CN116599526B - High-precision frequency output control device and clock source - Google Patents
- ️Fri Sep 22 2023
CN116599526B - High-precision frequency output control device and clock source - Google Patents
High-precision frequency output control device and clock source Download PDFInfo
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- CN116599526B CN116599526B CN202310870329.2A CN202310870329A CN116599526B CN 116599526 B CN116599526 B CN 116599526B CN 202310870329 A CN202310870329 A CN 202310870329A CN 116599526 B CN116599526 B CN 116599526B Authority
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a high-precision frequency output control device and a clock source, and relates to the technical field of clock sources. According to the invention, two-stage frequency regulation of rubidium clock output is realized, and frequency accuracy is improved, so that high-precision frequency output of the rubidium clock is realized, the application range of the rubidium clock is widened, and preferably, when the frequency control precision of the DDS module is higher than that of the rubidium clock by a plurality of orders, the accuracy of a frequency signal output to frequency utilization equipment is improved by a plurality of orders.
Description
Technical Field
The invention belongs to the technical field of clock sources, in particular to the technical field of rubidium atomic clocks, and particularly relates to a high-precision frequency output control device and a clock source.
Background
The clock source is used as frequency reference signal (frequency standard) output equipment, is an important component of a frequency system for satellite navigation, measurement, time frequency and the like, and the accuracy and stability of the output frequency are relevant to the performance quality of the system.
Among them, rubidium clocks (rubidium atomic clocks) in clock sources have the advantages of small volume, small mass, short preheating time, low price and the like and are widely adopted, but have the defects of relatively poor frequency accuracy, relatively large frequency drift and the like, so the rubidium clocks are often used as a secondary clock source of a frequency using system. The frequency reference signal output by the rubidium clock can overcome the frequency drift of the frequency reference signal by the rapid taming or the external second synchronization through the GPS system, and most of frequency synchronization control modes adopted in the frequency correction process of the traditional rubidium clock are as follows: the output frequency of the rubidium seed is synchronized to the reference clock by adjusting the frequency control word of the rubidium seed. This control scheme allows the accuracy of the 10MHz frequency reference signal output by the rubidium clock to depend entirely on its own frequency control accuracy. The control precision of the rubidium clock frequency which is relatively high in the industry is 6.8E-13 magnitude, and the index can meet the accuracy requirement of most frequency-using systems on frequency reference signals. However, with the advent of various emerging frequency systems in the fields of communications, aerospace, measurement, etc., higher demands are being made on the frequency accuracy and stability of rubidium clock output, for example, on the accuracy of clock synchronization in the femtosecond scale. Therefore, for rubidium clock, those skilled in the art are continually seeking new frequency synchronization control methods to improve the frequency accuracy and stability of rubidium clock output.
In view of the foregoing, an improved synchronous control method for rubidium clock frequency is needed.
Disclosure of Invention
In view of this, the present invention provides a high-precision frequency output control device and clock source to solve the technical problem that the frequency accuracy of the output of the rubidium clock is completely dependent on the frequency control precision thereof by the existing synchronous control method of the frequency of the rubidium clock, so that the accuracy of the output frequency of the rubidium clock cannot be further improved.
The aim of the invention is realized by the following technical scheme:
first aspect
The first aspect of the invention provides a high-precision frequency output control device, which comprises a DDS module, a feedback module, an MCU module and a phase detection module;
the feedback module is used for feeding back an initial frequency signal sent by the DDS module to external frequency equipment to the phase discrimination module, and the initial frequency signal is accessed to the DDS module after being generated by an external rubidium clock;
the phase discrimination module is used for measuring a first phase difference between the standard frequency signal and the initial frequency signal after receiving the standard frequency signal from an external frequency reference source and transmitting the first phase difference to the MCU module;
the MCU module is used for generating a first frequency difference based on a fuzzy PID algorithm of the MCU module and the first phase difference, calculating a first frequency control word and a second frequency control word according to a frequency control precision value of the rubidium clock and a frequency control precision value of the DDS module, and then sending the first frequency control word to the rubidium clock so that the rubidium clock performs frequency compensation according to the first frequency control word, and sending an initial frequency signal after frequency compensation to the DDS module;
the MCU module is also used for sending the second frequency control word to the DDS module;
the DDS module is used for taking the initial frequency signal after frequency compensation as a reference clock, carrying out frequency compensation on the reference clock according to a second frequency control word, and obtaining a first target frequency signal after frequency compensation, wherein the first target frequency signal is used for being sent to frequency using equipment;
the frequency control precision value of the rubidium clock is larger than that of the DDS module, and the frequency compensation value jointly completed by the rubidium clock and the DDS module is equal to the first frequency difference or the absolute value of the difference value between the rubidium clock and the first frequency difference is smaller than that of the DDS module.
Further, the calculating of the frequency control precision value of the rubidium clock and the frequency control precision value of the DDS module is used for obtaining a first frequency control word and a second frequency control word, and the specific process is as follows:
dividing the first frequency difference by the frequency control precision value of the rubidium clock, and rounding the divided data to obtain a first frequency control word;
and dividing the first frequency difference and the first frequency compensation value by the frequency control precision value of the DDS module, and rounding the divided data to obtain a second frequency control word, wherein the first frequency compensation value is the product of the frequency control precision value of the rubidium clock and the first frequency control word.
Further, when the phase discrimination module does not receive the standard frequency signal input of the frequency reference source, the MCU module generates a first monitoring signal and sends the first monitoring signal to external interaction equipment so that the interaction equipment generates a first trigger signal according to the first monitoring signal;
after receiving the first trigger signal, the MCU module generates a second frequency difference based on the self-preset rubidium clock frequency drift rate, calculates a third frequency control word and a fourth frequency control word according to the frequency control precision value of the rubidium clock and the frequency control precision value of the DDS module, and then sends the third frequency control word to the rubidium clock so that the rubidium clock performs frequency compensation according to the third frequency control word, a first frequency signal is obtained after the frequency compensation, and the first frequency signal is sent to the DDS module;
the MCU module is also used for sending a fourth frequency control word to the DDS module;
the DDS module is used for taking the first frequency signal as a reference clock, carrying out frequency compensation on the reference clock according to a fourth frequency control word, and obtaining a second target frequency signal after the frequency compensation, wherein the second target frequency signal is used for being sent to frequency-using equipment;
the frequency compensation value jointly completed by the current rubidium clock and the DDS module is equal to the second frequency difference or the absolute value of the difference value between the current rubidium clock and the second frequency difference is smaller than the frequency control precision value of the DDS module.
Further, the feedback module is a power divider, a combining end of the power divider is connected with the DDS module, a first branching end of the power divider is used for being connected with external frequency-using equipment, and a second branching end of the power divider is connected with the phase discrimination module.
Further, the phase detection module is a frequency phase detector.
Based on the proposal of the high-precision frequency output control device, when the frequency synchronization control is carried out on the rubidium clock, the frequency synchronization control mode adopted by the device is a two-stage frequency adjustment mode, the first-stage frequency adjustment is rubidium clock frequency compensation based on a first frequency control word, the second-stage frequency adjustment is DDS frequency compensation based on a second frequency control word, and because the frequency control precision of the rubidium clock is lower than that of a DDS module, the first-stage frequency adjustment is called a coarse adjustment stage, and the second-stage frequency adjustment is called a fine adjustment stage.
Meanwhile, with the aid of the high-precision frequency output control device adopting the two-stage frequency adjustment mode, after the upper-stage frequency reference source completes frequency synchronization of the rubidium clock, the rubidium clock enters a time keeping stage, the situation that the standard frequency signal of the upper-stage frequency reference source is lost can occur in the time keeping stage, when the high-precision frequency output control device loses the standard frequency signal input of the upper-stage frequency reference source, frequency drift caused by daily aging or temperature change of rubidium seeds can finally cause frequency offset of the target frequency signal, and therefore in order to enable the target frequency signal output to frequency utilization equipment to still maintain high frequency accuracy, frequency compensation needs to be conducted on the first target frequency signal in the time keeping stage. The MCU module is additionally provided with an interaction function with external interaction equipment and a monitoring and triggering function for whether a standard frequency signal is accessed or not, so that the MCU module can compensate a second frequency difference according to the frequency drift rate of the rubidium clock, and the second frequency difference compensation mode also adopts the two-stage frequency adjustment mode.
The first aspect of the invention has the following beneficial effects:
(1) By combining the arrangement of the DDS module, the MCU module, the feedback module and the phase discrimination module, two-stage frequency regulation of rubidium clock output is realized, and the accuracy of a frequency reference signal output to frequency-using equipment is improved, so that high-precision frequency output of the rubidium clock is realized, the application range of the rubidium clock is widened, and for example, a frequency-using system requiring femto-second clock synchronization precision is provided; preferably, when the frequency control precision of the DDS module is higher than the frequency control precision of the rubidium clock by a plurality of orders, the accuracy of the frequency signal output to the frequency using equipment is improved by a plurality of orders;
(2) The rubidium clock obtains a good time keeping index through the frequency drift compensation of the stage of rubidium Zhong Shoushi;
(3) Compared with the frequency control precision of the rubidium clock or the frequency control precision of the DDS module, the two-stage frequency adjustment mode has a wider adjustable frequency range, so that the high-precision frequency output control device is more flexible in frequency adjustment of the frequency synchronization stage and the time keeping stage of the rubidium clock, and the adjustable frequency range of the rubidium clock and/or the adjustable frequency range of the DDS module can be fully utilized.
Second aspect
A second aspect of the present invention proposes a high precision clock source comprising a rubidium clock and a high precision frequency output control device according to the first aspect of the present invention, said rubidium clock being connected to said device, said device being further adapted to be connected to an external frequency reference source and an external frequency consuming device, respectively.
The second aspect of the present invention brings about the same advantageous effects as the first aspect and is not described in detail herein. Meanwhile, the clock source realized by the second aspect of the invention fully combines the advantages of low cost and the like of the rubidium clock, and has higher frequency accuracy in both the frequency synchronization stage and the time keeping stage.
Drawings
FIG. 1 is a block diagram showing a high-precision frequency output control apparatus according to an embodiment;
fig. 2 is a block diagram of a high precision clock source implemented in accordance with the second embodiment.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
The following embodiments 1 and 2 should be referred to together.
Example 1
The embodiment provides a high-precision frequency output control device, which is used for correcting an output frequency standard of a rubidium clock and then transmitting the corrected frequency standard to frequency using equipment.
Specifically, the high-precision frequency output control device comprises a DDS module, a feedback module, an MCU module and a phase detection module. The DDS module is used for being connected with an external rubidium clock and external frequency equipment respectively, the DDS module is also connected with the feedback module and the MCU module respectively, the MCU module is connected with the phase discrimination module, the MCU module is also used for being connected with the external rubidium clock, the phase discrimination module is connected with the feedback module, the phase discrimination module is also used for being connected with an external frequency reference source, and the external frequency reference source is used for generating a standard frequency signal.
The feedback module is used for feeding back an initial frequency signal sent by the DDS module to the external frequency equipment to the phase discrimination module, and the initial frequency signal is generated through an external rubidium clock and then is connected to the DDS module and used as a reference signal of the DDS module.
The phase discrimination module is used for measuring a first phase difference between the standard frequency signal and the initial frequency signal after receiving the standard frequency signal from an external frequency reference source and transmitting the first phase difference to the MCU module.
The MCU module is used for generating a first frequency difference based on a fuzzy PID algorithm preset by the MCU module and a first phase difference, obtaining a first frequency control word and a second frequency control word through frequency control precision numerical value of the rubidium clock and frequency control precision numerical value calculation of the DDS module, and then sending the first frequency control word to the rubidium clock so that the rubidium clock performs frequency compensation according to the first frequency control word, and sending an initial frequency signal after frequency compensation to the DDS module, and the MCU module is also used for sending the second frequency control word to the DDS module.
The DDS module is used for taking the initial frequency signal after frequency compensation as a reference clock, carrying out frequency compensation on the reference clock according to a second frequency control word, and obtaining a first target frequency signal after frequency compensation, wherein the first target frequency signal is used for being sent to frequency using equipment. The frequency control precision value of the rubidium clock is larger than that of the DDS module, and the frequency compensation value jointly completed by the rubidium clock and the DDS module is equal to the first frequency difference or the absolute value of the difference value between the rubidium clock and the first frequency difference is smaller than that of the DDS module.
In some embodiments, the feedback module is a power divider, preferably a one-to-two power divider, and the combining end of the power divider is connected to the DDS module, and is connected to the initial frequency signal or the first target frequency signal obtained after frequency compensation. The first shunt end of the power divider is used for being connected with external frequency-using equipment, and the initial frequency signal or the first target frequency signal obtained after frequency compensation is used as a frequency standard signal to be output. As can be seen, the frequency output control device implemented in this embodiment has a short correction process for the output frequency of the rubidium clock, so that the frequency device discards the initial frequency signal received initially, starts the first target frequency signal obtained after stable frequency compensation after a preset time, and uses the first target frequency signal as the frequency standard in its own device. The second shunt end of the power divider is connected with the phase discrimination module and is used for feeding back an initial frequency signal or a first target frequency signal obtained after frequency compensation to the phase discrimination module. The phase detection module is preferably a frequency phase detector. The external frequency reference source may be a GPS receiving system or other primary frequency reference source. When the MCU module generates the first frequency difference according to the first phase difference, the filtering algorithm and the fuzzy PID algorithm are both algorithm processes in the common embodiment based on a preset filtering algorithm and the like, and the embodiment does not describe the content of the part. The DDS module is preferably a commercially available DDS chip.
As an improvement of the above embodiment, the first frequency control word and the second frequency control word are obtained by calculating the frequency control precision value of the rubidium clock and the frequency control precision value of the DDS module, which specifically includes the following steps:
A01. dividing the first frequency difference by the frequency control precision value of the rubidium clock, and rounding the divided data to obtain a first frequency control word;
A02. and dividing the first frequency difference and the first frequency compensation value by the frequency control precision value of the DDS module, and rounding the divided data to obtain a second frequency control word, wherein the first frequency compensation value is the product of the frequency control precision value of the rubidium clock and the first frequency control word.
Based on the improvement, the following description will be given by taking the first frequency difference between the initial frequency signal and the standard frequency signal as 4.3E-12 as an example to describe the frequency synchronous control process of the frequency output control device on the output of the rubidium clock, wherein the frequency control precision value of the selected rubidium clock is 6.8E-13, one frequency control word of the rubidium clock represents the frequency adjustment size of 6.8E-13, the frequency control precision value of the DDS module is 1.7E-16, and one frequency control word of the DDS module represents the frequency adjustment size of 1.7E-16.
The frequency output control device controls the frequency synchronization of rubidium clock output, and the method concretely comprises the following steps:
s100, coarse adjustment: calculating 4.3E-12/6.8E-13 approximately equal to 6.3, and rounding 6.3 to obtain 6, so that the first frequency control word is 6, the frequency compensation value of the rubidium clock (first frequency compensation value) =6×6.8E-13=4.08E-12, and the frequency difference of the rest 2.2E-13 is subjected to frequency compensation by the DDS module;
s200, fine adjustment: calculating 2.2E-13/1.7E-16 approximately equal to 1307.1, rounding 1307.1 to obtain 1307, so that the second frequency control word is 1307, and performing frequency compensation by the DDS module according to the second frequency control word.
After the coarse adjustment stage and the fine adjustment stage, the frequency compensation value jointly completed by the rubidium clock and the DDS module is close to the first frequency difference to the greatest extent, so that the frequency accuracy of the first target frequency signal finally output to the external frequency equipment is superior to that of the standard frequency signal by 2E-16 orders of magnitude, and the frequency accuracy of the first target frequency signal is improved by 3 orders of magnitude compared with that of the traditional frequency synchronous control mode of the rubidium clock. If the frequency control precision of the selected DDS module is higher, the frequency accuracy of the first target frequency signal compared with the standard frequency signal is further improved.
In some special cases, the frequency output control device may lose the standard frequency signal input by the upper level frequency reference source, for example, the GPS receiving system fails in timing from the satellite or the atomic clock serving as the upper level frequency reference source fails in a special environment.
Therefore, as another improvement of the above embodiment, when the phase detection module does not receive the standard frequency signal input of the frequency reference source, the phase detection module does not have the first phase difference output, so that the MCU module generates the first monitoring signal and sends the first monitoring signal to the external interaction device, so that the interaction device generates the first trigger signal according to the first monitoring signal;
after receiving the first trigger signal, the MCU module generates a second frequency difference based on the self-preset rubidium clock frequency drift rate, calculates a third frequency control word and a fourth frequency control word according to the frequency control precision value of the rubidium clock and the frequency control precision value of the DDS module, and then sends the third frequency control word to the rubidium clock so that the rubidium clock performs frequency compensation according to the third frequency control word, a first frequency signal is obtained after the frequency compensation, the first frequency signal is sent to the DDS module, and the MCU module is further used for sending the fourth frequency control word to the DDS module;
the DDS module is used for taking the first frequency signal as a reference clock, carrying out frequency compensation on the reference clock according to a fourth frequency control word, and obtaining a second target frequency signal after the frequency compensation, wherein the second target frequency signal is used for being sent to frequency-using equipment; the frequency compensation value jointly completed by the current rubidium clock and the DDS module is equal to the second frequency difference or the absolute value of the difference value between the current rubidium clock and the second frequency difference is smaller than the frequency control precision value of the DDS module.
In some embodiments, because the frequency drift rate of the rubidium clock caused by the aging drift and the temperature aging drift is determined based on the intrinsic parameters of the rubidium clock, the frequency drift rate can also be obtained after analyzing and optimizing the intrinsic parameters of the rubidium clock according to the empirical knowledge, and the determination process of the frequency drift rate is the process in the common embodiment, which is not improved in this part. The process principle of calculating the third frequency control word and the fourth frequency control word by the MCU module through the frequency control precision value of the rubidium clock and the frequency control precision value of the DDS module is identical to the steps A01 and A02.
Based on the improvement, the compensation process of the output frequency of the rubidium Zhong Shoushi stage by the frequency control device is described by taking the frequency drift value at the current moment as 2E-13, namely the second frequency difference as 2E-13, wherein the frequency control precision value of the selected rubidium clock is 6.8E-13, one frequency control word of the rubidium clock represents the frequency adjustment size as 6.8E-13, the frequency control precision value of the DDS module is 1.7E-16, and one frequency control word of the DDS module represents the frequency adjustment size as 1.7E-16.
The compensation process of the frequency control device to the output frequency of the rubidium Zhong Shoushi stage specifically comprises the following steps:
SS1. Because 2E-13 is smaller than the frequency control precision value of the rubidium clock, the current frequency drift cannot be regulated through the rubidium clock, so that the third frequency control word takes the value 0, 1176 is obtained by rounding 1176.4 by calculating 2E-13/1.7E-16 approximately equal to 1176.4, the fourth frequency control word is 1176, and the DDS module compensates the second frequency difference according to the fourth frequency control word.
Example two
The embodiment provides a high-precision clock source based on the implementation of the first embodiment, and the high-precision clock source comprises a high-precision frequency output control device and a rubidium clock, wherein the rubidium clock is connected with the high-precision frequency output control device, and the high-precision frequency output control device is further used for being respectively connected with an external frequency reference source and frequency using equipment.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (6)
1. The high-precision frequency output control device is characterized by comprising a DDS module, a feedback module, an MCU module and a phase discrimination module;
the feedback module is used for feeding back an initial frequency signal sent by the DDS module to external frequency equipment to the phase discrimination module, and the initial frequency signal is accessed to the DDS module after being generated by an external rubidium clock;
the phase discrimination module is used for measuring a first phase difference between the standard frequency signal and the initial frequency signal after receiving the standard frequency signal from an external frequency reference source and transmitting the first phase difference to the MCU module;
the MCU module is used for generating a first frequency difference based on a fuzzy PID algorithm of the MCU module and the first phase difference, calculating a first frequency control word and a second frequency control word according to a frequency control precision value of the rubidium clock and a frequency control precision value of the DDS module, and then sending the first frequency control word to the rubidium clock so that the rubidium clock performs frequency compensation according to the first frequency control word, and sending an initial frequency signal after frequency compensation to the DDS module;
the MCU module is also used for sending the second frequency control word to the DDS module;
the DDS module is used for taking the initial frequency signal after frequency compensation as a reference clock, carrying out frequency compensation on the reference clock according to a second frequency control word, and obtaining a first target frequency signal after frequency compensation, wherein the first target frequency signal is used for being sent to frequency using equipment;
the frequency control precision value of the rubidium clock is larger than that of the DDS module, and the frequency compensation value jointly completed by the rubidium clock and the DDS module is equal to the first frequency difference or the absolute value of the difference value between the rubidium clock and the first frequency difference is smaller than that of the DDS module.
2. The high-precision frequency output control device according to claim 1, wherein the first frequency control word and the second frequency control word are obtained by calculating the frequency control precision value of the rubidium clock and the frequency control precision value of the DDS module, and the specific process is as follows:
dividing the first frequency difference by the frequency control precision value of the rubidium clock, and rounding the divided data to obtain a first frequency control word;
and dividing the first frequency difference and the first frequency compensation value by the frequency control precision value of the DDS module, and rounding the divided data to obtain a second frequency control word, wherein the first frequency compensation value is the product of the frequency control precision value of the rubidium clock and the first frequency control word.
3. A high-precision frequency output control device as defined in claim 1, wherein,
when the phase discrimination module does not receive the standard frequency signal input of the frequency reference source, the MCU module generates a first monitoring signal and sends the first monitoring signal to external interaction equipment so that the interaction equipment can generate a first trigger signal according to the first monitoring signal;
after receiving the first trigger signal, the MCU module generates a second frequency difference based on the self-preset rubidium clock frequency drift rate, calculates a third frequency control word and a fourth frequency control word according to the frequency control precision value of the rubidium clock and the frequency control precision value of the DDS module, and then sends the third frequency control word to the rubidium clock so that the rubidium clock performs frequency compensation according to the third frequency control word, a first frequency signal is obtained after the frequency compensation, and the first frequency signal is sent to the DDS module;
the MCU module is also used for sending a fourth frequency control word to the DDS module;
the DDS module is used for taking the first frequency signal as a reference clock, carrying out frequency compensation on the reference clock according to a fourth frequency control word, and obtaining a second target frequency signal after the frequency compensation, wherein the second target frequency signal is used for being sent to frequency-using equipment;
the frequency compensation value jointly completed by the current rubidium clock and the DDS module is equal to the second frequency difference or the absolute value of the difference value between the current rubidium clock and the second frequency difference is smaller than the frequency control precision value of the DDS module.
4. The high-precision frequency output control device according to claim 1, wherein the feedback module is a power divider, a combining end of the power divider is connected with the DDS module, a first branching end of the power divider is used for being connected with external frequency-using equipment, and a second branching end of the power divider is connected with the phase discrimination module.
5. The high precision frequency output control device of claim 1, wherein the phase detection module is a frequency phase detector.
6. A high precision clock source comprising a rubidium clock and a high precision frequency output control apparatus according to any one of claims 1-5, said rubidium clock being connected to said apparatus, said apparatus further being adapted to be connected to an external frequency reference source and an external frequency consuming device, respectively.
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