CN105911858A - Subnanosecond grade remote time comparing/transmitting system error testing method - Google Patents
Subnanosecond grade remote time comparing/transmitting system error testing method Download PDFInfo
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- CN105911858A CN105911858A CN201610220572.XA CN201610220572A CN105911858A CN 105911858 A CN105911858 A CN 105911858A CN 201610220572 A CN201610220572 A CN 201610220572A CN 105911858 A CN105911858 A CN 105911858A
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
- G04R20/04—Tuning or receiving; Circuits therefor
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R40/00—Correcting the clock frequency
- G04R40/04—Correcting the clock frequency by detecting the radio signal frequency
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Abstract
The invention provides a subnanosecond grade remote time comparing/transmitting system error testing method. A transportable bidirectional moving calibration station is used and is mounted in such a way that the calibration station and a system being tested share the same address, time difference of clock signals at two places is measured, system deviation of remote time measurement of the system being tested is obtained and is regarded as a system error of the system. Via use of the subnanosecond grade remote time comparing/transmitting system error testing method, accuracy of a remote time comparing system can be improved, and clock comparison and synchronization precision of satellite bi-direction or common view methods for comparing and synchronizing clocks at different places can be improved.
Description
Technical field
The present invention relates to a kind of remote time comparison/transmission system error testing method.
Background technology
The usually said time is made up of moment and time interval two parts, and basic time, the unit at interval was the second, and the moment is to be consulted to determine by international uniform, and the two is inseparable.According to timing definition, the atomic clock of independent operating, even if there being second interval the most accurately, because the moment amount the most corresponding with the reference standard time, the time can not be produced.In order to unify the global time, various countries are coordinated by CIPM, it is stipulated that Coordinated Universal Time(UTC) UTC is the most unified appointed time, and define second interval and moment.International Bureau of Wieghts and Measurements (BIPM) is responsible for and sets up international time frequency reference, frequency time signal can be in the special nature of worldwide transmission, making it need progressive unlike other transmission of quantity value, this is also for creating condition unified time in worldwide.The Time and frequency standard of various countries passes through remote time, frequency ratio pair, keeps Tong Bu with it, so that various countries' time keeps concordance.
nullAlong with every profession and trade is more and more higher to time unification required precision，Nanosecond the most high-precision time synchronized demand is increasingly becoming development trend，For this kind of demand，Two-way satellite time and frequency transfer method is had been developed at present、Satellite common visions etc. can realize the method for several nanosecond remote time comparison accuracy，But this kind of method tested person mounting condition、Test instrunment volume is bigger、The reasons such as test sustainable requests limit，It is difficult to the systematic error of Accurate Calibration test system，Cause time difference test result between remote clock is existed the system deviation determined，And changed slowly by instrument self time-delay and affected，This system deviation on-fixed value，There are some researches show，The systematic error of satellite two-way pumping station system has changed about 7ns between 7 years，And the change direction of systematic error is random，It is difficult to be compensated by rule known to certain.
The main time service means of table 1 and performance summary sheet thereof
As seen from the above table, various time service means cover different accuracy time frequency signal demand, wherein for nsec comparison method, in order to ensure the precision of comparison result, need to cause the project of systematic error to be calibrated equipment delay etc., the method such as including navigation system time service, satellite common vision, satellite two-way pumping station, optical fiber time Frequency Transfer, comparison specification all advises answering the systematic error of periodic calibration Compare System.
According to test specification requirement, the systematic error of system under test (SUT) is calibrated and needs to use equipment or the system with higher measurement criteria, usually require that and exceed system under test (SUT) precision property three times or even an order of magnitude is just enough to out objective test result.At present, considering the various objective condition such as equipment availability, expenditure cost, performance need, different remote time Compare Systems has different measuring method, to measure equipment Alignment systematic error available, mainly has a following two method:
1) movement station method
Systematic error such as satellite common vision, satellite two-way pumping station is mainly derived from equipment delay, therefore the main method used is to use mobile device P, zero base line clock test altogether is carried out respectively with two device A and B participating in comparison, record the A equipment delay relative to P respectively, and the relative device time delay that B is relative to P, it is then assumed that the time delay of P equipment is fixed value during two sections of tests, two groups of test results are used to subtract each other, offset the delay volume of mobile device P, thus obtain the relative time delay of two equipment of A and B.This method is the most conventional, advantage is mobile device convenient in carrying, testing cost mainly transport and time, shortcoming is that different Compare Systems needs different types of mobile device, versatility is the strongest, and by equipment carrying, dismounting, equipment delay is affected, it is impossible to ensureing that the mobile station apparatus time delay of test every time immobilizes, therefore uncertainty of measurement is at nanosecond order.
2) simulator method
Simulator method is to use signal simulator analogue signal, the absolute time delay of test equipment.Simulator method need buy signal simulator, nonrecurring cost put into higher, for be positioned at strange land remote time comparison equipment in-convenience in use, the inapplicable remote time Compare System needing periodic calibration, be usually used in original equipment time-delay calibration occasion.
The uncertainty of mobile reference station method calibrator (-ter) unit time delay is to nanosecond order, the inapplicable periodic calibration of simulator method, and it should be noted that, either move reference station method or simulator method, the main target of test is equipment delay, equipment delay is the remote time frequency ratio main source to service system error, is likely present the asymmetric impact waiting delay volume of signal space propagation path, and only calibrator (-ter) unit time delay can not meet systematic error calibration requirements.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention provides a kind of subnanosecond level remote time comparison/transmission system error calibrating method, the systematic error calibration accuracy to remote time frequency Compare System can be improved, meet the systematic error calibration requirements of different remote comparison system, remote time comparison accuracy reaches nanosecond, is applicable to the systematic error test of the remote time comparison/transmission systems such as satellite common vision, satellite be two-way.
The technical solution adopted for the present invention to solve the technical problems comprises the following steps:
Step one, stands at tested A, is put together by the two identical way moving calibrator (-ter) units of set, provides reference with the reference time of tested A station remote time Compare System for two set way moving calibrator (-ter) units；Two set way moving calibrator (-ter) units send out receipts mutually mutually by satellite, carry out zero base line comparison, and comparison result T1 is two set way moving calibrator (-ter) units and stands the relative time delay under environment at tested A；
Step 2, any a set of way moving calibrator (-ter) unit is moved to tested B station, the reference time using tested B station remote time Compare System is reference, two-way temporal frequency relays link is set up by the way moving calibrator (-ter) unit of satellite with tested A station, carry out the test of the two places time difference, result T2 recorded comprises tested A, B two the station remote time Compare System reference time clock correction and two sets mobile calibrator (-ter) unit relative time delay；
Step 3, stands at tested B, is put together by two set way moving calibrator (-ter) units, provides reference with the reference time of tested B station remote time Compare System for two set way moving calibrator (-ter) units；Receipts mutually are sent out in way moving calibration mutually by satellite, carry out zero base line comparison, and comparison result T3 is two set way moving calibrator (-ter) units relative time delays under the environment of tested B station；
Step 4, calculates the average of T1 and T3, as the relative time delay of two set way moving calibrator (-ter) units self；
Step 5, the relative time delay of two set way moving calibrator (-ter) units self is deducted in T2, obtain tested A, B two clock correction true value of reference time of station remote time Compare System, with tested A, B two the actually measured clock correction of station remote time Compare System subtract each other, obtain system under test (SUT) and measure the systematic error of remote time, be used for calibrating this remote time and measure system.
Described way moving calibration station includes radio-frequency transmissions and receives unit, baseband processing unit, time-interval-unit, data acquisition and procession unit.
Described radio-frequency transmissions with receive 10MHz that unit exports with tested remote time Compare System homology as reference, by baseband processing unit produce 70MHz signal up-conversion and amplify, through duplexer and sky alignment satellite launch, receive the outer station signal of satellite downlink simultaneously, after low noise is amplified, it is down-converted to 70MHz, delivers to baseband processing unit；While satellite emission signal, couple a part of signal from Antenna aperture, after tested after transponder down coversion, measure for baseband processing unit, equipment delay is calibrated；
Described baseband processing unit includes launch terminal and receives terminal, and launch terminal produces ranging code and modulated signal according to the reference time signal at A station or B station, modulates the signal to 70MHz intermediate frequency；Receive terminal and receive downward signal of satellite and the signal from Antenna aperture coupling, measure pseudorange, measurement result is delivered data acquisition and procession unit；
Described time-interval-unit measures the time difference of the reference time signal 1pps signal that produce internal with baseband processing unit at A station or B station, will deliver data acquisition and procession unit the time difference；
The outer station measurement result that the pseudorange that baseband processing unit is measured by described data acquisition and procession unit obtains with demodulation is analyzed, and the measurement result of binding time interval measurement unit is calculated the systematic error result of system under test (SUT).
The invention has the beneficial effects as follows:
The clock signal utilizing same place can be allocated multiple signal, and height correlation between each signal, there is the attribute determining phase relation, use a set of way moving calibration station moved, install with system under test (SUT) location, measure the time difference of two places clock signal simultaneously, on the basis of high-precision calibration its own system error, record the true value of the two places clock signal time difference, the two places clock signal time difference value recorded with this result calibration system under test (SUT), thus obtain system under test (SUT) and measure the system deviation of remote time, it is the systematic error of this system.
The main contributions of the present invention be the systematic error of calibration remote time Compare System within 0.5ns, improve the accuracy of remote time Compare System, improve the strange land clock ratio of two-way based on satellite or common vision method to, synchronization accuracy.
Accompanying drawing explanation
Fig. 1 is TWSTFT fundamental diagram；
Fig. 2 is single set way moving calibrator (-ter) unit composition schematic diagram；
Fig. 3 is the method flow diagram of the present invention；
Fig. 4 is equipment its own system error calibration fundamental diagram before test；
Fig. 5 is systematic error test philosophy figure；
Fig. 6 is equipment its own system error calibration fundamental diagram after test.
Detailed description of the invention
The present invention is further described with embodiment below in conjunction with the accompanying drawings, and the present invention includes but are not limited to following embodiment.
The present invention can solve the problem that the problem that the systematic error of remote Time transfer receiver/transmission system is difficult to high-precision calibration, by using two to overlap the Two Way Satellite Time Transfer that can move to equipment, the systematic error of tested remote Time transfer receiver/transmission system is calibrated to magnitude of subnanosecond, reduces the systematic error of remote time comparison/transmission system.
Present invention mainly solves the key issue of two aspects:
(1) calibration of calibrator (-ter) unit its own system error
For calibrating the equipment of other system, it is necessary first to energy accurate alignment self systematic error in testing, could be used for calibrating other remote time Compare System.
The present invention solves system error self-calibration problem by using two kinds of means: one is to devise analogue repeater at device interior, during test, signal forms the loop launched voluntarily, receive at device interior, monitors the change of equipment self time-delay in real time, for compensating test result；Two is the equipment that equipment is designed as carrying detachable, convenient, design also takes into account simultaneously repeatedly dismantle, equipment delay keeps stable when installing equipment, the Two Way Satellite Time Transfer that other two sets can be moved is identical to equipment, including each comprising modules, cable length, connecter type, device batch etc., to guarantee that two complete equipments have similar Delay Variation attribute.Utilize the attribute moved of two complete equipments, it is installed in same place, identical clock source is used to drive, zero base line clock method altogether is i.e. used to measure the systematic error of system self, same Zhong Yuan is ideally used to drive, the clock correction result of null value should be recorded, actual measured results is affected by measurement system error, measured result is the system deviation of measurement system, in short time (within a couple of days), equipment delay converted quantity is much smaller than 0.5ns, can be considered constant value, in the measurements the systematic error of calibrator (-ter) unit self.
(2) systematic error of high-precision calibration system under test (SUT)
On the basis of to its own system error high-precision calibration, calibrator (-ter) unit is used for the systematic error of high-precision calibration system under test (SUT), it is desirable to the remote time matching measurement precision of calibration system, higher than system under test (SUT), just can ensure that the credibility of calibration result.
The two-way satellite time and frequency transfer (TWSTFT) forwarded based on GEO satellite is the main method generally acknowledged at present and realize distant-range high-precision Time transfer receiver, for between each atomic frequency standard, the punctual time of laboratory monitoring, frequency ratio pair, and for if satellite navigation system etc. is containing multiple chronometer time unit, and it is distributed in different geographical position, need the occasion of precise synchronization.The chain-circuit time delay calibration uncertainty of TWSTFT is about 1ns, and this is also the comparison accuracy level that current the method can realize.Chain-circuit time delay can be divided into equipment delay and spatial transmission time delay two class by propagation medium difference, wherein equipment delay is mainly derived from ground installation and satellite equipment, equipment delay non-constant value, and it is in close relations with environmental condition, additionally affected by device aging, equipment delay there is also random slow variation characteristic, causes equipment delay to be difficult to accurate calibration.Compared with equipment delay, the time delay source in signal space propagation is more complicated, environment is changeable, mainly includes ionosphere, troposphere, satellite motion, Sagnac effect etc., it is difficult to by accurate calibration.The present invention proposes a kind of based on two-way satellite time and frequency transfer principle, the Two Way Satellite Time Transfer using two sets to move includes satellite two-way pumping station system to equipment (being called for short: way moving calibration station) calibration, the method of the systematic error of the remote time Compare Systems such as satellite common vision Compare System, the systematic error of system under test (SUT) (can be included equipment delay, signal space propagation delay) demarcate magnitude of subnanosecond, calibration uncertainty is less than 0.5ns, this index comparison uncertainty also above the two-way 1ns of current satellite, the comparison uncertainty of satellite common vision 5ns, meet the requirement calibrating its systematic error.
The basic functional principle of satellite two-way time transfer is as it is shown in figure 1, the measurement equipment laying respectively at two stations is measured the our station time and forwards, from the difference of the time signal of remote station through satellite simultaneously.As at website 1, time difference result TW (1,2) that enumerator records, it is that website 1 is when receiving from website 2 signal, record website 2 and launch the difference in signal moment and website 1 reference signal, meanwhile, at the measurement equipment of website 2, record time difference result TW (2,1), due to two places, to record signal transmission path contained by result identical, and two places exchange test data, offset co-route time delay influence, the difference of two places time can be obtained.
But in actual application, due to signal transmission path non complete symmetry, time delay not exclusively can be cancelled, therefore, the two-way comparison accuracy that realizes of satellite is about 1ns, and main error source is that two complete equipment time delays etc. are not completely equivalent and cause measurement result to there is system deviation, it is difficult to accurately calibration causes.
A kind of subnanosecond level remote time comparison/transmission system error calibrating method that the present invention proposes, it is based on satellite two-way time transfer ultimate principle, use the systematic error of way moving calibration station test remote time Compare System, way moving calibration station design focal point be portable, dismounting is assembled quick, convenient to star, repeatedly dismounting antenna performance unaffected, particularly delay stability of time requires height, it is desirable to is the repeated removal of system own, installs the Delay Variation caused less than 0.1ns.
Way moving calibration station is made up of two complete equipments, and the configuration of every complete equipment is as shown in Figure 2.Equipment is made up of four parts, radio-frequency transmissions and reception unit, baseband processing unit, time-interval-unit, data acquisition and procession unit.
Radio-frequency transmissions with receive 10MHz that unit exports with the frequency source of system homology to be calibrated as reference, by baseband transmission terminal produce 70MHz signal up-conversion and amplify, to satellite launch, receive the outer station signal of satellite downlink simultaneously, it is down-converted to 70MHz, delivers to Baseband Receiver terminal.While satellite emission signal, couple a part of signal from Antenna aperture, again deliver to radio frequency reception channel after transponder down coversion after tested, for base band, equipment delay is calibrated.
Baseband processing unit includes launch terminal and receives terminal, and launch terminal produces ranging code and modulated signal according to the 1pps signal (A station or the reference time signal at B station) that outside is to be measured, modulates the signal to 70MHz intermediate frequency.Receive terminal and receive downward signal of satellite and little ring signal (from the signal of Antenna aperture coupling), measure pseudorange, measurement result is delivered data acquisition and procession unit.
Time-interval-unit measures the time difference of the 1pps signal to be measured 1pps signal produced internal with baseband processing unit, will deliver data acquisition and procession unit the time difference.
The outer station measurement result that the pseudorange that baseband processing unit is measured by data acquisition and procession unit obtains with demodulation is analyzed, the measurement result of binding time interval measurement unit, analyzes the systematic error result obtaining system under test (SUT).
Assume that two tested stations are respectively A station and B stands.The flow process that the systematic error using way moving calibration station to test tested remote time Compare System is tested is as shown in Figure 3.
First, stand at tested A, first two set way moving calibrator (-ter) units are put together, provide reference with the reference time of A station remote time Compare System for two complete equipments.Receipts mutually are sent out mutually by satellite, (zero base line comparison is two complete equipment next-door neighbours to be installed, and uses identical reference signal to drive two complete equipments, tests to carry out zero base line comparison, " it is close to " and refers to that the distance that two complete equipments are installed is less than 2m), the result recorded is designated as T1.Because two movement stations are homology zero base line comparison, up-downgoing propagation delay is of substantially equal, thus T1 is two sets move calibrator (-ter) unit A station environment under relative time delay.
Then, the most a set of way moving calibrator (-ter) unit moving to tested B station, the reference time using B station remote time Compare System is reference, sets up two-way temporal frequency relays link with the way moving calibrator (-ter) unit at A station, tests, and the result recorded is designated as T2.T2 comprises A, B two the tested remote time in the station Compare System reference time clock correction and two sets mobile calibrator (-ter) unit relative time delay.
3rd, stand at tested B, two set way moving calibrator (-ter) units are put together, there is provided reference with the reference time of B station remote time Compare System for two complete equipments, sent out receipts mutually by satellite mutually, carry out zero base line comparison, the result recorded is designated as T3, because two movement stations are homology zero base line comparison, up-downgoing propagation delay is of substantially equal, thus T3 is two sets move calibrator (-ter) unit B station environment under relative time delay.
Finally, calculate the average of T1 and T3, as the relative time delay of two set way moving calibrator (-ter) units self；In test data T2 to way moving calibrator (-ter) unit, the relative time delay of the mobile calibrator (-ter) unit self of deduction two set, obtain A, B two true clock correction of reference time of remote time Compare System, with A, B two the actually measured clock correction of remote time Compare System subtract each other, it is system under test (SUT) and measures the systematic error of remote time, be used for calibrating this remote time and measure system.
Carry out nanosecond remote time comparison/transmission system based on way moving calibration station to calibrate for error, test is divided into four-stage every time, it is that after testing front equipment its own system error calibration, systematic error test, test, equipment its own system error is checked and data process respectively, elaboration separately below:
1) equipment its own system error calibration before test
As shown in Figure 4, the target in this stage is before official testing, uses zero base line method self-calibration system error.First the two set way moving calibration stations 1 and 2 participating in test are installed to same testing location A (being calibrated one of them place of the remote time Compare System of systematic error), with 10MHz and the 1pps signal identical with A station system under test (SUT) input as reference signal, it is respectively connected to two way moving calibration stations, for calibrator (-ter) unit its own system error.
The geometric center distance of the exterior aerial infield of (1) two complete equipment is less than 2m；
(2) connect equipment, utilize circumferentor or level measurement levelness, by regulating three supporting legs of antenna, make antenna be in level, according to horizontal compass by antenna towards due south；
(3) the 10MHz signal provided by tested place A and 1pps are respectively connected to the reference signal input port of way moving calibration station 1, and the 10MHz signal and 2 the 1pps signals that generate 4 homologies overlap the public reference signal needed for way moving calibration station systematic errors are demarcated as two；
(4) way moving calibration station equipment is started；
(5), after ready, start star is operated；
(6) according to the polarizing angle in satellite information table, by domain switching to designated value；
(7) according to the elevation angle in satellite information table, the arrow that bar is carved in the pitching after antenna is moved to designated value；
(8) according to the azimuth value in satellite information table, by the orientation adjustment of antenna to designated value；
(9) portable audiofrequency spectrometer is utilized to carry out fine tuning, disconnect the connection of converter IF OUT and time-frequency modem RF IN, converter IF OUT is connected to portable audiofrequency spectrometer test input with test cable, make snr of received signal maximum, disconnect test cable and converter IF OUT, recover the connection of converter IF OUT and time-frequency modem RF IN, start way moving calibration station；
(10) another set of way moving calibration station is started by step (4)～(9) same procedure, after confirming that two set way moving calibration stations normally work, test the communication link between two complete equipments the most unimpeded, method is to send test data by COM Debug Assistant to remote station, see whether to normally receive the test data from remote station simultaneously, normal after close COM Debug Assistant；
(11) opening timing tracking accuracy assessment software between station, arranging measurement interval is 10s, and remaining selects default setting, starts software；
(12) data after test data accept and believe way moving calibration station stable operation 1 hour, Continuous Observation 24 hours；
(13), after obtaining enough test data, close each soft hardware equipment of two set way moving calibration stations, and the most a set of way moving calibration station is dismantled, packaging, prepare to transport next testing location to.
2) systematic error test
As it is shown in figure 5, the target in this stage is to complete the original test to tested remote time Compare System systematic error.The way moving calibration station 1 participating in test is installed to tested place A, and way moving calibration station 2 is installed to testing location B, is respectively two set way moving calibration stations offer test references with A and B with 10MHz and the 1pps signal inputting system under test (SUT) homology.
(1) way moving calibration station 2 is transported to the installation of B station, and carries out corresponding test job；
(2) utilize circumferentor or level measurement levelness, by regulating three supporting legs of antenna, make antenna be in level, according to horizontal compass by antenna towards due south；
(3) the 10MHz signal provided by tested place B and 1pps are respectively connected to the reference signal input port of way moving calibration station 2, the reference signal that the 10MHz signal of 2 homologies of generation and 1 1pps signal are tested as way moving calibration station 2；
(4) way moving calibration station equipment is started；
(5) according to the polarizing angle in satellite information table, by domain switching to designated value；
(6) according to the elevation angle in satellite information table, the arrow that bar is carved in the pitching after antenna is moved to designated value；
(7) according to the azimuth value in satellite information table, by the orientation adjustment of antenna to designated value；
(8) portable audiofrequency spectrometer is utilized to carry out fine tuning, disconnect the connection of converter IF OUT and time-frequency modem RF IN, converter IF OUT is connected to portable audiofrequency spectrometer test input with test cable, make snr of received signal maximum, disconnect test cable and converter IF OUT, recover the connection of converter IF OUT and time-frequency modem RF IN, start way moving calibration station；
(9) communication link of test two set way moving calibration station equipment room is the most unimpeded, method is to send test data by COM Debug Assistant to remote station, see whether to normally receive the test data from remote station simultaneously, normal after close COM Debug Assistant；
(10) opening timing tracking accuracy assessment software between the station at A and B station, arranging measurement interval is 10s, and remaining selects default setting, starts software；
(11) data after test data accept and believe way moving calibration station stable operation 1 hour, Continuous Observation is no less than 3 days × 24 hours, it is proposed that test 7 days；
(12), after obtaining enough test data, close each soft hardware equipment of two set way moving calibration stations, and the way moving calibration station dismounting stood by A, packaging, prepare to transport next testing location to.
3) equipment its own system error calibration after test
As shown in Figure 6, the target in this stage is after completing original test, uses zero base line method to check and arranges its own system error.Way moving calibration station 2 equipment keeping B station is installed constant, and the way moving calibration station 1 that A stands is carried to B station, tests systematic error with 10MHz and the 1pps signal at B station for common reference.
(1) way moving calibration station 1 is transported to the installation of B station, and carries out corresponding test job；
(2) way moving calibration station 1 being installed to B station install adjacent to place with way moving calibration station 2, the geometric center distance of the exterior aerial infield of two complete equipments is less than 2m；
(3) way moving calibration station 1 has been connected according to the operation instructions of way moving calibration station at B station, utilize circumferentor or level measurement levelness, by regulating three supporting legs of antenna, antenna is made to be in level, according to horizontal compass by antenna towards due south；
(4) the 10MHz signal provided by tested place B and 1pps are respectively connected to the reference signal input port of way moving calibration station 2, and the 10MHz signal and 2 the 1pps signals that generate 4 homologies overlap the public reference signal needed for way moving calibration station systematic errors are demarcated as two；
(5) way moving calibration station equipment 2 is started；
(6) according to the polarizing angle in satellite information table, by domain switching to designated value；
(7) according to the elevation angle in satellite information table, the arrow that bar is carved in the pitching after antenna is moved to designated value；
(8) according to the azimuth value in satellite information table, by the orientation adjustment of antenna to designated value；
(9) portable audiofrequency spectrometer is utilized to carry out fine tuning, disconnect the connection of converter IF OUT and time-frequency modem RF IN, converter IF OUT is connected to portable audiofrequency spectrometer test input with test cable, make snr of received signal maximum, disconnect test cable and converter IF OUT, recover the connection of converter IF OUT and time-frequency modem RF IN, start way moving calibration station；
(10) communication link of test two set way moving calibration station equipment room is the most unimpeded, method is to send test data by COM Debug Assistant to remote station, see whether to normally receive the test data from remote station simultaneously, normal after close COM Debug Assistant；
(11) way moving calibration station 1 and 2 data transmission module is opened；
(12) opening timing tracking accuracy assessment software between station, arranging measurement interval is 10s, and remaining selects default setting, starts software；
(13) data after test data accept and believe way moving calibration station stable operation 1 hour, Continuous Observation 24 hours；
(14), after obtaining enough test data, close each soft hardware equipment of two set way moving calibration stations, and by two set way moving calibration station dismountings, packaging, terminate the work of epicycle field testing.
4) data process
After completing above-mentioned test process, carry out data process, process the systematic error test result obtaining tested remote time Compare System according to test data analysis.
(1) before test, equipment its own system error calibration data analysing method is: record 24 hours initial datas, after 3 σ principle elimination of rough difference, calculate average and the standard deviation of 24 hours measurement data, under average reflection zero base line test condition, at the systemic error T of A station two set way moving calibration station equipment selfA, under standard deviation reflection zero base line test condition, way moving calibration station is in the dispersion degree of A station test result；
(2) after test, equipment its own system error calibration phase data analysis and processing method is: record 24 hours initial datas, after 3 σ principle elimination of rough difference, calculate average and the standard deviation of 24 hours measurement data, under average reflection zero base line test condition, at the systemic error T of B station two set way moving calibration station equipment selfB, under standard deviation reflection zero base line test condition, system is in the dispersion degree of B station test result；
(3) systematic error test data analysis method is: record 3 × 24 hours initial datas, after 3 σ principle elimination of rough difference, calculate average and the standard deviation of 3 × 24 hours measurement data, average is original difference TI of two station reference times, and standard deviation is two station reference time change at random situations；
(4) cable time delay reduction TL is obtained according to cable time delay calibration resultAAnd TLB；
(5) A and B two station reference time difference TI the most to be testedP=TI-(TTA+TTB)/2-(TLA-TLB)；
(6) the reference time difference that the remote time Compare System between tested A and B two station records the same period is TIu, then according to way moving calibration station record two the station reference times difference TIPAs a result, it is possible to obtain being calibrated the systemic error S of remote time Compare Systemerror=TIu-TIP。
Claims (2)
1. subnanosecond level remote time comparison/transmission system error testing method, it is characterised in that comprise the steps:
Step one, stands at tested A, puts together, the two identical way moving calibrator (-ter) units of set with tested A
The reference time of remote time of standing Compare System provides reference for two set way moving calibrator (-ter) units；Two set way moving schools
Quasi-equipment sends out receipts mutually mutually by satellite, carries out zero base line comparison, and comparison result T1 is two set way moving calibrator (-ter) units
Relative time delay under the environment of tested A station；
Step 2, moves to tested B station by any a set of way moving calibrator (-ter) unit, uses tested B station remote time ratio
Reference time to system is reference, sets up frequency of two-way time by the way moving calibrator (-ter) unit of satellite with tested A station
Rate relays link, carries out the test of the two places time difference, comprises tested A, B two station remote time comparison system in result T2 recorded
The system clock correction of reference time and two sets mobile calibrator (-ter) unit relative time delay；
Step 3, stands at tested B, is put together by two set way moving calibrator (-ter) units, with tested B station remote time
The reference time of Compare System provides reference for two set way moving calibrator (-ter) units；Way moving calibration is sent out mutually by satellite
Receiving mutually, carry out zero base line comparison, comparison result T3 is two set way moving calibrator (-ter) units phases under the environment of tested B station
To time delay；
Step 4, calculates the average of T1 and T3, as the relative time delay of two set way moving calibrator (-ter) units self；
Step 5, deducts the relative time delays of two set way moving calibrator (-ter) units self in T2, obtains tested A, B two station
The clock correction true value of the reference time of remote time Compare System, with tested A, B two reality of station remote time Compare System
Record clock correction to subtract each other, obtain system under test (SUT) and measure the systematic error of remote time, be used for calibrating this remote time and measure system
System.
Subnanosecond level remote time comparison/transmission system error testing method the most according to claim 1, its feature exists
In: described way moving calibration station includes that radio-frequency transmissions is surveyed with reception unit, baseband processing unit, time interval
Amount unit, data acquisition and procession unit；Described radio-frequency transmissions with receive unit with tested remote time comparison system
System homology output 10MHz be reference, by baseband processing unit produce 70MHz signal up-conversion and amplify,
Through duplexer and sky alignment satellite launch, receive the outer station signal of satellite downlink, lower change after low noise is amplified simultaneously
Frequency, to 70MHz, delivers to baseband processing unit；While satellite emission signal, couple one from Antenna aperture
Part signal, after tested after transponder down coversion, measures for baseband processing unit, calibrates equipment delay；
Described baseband processing unit includes launch terminal and receives terminal, and launch terminal is according to A station or the reference at B station
Time signal produces ranging code and modulated signal, modulates the signal to 70MHz intermediate frequency；Receive terminal and receive satellite
Downstream signal and the signal from Antenna aperture coupling, measure pseudorange, measurement result delivered data acquisition and procession
Unit；Described time-interval-unit measures A station or the reference time signal at B station and baseband processing unit
The time difference of the internal 1pps signal produced, data acquisition and procession unit will be delivered the time difference；Described data acquisition
The outer station measurement result that the pseudorange measured baseband processing unit with processing unit obtains with demodulation is analyzed, in conjunction with
The measurement result of time-interval-unit, is calculated the systematic error result of system under test (SUT).
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