CN106656451B - Time keeping and time service precision testing device and method based on satellite time service system - Google Patents
Time keeping and time service precision testing device and method based on satellite time service system Download PDFInfo
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- CN106656451B CN106656451B CN201611250240.2A CN201611250240A CN106656451B CN 106656451 B CN106656451 B CN 106656451B CN 201611250240 A CN201611250240 A CN 201611250240A CN 106656451 B CN106656451 B CN 106656451B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
- H04L7/0012—Synchronisation information channels, e.g. clock distribution lines by comparing receiver clock with transmitter clock
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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
- 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
- G04R20/06—Decoding time data; Circuits therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention belongs to the field of photoelectric testing, and relates to a time keeping and time service precision testing device and method based on a satellite navigation system. The time keeping and time service precision is calculated by recording the arrival time of the signal to be measured, and the time keeping and time service precision testing system and method based on the GPS/Beidou system are simple in testing process and easy to realize engineering.
Description
Technical Field
The invention belongs to the field of photoelectric testing, and relates to a satellite navigation system-based time keeping and time service precision testing device and method.
Background
The time synchronization is to align clocks in different places, take one of the clocks as standard time, and adjust the other clock to the standard time, so as to achieve the clock synchronization. With the development of scientific technology, high-precision time synchronization is widely applied to various industries. At present, four satellite time service systems are mainly used, namely a GPS system in the United states, a Beidou system in China, a GLONASS system in Russia and a Galileo system in Europe. In China, the GPS system and the Beidou system are widely used.
There are two different synchronization methods according to the constitution of the clock synchronization signal, one is serial/parallel synchronization mode and the other is pulse synchronization mode.
The serial/parallel synchronization mode generally uses an IRIG-B code (B time code, which can be divided into an AC code and a DC code according to its signal characteristics), and the time frame frequency of the B time code is 1 frame/s; 100 bits of information (including year, month, day, hour, minute, second) may be transferred. Each type of device receives serial/parallel time information every second, and clock synchronization is realized according to the data stream. The clock synchronization information data includes whole second information accurate to seconds such as time of year, month, day, minute, second, and the like. The method is relatively simple, however, the biggest disadvantage is that the data acquired by the serial/parallel interface has a certain time delay in the transmission process, and the clock synchronization precision is low, if the clock synchronization precision needs to be further improved, other methods need to be combined.
The pulse synchronous mode receives signals from satellites at fixed time intervals to generate a pulse signal, and the receiving device uses corresponding hardware and software to process according to the pulse to adjust a local clock so as to achieve the synchronization of a user clock, and the period and the frequency interval of the pulse are all equal-time interval reception under ideal conditions. The pulse synchronization mode is simple and easy to use compared with other modes. This signal is typically a full second time pulse and is used as a clock clearance standard to synchronize the clocks of the devices.
The most important indexes in time synchronization are synchronization accuracy and time keeping accuracy. The index is the main index of the B time code interface terminal. According to the general specification of the B time code interface terminal (GJB 2991A-2008), the measurement of the synchronous precision and the time keeping precision needs to be tested equipment to output standard second pulse, and an IV type B code interface terminal is needed during the test. The following problems exist in the actual test:
(1) The IV type B code interface terminal has low popularization rate in actual use, and the test condition is not easy to meet;
(2) For equipment without standard second pulse output, no effective measuring means exists;
(3) The test method can only measure the equipment with pulse synchronous output, and can not test serial/parallel synchronization.
Disclosure of Invention
In order to solve the technical problems in the background technology, the invention provides a time keeping and time service precision testing device and method based on a satellite time service system.
The technical scheme of the invention is as follows: a time keeping and time service precision testing device based on a satellite time service system is characterized in that: the system comprises a receiving antenna, a satellite signal receiver, an interface unit, a B code demodulation unit, a main control unit, a time sequence machine, a time delay PLL unit, a computer and a temperature compensation crystal oscillator;
the input end of the satellite signal receiver is connected with the receiving antenna, and the output end of the satellite signal receiver is respectively connected with the B code demodulation unit, the main control unit and the computer through the interface unit;
the B code demodulation unit is connected with the main control unit through the interface unit;
the main control unit is connected with the tested equipment and the computer through the interface unit respectively;
the main control unit is connected with the time sequence machine and the delay PLL unit and then connected with the tested equipment through the interface unit;
the temperature compensation crystal oscillator is connected with the main control unit;
the interface unit is provided with a 1PPS standard second signal output interface, a B time code output interface and a test interface.
Preferably, the PPS second pulse precision of the satellite signal receiver is higher than 10ns, the pulse width is 100+/-10 ms, and the satellite locking time is less than 1 minute.
Preferably, the interface unit has an RS422 input/output interface, an RS232 input/output interface, an LVDS input/output interface, and an SMA input/output interface; and the delay time of the SMA input-output interface is less than 5ns.
Preferably, the working frequency of the temperature compensation crystal oscillator is higher than 10MHz, the frequency temperature stability is +/-5 ppm, and the aging rate is +/-5 ppm/year.
Preferably, the satellite signal receiver, the interface unit, the B-code demodulation unit, the main control unit, the time sequence machine, the time delay PLL unit and the temperature compensation crystal oscillator are packaged in an electric cabinet.
The invention also provides a time service precision testing method based on the satellite time service system, which is characterized by comprising the following steps of: the method comprises the following steps:
1) Connecting a 1PPS standard second signal output interface of the interface unit with a second pulse interface of tested equipment; connecting a B time code output interface of the interface unit with a B time code interface of the tested equipment; connecting a signal output interface to be tested of the tested equipment with a test interface of an interface unit;
2) The receiving antenna transmits the received satellite signals to the satellite signal receiver, and the satellite signal receiver locks a plurality of satellites and receives B time code signals and 1PPS second pulse signals transmitted by the satellites;
3) The satellite signal receiver sends satellite locking signals to the computer through the interface unit, and the computer judges whether the number of the locked satellites is more than or equal to 4; if yes, executing the step 4); if not, adjusting the position of the receiving antenna and returning to the step 2);
4) The satellite signal receiver sends a satellite locking signal and a received 1PPS second pulse signal to the main control unit through the interface unit, and the satellite signal receiver sends a received B time code signal to the B code demodulation unit through the interface unit;
5) B code demodulation unit sends B time code signal after error correction or phase self-adaption to main control unit through interface unit, and updates data once per second;
the main control unit outputs the received B time code signal to the time sequence machine and the delay PLL unit, completes the forming, precision alignment and delay output control logic of the AC/DC B time code in the time sequence machine and the delay PLL unit, and then outputs the B time code signal to the tested equipment through the B time code output interface of the interface unit;
the main control unit outputs the received 1PPS second pulse signal to the tested equipment through the interface unit;
the main control unit receives a clock signal output by the temperature compensation crystal oscillator, divides the frequency of the clock signal to be used as a counter, and the frequency after frequency division is not lower than 100MHz; calculating microsecond value of the moment through the count value, wherein the resolution is not lower than 0.1ms; the count value is cleared by a 1PPS second pulse signal every second;
6) The tested equipment receives the B time code signal and the 1PPS second pulse signal, performs time synchronization, and sends the signal to be tested to the main control unit through the test interface of the interface unit after the synchronization is completed;
7) The main control unit records the arrival time of the signal to be detected, reads the B time code of the signal to be detected to obtain the information of the day, the time, the minute and the second of the time, and reads the count value of the counter to obtain the microsecond information of the time; the main control unit sends the obtained time information to the computer through the interface unit;
8) The computer tests the time service precision of the tested equipment:
if the signal to be measured is a 1PPS second pulse signal, the day, time, minute and second values of the time information read by the computer are consistent with those of the tested equipment, and the microsecond value of the time information read by the computer is the time service precision of the tested equipment;
if the signal to be measured is a pulse signal of non-1 PPS second, the day, time, minute and second values of the time information read by the computer are consistent with those of the tested equipment, and the absolute value of the difference between the microsecond value of the time information read by the computer and the microsecond value of the signal to be measured is the time service precision of the tested equipment.
Preferably, the time service accuracy is the maximum value after repeating the test three times.
The invention also provides a time keeping precision testing method based on the satellite time service system, which is characterized by comprising the following steps of: the method comprises the following steps:
1) Connecting a 1PPS standard second signal output interface of the interface unit with a second pulse interface of tested equipment; connecting a B time code output interface of the interface unit with a B time code interface of the tested equipment;
2) The receiving antenna transmits the received satellite signals to the satellite signal receiver, and the satellite signal receiver locks a plurality of satellites and receives B time code signals and 1PPS second pulse signals transmitted by the satellites;
3) The satellite signal receiver sends satellite locking signals to the computer through the interface unit, and the computer judges whether the number of the locked satellites is more than or equal to 4; if yes, executing the step 4); if not, adjusting the position of the receiving antenna and returning to the step 2);
4) The satellite signal receiver sends a satellite locking signal and a received 1PPS second pulse signal to the main control unit through the interface unit, and the satellite signal receiver sends a received B time code signal to the B code demodulation unit through the interface unit;
5) B code demodulation unit sends B time code signal after error correction or phase self-adaption to main control unit through interface unit, and updates data once per second;
the main control unit outputs the received B time code signal to the time sequence machine and the delay PLL unit, completes the forming, precision alignment and delay output control logic of the AC/DC B time code in the time sequence machine and the delay PLL unit, and then outputs the B time code signal to the tested equipment through the B time code output interface of the interface unit;
the main control unit outputs the received 1PPS second pulse signal to the tested equipment through the interface unit;
the main control unit receives a clock signal output by the temperature compensation crystal oscillator, divides the frequency of the clock signal to be used as a counter, and the frequency after frequency division is not lower than 100MHz; calculating microsecond value of the moment through the count value, wherein the resolution is not lower than 0.1ms; the count value is cleared by a 1PPS second pulse signal every second;
6) The tested equipment receives the B time code signal and the 1PPS second pulse signal and then performs time synchronization, and after the synchronization is completed, the tested equipment is disconnected with the interface unit;
after the tested equipment independently operates for a set time, connecting a signal output interface to be tested of the tested equipment with a test interface of the interface unit; the tested equipment sends the signal to be tested to the main control unit;
7) The main control unit records the arrival time of the signal to be detected, reads the B time code of the signal to be detected to obtain the information of the day, the time, the minute and the second of the time, and reads the count value of the counter to obtain the microsecond information of the time; the main control unit sends the obtained time information to the computer through the interface unit;
8) The computer tests the time keeping precision of the tested equipment:
if the signal to be measured is a 1PPS second pulse signal, the day, time, minute and second values of the time information read by the computer are consistent with those of the tested equipment, and the microsecond value of the time information read by the computer is the time keeping precision of the tested equipment;
if the signal to be measured is a pulse signal of non-1 PPS second, the day, time, minute and second values of the time information read by the computer are consistent with those of the tested equipment, and the absolute value of the difference between the microsecond value of the time information read by the computer and the microsecond value of the signal to be measured is the time keeping precision of the tested equipment.
Preferably, the time keeping accuracy is the maximum value after repeating the test three times.
The invention has the beneficial effects that:
(1) The invention calculates the time keeping and time service precision by recording the arrival time of the signal to be measured. The time keeping and timing precision testing system and method based on the GPS/Beidou system are simple in testing process and easy to realize engineering.
(2) The invention does not need other auxiliary equipment when measuring the time keeping and time service precision, and simplifies the testing process.
(3) The invention uses 1PPS standard second pulse and B time code signal generated by the system itself to synchronize the time of the tested device. The test error caused by using different 1PPS standard second pulse and B time code signals is effectively avoided.
(4) The interface unit of the invention is provided with an RS422 input interface, an RS232 input interface and an LVDS input interface. The acquisition work of various signals to be detected can be completed. The invention can send 2V p-p ～8V p-p B (AC) time code of RS422 and RS232, and B (DC) time code signals of RS232 to the tested equipment, thereby improving the universality of the tested equipment.
(5) The invention uses high-precision temperature compensation crystal as a frequency standard. The crystal oscillator has higher frequency temperature stability: 5ppm, reducing the influence of the ambient temperature on the test; the crystal oscillator has lower aging rate: and the stability and the testing precision of the testing equipment are improved by +/-5 ppm/year.
(6) The invention uses the high-precision time sequence machine and the delay PLL to carry out precision alignment and delay control output on the B time code, thereby improving the test precision.
(7) The invention realizes automatic test of time keeping and time service precision by using computer control and data acquisition technology, and saves labor and cost.
Drawings
Fig. 1 is a system schematic diagram of a time keeping and time service precision testing device based on a satellite time service system.
Detailed Description
Referring to fig. 1, the invention provides a time keeping and timing precision testing device based on a satellite timing system, and the system structure of the preferred embodiment mainly comprises a receiving antenna, a satellite signal receiver (a GPS/beidou receiver is selected in the embodiment), an interface unit, a B-code demodulation unit, a high-precision temperature compensation crystal oscillator, a main control unit, a high-precision time sequence machine, a time delay PLL and a computer.
The receiving antenna is connected with the antenna end of the GPS/Beidou receiver. The interface unit is respectively connected with the GPS/Beidou receiver, the B code demodulation unit, the main control unit and the computer. The main control unit is respectively connected with the interface unit, the high-precision temperature compensation crystal oscillator, the high-precision time sequence machine and the delay PLL.
The PPS second pulse precision of the GPS/Beidou receiver is better than 10ns, the pulse width is 100ms plus or minus 10ms. The GPS acquisition time is less than 1 minute.
The interface unit is provided with an RS422 input/output interface, an RS232 input/output interface, an LVDS input/output interface and an SMA input/output interface. Wherein the delay of the 2-path SMA output interface is less than 5ns. Can receive and transmit 2V p-p ～8V p-p B (AC) time code of RS422, and B (DC) time code signal of RS 422.
The B-code demodulation unit has a B-time code error correction function and a B (AC) code phase adaptation function. Has at least 30-bit parallel code time code output function (7 bits per second, 7 bits per minute, 6 bits per hour and 10 bits per day), high level effect and TTL level.
The working frequency of the high-precision temperature compensation crystal oscillator is higher than 10MHz; has higher frequency temperature stability: 5ppm; lower aging rate: 5 ppm/year.
The GPS/Beidou receiver, the interface unit, the B code demodulation unit, the high-precision temperature compensation crystal oscillator, the main control unit, the high-precision time sequence machine and the delay PLL are packaged in the electric cabinet.
The working principle of the time keeping and time service precision testing device based on the satellite time service system provided by the invention is as follows:
the receiving antenna receives the GPS/Beidou signal and sends the GPS/Beidou signal to the GPS/Beidou receiver. The GPS/Beidou receiver locks more than 4 GPS/Beidou satellites. And receiving the B time code signal and the 1PPS second pulse signal sent by the satellite. The interface unit sends a B time code signal to the B code demodulation unit, and sends a 1PPS second pulse signal and a satellite locking signal to the main control unit. And sending a locking signal to the computer.
After receiving the satellite locking signal, the main control unit receives the B time code data of the B code demodulation unit after error correction (DC code) or phase adaptation (AC code), and updates the data every second. And B time code signals are output to a high-precision time sequence machine and a delay PLL unit, forming, precision alignment and delay output control logic of the alternating current-direct current B time code are completed in the unit, and then a value interface unit is output. After receiving the 1PPS second pulse, the main control unit directly forwards the time mark signal to be used as a standard 1PPS second pulse.
The main control unit receives a clock signal output by the high-precision temperature compensation crystal oscillator, divides the frequency of the clock signal to be used as a counting clock, and the frequency after frequency division is not lower than 100MHz; the microsecond value at this time is calculated from the count value, and the resolution is not lower than 0.1us. The count value is cleared every second by a standard 1PPS second pulse signal.
The main control unit sends a standard 1PPS second pulse signal and a B time code signal to the tested equipment through the interface unit for time synchronization. The main control unit receives a signal to be tested sent by the tested equipment. Recording the moment when the signal to be measured arrives (rising edge or falling edge): and reading the time code B and the count value of the counter to obtain the information of days, hours, minutes, seconds and microseconds at the moment. The result is sent to the computer through the interface unit.
The specific workflow of the time keeping and time service precision testing device based on the satellite time service system provided by the invention is as follows:
1) Connecting a system 1PPS standard second signal output interface with a second pulse interface of tested equipment; the system B time code output interface is connected with the tested equipment B time code interface; connecting a characteristic signal output interface of the tested equipment with a test interface of the system;
2) And placing the receiving antenna in an outdoor open field, and connecting the receiving antenna to a GPS/Beidou receiver. Turning on a power supply of the equipment;
3) Wait one minute to see if the computer has received the lock information. If more than 4 satellites are locked, the next step is performed. If the number of the locked satellites is less than 4 or the locking fails, adjusting the position of the receiving antenna, and repeating the step 2);
4) The tested equipment receives a 1PPS standard second pulse signal and a B time code signal sent by a system; waiting for the tested equipment to perform time synchronization; after synchronization is completed, outputting a characteristic signal to the system;
5) The system records the time (including day, time, minute, second and microsecond information) when the characteristic signal arrives (the rising edge is valid or the falling edge is valid); and outputs the information to a computer.
6) According to the test requirements and test conditions, the following four conditions are adopted:
a) Testing time service precision and outputting 1PPS second pulse signal: checking a computer test result, wherein the values of day, time, minute and second are consistent with the tested equipment (if the values are inconsistent, the error of serial port/parallel dictation is more than or equal to 1s, and the values are generally regarded as unqualified), and the microsecond value is not only time service precision; repeating the test for more than 3 times, and taking the maximum value as a test result;
b) Testing time service precision and outputting a signal which is a pulse signal of non-1 PPS seconds: checking a computer test result, wherein the values of day, time, minute and second are consistent with the tested equipment (if the values are inconsistent, the error of serial port/parallel dictation is more than or equal to 1s, and the error is generally regarded as unqualified), and the absolute value of the difference between the microsecond value recorded by the tested equipment and the microsecond value of the system is not only time service precision; repeating the test for more than 3 times, and taking the maximum value as a test result;
c) The time keeping accuracy is tested and the output signal is 1PPS second pulse signal: after the synchronization is completed, the tested equipment disconnects the 1PPS standard second pulse signal and the B time code signal. After the tested equipment independently operates for a set time (for example, 30 minutes or 24 hours), testing is started, and a computer test result is checked, wherein the values of day, time, minute and second are consistent with the tested equipment (if the values are inconsistent, the serial port/parallel port time keeping error is greater than or equal to 1s and is generally regarded as unqualified), and the microsecond value is time keeping precision; repeating the test for more than 3 times, and taking the maximum value as a test result;
d) The time keeping accuracy is tested and the output signal is a pulse signal of non-1 PPS seconds: after the synchronization is completed, the tested equipment disconnects the 1PPS standard second pulse signal and the B time code signal. After the tested equipment independently operates for a set time (for example, 30 minutes or 24 hours), testing is started, and a computer test result is checked, wherein the values of day, time, minute and second are consistent with the recorded values of the tested equipment (if the values are inconsistent, the error of serial port/parallel dictation is greater than or equal to 1s and is generally regarded as disqualification), and the absolute value of the difference between the microsecond value recorded by the tested equipment and the microsecond value of the system is the time keeping precision; repeating the test for more than 3 times, and taking the maximum value as a test result.
Claims (8)
1. A time service precision testing method based on a satellite time service system is based on a time keeping and time service precision testing device of the satellite time service system, and comprises a receiving antenna, a satellite signal receiver, an interface unit, a B code demodulation unit, a main control unit, a time sequence machine, a time delay PLL unit, a computer and a temperature compensation crystal oscillator;
the input end of the satellite signal receiver is connected with the receiving antenna, and the output end of the satellite signal receiver is respectively connected with the B code demodulation unit, the main control unit and the computer through the interface unit;
the B code demodulation unit is connected with the main control unit through the interface unit;
the main control unit is connected with the tested equipment and the computer through the interface unit respectively;
the main control unit is connected with the time sequence machine and the delay PLL unit and then connected with the tested equipment through the interface unit;
the temperature compensation crystal oscillator is connected with the main control unit;
the interface unit is provided with a 1PPS standard second signal output interface, a B time code output interface and a test interface;
the method is characterized in that: the method comprises the following steps:
1) Connecting a 1PPS standard second signal output interface of the interface unit with a second pulse interface of tested equipment; connecting a B time code output interface of the interface unit with a B time code interface of the tested equipment; connecting a signal output interface to be tested of the tested equipment with a test interface of an interface unit;
2) The receiving antenna transmits the received satellite signals to the satellite signal receiver, and the satellite signal receiver locks a plurality of satellites and receives B time code signals and 1PPS second pulse signals transmitted by the satellites;
3) The satellite signal receiver sends satellite locking signals to the computer through the interface unit, and the computer judges whether the number of the locked satellites is more than or equal to 4; if yes, executing the step 4); if not, adjusting the position of the receiving antenna and returning to the step 2);
4) The satellite signal receiver sends a satellite locking signal and a received 1PPS second pulse signal to the main control unit through the interface unit, and the satellite signal receiver sends a received B time code signal to the B code demodulation unit through the interface unit;
5) B code demodulation unit sends B time code signal after error correction or phase self-adaption to main control unit through interface unit, and updates data once per second;
the main control unit outputs the received B time code signal to the time sequence machine and the delay PLL unit, completes the forming, precision alignment and delay output control logic of the AC/DC B time code in the time sequence machine and the delay PLL unit, and then outputs the B time code signal to the tested equipment through the B time code output interface of the interface unit;
the main control unit outputs the received 1PPS second pulse signal to the tested equipment through the interface unit;
the main control unit receives a clock signal output by the temperature compensation crystal oscillator, divides the frequency of the clock signal to be used as a counter, and the frequency after frequency division is not lower than 100MHz; calculating microsecond value of the moment of receiving the pulse signal through the count value, wherein the resolution is not lower than 0.1 mu s; the count value is cleared by a 1PPS second pulse signal every second;
6) The tested equipment receives the B time code signal and the 1PPS second pulse signal, performs time synchronization, and sends the signal to be tested to the main control unit through the test interface of the interface unit after the synchronization is completed;
7) The main control unit records the arrival time of the signal to be detected, reads the B time code of the signal to be detected to obtain the information of the day, the time, the minute and the second of the time, and reads the count value of the counter to obtain the microsecond information of the time; the main control unit sends the obtained time information to the computer through the interface unit;
8) The computer tests the time service precision of the tested equipment:
if the signal to be measured is a 1PPS second pulse signal, the day, time, minute and second values of the time information read by the computer are consistent with those of the tested equipment, and the microsecond value of the time information read by the computer is the time service precision of the tested equipment;
if the signal to be measured is a pulse signal of non-1 PPS second, the day, time, minute and second values of the time information read by the computer are consistent with those of the tested equipment, and the absolute value of the difference between the microsecond value of the time information read by the computer and the microsecond value of the signal to be measured is the time service precision of the tested equipment.
2. The time service precision testing method based on the satellite time service system according to claim 1, wherein the time service precision testing method is characterized in that: the time service precision is the maximum value after repeating the test three times.
3. The time service precision testing method based on the satellite time service system according to claim 1, wherein the time service precision testing method is characterized in that:
the PPS second pulse precision of the satellite signal receiver is higher than 10ns, the pulse width is 100+/-10 ms, and the satellite locking time is less than 1 minute;
the interface unit is provided with an RS422 input/output interface, an RS232 input/output interface, an LVDS input/output interface and an SMA input/output interface; and the delay time of the SMA input-output interface is less than 5ns.
4. The time service precision testing method based on the satellite time service system according to claim 1, wherein the time service precision testing method is characterized in that:
the working frequency of the temperature compensation crystal oscillator is higher than 10MHz, the frequency temperature stability is +/-5 ppm, and the aging rate is +/-5 ppm/year;
the satellite signal receiver, the interface unit, the B code demodulation unit, the main control unit, the time sequence machine, the time delay PLL unit and the temperature compensation crystal oscillator are packaged in the electric cabinet.
5. A time keeping precision testing method based on a satellite time service system is based on a time keeping and time service precision testing device of the satellite time service system, and comprises a receiving antenna, a satellite signal receiver, an interface unit, a B code demodulation unit, a main control unit, a time sequence machine, a time delay PLL unit, a computer and a temperature compensation crystal oscillator;
the input end of the satellite signal receiver is connected with the receiving antenna, and the output end of the satellite signal receiver is respectively connected with the B code demodulation unit, the main control unit and the computer through the interface unit;
the B code demodulation unit is connected with the main control unit through the interface unit;
the main control unit is connected with the tested equipment and the computer through the interface unit respectively;
the main control unit is connected with the time sequence machine and the delay PLL unit and then connected with the tested equipment through the interface unit;
the temperature compensation crystal oscillator is connected with the main control unit;
the interface unit is provided with a 1PPS standard second signal output interface, a B time code output interface and a test interface;
the method is characterized in that: the method comprises the following steps:
1) Connecting a 1PPS standard second signal output interface of the interface unit with a second pulse interface of tested equipment; connecting a B time code output interface of the interface unit with a B time code interface of the tested equipment;
2) The receiving antenna transmits the received satellite signals to the satellite signal receiver, and the satellite signal receiver locks a plurality of satellites and receives B time code signals and 1PPS second pulse signals transmitted by the satellites;
3) The satellite signal receiver sends satellite locking signals to the computer through the interface unit, and the computer judges whether the number of the locked satellites is more than or equal to 4; if yes, executing the step 4); if not, adjusting the position of the receiving antenna and returning to the step 2);
4) The satellite signal receiver sends a satellite locking signal and a received 1PPS second pulse signal to the main control unit through the interface unit, and the satellite signal receiver sends a received B time code signal to the B code demodulation unit through the interface unit;
5) B code demodulation unit sends B time code signal after error correction or phase self-adaption to main control unit through interface unit, and updates data once per second;
the main control unit outputs the received B time code signal to the time sequence machine and the delay PLL unit, completes the forming, precision alignment and delay output control logic of the AC/DC B time code in the time sequence machine and the delay PLL unit, and then outputs the B time code signal to the tested equipment through the B time code output interface of the interface unit;
the main control unit outputs the received 1PPS second pulse signal to the tested equipment through the interface unit;
the main control unit receives a clock signal output by the temperature compensation crystal oscillator, divides the frequency of the clock signal to be used as a counter, and the frequency after frequency division is not lower than 100MHz; calculating microsecond value of the moment of receiving the pulse signal through the count value, wherein the resolution is not lower than 0.1ms; the count value is cleared by a 1PPS second pulse signal every second;
6) The tested equipment receives the B time code signal and the 1PPS second pulse signal and then performs time synchronization, and after the synchronization is completed, the tested equipment is disconnected with the interface unit;
after the tested equipment independently operates for a set time, connecting a signal output interface to be tested of the tested equipment with a test interface of the interface unit; the tested equipment sends the signal to be tested to the main control unit;
7) The main control unit records the arrival time of the signal to be detected, reads the B time code of the signal to be detected to obtain the information of the day, the time, the minute and the second of the time, and reads the count value of the counter to obtain the microsecond information of the time; the main control unit sends the obtained time information to the computer through the interface unit;
8) The computer tests the time keeping precision of the tested equipment:
if the signal to be measured is a 1PPS second pulse signal, the day, time, minute and second values of the time information read by the computer are consistent with those of the tested equipment, and the microsecond value of the time information read by the computer is the time keeping precision of the tested equipment;
if the signal to be measured is a pulse signal of non-1 PPS second, the day, time, minute and second values of the time information read by the computer are consistent with those of the tested equipment, and the absolute value of the difference between the microsecond value of the time information read by the computer and the microsecond value of the signal to be measured is the time keeping precision of the tested equipment.
6. The satellite time service system-based time keeping precision testing method according to claim 5, wherein the method comprises the following steps: the time keeping accuracy is the maximum value after repeating the test three times.
7. The satellite time service system-based time keeping precision testing method according to claim 5, wherein the method comprises the following steps:
the PPS second pulse precision of the satellite signal receiver is higher than 10ns, the pulse width is 100+/-10 ms, and the satellite locking time is less than 1 minute;
the interface unit is provided with an RS422 input/output interface, an RS232 input/output interface, an LVDS input/output interface and an SMA input/output interface; and the delay time of the SMA input-output interface is less than 5ns.
8. The satellite time service system-based time keeping precision testing method according to claim 5, wherein the method comprises the following steps:
the working frequency of the temperature compensation crystal oscillator is higher than 10MHz, the frequency temperature stability is +/-5 ppm, and the aging rate is +/-5 ppm/year;
the satellite signal receiver, the interface unit, the B code demodulation unit, the main control unit, the time sequence machine, the time delay PLL unit and the temperature compensation crystal oscillator are packaged in the electric cabinet.
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| CN109633700B (en) * | 2018-12-03 | 2022-11-22 | 天津津航计算技术研究所 | Method for testing time service precision of multiple GPS receivers |
| CN112098720B (en) * | 2020-07-27 | 2023-04-07 | 深圳市风云实业有限公司 | Device and method for testing clock precision and drift by utilizing satellite timekeeping |
| CN112261283B (en) * | 2020-09-08 | 2022-11-08 | 北京微视新纪元科技有限公司 | Synchronous acquisition method, device and system of high-speed camera |
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