CN105743498A - Time reference system and apparatus, and method and device for time reference - Google Patents
Time reference system and apparatus, and method and device for time reference Download PDFInfo
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- CN105743498A CN105743498A CN201610068450.3A CN201610068450A CN105743498A CN 105743498 A CN105743498 A CN 105743498A CN 201610068450 A CN201610068450 A CN 201610068450A CN 105743498 A CN105743498 A CN 105743498A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000013078 crystal Substances 0.000 claims abstract description 137
- 238000007493 shaping process Methods 0.000 claims abstract description 12
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 239000010453 quartz Substances 0.000 claims description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 40
- 230000008859 change Effects 0.000 claims description 18
- 230000010355 oscillation Effects 0.000 claims description 16
- 230000009466 transformation Effects 0.000 claims description 14
- 238000009529 body temperature measurement Methods 0.000 claims description 10
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 230000026676 system process Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 abstract 1
- 238000013461 design Methods 0.000 description 9
- 230000005283 ground state Effects 0.000 description 6
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- 230000035800 maturation Effects 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
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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
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
- H03L1/022—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature
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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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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Oscillators With Electromechanical Resonators (AREA)
- Electric Clocks (AREA)
Abstract
The invention discloses a time reference system, a time reference apparatus, and a method and a device for time reference. The time reference system comprises a crystal oscillator; a signal processor which comprises a frequency-selecting amplifier connected with the crystal oscillator, a signal shaping circuit connected with the frequency-selecting amplifier, and an isolation amplifier connected with the signal shaping circuit; a quantum system and a frequency divider; a GPS receiver used for receiving a frequency signal from a GPS antenna and acquiring a second frequency signal; a phase discriminator connected with the GPS receiver and the frequency divider respectively; a loop filter connected with the phase discriminator and the crystal oscillator respectively; a temperature compensator distributed at the peripheral part of the crystal oscillator; and a microcontroller connected with the quantum system, the crystal oscillator and the temperature compensator respectively. According to the system, the nonlinear frequency drift of the crystal oscillator can be compensated. The advantages of simple structure and wide adaptability are provided.
Description
Technical field
The invention belongs to atomic frequency standard technical field, particularly to the system of a kind of time reference, equipment, for the method for time reference and device.
Background technology
VCXO is the core component of atomic clock, in traditional frequency marking crystal oscillation body design link, the square crystal oscillator of existing maturation on the market is generally adopted to be used as frequency source, and this link is frequently not and is designed by the personnel of whole frequency marking circuitry link, but select agitator ripe on the market according to certain index, performance requirement.
nullBut，Entering today that indexing is harsh，Owing to atomic clock complete machine structure layout there occurs change，No matter it is that small form factor requirements disposes the parts that number is many on narrow plate space of planes，Or indexing requires each design parameter of VCXO is made further improvements，All necessarily that the design of each link is fully aware of，VCXO also must adopt autonomy-oriented to design，Practical layout considers possibly oneself design voltage-controlled mode and starting of oscillation design，Especially the INSULATION DESIGN of crystal oscillator，Because it is sizable that the output of crystal oscillator frequency is affected by the change of temperature，Particularly when each system electrification，Owing to system is likely to be at cold conditions or hot，For oscillating loop，Owing to residing temperature is all inconsistent each time，The rate-adaptive pacemaker being likely to result in reality is different，For Passive rubidium frequency standard，Owing to circuitry design (includes frequency multiplication number of times、Synthesizer rate-adaptive pacemaker etc.) it is strictly according to calculated in theory，The change on a large scale of VCXO output frequency，Most likely result in servo link cannot be locked in atomic ground state 0-0 jump frequency by crystal oscillator output frequency.
Summary of the invention
The present invention provide the system of a kind of time reference, equipment, for the method for time reference and device, solve or part solve above-mentioned technical problem of the prior art.
The invention provides the system of a kind of time reference, including: crystal oscillator, it is used for producing oscillator signal；Signal processor, described signal processor includes: frequency-selective amplifier, and the input of described frequency-selective amplifier is connected with described crystal oscillator, receives described oscillator signal and frequency-selecting is amplified；Signal transformation circuit, described signal transformation circuit is connected with the outfan of described frequency-selective amplifier, so that the described oscillator signal after frequency-selecting is amplified is carried out signal shaping, obtains first frequency signal；Isolated amplifier, the input of described isolated amplifier is connected with described signal transformation circuit, described first frequency signal is at least delivered to following receptor: quantized system, frequency divider；GPS, for receiving the frequency signal from gps antenna, obtains second frequency signal；Phase discriminator, is connected with described GPS and described frequency divider respectively, receives and compares the phase contrast between described first frequency signal and described second frequency signal, to produce GPS deviation correcting signal；Loop filter, is connected with described phase discriminator and described crystal oscillator respectively, the frequency of described crystal oscillator is carried out Primary regulation according to described GPS deviation correcting signal；Temperature compensator, described temperature compensator is distributed in the peripheral position of described crystal oscillator, and the operating ambient temperature change detecting described crystal oscillator produces bridge-type pressure difference signal；Microcontroller, described microcontroller is connected with described quantized system, described crystal oscillator and described temperature compensator respectively, according to the quantum deviation correcting signal received the frequency of described crystal oscillator carried out Secondary Control, and according to the bridge-type pressure difference signal received, the frequency of described crystal oscillator is carried out three times and regulate.
The invention provides the equipment of a kind of time reference, including: GPS, for receiving the frequency signal from gps antenna, obtain second frequency signal；Phase discriminator, is connected with GPS and frequency divider respectively, receives and compares the phase contrast between the first frequency signal produced by crystal oscillator and described second frequency signal, to produce GPS deviation correcting signal；Loop filter, is connected with described phase discriminator and described crystal oscillator respectively, the frequency of described crystal oscillator is carried out Primary regulation according to described GPS deviation correcting signal；Temperature compensator, described temperature compensator is distributed in the peripheral position of described crystal oscillator, and the operating ambient temperature according to described crystal oscillator changes generation bridge-type pressure difference signal；Microcontroller, described microcontroller is connected with quantized system, described crystal oscillator and described temperature compensator respectively, according to the quantum deviation correcting signal received the frequency of described crystal oscillator carried out Secondary Control, and bridge-type pressure difference signal according to described reception the frequency of described crystal oscillator carried out three times regulate.
Optional: described GPS at least includes the Jupiter12 series TU35-D410-021GPS module of NAVMAN company.
Optional: described phase discriminator is the current mode phase discriminator selecting PHILIPS Co.'s model to be 74HCT9046AIC.
Optionally, described crystal oscillator includes: starting of oscillation subcircuit, is connected with described temperature compensator；Critesistor, is connected with described starting of oscillation subcircuit；Varactor group, is connected with described starting of oscillation subcircuit；Wherein, changed by the capacitance of the change in resistance of described critesistor and described varactor group, to offset or to cut down the temperature drift of frequency of oscillation.
Optionally, described varactor group includes: the first varactor；Second varactor；3rd varactor；Wherein, described first varactor, described second varactor, the 3rd varactor are connected with described starting of oscillation subcircuit respectively, and received from non-linear frequency drift to quartz crystal unit of the GPS deviation correcting signal of phase discriminator by described first varactor, received from non-linear frequency drift to quartz crystal unit of the bridge-type pressure difference signal of described temperature compensator by described second varactor, described 3rd varactor receive the non-linear frequency drift to quartz crystal unit of the quantum deviation correcting signal from quantized system.
Optionally, described temperature compensator includes: bridge temperature measurement circuit；First voltage follower, is connected with described bridge temperature measurement circuit；Second voltage follower, is connected with described bridge temperature measurement circuit；Difference amplifier, is connected with described first voltage follower, the second voltage follower respectively；Gain linearity regulates circuit, is connected with described difference amplifier and described microcontroller respectively；Wherein, regulate circuit by gain linearity and obtain temperature-compensated voltage, and transmit to after described microcontroller, by described second varactor according to the described temperature-compensated voltage non-linear frequency drift to quartz crystal unit.
The invention provides a kind of method for time reference, described method includes: produce oscillator signal；To obtaining first frequency signal after described oscillator signal frequency-selecting amplification and signal shaping；By the second frequency signal from gps antenna, carry out phase demodulation with described first frequency signal, it is thus achieved that GPS deviation correcting signal；The frequency of described oscillator signal is adjusted, so that the drift of the non-linear frequency of quartz crystal unit is carried out single compensation according to described GPS deviation correcting signal；Detection, for producing the operating ambient temperature parameter of the signal source of described oscillator signal, obtains bridge-type pressure difference signal according to described operating ambient temperature parameter, and according to described bridge-type pressure difference signal, the non-linear frequency drift of quartz crystal unit is carried out second compensation；Described first frequency signal is delivered to quantized system process, to obtain quantum deviation correcting signal, and according to described quantum deviation correcting signal, the output frequency of quartz crystal unit is rectified a deviation.
Optional: the frequency of described first frequency signal is 10KHz；And/or, the frequency of described second frequency signal is 10KHz.
The invention provides a kind of device for time reference, described device includes: oscillator signal generation module, is used for producing oscillator signal；First frequency signal acquisition module, for obtaining first frequency signal after described oscillator signal frequency-selecting amplification and signal shaping；GPS deviation correcting signal acquisition module, for by the second frequency signal from gps antenna, carrying out phase demodulation with described first frequency signal, it is thus achieved that GPS deviation correcting signal；Single compensation module, for adjusting the frequency of described oscillator signal, so that the drift of the non-linear frequency of quartz crystal unit is carried out single compensation according to described GPS deviation correcting signal；Second compensation module, for detecting the operating ambient temperature parameter of the signal source for producing described oscillator signal, obtain bridge-type pressure difference signal according to described operating ambient temperature parameter, and according to described bridge-type pressure difference signal, the non-linear frequency drift of quartz crystal unit is carried out second compensation；Correction module, processes for described first frequency signal is delivered to quantized system, to obtain quantum deviation correcting signal, and according to described quantum deviation correcting signal, the output frequency of quartz crystal unit is rectified a deviation.
Beneficial effect:
The system of a kind of time reference provided by the invention, is used for producing oscillator signal by crystal oscillator；The input of frequency-selective amplifier is connected with described crystal oscillator, receives described oscillator signal and frequency-selecting is amplified；Signal transformation circuit is connected with the outfan of described frequency-selective amplifier, so that the described oscillator signal after frequency-selecting is amplified is carried out signal shaping, obtains first frequency signal；The input of isolated amplifier is connected with described signal transformation circuit, described first frequency signal is at least delivered to following receptor: quantized system, frequency divider；GPS receives the frequency signal from gps antenna, obtains second frequency signal；Phase discriminator is connected with described GPS and described frequency divider respectively, receives and compares the phase contrast between described first frequency signal and described second frequency signal, to produce GPS deviation correcting signal；Loop filter is connected with described phase discriminator and described crystal oscillator respectively, the frequency of described crystal oscillator is carried out Primary regulation according to described GPS deviation correcting signal；Temperature compensator is distributed in the peripheral position of described crystal oscillator, and the operating ambient temperature change detecting described crystal oscillator produces bridge-type pressure difference signal；Microcontroller is connected with described quantized system, described crystal oscillator and described temperature compensator respectively, according to the quantum deviation correcting signal received the frequency of described crystal oscillator carried out Secondary Control, and according to the bridge-type pressure difference signal received, the frequency of described crystal oscillator is carried out three times and regulate.Finally realize the non-linear frequency drift to quartz crystal unit.There is simple in construction, the feature of wide adaptability.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment will be briefly described below, 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 premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The structured flowchart of the system of the time reference that Fig. 1 provides for the embodiment of the present invention；
The structured flowchart schematic diagram of temperature compensator in Fig. 1 that Fig. 2 provides for the embodiment of the present invention；
The structured flowchart schematic diagram of crystal oscillator in Fig. 1 that Fig. 3 provides for the embodiment of the present invention；
The method flow schematic diagram for time reference that Fig. 4 provides for the embodiment of the present invention；
The device block diagram for time reference that Fig. 5 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain, broadly fall into the scope of protection of the invention；Wherein involved in this enforcement "and/or" key word, represent and or two kinds of situations, in other words, A and/or B mentioned by the embodiment of the present invention, illustrates A and B, two kinds of situations of A or B, describes three kinds of states existing for A and B, such as A and/or B, expression: only include A and do not include B；Only include B and do not include A；Including A and B.
Meanwhile, in the embodiment of the present invention, when assembly is referred to as " being fixed on " another assembly, it can directly on another assembly or can also there is assembly placed in the middle.When an assembly is considered as " connection " another assembly, it can be directly to another assembly or may be simultaneously present assembly placed in the middle.When an assembly is considered as " being arranged at " another assembly, it can be set directly on another assembly or may be simultaneously present assembly placed in the middle.The term " vertical ", " level ", "left", "right" and the similar statement that use in the embodiment of the present invention are merely for purposes of illustration, and are not intended to the restriction present invention.
Refer to Fig. 1-3, the system of a kind of time reference that one embodiment of the invention provides, at least include: crystal oscillator 100, signal processor 110, GPS 140, phase discriminator 150, loop filter 160, quantized system 130, frequency divider 120, temperature compensator 170 and microcontroller 180.
Specifically, crystal oscillator 100 is connected with signal processor 110, make the oscillator unit that crystal oscillator 100 is placed in isoperibol produce oscillator signal, after signal processor 110 signal processing, obtain oscillator signal be transmitted separately to quantized system 130, (DDS) frequency divider 120 and external.
As preferably, the signal processor 110 in the embodiment of the present invention may include that frequency-selective amplifier 111, signal transformation circuit 112 and isolated amplifier 113.Wherein, the input of described frequency-selective amplifier 111 is connected with described crystal oscillator 100, receives described oscillator signal and frequency-selecting is amplified.Described signal transformation circuit 112 is connected with the outfan of described frequency-selective amplifier 111, so that the described oscillator signal after frequency-selecting is amplified is carried out signal shaping, obtains the first frequency signal of 10KHz.The input of described isolated amplifier 113 is connected with described signal transformation circuit 112, and described first frequency signal is at least delivered to following receptor: quantized system 130, (DDS) frequency divider 120.
Certainly, those skilled in the art are clearly understood that, signal processor 110 in the embodiment of the present invention is only undertaken processing the first frequency signal obtaining 10KHz by oscillator signal produced by crystal oscillator 100, not to concrete parts such as frequency-selective amplifier 111 in signal processor 110, signal transformation circuit 112 and isolated amplifier 113 limit.In other words; as long as oscillator signal produced by crystal oscillator 100 can carry out processing the signal processor 110 of the first frequency signal obtaining 10KHz; no matter whether it is by frequency-selective amplifier 111; signal transformation circuit 112 and isolated amplifier 113 are constituted, and it is all within protection scope of the present invention.
Further, in the embodiment of the present invention, GPS 140 is for receiving the frequency signal from gps antenna, obtains the second frequency signal of 10KHz.Phase discriminator 150 is connected with described GPS and described frequency divider respectively, receives and compares the phase contrast between described first frequency signal and described second frequency signal, to produce GPS deviation correcting signal.Loop filter 160 is connected with described phase discriminator 150 and described crystal oscillator 100 respectively, the frequency of described crystal oscillator 100 is carried out Primary regulation according to described GPS deviation correcting signal；The frequency and the phase place that make crystal oscillator 100 all keep determining relation with the input signal of GPS 140.This determines that relation can be when crystal oscillator 100 exports signal and GPS frequency input signal is equal, and their instantaneous phase difference is a constant；Otherwise, if they instantaneous phase differences are a constant, then input signal and output signal frequency are equal.
Simultaneously, the first frequency signal of 10KHz transmits to quantized system 130, need the frequency multiplication through atomic frequency standard circuit part, comprehensive, obtain atomic clock atomic ground state 0-0 jump frequency after microwave mixer and act on atom, after quantized system 130 frequency discrimination effect, obtain a quantum deviation correcting signal, in order to judge now whether this microwave frequency is directed at atomic ground state 0-0 jump frequency, and act on crystal oscillator 100 by microcontroller 180, produce quantum correction.It addition, described temperature compensator 170 is distributed in the peripheral position of described crystal oscillator 100, and the operating ambient temperature change detecting described crystal oscillator 100 in real time produces bridge-type pressure difference signal.Namely, described microcontroller 180 is connected with described quantized system 130, described crystal oscillator 100 and described temperature compensator 170 respectively, according to the quantum deviation correcting signal received the frequency of described crystal oscillator 100 carried out Secondary Control, and according to the bridge-type pressure difference signal received, the frequency of described crystal oscillator 100 is carried out three times and regulate.Finally realize the non-linear frequency drift to quartz crystal unit.
In the embodiment of the present invention, continuing with referring to Fig. 2, described temperature compensator 170 at least includes: bridge temperature measurement circuit 170a, the first voltage follower 170b, the second voltage follower 170c, difference amplifier 170d and gain linearity regulate circuit 170e.Wherein, the first voltage follower 170b and the second voltage follower 170c is connected with described bridge temperature measurement circuit 170a respectively.And embodiment of the present invention jackshaft channel Temperature Measuring circuit 170 main R, an a preset temperature value thermistor (temperature) sensor Ro and temperature-measuring thermistor R identical by two resistanceskComposition.Wherein, when semiconductor components and devices operating ambient temperature is constant, i.e. critesistor RkMeasured value equal with preset value Ro, now A, B end output voltage difference of bridge temperature measurement circuit 170 will be 0, and whole temperature-compensating outfan Uout is output as 0.When semiconductor components and devices operating ambient temperature changes, then A, B end of bridge temperature measurement circuit 170 forms certain voltage difference, deliver to difference amplifier 170d by the first voltage follower 170b and the second voltage follower 170c transmission and carry out differential amplification, and can effectively gather for the ease of the voltage difference after amplifying, therefore the embodiment of the present invention sets up described gain linearity adjustment circuit 170e at the outfan of difference amplifier 170d.The temperature-compensated voltage difference Uout obtained acts on and crystal oscillator 100 through voltage-controlled voltage, by the change of quartz crystal unit series electrical capacity, the non-linear frequency drift to quartz crystal unit after delivering to microprocessor 180 process.
For crystal oscillator 100, may include that starting of oscillation subcircuit 100a, critesistor 100b, varactor group 100c in embodiments of the present invention.Wherein, starting of oscillation subcircuit 100a is connected with temperature compensator 170, signal processor 110 respectively, and critesistor 100b is connected with described starting of oscillation subcircuit 100a, and varactor group 100c is connected with described starting of oscillation subcircuit.As preferably, varactor group 100c can include the first varactor 100c1, the second varactor 100c2 and the three varactor 100c3.
Specifically, on the one hand, the GPS deviation correcting signal that the first frequency signal of the second frequency signal and crystal oscillator 100 generation that come from GPS 140 generation obtains after passing through phase discriminator 150, act on the first varactor 100c1 concatenated mutually with quartz crystal unit, by the change of quartz crystal unit series electrical capacity, the non-linear frequency drift of quartz crystal unit is carried out single compensation.Another aspect, come from the bridge-type pressure difference signal in temperature compensator 170, that reflects the operating ambient temperature information of crystal oscillator 100 peripheral component, after being fed to microprocessor 180, the treated voltage-controlled voltage obtained acts on the second varactor 100c2 concatenated mutually with quartz crystal unit, by the change of quartz crystal unit series electrical capacity, the non-linear frequency drift of quartz crystal unit is carried out second compensation.Another further aspect, come from the quantum deviation correcting signal of quantized system 130, that reflects after the 10MHz of crystal oscillator 100 delivers to quantized system 130, frequency multiplication, comprehensive through atomic frequency standard circuit part, after microwave mixer, whether microwave frequency is directed at atomic ground state 0-0 jump frequency information, process, through microprocessor 180, the voltage-controlled voltage obtained and act on the 3rd varactor 100c3 concatenated mutually with quartz crystal unit, by the change of quartz crystal unit series electrical capacity, the output 10MHz signal frequency of quartz crystal unit is rectified a deviation.
As preferably, in the embodiment of the present invention, described GPS at least includes the Jupiter12 series TU35-D410-021GPS module of NAVMAN company；It has integrated LNA, supports active and passive antenna, and this module provides the 10KHz rate-adaptive pacemaker Tong Bu with 1PPS signal, and time precision is better than 100ns.Described phase discriminator is the current mode phase discriminator selecting PHILIPS Co.'s model to be 74HCT9046AIC, and its circuit design makes the input-output characteristic of phase discriminator be difficult to dead band occur, it is possible to constitute high-precision PLL.
Another embodiment of the present invention provides the equipment of a kind of time reference, and described equipment includes: GPS, for receiving the frequency signal from gps antenna, obtains second frequency signal；Phase discriminator, is connected with GPS and frequency divider respectively, receives and compares the phase contrast between the first frequency signal produced by crystal oscillator and described second frequency signal, to produce GPS deviation correcting signal；Loop filter, is connected with described phase discriminator and described crystal oscillator respectively, the frequency of described crystal oscillator is carried out Primary regulation according to described GPS deviation correcting signal；Temperature compensator, described temperature compensator is distributed in the peripheral position of described crystal oscillator, and the operating ambient temperature according to described crystal oscillator changes generation bridge-type pressure difference signal；Microcontroller, described microcontroller is connected with quantized system, described crystal oscillator and described temperature compensator respectively, according to the quantum deviation correcting signal received the frequency of described crystal oscillator carried out Secondary Control, and bridge-type pressure difference signal according to described reception the frequency of described crystal oscillator carried out three times regulate.
It should be noted that, in the equipment of another embodiment of the present invention time reference, GPS, phase discriminator, loop filter, temperature compensator, microcontroller and each GPS in the system of time reference, phase discriminator, loop filter, temperature compensator, microcontroller are identical, repeating no more, not detailed part refers to the detailed description of each several part in the system embodiment of time reference herein.
Referring to Fig. 4, one more embodiment of the present invention provides a kind of method for time reference, and described method at least comprises the steps:
Step 201: produce oscillator signal；This step 201, it is possible to produce step as the signal in the embodiment of the method for time reference, is produced oscillator signal by the oscillator unit being placed in crystal oscillator in sad temperature environment.
Step 201: to obtaining first frequency signal after described oscillator signal frequency-selecting amplification and signal shaping；Wherein, produced by crystal oscillator, oscillator signal obtains first frequency signal after frequency-selective amplifier, signal transformation circuit.The signal value of this first frequency signal is 10khz.
Step 203: by the second frequency signal from gps antenna, carries out phase demodulation with described first frequency signal, it is thus achieved that GPS deviation correcting signal；
Step 204: adjust the frequency of described oscillator signal according to described GPS deviation correcting signal, to carry out single compensation to the drift of the non-linear frequency of quartz crystal unit；
Step 205: detection is for producing the operating ambient temperature parameter of the signal source of described oscillator signal, obtain bridge-type pressure difference signal according to described operating ambient temperature parameter, and according to described bridge-type pressure difference signal, the non-linear frequency drift of quartz crystal unit is carried out second compensation；
Step 206: described first frequency signal is delivered to quantized system and processes, to obtain quantum deviation correcting signal, and according to described quantum deviation correcting signal, the output frequency of quartz crystal unit is rectified a deviation.
Specifically, receive the frequency signal from gps antenna by GPS in step 203, obtain the second frequency signal of 10KHz.Phase discriminator receives and compares the phase contrast between described first frequency signal and described second frequency signal, to produce GPS deviation correcting signal.Loop filter is to carry out Primary regulation according to described GPS deviation correcting signal to the frequency of described crystal oscillator 100 in step 204；The frequency and the phase place that make crystal oscillator 100 all keep determining relation with the input signal of GPS 140.This determines that relation can be when crystal oscillator 100 exports signal and GPS frequency input signal is equal, and their instantaneous phase difference is a constant；Otherwise, if they instantaneous phase differences are a constant, then input signal and output signal frequency are equal.Simultaneously, in step 206, the first frequency signal of 10KHz transmits to quantized system, need the frequency multiplication through atomic frequency standard circuit part, comprehensive, obtain atomic clock atomic ground state 0-0 jump frequency after microwave mixer and act on atom, after quantized system frequency discrimination effect, obtain a quantum deviation correcting signal, in order to judge now whether this microwave frequency is directed at atomic ground state 0-0 jump frequency, and act on crystal oscillator by microcontroller, produce quantum correction.It addition, in step 205, it is distributed in the peripheral position of described crystal oscillator by temperature compensator, and the operating ambient temperature change detecting described crystal oscillator in real time produces bridge-type pressure difference signal.Namely, microcontroller is connected with described quantized system, described crystal oscillator and described temperature compensator respectively, according to the quantum deviation correcting signal received the frequency of described crystal oscillator carried out Secondary Control, and according to the bridge-type pressure difference signal received, the frequency of described crystal oscillator is carried out three times and regulate.Finally realize the non-linear frequency drift to quartz crystal unit.
Finally, referring to Fig. 5, the present invention, based on the above-mentioned embodiment of the method for time reference, additionally provides a kind of device for time reference, and described device includes: oscillator signal generation module, is used for producing oscillator signal；First frequency signal acquisition module, for obtaining first frequency signal after described oscillator signal frequency-selecting amplification and signal shaping；GPS deviation correcting signal acquisition module, for by the second frequency signal from gps antenna, carrying out phase demodulation with described first frequency signal, it is thus achieved that GPS deviation correcting signal；Single compensation module, for adjusting the frequency of described oscillator signal, so that the drift of the non-linear frequency of quartz crystal unit is carried out single compensation according to described GPS deviation correcting signal；Second compensation module, processes for described first frequency signal is delivered to quantized system, to obtain quantum deviation correcting signal, and according to described quantum deviation correcting signal, the non-linear frequency drift of quartz crystal unit is carried out second compensation；Three compensating modules, for detecting the operating ambient temperature parameter of the signal source for producing described oscillator signal, obtain bridge-type pressure difference signal according to described operating ambient temperature parameter, and according to described bridge-type pressure difference signal, the non-linear frequency drift of quartz crystal unit is carried out three compensation.
It should be noted that device embodiment provided by the invention is corresponding with embodiment of the method, repeating no more, the non-detailed portion of device embodiment refers to embodiment of the method herein.
Although preferred embodiments of the present invention have been described, but those skilled in the art are once know basic creative concept, then these embodiments can be made other change and amendment.So, claims are intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, the present invention can be carried out various change and modification without deviating from the spirit and scope of the present invention by those skilled in the art.So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
As seen through the above description of the embodiments, those skilled in the art is it can be understood that can add the mode of required general hardware platform by software to the present invention and realize.Based on such understanding, the part that prior art is contributed by technical scheme substantially in other words can embody with the form of software product, this computer software product can be stored in storage medium, such as ROM/RAM, magnetic disc, CD etc., including some instructions with so that a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
Each embodiment in this specification all adopts the mode gone forward one by one to describe, between each embodiment identical similar part mutually referring to, what each embodiment stressed is the difference with other embodiments.Especially for device or system embodiment, owing to it is substantially similar to embodiment of the method, so describing fairly simple, relevant part illustrates referring to the part of embodiment of the method.Apparatus and system embodiment described above is merely schematic, the wherein said module illustrated as separating component can be or may not be physically separate, the parts shown as unit can be or may not be physical location, namely may be located at a place, or can also be distributed on multiple NE.Some or all of module therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
Above to the system of time reference provided by the present invention, equipment, for the method for time reference and device, it is described in detail, principles of the invention and embodiment are set forth by specific case used herein, and the explanation of above example is only intended to help to understand method and the core concept thereof of the present invention；Simultaneously for one of ordinary skill in the art, according to the thought of the present invention, all will change in specific embodiments and applications.In sum, this specification content should not be construed as limitation of the present invention.
Claims (10)
1. the system of a time reference, it is characterised in that including:
Crystal oscillator, is used for producing oscillator signal；
Signal processor, described signal processor includes:
Frequency-selective amplifier, the input of described frequency-selective amplifier is connected with described crystal oscillator, receives described oscillator signal and frequency-selecting is amplified；
Signal transformation circuit, described signal transformation circuit is connected with the outfan of described frequency-selective amplifier, so that the described oscillator signal after frequency-selecting is amplified is carried out signal shaping, obtains first frequency signal；
Isolated amplifier, the input of described isolated amplifier is connected with described signal transformation circuit, described first frequency signal is at least delivered to following receptor: quantized system, frequency divider；
GPS, for receiving the frequency signal from gps antenna, obtains second frequency signal；
Phase discriminator, is connected with described GPS and described frequency divider respectively, receives and compares the phase contrast between described first frequency signal and described second frequency signal, to produce GPS deviation correcting signal；
Loop filter, is connected with described phase discriminator and described crystal oscillator respectively, the frequency of described crystal oscillator is carried out Primary regulation according to described GPS deviation correcting signal；
Temperature compensator, described temperature compensator is distributed in the peripheral position of described crystal oscillator, and the operating ambient temperature change detecting described crystal oscillator produces bridge-type pressure difference signal；
Microcontroller, described microcontroller is connected with described quantized system, described crystal oscillator and described temperature compensator respectively, according to the quantum deviation correcting signal received the frequency of described crystal oscillator carried out Secondary Control, and according to the bridge-type pressure difference signal received, the frequency of described crystal oscillator is carried out three times and regulate.
2. the equipment of a time reference, it is characterised in that including:
GPS, for receiving the frequency signal from gps antenna, obtains second frequency signal；
Phase discriminator, is connected with GPS and frequency divider respectively, receives and compares the phase contrast between the first frequency signal produced by crystal oscillator and described second frequency signal, to produce GPS deviation correcting signal；
Loop filter, is connected with described phase discriminator and described crystal oscillator respectively, the frequency of described crystal oscillator is carried out Primary regulation according to described GPS deviation correcting signal；
Temperature compensator, described temperature compensator is distributed in the peripheral position of described crystal oscillator, and the operating ambient temperature according to described crystal oscillator changes generation bridge-type pressure difference signal；
Microcontroller, described microcontroller is connected with quantized system, described crystal oscillator and described temperature compensator respectively, according to the quantum deviation correcting signal received the frequency of described crystal oscillator carried out Secondary Control, and bridge-type pressure difference signal according to described reception the frequency of described crystal oscillator carried out three times regulate.
3. the equipment of time reference as claimed in claim 2, it is characterised in that:
Described GPS at least includes the Jupiter12 series TU35-D410-021GPS module of NAVMAN company.
4. the equipment of time reference as claimed in claim 2, it is characterised in that:
Described phase discriminator is the current mode phase discriminator selecting PHILIPS Co.'s model to be 74HCT9046AIC.
5. equipment as claimed in claim 4, it is characterised in that described crystal oscillator includes:
Starting of oscillation subcircuit, is connected with described temperature compensator；
Critesistor, is connected with described starting of oscillation subcircuit；
Varactor group, is connected with described starting of oscillation subcircuit；
Wherein, changed by the capacitance of the change in resistance of described critesistor and described varactor group, to offset or to cut down the temperature drift of frequency of oscillation.
6. equipment as claimed in claim 5, it is characterised in that described varactor group includes:
First varactor；
Second varactor；
3rd varactor；
Wherein, described first varactor, described second varactor, the 3rd varactor are connected with described starting of oscillation subcircuit respectively, and received from non-linear frequency drift to quartz crystal unit of the GPS deviation correcting signal of phase discriminator by described first varactor, received from non-linear frequency drift to quartz crystal unit of the bridge-type pressure difference signal of described temperature compensator by described second varactor, described 3rd varactor receive the non-linear frequency drift to quartz crystal unit of the quantum deviation correcting signal from quantized system.
7. equipment as claimed in claim 6, it is characterised in that described temperature compensator includes:
Bridge temperature measurement circuit；
First voltage follower, is connected with described bridge temperature measurement circuit；
Second voltage follower, is connected with described bridge temperature measurement circuit；
Difference amplifier, is connected with described first voltage follower, the second voltage follower respectively；
Gain linearity regulates circuit, is connected with described difference amplifier and described microcontroller respectively；
Wherein, regulate circuit by gain linearity and obtain temperature-compensated voltage, and transmit to after described microcontroller, by described second varactor according to the described temperature-compensated voltage non-linear frequency drift to quartz crystal unit.
8. the method for time reference, it is characterised in that described method includes:
Produce oscillator signal；
To obtaining first frequency signal after described oscillator signal frequency-selecting amplification and signal shaping；
By the second frequency signal from gps antenna, carry out phase demodulation with described first frequency signal, it is thus achieved that GPS deviation correcting signal；
The frequency of described oscillator signal is adjusted, so that the drift of the non-linear frequency of quartz crystal unit is carried out single compensation according to described GPS deviation correcting signal；
Detection, for producing the operating ambient temperature parameter of the signal source of described oscillator signal, obtains bridge-type pressure difference signal according to described operating ambient temperature parameter, and according to described bridge-type pressure difference signal, the non-linear frequency drift of quartz crystal unit is carried out second compensation；
Described first frequency signal is delivered to quantized system process, to obtain quantum deviation correcting signal, and according to described quantum deviation correcting signal, the output frequency of quartz crystal unit is rectified a deviation.
9. the method for time reference as claimed in claim 8, it is characterised in that:
The frequency of described first frequency signal is 10KHz；
And/or,
The frequency of described second frequency signal is 10KHz.
10. the device for time reference, it is characterised in that described device includes:
Oscillator signal generation module, is used for producing oscillator signal；
First frequency signal acquisition module, for obtaining first frequency signal after described oscillator signal frequency-selecting amplification and signal shaping；
GPS deviation correcting signal acquisition module, for by the second frequency signal from gps antenna, carrying out phase demodulation with described first frequency signal, it is thus achieved that GPS deviation correcting signal；
Single compensation module, for adjusting the frequency of described oscillator signal, so that the drift of the non-linear frequency of quartz crystal unit is carried out single compensation according to described GPS deviation correcting signal；
Second compensation module, for detecting the operating ambient temperature parameter of the signal source for producing described oscillator signal, obtain bridge-type pressure difference signal according to described operating ambient temperature parameter, and according to described bridge-type pressure difference signal, the non-linear frequency drift of quartz crystal unit is carried out second compensation；
Correction module, processes for described first frequency signal is delivered to quantized system, to obtain quantum deviation correcting signal, and according to described quantum deviation correcting signal, the output frequency of quartz crystal unit is rectified a deviation.
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| CN107332556A (en) * | 2017-06-16 | 2017-11-07 | 江汉大学 | Ji Yuan when a kind of High Precision Gain is compensation |
| CN109873636A (en) * | 2019-03-27 | 2019-06-11 | 维沃移动通信有限公司 | Frequency adjusting method and mobile terminal |
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Application publication date: 20160706 |