CN101043317A - Method for testing precision of time synchronism equipment and its system - Google Patents
Method for testing precision of time synchronism equipment and its system Download PDFInfo
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- CN101043317A CN101043317A CN 200610061060 CN200610061060A CN101043317A CN 101043317 A CN101043317 A CN 101043317A CN 200610061060 CN200610061060 CN 200610061060 CN 200610061060 A CN200610061060 A CN 200610061060A CN 101043317 A CN101043317 A CN 101043317A
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Abstract
The invention discloses a time synchronization device accuracy measuring system and method, the system includes time synchronization device, time service device, measuring device and NTP converter, the time synchronization device and the time service device are connected with the measuring device separately, and the NTP converter are connected with the time synchronization device and the measuring device, the method also includes following steps: 1. the time synchronization device sends the NTP signal to the NTP converter; 2. the NTP converter converts the NTP signal received by the time synchronization device into the DCLS signal; 3. the time sever outputs the DCLS signal, the DCLS signal output by the time sever is as the basis, the measuring device compares the DCLS signal output by the time sever and the DCLS signal output by the NTP converter. The invention converts the NTP signal into the DCLS signal to measure and improves the measuring accuracy.
Description
Technical field
The present invention relates to the time synchronized field, relate in particular to a kind of method for testing precision of time synchronism equipment and device thereof.
Background technology
Accurately, reliably the time has a wide range of applications in fields such as satellite, communication and space flight, use for some, ten thousand/second error also can cause and have a strong impact on.The charge system that is used for communication network can reduce the mistake of charge information, and the foundation of the inter-network settlement of different operators is provided.The final time source of time synchronized is GPS (Global Position System) (as GPS), obtain the standard time from time source after, temporal information need be sent on the various equipment that need time synchronized by interoffice/intra-office time distribute links.Time signal form commonly used at present mainly contains two kinds: and timing code and NTP (Network Time Protocol) (NetworkTime Protocol, NTP).Timing code have range time group Type B form (Inter RangeInstrumentation Group-B, IRIG-B), DC level carry sign indicating number (DC Level Shift, DCLS), serial port ascii string etc.
IRIG-B adopts the sine wave of 1KHz to carry out amplitude modulation(PAM) as carrier frequency, and nearest 1 second is encoded, have in comprising in the frame of IRIG-B the sky, the time, minute, second and control information etc., transmission medium can be used twisted-pair feeder (1.2km) and coaxial cable.
DCLS carries code element information with DC potential, is the envelope of IRIG modulation code, and its code stream figure can be as shown in Figure 2.DCLS the time frame period be 1s, 100 code elements of per second are the pulsewidth coding mode, the repetition rate of code element is 100Hz.Two adjacent code element forward positions are spaced apart index count at interval, and width is 10ms, and code element has three kinds, and the pulsewidth of location recognition sign is 8ms, and the pulsewidth of binary one and " 0 " is respectively 5ms and 2ms.The on-time point that the forward position of second 8ms pulse in continuous two 8ms broad pulses is second, since second 8ms, be respectively the 0th, 1,2 ..., 99 code elements.Contain in the time format frame second, branch, the time, information such as sky, these all represent information with binary-coded decimal, low level is preceding, high-order after, individual position is preceding, ten after.
NTP is used in standard the Internet (Internet) agreement that the reliable time is provided in the network, based on user datagram protocol message, uses 123 ports.NTP is the mode of present comparative maturity, as long as a perfect data communication network (as IP network) is arranged, equipment or subordinate's server can reach to the network of higher level's server, just can realize the transmission of temporal information, realizes the NTP time synchronized.
Time server and often obtained by the measurement of time synchronized index by the quality of synchronous client net synchronization capability.IRIG-B, DCLS and serial port ASCII etc. can test out more accurately by oscilloscope or other testers.At present, in all time interface, NTP is to use the most a kind of, but NTP is a NTP (Network Time Protocol), general not Easy Test of instrument, the particularly key so the height of its measuring accuracy just seems.
The accuracy test principle of time synchronism equipment as shown in Figure 1.Time server adopts gps signal as time source, and its output NTP signal is as the benchmark of test.Test client is acquisition time information on time server and the time synchronism equipment successively, calculate test client and both deviation delta T01 and Δ T02 then, so just can calculate the acquisition time synchronism equipment and carve the precision Δ T12=Δ T01-Δ T02 of output at this moment.
The shortcoming of this scheme: though the NTP that adopts the time server output dispose gps satellite as test benchmark, because precision of NTP output itself can only arrive 100 μ s levels, has brought the error of 100 μ s levels or ms level to the test of time.In addition, test client obtains clock from time synchronism equipment and time server, influence owing to factors such as time drift that has uncertain network delay, client itself and computational accuracies, the precision of the time synchronism equipment that tests out is affected greatly, and Ce Shi precision generally can only reach several ms levels like this.Especially, when the precision of the NTP of synchronizer output during at several 100 μ s, this kind testing scheme can't test out the true precision of synchronizer output NTP.
Therefore, be necessary prior art is improved to adapt to the needs of practical application.
Summary of the invention
The object of the present invention is to provide high precision of time synchronism equipment test macro of a kind of measuring accuracy and ten thousand methods.
For achieving the above object, the present invention adopts following technical scheme: a kind of precision of time synchronism equipment test macro, comprise time synchronism equipment, time server, tester and NTP transducer, time synchronism equipment links to each other with tester respectively with time server, connect between time synchronism equipment and the tester NTP (Network Time Protocol) NTP transducer is arranged, the NTP conversion of signals that this NTP transducer will receive from time synchronism equipment is the DCLS signal, described time server output DCLS signal, described tester with the DCLS signal of time server output as test benchmark, to the test of comparing of the DCLS signal of the DCLS signal of time server output and the output of NTP transducer.
Described NTP transducer comprises time receiver, time synthesizer, DCLS maker, frequency multiplier and oscillator, and described time receiver realizes that in CPU described time synthesizer and DCLS maker are realized in logical device.Described time server is a global satellite system GPS receiver.Described tester adopts twin-channel oscilloscope.
A kind of method for testing precision of time synchronism equipment may further comprise the steps: A, time synchronism equipment are to NTP transducer output NTP signal; The NTP conversion of signals that B, NTP transducer will receive from time synchronism equipment is the DCLS signal; C, time server output DCLS signal, tester with the DCLS signal of time server output as test benchmark, to the test of comparing of the DCLS signal of the DCLS signal of time server output and the output of NTP transducer.
Described NTP transducer comprises time receiver, time synthesizer, DCLS maker, frequency multiplier and oscillator, and wherein, the time receiver is finished the processing of Network Time Protocol processing and temporal information; The time synthesizer produces signless 64 bps timecode informations; Oscillator is to time synthesizer and frequency multiplier output frequency signal; Export to the DCLS maker after the frequency frequency multiplication of frequency multiplier with oscillator output; The DCLS maker utilizes from the frequency multiplication frequency information of frequency multiplier reception with from the 64 bps timecode informations that the time synthesizer receives and forms the DCLS signal.
The NTP signal of described time receiver time of reception synchronizer output obtains the temporal information of equipment, and obtains local time information from the time synthesizer, to obtain the time deviation of local time information and time synchronism equipment.
Described time synthesizer utilizes frequency information and the synthetic signless 64 bps timecode informations of local time information that receive from oscillator.The frequency signal that described time synthesizer utilization receives from oscillator does not stop refreshes local time information, simultaneously the time deviation that obtains according to the time receiver 64 bps timecode informations that come real-time fine setting time synthesizer to generate.
The frequency multiplication frequency information that described DCLS maker receives frequency multiplier output generates a pulse 1PPS of per second signal, utilizes the 1PPS signal again and forms the DCLS signal from the 64 bps timecode informations that the time synthesizer receives.
Beneficial effect of the present invention is as follows: will become the DCLS signal from the NTP conversion of signals that time synchronism equipment receives by the NTP transducer, the DCLS signal of telecommunication that adopts the output of GPS receiver is as test benchmark, tester is to the test of comparing of the DCLS signal of the DCLS signal of GPS receiver output and the output of NTP transducer, wherein the precision of the DCLS signal of GPS receiver output can reach the 100ns level, the measuring accuracy of tester also can reach the ns level, so the test error that test benchmark and tester bring can be ignored; On the other hand, the test of the NTP signal of the NTP signal of GPS receiver output and the output of NTP transducer being compared in the prior art, the NTP signal accuracy ms level of test output, best can only reach 100 μ s levels, and the present invention has improved the precision of NTP test greatly.
In addition, time receiver in the NTP transducer is realized in CPU, time synthesizer and DCLS maker are realized in logical device, be in the implementation procedure of DCLS signal promptly in the NTP conversion of signals, in logical device, generate DCLS signal and PPS signal, the burden of the CPU that significantly reduces has guaranteed the accuracy of the DCLS signal of output simultaneously.
Description of drawings
Fig. 1 is the test schematic diagram of prior art time synchronism equipment.
Fig. 2 is DCLS code stream figure.
Fig. 3 is the test schematic diagram of time synchronism equipment of the present invention.
Fig. 4 is the schematic diagram of NTP transducer of the present invention.
Fig. 5 is the schematic diagram that DCLS signal of the present invention forms.
Fig. 6 is the schematic diagram that time deviation forms in the test process of the present invention.
Embodiment
Precision of time synchronism equipment test macro of the present invention comprises time synchronism equipment, time server, tester and NTP transducer, time server links to each other with tester, time synchronism equipment links to each other with tester by the NTP transducer, can be based on the implementation procedure that the precision of time synchronism equipment of above-mentioned framework is tested referring to shown in Figure 3, time synchronism equipment output NTP network signal, the NTP network signal converts the DCLS signal of telecommunication to by the NTP transducer, the DCLS signal of telecommunication that adopts the output of GPS receiver is as test benchmark, and tester is to the test of comparing of the DCLS signal of the DCLS signal of GPS receiver output and the output of NTP transducer.
The NTP transducer comprises time receiver, time synthesizer, DCLS maker, frequency multiplier and oscillator as shown in Figure 4.
The time receiver is realized in CPU, is responsible for communicating with synchronizer, finishes the processing of Network Time Protocol processing and temporal information.The time receiver obtains the temporal information of equipment from the NTP signal of time synchronism equipment output by network interface, obtain local time information from the time synthesizer simultaneously, adopt the canonical algorithm of NTP can obtain the transmission delay of network then, and adopt the shake of the method filtering time of software filter.By compensation of delay with eliminate shake, obtain the time deviation of the local time information and the time synchronism equipment of high accuracy at last, the method for the canonical algorithm of NTP and software filter field known techniques for this reason wherein is not so give unnecessary details at this.For the accuracy of time of improving the acquisition time synchronizer as much as possible, between NTP transducer and time synchronism equipment, adopt crossover network cables to carry out point-to-point communication.
The time synthesizer is realized in logical device, is responsible for producing 64 bps timing codes.Logical device can adopt programmable logic device (EPLD) or field programmable gate array (FPGA).64 bps timing codes begin to describe when January 1 1900 Christian era is zero, and preceding 32 is integer part, and back 32 is fractional part, and Ji Shuo precision can reach 2 in theory
-32Second.The count pulse of logic comes the clock of oscillator output.When equipment is started working, write absolute temporal information by the time receiver.Receiver received behind the NTP signal of time synchronism equipment output at that time, by the mode of adjusting or adjusting backward forward, adjusted the time in the time synthesizer, and the precision of adjusting can reach 2
-32Second.
The DCLS maker realizes that in logical device (EPLD or FPGA) its function is to produce the DCLS signal, can produce 1PPS signal (pulse of per second) simultaneously.As shown in Figure 5, the time synthesizer has produced 64 bps timecode informations, with position T[0 second] export to the DCLS maker.T[0] owing to be a second position, simultaneously owing to be binary system, so T[0] waveform be the signal of 0.5Hz, utilize the high frequency clock of frequency multiplier output to detect T[0] rising edge and trailing edge can form the 1PPS signal, utilize the temporal information in 1PPS signal and the time synthesizer again, can form the DCLS signal.
Oscillator is to time synthesizer and frequency multiplier output frequency signal, and in the present invention, oscillator adopts thermostatic control crystal oscillation device, and this crystal oscillator clock accuracy is 10E
-8Magnitude, ageing rate is generally 5*10
-10/ day has the precision height, shakes little characteristics.
Frequency multiplier adopts special frequency doubling device, and the frequency frequency multiplication that oscillator is exported arrives higher frequency.The frequency of frequency multiplication is high more, and the resolution of time synthesizer is high more, and the precision of generated time sign indicating number is also just high more, and the precision that generates DCLS and 1PPS is also just high more.
Framework in conjunction with above-mentioned NTP transducer, the NTP signal is as follows by the process that the NTP transducer converts the DCLS signal to: the time receiver receives the temporal information that the NTP signal obtains equipment by network interface, obtain local time information from the time synthesizer simultaneously, obtain the time deviation of local time information and time synchronism equipment at last; Oscillator is to time synthesizer and frequency multiplier output frequency signal; The time synthesizer utilizes frequency signal and the synthetic signless 64 bps timecode informations of local time information, the temporal information that refreshes self that the time synthesizer does not stop with frequency signal, the time deviation that obtains according to the time receiver is come 64 bps timecode informations of real-time fine setting time synthesizer generation simultaneously; Frequency multiplier is exported to the DCLS maker with the frequency frequency multiplication of oscillator output to higher frequency, and the DCLS maker utilizes this high frequency to form the 1PPS signal, utilizes the temporal information in 1PPS signal and the time synthesizer again, can form the DCLS signal.
Test process is that DCLS signal with time server output is as test benchmark, to the test of comparing of the DCLS signal of the DCLS signal of GPS receiver output and the output of NTP transducer, tester of the present invention adopts twin-channel oscilloscope by tester.Oscilloscope adopts rising edge to trigger, and the triggering source is the DCLS signal of GPS receiver output.Oscillographic demonstration is adjusted near the forward position of second 8ms in continuous two 8ms broad pulses, as shown in Figure 6, can test out two time deviation t (ns) between the DCLS, simultaneously, the deviation that oscilloscope can be read the temporal information (time, minute, second) of two continuous 8ms back is T second, like this, the deviation that can test out the time synchronism equipment output time is: T-t.
The precision of the DCLS signal of GPS receiver output can reach the 100ns rank, and the measuring accuracy of tester also can reach the ns rank, so the test error that test benchmark and tester bring can be ignored, has improved the precision of NTP test greatly.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1, a kind of precision of time synchronism equipment test macro, comprise time synchronism equipment, time server and tester, time synchronism equipment links to each other with tester respectively with time server, it is characterized in that: also be connected with NTP (Network Time Protocol) NTP transducer between described time synchronism equipment and the tester, the NTP conversion of signals that this NTP transducer will receive from time synchronism equipment is that DC level is carried a yard DCLS signal, described time server output DCLS signal, described tester with the DCLS signal of time server output as test benchmark, to the test of comparing of the DCLS signal of the DCLS signal of time server output and the output of NTP transducer.
2, precision of time synchronism equipment test macro according to claim 1, it is characterized in that: described NTP transducer comprises time receiver, time synthesizer, DCLS maker, oscillator and frequency multiplier, described time receiver realizes that in CPU described time synthesizer and DCLS maker are realized in logical device.
3, precision of time synchronism equipment test macro according to claim 1 is characterized in that: described time server is a global satellite system GPS receiver.
4, precision of time synchronism equipment test macro according to claim 1, it is characterized in that: described tester adopts twin-channel oscilloscope.
5, a kind of method for testing precision of time synchronism equipment is characterized in that, may further comprise the steps:
S1, time synchronism equipment are to NTP transducer output NTP signal;
The NTP conversion of signals that S2, NTP transducer will receive from time synchronism equipment is the DCLS signal;
S3, time server output DCLS signal, tester with the DCLS signal of time server output as test benchmark, to the test of comparing of the DCLS signal of the DCLS signal of time server output and the output of NTP transducer.
6, method for testing precision of time synchronism equipment according to claim 5 is characterized in that: described NTP transducer comprises time receiver, time synthesizer, DCLS maker, frequency multiplier and oscillator, wherein,
The time receiver is finished the processing of Network Time Protocol processing and temporal information;
The time synthesizer produces signless 64 bps timecode informations;
Oscillator is to time synthesizer and frequency multiplier output frequency signal;
Export to the DCLS maker after the frequency frequency multiplication of frequency multiplier with oscillator output;
The DCLS maker utilizes from the frequency multiplication frequency information of frequency multiplier reception with from the 64 bps timecode informations that the time synthesizer receives and forms the DCLS signal.
7, method for testing precision of time synchronism equipment according to claim 6, it is characterized in that: the NTP signal of described time receiver time of reception synchronizer output obtains the temporal information of equipment, and obtain local time information from the time synthesizer, to obtain the time deviation of local time information and time synchronism equipment.
8, method for testing precision of time synchronism equipment according to claim 7 is characterized in that: described time synthesizer utilizes frequency information and the synthetic signless 64 bps timecode informations of local time information that receive from oscillator.
9, method for testing precision of time synchronism equipment according to claim 8, it is characterized in that: the frequency signal that described time synthesizer utilization receives from oscillator does not stop refreshes local time information, simultaneously the time deviation that obtains according to the time receiver 64 bps timecode informations that come real-time fine setting time synthesizer to generate.
10, method for testing precision of time synchronism equipment according to claim 6, it is characterized in that: the frequency multiplication frequency information that described DCLS maker receives frequency multiplier output generates a pulse 1PPS of per second signal, utilizes the 1PPS signal again and forms the DCLS signal from the 64 bps timecode informations that the time synthesizer receives.
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| CN101419279B (en) * | 2008-12-05 | 2011-05-04 | 中国电子科技集团公司第十四研究所 | Doppler radar multi-receiver station synchronizer |
| CN102593955A (en) * | 2012-03-05 | 2012-07-18 | 广西电网公司电力科学研究院 | Comprehensive intelligent time frequency testing system and testing method |
| CN102590619A (en) * | 2012-03-14 | 2012-07-18 | 湖北省电力公司电力试验研究院 | Method for detecting time synchronization capacity of real-time measurement equipment based on timing variable |
| CN102590612A (en) * | 2012-03-05 | 2012-07-18 | 广西电网公司电力科学研究院 | Intelligent time frequency signal switcher |
| CN102591194A (en) * | 2012-03-06 | 2012-07-18 | 广西电网公司电力科学研究院 | Intelligent test system and method used for IRIG (Inter-range Instrumentation Group)-B code fault-tolerant function of time synchronizer |
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| CN106452561A (en) * | 2016-09-27 | 2017-02-22 | 北京无线电计量测试研究所 | Satellite bidirectional time alignment system among multiple stations |
| CN107608832A (en) * | 2017-09-20 | 2018-01-19 | 联想(北京)有限公司 | Information processing method and electronic equipment |
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| CN101419279B (en) * | 2008-12-05 | 2011-05-04 | 中国电子科技集团公司第十四研究所 | Doppler radar multi-receiver station synchronizer |
| CN103210656B (en) * | 2011-03-09 | 2016-08-17 | 日立麦克赛尔株式会社 | Image dispensing device, image sending method, video receiver and image method of reseptance |
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| CN102593955A (en) * | 2012-03-05 | 2012-07-18 | 广西电网公司电力科学研究院 | Comprehensive intelligent time frequency testing system and testing method |
| CN102590612A (en) * | 2012-03-05 | 2012-07-18 | 广西电网公司电力科学研究院 | Intelligent time frequency signal switcher |
| CN102590612B (en) * | 2012-03-05 | 2013-12-04 | 广西电网公司电力科学研究院 | Intelligent time frequency signal switcher |
| CN102593955B (en) * | 2012-03-05 | 2014-01-01 | 广西电网公司电力科学研究院 | Comprehensive intelligent time frequency testing system and testing method |
| CN102591194A (en) * | 2012-03-06 | 2012-07-18 | 广西电网公司电力科学研究院 | Intelligent test system and method used for IRIG (Inter-range Instrumentation Group)-B code fault-tolerant function of time synchronizer |
| CN102591194B (en) * | 2012-03-06 | 2013-06-19 | 广西电网公司电力科学研究院 | Intelligent test system and method used for IRIG (Inter-range Instrumentation Group)-B code fault-tolerant function of time synchronizer |
| CN102590619A (en) * | 2012-03-14 | 2012-07-18 | 湖北省电力公司电力试验研究院 | Method for detecting time synchronization capacity of real-time measurement equipment based on timing variable |
| WO2013135069A1 (en) * | 2012-03-14 | 2013-09-19 | 湖北省电力公司电力科学研究院 | Timing variable based method for detecting time synchronization capability of real-time measurement device |
| US9257039B2 (en) | 2012-03-14 | 2016-02-09 | State Grid Corporation Of China | Method for detecting time synchronization ability of real-time measuring device based on time variable |
| CN104935394A (en) * | 2015-06-26 | 2015-09-23 | 上海市计量测试技术研究院 | Time signal generator and time tester |
| CN109074723A (en) * | 2016-04-14 | 2018-12-21 | 日本电信电话株式会社 | Method for synchronizing time, sensor insertion terminal and sensor network system |
| US10862602B2 (en) | 2016-04-14 | 2020-12-08 | Nippon Telegraph And Telephone Corporation | Time synchronization method, sensor data acquisition terminal, and sensor network system |
| CN106452561A (en) * | 2016-09-27 | 2017-02-22 | 北京无线电计量测试研究所 | Satellite bidirectional time alignment system among multiple stations |
| CN106452561B (en) * | 2016-09-27 | 2019-12-13 | 北京无线电计量测试研究所 | system and method for comparing satellite bidirectional time among multiple stations |
| JP2018078351A (en) * | 2016-11-07 | 2018-05-17 | 株式会社明電舎 | Measuring method of time precision |
| CN107608832A (en) * | 2017-09-20 | 2018-01-19 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN112333051A (en) * | 2021-01-04 | 2021-02-05 | 北京创世云科技有限公司 | Unidirectional network delay determination method and device and electronic equipment |
| CN112333051B (en) * | 2021-01-04 | 2021-04-02 | 北京创世云科技股份有限公司 | Unidirectional network delay determination method and device and electronic equipment |
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