CN101324660B - Method and apparatus for generating absolute time information and transmitting method and apparatus thereof - Google Patents
Method and apparatus for generating absolute time information and transmitting method and apparatus thereof Download PDFInfo
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- CN101324660B CN101324660B CN2007101188342A CN200710118834A CN101324660B CN 101324660 B CN101324660 B CN 101324660B CN 2007101188342 A CN2007101188342 A CN 2007101188342A CN 200710118834 A CN200710118834 A CN 200710118834A CN 101324660 B CN101324660 B CN 101324660B
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Abstract
The invention discloses a generation method of absolute time information. The generation method relates to the TOD information technology and is proposed to solve the risks of the prior TOD information. The adopted technical proposal is as follows: absolute seconds in the absolute time TOD information of a global positioning system GPS are extracted for carrying out the maintenance by a local clock, and the absolute seconds in the currently received GPS TOD information are replaced by the absolute seconds for the local maintenance, thereby generating the local TOD information; and the absolute seconds in the received GPS TOD information are further utilized for verifying the local TOD information. The invention simultaneously discloses a device for realizing the method and a sending method and a device for generating the absolute time information based on the generation method. The TOD information generated by using the generation method has accuracy, high reliability and self-restoration.
Description
Technical field
The present invention relates to clock technology is provided, relate to GPS (GPS or rather, GlobalPositioning System) absolute (TOD, Time of Day) the generation method and apparatus of information and the sending method and the device of GPS TOD information constantly.
Background technology
For any communication system, all need clock to provide frequency of operation for it, so clock performance is an importance that influences equipment performance, clock often is called as the heart of equipment, its importance has some idea of.For accuracy and the reliability that guarantees clock, all realize the synchronised clock of each equipment in the communication system at present by the time service of GPS.Each is received TOD information by time service equipment from gps satellite, parse the temporal information in the TOD information, the longitude of GPS receiver, latitude and altitude information, Satellite Tracking situation information etc., wherein the absolute second of the current absolute time of indication is extremely important for the application of communication synchronization in the temporal information, and its implication is normally with respect to 0 accumulative total number second on January 6th, 1980.The common per second of TOD information or transmission in per 2 seconds are once.As seen, TOD information is quite important for time service equipment, if TOD information dropout, be late for sending or receive mistake, the clock that all will directly influence time service equipment receives precision, and all can be affected, thereby cause immeasurable loss with the clock signal of this time service equipment other equipment that are the clock source.
Fig. 1 is for having the structural representation based on the TOD information provider unit of GPS now, as shown in Figure 1, existing clock generator based on GPS comprises GPS receiver 10 and local TOD maintenance of information unit 11, wherein GPS receiver 10 is used to receive the raw satellite signal that gps satellite sends, and receives TOD information wherein and is sent to local TOD maintenance of information unit 11.Local TOD maintenance of information unit 11 reception TOD information are also extracted wherein absolute second, utilize local clock to safeguard definitely second, utilize this this locality to replace absolute second in the received GPS TOD information and generate local TOD information absolute second again, should this locality TOD information export each time service equipment to again.Because the precision of local clock is can be guaranteed, and also be quite accurately the absolute second in the TOD information that structure shown in Figure 1 provides, and utilizes local clock to safeguard that the transmission of local TOD information also can guarantee the accurate of delivery time.But,, will cause absolute second error accumulation and can't will cause quite serious consequence from recovering in case the clock information mistake of local maintenance occurred.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of generation method and apparatus of absolute time information, and accurate, the with a high credibility and tool self-healing of the TOD information that is provided can be provided.
Fundamental purpose of the present invention is to provide a kind of generation sending method and device of absolute time information, makes the delivery time of TOD information of transmission accurate.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of generation method of absolute time information comprises:
Extract absolute second in the absolute constantly TOD information of global position system GPS, safeguard with local clock, with the absolute second of replacing in the current GPS TOD information that receives in absolute second of local maintenance, generate local TOD information, and utilize the absolute second described local TOD information of verification in the GPS TOD information that receives.
Wherein, the described maintenance with local clock comprised in absolute second:
Judge whether absolute second read-around ratio in the received GPS TOD information reaches setting threshold, when reaching setting threshold, with absolute second in the current GPS TOD information that the receives initial absolute second as the local clock maintenance.
Wherein, the local TOD information of the absolute second verification of described utilization comprises:
A, judge in the local TOD information to be sent absolute second whether with the current GPS TOD information that receives in absolute second synchronously, if the asynchronous step B that enters otherwise finishes to work as pre-treatment;
B, judge absolute second in absolute second and the GPS TOD information that received last time in the current GPS TOD information that receives whether continuous, if enter continuously step C, otherwise pre-treatment is worked as in end;
C, judge absolute second whether credible in the current GPS TOD information that receives, if the credible step D that enters, otherwise finish to work as pre-treatment;
Absolute second in D, the local TOD information of adjustment is synchronous with the absolute second in the current GPS TOD information that receives.
Wherein, also comprise after the step D:
Adjust local absolute second with the current GPS TOD information that receives in absolute second synchronously, and utilize local clock to continue to safeguard described this locality absolute second.
Wherein, judge receive absolute second among the above-mentioned steps C credible being specially whether:
Judge according to the clock indicating bit in the GPS TOD information that receives whether gps clock is reliable, if absolute second of reliably then receiving is credible, if unreliable absolute second of then receiving is insincere.
A kind of generating apparatus of absolute time information comprises:
TOD message pick-up and absolute second extraction unit are used to receive GPS TOD information and extract wherein absolute second;
Absolute second read-around ratio judging unit, be used to judge whether described TOD message pick-up and the absolute second read-around ratio that extraction unit extracted in absolute second reach setting threshold, export current absolute second of receiving to local absolute second maintenance unit when reaching setting threshold;
Local absolute second maintenance unit is used to utilize local clock to safeguard described absolute second that absolute second, the read-around ratio judging unit was exported; And
Local TOD information generating unit is used for generating local TOD information with the absolute second of the received GPSTOD information of replacement in absolute second of local maintenance.
Wherein, this device also comprises:
Local TOD information checking unit is used for utilizing the local TOD information of verification in absolute second of this GPS TOD information when receiving GPS TOD information.
Wherein, described local TOD information checking unit comprises:
Absolute second of local TOD information is judge module synchronously, be used for judging absolute second of local TOD information to be sent whether with the current GPS TOD information that receives in absolute second synchronously, if asynchronously then trigger absolute second continuously judge module;
Absolute second continuous judge module, be used for judging absolute second of the current GPS TOD information that receives with last time received GPS TOD information in absolute second whether continuous, consecutive hours triggers absolute second of credible judge module;
Absolute second credible judge module is used for judging whether absolute second of the current GPS TOD information that receives be credible, if crediblely then trigger local TOD information adjusting module; And
Local TOD information adjusting module, be used for adjusting absolute second of local TOD information with the current GPS TOD information that receives in absolute second synchronously, and it is synchronous with the absolute second in the current GPS TOD information that receives to trigger local absolute second of maintenance unit adjustment in local absolute second.
A kind ofly generate the sending method of absolute time information, comprising based on aforementioned generation method:
The transmission that utilizes this address clock to safeguard sends the local TOD information that is generated at interval.
A kind ofly generate the dispensing device of absolute time information, comprising based on aforementioned generation method:
Local clock provides the unit, is used to provide the local clock signal; And
Local maintenance interval and transmitting element are used for utilizing the transmission interval of described local clock signal maintenance to send the TOD information that generates.
The generation method and apparatus of absolute time information of the present invention at first extracts absolute second in the GPS TOD information that receives, utilize local high precision clock to safeguard this absolute second, recycle absolute second that this this locality replaced in the GPS TOD information that receives in absolute second, thereby generate local TOD information, simultaneously, come the absolute second in the GPS TOD information that utilization of the present invention receives the verification should this locality TOD information, judge whether it is that the local clock reason causes when the absolute second in local TOD information occurring is asynchronous with the absolute second in the received GPS TOD information, when determining absolute second in the TOD information of this this locality is adjusted, the while again extracts and safeguarded local absolute second.In the TOD information that the present invention generates absolute second is quite credible and accurate.
The sending method of the absolute time information of the present invention and frequency and the phase place and the GPS reference clock strict synchronism of installing the employing local clock, not reaction of transition to the GPS reference clock, therefore the transmission of local maintenance is very accurately at interval, and the moment of the local TOD information that is sent can be able to accurate assurance.
Description of drawings
Fig. 1 is the structural representation of existing TOD information provider unit;
Fig. 2 is the structural representation of TOD information generation device of the present invention;
Fig. 3 is the structural representation of the local TOD information checking of the present invention unit;
Fig. 4 is the process flow diagram of TOD information generating method of the present invention;
Fig. 5 is the flow chart of the absolute second local TOD information of verification in the GPS TOD information of the present invention's utilization;
Fig. 6 the present invention is based on the structural representation that the generation method generates the TOD information transmitting apparatus;
Fig. 7 the present invention is based on the process flow diagram that the generation method generates the TOD method for sending information.
Embodiment
Core concept of the present invention is: extract absolute second in the GPS TOD information that receives, utilize local high precision clock to safeguard this absolute second, again with replacing absolute second in the GPS TOD information that receives and generate local TOD information local absolute second, recycle and come absolute second in the received GPS TOD information verification should this locality TOD information, absolute second in the local TOD information that the present invention generates be accurately credible.Simultaneously, the transmission interval that utilizes local clock to safeguard sends local TOD information, and the delivery time that is sent to each time service equipment is also quite accurate.Below in conjunction with accompanying drawing technical scheme of the present invention is elaborated.
Fig. 2 is the structural representation of TOD information generation device of the present invention, as shown in Figure 2, TOD information generation device of the present invention comprises: TOD message pick-up and absolute second extraction unit 200, absolute second read-around ratio judging unit 201, local absolute second maintenance unit 202, local TOD information generating unit 203 and local TOD information checking unit 204.Wherein, the GPS TOD information that the reception of TOD information and absolute second extraction unit 200 are used for receiving is also extracted wherein absolute second, and is sent to absolute second read-around ratio judging unit 201 the absolute second that will extract.As a kind of realization, TOD information receives and an absolute second extraction unit 200 can be the GPS receiver.Absolute second read-around ratio judging unit 201 is used for judging whether the absolute second read-around ratio that the reception of TOD information and absolute second extraction unit 200 extract reaches setting threshold, exports current absolute second of receiving to local absolute second maintenance unit 202 when reaching setting threshold.The present invention receives soon it to be carried out local maintenance in absolute second in the TOD information, will to carrying out Reliability Distinguishing the absolute second that receives, carry out local maintenance in the situation reliably in absolute second in be sure oing received GPS TOD information before safeguarding again.Usually, if absolute second in the GPS TOD information that receives continuously is continuous, and continued a period of time, can think that current absolute second of receiving is reliable.Certainly, the setting threshold here can be set as required, and threshold value setting can be more than 1 time or 1 time.For example, if the TOD information transmission frequency be 1 second each, threshold setting is 10, and the first time is continuous to the absolute second in the tenth TOD information that once receives, and then absolute second in the tenth GPS TOD information that once receives is safeguarded as this locality in initial absolute second.Add the arbitrary absolute second that can certainly receive for 10 times in the past with current absolute second difference and safeguarded in absolute second as this locality.
For therefrom selecting as local absolute second GPS TOD information, judge by the clock indicating bit of this GPS TOD information whether gps clock is reliable, thereby verify again whether the absolute second in the described GPS TOD information is reliable.This judgement is optionally, is reliable after an absolute second read-around ratio reaches setting threshold.
This locality absolute second of maintenance unit 202 is used to utilize local clock to safeguard the absolute second of absolute read-around ratio judging unit 201 outputs second.Because the frequency of local clock and phase place and GPS reference clock are strictly synchronous, to the not reaction of transition of GPS reference clock, local absolute second that therefore safeguards is highly believable, generally can not be subjected to the impact of extraneous factor.
Local TOD information generating unit 203 is used for generating local TOD information with the absolute second of the received GPSTOD information of replacement in absolute second of local maintenance.For example, the current GPS TOD information that received, this locality is added a GPS TOD information absolute second automatically to be sent back at interval and replaces in this current received GPS TOD information absolute second, keep remaining information such as longitude, latitude and altitude information, Satellite Tracking situation information is constant, thereby generates next local TOD information to be sent at interval.Even because network is former thereby do not receive TOD information, local TOD information generating unit 203 can last received GPS TOD information be that the basis generates local TOD information still, can guarantee that still absolute second in the TOD information of this this locality is credible.Even or the TOD information errors that receives, utilize absolute second in the local TOD information that generation method of the present invention generates still credible.
Local TOD information checking unit 204 is used for utilizing the local TOD information of verification in absolute second of this GPSTOD information when receiving GPS TOD information.If caused mistake occurs the absolute second in the TOD information of local maintenance owing to local clock, the present invention can utilize absolute second in the received GPS TOD information in time absolute second in the local TOD information to be adjusted, and accumulation can not make the mistake.Automatic recovery ability is arranged the absolute second in the local TOD information that the present invention safeguards.
Below describe local TOD information checking of the present invention unit 204 in detail.
Fig. 3 is the structural representation of the local TOD information checking of the present invention unit, as shown in Figure 3, local TOD information checking of the present invention unit 204 comprises: absolute second of local TOD information is judge module 300, absolute second judge module 301, absolute second credible judge module 302 and local TOD adjusting module 303 continuously synchronously.Wherein, the input of absolute second synchronous judge module 300 of local TOD information is connected to the output of the reception of TOD information and absolute second extraction unit 200 and local TOD information generating unit 203, be used for to judge absolute second of the local TOD information to be sent that generates whether with current received GPS TOD information in absolute second synchronously, if absolute second continuous judge module 301 of asynchronous then triggering, otherwise do not deal with.The local TOD information that generates according to aforementioned local TOD information generating unit 203 as can be known, here judge whether it is to judge to add absolute second in the current GPS TOD information that receives whether one equated with TOD information to be sent after sending the interval in absolute second synchronously, if equal then think synchronously, otherwise asynchronous.Continuously judge module 301 be used for judging absolute second of current received GPS TOD information with last time received GPS TOD information in absolute second whether continuous, if then trigger continuously absolute second of credible judge module 302, otherwise do not deal with.Absolute second credible judge module 302 is used for judging whether absolute second of current received GPSTOD information be credible, if crediblely then trigger local TOD information adjusting module 303, otherwise do not deal with.Those skilled in the art are to be understood that, clock indicating bit in the GPS TOD information that can pass through to receive judges whether gps clock is reliable, thereby can judge whether the absolute second in the GPS TOD information is reliable, if gps clock is reliable, then whether believe absolute second in the GPS TOD information, repeats no more here.Local TOD information adjusting module 303 be used for adjusting absolute second of local TOD information with current received GPS TOD information in absolute second synchronously, and trigger local absolute second maintenance unit 202 adjust local absolute second with current received GPS TOD information in absolute second synchronous.
It will be appreciated by those skilled in the art that aforesaid each modular unit can reach relevant program by chip and realize, or realized by logic circuit.
Because the present invention adopts in the GPS TOD information absolute second reliably as local initial absolute second, and adopt local clock to safeguard, so local absolute second is accurate and continuous, be not subjected to external interference, therefore the absolute second in the local local TOD information that generated in absolute second of utilization is very accurate and credible, for preventing accident, come the absolute second in this TOD information of verification the absolute second in the GPS TOD information that the present invention's recycling receives, in order in time adjust the absolute second in the local TOD information when mistake appears in local clock.To guarantee completely accurate and stable absolute second in the TOD information that the present invention generates.
Fig. 4 is the process flow diagram of TOD information generating method of the present invention, and as shown in Figure 4, TOD information generating method of the present invention may further comprise the steps:
Step 401: extract absolute second in this GPS TOD information according to the GPS TOD information that receives.
Step 402: whether the absolute second read-around ratio of being extracted in the determining step 501 reaches setting threshold, absolute second with in the current GPS TOD information that receives when reaching setting threshold as local initial absolute second, and utilize local clock to safeguard this this locality absolute second.Specifically can be referring to the associated description of TOD information generation device part of the present invention.
Step 403: utilize replace absolute second in the received GPS TOD information and generate local TOD information the absolute second of safeguarding in the step 502.Specifically can be referring to the associated description of TOD information generation device part of the present invention.
Step 404: utilize the local TOD information of verification in absolute second in the received GPS TOD information.Be elaborated below with reference to Fig. 5.
Fig. 5 is the process flow diagram of the absolute second local TOD information of verification in the GPS TOD information of the present invention's utilization, and as shown in Figure 5, the present invention utilizes the step of the absolute second local TOD information of verification to comprise:
Step 501: judge in the local TOD information to be sent absolute second whether with current received GPS TOD information in absolute second synchronously, if the asynchronous step 502 that enters finishes to work as pre-treatment otherwise enter step 505.Detailed process about synchronous judgement can be referring to the associated description of TOD information generation device part of the present invention.
Step 502: judge in the current received GPS TOD information absolute second with the GPS TOD information that received last time in absolute second whether continuous, if then enter continuously step 503, work as pre-treatment otherwise enter step 505 end.Continuous judgement can be referring to the associated description of TOD information generation device part of the present invention in absolute second.
Step 503: judge absolute second in the current received GPS TOD information whether credible, if crediblely then enter step 504, finish to work as pre-treatment otherwise enter step 505.Clock indicating bit in the GPS TOD information of passing through to receive judges whether gps clock is reliable, thereby can judge whether the absolute second in the GPS TOD information is reliable.If gps clock is reliable, then whether believe absolute second in the GPS TOD information.
Step 504: absolute second of adjusting in absolute second and the current received GPS TOD information in the local TOD information is synchronous.Adjust simultaneously local absolute second with current received GPS TOD information in absolute second synchronously, and utilize local clock to continue maintenance.
Fig. 6 the present invention is based on the structural representation that the generation method generates the TOD information transmitting apparatus, and as shown in Figure 6, TOD information transmitting apparatus of the present invention comprises: local clock provides unit 600 and local maintenance to take care of hair at interval and send unit 601.Wherein, local clock provides unit 600 to be used to provide the local clock signal.Here, the frequency of the local clock that is adopted and phase place and GPS reference clock strict synchronism.Local maintenance interval hair care send unit 601 to be used for utilizing the transmission interval of local clock signal maintenance to send the TOD information that generates by aforementioned generation method or device.Local maintenance interval and transmitting element 601 are for the transmission interval of safeguarding a local TOD information according to GPS TOD information, as described in the background art 1 second or 2 seconds, the TOD information of local maintenance send the interval, and can to guarantee to send local TOD information delivery time accurate.It will be appreciated by those skilled in the art that when using TOD information transmitting apparatus of the present invention to send the local TOD information that TOD information generating method of the present invention or device generate, more can guarantee local TOD information accurately and credible.
Fig. 7 the present invention is based on the process flow diagram that the generation method generates the TOD method for sending information, and as shown in Figure 7, TOD method for sending information of the present invention comprises:
Step 701: utilize local clock to safeguard that a high-precision local TOD information sends the interval.
Step 702: send the local TOD information that generates by aforementioned generation method or device to be sent when arriving at each clock that sends the interval.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (9)
1. the generation method of an absolute time information is characterized in that, this method comprises:
Extract absolute second in the absolute constantly TOD information of global position system GPS, safeguard with local clock, with the absolute second of replacing in the current GPS TOD information that receives in absolute second of local maintenance, generate local TOD information, and utilize the absolute second described local TOD information of verification in the GPS TOD information receive
The described maintenance with local clock comprises: judge whether absolute second read-around ratio in the received GPS TOD information reaches setting threshold, when reaching setting threshold, with absolute second in the current GPS TOD information that the receives initial absolute second as the local clock maintenance.
2. the generation method of absolute time information according to claim 1 is characterized in that, the local TOD information of the absolute second verification of described utilization comprises:
A, judge in the local TOD information to be sent absolute second whether with the current GPS TOD information that receives in absolute second synchronously, if the asynchronous step B that enters otherwise finishes to work as pre-treatment;
B, judge absolute second in absolute second and the GPS TOD information that received last time in the current GPS TOD information that receives whether continuous, if enter continuously step C, otherwise pre-treatment is worked as in end;
C, judge absolute second whether credible in the current GPS TOD information that receives, if the credible step D that enters, otherwise finish to work as pre-treatment;
Absolute second in D, the local TOD information of adjustment is synchronous with the absolute second in the current GPS TOD information that receives.
3. the generation method of absolute time information according to claim 2 is characterized in that, also comprises after the step D:
Adjust local absolute second with the current GPS TOD information that receives in absolute second synchronously, and utilize local clock to continue to safeguard described this locality absolute second.
4. the generation method of absolute time information according to claim 2 is characterized in that, judge receive absolute second among the step C credible being specially whether:
Judge according to the clock indicating bit in the GPS TOD information that receives whether gps clock is reliable, if absolute second of reliably then receiving is credible, if unreliable absolute second of then receiving is insincere.
5. the sending method based on absolute time information that claim 1 generates is characterized in that, this method comprises:
The transmission that utilizes this address clock to safeguard sends the local TOD information that is generated at interval.
6. the generating apparatus of an absolute time information is characterized in that, this device comprises:
TOD message pick-up and absolute second extraction unit are used to receive GPS TOD information and extract wherein absolute second;
Absolute second read-around ratio judging unit, be used to judge whether described TOD message pick-up and the absolute second read-around ratio that extraction unit extracted in absolute second reach setting threshold, export current absolute second of receiving to local absolute second maintenance unit when reaching setting threshold;
Local absolute second maintenance unit is used to utilize local clock to safeguard described absolute second that absolute second, the read-around ratio judging unit was exported; And
Local TOD information generating unit is used for generating local TOD information with the absolute second of the received GPSTOD information of replacement in absolute second of local maintenance.
7. the generating apparatus of absolute time information according to claim 6 is characterized in that, this device also comprises:
Local TOD information checking unit is used for utilizing the local TOD information of verification in absolute second of this GPS TOD information when receiving GPS TOD information.
8. the generating apparatus of absolute time information according to claim 7 is characterized in that, described local TOD information checking unit comprises:
Absolute second of local TOD information is judge module synchronously, be used for judging absolute second of local TOD information to be sent whether with the current GPS TOD information that receives in absolute second synchronously, if asynchronously then trigger absolute second continuously judge module;
Absolute second continuous judge module, be used for judging absolute second of the current GPS TOD information that receives with last time received GPS TOD information in absolute second whether continuous, consecutive hours triggers absolute second of credible judge module;
Absolute second credible judge module is used for judging whether absolute second of the current GPS TOD information that receives be credible, if crediblely then trigger local TOD information adjusting module; And
Local TOD information adjusting module, be used for adjusting absolute second of local TOD information with the current GPS TOD information that receives in absolute second synchronously, and it is synchronous with the absolute second in the current GPS TOD information that receives to trigger local absolute second of maintenance unit adjustment in local absolute second.
9. the dispensing device based on absolute time information that claim 1 generates is characterized in that, this device comprises:
Local clock provides the unit, is used to provide the local clock signal; And
Local maintenance interval and transmitting element are used for utilizing the transmission interval of described local clock signal maintenance to send the TOD information that generates.
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| CN1353347A (en) * | 2000-11-15 | 2002-06-12 | 柴超 | Time calibration method and controller |
| CN1421751A (en) * | 2001-11-30 | 2003-06-04 | 精中（珠海）表业有限公司 | Low-power consumption precise timer and its precision correcting equipment, system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1353347A (en) * | 2000-11-15 | 2002-06-12 | 柴超 | Time calibration method and controller |
| CN1421751A (en) * | 2001-11-30 | 2003-06-04 | 精中（珠海）表业有限公司 | Low-power consumption precise timer and its precision correcting equipment, system and method |
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