CN-122027432-A - Radio frequency closed loop decoupling device and method

CN122027432ACN 122027432 ACN122027432 ACN 122027432ACN-122027432-A

Abstract

The invention discloses a radio frequency closed loop decoupling device and method, wherein the device comprises a radio frequency sampling module, a preprocessing module, an extended state observation module, a decoupling control module and a radio frequency driving module, wherein the radio frequency sampling module is used for collecting radio frequency signals of a resonant cavity and converting the radio frequency signals into intermediate frequency signals, the preprocessing module is used for converting the intermediate frequency signals into I-path signals and Q-path signals, the extended state observation module is used for obtaining I-component estimated values, Q-component estimated values and corresponding generalized disturbance estimated values according to the I-path signals and the Q-path signals, the decoupling control module is used for performing proportional control according to the I-component estimated values and the Q-component estimated values, and superposing the generalized disturbance estimated values as decoupling compensation values to obtain baseband signals so as to inhibit channel coupling and external disturbance, and the radio frequency driving module is used for converting the baseband signals into driving signals so as to control the amplitude and the phase of radio frequency output by a power source. The invention realizes the dynamic decoupling of the I signal channel and the Q signal channel, and improves the stability and control precision of the output amplitude and the phase of the power source.

Inventors

DONG BOYANG
ZHANG ZHIYUAN
Ran Qiaoye
ZHU JINFU
DING HONGLI
YANG JIAYUE
ZHANG WEIQING

Assignees

深圳先进光源研究院

Dates

Publication Date: 20260512
Application Date: 20251225

Claims (10)

1. A radio frequency closed loop decoupling device comprising: The radio frequency sampling module is used for being connected with the resonant cavity, collecting radio frequency signals of the resonant cavity and converting the radio frequency signals into intermediate frequency signals; The preprocessing module is connected with the radio frequency sampling module and used for converting the intermediate frequency signal into an I path signal and a Q path signal; The extended state observation module is connected with the preprocessing module and is used for obtaining an I component estimated value, a Q component estimated value and a corresponding generalized disturbance estimated value according to the I path signal and the Q path signal; the decoupling control module is connected with the extended state observation module and is used for performing proportional control according to the I component estimated value and the Q component estimated value, and superposing the generalized disturbance estimated value as a decoupling compensation quantity to obtain a baseband signal so as to inhibit channel coupling and external disturbance; And the radio frequency driving module is connected with the decoupling control module and is used for converting the baseband signal into a driving signal so as to control the amplitude and the phase of the radio frequency output of the power source.
2. The RF closed loop decoupling device of claim 1, wherein said RF sampling module comprises a PT signal probe and a down converter; The PT signal probe part is positioned in the resonant cavity and is used for collecting radio frequency signals output by the resonant cavity; the down converter is connected with the PT signal probe and used for converting the radio frequency signal into an intermediate frequency signal.
3. The apparatus of claim 2, wherein the preprocessing module comprises an IQ demodulator and ADC unit, wherein, The ADC unit is connected with the down converter and is used for collecting intermediate frequency signals; the IQ demodulator is connected with the ADC unit and is used for converting the intermediate frequency signal into an I path signal and a Q path signal and carrying out normalization and filtering processing.
4. The RF closed loop decoupling apparatus of claim 3, wherein said RF drive module comprises an IQ modulator, a DAC unit and an up-converter, wherein, The IQ demodulator is connected with the decoupling control module and is used for modulating a baseband signal output by the decoupling control module into an intermediate frequency signal; the DAC unit is connected with the up-conversion unit and is used for converting digital quantity into analog quantity; the up-converter is connected with the power source and is used for converting the intermediate frequency signal into a radio frequency signal.
5. A radio frequency closed loop decoupling method based on a radio frequency closed loop decoupling device according to any one of claims 1-4, the method comprising the steps of: Sampling a radio frequency signal of the resonant cavity and converting the radio frequency signal into an intermediate frequency signal; Converting the intermediate frequency signal into an I path signal and a Q path signal; Obtaining an I component estimated value and a Q component estimated value according to the I path signal and the Q path signal and a corresponding generalized disturbance estimated value; Proportional control is carried out according to the I component estimated value and the Q component estimated value, and the generalized disturbance estimated value is used as a decoupling compensation quantity to be overlapped to obtain a baseband signal so as to inhibit channel coupling and external disturbance; The baseband signal is converted into a driving signal to control the amplitude and phase of the radio frequency output of the power source.
6. The method of radio frequency closed loop decoupling as claimed in claim 5, wherein said step of deriving an I component estimate and a Q component estimate and corresponding generalized disturbance estimators from said I signal and said Q signal comprises: Taking detuning, load variation and uncertain factors as generalized disturbance, and respectively establishing a model for an I-path signal channel and a Q-path signal channel; Constructing an extended state observer for the control channels of the I-channel signal and the Q-channel signal, dynamically estimating generalized disturbance in the corresponding channels, and writing the coupling item into the disturbance item; And respectively establishing extended state observers for the I-path signal channel and the Q-path signal channel, and obtaining an I component estimated value, a Q component estimated value and a corresponding generalized disturbance estimated value.
7. The method of radio frequency closed loop decoupling according to claim 6, wherein in the step of establishing extended state observers for the I-channel signal path and the Q-channel signal path respectively, the extended state observer parameters are determined simultaneously using a pole allocation method.
8. The method of radio frequency closed loop decoupling according to claim 6, wherein in the step of modeling the I-channel and the Q-channel with respect to the detuning, the loading variation, and the uncertainty as generalized disturbances, respectively, a first order linear model is used to model the I-channel and the Q-channel, respectively, The I-path signal channel model is as follows: ; The Q paths of signal channel models are as follows: ; Wherein: , input control variables for the I and Q components respectively, , As a parameter of the model, it is possible to provide, , Representing disturbance terms including detuning, load variations, transmission line reflections, and disturbances caused by amplitude-phase coupling.
9. The method of radio frequency closed loop decoupling according to claim 8, wherein in the step of dynamically estimating generalized disturbances in the corresponding channel and writing the coupling term into the disturbance term, the expression of the disturbance term is: ; Wherein, the , Representing the coupling coefficient of the coupling coefficient, , Other unknown disturbances; In the step of establishing extended state observers for the I-channel signal channel and the Q-channel signal channel respectively, the I-channel signal channel extended state observer is expressed as: ; The Q-way signal path extended state observer is expressed as: ; Wherein, the , The estimates of the I and Q components respectively, , Respectively the estimated amount of the corresponding disturbance, , , , Is an extended state observer parameter.
10. The method of claim 5, wherein in the step of proportional controlling according to the I component estimated value and the Q component estimated value and superimposing the generalized disturbance estimated value as a decoupling compensation amount to obtain a baseband signal to suppress channel coupling and external disturbance, The control variable of the I-way signal path is expressed as: ; the control variable of the Q-way signal path is expressed as: ; Wherein, the , The reference values for I and Q respectively, , Is a proportional integral coefficient.

Description

Radio frequency closed loop decoupling device and method Technical Field The invention relates to the technical field of particle accelerators, in particular to a radio frequency closed loop decoupling device and a radio frequency closed loop decoupling method. Background With the development of linear accelerators, storage rings and industrial radio frequency heating devices, a low-level radio frequency (LLRF) of a power source and a resonant cavity is an all-digital closed-loop feedback control system formed by quadrature demodulation technology based on I/Q modulation sampling, and the main function of the system is to realize stable control of the amplitude of the voltage of a superconducting cavity, stable control of the phase and stable control of the resonant frequency of the cavity, and the control system generally adopts an amplitude-phase or I/Q mode to carry out closed-loop control so as to ensure stable amplitude and phase of an output field. In actual engineering, due to the factors of resonance cavity detuning, transmission line reflection, load change, power amplifier nonlinearity and the like, dynamic coupling between an amplitude loop and a phase loop and between an I channel and a Q channel exists in a radio frequency closed loop generally, so that additional disturbance can be generated in another channel by a control action of a single channel, the controller is difficult to set, the stability margin is reduced, the noise immunity performance is insufficient, and the decoupling control robustness of the radio frequency closed loop is poor. Accordingly, the prior art is still in need of improvement and development. Disclosure of Invention In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a radio frequency closed loop decoupling device and method, so as to solve the problem of obvious dynamic coupling between an I channel and a Q channel in the existing radio frequency closed loop control. The technical scheme of the invention is as follows: In a first aspect, the present invention provides a radio frequency closed loop decoupling device comprising: the radio frequency sampling module is used for being connected with the resonant cavity, collecting radio frequency signals of the resonant cavity and converting the radio frequency signals into intermediate frequency signals; The preprocessing module is connected with the radio frequency sampling module and used for converting the intermediate frequency signal into an I path signal and a Q path signal; The extended state observation module is connected with the preprocessing module and is used for obtaining an I component estimated value, a Q component estimated value and a corresponding generalized disturbance estimated value according to the I path signal and the Q path signal; the decoupling control module is connected with the extended state observation module and is used for performing proportional control according to the I component estimated value and the Q component estimated value, and superposing the generalized disturbance estimated value as a decoupling compensation quantity to obtain a baseband signal so as to inhibit channel coupling and external disturbance; And the radio frequency driving module is connected with the decoupling control module and is used for converting the baseband signal into a driving signal so as to control the amplitude and the phase of the radio frequency output of the power source. The invention further provides the radio frequency sampling module which comprises a PT signal probe, a PT signal probe and a down converter; the PT signal probe is positioned in the resonant cavity and used for coupling radio frequency signals of the resonant cavity; The down converter is connected with the PT signal probe and is used for converting the radio frequency signal into an intermediate frequency signal. The invention further provides that the preprocessing module comprises an IQ demodulator and an ADC unit, wherein, The ADC unit is connected with the down converter and is used for collecting intermediate frequency signals; the IQ demodulator is connected with the ADC unit and is used for converting the intermediate frequency signal into an I path signal and a Q path signal and carrying out normalization and filtering processing. The invention further provides a radio frequency driving module which comprises an IQ modulator, a DAC unit and an up-converter, wherein, The IQ demodulator is connected with the decoupling control module and is used for converting a baseband signal output by the decoupling control module into an intermediate frequency signal; the DAC unit is connected with the up-conversion unit and is used for converting digital quantity into analog quantity; the up-conversion is connected with a power source and is used for converting the intermediate frequency signal into a radio frequency signal. In a second aspect, the present invention further provid