.Atomic clock is to use the accurate clock of cesium element or rubidium element made, estimates that each 1,000,000 is only one second error is arranged.
Hold above-mentioned, if global position system navigation apparatus is not located successfully (just step S201 indicated "No"), or can't carry out initialize routine (just step S203 indicated "No"), then the present invention can not show that the time is on the screen of global position system navigation apparatus, the described content of step S205 just, so as not to cause the user on judging in the time error and the puzzlement that has.。Then, global position system navigation apparatus can continue repeating step S201 and S203, locate successfully (just step S201 indicated "Yes") until global position system navigation apparatus, and initialized program also finish (just step S203 indicated "Yes"), just can carry out step S207, just that the location is correct time showing is on the screen of global position system navigation apparatus.
In the present embodiment, global position system navigation apparatus can be realized by mobile phone with GPS-capable or PDA(Personal Digital Assistant).
Fig. 3 has illustrated the flow chart of steps according to a kind of correct judgment time of a preferred embodiment of the present invention.When global position system navigation apparatus is wanted the described content of execution in step S207, at first global position system navigation apparatus need be as described in the step S301, download present Greenwich Mean Time from the Navsat that receives signal, and also will be as described in the step S303, the position at present global position system navigation apparatus place is positioned.Behind the coordinate of learning present Greenwich Mean Time and present position, global position system navigation apparatus just can be according to the coordinate of present position, and the distance between the meridian time zone, and estimate the time zone of current position and the time difference between the meridian time zone.Cooperate present Greenwich Mean Time then, just can calculate present on-site orthochronous, just the described content of step S305.And obtain after the correct time, global position system navigation apparatus just can be presented at it on screen.
Claims (8)
1. the display packing of a time on global position system navigation apparatus is characterized in that, its step comprises:
This global position system navigation apparatus receives the signal of a Navsat;
Detect the location action of this global position system navigation apparatus;
Detect the initialization action of this global position system navigation apparatus; And
When this global position system navigation apparatus is finished this location action, and finish this initialization action, show that then a system time is on the screen of this global position system navigation apparatus.
2. as claimed in claim 1 on global position system navigation apparatus the display packing of time, it is characterized in that, more comprise when this location action, and this initialization action the two one of them imperfect tense, do not show that then this system time is on the screen of this global position system navigation apparatus.
3. as claimed in claim 1 on global position system navigation apparatus the display packing of time, it is characterized in that location action comprises the signal that receives four Navsats.
4. as claimed in claim 1 on global position system navigation apparatus the display packing of time, it is characterized in that this initialization action comprises the action of downloading data from the Navsat that receives signal.
5. as claimed in claim 4 on global position system navigation apparatus the display packing of time, it is characterized in that these data comprise a satellite almanac data and a Greenwich Mean Time.
6. as claimed in claim 1 on global position system navigation apparatus the display packing of time, it is characterized in that, show that the step of this system time comprises:
Download a Greenwich Mean Time from the Navsat that receives signal;
The present position of this global position system navigation apparatus is positioned;
According to the coordinate of this present position of global position system navigation apparatus, and should Greenwich Mean Time and calculate the present location time; And
With this present location time showing on the screen of this global position system navigation apparatus.
7. as claimed in claim 1 on global position system navigation apparatus the display packing of time, it is characterized in that this global position system navigation apparatus is one to have the mobile phone of GPS-capable.
8. as claimed in claim 1 on global position system navigation apparatus the display packing of time, it is characterized in that this global position system navigation apparatus is one to have the personal digital assistant of GPS-capable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101223750A CN101153909A (en) | 2006-09-25 | 2006-09-25 | Method for displaying time on navigation device of global positioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101223750A CN101153909A (en) | 2006-09-25 | 2006-09-25 | Method for displaying time on navigation device of global positioning system |
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| Publication Number | Publication Date |
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| CN101153909A true CN101153909A (en) | 2008-04-02 |
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| CNA2006101223750A Pending CN101153909A (en) | 2006-09-25 | 2006-09-25 | Method for displaying time on navigation device of global positioning system |
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- 2006-09-25 CN CNA2006101223750A patent/CN101153909A/en active Pending
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Open date: 20080402 |