CN104410414A - Relaxation time based signal control device and method - Google Patents
Relaxation time based signal control device and method Download PDFInfo
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- CN104410414A CN104410414A CN201410695902.1A CN201410695902A CN104410414A CN 104410414 A CN104410414 A CN 104410414A CN 201410695902 A CN201410695902 A CN 201410695902A CN 104410414 A CN104410414 A CN 104410414A
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Abstract
The invention discloses a relaxation time based signal control device and method and belongs to the field of atomic frequency standard. The relaxation time based signal control method includes steps of acquiring loop response time of the device; determining the relaxation time of the device; adjusting frequency of modulation signals and synchronous signals according to the relaxation time to obtain modified modulation signals and synchronous signals, wherein the frequency of the modified modulation signals and the modified synchronous signals is 1/10-1/2 times of the reciprocal of the relaxation time; generating new quantum frequency discrimination signals according to the modified modulation signals; adjusting phase of the modified modulation signals or the modified synchronous signals according to first user commands so that the instability state of the quantum frequency discrimination signals is included in the stability state of the modified synchronous signals. By adjusting the phase of the modulation signals or the synchronous signals, the instability state of the new quantum frequency discrimination signals stays in the stability state of the stability state of the synchronous signals, so that the sampling signals can be conveniently and accurately analyzed.
Description
Technical field
The present invention relates to field of atomic frequency standard, particularly a kind of signal control device based on the relaxation time and method.
Background technology
(the time that namely in system, certain variable is tended towards stability required for state by labile state in relaxation time of atomic clock, such as, change-over time required when signal is converted to stable low level from stable high level) reflect the speed degree of the physical system response external pumping signal of an atomic clock, because it is form with semiconductor that existing electronic circuit has, electrical transmission speed is quite high, therefore for whole system, relaxation time determines the limiting value of the loop response time of system closed loop to a great extent, this to research staff in subsequent servo module, the adjustment of synchronizing signal phase place is very helpful.
The relaxation time of atomic clock of the prior art is generally theoretical by Atomic Physics, rule of thumb carries out the theoretical estimated value estimating to obtain.Because the electric field in each atomic clock system, magnetic field, radiofrequency field and temperature field etc. are not quite similar, each atomic clock system relaxation time separately also all differs widely, therefore, the low and high level that the quantum frequency discrimination signal of sampling and synchronizing signal exist quantum frequency discrimination signal changes the situation of the time range that the low and high level that is positioned at synchronizing signal changes, this sampled signal is not easy to analyze, and then causes analysis result inaccurate.
Summary of the invention
Analyzing inaccurate problem to solve sampled signal in prior art, embodiments providing a kind of signal control device based on the relaxation time and method.Described technical scheme is as follows:
On the one hand, embodiments provide a kind of signal control device based on the relaxation time, described device comprises: comprise quantized system, servo loop, processor, VCXO VCXO and signal processing circuit, the output signal that described processor controls modulation signal and the described VCXO exported obtains microwave interrogation signals simultaneously after described signal processing circuit, described microwave interrogation signals generates quantum frequency discrimination signal after described quantized system, described servo loop is used for that described quantum frequency discrimination signal is carried out phase demodulation and obtains synchronous phase discrimination signal, described processor produces synchronizing signal while the described modulation signal of generation,
Described processor is also for obtaining the loop response time of described device;
According to the described loop response time, determine the relaxation time of described device;
According to the described relaxation time, the frequency of synchronizing signal described in the frequency regulating described modulation signal, modulation signal after being changed and the synchronizing signal after changing, the frequency of the modulation signal after described change is 1/10 ~ 1/2 times of described relaxation time inverse, and the frequency of the synchronizing signal after described change is identical with the frequency of the modulation signal after described change;
According to the modulation signal after described change, obtain new quantum frequency discrimination signal;
Regulate the phase place of the synchronizing signal after the phase place of the modulation signal after described change or described change according to first user instruction, make the labile state of described new quantum frequency discrimination signal be positioned at the stable state of the synchronizing signal after described change.
Further, described device also comprises:
Acquisition module, for quantum frequency discrimination signal new according to the synchronous signal acquisition after described change;
Signal Monitor, for showing the synchronizing signal after described change and described new quantum frequency discrimination signal, obtains showing result;
Receiver module, for receiving the described first user instruction obtained according to described display result of user's input.
Further, described device also comprises ring oscillator, for by anti-phase for the output signal of described servo loop rear output;
Described processor also for obtaining the cycle of described ring oscillator, and obtains the cycle of the oscillating loop that described quantized system, described servo loop, described processor and described ring oscillator are formed;
Described processor also for according to the cycle of described ring oscillator and the cycle of described oscillating loop, determines the loop response time of described device.
Alternatively, in described servo loop, be provided with phase sensitive amplifier, for described synchronous phase discrimination signal is converted to voltage control signal;
Described device also comprises: digital to analog converter, after described voltage control signal is converted to analog signal, exports to described VCXO.
Alternatively, described device also comprises: phase shifter, and for regulating the phase shift of described voltage control signal according to the second user instruction, described second user instruction is inputted by described receiver module according to described display result by user.
On the other hand, embodiments provide a kind of signal control method based on the relaxation time, adopt device as described in relation to the first aspect to realize, described method comprises:
Obtain the loop corresponding time of described device;
According to the described loop response time, determine the relaxation time of described device;
According to the described relaxation time, regulate the frequency of the frequency of described modulation signal and described synchronizing signal, modulation signal after being changed and the synchronizing signal after changing, the frequency of the modulation signal after described change is 1/10 ~ 1/2 times of described relaxation time inverse, and the frequency of the synchronizing signal after described change is identical with the frequency of the modulation signal after described change;
According to the modulation signal after described change, obtain new quantum frequency discrimination signal;
Regulate the phase place of the synchronizing signal after the phase place of the modulation signal after described change or described change according to first user instruction, make the labile state of described new quantum frequency discrimination signal be positioned at the stable state of the synchronizing signal after described change.
Preferably, described method comprises:
Quantum frequency discrimination signal new according to the synchronous signal acquisition after described change;
Show the synchronizing signal after described change and described new quantum frequency discrimination signal, obtain showing result;
Receive the described first user instruction obtained according to described display result of user's input.
Further, in the relaxation time of the described device of described acquisition, comprising:
Obtain the cycle of ring oscillator and the cycle of oscillating loop;
According to the cycle of described ring oscillator and the cycle of described oscillating loop, determine the loop response time of described device.
Alternatively, described method also comprises:
Receive the second user instruction of user's input, described second user instruction is inputted according to described display result by user;
According to described second user instruction, the phase shift of regulation voltage control signal, described voltage control signal obtains according to synchronous phase discrimination signal.
Preferably, the frequency of described modulation signal is 1/5 times or 1/10 times of described relaxation time inverse.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
By obtaining the relaxation time of atomic clock, after the frequency of modulation signal export processor and the frequency of synchronizing signal are adjusted to the several times of relaxation time inverse simultaneously, obtain new quantum frequency discrimination signal, and the phase place of the modulation signal after changing or the synchronizing signal after changing is regulated according to user instruction, the labile state of quantum frequency discrimination signal (i.e. low and high level change region) is made to be positioned at the region (i.e. high level region or low level region) of the stable state of the synchronizing signal after change, be convenient to analyze sampled signal, and then improve precision of analysis.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of signal control device based on the relaxation time that the embodiment of the present invention one provides;
Fig. 2 is the structural representation of a kind of signal control device based on the relaxation time that the embodiment of the present invention two provides;
Fig. 3 is the Output rusults schematic diagram of the quantum frequency discrimination signal that the embodiment of the present invention two provides;
Fig. 4 is the flow chart of a kind of signal control method based on the relaxation time that the embodiment of the present invention three provides;
Fig. 5 is the flow chart of a kind of signal control method based on the relaxation time that the embodiment of the present invention four provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment one
Embodiments provide a kind of signal control device based on the relaxation time, see Fig. 1, this device comprises: quantized system 11, servo loop 12, processor 13, VCXO (Voltage Controlled X'tal (crystal) Oscillator, VCXO) 14 and signal processing circuit 15, the output signal of the modulation signal that processor 13 exports and VCXO 14 obtains microwave interrogation signals simultaneously after signal processing circuit 15, microwave interrogation signals generates quantum frequency discrimination signal after quantized system 11, servo loop 12 obtains synchronous phase discrimination signal for quantum frequency discrimination signal is carried out phase demodulation, processor 13 produces synchronizing signal while generation modulation signal, processor 13 can also be used for the loop response time obtaining this device,
According to the loop response time, the relaxation time of determining device;
According to the relaxation time, regulate the frequency of modulation signal and the frequency of synchronizing signal, the modulation signal after being changed and the synchronizing signal after changing; Wherein, the frequency of the modulation signal after change is 1/10 ~ 1/2 times of relaxation time inverse, and the frequency of the synchronizing signal after change is identical with the frequency of the modulation signal after change;
According to the modulation signal after change, obtain new quantum frequency discrimination signal;
Regulate the phase place of the modulation signal after changing or the phase place of synchronizing signal after changing according to first user instruction, make the labile state of new quantum frequency discrimination signal be positioned at the stable state of the synchronizing signal after change.
When realizing, this device can be atomic clock (i.e. atomic frequency standard).
The embodiment of the present invention is by obtaining the relaxation time of atomic clock, after the frequency of modulation signal export processor and the frequency of synchronizing signal are adjusted to the several times of relaxation time inverse simultaneously, obtain new quantum frequency discrimination signal, and the phase place of the modulation signal after changing or the synchronizing signal after changing is regulated according to user instruction, the labile state of quantum frequency discrimination signal (i.e. low and high level change region) is made to be positioned at the region (i.e. high level region or low level region) of the stable state of the synchronizing signal after change, be convenient to analyze sampled signal, and then improve precision of analysis.
Embodiment two
Embodiments provide a kind of signal control device based on the relaxation time, see Fig. 2, this device comprises: quantized system 21, servo loop 22, processor 23, VCXO 24, signal processing circuit 25, ring oscillator 26, phase shifter 27, D/A (Digital to Analog, modulus) transducer 28, sampling module 29, Signal Monitor 30 and receiver module 31, the output signal of the modulation signal that processor 23 exports and VCXO 24 obtains microwave interrogation signals simultaneously after signal processing circuit 25, microwave interrogation signals generates quantum frequency discrimination signal after quantized system 21, servo loop 22 obtains synchronous phase discrimination signal in quantum frequency discrimination signal is carried out phase demodulation, processor 23 produces synchronizing signal while generation modulation signal, processor 23 can also be used for the loop response time obtaining this device,
According to the loop response time, the relaxation time of determining device;
According to the relaxation time, regulate the frequency of modulation signal and the frequency of synchronizing signal, the modulation signal after being changed and the synchronizing signal after changing; Wherein, the frequency of the modulation signal after change is 1/10 ~ 1/2 times of relaxation time inverse, and the frequency of the synchronizing signal after change is identical with the frequency of the modulation signal after change;
According to the modulation signal after change, obtain new quantum frequency discrimination signal;
Regulate the phase place of the modulation signal after changing or the phase place of synchronizing signal after changing according to first user instruction, make the labile state of new quantum frequency discrimination signal be positioned at the stable state of the synchronizing signal after change.
When realizing, acquisition module 29 is for the quantum frequency discrimination signal new according to the synchronous signal acquisition after change;
Signal Monitor 30, for showing the synchronizing signal after change and new quantum frequency discrimination signal, obtains showing result;
Receiver module 31 is for receiving the first user instruction obtained according to display result of user's input.
Wherein, the stable state of synchronizing signal is high level or time zone (region in the synchronizing signal X in such as Fig. 3 between D point and D point) corresponding to low level, and the labile state of quantum frequency discrimination signal is high level and is converted to time zone corresponding to low level or low transition is the time zone (the A point in the quantum frequency discrimination signal Y in such as Fig. 3 and the region between B point) that high level is corresponding.When realizing, preferably the labile state of quantum frequency discrimination signal is adjusted to the high level being positioned at synchronizing signal or low level middle.Particularly, staff (i.e. user) can according to the display result of Signal Monitor 30, and artificial setting needs the phase place of the phase place of the modulation signal after the change regulated or the synchronizing signal after changing.
Preferably, the frequency of the modulation signal after change is set to 1/5 times or 1/10 times of relaxation time inverse.
In the present embodiment, in servo loop 22, be provided with phase sensitive amplifier 221, for synchronous phase discrimination signal is converted to voltage control signal.Phase shifter 27 is for the phase shift according to the second user instruction regulation voltage control signal, and the second user instruction is inputted according to display result by user.Particularly, staff (i.e. user) can according to the display result of Signal Monitor 30, and artificial setting voltage control signal needs the phase shift regulated.Digital to analog converter 28, for after voltage control signal is converted to analog signal, exports to VCXO 24.
Particularly, ring oscillator 26 is for by anti-phase for the output signal of servo loop 22 rear output;
Processor 23 is also for obtaining the cycle of ring oscillator 26, and the cycle of the oscillating loop 32 of amount to obtain subsystem 21, servo loop 22, processor 23 and ring oscillator 26 formation, and according to the cycle of ring oscillator 26 and the cycle of oscillating loop 32, the loop response time of determining device.
When realizing, ring oscillator 26 can be made up of odd number not gate, and the number of not gate is at least 3.This quantized system 21 at least comprises cavity bubble system 211, light source 212 and speed-sensitive switch (Shutter) 213.
Particularly, determine that the process of loop response time is as follows:
Suppose certain moment, the state of speed-sensitive switch 213 is "ON", the light that light source 211 encourages is by directly carrying out in cavity bubble system 211 after speed-sensitive switch 213, under the effect of conventional atom clock principle, the quantum frequency discrimination of performance subsystem 21 obtains quantum frequency discrimination signal, this quantum frequency discrimination signal acts on VCXO 24 on the one hand by obtaining output signal (i.e. voltage control signal) after servo loop 22 after phase shifter 27 and D/A converter 28, simultaneously, processor 21 also can control to generate modulation signal, feed back in ring oscillator 26 on the other hand, because quantized system 21 completes quantum frequency discrimination, so the signal outputting to ring oscillator 26 is high level " 1 ", this high level " 1 " becomes low level " 0 " behind the door through the odd number of ring oscillator 26 is non-, this low level " 0 " is applied to speed-sensitive switch 213 after processor 23, its state is made to become "Off", now quantized system 21 can not complete quantum frequency discrimination, the output signal of servo loop 22 is low level " 0 ", this low level " 0 " is changed to high level " 1 " after ring oscillator 26 can make the state of speed-sensitive switch become "ON" again, so far, complete the one-period of oscillating loop.In actual applications, the state that can detect double speed-sensitive switch by processor 23 is the time difference of "ON" or "Off", to obtain the cycle of oscillating loop.
Suppose that the cycle of oscillating loop 32 is T1, t average delay time of each not gate in ring oscillator 26, the number of not gate is N, according to the fundamental characteristics of ring oscillator, the cycle of ring oscillator 26 is 2Nt, then according to the cycle of ring oscillator 26 and the cycle of oscillating loop 32, the formula of the loop response time determined is as follows:
Δt＝(T1-2Nt)/2
Wherein, Δ t is the loop response time of device.
Can be learnt by above solution procedure, the loop response time was determined jointly by the response time (i.e. relaxation time) of quantized system 21 (being also physical system) and the response time of peripheral circuit (such as servo loop 22, processor 23 etc.).But in actual applications, because the response time of circuit quickly (reaches more than 10ns level) usually, so the response time of circuit is substantially negligible, namely the loop response time was determined by the relaxation time, therefore, in the present invention, think that the relaxation time approximates the loop response time.
In the present embodiment, signal processing circuit 25 can comprise digital frequency synthesizer 251, phase modulation frequency multiplier 252 and microwave are doubly, frequency mixer 253, this digital frequency synthesizer 251 is connected with processor 26, the input of phase modulation frequency multiplier 252 is connected with the output of digital frequency synthesizer 252 and VCXO 24 respectively, microwave doubly, the input of frequency mixer 253 is connected with the output of phase modulation frequency multiplier 252, processor 26 sends keying FM signal, control figure frequency synthesizer 251 with the cycle of this keying FM signal for the cycle alternately exports modulation signal, microwave interrogation signals is produced after the output signal SHG and THG of this modulation signal and VCXO 24.
As one citing, digital frequency synthesizer 251 can be DDS (Direct Digital Synthesizer, Direct Digital Synthesizer) chip, such as AD9852.Particularly, the external clock pin MCLK of DDS end can be held with the external clock pin XTAL of processor 23 and be connected, consistent with external clock reference with the stability of the IOUT pin output frequency signal making DDS.Inside be there is no to the DDS chip of PLL frequency multiplication link, the frequency in usual MCLK end input clock source should hold 4 times of output signal frequency higher than IOUT, such as IOUT pin output signal frequency is 5.3125MHz or 5.3123MHz, so the signal frequency of MCLK clock end should be greater than 20MHz, to expect to obtain better phase noise, after filtered external circuit, purer signal spectra can be obtained.The pin FSELECT of DDS holds as keying FM signal input, is connected with processor 23.Two frequency control register are had at DDS chip internal, the frequency value F 0 pre-set, F1 can be preserved in a register by the mode of programming, when FSELECT end has square-wave signal to input, the IOUT end of DDS will read the value of F1 or F0 as output thereupon respectively from frequency control register, and can ensure that frequency signal phase place when switching is unchanged.
In the present embodiment, when the keying FM signal of processor 23 elects 79Hz (i.e. the relaxation time of 5 times) as, can F0=5.3125MHz be set, F1=5.3123MHz.
Alternatively, servo loop 22 can also comprise frequency selective amplifier 222 sum-product intergrator 223.Frequency selective amplifier 222 exports to phase sensitive amplifier 221 after the output signal of quantized system 21 being carried out frequency-selecting and amplification, after integrator 223 filters for the alternating current component exported by phase sensitive amplifier 221, and output voltage control signal.
In the present embodiment, suppose that modulation signal is: S=Asin (2 π ft), wherein, A is amplitude is constant.
Then, light inspection first-harmonic exports and is:
Wherein,
equal 0 or 180 degree,
be the phase shift that phase modulation frequency multiplier 252 is introduced, AB is constant.
After frequency-selecting is amplified, signal expression is:
wherein,
be the phase shift of frequency selective amplifier 222, Ka is frequency-selecting gain amplifier.
Because the mathematical expression of phase sensitive detection is multiplier, after phase sensitive amplifier 221, signal is:
wherein, Kp is phase sensitivity gain amplifier.
Through the filter action of integrator 223, the alternating current component during phase sensitive amplifier 221 outputs signal will be filtered, and the voltage signal finally exported is:
Above-mentioned phase modulation frequency multiplier 252, frequency selective amplifier 222, phase sensitive amplifier 221, filter (i.e. integrator) 223 etc. all likely cause
change, and then cause the change in gain of atomic clock system, thus produce frequency drift, normally work to make atomic clock and there is maximum gain, phase shifter 27 must be added in systems in which to offset extra phase shift
in actual applications, due to phase shift
finally can the phase place of synchronizing signal in figure 3 and frequency discrimination signal change among embody, so staff (i.e. user) can show result by Signal Monitor 30, setting needs phase shift i.e. the second user instruction regulated, and to be controlled the extra phase shift in the voltage signal that exported by phase sensitive amplifier 221 of phase shifter 27 by processor 23 according to the second user instruction
offset.
It should be noted that, the frequency (such as 1/ (5* Δ t)) of the modulation signal chosen, the frequency of keying FM signal and the frequency of synchronizing signal, phase place be remain adjustable by processor 23 numeral.
The embodiment of the present invention is by obtaining the relaxation time of atomic clock, after the frequency of modulation signal export processor and the frequency of synchronizing signal are adjusted to the several times of relaxation time inverse simultaneously, obtain new quantum frequency discrimination signal, and the phase place of the modulation signal after changing or the synchronizing signal after changing is regulated according to user instruction, the labile state of quantum frequency discrimination signal (i.e. low and high level change region) is made to be positioned at the region (i.e. high level region or low level region) of the stable state of the synchronizing signal after change, be convenient to analyze sampled signal, and then improve precision of analysis, and the phase shift of voltage control signal can be changed according to user instruction, the extra phase shift that circuit in erasure signal treatment circuit and servo loop is introduced, thus the phase demodulation error effectively reduced between quantum frequency discrimination signal and synchronizing signal, and then also ensure that the accuracy of sampling analysis result.
Embodiment three
Embodiments provide a kind of signal control method based on the relaxation time, the method adopts as the device in embodiment one or two realizes, and see Fig. 4, the method comprises:
Step 401: the loop corresponding time of acquisition device.
Step 402: according to the loop response time, the relaxation time of determining device.
Step 403: according to the relaxation time, regulate the frequency of modulation signal and the frequency of synchronizing signal, modulation signal after being changed and the synchronizing signal after changing, the frequency of the modulation signal after change is 1/10 ~ 1/2 times of relaxation time inverse, and the frequency of the synchronizing signal after change is identical with the frequency of the modulation signal after change.
Step 404: according to the modulation signal after change, obtain new quantum frequency discrimination signal.
Step 405: regulate the phase place of the modulation signal after changing or the phase place of synchronizing signal after changing according to first user instruction, makes the labile state of new quantum frequency discrimination signal be positioned at the stable state of the synchronizing signal after change.
Wherein, first user instruction is inputted according to display result by user.
The embodiment of the present invention is by obtaining the relaxation time of atomic clock, after the frequency of modulation signal export processor and the frequency of synchronizing signal are adjusted to the several times of relaxation time inverse simultaneously, obtain new quantum frequency discrimination signal, and the phase place of the modulation signal after changing or the synchronizing signal after changing is regulated according to user instruction, the labile state of quantum frequency discrimination signal (i.e. low and high level change region) is made to be positioned at the region (i.e. high level region or low level region) of the stable state of the synchronizing signal after change, be convenient to analyze sampled signal, and then improve precision of analysis.
Embodiment four
Embodiments provide a kind of signal control method based on the relaxation time, the method adopts as the device in embodiment one or two realizes, and see Fig. 5, the method comprises:
Step 501: obtain the cycle of ring oscillator and the cycle of oscillating loop.
Wherein, ring oscillator is made up of odd number not gate, and the number of not gate is at least 3.
Step 502: according to the cycle of ring oscillator and the cycle of oscillating loop, the loop response time of determining device.
In the present embodiment, according to the cycle of ring oscillator and the cycle of oscillating loop, the loop response time of determining device, adopt following formulae discovery:
Δt＝(T1-2Nt)/2，
Wherein, Δ t is the loop response time of device, and T1 is the cycle of oscillating loop, and N is the number of the not gate in ring oscillator, and t is the average delay time of each not gate.
Step 503: according to the loop response time, determine the relaxation time.
The loop response time was determined jointly by the response time (i.e. relaxation time) of quantized system and the response time of peripheral circuit.But in actual applications, because the response time of circuit quickly (reaches more than 10ns level) usually, so the response time of circuit is substantially negligible, namely the loop response time was determined by the relaxation time, therefore, in the present invention, think that the relaxation time approximates the loop response time.
Step 504: according to the relaxation time, regulate the frequency of modulation signal and the frequency of synchronizing signal, modulation signal after being changed and the synchronizing signal after changing, the frequency of the modulation signal after change is 1/10 ~ 1/2 times of relaxation time inverse, and the frequency of the synchronizing signal after change is identical with the frequency of the modulation signal after change.
Preferably, the frequency of the modulation signal after change can be 1/5 times or 1/10 times of relaxation time inverse.In actual applications, when the frequency of the modulation signal after changing can be 1/5 times of relaxation time inverse, the frequency of corresponding modulation signal is 79Hz, when the frequency of the modulation signal after changing can be the relaxation time of 1/10 times of relaxation time inverse, the frequency of corresponding modulation signal is 137Hz.Usually, the value excursion in relaxation time is approximately 5mS ~ 30mS.
Step 505: according to the modulation signal after change, obtain new quantum frequency discrimination signal.
Step 506: the quantum frequency discrimination signal new according to the synchronous signal acquisition after changing.
Wherein, the synchronizing signal after change is constantly exported by processor 23, acquisition module 29 based on the frequency of synchronizing signal after changing, the quantum frequency discrimination signal of constantly sampling new.
Step 507: the synchronizing signal after display changes and new quantum frequency discrimination signal, obtains showing result.
Step 508: the first user instruction obtained according to display result receiving user's input.
Step 509: regulate the phase place of the modulation signal after changing or the phase place of synchronizing signal after changing according to first user instruction, makes the labile state of new quantum frequency discrimination signal be positioned at the stable state of the synchronizing signal after change.
Step 510: the second user instruction receiving user's input, the second user instruction is inputted according to display result by user.
Step 511: according to the second user instruction, the phase shift of regulation voltage control signal, voltage control signal obtains according to synchronous phase discrimination signal.
Phase modulation frequency multiplier 252 in aforementioned means, frequency selective amplifier 222, phase sensitive amplifier 221, filter (i.e. integrator) 223 etc. all likely cause
change, and then cause the change in gain of atomic clock system, thus produce frequency drift, normally work to make atomic clock and there is maximum gain, phase shifter 27 must be added in systems in which to offset extra phase shift
in actual applications, due to phase shift
finally can the phase place of synchronizing signal in figure 3 and frequency discrimination signal change among embody, so staff (i.e. user) can show result by Signal Monitor 30, setting needs phase shift i.e. the second user instruction regulated, and to be controlled the extra phase shift in the voltage signal that exported by phase sensitive amplifier 221 of phase shifter 27 by processor 23 according to the second user instruction
offset.
It should be noted that, the frequency (such as 1/ (5* Δ t)) of the modulation signal chosen, the frequency of keying FM signal and the frequency of synchronizing signal, phase place be remain adjustable by processor 23 numeral.
The embodiment of the present invention is by obtaining the relaxation time of atomic clock, after the frequency of modulation signal export processor and the frequency of synchronizing signal are adjusted to the several times of relaxation time inverse simultaneously, obtain new quantum frequency discrimination signal, and the phase place of the modulation signal after changing or the synchronizing signal after changing is regulated according to user instruction, the labile state of quantum frequency discrimination signal (i.e. low and high level change region) is made to be positioned at the region (i.e. high level region or low level region) of the stable state of the synchronizing signal after change, be convenient to analyze sampled signal, and then improve precision of analysis, and the phase shift of voltage control signal can be changed according to user instruction, the extra phase shift that circuit in erasure signal treatment circuit and servo loop is introduced, thus the phase demodulation error effectively reduced between quantum frequency discrimination signal and synchronizing signal, and then also ensure that the accuracy of sampling analysis result.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the signal control device based on the relaxation time, described device comprises quantized system, servo loop, processor, VCXO VCXO and signal processing circuit, the output signal that described processor controls modulation signal and the described VCXO exported obtains microwave interrogation signals simultaneously after described signal processing circuit, described microwave interrogation signals generates quantum frequency discrimination signal after described quantized system, described servo loop is used for that described quantum frequency discrimination signal is carried out phase demodulation and obtains synchronous phase discrimination signal, described processor produces synchronizing signal while the described modulation signal of generation, it is characterized in that,
Described processor is also for obtaining the loop response time of described device;
According to the described loop response time, determine the relaxation time of described device;
According to the described relaxation time, the frequency of synchronizing signal described in the frequency regulating described modulation signal, modulation signal after being changed and the synchronizing signal after changing, the frequency of the modulation signal after described change is 1/10 ~ 1/2 times of described relaxation time inverse, and the frequency of the synchronizing signal after described change is identical with the frequency of the modulation signal after described change;
According to the modulation signal after described change, obtain new quantum frequency discrimination signal;
Regulate the phase place of the synchronizing signal after the phase place of the modulation signal after described change or described change according to first user instruction, make the labile state of described new quantum frequency discrimination signal be positioned at the stable state of the synchronizing signal after described change.
2. device according to claim 1, is characterized in that, described device also comprises:
Acquisition module, for quantum frequency discrimination signal new according to the synchronous signal acquisition after described change;
Signal Monitor, for showing the synchronizing signal after described change and described new quantum frequency discrimination signal, obtains showing result;
Receiver module, for receiving the described first user instruction obtained according to described display result of user's input.
3. device according to claim 1, is characterized in that, described device also comprises ring oscillator, for by anti-phase for the output signal of described servo loop rear output;
Described processor also for obtaining the cycle of described ring oscillator, and obtains the cycle of the oscillating loop that described quantized system, described servo loop, described processor and described ring oscillator are formed;
Described processor also for according to the cycle of described ring oscillator and the cycle of described oscillating loop, determines the loop response time of described device.
4. device according to claim 1, is characterized in that, is provided with phase sensitive amplifier in described servo loop, for described synchronous phase discrimination signal is converted to voltage control signal;
Described device also comprises: digital to analog converter, after described voltage control signal is converted to analog signal, exports to described VCXO.
5. device according to claim 4, it is characterized in that, described device also comprises: phase shifter, and for regulating the phase shift of described voltage control signal according to the second user instruction, described second user instruction is inputted by described receiver module according to described display result by user.
6. adopt the signal control method based on the relaxation time of the device as described in claim 1-5, it is characterized in that, described method comprises:
Obtain the loop corresponding time of described device;
According to the described loop response time, determine the relaxation time of described device;
According to the described relaxation time, regulate the frequency of the frequency of described modulation signal and described synchronizing signal, modulation signal after being changed and the synchronizing signal after changing, the frequency of the modulation signal after described change is 1/10 ~ 1/2 times of described relaxation time inverse, and the frequency of the synchronizing signal after described change is identical with the frequency of the modulation signal after described change;
According to the modulation signal after described change, obtain new quantum frequency discrimination signal;
Regulate the phase place of the synchronizing signal after the phase place of the modulation signal after described change or described change according to first user instruction, make the labile state of described new quantum frequency discrimination signal be positioned at the stable state of the synchronizing signal after described change.
7. method according to claim 6, is characterized in that, described method comprises:
Quantum frequency discrimination signal new according to the synchronous signal acquisition after described change;
Show the synchronizing signal after described change and described new quantum frequency discrimination signal, obtain showing result;
Receive the described first user instruction obtained according to described display result of user's input.
8. method according to claim 6, is characterized in that, the loop corresponding time of the described device of described acquisition, comprising:
Obtain the cycle of ring oscillator and the cycle of oscillating loop;
According to the cycle of described ring oscillator and the cycle of described oscillating loop, determine the loop response time of described device.
9. method according to claim 6, is characterized in that, described method also comprises:
Receive the second user instruction of user's input, described second user instruction is inputted according to described display result by user;
According to described second user instruction, the phase shift of regulation voltage control signal, described voltage control signal obtains according to synchronous phase discrimination signal.
10. method according to claim 6, is characterized in that, the frequency of described modulation signal is 1/5 times or 1/10 times of described relaxation time inverse.
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