CN109787616A - A kind of frequency signal switching system and switching method - Google Patents
A kind of frequency signal switching system and switching method Download PDFInfo
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- CN109787616A CN109787616A CN201910045123.XA CN201910045123A CN109787616A CN 109787616 A CN109787616 A CN 109787616A CN 201910045123 A CN201910045123 A CN 201910045123A CN 109787616 A CN109787616 A CN 109787616A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D30/00—Reducing energy consumption in communication networks
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Abstract
The invention discloses a kind of frequency signal switching system and switching methods, comprising: main channel frequency source, alternate channel frequency source, phase discriminator, low-pass filter, converter, D/A converter, local oscillator and MCU；Main channel frequency source and alternate channel frequency source are sequentially connected phase discriminator, low-pass filter and converter respectively；The output end of converter is connected with the input terminal of MCU, and the output end of MCU is connected with the input terminal of D/A converter, and the output end of D/A converter is connected with the input terminal of local oscillator；The output of local oscillator is divided into two-way, is used for output signal all the way, and another way is connected with the input terminal of each phase discriminator respectively again.The present invention can eliminate the influence of existing proper phase difference between each road frequency signal, make in handoff procedure that phase is not beated, signal does not interrupt, it is ensured that the stability of frequency signal.
Description
Technical field
The invention belongs to temporal frequency technical field, in particular to a kind of frequency signal switching system and switching method.
Background technique
In accurate time transmission, the fields such as aerospace, radar be synchronous, sophisticated weapons manipulation, high-speed communication and deep space exploration,
Higher requirement all is proposed to frequency signal, it is desirable that it has the characteristics that accuracy, continuity, stability and reliability.
In actual use, for the reliability and stability of frequency signal, user has generally required multiple frequency sources, in order to
Coordinated, need to introduce a kind of switching method, when a frequency source currently in use breaks down, is quickly and reliably cut
It changes on another normal frequency source.But currently, most systems still use the hard handover approach such as RF switch to realize
Signal switching, so that output signal affects the stability of signal the problems such as handoff procedure is also easy to produce burr, jump and interrupts
And continuity.
Summary of the invention
The purpose of the present invention is to provide a kind of frequency signal switching system and switching methods, to solve above-mentioned skill
Art problem.Method of the invention is opened using the soft handoff of digital error tracking and channel gating instead of traditional radio frequency
The mode for closing hard handover, can eliminate the influence of existing proper phase difference between each road frequency signal, make phase in handoff procedure
It does not beat, signal does not interrupt, it is ensured that the stability of frequency signal.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of frequency signal switching system, comprising: main channel frequency source, alternate channel frequency source, phase discriminator, low-pass filtering
Device, converter, D/A converter, local oscillator and MCU；Main channel frequency source and alternate channel frequency source are sequentially connected respectively
Phase discriminator, low-pass filter and converter；The output end of converter is connected with the input terminal of MCU, the output end of MCU
It is connected with the input terminal of D/A converter, the output end of D/A converter is connected with the voltage-controlled voltage input end of local oscillator；
The output of local oscillator is divided into two-way, is used for output signal all the way, and another way is connected with the input terminal of each phase discriminator respectively
It connects.
Further, the quantity of alternate channel frequency source is one or more, and is arranged according to pre-set priority.
Further, MCU includes:
Subtracter, for calculating phase error；
PI arithmetic element, for calculating control amount according to input signal；
Control unit, the input terminal of control unit are connected with the output end of subtracter；Control unit and PI arithmetic element
It is connected, the two is able to carry out information transmitting, and the output end of control unit is for exporting control amount.
Further, the phase jitter of the output signal of frequency source switching front and back is less than 5ps.
A kind of frequency signal switching method, comprising the following steps:
Step 1, local oscillator frequencies signal is locked on the frequency signal of main channel by digital servo-control mode；
Step 2, the phase error signal of real-time detection main channel frequency signal and local oscillator frequencies signal and standby
With the phase error signal of channel frequency signal and local oscillator frequencies signal；The bounce of phase error signal is more than default threshold
When value, then it is assumed that its corresponding channel frequency signal breaks down；
Step 3, when the failure of main channel frequency signal is not detected, step 1 and step 2 are repeated；It is main logical when detecting
When road frequency signal breaks down, the phase error signal of trouble-free alternate channel is selected to believe as the input of digital servo-control
Number, local oscillator frequencies signal is locked on alternate channel frequency signal by digital servo-control mode, completes frequency signal
Switching.
Further, step 1 specifically includes:
Step 1.1, using the phase error signal of main channel frequency signal and local oscillator frequencies signal as PI operation
The input signal of unit, PI arithmetic element calculate according to the input signal and obtain control amount；
Step 1.2, the control amount that step 1.1 obtains is exported by control unit to D/A converter, and D/A converter exports mould
The frequency and phase of quasi- voltage signal control local oscillator signals, realize that local oscillator frequencies signal is believed in main channel frequency
Locking on number.
Further, step 2 specifically includes:
Step 2.1, each channel frequency signal of preset quantity and the phase error number of local oscillator frequencies signal are acquired
According to；
Step 2.2, the average value for seeking the phase error data in each channel of acquisition respectively, obtains the locking phase in each channel
Position target value；
Step 2.3, acquisition obtains each channel real-time phase error information, by the real-time phase error information in each channel and lock
Phase error signal of the difference of phase bit target value as the channel；
Step 2.4, the phase error signal in each channel that will acquire judges the frequency in each channel compared with preset threshold
Whether signal breaks down.
A kind of multichannel frequency signal switching method, based on frequency signal switching system of the invention, switching system it is standby
It is multiple with the quantity in channel frequence source, specifically includes the following steps:
Step 1, in main channel, main channel frequency signal f0With local oscillator frequencies signal fVCOSuccessively pass through phase discriminator
And low-pass filter, obtain phase error uDerr0(t)；Phase error uDerr0(t) data AD is obtained by converter0, will
AD0The input signal of PI arithmetic element as MCU；
Step 2, PI arithmetic element is according to data AD0Calculate control amount DATA, calculation formula are as follows:
DATA=p × AD0+i×∑AD0,
In formula, ∑ AD0For AD0History cumulative data, P be number PI arithmetic element proportionality coefficient, I be number PI transport
Calculate the integral coefficient of unit；
Step 3, control amount DATA is exported to D/A converter by the control unit of MCU；
Step 4, D/A converter output control voltage signal uC (t), to local oscillator signals fVCOFrequency and phase it is real
Control is applied, so that output signal fOUTIt is locked in f0；Wherein, fOUT=fVCO；
Step 5, in each alternate channel, fVCOIt is locked in f0When, the frequency signal f of acquisition alternate channel 1,2 ... Q1、f2…fQ
With fVCOThe successively voltage signal after phase discriminator and low-pass filter, and convert it to AD1、AD2…ADQ；
Step 6, by AD1、AD2…ADQN times are acquired respectively and are averaged, respectively as the locking of alternate channel 1,2 ... Q
Phase target valueN takes the integer greater than 1；
Step 7, the collected real-time AD of converter is calculated with the subtracter in MCU1、AD2……ADQWith Difference, as each channel phase errors signal Derr1、Derr2……DerrQ；
Step 8, AD is detected by the control unit of MCU0~ADQData bounce, the AD when bounce is beyond threshold valueh, judgement
It is otherwise normal for road frequency signal failure；
Step 9, if main channel frequency signal f is not detected in control unit0It breaks down, repeats step 1 to step 8；
If the control unit detects that main channel frequency signal f0It breaks down, then judges the working condition of alternate channel signal；Control
Unit selects trouble-free alternate channel phase error signal to believe as the input of the PI arithmetic element of MCU according to predetermined order
Number, local oscillator frequencies signal is locked on the alternate channel frequency signal, completes frequency signal switching.
Further, in step 8, threshold value A Dh=10.
Further, MCU is the single-chip microcontroller with default operational capability.
Compared with prior art, the invention has the following advantages:
Multichannel frequency signal seamless handover method of the invention, on the basis of Digital Phase-Locked Loop Technology, using number
The method of error tracking and software gating realizes the seamless switching of frequency signal.First by main channel frequency signal and local oscillator
The output of input signal of the phase error signal of frequency signal as the PI arithmetic element of digital phase-locked loop, PI arithmetic element is driven
Dynamic D/A converter controls local oscillator, to realize digital servo-control；Digital phase-locked loop is completed to main channel frequency signal
After locking, using each road alternate channel signal with the phase difference of local oscillator frequencies signal as the locking phase mesh on corresponding each road
Scale value；When main channel frequency signal breaks down, control unit selects trouble-free alternate channel signal and local oscillator
Input signal of the phase error signal of frequency signal as the PI arithmetic element of digital phase-locked loop completes digital servo-control, thus
Realize the seamless switching of frequency signal.The present invention uses digital error to track not by the way of RF switch hard handover
With the soft handoff of software gating, it is poor that digital error tracking technique eliminates existing proper phase between each road frequency signal
Influence, so that handoff procedure phase is not beated, software gating soft handoff be not present hardware switch movement, make to switch
Journey frequency signal does not interrupt, and ensure that the continuity of frequency signal.
The soft handoff that the present invention is gated using digital error tracking and software, instead of traditional RF switch cut
The mode changed eliminates the influence of existing proper phase difference between each road frequency signal, phase is made in handoff procedure not beat,
Signal does not interrupt, and ensure that the stability of frequency signal, so that user be allow effectively smoothly to coordinate using more
Road frequency signal source.
By actual test, the output letter of multichannel frequency signal seamless switch-over system of the invention before and after signal switching
Number phase jitter be smaller than 5ps.
Detailed description of the invention
Fig. 1 is a kind of schematic block diagram of triple channel frequency signal switching system of the embodiment of the present invention；
Fig. 2 is a kind of schematic process flow diagram of multichannel frequency signal switching method of the embodiment of the present invention.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments, and embodiment is with technology of the invention
Implemented premised on scheme, gives detailed embodiment and specific workflow, but protection scope of the present invention is not
It is limited to following embodiments.
Referring to Fig. 1, Fig. 1 is the functional block diagram of the embodiment by taking triple channel as an example.A kind of frequency signal of the invention is cut
System is changed, includes main channel frequency source and 2 road alternate channel frequency sources, phase discriminator, low-pass filter, AD conversion in the system
Device, D/A converter, local oscillator and single-chip microcontroller.Wherein the priority orders of alternate channel frequency source are f1、f2；Single-chip microcontroller is real
The functions such as existing subtracter, PI arithmetic element and control unit.
In the present invention, main channel frequency source and alternate channel frequency source be sequentially connected respectively phase discriminator, low-pass filter and
Converter；The output end of converter is connected with the input terminal of MCU, the output end of MCU and the input terminal of D/A converter
It is connected, the output end of D/A converter is connected with the input terminal of local oscillator；The output of local oscillator is divided into two-way, and one
Road is used for output signal, and it is defeated with the phase discriminator of each alternate channel and the phase discriminator of main channel respectively that another way is further divided into the road N
Enter end to be connected, N takes natural number.As long as the selection of single-chip microcontroller meets certain operational capability, such as can choose
MSP430FE427, STM32F103RCT6 etc..
MCU includes: subtracter, for calculating phase error；PI arithmetic element, for calculating control according to input signal
Amount；The input terminal of control unit is connected with the output end of subtracter；Control unit is connected with PI arithmetic element, and the two can
Information transmitting is carried out, the output end of control unit is for exporting control amount.
The phase jitter of switching system of the invention, the output signal of frequency source switching front and back is less than 5ps.
Referring to Fig. 2, a kind of multichannel frequency signal seamless handover method of the invention, comprising the following steps:
Step 1, main channel frequency signal f0With local oscillator frequencies signal fVCOIt is straight by phase discriminator, low-pass filter
It connects to obtain phase error signal uDerr0(t)；By phase error signal uDerr0(t) the data AD obtained after converter0Make
For the input signal of the PI arithmetic element of digital phase-locked loop.
Step 2, PI arithmetic element is according to AD0Control amount DATA is calculated, calculating is shown below:
DATA=p × AD0+i×∑AD0,
In formula, ∑ AD0For AD0History cumulative data, P be number PI arithmetic element proportionality coefficient, I be number PI transport
Calculate the integral coefficient of unit.
Step 3: control unit exports control amount DATA to D/A converter.
Step 4:DA converter output control voltage signal uC (t), to local oscillator signals fVCOFrequency and phase it is real
Apply control.
So far, digital phase-locked loop completes the locking to main channel frequency signal, i.e. output signal fOUTIt is locked in f0, wherein
fOUT=fVCO。
Next, realizing the seamless switching of frequency signal using the method for digital error tracking and software gating.
Step 5:AD converter continuous collecting fVCOIt is locked in f0When, alternate channel 1,2 frequency signal f1、f2With fVCOBy
Voltage signal after phase discriminator, low-pass filter, and convert it to AD1、AD2。
Step 6:AD1、AD2Acquisition n times are simultaneously averaged, the locking phase target value as alternate channel 1,2N=10 is taken herein.
Step 7: obtaining the collected new AD of converter with subtracter1、AD2WithDifference, as each
Channel phase errors signal Derr1、Derr2。
Step 8: control unit detects AD0~AD2Data bounce, the AD when bounce is beyond threshold valueh, it is judged as road frequency
Rate signal breaks down, and is otherwise normal；AD is taken hereinh=10.
Step 9: if main channel frequency signal f is not detected in control unit0It breaks down, repeats step 1 and arrive step 8；
If the control unit detects that main channel frequency signal f0It breaks down, then judges alternate channel signal f1、f2Working condition,
PI operation of the control unit according to the trouble-free alternate channel phase error signal of predefined sequential selection as digital phase-locked loop
The input signal of unit realizes digital servo-control.
By actual test, from basic frequency signal f0It is switched to alternate channel signal f1Or f2, switch the output letter of front and back
Number phase jitter be respectively less than 5ps.
Triple channel embodiment of the invention provides a kind of seamless handover method of multichannel frequency signal.In digital phase-locked loop
On the basis of technology, the seamless switching of frequency signal is realized using the method for digital error tracking and software gating.It first will be main logical
Input of the phase error signal of road frequency signal and local oscillator frequencies signal as the PI arithmetic element of digital phase-locked loop
Signal, the output driving D/A converter of PI arithmetic element control local oscillator, to realize digital servo-control.Digital phase-locked loop
After completing to the locking of main channel frequency signal, the phase difference of each road alternate channel signal and local oscillator frequencies signal is made
For the locking phase target value on each road of correspondence.When main channel frequency signal breaks down, control unit selection is trouble-free standby
Use the phase error signal of channel signal and local oscillator frequencies signal as the input of the PI arithmetic element of digital phase-locked loop
Signal completes digital servo-control, to realize the seamless switching of frequency signal.The present invention does not use the side of RF switch hard handover
Formula, and the soft handoff of digital error tracking and software gating is used, digital error tracking technique eliminates each road frequency letter
The influence of existing proper phase difference, makes handoff procedure phase not beat between number；The soft handoff of software gating is not present
The movement of hardware switch interrupts handoff procedure frequency signal not, ensure that the continuity of frequency signal.
The soft handoff that triple channel embodiment of the invention is gated using digital error tracking and software, instead of tradition
RF switch hard handover mode, eliminate the influence of existing proper phase difference between each road frequency signal, make to switch
Phase is not beated in journey, signal does not interrupt, and ensure that the stability of frequency signal, so that user be allow effectively to put down
Quietly coordinate to use channelized frequencies signal source.By actual test, which cuts in signal
The phase jitter for the output signal for changing front and back is smaller than 5ps.
Above-described embodiment is only further described the purpose of the present invention, technical scheme and beneficial effects specific
A example, present invention is not limited to this.All any modifications made within the scope of disclosure of the invention, change equivalent replacement
Into etc., it is all included in the scope of protection of the present invention.
Claims (10)
1. a kind of frequency signal switching system characterized by comprising main channel frequency source, alternate channel frequency source, phase demodulation
Device, low-pass filter, converter, D/A converter, local oscillator and MCU；
Main channel frequency source and alternate channel frequency source are sequentially connected phase discriminator, low-pass filter and converter respectively；AD turns
The output end of parallel operation is connected with the input terminal of MCU, and the output end of MCU is connected with the input terminal of D/A converter, DA conversion
The output end of device is connected with the pressure sky voltage input end of local oscillator；The output of local oscillator is divided into two-way, uses all the way
In output signal, another way is connected with the input terminal of each phase discriminator respectively.
2. a kind of frequency signal switching system according to claim 1, which is characterized in that the quantity of alternate channel frequency source
For one or more, and arranged according to pre-set priority.
3. a kind of frequency signal switching system according to claim 1, which is characterized in that MCU includes:
Subtracter, for calculating phase error；
PI arithmetic element, for calculating control amount according to input signal；
Control unit, the input terminal of control unit are connected with the output end of subtracter；Control unit is connected with PI arithmetic element
It connects, the two is able to carry out information transmitting, and the output end of control unit is for exporting control amount.
4. a kind of frequency signal switching system according to claim 1, which is characterized in that the output of frequency source switching front and back
The phase jitter of signal is less than 5ps.
5. a kind of frequency signal switching method, which comprises the following steps:
Step 1, local oscillator frequencies signal is locked on the frequency signal of main channel by digital servo-control mode；
Step 2, the phase error signal of real-time detection main channel frequency signal and local oscillator frequencies signal and spare logical
The phase error signal of road frequency signal and local oscillator frequencies signal；The bounce of phase error signal is more than preset threshold
When, then it is assumed that its corresponding channel frequency signal breaks down；
Step 3, when the failure of main channel frequency signal is not detected, step 1 and step 2 are repeated；When detect main channel frequency
When rate signal breaks down, select the phase error signal of trouble-free alternate channel as the input signal of digital servo-control, it will
Local oscillator frequencies signal is locked on alternate channel frequency signal by digital servo-control mode, completes frequency signal switching.
6. a kind of frequency signal switching method according to claim 5, which is characterized in that step 1 specifically includes:
Step 1.1, using the phase error signal of main channel frequency signal and local oscillator frequencies signal as PI arithmetic element
Input signal, PI arithmetic element according to the input signal calculate obtain control amount；
Step 1.2, the control amount that step 1.1 obtains is exported by control unit to D/A converter, D/A converter output simulation electricity
The frequency and phase for pressing signal control local oscillator signals realize local oscillator frequencies signal on the frequency signal of main channel
Locking.
7. a kind of frequency signal switching method according to claim 5, which is characterized in that step 2 specifically includes:
Step 2.1, each channel frequency signal of preset quantity and the phase error data of local oscillator frequencies signal are acquired；
Step 2.2, the average value for seeking the phase error data in each channel of acquisition respectively, obtains the locking phase mesh in each channel
Scale value；
Step 2.3, acquisition obtains each channel real-time phase error information, by the real-time phase error information in each channel and locking phase
Phase error signal of the difference of position target value as the channel；
Step 2.4, the phase error signal in each channel that will acquire judges the frequency signal in each channel compared with preset threshold
Whether break down.
8. a kind of multichannel frequency signal switching method, which is characterized in that based on frequency signal described in claim 1 switching system
System, the quantity of the alternate channel frequency source of switching system are multiple, specifically includes the following steps:
Step 1, in main channel, main channel frequency signal f0With local oscillator frequencies signal fVCOSuccessively pass through phase discriminator and low pass
Filter obtains phase error uDerr0(t)；Phase error uDerr0(t) data AD is obtained by converter0, by AD0As
The input signal of the PI arithmetic element of MCU；
Step 2, PI arithmetic element is according to data AD0Calculate control amount DATA, calculation formula are as follows:
DATA=p × AD0+i×∑AD0,
In formula, ∑ AD0For AD0History cumulative data, P be number PI arithmetic element proportionality coefficient, I be number PI operation list
The integral coefficient of member；
Step 3, control amount DATA is exported to D/A converter by the control unit of MCU；
Step 4, D/A converter output control voltage signal uC (t), to local oscillator signals fVCOFrequency and phase implement control
System, so that output signal fOUTIt is locked in f0；Wherein, fOUT=fVCO；
Step 5, in each alternate channel, fVCOIt is locked in f0When, the frequency signal f of acquisition alternate channel 1,2 ... Q1、f2…fQWith fVCO
The successively voltage signal after phase discriminator and low-pass filter, and convert it to AD1、AD2…ADQ；
Step 6, by AD1、AD2…ADQN times are acquired respectively and are averaged, respectively as the locking phase of alternate channel 1,2 ... Q
Target valueN takes the integer greater than 1；
Step 7, the collected real-time AD of converter is calculated with the subtracter in MCU1、AD2……ADQWith Difference, as each channel phase errors signal Derr1、Derr2……DerrQ；
Step 8, AD is detected by the control unit of MCU0~ADQData bounce, the AD when bounce is beyond threshold valueh, it is judged as this
Road frequency signal breaks down, and is otherwise normal；
Step 9, if main channel frequency signal f is not detected in control unit0It breaks down, repeats step 1 to step 8；If control
Unit processed detects main channel frequency signal f0It breaks down, then judges the working condition of alternate channel signal；Control unit is pressed
It selects trouble-free alternate channel phase error signal as the input signal of the PI arithmetic element of MCU according to predetermined order, incite somebody to action this
Ground oscillator frequency signal locks on the alternate channel frequency signal, completes frequency signal switching.
9. a kind of multichannel frequency signal switching method according to claim 8, which is characterized in that in step 8, threshold value A Dh=
10。
10. a kind of multichannel frequency signal switching method according to claim 8, which is characterized in that MCU is with default operation
The single-chip microcontroller of ability.
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