CN102931986B - A kind of method and apparatus reducing temperature coefficient and atomic frequency standard is affected - Google Patents
A kind of method and apparatus reducing temperature coefficient and atomic frequency standard is affected Download PDFInfo
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- CN102931986B CN102931986B CN201210423996.8A CN201210423996A CN102931986B CN 102931986 B CN102931986 B CN 102931986B CN 201210423996 A CN201210423996 A CN 201210423996A CN 102931986 B CN102931986 B CN 102931986B
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Abstract
The invention discloses a kind of method and apparatus reducing temperature coefficient and atomic frequency standard is affected, belong to field of atomic frequency standard.Described method comprises: measure operating ambient temperature during atomic frequency standard work; The described operating ambient temperature relatively recorded and the reference work temperature of described atomic frequency standard; Adopt the mathematic interpolation frequency compensation value of described operating ambient temperature and described reference work temperature; The output frequency of described frequency compensation value to described atomic frequency standard is adopted to compensate.Described device comprises: temperature measurement module, processing module and compensating module.The present invention by measuring operating ambient temperature during atomic frequency standard work, and according to the mathematic interpolation frequency compensation value of operating ambient temperature and reference work temperature, then to atomic frequency standard export compensate after export to user; Reduce the impact that ambient temperature change exports atomic frequency standard, ensure the stability that after powering on, atomic frequency standard exports.
Description
Technical field
The present invention relates to field of atomic frequency standard, particularly a kind of method and apparatus reducing temperature coefficient and atomic frequency standard is affected.
Background technology
Atomic frequency standard, as high stable, high-precision time synchronized source, is just being widely used in the various fields such as space flight, communication, national defense and military.These applications require that atomic frequency standard can adapt to the environment of various harshness, especially working temperature.Because the change of working temperature will cause the change of the core component working temperatures such as atomic frequency standard interior lamp temperature, chamber temperature, causes the instability of atomic hyperfine 0-0 jump frequency, finally affect the stability of rate-adaptive pacemaker.In fact, these are all the negative effects that the temperature coefficient of atomic frequency standard brings.
For overcoming the impact that temperature coefficient causes atomic frequency standard stability, atomic frequency standard is normally inserted in the environment of constant temperature by prior art, can improve the change of ambient temperature like this to the impact of atomic frequency standard stability.
Inventor is realizing in process of the present invention, finds that prior art at least exists following problem:
In field etc. during rugged environment work, be difficult to even not provide such isoperibol, cause atomic frequency standard to export unstable, be subject to the impact of ambient temperature.
Summary of the invention
In order to solve the problem of prior art, embodiments provide a kind of method and apparatus reducing temperature coefficient and atomic frequency standard is affected.Described technical scheme is as follows:
On the one hand, embodiments provide a kind of method reducing temperature coefficient and affect atomic frequency standard, described method comprises:
Measure operating ambient temperature during atomic frequency standard work;
The described operating ambient temperature relatively recorded and the reference work temperature of described atomic frequency standard, described reference work temperature is the ambient temperature after stablizing after atomic frequency standard powers on;
When described operating ambient temperature is not equal to the reference work temperature of described atomic frequency standard, adopt the mathematic interpolation frequency compensation value of described operating ambient temperature and described reference work temperature, frequency compensation value according to following formulae discovery: the absolute value of frequency compensation value=temperature coefficient * output frequency * difference, when described temperature coefficient refers to that the operating ambient temperature of described atomic frequency standard often changes 1 DEG C, the changing value of the output frequency of the described atomic frequency standard caused and the ratio of the output frequency of actual described atomic frequency standard;
The output frequency of described frequency compensation value to described atomic frequency standard is adopted to compensate;
The output frequency of described employing described frequency compensation value to described atomic frequency standard compensates, and comprising:
When the reference work temperature of described operating ambient temperature higher than described atomic frequency standard, described output frequency numerical value is deducted described frequency compensation value; When the reference work temperature of described operating ambient temperature lower than described atomic frequency standard, described output frequency numerical value is added described frequency compensation value.
Further, the output frequency of described employing described frequency compensation value to described atomic frequency standard compensates, and comprising: adopt the output frequency of Direct Digital Synthesizer to described atomic frequency standard to compensate.
Further, operating ambient temperature during described measurement atomic frequency standard work, comprising:
Measure the temperature of the multiple spot on the outer casing inner wall of described atomic frequency standard, and calculate the mean value of the temperature of described multiple spot, as described operating ambient temperature.
On the other hand, the embodiment of the present invention additionally provides a kind of device reducing temperature coefficient and affect atomic frequency standard, and described device comprises:
Temperature measurement module, for measuring operating ambient temperature during atomic frequency standard work;
Processing module, for comparing the reference work temperature of described operating ambient temperature and the described atomic frequency standard recorded, when described operating ambient temperature is not equal to the reference work temperature of described atomic frequency standard, adopt the mathematic interpolation frequency compensation value of described operating ambient temperature and described reference work temperature, frequency compensation value according to following formulae discovery: the absolute value of frequency compensation value=temperature coefficient * output frequency * difference, when described temperature coefficient refers to that the operating ambient temperature of described atomic frequency standard often changes 1 DEG C, the changing value of the output frequency of the described atomic frequency standard caused and the ratio of the output frequency of actual described atomic frequency standard,
Compensating module, for when the reference work temperature of described operating ambient temperature higher than described atomic frequency standard, deducts described frequency compensation value by described output frequency numerical value; When the reference work temperature of described operating ambient temperature lower than described atomic frequency standard, described output frequency numerical value is added described frequency compensation value.
Further, described temperature measurement module is made up of several thermistors, and described thermistor is affixed on described atomic frequency standard outer casing inner wall respectively.
Further, described compensating module comprises Direct Digital Synthesizer.
Further, described processing module comprises microprocessor.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
By measuring operating ambient temperature during atomic frequency standard work, and according to the mathematic interpolation frequency compensation value of operating ambient temperature and reference work temperature, then to atomic frequency standard export compensate after export to user; Reduce the impact that ambient temperature change exports atomic frequency standard, ensure the stability that after powering on, atomic frequency standard exports.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the method flow diagram that reduction temperature coefficient that the embodiment of the present invention one provides affects atomic frequency standard;
Fig. 2 is the apparatus structure schematic diagram that reduction temperature coefficient that the embodiment of the present invention two provides affects atomic frequency standard;
Fig. 3 is the temperature measurement module structural representation that the embodiment of the present invention two provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment one
Embodiments provide a kind of method reducing temperature coefficient and affect atomic frequency standard, see Fig. 1, the method comprises:
Step 100: measure operating ambient temperature during atomic frequency standard work.
Particularly, this step comprises: the temperature measuring the multiple spot on the outer casing inner wall of atomic frequency standard, and calculates the mean value of the temperature of multiple spot, as operating ambient temperature.
In specific implementation, can several thermistors be affixed on atomic frequency standard outer casing inner wall respectively, for measuring outer casing inner wall temperature during atomic frequency standard work.For improving certainty of measurement, the thermistor that usage quantity of can trying one's best during design is many, gets its mean value during calculating.
With the housing of atomic frequency standard for cuboid, 6 thermosensitive resistance measurements are adopted to be example (as shown in Figure 3): to be affixed on the inwall in 6 faces of atomic frequency standard structure shell by these 6 thermistors respectively.When the outer casing inner wall temperature T of atomic frequency standard work changes, the resistance of 6 thermistors also can change, get its mean value and just can obtain corresponding resistance R, " the temperature T-resistance R " indicatrix provided by thermistor production firm just can set up data transaction relation, obtain Temperature numerical thus, repeat no more here and how to obtain temperature according to resistance.
Step 200: the reference work temperature comparing operating ambient temperature and the atomic frequency standard recorded; Reference work temperature be atomic frequency standard power on stable after ambient temperature.
Wherein, atomic frequency standard powers on to stablize generally needs, through 3-5 hour, to be recorded the value of reference work temperature after stable by the thermistor be affixed on atomic frequency standard structure shell.
If operating ambient temperature is equal with the reference work temperature of atomic frequency standard, then illustrate that external environment does not impact operating ambient temperature, need not compensate.
Step 300: when operating ambient temperature is not equal to the reference work temperature of atomic frequency standard, adopts the mathematic interpolation frequency compensation value of operating ambient temperature and reference work temperature.
Particularly, according to following formulae discovery frequency compensation value:
The absolute value of frequency compensation value=temperature coefficient * output frequency * difference.
In the present embodiment, the temperature coefficient of atomic frequency standard refers to, when the operating ambient temperature of atomic frequency standard often changes 1 DEG C, and the changing value of the atomic frequency standard output frequency caused and the ratio of actual atomic frequency standard output frequency.
If the temperature coefficient of atomic frequency standard system is+1E-12 (known), namely operating ambient temperature often raises 1 DEG C of change that will cause atomic frequency standard system output signal fo frequency stability that+1E-12 magnitude occurs, i.e. f/fo=+1E-12.So, for fo=10MHz, difference is 1, then f=(+1E-5) Hz=10 μ Hz, and microprocessor needs correction fo being carried out to (-1E-5) Hz=-10 μ Hz.
Step 400: adopt the output frequency of frequency compensation value to atomic frequency standard to compensate.
Particularly, when the reference work temperature of operating ambient temperature higher than atomic frequency standard, output frequency numerical value is deducted frequency compensation value; When the reference work temperature of operating ambient temperature lower than atomic frequency standard, output frequency numerical value is added frequency compensation value.
Further, DDS (Direct Digital Synthesizer, Direct Digital Synthesizer) is adopted to compensate the output frequency of atomic frequency standard.
Below by for the DDS chip of AD9854, illustrate and how to adopt the output frequency of DDS to atomic frequency standard to compensate.
Such as, when carrying out frequency compensation, the fo=10MHz that atomic frequency standard exports is delivered to the time base reference edge of DDS, and DDS carries out 2 process of frequency multiplication to it in inside, i.e. the frequency of DDS real work is 20MHz.
Microprocessor, according to the Control timing sequence of DDS, exports corresponding level signal and acts on DDS its output frequency is changed, and carries out " 0 " simultaneously, " 1 " fills according to said frequencies offset to 48 bit frequency registers of DDS inside.In this 48 bit frequency register, if microprocessor is to its 48 whole sets, under the timing control signal of then DDS microprocessor, the frequency of 20MHz will be exported, same reason, if microprocessor is to its 48 whole resets, then under the timing control signal of DDS microprocessor, the frequency of 0MHz will be exported.
So, when in step 300, the frequency values that atomic frequency standard exports is 10MHz, the temperature coefficient of atomic frequency standard is+1E-12, temperature detecting module is sent to the atomic frequency standard operating ambient temperature of microprocessor and the difference of atomic frequency standard reference work temperature is 1, so now microprocessor needs to carry out negative-feedback process to DDS, namely carries out 10MHz-10 μ Hz FREQUENCY CONTROL to DDS and exports.For AD9854, when need not inner phase-locked loop time, its minimum frequency resolution is 10MHz/2
48≈ (4E-8) Hz.So, export the frequency signal of 10MHz-10 μ Hz, then the value of corresponding 48 bit frequency registers should be (10MHz-10 μ Hz) * 2
48/ 20MHz ≈ 140737488355187 (d)=7FFFFFFFFF73 (h)=11111111111111111111111111111111111111101110011 (b), microprocessor is under DDS timing control signal, by 48 bit frequency control words write DDS in, DDS then the revised frequency signal of corresponding output to user side.
The embodiment of the present invention by measuring operating ambient temperature during atomic frequency standard work, and according to the mathematic interpolation frequency compensation value of operating ambient temperature and reference work temperature, then to atomic frequency standard export compensate after export to user; Reduce the impact that ambient temperature change exports atomic frequency standard, ensure the stability that after powering on, atomic frequency standard exports.
Embodiment two
Embodiments provide a kind of device reducing temperature coefficient and affect atomic frequency standard, see Fig. 2, this device comprises:
Temperature measurement module 2, for measuring operating ambient temperature when atomic frequency standard 1 works;
Processing module 3, compares the reference work temperature of operating ambient temperature and the atomic frequency standard recorded, and when operating ambient temperature is not equal to the reference work temperature of atomic frequency standard, adopts the mathematic interpolation frequency compensation value of operating ambient temperature and reference work temperature;
Compensating module 4, compensates for adopting the output frequency of frequency compensation value to atomic frequency standard 1.
Wherein, see Fig. 3, temperature measurement module 2 is made up of several thermistors 20, and above-mentioned thermistor 20 is affixed on atomic frequency standard 1 outer casing inner wall respectively, for measuring outer casing inner wall temperature when atomic frequency standard 1 works.Corresponding with it, it is the functional module of temperature value that temperature measurement module 2 also comprises the numbers translate that above-mentioned thermistor 20 records.
Preferably, compensating module 4 comprises DDS, and DDS model can be AD9854.
Preferably, processing module 3 comprises microprocessor.
What deserves to be explained is, above-mentioned microprocessor 3 is also for the Traditional control to atomic frequency standard 1.
The embodiment of the present invention by measuring operating ambient temperature during atomic frequency standard work, and according to the mathematic interpolation frequency compensation value of operating ambient temperature and reference work temperature, then to atomic frequency standard export compensate after export to user; Reduce the impact that ambient temperature change exports atomic frequency standard, ensure the stability that after powering on, atomic frequency standard exports.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. reduce the method that temperature coefficient affects atomic frequency standard, it is characterized in that, described method comprises:
Measure operating ambient temperature during atomic frequency standard work;
The reference work temperature of the described operating ambient temperature relatively recorded and described atomic frequency standard, described reference work temperature is that atomic frequency standard powers on the ambient temperature after stablizing;
When described operating ambient temperature is not equal to described reference work temperature, adopt the mathematic interpolation frequency compensation value of described operating ambient temperature and described reference work temperature, frequency compensation value according to following formulae discovery: the absolute value of frequency compensation value=temperature coefficient * output frequency * difference, when described temperature coefficient refers to that the operating ambient temperature of described atomic frequency standard often changes 1 DEG C, the changing value of the output frequency of the described atomic frequency standard caused and the ratio of the output frequency of actual described atomic frequency standard;
The output frequency of described frequency compensation value to described atomic frequency standard is adopted to compensate;
The output frequency of described employing described frequency compensation value to described atomic frequency standard compensates, and comprising:
When the reference work temperature of described operating ambient temperature higher than described atomic frequency standard, described output frequency numerical value is deducted described frequency compensation value; When the reference work temperature of described operating ambient temperature lower than described atomic frequency standard, described output frequency numerical value is added described frequency compensation value.
2. method according to claim 1, is characterized in that, the output frequency of described employing described frequency compensation value to described atomic frequency standard compensates, and comprising:
The output frequency of Direct Digital Synthesizer to described atomic frequency standard is adopted to compensate.
3. method according to claim 1, is characterized in that, operating ambient temperature during described measurement atomic frequency standard work, comprising:
Measure the temperature of the multiple spot on the outer casing inner wall of described atomic frequency standard, and calculate the mean value of the temperature of described multiple spot, as described operating ambient temperature.
4. reduce the device that temperature coefficient affects atomic frequency standard, it is characterized in that, described device comprises:
Temperature measurement module (2), for measuring operating ambient temperature during atomic frequency standard (1) work;
Processing module (3), for comparing the reference work temperature of described operating ambient temperature and the described atomic frequency standard recorded, when described operating ambient temperature is not equal to the reference work temperature of described atomic frequency standard, adopt the mathematic interpolation frequency compensation value of described operating ambient temperature and described reference work temperature, frequency compensation value according to following formulae discovery: the absolute value of frequency compensation value=temperature coefficient * output frequency * difference, when described temperature coefficient refers to that the operating ambient temperature of described atomic frequency standard often changes 1 DEG C, the changing value of the output frequency of the described atomic frequency standard caused and the ratio of the output frequency of actual described atomic frequency standard,
Compensating module (4), for when the reference work temperature of described operating ambient temperature higher than described atomic frequency standard, deducts described frequency compensation value by described output frequency numerical value; When the reference work temperature of described operating ambient temperature lower than described atomic frequency standard, described output frequency numerical value is added described frequency compensation value.
5. device according to claim 4, is characterized in that, described temperature measurement module (2) is made up of several thermistors (20), and described thermistor is affixed on described atomic frequency standard (1) outer casing inner wall respectively.
6. device according to claim 4, is characterized in that, described compensating module (4) comprises Direct Digital Synthesizer.
7. device according to claim 4, is characterized in that, described processing module (3) comprises microprocessor.
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| CN106571810B (en) * | 2016-10-21 | 2020-02-07 | 北京无线电计量测试研究所 | Temperature coefficient compensation device and method for atomic frequency standard equipment |
| CN106571809B (en) * | 2016-10-21 | 2020-04-07 | 北京无线电计量测试研究所 | Temperature coefficient compensation device and method for atomic frequency standard equipment |
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