CN209486181U - A kind of system of accurate measurement frequency - Google Patents
A kind of system of accurate measurement frequency Download PDFInfo
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- CN209486181U CN209486181U CN201822054598.9U CN201822054598U CN209486181U CN 209486181 U CN209486181 U CN 209486181U CN 201822054598 U CN201822054598 U CN 201822054598U CN 209486181 U CN209486181 U CN 209486181U
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Abstract
The utility model discloses a kind of systems of accurate measurement frequency, including satellite time transfer receiver, with reference to frequency marking, frequency measuring instrument, time difference measurement instrument and computer, the satellite time transfer receiver receives the time signal of GNSS system by antenna, and the satellite time transfer receiver and the 1PPS pulse signal that exports respectively with reference to frequency marking send to the input terminal of time difference measurement instrument the measurement for carrying out the time difference；The measurement input terminal of the frequency measuring instrument is for connecting measured frequency signal, the frequency standard signal that the reference input connection of the frequency measuring instrument is exported with reference to frequency marking；The measured value of the time difference measurement instrument and the measurement data of the frequency measuring instrument are respectively sent to carry out data processing in computer, obtain the accurate measurements of frequency.The utility model is good using local frequency marking short run target, measures certain features, in conjunction with the high feature of the long-term accuracy index of GNSS system, realizes test quick to frequency, accurate, high-level, inexpensive.
Description
Technical field
The utility model belongs to frequency measurement the field of test technology, and in particular to a kind of system of accurate measurement frequency.
Background technique
Frequency measurement really carries out multiple repairing weld to by measured frequency within the sampling time, ties using average value as measurement
Fruit.There are many methods, such as direct measurement frequency method, opposite reference frequency measurement frequency difference method for measurement frequency.No matter such as
What measurement frequency will have a reference frequency standard, referred to as refer to frequency marking, the standard as measurement.The standard of reference standard
True property, stability all determine the level of measurement result.In addition to this, the sampling time is also key factor, the usual sampling time
Longer, measurement result is truer.
The frequency marking of high precision is expensive in actual operation, is difficult to obtain, use, maintenance it is costly, using having not more
Just；Sampling time is too long will to be difficult to complete largely to test, be difficult to realize complete quickly test within ten seconds to hundreds of seconds time.
And in actual operation, the frequency marking of cheap high accuracy, often tames cheap frequency marking using GNSS in order to obtain
Method, obtain high frequency accuracy.But the noise due to taming frequency marking is big, frequency instantaneous value is unstable, it is necessary to pass through
It crosses after filtering for a long time, being smooth, calculates output frequency value of the average value as frequency marking, this process generally will then count small less
When, more then tens of hours, can just be stablized, reliable result.
Summary of the invention
In view of the drawbacks of the prior art with deficiency, the utility model by providing a kind of system of accurate measurement frequency,
The feature stable with local standard frequency marking short run target, measurement is reliable, measuring speed is fast, and it is long-term to combine GNSS to tame frequency marking
The accurate feature of index proposes the frequency Accurate measurement based on the local frequency marking of GNSS amendment to solve the above technical problems.
To achieve the above object, the technical solution of the utility model are as follows:
A kind of system of accurate measurement frequency, including satellite time transfer receiver, with reference to frequency marking, frequency measuring instrument, the time difference survey
Instrument and computer are measured, the satellite time transfer receiver receives the time signal of GNSS system, the satellite time transfer by antenna
Receiver and the 1PPS pulse signal that exports respectively with reference to frequency marking send to the input terminal of time difference measurement instrument the survey for carrying out the time difference
Amount；The measurement input terminal of the frequency measuring instrument is for connecting measured frequency signal, the reference input of the frequency measuring instrument
Frequency standard signal of the end connection with reference to frequency marking output；The measured value of the time difference measurement instrument and the measurement number of the frequency measuring instrument
According to being respectively sent to carry out data processing in computer, the accurate measurements of frequency are obtained.
Preferably, the reference frequency marking is Rb atom frequency marking.
Preferably, the reference frequency marking is crystal oscillator frequency marking.
Reference signal using local frequency marking as frequency measurement measures local reference using the 1PPS signal of GNSS for a long time
The error of frequency marking obtains the local correction value for referring to frequency marking, the result of frequency of amendment measuring instrument measurement at any time.
Compared with prior art, the advantages of the utility model:
(1) the characteristics of the utility model has played that local frequency marking noise is low, short-term stability is good, and measurement is fast, high reliablity,
The high feature of GNSS system long term time frequency accuracy has been played simultaneously, has been modified using result of the correction value to measurement,
Obtain more accurate measurement result.
(2) the utility model can determine the relative frequency difference of current local frequency marking, carry out to the measurement result of local frequency marking
Amendment.
(3) the utility model can tame frequency marking without using GNSS, without common-view mode, be used only GNSS receiver into
Row remote calibration local frequency, method is simple, at low cost practical.
(4) the utility model can be monitored the frequency difference of GNSS system and local frequency marking frequency for a long time, beyond expected hair
It prompts out.
(5) the utility model can to avoid it is expensive, use cumbersome advanced frequency marking.
(6) using the systematic survey speed of the utility model, fast, high reliablity, accuracy are high.
It can be seen that the feature that the utility model is good using local frequency marking short run target, measurement is reliable, measuring speed is fast,
In conjunction with the high feature of the long-term accuracy index of GNSS system, test quick to frequency, accurate, high-level, inexpensive is realized.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the principles of the present invention schematic diagram.
Specific embodiment
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
Embodiment 1
As shown in Figure 1, a kind of system of accurate measurement frequency, including satellite time transfer receiver, with reference to frequency marking, frequency measurement
Instrument, time difference measurement instrument and computer, the satellite time transfer receiver receive the time signal from GNSS system by antenna,
The satellite time transfer receiver and it is described exported respectively with reference to frequency marking 1PPS pulse signal send to the input terminal of time difference measurement instrument into
The measurement of row time difference；For the input terminal of the frequency measuring instrument for connecting tested frequency signal, the reference of the frequency meter is defeated
Enter end connection with reference to the frequency signal of frequency marking output；The measurement of the measured value and the frequency measuring instrument of the time difference measurement instrument
Data are respectively sent to computer and carry out data processing, obtain the accurate measurements of frequency.
Each component devices of the system are discussed in detail as follows respectively:
Satellite time transfer receiver: satellite time transfer receiver can receive GNSS (Global Navigation Satellite
System, i.e. Global Navigation Satellite System) system time signal, as the benchmark for calibrating local frequency marking, GNSS system includes
GPS system, BDS system etc.；Satellite time transfer receiver is capable of providing the 1PPS output of pulse signal of time dissemination system, is sent to time difference survey
It measures instrument input terminal and carries out time difference measurement with reference to the 1PPS signal of frequency marking.
With reference to frequency marking: being the reference frequency of whole system measurement frequency with reference to frequency marking, such as: Rb atom frequency marking, crystal oscillation
Device frequency marking etc. can provide measurement with reference to frequency marking for measurement frequency, while export 1PPS pulse signal and send to time difference measurement instrument
The 1PPS signal of input terminal and receiver carries out time difference measurement.
Frequency measuring instrument: the equipment can complete frequency measurement task, as frequency standard, to measure quilt with reference to frequency standard signal
The frequency values of measured frequency signal；The input terminal of frequency measuring instrument connects tested frequency signal, and reference input connection is with reference to frequency
Mark frequency signal.
Time difference measurement instrument: time difference measurement instrument is used to measure the 1PPS pulse signal of satellite time transfer receiver output and with reference to frequency
Mark the time difference of the 1PPS pulse signal of output；It time difference measurement instrument its time difference of long-term accumulated, is referred to by data processing
The difference on the frequency of frequency marking and GNSS system, and using this measurement result as the correction value for referring to frequency marking；Long-term real-time monitoring simultaneously
Prompt is issued when the accurate sexual deviation of reference frequency marking is expected with reference to the accuracy of frequency marking.
Computer: computer is as ancillary equipment for the measured value of clock synchronization difference measuring instrument, the measurement number of frequency measuring instrument
According to being handled, measurement result is obtained.
It is measured frequency or measured frequency marking is measured frequency signal or measured frequency standard signal.
Embodiment 2
The working principle of the system of the accurate measurement frequency is as follows:
In general, satellite time transfer receiver, time difference measurement instrument, be electrified for a long time with reference to frequency marking, using the measurement time difference method into
Row calibration measurement obtains the difference on the frequency with reference to frequency marking and GNSS system benchmark frequency marking by data processing, calculates whole system
Relative frequency difference when measurement frequency.Use this result as correction value, subsequent measurement is modified.And then it is sufficiently sharp
With only by measuring the characteristics of capable of just obtaining GNSS system high accuracy frequency signal for a long time；Typical method is sampled, is made
It is provided for frequency measuring instrument with reference to frequency marking with local with reference to frequency marking, the frequency values within the time of tens of seconds to hundreds of seconds are filled
Distribution waves the feature that local frequency marking noise is low, short-term stability is good, measuring speed is fast and completes rapid survey.Using correction value to survey
The result of amount is modified, and obtains more accurate measurement result.
Since local frequency marking is for a long time under the monitoring of GNSS system temporal frequency magnitude, local frequency marking magnitude always ensure that
Controlled, magnitude issues prompt when exceeding allowed band.
The system is generally electrified for a long time measurement, carries out data accumulation and processing, before to being measured by measured frequency, uses
The calibration measurement being accumulated by for a long time is as a result, determine the correction value of current reference frequency marking.The output resolution of frequency measuring instrument with
The relative frequency deviation of calibration measurement is adapted；With reference to the frequency stability of frequency marking and the output resolution of frequency marking frequency measuring instrument
It is adapted.
It is measured by the comparison of long-term, with reference to the relative error of frequency marking and GNSS system frequency marking are as follows:
Then by the frequency values of measured frequency are as follows:
fZ=fD=(1+ δC)
In formula:
δc: the relative deviation with reference to frequency marking with respect to GNSS system frequency marking；
fA: the frequency marking frequency values of GNSS system, Hz；
fC: with reference to the frequency values of frequency marking, Hz；
fD: the frequency values of frequency measuring instrument measurement output, Hz；
fZ: by the frequency values of measured frequency, Hz.
Although above having made detailed description to the utility model with generality explanation and specific embodiment,
On the basis of the utility model, it can be made some modifications or improvements, this is apparent to those skilled in the art
's.Therefore, these modifications or improvements on the basis of without departing from the spirit of the present invention, belong to the utility model and want
Seek the range of protection.
Claims (3)
1. a kind of system of accurate measurement frequency, it is characterised in that: including satellite time transfer receiver, with reference to frequency marking, frequency measurement
Instrument, time difference measurement instrument and computer, the satellite time transfer receiver receives the time signal of GNSS system by antenna, described
Satellite time transfer receiver and the 1PPS pulse signal that exports respectively with reference to frequency marking are sent to when the input terminal progress of time difference measurement instrument
Between poor measurement；The measurement input terminal of the frequency measuring instrument is used to connect measured frequency signal, the frequency measuring instrument
Frequency standard signal of the reference input connection with reference to frequency marking output；The measured value and the frequency measuring instrument of the time difference measurement instrument
Measurement data be respectively sent to computer.
2. the system of accurate measurement frequency according to claim 1, it is characterised in that: the reference frequency marking is rubidium atom frequency
Mark.
3. the system of accurate measurement frequency according to claim 1, it is characterised in that: the reference frequency marking is crystal oscillation
Device frequency marking.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821471840 | 2018-09-10 | ||
| CN2018214718406 | 2018-09-10 |
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| Publication Number | Publication Date |
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| CN209486181U true CN209486181U (en) | 2019-10-11 |
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| CN201822054598.9U Active CN209486181U (en) | 2018-09-10 | 2018-12-08 | A kind of system of accurate measurement frequency |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858780A (en) * | 2020-12-31 | 2021-05-28 | 广东大普通信技术有限公司 | Method, device and system for measuring crystal oscillation frequency |
| CN113848568A (en) * | 2021-09-24 | 2021-12-28 | 上海精密计量测试研究所 | Time correction system and method |
| US11774601B2 (en) * | 2021-02-23 | 2023-10-03 | Viavi Solutions Inc. | Satellite signal propagation delay test device |
-
2018
- 2018-12-08 CN CN201822054598.9U patent/CN209486181U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858780A (en) * | 2020-12-31 | 2021-05-28 | 广东大普通信技术有限公司 | Method, device and system for measuring crystal oscillation frequency |
| US11774601B2 (en) * | 2021-02-23 | 2023-10-03 | Viavi Solutions Inc. | Satellite signal propagation delay test device |
| CN113848568A (en) * | 2021-09-24 | 2021-12-28 | 上海精密计量测试研究所 | Time correction system and method |
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