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CN-121750118-B - Device for calibrating amplitude and phase

CN121750118BCN 121750118 BCN121750118 BCN 121750118BCN-121750118-B

Abstract

The application discloses an amplitude-phase calibration device which is a receiver device or a transmitter device and comprises an acquisition module, a low-frequency calibration module and a restoration module, wherein the acquisition module is used for acquiring source data output by a source data output end and obtaining sampling data based on the source data, the low-frequency calibration module is used for filtering the sampling data according to a filtering coefficient group to obtain a difference signal, the restoration module is used for outputting compensation data matched with the type of a signal to be compensated according to the difference signal, and the compensation module is used for compensating the signal to be compensated based on the compensation data to generate a target signal after the amplitude-phase calibration. By adopting the device, the high-precision low-frequency band amplitude phase calibration can be realized, so that the low-frequency band amplitude phase flatness of the system is improved, and meanwhile, the resource consumption and the demand on resources are reduced under the same calibration precision requirement, so that the flexibility is high, and the applicability is high.

Inventors

  • Cheng Jiaju
  • WANG LUTING
  • TAN JIAN
  • YANG LIN

Assignees

  • 深圳市万里眼技术有限公司

Dates

Publication Date
20260508
Application Date
20260224

Claims (13)

  1. 1. An apparatus for amplitude and phase calibration, the apparatus being a receiver apparatus or a transmitter apparatus, characterized in that: The receiver device comprises an analog front end module, an analog-to-digital conversion module, a plurality of first calibration modules, a first compensation module and one or more digital signal processing modules, wherein the analog front end module is used for outputting a first starting signal to the analog-to-digital conversion module, the analog-to-digital conversion module is used for carrying out analog-to-digital conversion on the first starting signal to obtain digital calibration signals and outputting the digital calibration signals to the plurality of first calibration modules, the plurality of first calibration modules are used for carrying out calibration processing on the digital calibration signals and outputting calibrated first processing signals to the one or more digital signal processing modules, and the one or more digital signal processing modules are used for carrying out signal processing on the first processing signals; The transmitter device comprises a signal generation module, a plurality of second calibration modules, a second compensation module, a digital-to-analog conversion module and one or more analog signal processing circuits, wherein the signal generation module is used for outputting second initial signals to the plurality of second calibration modules, the plurality of second calibration modules are used for carrying out calibration processing on the second initial signals and outputting second processing signals to the digital-to-analog conversion module, the digital-to-analog conversion module is used for carrying out digital-to-analog conversion on the second processing signals to obtain analog calibration signals and outputting the analog calibration signals to the one or more analog signal processing circuits, and the one or more analog signal processing circuits are used for carrying out signal processing on the analog calibration signals; the device also comprises an acquisition module, a low-frequency band calibration module and a restoration module; The acquisition module is used for acquiring source data output by a source data output end, acquiring sampling data based on the source data, wherein the first sampling rate of the sampling data is smaller than the second sampling rate of the source data; The low-frequency band calibration module is used for filtering the sampling data according to a filter coefficient set to obtain a difference signal, wherein the filter coefficient set comprises a plurality of filter coefficients, the filter coefficient set is used for reflecting the difference between the target amplitude phase flatness of a system and the amplitude phase flatness to be compensated, the difference signal is a signal quantity difference value between the condition of the target amplitude phase flatness and the condition of the amplitude phase flatness to be compensated, when the device is a receiver device, the signal to be compensated is any signal from the input end of the analog front end module to the output end of the one or more digital signal processing modules, and when the device is a transmitter device, the signal to be compensated is any signal from the input end of the signal generation module to the output end of the one or more analog signal processing circuits; The restoring module is used for outputting compensation data matched with the type of the signal to be compensated according to the difference signal, and the compensation data are used for being combined on the signal to be compensated so as to realize amplitude-phase calibration; the first compensation module and the second compensation module are both used for compensating the signal to be compensated based on the compensation data so as to generate a target signal after the amplitude-phase calibration.
  2. 2. The apparatus of claim 1, wherein the set of filter coefficients is a plurality of coefficients based on a first reference frequency response, a second reference frequency response, and a target frequency response, the first reference frequency response being a frequency response of an original system between a start-up end and the source data output end, the second reference frequency response being a frequency response of the original system between the start-up end and an end-up end, the target frequency response being a desired frequency response of the original system between the start-up end and the end-up end, wherein the original system is a system that is not compensated by a compensation module; when the device is a receiver device, the compensation module is the first compensation module, the starting end is any one signal end from the input end of the analog front end module to the output end of the analog-to-digital conversion module, and the ending end is any signal end except the first compensation module after the starting end; when the device is a transmitter device, the compensation module is the second compensation module, the ending end is any one signal end from the input end of the digital-to-analog conversion module to the output end of the one or more analog signal processing circuits, and the starting end is any signal end except the second compensation module before the ending end.
  3. 3. The apparatus of claim 2, wherein the set of filter coefficients is a plurality of coefficients derived based on a difference between the target frequency response and the second reference frequency response, and the first reference frequency response.
  4. 4. A device according to any one of claims 1 to 3, wherein each filter coefficient in the set of filter coefficients is a time domain filter coefficient or a frequency domain filter coefficient, and the low-band calibration module is configured to, when filtering the sampled data according to the set of filter coefficients to obtain a difference signal, specifically: and performing time domain filtering or frequency domain filtering on the sampled data according to the filtering coefficient set to obtain the difference signal.
  5. 5. A device according to any one of claims 1 to 3, wherein the first sampling rate is less than or equal to 1/2 of the second sampling rate.
  6. 6. A device according to any one of claims 1 to 3, wherein the low frequency band is less than or equal to 1/2 of the system bandwidth of the device.
  7. 7. A device according to claim 2 or 3, wherein the device is a receiver device and the source data output is any signal end in a main link other than the first compensation module, wherein the main link is composed of the analog front end module, the analog-to-digital conversion module, the plurality of first calibration modules, the first compensation module, and the one or more digital signal processing modules.
  8. 8. A device according to claim 2 or 3, wherein the device is a transmitter device and the source data output is any one of the signal terminals in the main link except for the second compensation module, wherein the main link is composed of the signal generating module, the plurality of second calibration modules, the second compensation module, the digital-to-analog conversion module, and the one or more analog signal processing circuits.
  9. 9. A device according to any one of claims 1 to 3, wherein the source data is a digital signal, and the acquisition module is configured to: And filtering and downsampling the source data to reduce the sampling rate of the source data from a second sampling rate to a first sampling rate, so as to obtain sampling data with the first sampling rate.
  10. 10. The apparatus of claim 9, wherein, in the case where the signal to be compensated is a digital signal, the restoration module is configured to: Performing direct interpolation processing on the difference signal or performing filtering interpolation processing on the difference signal to convert the sampling rate of the difference signal to a third sampling rate of the signal to be compensated so as to generate first interpolation data, wherein a low-frequency part in the first interpolation data is consistent with a low-frequency part in the difference signal, and energy of other frequency parts except the low-frequency part in the first interpolation data is restrained; and outputting the first interpolation data as compensation data.
  11. 11. The apparatus of claim 9, wherein, in the case where the signal to be compensated is an analog signal, the restoration module is configured to: Performing digital-to-analog conversion on the difference signal to obtain a first converted signal, performing synchronous calibration on the first converted signal, and outputting the synchronous calibrated signal as compensation data, or And performing direct interpolation processing on the difference signal or filtering interpolation processing on the difference signal to increase the sampling rate of the difference signal so as to generate second interpolation data, wherein the low-frequency part in the second interpolation data is consistent with the low-frequency part in the difference signal, the energy of other frequency parts except the low-frequency part in the second interpolation data is restrained, performing digital-to-analog conversion on the second interpolation data so as to obtain a second conversion signal, performing synchronous calibration on the second conversion signal, and outputting the signal after synchronous calibration as compensation data.
  12. 12. A device according to any one of claims 1 to 3, wherein the source data is an analog signal, and the acquisition module is configured to: The method comprises the steps of obtaining a digital signal corresponding to source data by carrying out low-pass filtering and analog-to-digital conversion on the source data through a low-pass filter and an analog-to-digital converter, carrying out filtering and downsampling extraction on the digital signal corresponding to the source data to reduce the sampling rate of the digital signal corresponding to the source data from a second sampling rate to a first sampling rate so as to obtain sampling data with the first sampling rate, or And performing low-pass filtering and analog-to-digital conversion on the source data through a low-pass filter and an analog-to-digital converter outputting a digital signal with a first sampling rate to obtain a digital signal corresponding to the source data as sampling data, wherein the sampling rate of the sampling data is the first sampling rate.
  13. 13. The apparatus of claim 12, wherein, in the case where the signal to be compensated is a digital signal, the restoration module is configured to: Performing direct interpolation processing on the difference signal or filtering interpolation processing on the difference signal to convert the sampling rate of the difference signal to a third sampling rate of the signal to be compensated to generate third interpolation data, wherein the low frequency part in the third interpolation data is consistent with the low frequency part in the difference signal and the energy of other frequency parts except the low frequency part in the third interpolation data is restrained, performing synchronous calibration on the third interpolation data, and outputting the data after synchronous calibration as compensation data, or And performing direct interpolation processing on the calibration signal or filtering interpolation processing on the calibration signal to convert the sampling rate of the calibration signal to the third sampling rate of the signal to be compensated so as to generate and output compensation data, wherein the low-frequency part in the compensation data is consistent with the low-frequency part in the calibration signal, and the energy of other frequency parts except the low-frequency part in the compensation data is restrained.

Description

Device for calibrating amplitude and phase Technical Field The application relates to the field of signal processing, in particular to a device for amplitude-phase calibration. Background In the field of signal processing, the amplitude and phase information of signals are the core basis for accurately characterizing the measured physical characteristics. When the system function index of the instrument is highly sensitive to the amplitude-phase characteristic, in order to ensure the fidelity of signal measurement and the metering traceability of signal generation, the amplitude-phase response of the instrument needs to be accurately calibrated. In large bandwidth systems, the amplitude-phase response of the low frequency band often requires a higher accuracy of calibration. Particularly, in the scene of high low-frequency energy or strict system recovery precision requirement, the deviation of the amplitude and phase flatness can have a significant influence on the system performance. In order to solve the above problems, the prior art generally adopts full-bandwidth high-precision amplitude phase calibration or frequency division calibration of separating high frequency bands and low frequency bands. However, if the full-bandwidth high-precision amplitude phase calibration is directly performed, the required filter order increases sharply, which results in a sharp increase in hardware resources and a rise in implementation cost. If the frequency division calibration is adopted, under the condition that the bandwidth of the low-frequency signal is low enough, the hardware and the filter are difficult to separate the high-frequency band from the low-frequency band, the ideal roll-off on the hardware is required to be difficult to realize, and the order of the filter is obviously increased due to the fact that the narrow transition band and the large roll-off rate are realized on the filter, the engineering realizability is not high, and the applicability is low. Therefore, the high precision of hardware resources and low-frequency band frequency response calibration is an urgent problem to be solved in the instrument amplitude phase calibration. Disclosure of Invention The application discloses a device for calibrating an amplitude phase, which can realize high-precision low-frequency amplitude phase calibration so as to improve the flatness of the low-frequency amplitude phase of a system, and simultaneously, reduces the resource consumption and the demand for resources under the same calibration precision requirement, and has high flexibility and high applicability. In a first aspect, the present application provides an apparatus for amplitude phase calibration, said apparatus being a receiver apparatus or a transmitter apparatus; the receiver device comprises an analog front end module, an analog-to-digital conversion module, a plurality of first calibration modules, a first compensation module and one or more digital signal processing modules, wherein the analog front end module is used for outputting a first initial signal to the analog-to-digital conversion module, the analog-to-digital conversion module is used for carrying out analog-to-digital conversion on the first initial signal to obtain a digital calibration signal and outputting the digital calibration signal to the plurality of first calibration modules, the plurality of first calibration modules are used for carrying out calibration processing on the digital calibration signal and outputting a calibrated first processing signal to the one or more digital signal processing modules, the one or more digital signal processing modules are used for carrying out signal processing on the first processing signal, the transmitter device comprises a signal generation module, a plurality of second calibration modules, a second compensation module, a digital-to-analog conversion module and one or more analog signal processing circuits, the signal generation module is used for carrying out analog-to-digital conversion on the first initial signal to obtain a digital calibration signal, the plurality of second calibration modules is used for carrying out calibration processing on the second initial signal to the second signal and outputting the digital calibration signal to the plurality of first calibration modules, the plurality of digital-to obtain a first processing signal after calibration processing signal to the digital-to the one or more digital signal processing modules, the one or more digital-to-analog signal processing modules are used for obtaining the analog signals from the analog signal processing module, the digital conversion module is used for obtaining the digital conversion signal from the calibration signal from the analog signal processing module, the analog signal processing module is used for obtaining the digital conversion module, the digital conversion module is used for obtaining the digital conversion signal from the calibrati