CN101727065B - High-precision time service method of lock losing clock with two-way IRIG-B code - Google Patents
High-precision time service method of lock losing clock with two-way IRIG-B code Download PDFInfo
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- CN101727065B CN101727065B CN2008102305776A CN200810230577A CN101727065B CN 101727065 B CN101727065 B CN 101727065B CN 2008102305776 A CN2008102305776 A CN 2008102305776A CN 200810230577 A CN200810230577 A CN 200810230577A CN 101727065 B CN101727065 B CN 101727065B
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Abstract
The invention discloses a high-precision time service method of a lock losing clock with two-way IRIG-B code, comprising two time maintenance time-service systems, and the system comprises a time maintenance module and an IRIG-B code transceiving module; in the two time maintenance time-service systems, at least one time maintenance time-service system is in a clock tracking lock state; the two-way IRIG-B code is adopted to be transmitted mutually in the two time maintenance time-service systems, so as to respectively record the receiving time of the two-way IRIG-B code in each time maintenance time-service system and the time difference of the marked time of the time maintenance module in the system; the time for transmitting time sign to the time maintenance time-service system which is in a clock lock-losing state from the time maintenance time-service system which is in a clock tracking lock state is calculated, so as to adjust the clock of the time maintenance time-service system which is in a clock lock-losing state. The method can solve the situation that the time service equipment at one end loses time source owning to a certain reason.
Description
Technical field
The invention belongs to the timing equipment field, specifically relate to a kind of method of the losing lock clock being carried out the high precision time service by two-way IRIG-B sign indicating number transmission.
Background technology
Timing code IRIG-B with its actual superior function, becomes the standard code type of timing equipment first-selection as a kind of important time synchronized transmission manner, is applied to important industry or departments such as telecommunications, electric power, military affairs widely.IRIG is the abbreviation of U.S.'s target range instrument group, and U.S.'s target range instrument group is the affiliated institutions of the U.S. Range Command council.The IRIG time standard has two big classes: a class is a parallel time sign indicating number form, and this class sign indicating number is owing to be parallel form, and transmission range is nearer, and is scale-of-two, and it is extensive therefore to can not show a candle to serial form; Another kind of is the serial timing code, has six kinds of forms, i.e. A, B, D, E, G, H.Their main difference is the frame rate difference of timing code, and IRIG-B is Type B sign indicating number wherein.The time frame rate of Type B sign indicating number is 1 frame/s; Can transmit 100 information.As widely used timing code, the following principal feature of Type B sign indicating number tool: carry and contain much information, after decoding, can obtain 1,10,100, the pulse signal of 1000c/s and the temporal information and the control function information of BCD coding; High resolving power; B sign indicating number bandwidth after the modulation is applicable to long-distance transmissions; Divide direct current, exchange two kinds; Have nuclear interface standardizing, international etc.
In actual applications, the important events in some field need the timing equipment duplex configuration, have improved available rate, the reliability of timing equipment like this, and some equipment may be because the time service equipment that distance, space environment, electromagnetic environment or other reasons need be simplified.At this moment, service time, sign indicating number IRIG-B was a kind of economy, quick and easy mode as the time synchronized transmission manner.
But, cause an end time service equipment to lose time source for a certain reason, and can only rely on the time service of IRIG-B sign indicating number the time, because the signal demand of equipment output: 1, level conversion; 2, transmission; 3, level conversion; 4, a series of influences such as device interior signal transmission delay, time service precision and accuracy can be disturbed to a certain extent, can be subjected to the interference of certain stochastic process.Therefore, need a kind of method that the signal transmission delay interferes with the time service precision of introducing of eliminating.
Summary of the invention
The objective of the invention is to utilize two-way IRIG-B sign indicating number to carry out the temporal information exchange, a kind of method that the losing lock clock is carried out the high precision time service is provided, can eliminate the time tag system for transmitting error of the unidirectional time service of clock automatically.
For achieving the above object, the present invention is by the following technical solutions:
The present invention includes two independently time maintenance time dissemination systems, above-mentioned time maintenance time dissemination system includes time maintenance module and IRIG-B sign indicating number transceiver module; In two time maintenance time dissemination systems, exist a time maintenance time dissemination system to be in the clock tracing lock-out state at least; Use the transmission mutually in two time maintenance time dissemination systems of two-way IRIG-B sign indicating number, write down two-way IRIG-B the sign indicating number time of reception and this internal system time maintenance module institute mark time difference constantly in each time maintenance time dissemination system respectively; Time difference according to record calculates, the time maintenance time dissemination system that is in the clock tracing lock-out state is to the spent time of sign in the time maintenance time dissemination system transmission time of clock out-of-lock condition, thereby draw adjustment amount, and then adjust the clock of the time maintenance time dissemination system that is in the clock out-of-lock condition.
The present invention includes following steps:
1. be in the time maintenance time dissemination system A output IRIG-B sign indicating number of clock tracing lock-out state, and at whole second output constantly to the time pulse;
2. the time maintenance time dissemination system B that is in the clock out-of-lock condition receives the IRIG-B sign indicating number, and adjusts moment second that native system internal time maintenance module is safeguarded, makes the time synchronized of the time of reception and time maintenance module;
3. after the time maintenance time dissemination system B that is in the clock out-of-lock condition received IRIG-B sign indicating number from time maintenance time dissemination system A, round-trip transmission was once at least in time maintenance time dissemination system A and time maintenance time dissemination system B then to make the IRIG-B sign indicating number; Write down each time maintenance time dissemination system simultaneously respectively and receive the moment and native system time maintenance module institute mark time difference constantly of IRIG-B sign indicating number, thereby obtain time-delay and t;
4. after time maintenance time dissemination system B received the IRIG-B sign indicating number that passback comes, time-delay that obtains simultaneously and t calculated adjustment amount T, adjusted the clock time among the time maintenance time dissemination system B of a clock out-of-lock condition then at least.
A, be in the difference t of the moment and native system internal time maintenance module clock time of the time maintenance time dissemination system B recorder IRIG-B sign indicating number of clock out-of-lock condition
1, and difference t
1Join the time maintenance module clock and return in the control bit of IRIG-B sign indicating number, transfer to time maintenance time dissemination system A;
B, time maintenance time dissemination system A receive the IRIG-B sign indicating number, and the difference t of the moment of recorder IRIG-B sign indicating number and native system internal time maintenance module clock time
2, and calculate time-delay and t, i.e. t=t
1+ t
2, time-delay and t joined to prepare export in the IRIG-B sign indicating number control bit of time maintenance time dissemination system B, export the IRIG-B sign indicating number then.
Above-mentioned adjustment amount T is the arithmetic mean of twice difference, i.e. T=(t
1+ t
2)/2.
Above-mentioned IRIG-B sign indicating number adopts and exchanges AC code data modulation format.
Adopt the present invention of technique scheme, the present invention utilizes two-way channel transmission IRIG-B sign indicating number and mistiming, extrapolate the time clockwise that is in the tracking lock state and be in spent time of clock transfer time tag of clock out-of-lock condition, can obtain split-second precision, calculated amount is little, automatically eliminate the time tag system for transmitting error of the unidirectional time service of clock, do not needed manual intervention.The present invention can solve the situation that causes an end time service equipment to lose time source for a certain reason, is applicable to that also some equipment can only rely on the situation of IRIG-B sign indicating number time service.In addition, the channel of transmitted in both directions IRIG-B timing code both can use RS422/485 level connected mode, also can use optical fiber transmitting-receiving mode.The data-modulated form of transmitted in both directions IRIG-B timing code promptly can use the AC sign indicating number also can use the DC sign indicating number.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is realization flow figure of the present invention.
Embodiment
As shown in Figure 1 and Figure 2, present embodiment comprises two independently time maintenance time dissemination systems, two time maintenance time dissemination systems include time maintenance module and IRIG-B sign indicating number transceiver module, and above-mentioned time maintenance module and IRIG-B sign indicating number transceiver module are technology well known to those of ordinary skill in the art.In two time maintenance time dissemination systems, time maintenance time dissemination system A is in the clock tracing lock-out state, and time maintenance time dissemination system B is in the clock out-of-lock condition.
Use the transmission mutually in two time maintenance time dissemination systems of two-way IRIG-B sign indicating number, write down two-way IRIG-B the sign indicating number time of reception and this internal system time maintenance module institute mark time difference constantly in each time maintenance time dissemination system respectively, time difference according to record calculates, the time maintenance time dissemination system that is in the clock tracing lock-out state is to the spent time of sign in the time maintenance time dissemination system transmission time of clock out-of-lock condition, thereby draw adjustment amount, and then adjust the clock of the time maintenance time dissemination system that is in the clock out-of-lock condition.
In the present embodiment, the channel of transmitted in both directions IRIG-B sign indicating number uses RS422/485 level connected mode, and its two-way IRIG-B sign indicating number adopts and exchanges AC code data modulation format.
Specifically, present embodiment may further comprise the steps: as shown in Figure 2,
1. be in the time maintenance time dissemination system A output IRIG-B sign indicating number of clock tracing lock-out state, and UCT output constantly in whole second to the time pulse.
2. the time maintenance time dissemination system B that is in the clock out-of-lock condition receives the IRIG-B sign indicating number, and adjusts moment second that native system internal time maintenance module is safeguarded, makes the time basic synchronization of the time of reception and time maintenance module; Promptly receive the IRIG-B sign indicating number to the time during pulse, simultaneously the counter of internal time maintenance module is carried out zero clearing, particular value is set or the currency of counter is made a mark or pointer etc., make and restart timing.
3. after the time maintenance time dissemination system B that is in the clock out-of-lock condition received IRIG-B sign indicating number from time maintenance time dissemination system A, round-trip transmission was once in time maintenance time dissemination system A and time maintenance time dissemination system B then to make the IRIG-B sign indicating number; Write down each time maintenance time dissemination system simultaneously respectively and receive the moment and native system time maintenance module institute mark time difference constantly of IRIG-B sign indicating number, thereby obtain time-delay and t.3. step specifically is divided into:
A, be in the difference t of the moment and native system internal time maintenance module clock time of the time maintenance time dissemination system B recorder IRIG-B sign indicating number of clock out-of-lock condition
1, and difference t
1Join the time maintenance module clock and return in the control bit of IRIG-B sign indicating number, transfer to time maintenance time dissemination system A;
B, time maintenance time dissemination system A receive the IRIG-B sign indicating number, because time maintenance time dissemination system A has been in the clock tracing hold mode, so do not need to do any adjustment, the difference t of the moment of recorder IRIG-B sign indicating number and native system internal time maintenance module clock time
2, and calculate time-delay and t, i.e. t=t
1+ t
2, time-delay and t joined to prepare export in the IRIG-B sign indicating number control bit of time maintenance time dissemination system B, export the IRIG-B sign indicating number then.
4. when the IRIG-B sign indicating number in two time maintenance time dissemination systems round-trip transmission once after, promptly begin to calculate adjustment amount, and the time maintenance time dissemination system B of clock out-of-lock condition adjusted.Time maintenance time dissemination system B calculates adjustment amount T according to the time-delay and the t that obtain.In the present embodiment, because IRIG-B sign indicating number round trip in channel, so adjustment amount T is the spent time of sign in one way transmission time, in addition, adjustment amount T adopts the arithmetic mean of twice difference, i.e. T=(t
1+ t
2)/2 are adjusted the clock time among the time maintenance time dissemination system B of clock out-of-lock condition then, can obtain the time service time of high precision, pin-point accuracy.
Present embodiment as different from Example 1, in the present embodiment, the order execution of step 3. with step 4. after, continue to carry out again step 3. with step 4..
Specifically, IRIG-B sign indicating number round-trip transmission in two time maintenance time dissemination systems once records in time maintenance time dissemination system B and receives the IRIG-B sign indicating number moment and native system internal time maintenance module institute mark difference t constantly
11, in time maintenance time dissemination system A, record and receive the IRIG-B sign indicating number moment and native system internal time maintenance module institute mark difference t constantly
12, thus in step 4. the time, it is adjustment amount T for the first time
1=(t
11+ t
12)/2, and according to the adjustment amount T first time
1Time maintenance time dissemination system B to the clock losing lock does clock adjustment for the first time.
Then, round-trip transmission is once again in two time maintenance time dissemination systems to continue to allow the IRIG-B sign indicating number.At this moment, in time maintenance time dissemination system B, record the difference t that receives the passback IRIG-B sign indicating number moment and the native system internal time maintenance module institute mark moment
21, in time maintenance time dissemination system A, record and receive the IRIG-B sign indicating number moment and native system internal time maintenance module institute mark difference t constantly
22, in the second time of execution in step 4. the time, it is adjustment amount T for the second time thus
2=(t
21+ t
22)/2, and according to the adjustment amount T second time
2Time maintenance time dissemination system B to the clock losing lock does clock adjustment for the second time.Obviously, because the existence of adjusting for the first time, make T
2＜T
1This shows that before adjusting for the second time, the clock time of time maintenance time dissemination system B is accurate to some extent than the last time.
The other technologies feature is identical with embodiment 1.
In addition, it is pointed out that repeatedly execution in step 3. with step 4., promptly carry out three-wheel repeatedly, four-wheel, five is taken turns or even more, when adjustment amount less than the regulation error range the time, can show that time maintenance time dissemination system B has obtained the time service time of high precision, pin-point accuracy.
Present embodiment as different from Example 1, in the present embodiment, after 3. step carries out twice repeatedly, carry out step 4. again, be that the IRIG-B sign indicating number is in two time maintenance time dissemination systems after twice of the round-trip transmission, again according to the time-delay that obtains and, calculate adjustment amount, time maintenance time dissemination system B carried out the clock adjustment.
Specifically, IRIG-B sign indicating number twice of round-trip transmission in two time maintenance time dissemination systems: safeguard that when the time time dissemination system B receives when coming from the IRIG-B sign indicating number of time maintenance time dissemination system A, recorder IRIG-B sign indicating number constantly and native system internal time maintenance module institute mark difference t constantly
31When the IRIG-B sign indicating number transfers to time maintenance time dissemination system A, the recorder IRIG-B sign indicating number moment and native system internal time maintenance module institute mark difference t constantly in time maintenance time dissemination system A
32When the IRIG-B sign indicating number transfers to time maintenance time dissemination system B once more, the recorder IRIG-B sign indicating number moment and native system internal time maintenance module institute mark difference t constantly
33When the IRIG-B sign indicating number transfers to time maintenance time dissemination system A once more, the recorder IRIG-B sign indicating number moment and native system internal time maintenance module institute mark difference t constantly
34Like this, the IRIG-B sign indicating number is after time maintenance time dissemination system B receives, and round-trip transmission is twice in two time maintenance time dissemination systems, receive this IRIG-B sign indicating number by time maintenance time dissemination system B more at last, at this moment, begin execution in step 4., according to time-delay that obtains and calculating adjustment amount.In the present embodiment, the IRIG-B sign indicating number comes and goes twice, so adjustment amount T
3Be the spent time of sign in one way transmission time, in addition, adjustment amount T
3Adopt the arithmetic mean of four differences, i.e. T
3=(t
31+ t
32+ t
33+ t
34)/4 are adjusted the clock time among the time maintenance time dissemination system B of clock out-of-lock condition then, can obtain the time service time of high precision, pin-point accuracy.
In addition, in the present embodiment, the channel of transmitted in both directions IRIG-B sign indicating number uses optical fiber transmitting-receiving mode, and its two-way IRIG-B sign indicating number adopts direct current DC code data modulation format.
The other technologies feature is identical with embodiment 1.
It is pointed out that repeatedly the step of present embodiment in addition, after promptly 3. step carried out twice repeatedly, 4. execution in step carried out a clock adjustment; Then, after 3. step carried out twice once more repeatedly, 4. execution in step carried out the clock adjustment second time again, and three-wheel, four-wheel, five are taken turns or be even more so repeatedly.When adjustment amount less than the regulation error range the time, can show that time maintenance time dissemination system B has obtained the time service time of high precision, pin-point accuracy.
Present embodiment as different from Example 1, in the present embodiment, after 3. step carries out three times repeatedly, carry out step 4. again, be that the IRIG-B sign indicating number is in two time maintenance time dissemination systems after the round-trip transmission three times, again according to the time-delay that obtains and, calculate adjustment amount, time maintenance time dissemination system B carried out the clock adjustment.
Specifically, IRIG-B sign indicating number round-trip transmission three times in two time maintenance time dissemination systems:
1) transmission for the first time: when the time safeguards that time dissemination system B reception comes from the IRIG-B sign indicating number of time maintenance time dissemination system A, the recorder IRIG-B sign indicating number moment and native system internal time maintenance module institute mark difference t constantly
41When the IRIG-B sign indicating number transfers to time maintenance time dissemination system A, the recorder IRIG-B sign indicating number moment and native system internal time maintenance module institute mark difference t constantly in time maintenance time dissemination system A
42
2), transmission for the second time: when the IRIG-B sign indicating number transferred to time maintenance time dissemination system B once more, recorder IRIG-B sign indicating number constantly and native system internal time maintenance module institute mark difference t constantly
43When the IRIG-B sign indicating number transfers to time maintenance time dissemination system A once more, the recorder IRIG-B sign indicating number moment and native system internal time maintenance module institute mark difference t constantly
44
3), transmission for the third time: when the IRIG-B sign indicating number transferred to time maintenance time dissemination system B once more, recorder IRIG-B sign indicating number constantly and native system internal time maintenance module institute mark difference t constantly
45When the IRIG-B sign indicating number transfers to time maintenance time dissemination system A once more, the recorder IRIG-B sign indicating number moment and native system internal time maintenance module institute mark difference t constantly
46
Like this, the IRIG-B sign indicating number is after time maintenance time dissemination system B receives, and round-trip transmission is three times in two time maintenance time dissemination systems, receive this IRIG-B sign indicating number by time maintenance time dissemination system B more at last, at this moment, begin execution in step 4., according to time-delay that obtains and calculating adjustment amount.In the present embodiment, the IRIG-B sign indicating number comes and goes three times, so adjustment amount T
4Be the spent time of sign in one way transmission time, in addition, adjustment amount T
4Adopt the arithmetic mean of six differences, i.e. T
4=(t
41+ t
42+ t
43+ t
44+ t
45+ t
46)/6 are adjusted the clock time among the time maintenance time dissemination system B of clock out-of-lock condition then, can obtain the time service time of high precision, pin-point accuracy.
The other technologies feature is identical with embodiment 1.
It is pointed out that repeatedly the step of present embodiment in addition, after promptly 3. step carried out three times repeatedly, 4. execution in step carried out a clock adjustment; Then, after 3. step carried out three times once more repeatedly, 4. execution in step carried out the clock adjustment second time again, and three-wheel, four-wheel, five are taken turns or be even more so repeatedly.When adjustment amount less than the regulation error range the time, can show that time maintenance time dissemination system B has obtained the time service time of high precision, pin-point accuracy.
Though above in conjunction with the accompanying drawings the present invention has been done detailed description, the present invention is not limited to the foregoing description, in the ken that those of ordinary skills possessed, can also make many variations in claims institute restricted portion.
Claims (6)
1. method of the losing lock clock being carried out the high precision time service with two-way IRIG-B sign indicating number, it is characterized in that: this method is utilized two independently time maintenance time dissemination systems, and described time maintenance time dissemination system includes time maintenance module and IRIG-B sign indicating number transceiver module; In two described time maintenance time dissemination systems, a time maintenance time dissemination system is in the clock tracing lock-out state; Use the transmission mutually in two time maintenance time dissemination systems of two-way IRIG-B sign indicating number, write down two-way IRIG-B the sign indicating number time of reception and this internal system time maintenance module institute mark time difference constantly in each time maintenance time dissemination system respectively; Time difference according to record calculates, the time maintenance time dissemination system that is in the clock tracing lock-out state is to the spent time of sign in the time maintenance time dissemination system transmission time of clock out-of-lock condition, thereby draw adjustment amount, and then adjust the clock of the time maintenance time dissemination system that is in the clock out-of-lock condition.
2. the two-way IRIG-B sign indicating number of usefulness according to claim 1 is characterized in that to the method that the losing lock clock carries out the high precision time service it may further comprise the steps:
1. be in the time maintenance time dissemination system A output IRIG-B sign indicating number of clock tracing lock-out state, and at whole second output constantly to the time pulse;
2. the time maintenance time dissemination system B that is in the clock out-of-lock condition receives the IRIG-B sign indicating number, and adjusts moment second that native system internal time maintenance module is safeguarded, makes the time synchronized of the time of reception and time maintenance module;
3. after the time maintenance time dissemination system B that is in the clock out-of-lock condition received IRIG-B sign indicating number from time maintenance time dissemination system A, round-trip transmission was once at least in time maintenance time dissemination system A and time maintenance time dissemination system B then to make the IRIG-B sign indicating number; Write down each time maintenance time dissemination system simultaneously respectively and receive the moment and native system time maintenance module institute mark time difference constantly of IRIG-B sign indicating number, thereby obtain time-delay and t;
4. after time maintenance time dissemination system B receives the IRIG-B sign indicating number that passback comes, obtain time-delay and t simultaneously, calculate adjustment amount T, adjust the clock time among the time maintenance time dissemination system B of a clock out-of-lock condition then at least.
3. the two-way IRIG-B sign indicating number of usefulness according to claim 2 is characterized in that the method that the losing lock clock carries out the high precision time service, described step 3. in, IRIG-B sign indicating number round-trip transmission in two time maintenance time dissemination systems once may further comprise the steps:
A, be in the difference t of the moment and native system internal time maintenance module clock time of the time maintenance time dissemination system B recorder IRIG-B sign indicating number of clock out-of-lock condition
1, and difference t
1Join the time maintenance module clock and return in the control bit of IRIG-B sign indicating number, transfer to time maintenance time dissemination system A;
B, time maintenance time dissemination system A receive the IRIG-B sign indicating number, and the difference t of the moment of recorder IRIG-B sign indicating number and native system internal time maintenance module clock time
2, and calculate time-delay and t, i.e. t=t
1+ t
2, time-delay and t joined to prepare export in the IRIG-B sign indicating number control bit of time maintenance time dissemination system B, export the IRIG-B sign indicating number then.
4. the method for the losing lock clock being carried out the high precision time service according to claim 2 or the two-way IRIG-B sign indicating number of 3 described usefulness, it is characterized in that: described step 3. in, the time maintenance time dissemination system B that is in the clock out-of-lock condition receives the IRIG-B sign indicating number, and round-trip transmission is once in time maintenance time dissemination system A and time maintenance time dissemination system B then to make the IRIG-B sign indicating number; Described step 4. in, when the IRIG-B sign indicating number in two time maintenance time dissemination systems round-trip transmission once after, just the time maintenance time dissemination system B to the clock out-of-lock condition once adjusts.
5. the two-way IRIG-B sign indicating number of usefulness according to claim 4 is characterized in that the method that the losing lock clock carries out the high precision time service: described adjustment amount T is the arithmetic mean of twice difference, i.e. T=(t
1+ t
2)/2.
6. the two-way IRIG-B sign indicating number of usefulness according to claim 1 is characterized in that the method that the losing lock clock carries out the high precision time service: described IRIG-B sign indicating number adopts and exchanges AC code data modulation format.
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| CN104270219B (en) * | 2014-10-20 | 2018-10-02 | 上海东土远景工业科技有限公司 | A kind of device for analyzing IRIG-B time symbols |
| CN111277462B (en) * | 2020-01-19 | 2022-06-17 | 成都天奥电子股份有限公司 | Method for automatically measuring IRIG-B time service signal propagation delay, time service slave station and time service system |
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| US20020163466A1 (en) * | 2001-03-01 | 2002-11-07 | Lin Jin | Method and apparatus for synchronization of clocks |
| CN1759553A (en) * | 2003-01-14 | 2006-04-12 | 霍尼韦尔国际公司 | Method and apparatus for the synchronization of a system time of a communications network with a clock reference |
| CN200983085Y (en) * | 2006-11-09 | 2007-11-28 | 青岛市广播电视局 | Automatic calibration clock utilizing broadcast time reporting information for precise synchronization |
| CN101231337A (en) * | 2008-02-15 | 2008-07-30 | 哈尔滨工程大学 | High-precision time synchronizing apparatus |
-
2008
- 2008-10-24 CN CN2008102305776A patent/CN101727065B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020163466A1 (en) * | 2001-03-01 | 2002-11-07 | Lin Jin | Method and apparatus for synchronization of clocks |
| CN1759553A (en) * | 2003-01-14 | 2006-04-12 | 霍尼韦尔国际公司 | Method and apparatus for the synchronization of a system time of a communications network with a clock reference |
| CN200983085Y (en) * | 2006-11-09 | 2007-11-28 | 青岛市广播电视局 | Automatic calibration clock utilizing broadcast time reporting information for precise synchronization |
| CN101231337A (en) * | 2008-02-15 | 2008-07-30 | 哈尔滨工程大学 | High-precision time synchronizing apparatus |
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