CN211180593U - Time frequency detection equipment - Google Patents
Time frequency detection equipment Download PDFInfo
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- CN211180593U CN211180593U CN201922295064.XU CN201922295064U CN211180593U CN 211180593 U CN211180593 U CN 211180593U CN 201922295064 U CN201922295064 U CN 201922295064U CN 211180593 U CN211180593 U CN 211180593U
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Abstract
The utility model discloses a time frequency detection device, which comprises a time frequency source autonomous calibration system, a time signal test system, a frequency signal test system and a data transmission system; the beneficial effects of the utility model reside in that: the time frequency detection device of the utility model integrates time measurement and frequency measurement functions, has small measurement noise, high precision and strong stability, and adopts a high-precision reference source to realize effective measurement of a measured signal; the portable detection equipment can be realized, the structure is simple and reliable, and the measurement requirement on the frequency in most engineering application scenes can be met.
Description
Technical Field
The utility model belongs to the technical field of the time frequency detection, especially, relate to time frequency detection equipment.
Background
The time signal and the frequency signal are the most basic elements of all current electronic systems, and all programs, actions and instructions are orderly carried out depending on the time signal and the frequency signal. With the great promotion of the time-frequency system construction in China, various time-frequency devices are widely applied. How to quickly and effectively measure, calibrate and calibrate the function and performance parameters of the equipment becomes a prominent problem.
The detected equipment is generally required to be sent to a detection mechanism in a physical form, or the detection mechanism carries a plurality of pieces of reference equipment to be calibrated off-site; meanwhile, the detection equipment is complex in type and volume. This has influenced inspection efficiency to a great extent, has indirectly promoted time cost, capital cost and the human cost of being proofreaded the unit, has caused social resource waste.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is to provide a time-frequency detection device for solving the above problems, which comprises a time-frequency source autonomous calibration system, a time signal test system, a frequency signal test system and a data transmission system;
the time-frequency source autonomous calibration system comprises a positioning data receiver, a time calibration unit, a frequency calibration unit and an atomic clock;
the time signal testing system is used for time difference measurement and time signal precision and integrity measurement;
the frequency signal test system is used for measuring the accuracy and stability of external signals;
the data transmission system is used for processing and outputting equipment test data;
the positioning data receiver is connected with the input end of the frequency calibration unit and the input end of the time calibration unit; the time calibration unit and the frequency calibration unit are respectively connected with the atomic clock; the time calibration unit is connected with the time signal testing system; the atomic clock is connected with the frequency signal testing system;
and the time signal test system and the frequency signal test system are respectively connected with the data transmission system.
The utility model discloses a following technical scheme realizes above-mentioned purpose: the beneficial effects of the utility model reside in that: the time frequency detection device of the utility model integrates time measurement and frequency measurement functions, has small measurement noise, high precision and strong stability, and adopts a high-precision reference source to realize effective measurement of a measured signal; the portable detection equipment can be realized, the structure is simple and reliable, and the measurement requirement on the frequency in most engineering application scenes can be met.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a schematic diagram of a time scaling unit;
FIG. 3 is a schematic diagram of a frequency scaling unit;
FIG. 4 is a schematic diagram of a time signal testing system;
FIG. 5 is a schematic diagram of a frequency signal testing system;
FIG. 6 is a schematic diagram of a data transmission system;
FIG. 7 is a simulation plot of frequency accuracy;
FIG. 8 is a simulation plot of time accuracy;
fig. 9 is a simulation diagram of the frequency measurement resolution.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1, the time-frequency detection device of the present invention comprises a time-frequency source autonomous calibration system, a time signal testing system, a frequency signal testing system, and a data transmission system; the time-frequency source autonomous calibration system comprises a positioning data receiver, a time calibration unit, a frequency calibration unit and an atomic clock; the time signal testing system is used for time difference measurement and time signal precision and integrity measurement; the frequency signal test system is used for measuring the accuracy and stability of external signals; the data transmission system is used for processing and outputting equipment test data; the positioning data receiver is connected with the input end of the frequency calibration unit and the input end of the time calibration unit; the time calibration unit and the frequency calibration unit are respectively connected with the atomic clock; the time calibration unit is connected with the time signal testing system; the atomic clock is connected with the frequency signal testing system; and the time signal test system and the frequency signal test system are respectively connected with the data transmission system.
Furthermore, the time calibration unit comprises a first time difference measurement module, a first time-frequency processing module, a data processing unit and a phase trimmer; the first time difference measuring module and the phase fine adjuster are respectively connected with the first time-frequency processing module; the first time frequency processing module is connected with the atomic clock, the positioning data receiver and the data processing unit; the data processing unit is connected with the positioning data receiver.
Furthermore, the frequency calibration unit comprises a second time-frequency processing module connected with the atomic clock and the positioning data receiver.
Furthermore, the time signal testing system comprises a third time frequency processing module, a second time difference measuring module, a time code comparison module, a time code decoding module and a B code decoding module; the time code decoding module and the B code decoding module are respectively connected with the time code comparison module; and the time code comparison module and the second time difference measurement module are respectively connected with the third time frequency processing module.
Furthermore, the frequency signal testing system comprises a first analog-to-digital converter, a second analog-to-digital converter, a first mixer, a second mixer, a local vibration source, a first low-pass filter, a second low-pass filter, a phase comparator, an accuracy calculating module and a stability calculating module; the first analog-to-digital converter, the first frequency mixer and the first low-pass filter are sequentially connected; the second analog-to-digital converter, the second frequency mixer and the second low-pass filter are connected in sequence; the local vibration source is respectively connected with the first frequency mixer and the second frequency mixer; the output end of the first low-pass filter and the output end of the second low-pass filter are respectively connected with the input end of the phase comparator; the output end of the phase comparator is connected with the accuracy calculation module and the stability processing module; the accuracy calculation module and the stability processing module are respectively connected with the data transmission system.
Further, as shown in fig. 6, the data transmission system includes a data processor, a time data serial interface, a frequency data serial interface, and a network interface chip; the input end of the data processor is respectively connected with the time signal testing system and the frequency signal testing system; and the output end of the data processor is respectively connected with the time data serial interface, the frequency data serial interface and the network port chip.
The time-frequency source autonomous calibration system is used for calibrating and calibrating the time reference and the frequency reference of the equipment. Thereby enabling the device to have a reference source of sufficient accuracy to enable efficient measurement of the signal under test.
The atomic clock adopts a rubidium atomic clock; the positioning data receiver adopts a GNSS receiver based on a global navigation positioning system such as Beidou, GPS, Grollas, Galileo and other positioning systems.
As shown in fig. 2, the time calibration unit is provided with a high-performance atomic clock, and can smooth the receiver time and suppress short-term fluctuation by using the characteristic of good stability of the atomic clock in the medium and short periods, so that the system deviation caused by the ionosphere, the troposphere, the multipath effect and the like can be suppressed; timing accuracy better than 10ns can be achieved.
The GNSS receiver outputs 1PPS second pulse drift characteristics to trace the ground atomic clock group, and has the characteristic of good long-term stability. As shown in fig. 3, the frequency calibration unit can calibrate the frequency of the atomic clock by measuring and correcting the clock drift of the atomic clock. The utility model discloses an accuracy 1 hour correctable to 1e (-11) magnitude, 24 hours correctable to 1e (-12) magnitude, satisfy the requirement of most test scenario.
As shown in fig. 4, the time signal testing system uses the internal time of the device as a reference, and completes time difference measurement and recording between the external 1PPS signal to be tested and the local 1PPS signal, and judges whether the external 1PPS + TOD information is intact, continuous or accurate, and decodes the external IRIG-B code.
As shown in fig. 5, the frequency signal testing system takes the internal frequency signal of the device as a reference to complete the measurement of the accuracy and stability of the externally input 10 MHz. The low frequency beat signal can be obtained by the common oscillator output. Taking 10MHz signal input as an example, the frequency can be 9.999MHz, so that a beat signal of 1KHz can be obtained. The error multiplication factor a is 104. In the prior engineering, the actual time difference measurement level can reach 1ns, namely about 1e (-9) s, so that after error multiplication, the corresponding equivalent phase measurement resolution reaches 1e (-13) level. The resolution of the frequency accuracy of the device is 1e (-13) magnitude, the corresponding second-level stability is also e (-13) magnitude, and the device meets the measurement requirements of most engineering application scenes on the frequency. FIG. 7 is a simulation diagram of frequency reference calibration, in which the horizontal axis represents time and the vertical axis represents frequency, and the frequency mean value reaches 2.34e (-13) Hz; FIG. 8 is a simulation diagram showing the synchronization accuracy between the local time and the standard UTC time, with the horizontal axis; FIG. 9 is a simulation of the frequency measurement resolution with time on the horizontal axis and frequency variance on the vertical axis; the frequency measurement precision of the time frequency detection equipment can reach e (-14) magnitude.
The data transmission system is used for outputting the internal test data of the equipment in real time, and the output interface is compatible with the network port and the serial port.
The time frequency detection device of the utility model integrates time measurement and frequency measurement functions, has small measurement noise, high precision and strong stability, and adopts a high-precision reference source to realize effective measurement of a measured signal; the portable detection equipment can be realized, the structure is simple, the size is small, and the measurement requirement on the frequency in most engineering application scenes can be met.
The technical scheme of the utility model is not limited to the restriction of above-mentioned specific embodiment, all according to the utility model discloses a technical scheme makes technical deformation, all falls into within the protection scope of the utility model.
Claims (6)
1. The time frequency detection equipment is characterized by comprising a time frequency source autonomous calibration system, a time signal test system, a frequency signal test system and a data transmission system;
the time-frequency source autonomous calibration system comprises a positioning data receiver, a time calibration unit, a frequency calibration unit and an atomic clock;
the time signal testing system is used for time difference measurement and time signal precision and integrity measurement;
the frequency signal test system is used for measuring the accuracy and stability of external signals;
the data transmission system is used for processing and outputting equipment test data;
the positioning data receiver is connected with the input end of the frequency calibration unit and the input end of the time calibration unit; the time calibration unit and the frequency calibration unit are respectively connected with the atomic clock; the time calibration unit is connected with the time signal testing system; the atomic clock is connected with the frequency signal testing system;
and the time signal test system and the frequency signal test system are respectively connected with the data transmission system.
2. The time-frequency detection device according to claim 1, wherein the time calibration unit comprises a first time difference measurement module, a first time-frequency processing module, a data processing unit and a phase fine-tuning unit; the first time difference measuring module and the phase fine adjuster are respectively connected with the first time-frequency processing module; the first time frequency processing module is connected with the atomic clock, the positioning data receiver and the data processing unit; the data processing unit is connected with the positioning data receiver.
3. The time-frequency detection device according to claim 1, wherein the frequency scaling unit comprises a second time-frequency processing module connected to the atomic clock and the positioning data receiver.
4. The time frequency detection device according to claim 1, wherein the time signal testing system comprises a third time frequency processing module, a second time difference measuring module, a time code comparison module, a time code decoding module and a B code decoding module; the time code decoding module and the B code decoding module are respectively connected with the time code comparison module; and the time code comparison module and the second time difference measurement module are respectively connected with the third time frequency processing module.
5. The time-frequency detection device according to claim 1, wherein the frequency signal testing system comprises a first analog-to-digital converter, a second analog-to-digital converter, a first mixer, a second mixer, a local oscillator, a first low-pass filter, a second low-pass filter, a phase comparator, an accuracy calculating module and a stability calculating module; the first analog-to-digital converter, the first frequency mixer and the first low-pass filter are sequentially connected; the second analog-to-digital converter, the second frequency mixer and the second low-pass filter are connected in sequence; the local vibration source is respectively connected with the first frequency mixer and the second frequency mixer; the output end of the first low-pass filter and the output end of the second low-pass filter are respectively connected with the input end of the phase comparator; the output end of the phase comparator is connected with the accuracy calculation module and the stability processing module; the accuracy calculation module and the stability processing module are respectively connected with the data transmission system.
6. The time-frequency detection device according to claim 1, wherein the data transmission system comprises a data processor, a time data serial interface, a frequency data serial interface, and a network interface chip; the input end of the data processor is respectively connected with the time signal testing system and the frequency signal testing system; and the output end of the data processor is respectively connected with the time data serial interface, the frequency data serial interface and the network port chip.
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| CN201922295064.XU CN211180593U (en) | 2019-12-19 | 2019-12-19 | Time frequency detection equipment |
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| CN201922295064.XU CN211180593U (en) | 2019-12-19 | 2019-12-19 | Time frequency detection equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113805461A (en) * | 2021-09-16 | 2021-12-17 | 中国电子科技集团公司第五十四研究所 | Time-frequency link end node 1pps signal transmission delay measuring method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113805461A (en) * | 2021-09-16 | 2021-12-17 | 中国电子科技集团公司第五十四研究所 | Time-frequency link end node 1pps signal transmission delay measuring method |
| CN113805461B (en) * | 2021-09-16 | 2022-08-02 | 中国电子科技集团公司第五十四研究所 | Time-frequency link end node 1pps signal transmission time delay measuring method |
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