CN101241351A - Effective parameter group selection method and apparatus for phase offset regulation - Google Patents
Effective parameter group selection method and apparatus for phase offset regulation Download PDFInfo
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Abstract
The invention relates to a valid parameter group selection method and apparatus for phase offset adjustment. The invented method comprising following steps: setting up a plurality of parameter groups for adjusting PI controller; setting a threshold value for parameters of each parameter group; judging whether the threshold value in the current valid parameter group is exceeded or not, if yes, selecting another parameter group from the a plurality of parameter groups as the adjusting valid parameter group. The invented method is used to implement quick synchronization from start to be set up, and excellent shaking inhibition and smooth base clock frequency are provided.
Description
Technical field
The present invention relates to the technology of phase offset adjustments, it is particularly related to the phase offset adjustments technology that adopts proportional integral (PI) controller, is a kind of effective parameter group selection method and device that is used for phase offset adjustments concretely.
Background technology
In the phase offset adjustments process, the PI controller is as the core of phase offset adjustments, usually adopt the Several Parameters group to come the excute phase offset adjusted, rely on the mean value of phase deviation specifically and come the excute phase offset adjusted from the output valve of antialiasing wave filter reduction sampling rate.
As everyone knows, when the structure and parameter of controlled device can not be on top of, or when can not get precise math model, and other technology of control theory is when being difficult to adopt, the structure and parameter of system controller must determine that it is comparatively convenient at this moment to use the PI control technology according to experience and field adjustable.Wherein, proportional control is the simplest a kind of control mode.The output of its controller and the proportional relation of error originated from input signal.There is steady-state error in system's output when proportional control only.And in integration control, the output of controller and error originated from input signal be integrated into proportional relation.To an automatic control system, if after entering stable state, there is steady-state error, then claim this control system be steady-state error arranged or be called for short poor system arranged.In order to eliminate steady-state error, in controller, must introduce " integral ".Integral depends on the integration of time to error, and along with the increase of time, integral can increase.Like this, even if error is very little, integral also can strengthen along with the increase of time, and the output increase that it promotes controller further reduces steady-state error, up to equalling zero.Therefore, proportional+integral (PI) controller can make system not have steady-state error after entering stable state.
In the phase offset adjustments process of prior art, the execution of PI controller has fixing parameter group usually, and does not need the selection of parameter group.Facts have proved does not thisly need phase offset adjustments that parameter group is selected, the preset parameter group to have defective rapid and stable reaching on the synchronous problem.
Summary of the invention
The object of the present invention is to provide a kind of effective parameter group selection method and device that is used for phase offset adjustments, reach synchronous in order to rapid and stable in the phase offset adjustments process.
Technical scheme of the present invention is: a kind of effective parameter group selection method that is used for phase offset adjustments, and this method may further comprise the steps: set up a plurality of parameter group that are used for phase offset adjustments for pi controller; Be threshold value of the parameter setting in each parameter group; From described a plurality of parameter group, select the actual parameter group of a parameter group as phase offset adjustments; Judge whether the parameter in the current actual parameter group surpasses corresponding threshold, if then from described a plurality of parameter group, select the actual parameter group of another parameter group as phase offset adjustments.
Parameter in the described parameter group comprises: phase deviation and frequency drift; For described phase deviation and frequency drift are respectively set a threshold value; If any one in current phase deviation and the frequency drift during greater than corresponding threshold, then selected the actual parameter group of a very fast parameter group as phase offset adjustments from described a plurality of parameter group, and changes to described very fast parameter group from the parameter current group.
If current phase deviation and frequency drift are during all less than corresponding threshold, then from described a plurality of parameter group, select the actual parameter group of slow parameter group adjacent, and after predetermined time delay, change to slow parameter group from the parameter current group as phase offset adjustments with current actual parameter group.
The transport function of described pi controller is:
Wherein, P is proportional gain, and I is an integration constant; The execution of described pi controller comprises the differential equation that is used for proportional parts:
And the differential equation that is used for integral part:
T
RThe sampling time that representative is regulated; Total output valve u (k) of described pi controller is: u (k)=u
P(k)+u
I(k).
Describedly set up a plurality of parameter group be used for phase offset adjustments for pi controller and be meant: set up 5 parameter group that are used for phase offset adjustments for pi controller; The parameter of each parameter group comprises: offset frequency, maximum noise gain, proportional gain, integral part, adjusting sampling time, phase deviation, frequency drift and conversion delaing time; Each parameter value of described 5 parameter group is:
Parameter group 1: offset frequency=12mHz, maximum noise gain=0.7dB, proportional gain=6.732E-2, integral part=5.493E-4, regulate sampling time=1s, phase deviation greater than 1200ns, frequency drift greater than 3.0ppb per minute, conversion delaing time=60s;
Parameter group 2: offset frequency=6mHz, maximum noise gain=0.6dB, proportional gain=3.427E-2, integral part=1.182E-4, adjusting sampling time=4s, phase deviation≤1200ns, frequency drift≤3.0ppb per minute, conversion delaing time=90s;
Parameter group 3: offset frequency=2.4mHz, maximum noise gain=0.5dB, proportional gain=1.395E-2, integral part=1.579E-5, adjusting sampling time=10s, phase deviation≤700ns, frequency drift≤0.3ppb per minute, conversion delaing time=135s;
Parameter group 4: offset frequency=1mHz, maximum noise gain=0.3dB, proportional gain=6.013E-3, integral part=1.627E-6, adjusting sampling time=20s, phase deviation≤260ns, frequency drift≤0.2ppb per minute, conversion delaing time=200s;
Parameter group 5: offset frequency=0.4mHz, maximum noise gain=0.2dB, proportional gain=2.443E-3, integral part=1.705E-7, adjusting sampling time=30s, phase deviation≤130ns, frequency drift≤0.1ppb per minute, conversion delaing time are greater than 200s;
Wherein, the threshold value of phase deviation and the threshold value of frequency drift are respectively in each parameter group:
Parameter group 1: the threshold value of phase deviation is that the value greater than 1200ns, the threshold value of frequency drift are the value greater than the 3.0ppb per minute;
Parameter group 2: the threshold value of phase deviation is that the threshold value of 1200ns, frequency drift is the 3.0ppb per minute;
Parameter group 3: the threshold value of phase deviation is that the threshold value of 700ns, frequency drift is the 0.3ppb per minute;
Parameter group 4: the threshold value of phase deviation is that the threshold value of 260ns, frequency drift is the 0.2ppb per minute;
Parameter group 5: the threshold value of phase deviation is that the threshold value of 130ns, frequency drift is the 0.1ppb per minute.
The present invention also provides a kind of phase offset adjustments device, comprising: pi controller; The parameter group storage unit is used for storing the threshold value of a plurality of phase offset adjustments parameter group and described parameter group parameter; Actual parameter group selection unit, be used for selecting the actual parameter group of a parameter group as phase offset adjustments from a plurality of parameter group of storage, and judge whether the parameter in the current actual parameter group surpasses corresponding threshold, if, then from a plurality of parameter group, select the actual parameter group of another parameter group, and data are regulated in output as phase offset adjustments; Sampling unit is used to the phase-shift signal accepting to import, and described phase-shift signal is sampled the output sampled signal according to the sampling time of described actual parameter group selection unit output; Described pi controller receives described sampled signal and described adjusting data, and according to described adjusting data to described sampled signal excute phase offset adjusted.
Beneficial effect of the present invention is, by a kind of effective parameter group selection method and device that is used for phase offset adjustments is provided, reaches synchronous in order to rapid and stable in the phase offset adjustments process.
Description of drawings
Fig. 1 for actual parameter group of the present invention by slow parameter group to very fast parameter group flow path switch figure;
Fig. 2 for actual parameter group of the present invention by very fast parameter group to slow parameter group flow path switch figure;
Fig. 3 is the concrete structured flowcharts of implementing of apparatus of the present invention;
Fig. 4 is the curve map of changing between the parameter group that is used to regulate.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.The invention provides a kind of effective parameter group selection method that is used for phase offset adjustments, it may further comprise the steps: set up a plurality of parameter group that are used for phase offset adjustments for pi controller; Be threshold value of the parameter setting in each parameter group; From described a plurality of parameter group, select the actual parameter group of a parameter group as phase offset adjustments; Judge whether the parameter in the current actual parameter group surpasses corresponding threshold, if then from described a plurality of parameter group, select the actual parameter group of another parameter group as phase offset adjustments.
Set up 5 parameter group that are used for phase offset adjustments for pi controller; The parameter of each parameter group comprises: offset frequency, maximum noise gain, proportional gain, integral part, adjusting sampling time, phase deviation, frequency drift and conversion delaing time; Each parameter value of described 5 parameter group is:
Parameter group 1: offset frequency=12mHz, maximum noise gain=0.7dB, proportional gain=6.732E-2, integral part=5.493E-4, regulate sampling time=1s, phase deviation greater than 1200ns, frequency drift greater than 3.0ppb per minute, conversion delaing time=60s;
Parameter group 2: offset frequency=6mHz, maximum noise gain=0.6dB, proportional gain=3.427E-2, integral part=1.182E-4, adjusting sampling time=4s, phase deviation≤1200ns, frequency drift≤3.0ppb per minute, conversion delaing time=90s;
Parameter group 3: offset frequency=2.4mHz, maximum noise gain=0.5dB, proportional gain=1.395E-2, integral part=1.579E-5, adjusting sampling time=10s, phase deviation≤700ns, frequency drift≤0.3ppb per minute, conversion delaing time=135s;
Parameter group 4: offset frequency=1mHz, maximum noise gain=0.3dB, proportional gain=6.013E-3, integral part=1.627E-6, adjusting sampling time=20s, phase deviation≤260ns, frequency drift≤0.2ppb per minute, conversion delaing time=200s;
Parameter group 5: offset frequency=0.4mHz, maximum noise gain=0.2dB, proportional gain=2.443E-3, integral part=1.705E-7, adjusting sampling time=30s, phase deviation≤130ns, frequency drift≤0.1ppb per minute, conversion delaing time are greater than 200s;
Wherein, the threshold value of phase deviation and the threshold value of frequency drift are respectively in each parameter group:
Parameter group 1: the threshold value of phase deviation is that the value greater than 1200ns, the threshold value of frequency drift are the value greater than the 3.0ppb per minute;
Parameter group 2: the threshold value of phase deviation is that the threshold value of 1200ns, frequency drift is the 3.0ppb per minute;
Parameter group 3: the threshold value of phase deviation is that the threshold value of 700ns, frequency drift is the 0.3ppb per minute;
Parameter group 4: the threshold value of phase deviation is that the threshold value of 260ns, frequency drift is the 0.2ppb per minute;
Parameter group 5: the threshold value of phase deviation is that the threshold value of 130ns, frequency drift is the 0.1ppb per minute.
The threshold value of all above-mentioned parameters all obtains by the test to true environment.The fastest group be used to from start to foundation fast as far as possible synchronously.This group also can be used to handle vigour joint condition (for example, bad vibrational stabilization).Slower parameter group demonstrates preferably jitter suppression and causes more level and smooth basic clock frequency.
For 5 parameter group that are used to regulate that the PI controller is set up as shown in table 1:
Table 1
| | Group | 1 | Group 2 | Group 3 | Group 4 | Group 5 |
| Offset frequency (Cut-off frequency) (ω g) | 12mHz | 6mHz | 2.4mHz | 1mHz | 0.4mHz | |
| Maximum noise gain (Max.noise gain) (δ) | 0.7dB | 0.6dB | 0.5dB | 0.3dB | 0.2dB | |
| Proportional gain (Proportional gain) (P value) | 6.732E-2 | 3.427E-2 | 1.395E-2 | 6.013E-3 | 2.443E-3 | |
| Integral part (Integral component) (I value) | 5.493E-4 | 1.182E-4 | 1.579E-5 | 1.627E-6 | 1.705E-7 | |
| Regulate sampling time (Regulation sampling time) (T R) | 1s | 4s | 10s | 20s | 30s | |
| Phase deviation (Absolute phase deviation) | - | ≤1200ns | ≤700ns | ≤260ns | ≤130ns | |
| Frequency drift (Absolute frequency drift) | - | ≤ 3.0ppb per minute | ≤ 0.3ppb per minute | ≤ 0.2ppb per minute | ≤ 0.1ppb per minute | |
| Conversion delaing time (Switch delay time) | 60s | 90s | 135s | 200s | - |
Be current actual parameter group if organize 3, then carry out the selection step of following actual parameter group:
As shown in Figure 1, if current phase deviation
Greater than the 0.3ppb per minute, then from described 5 parameter group, select a very fast parameter group greater than 700ns or frequency drift (f), for example organize 2 or organize 1 as the actual parameter group of regulating, and immediately to described very fast parameter group conversion.
Concrete selection group 2 is still organized 1 and is needed to decide according to the size of the value of current phase deviation and current frequency drift.If current phase deviation greater than 700ns and less than 1200ns or current frequency drift greater than the 0.3ppb per minute and less than the 3.0ppb per minute then selection group 2, and immediately from organizing 3 to group 2 conversions.If current phase deviation greater than 1200ns or current frequency drift greater than the 0.3ppb per minute then directly selection group 1, and immediately from organizing 3 to group 1 conversion.
As shown in Figure 2, if current phase deviation less than 700ns and frequency drift less than the 0.3ppb per minute, then from described 5 parameter group, select slow parameter group (that is: group 4) adjacent as the actual parameter group of regulating, before the conversion of slow parameter group (group 4), need through predetermined time delay (135s) in very fast parameter group (group 3) with described current actual parameter group.Here, group 3 can only be transformed into group 4 and can not directly be transformed into group 5 to slow parameter group conversion the time, although the value of the value of current phase deviation and frequency drift has all fallen into the parameter area of group 5.
Fig. 3 is the structured flowchart of apparatus of the present invention, and phase offset adjustments device wherein comprises: the PI controller; Also comprise:
The parameter group storage unit is used for storing 5 the phase offset adjustments parameter group as shown in table 1 and the phase deviation threshold value and the frequency drift threshold value of described 5 parameter group;
Actual parameter group selection unit is used for the receiving phase skew
Signal, and from 5 parameter group of parameter group cell stores selection group 3 as the actual parameter group of phase offset adjustments, and judge whether the parameter in the current actual parameter group group 3 surpasses corresponding threshold, if, then from a plurality of parameter group, select the actual parameter group of another parameter group, and data are regulated in output as phase offset adjustments;
Sampling unit is realized by back mixing wave filter and sampling thief, is used to the phase-shift signal of accepting to import
And described phase-shift signal is sampled the output sampled signal according to the sampling time of described actual parameter group selection unit output;
Described pi controller receives described sampled signal and described adjusting data, and according to described adjusting data to described sampled signal excute phase offset adjusted.
And voltage controlled oscillator (VCO) linearizer that connects the PI controller output end, overregulate the approximate unit of limiting unit and digital-to-analog conversion (DAC) value.
Above-mentioned PI controller meets the following conditions:
The transport function K of PI controller (s) sets up as follows
In formula (1), P is proportional gain, and I is the integrator of constant PI controller.The execution of this PI controller has two differential equation, that is:
Formula (2) is the differential equation of proportional parts, and formula (3) is the differential equation of integral part.Coefficient T in the formula (3)
RThe sampling time that representative is regulated.
Total output valve u (k) of PI controller plc is calculated as follows:
u(k)＝u
P(k)+u
I(k) (4)
The parameter group of PI controller is summarized in the above-mentioned table 1, wherein: if phase deviation threshold value and frequency shift (FS) threshold value are exceeded, next quick adjustment group is used.Change parameter group for fear of frequent is suppressed from the parameter group of changing near slow-speed, expires up to conversion delaing time.
When the selection of above-mentioned actual parameter group, at first according to current (definitely) phase deviation and voltage controlled crystal oscillator (OC-VCXO, not shown in the figures) current (definitely) frequency drift initial actual parameter group of coming given PI controller, and for any one PI controller parameter group n, its phase deviation threshold value and frequency drift threshold value are also simultaneously given.If one of phase deviation threshold value or frequency drift threshold value are transfinited, then be transformed into next one parameter group faster rapidly.If when the phase deviation threshold value of parameter group and frequency drift threshold value at a time oppositely transfinite simultaneously, then be transformed into slower parameter group.Need through a time delay carrying out before slow conversion, this temporal delay mainly is an inversion frequency of avoiding high, increase referring to phase threshold shown in Figure 4 transfinites and to build governing speed, oppositely transfinite and through time delay in the process that reduces governing speed.
In Fig. 4, current phase deviation is effective mean value of phase deviation, and this comes from the output of back mixing wave filter and sampler module.
The measurements and calculations of oscilator drift are similar to by calculating one minute by a definite date average adjusted output valve of PI controller covering.The difference of two continuous average frequency values is represented oscilator drift.
The phase deviation threshold value, can find out from parameter group table (table 1) time delay on frequency drift threshold value and parameter group conversion institute edge.
The PI controller is carried out with the Several Parameters group.The threshold value of all parameter group obtains by the test to true environment.The fastest parameter group be used to from start to foundation fast as far as possible synchronously.This group also can be used to handle vigour joint condition (for example, bad vibrational stabilization).Slower parameter group demonstrates preferably jitter suppression and causes more level and smooth basic clock frequency.
Above embodiment only is used to illustrate the present invention, and non-limiting the present invention.
Claims (9)
1. effective parameter group selection method that is used for phase offset adjustments is characterized in that:
Set up a plurality of parameter group that are used for phase offset adjustments for pi controller;
Be threshold value of the parameter setting in each parameter group;
From described a plurality of parameter group, select the actual parameter group of a parameter group as phase offset adjustments;
Judge whether the parameter in the current actual parameter group surpasses corresponding threshold, if then from described a plurality of parameter group, select the actual parameter group of another parameter group as phase offset adjustments.
2. method according to claim 1 is characterized in that, the parameter in the described parameter group comprises: phase deviation and frequency drift;
For described phase deviation and frequency drift are respectively set a threshold value;
If any one in current phase deviation and the frequency drift during greater than corresponding threshold, then selected the actual parameter group of a very fast parameter group as phase offset adjustments from described a plurality of parameter group, and changes to described very fast parameter group from the parameter current group.
3. method according to claim 2 is characterized in that,
If current phase deviation and frequency drift are during all less than corresponding threshold, then from described a plurality of parameter group, select the actual parameter group of slow parameter group adjacent, and after predetermined time delay, change to slow parameter group from the parameter current group as phase offset adjustments with current actual parameter group.
4. according to any described method of claim 1 to 3, it is characterized in that,
The transport function of described pi controller is:
Wherein, P is proportional gain, and I is an integration constant;
The execution of described pi controller comprises the differential equation that is used for proportional parts:
And the differential equation that is used for integral part:
T
RThe sampling time that representative is regulated;
Total output valve u (k) of described pi controller is: u (k)=u
P(k)+u
I(k).
5. according to claim 1 or 4 described methods, it is characterized in that, describedly set up a plurality of parameter group be used for phase offset adjustments for pi controller and be meant:
Set up 5 parameter group that are used for phase offset adjustments for pi controller;
The parameter of each parameter group comprises: offset frequency, maximum noise gain, proportional gain, integral part, adjusting sampling time, phase deviation, frequency drift and conversion delaing time;
Each parameter value of described 5 parameter group is:
Parameter group 1: offset frequency=12mHz, maximum noise gain=0.7dB, proportional gain=6.732E-2, integral part=5.493E-4, regulate sampling time=1s, phase deviation greater than 1200ns, frequency drift greater than 3.0ppb per minute, conversion delaing time=60s;
Parameter group 2: offset frequency=6mHz, maximum noise gain=0.6dB, proportional gain=3.427E-2, integral part=1.182E-4, adjusting sampling time=4s, phase deviation≤1200ns, frequency drift≤3.0ppb per minute, conversion delaing time=90s;
Parameter group 3: offset frequency=2.4mHz, maximum noise gain=0.5dB, proportional gain=1.395E-2, integral part=1.579E-5, adjusting sampling time=10s, phase deviation≤700ns, frequency drift≤0.3ppb per minute, conversion delaing time=135s;
Parameter group 4: offset frequency=1mHz, maximum noise gain=0.3dB, proportional gain=6.013E-3, integral part=1.627E-6, adjusting sampling time=20s, phase deviation≤260ns, frequency drift≤0.2ppb per minute, conversion delaing time=200s;
Parameter group 5: offset frequency=0.4mHz, maximum noise gain=0.2dB, proportional gain=2.443E-3, integral part=1.705E-7, adjusting sampling time=30s, phase deviation≤130ns, frequency drift≤0.1ppb per minute, conversion delaing time are greater than 200s;
Wherein, the threshold value of phase deviation and the threshold value of frequency drift are respectively in each parameter group:
Parameter group 1: the threshold value of phase deviation is that the value greater than 1200ns, the threshold value of frequency drift are the value greater than the 3.0ppb per minute;
Parameter group 2: the threshold value of phase deviation is that the threshold value of 1200ns, frequency drift is the 3.0ppb per minute;
Parameter group 3: the threshold value of phase deviation is that the threshold value of 700ns, frequency drift is the 0.3ppb per minute;
Parameter group 4: the threshold value of phase deviation is that the threshold value of 260ns, frequency drift is the 0.2ppb per minute;
Parameter group 5: the threshold value of phase deviation is that the threshold value of 130ns, frequency drift is the 0.1ppb per minute.
6. a phase offset adjustments device comprises: pi controller; It is characterized in that also comprising:
The parameter group storage unit is used for storing the threshold value of a plurality of phase offset adjustments parameter group and described parameter group parameter;
Actual parameter group selection unit, be used for selecting the actual parameter group of a parameter group as phase offset adjustments from a plurality of parameter group of storage, and judge whether the parameter in the current actual parameter group surpasses corresponding threshold, if, then from described a plurality of parameter group, select the actual parameter group of another parameter group, and data are regulated in output as phase offset adjustments;
Sampling unit is used to the phase-shift signal accepting to import, and described phase-shift signal is sampled the output sampled signal according to the sampling time of described actual parameter group selection unit output;
Described pi controller receives described sampled signal and described adjusting data, and according to described adjusting data to described sampled signal excute phase offset adjusted.
7. device according to claim 6 is characterized in that, the parameter in the described actual parameter group comprises at least: phase deviation, frequency drift and sampling time, and described phase deviation and described frequency drift have a threshold value respectively;
Described actual parameter group selection unit, be used for judging that whether current phase deviation or frequency drift are greater than current actual parameter group corresponding threshold, if then from described a plurality of parameter group, select a very fast parameter group as the actual parameter group of regulating, and to described very fast parameter group conversion, output comprises the adjusting data in phase deviation, frequency drift and sampling time.
8. device according to claim 7 is characterized in that, the parameter in the described actual parameter group also comprises: conversion delaing time;
Described actual parameter group selection unit, be used for judging that whether current phase deviation and frequency drift are all less than current actual parameter group corresponding threshold, if, then from described a plurality of parameter group, select slow parameter group adjacent as the actual parameter group of regulating with described current actual parameter group, and after described time delay, change to slow parameter group from the parameter current group, output comprises the adjusting data in phase deviation, frequency drift and sampling time.
9. device according to claim 6, it is characterized in that, parameter in the described actual parameter group comprises: phase deviation, frequency drift, sampling time and conversion delaing time, and described phase deviation and described frequency drift have a threshold value respectively;
Described actual parameter group selection unit, judge that whether current phase deviation or frequency drift are greater than corresponding threshold in the current actual parameter group, if then from described a plurality of parameter group, select a very fast parameter group, immediately to described very fast parameter group conversion as the actual parameter group of regulating; If not, judge that then whether current phase deviation and frequency drift are all less than corresponding threshold in the current actual parameter group, if, then from described a plurality of parameter group, select slow parameter group adjacent as the actual parameter group of regulating, and after described time delay, change to slow parameter group from the parameter current group with described current actual parameter group;
Output comprises the adjusting data in phase deviation, frequency drift and sampling time.
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