CN110989325A - Digital servo device and using method - Google Patents
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- CN110989325A CN110989325A CN201911216194.8A CN201911216194A CN110989325A CN 110989325 A CN110989325 A CN 110989325A CN 201911216194 A CN201911216194 A CN 201911216194A CN 110989325 A CN110989325 A CN 110989325A
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Abstract
The invention discloses a digital servo device and a using method thereof, which solve the problems that the existing device and method can not automatically adjust the long-term stability index of a cesium atomic clock and improve the service life. The device is used for transmitting error signals output by the cesium atomic clock and the cesium beam tube to the microcontroller through the low-noise amplifier and the analog-digital converter; the microcontroller is used for outputting a frequency adjusting signal, a C field adjusting signal, a microwave power adjusting signal and an electronic voltage multiplier adjusting signal to the digital-to-analog converter; the digital-to-analog converter is used for receiving the adjusting signal, converting the adjusting signal into a digital signal and then sending the digital signal to a crystal oscillator of the cesium atomic clock; and the digital frequency synthesizer is used for receiving the clock signal output by the microcontroller and outputting a reference frequency signal, and the output reference frequency signal is used for generating an excitation signal of the cesium-beam tube. The method is used for the device. The invention can improve the long-term usability index of the cesium atomic clock and prolong the service life.
Description
Technical Field
The invention relates to the technical field of atomic frequency standards, in particular to a digital servo device and a using method thereof.
Background
The cesium atomic clock plays an important role in the time frequency field, becomes a first-level frequency standard and high-precision reference clock by virtue of the advantages of excellent long-term stability and high reliability, and is applied to various fields of modern science and technology, including timekeeping, time frequency measurement and the like. So far, the development of the small-sized cesium magnetic separation clock in China has not really reached the engineering application level, wherein the important reason that the index and the service life of the small-sized cesium magnetic separation clock are difficult to meet the engineering use requirement is that the circuit and the cesium beam tube are changed mainly due to the change of external environments (such as temperature, magnetic field and the like). The existing cesium atomic clock servo device cannot automatically adjust cesium beam tube parameters such as C field current, electronic voltage doubler voltage and the like, and cannot prolong the service life of a cesium atomic clock.
Disclosure of Invention
The invention provides a digital servo device and a using method thereof, and solves the problems that the existing device and method can not automatically adjust the power supply parameters of a cesium-beam tube, improve the long-term stability index of a cesium atomic clock and prolong the service life.
To achieve the above object, the present invention is realized by:
the embodiment of the invention provides a digital servo device, which is used for transmitting error signals output by a cesium atomic clock and a cesium beam tube to a microcontroller through a low-noise amplifier and an analog-digital converter; the microcontroller is used for outputting a regulating signal to the digital-to-analog converter: when the error signal is a master control loop error signal, the adjusting signal is a frequency adjusting signal generated according to the magnitude and direction of the error signal; when the error signal is a first C field error signal and a second C field error signal, the adjusting signal is a C field adjusting signal generated according to the comparison result of the first C field error signal and the second C field error signal, and the frequency of the first C field error signal and the frequency of the second C field error signal are input into the cesium-beam tube to be f0+△f、f0△ f, when the error signal is the first and the second power error signals, the adjusting signal is the microwave power adjusting signal generated according to the comparison result, the first and the second power error signals have power P from the input to the cesium beam tube0+△P、 P0△ P, when the error signal is an electronic voltage doubler error signal, the regulating signal is an electronic voltage doubler regulating signal generated according to the comparison result of the electronic voltage doubler error signal and a threshold level, and the electronic voltage doubler error signal is generated according to the comparison result of the electronic voltage doubler error signal and the threshold levelInput frequency of cesium-beam tube is f0Generating a microwave signal; the digital-to-analog converter is used for receiving the adjusting signal, converting the adjusting signal into a digital signal and then sending the digital signal to a crystal oscillator and a cesium-beam tube of the cesium atomic clock; the digital frequency synthesizer is used for receiving the clock signal output by the microcontroller and outputting a reference frequency signal, and the output reference frequency signal is used for generating an excitation signal of the cesium-beam tube; wherein f is0The center frequency of the cesium atom excitation signal is △ f is a preset frequency interval, P0For optimum microwave power, △ P is the power interval.
Further, the microcontroller includes: a main control loop module; and the main control loop module is used for outputting the frequency adjusting signal when the error signal is the main control loop error signal, wherein the size and the sign of the frequency adjusting signal are related to the size and the sign of the error signal.
Further, the microcontroller includes: a C field regulation loop module; and the C field adjusting loop module is used for outputting the C field adjusting signal for increasing or decreasing the C field current according to the comparison result of the first and second C field error signals when the error signals are the first and second C field error signals.
Further, the microcontroller includes: a power control loop module; and the power control loop module is used for outputting the microwave power adjusting signal for increasing or decreasing the microwave power according to the comparison result of the first power error signal and the second power error signal when the error signals are the first power error signal and the second power error signal.
Further, the microcontroller includes: an electronic voltage doubler control loop module; and the electronic voltage doubler control loop module is configured to, when the error signal is the electronic voltage doubler error signal, output the electronic voltage doubler adjustment signal for decreasing the electronic voltage doubler voltage if the electronic voltage doubler error signal is greater than the threshold level plus 1mV, and output the electronic voltage doubler adjustment signal for increasing the electronic voltage doubler voltage if the electronic voltage doubler error signal is less than the threshold level.
Preferably, the microcontroller is C8051F 064.
Preferably, the analog-to-digital converter adopts a 16-bit A/D chip, and the digital-to-analog converter adopts a 20-bit D/A chip.
Preferably, the digital frequency synthesizer is an AD9852, and the center frequency of the reference frequency signal is 7.368230 MHz.
The embodiment of the invention also provides a using method of the digital servo device, and the using method of the digital servo device comprises the following steps: receiving an error signal output by a cesium-beam tube, generating an adjusting signal after analog-to-digital conversion and loop adjustment, outputting after digital-to-analog conversion, and simultaneously outputting a reference frequency signal: when the error signal is the main control loop error signal, the adjusting signal is the frequency adjusting signal; when the error signals are the first and second C field error signals, the adjustment signal is the C field adjustment signal; when the error signals are the first and second power error signals, the adjustment signal is the microwave power adjustment signal; when the error signal is a first and second electronic voltage doubler error signal, the adjustment signal is the electronic voltage doubler adjustment signal; when the error signal is an electronic voltage doubler error signal, the adjusting signal is an electronic voltage doubler adjusting signal.
The beneficial effects of the invention include: the invention aims to develop a digital servo optimization device of a cesium atomic clock, which controls the frequency of a 10MHz crystal oscillator by using an error signal output by a cesium beam tube so as to lock a scanning signal to the central frequency of the cesium atomic clock. The C field current, the microwave power, the electron multiplier amplification and the like are all important factors influencing the output of the error signal, and the digital servo optimization device enables the error signal output by the cesium-beam tube to be maintained in a stable state by controlling the parameters, so that the output of the locked cesium atomic clock with high index is facilitated, and the service life is prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram of an embodiment of a digital servo apparatus;
FIG. 2 is an embodiment of a main control loop module error voltage;
FIG. 3 is a C field regulation loop module workflow embodiment;
FIG. 4 is a power control loop module workflow embodiment;
FIG. 5 is an embodiment of the electronic voltage doubler control loop module workflow.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The innovation points of the invention are as follows: firstly, the servo device adopts a digital circuit form, applies digital circuit components, reduces errors such as drift caused by an analog circuit, and can be digitally adjusted; secondly, the servo device can periodically and automatically adjust the signal frequency, the C field current, the microwave power and the electronic voltage doubler voltage of the cesium atomic clock, improve the long-term stability index of the cesium atomic clock and prolong the service life of the cesium atomic clock.
The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1:
fig. 1 is a diagram of an embodiment of a digital servo apparatus for improving a long-term stability index of a cesium atomic clock, and the digital servo apparatus according to the embodiment of the present invention includes: low noise amplifier 1, analog-to-digital converter 2, microcontroller 3, digital-to-analog converter 4, digital frequency synthesizer 5.
Error signal output by cesium beam tubeThe low noise amplifier and the analog-digital converter are used for transmitting the signals to the microcontroller; the microcontroller is used for outputting a regulating signal to the digital-to-analog converter: when the error signal is a master control loop error signal, the adjusting signal is a frequency adjusting signal generated according to the magnitude and direction of the error signal; when the error signal is a first C field error signal and a second C field error signal, the adjusting signal is a C field adjusting signal generated according to the comparison result of the first C field error signal and the second C field error signal, and the frequency of the first C field error signal and the frequency of the second C field error signal are input into the cesium-beam tube to be f0+△f、f0△ f, when the error signal is the first and the second power error signals, the adjusting signal is the microwave power adjusting signal generated according to the comparison result, the first and the second power error signals have power P from the input to the cesium beam tube0+△P、P0△ P, when the error signal is an electronic voltage doubler error signal, the regulating signal is an electronic voltage doubler regulating signal generated according to the comparison result of the electronic voltage doubler error signal and a threshold level, and the electronic voltage doubler error signal is input into the cesium beam tube with the frequency f0Generating a microwave signal; the digital-to-analog converter is used for receiving the adjusting signal, converting the adjusting signal into a digital signal and then sending the digital signal to a crystal oscillator and a cesium-beam tube of the cesium atomic clock; the digital frequency synthesizer is used for receiving the clock signal output by the microcontroller and outputting a reference frequency signal, and the output reference frequency signal is used for generating an excitation signal of the cesium-beam tube; wherein f is0The center frequency of the cesium atom excitation signal is △ f is a preset frequency interval, P0For optimum microwave power, △ P is the power interval.
In embodiment 1 of the present invention, the digital servo device mainly includes four independent stable regulation loops, which are respectively a main control loop module, a C field regulation loop module, a microwave power regulation loop module, and an electron multiplier regulation loop module.
Further, the microcontroller includes: a main control loop module; and the main control loop module is used for outputting the frequency adjusting signal when the error signal is the main control loop error signal, wherein the size and the sign of the frequency adjusting signal are related to the size and the sign of the error signal.
It should be noted that the function and function of the main control loop module will be discussed in detail in embodiment 3 of the present invention, and will not be described repeatedly here.
Further, the microcontroller includes: a C field regulation loop module; and the C field adjusting loop module is used for outputting the C field adjusting signal for increasing or decreasing the C field current according to the comparison result of the first and second C field error signals when the error signals are the first and second C field error signals.
It should be noted that the function and action of the C field regulation loop module will be discussed in detail in embodiment 4 of the present invention, and will not be described repeatedly here.
Further, the microcontroller includes: a power control loop module; and the power control loop module is used for outputting the microwave power adjusting signal for increasing or decreasing the microwave power according to the comparison result of the first power error signal and the second power error signal when the error signals are the first power error signal and the second power error signal.
It should be noted that the function and function of the power control loop module will be discussed in detail in embodiment 5 of the present invention, and will not be described repeatedly here.
Further, the microcontroller includes: an electronic voltage doubler control loop module; and the electronic voltage doubler control loop module is configured to, when the error signal is the electronic voltage doubler error signal, output the electronic voltage doubler adjustment signal for decreasing the electronic voltage doubler voltage if the electronic voltage doubler error signal is greater than the threshold level plus 1mV, and output the electronic voltage doubler adjustment signal for increasing the electronic voltage doubler voltage if the electronic voltage doubler error signal is less than the threshold level.
It should be noted that the function and function of the electronic voltage doubler control loop module will be discussed in detail in embodiment 5 of the present invention, and will not be described repeatedly here.
In embodiment 1 of the present invention, the low noise amplifier has the following functions that the amplified error signal output by the cesium beam tube has 2 applications: measuring Ramsey linearity, measuring noise and main loop servo control. To make the above measurements, the error signal needs to be processed differently. The Ramsey line shape is measured, and an error signal can be directly measured; measuring noise, namely performing low-pass filtering, signal low-noise amplification, signal integration and other processing on an error signal; the servo control of the main loop is to carry out low-pass filtering and signal program control amplification on the error signal. It should be noted that the main loop servo control is implemented by the main control loop module.
In embodiment 1 of the present invention, an a/D acquisition circuit, that is, the analog-to-digital converter employs a 16-bit a/D chip, the output voltage of the low noise amplifier is converted into a binary code through a/D conversion, and a microprocessor performs data processing to determine a correction voltage applied to a 10MHz crystal oscillator, a C field current, a microwave power of a DDS output signal, and an electron multiplier voltage; the D/A circuit, namely the digital-to-analog converter adopts a 20bit D/A chip, and is controlled by a microprocessor to adjust the crystal oscillator frequency, the C field current and the voltage of an electron multiplier.
In the 1 st embodiment of the invention, the microprocessor uses C8051F064 to control D/A, A/D and program controlled amplifier and servo optimization program. The servo optimization work performed in the microprocessor is the core content of the present invention. The cesium atomic clock performs servo optimization work with the period of 52.63 ms. The DDS adopts AD9852, and the central frequency of the output is 7.368230MHz as a reference frequency of a microwave phase-locked loop. This frequency is mixed multiple times with a local oscillator coherent to 100MHz, which ultimately produces an 9.19263177GHz cesium clock excitation signal. The frequency resolution of the AD9852 is 40 bits and the system clock is 40MHz, the step size of the DDS is 142nHz, theoretically the frequency resolution of the cesium clock excitation signal is 1.5E-17.
The digital servo device provided by embodiment 1 of the present invention can control a cesium atomic clock to perform Ramsey linear scanning on a cesium beam tube, adjust voltage-controlled voltage of a 10MHz crystal oscillator, and power supply parameters of the cesium beam tube, such as C field current, an electron multiplier, microwave power, etc., to realize servo optimization control of the cesium atomic clock; and provides 7.4MHz signal for microwave frequency doubling; the device is used for manufacturing the cesium atomic frequency standard, the long-term stability index of the cesium atomic clock is improved, and the service life of the cesium atomic clock is prolonged.
Example 2:
the embodiment 2 of the present invention provides a method for using a digital servo device, which uses the device described in the embodiment 1 of the present invention, and comprises the following steps:
step 101, receiving an error signal output by a cesium-beam tube, generating an adjusting signal after analog-to-digital conversion and loop adjustment, outputting after digital-to-analog conversion, and simultaneously outputting the reference frequency signal:
when the error signal is the main control loop error signal, the adjusting signal is the frequency adjusting signal; when the error signals are the first and second C field error signals, the adjustment signal is the C field adjustment signal; when the error signals are the first and second power error signals, the adjustment signal is the microwave power adjustment signal; when the error signal is a first and second electronic voltage doubler error signal, the adjustment signal is the electronic voltage doubler adjustment signal; when the error signal is an electronic voltage doubler error signal, the adjusting signal is an electronic voltage doubler adjusting signal.
Example 3:
fig. 2 illustrates an embodiment of a main control loop module error voltage, which describes a relationship between the main control loop module error voltage and a frequency adjustment, specifically:
and the main control loop module is used for outputting the frequency adjusting signal when the error signal is the main control loop error signal, wherein the size and the sign of the frequency adjusting signal are related to the size and the sign of the error signal.
In embodiment 3 of the present invention, if the input signal of the cesium-beam tube is stabilized at the center frequency of 9192631770Hz, when the microwave signals generated at the equal frequency intervals of the upper and lower center frequencies are input to the cesium-beam tube, the error signal of the main control loop is 0; otherwise, the master loop error signal is not 0. Therefore, the frequency adjusting signal can be generated through the magnitude and sign of the error signal of the main control loop, so that the input signal of the cesium-beam tube is stabilized at the central frequency.
For example, square-wave modulated microwave signals are respectively generated at positions with the central frequency of 9192631770Hz at upper and lower equal frequency intervals and fed into a cesium-beam tube, after different excitation signals enter a microwave cavity and act with cesium atoms, the direction and magnitude of the deviation between the central frequency and the transition frequency can be obtained by collecting error signals, as shown in fig. 3, signals output by the cesium-beam tube are collected at the positions with the central frequency at the upper and lower equal frequency intervals f1 and f2 to obtain error signals, the error signals can guide a servo system to rectify a 10MHz crystal oscillator, and when a locked state is reached, the error signals are 0.
The main control loop module provided by the embodiment of the invention can realize real-time adjustment of the frequency of the cesium atomic clock according to the voltage of the error signal, and realize the cesium atomic clock with high frequency stability.
Example 4:
fig. 3 is an embodiment of a work flow of the C field regulation loop module, which describes the work flow of the C field regulation loop module in detail, specifically:
when the error signal is a first C field error signal and a second C field error signal, the adjusting signal is a C field adjusting signal generated according to the comparison result of the first C field error signal and the second C field error signal, and the frequency of the first C field error signal and the frequency of the second C field error signal are input into the cesium-beam tube to be f0+△f、f0- △ f, wherein f0△ f is the central frequency of cesium atom excitation signal and is a preset frequency interval.
In the embodiment of the invention, the change of the C field strength directly affects the change of the frequency accuracy of the atomic frequency standard, and the C field current value can be determined according to the relationship between the atomic transition frequency and the magnetic field strength:
in the formula f0Is 9192631770Hz, f(0,0)Frequency of microwave excitation signal for transition of atoms, H0Is the strength of the magnetic field,the units are gauss.
Thus, after setting the center frequency, the C-field strength is determined accordingly. At mF1 or mFApplying a modulation frequency near the microwave frequency of the-1 peak detects an error signal, and the error signal reaches a minimum value when the actual magnetic field strength is consistent with a set value, so as to judge whether the C field current is the optimal C field current, thereby completing the servo optimization of the C field current.
In embodiment 4 of the present invention, the C field adjusting loop module is configured to, when the error signal is the first and second C field error signals, output the C field adjusting signal for increasing or decreasing a C field current according to a comparison result of magnitudes of the first and second C field error signals.
Specifically, the digital servo device scans a Ramsey line shape by the cesium atomic clock, determines Zeeman frequency, namely the center frequency, in the scanning process, and when the microwave frequency of an input signal of the cesium beam tube is f0+ △ f, the collection value of the analog-to-digital converter is marked as X1, and when the microwave frequency of the cesium-beam tube input signal is f0When the current is- △ f, the acquisition value of the analog-digital converter is recorded as X2. F X1>X2, increasing or decreasing the C field current; otherwise, the C field current is reduced or increased accordingly.
In the embodiment of the present invention, △ f is 200Hz, and △ f may be other values, which are not particularly limited herein.
The embodiment of the invention provides a method for automatically adjusting C field current by a C field adjusting loop module, which can reduce the influence of the C field current on the service life of a cesium atomic clock.
Example 5:
fig. 4 is an embodiment of a power control loop module workflow, which describes the workflow of the power regulation loop module in detail, specifically:
when the error signal is a first power error signal and a second power error signal, the adjusting signal is a microwave power adjusting signal generated according to the comparison result of the magnitude of the first power error signal and the second power error signal, and the input power of the first power error signal and the second power error signal to the cesium-beam tube is P0+△P、P0- △ P, wherein P0For optimum microwave power, △ P is the power interval.
And the power control loop module is used for outputting the microwave power adjusting signal for increasing or decreasing the microwave power according to the comparison result of the first power error signal and the second power error signal when the error signals are the first power error signal and the second power error signal.
In the 5 th embodiment of the present invention, a microwave tuner and a cesium beam tube microwave cavity are first prepared. Ramsey line scans at v at different microwave powersp-pI.e. the microwave power at which the peak-to-peak voltage is at a maximum, is the optimum microwave power.
In embodiment 5 of the present invention, when performing servo control on microwave power, it is necessary to keep the microwave frequency unchanged, and control the microwave to generate a square wave modulated power signal under the current power, when the central power is not the optimal power, the square wave modulated power signal is fed into the cesium beam tube to generate an error square wave signal, and when the current microwave power is higher or lower than the optimal microwave power, the error signal and the modulated signal generate a different phase, which can be used to determine the servo direction; the amplitude of the error signal will be different from the magnitude of the deviation of the optimal microwave power, and the servo of the microwave power can be realized by the two pieces of information.
Specifically, the method comprises the following steps: determination of the optimum microwave power P by scanning the microwave curve0When the microwave power of the input signal of the cesium-beam tube is P0When the cesium-beam tube is + △ P, the acquisition value of the analog-digital converter is marked as X3, and when the microwave power of the input signal of the cesium-beam tube is P0When the voltage is- △ P, the acquisition value of the analog-digital converter is recorded as X4. F X3<X4, decreasing or increasing the microwave power; otherwise, the microwave power is increased or decreased accordingly.
In the embodiment of the present invention, the △ P is 1dBmW, and it should be noted that the △ P may also be other values, which are not particularly limited herein.
According to the embodiment of the invention, the cesium atoms can feel stable microwave power through servo control of the microwave power, and the long-term frequency stability of the cesium atomic clock can be improved.
Example 6:
fig. 5 is an embodiment of a work flow of the electronic voltage doubler control loop module, which describes the work flow of the electronic voltage doubler control loop module in detail, specifically:
when the error signal is an electronic voltage doubler error signal, the adjusting signal is an electronic voltage doubler adjusting signal generated according to the comparison result of the electronic voltage doubler error signal and the threshold level, and the electronic voltage doubler error signal is input into the cesium beam tube at the frequency f0Is generated.
The amplification amount of the electron multiplier is reduced along with the increase of the working time, when the amplification amount of the electron multiplier reaches a certain threshold, the cesium atomic clock can stably work, and the cesium atomic clock cannot normally work when the amplification amount of the electron multiplier is smaller than the threshold.
In the servo control of the amplification amount of the electron multiplier, it is necessary to detect the magnitude of the error signal when the microwave frequency is the center frequency of the cesium beam tube, determine the servo direction from the increase and decrease of the error signal, and adjust the voltage of the electron multiplier.
And the electronic voltage doubler control loop module is configured to, when the error signal is the electronic voltage doubler error signal, output the electronic voltage doubler adjustment signal for decreasing the electronic voltage doubler voltage if the electronic voltage doubler error signal is greater than the threshold level plus 1mV, and output the electronic voltage doubler adjustment signal for increasing the electronic voltage doubler voltage if the electronic voltage doubler error signal is less than the threshold level.
For example, when the frequency of the input signal of the cesium-beam tube is f0When the voltage is higher than the threshold level +1mV, the voltage of the electronic voltage multiplier is reduced; if the recorded value is less than the threshold level, the voltage of the electronic voltage multiplier is reduced.
According to the embodiment of the invention, the electronic voltage doubler does not stop working due to long-time use of the cesium atomic clock through servo control of the electronic voltage doubler, and the long-term frequency stability of the cesium atomic clock can be improved.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. A digital servo device for a cesium atomic clock is characterized in that,
the error signal output by the cesium-beam tube is transmitted to the microcontroller through a low-noise amplifier and an analog-digital converter;
the microcontroller is used for outputting a regulating signal to the digital-to-analog converter:
when the error signal is a master control loop error signal, the adjusting signal is a frequency adjusting signal generated according to the magnitude and direction of the error signal;
when the error signal is a first C field error signal and a second C field error signal, the adjusting signal is a C field adjusting signal generated according to the comparison result of the first C field error signal and the second C field error signal, and the frequency of the first C field error signal and the frequency of the second C field error signal are input into the cesium-beam tube to be f0+△f、f0- △ f;
when the error signal is a first power error signal and a second power error signal, the adjusting signal is a microwave power adjusting signal generated according to the comparison result of the two, and the first power and the second power are mistakenly generatedThe input power of the difference signal to the cesium-beam tube is P0+△P、P0- △ P;
when the error signal is an electronic voltage doubler error signal, the adjusting signal is an electronic voltage doubler adjusting signal generated according to the comparison result of the electronic voltage doubler error signal and the threshold level, and the electronic voltage doubler error signal is input into the cesium beam tube at the frequency f0Generating a microwave signal;
the digital-to-analog converter is used for receiving the adjusting signal, converting the adjusting signal into a digital signal and then sending the digital signal to a crystal oscillator and a cesium-beam tube of the cesium atomic clock;
the digital frequency synthesizer is used for receiving the clock signal output by the microcontroller and outputting a reference frequency signal, and the output reference frequency signal is used for generating an excitation signal of the cesium-beam tube;
wherein f is0The center frequency of the cesium atom excitation signal is △ f is a preset frequency interval, P0For optimum microwave power, △ P is the power interval.
2. The digital servo apparatus of claim 1 wherein the microcontroller comprises: a main control loop module;
and the main control loop module is used for outputting the frequency adjusting signal when the error signal is the main control loop error signal, wherein the size and the sign of the frequency adjusting signal are related to the size and the sign of the error signal.
3. The digital servo apparatus of claim 1 wherein the microcontroller comprises: a C field regulation loop module;
and the C field adjusting loop module is used for outputting the C field adjusting signal for increasing or decreasing the C field current according to the comparison result of the first and second C field error signals when the error signals are the first and second C field error signals.
4. The digital servo apparatus of claim 1 wherein the microcontroller comprises: a power control loop module;
and the power control loop module is used for outputting the microwave power adjusting signal for increasing or decreasing the microwave power according to the comparison result of the first power error signal and the second power error signal when the error signals are the first power error signal and the second power error signal.
5. The digital servo apparatus of claim 1 wherein the microcontroller comprises: an electronic voltage doubler control loop module;
and the electronic voltage doubler control loop module is configured to, when the error signal is the electronic voltage doubler error signal, output the electronic voltage doubler adjustment signal for decreasing the electronic voltage doubler voltage if the electronic voltage doubler error signal is greater than the threshold level plus 1mV, and output the electronic voltage doubler adjustment signal for increasing the electronic voltage doubler voltage if the electronic voltage doubler error signal is less than the threshold level.
6. The digital servo device of claim 1 wherein the microcontroller is C8051F 064.
7. The digital servo apparatus of claim 1 wherein the analog-to-digital converter employs a 16-bit a/D chip and the digital-to-analog converter employs a 20-bit D/a chip.
8. The digital servo apparatus of claim 1 wherein the digital frequency synthesizer is AD9852 and the center frequency of the reference frequency signal is 7.368230 MHz.
9. A method for using a digital servo device, using the device of any one of claims 1-8, comprising the steps of:
receiving an error signal output by a cesium-beam tube, generating an adjusting signal after analog-to-digital conversion and loop adjustment, outputting after digital-to-analog conversion, and simultaneously outputting a reference frequency signal:
when the error signal is the main control loop error signal, the adjusting signal is the frequency adjusting signal;
when the error signals are the first and second C field error signals, the adjustment signal is the C field adjustment signal;
when the error signals are the first and second power error signals, the adjustment signal is the microwave power adjustment signal;
when the error signal is a first and second electronic voltage doubler error signal, the adjustment signal is the electronic voltage doubler adjustment signal;
when the error signal is an electronic voltage doubler error signal, the adjusting signal is an electronic voltage doubler adjusting signal.
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| CN201911216194.8A CN110989325B (en) | 2019-12-02 | 2019-12-02 | Digital servo device and using method |
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