CN112068057B - Self-adaptive calibration compensation method for accurate power display - Google Patents
Self-adaptive calibration compensation method for accurate power display Download PDFInfo
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Abstract
The invention discloses a self-adaptive calibration compensation method for accurate power display, and belongs to the field of high-power measurement. The method of the invention breaks through the problems of no frequency following, poor display precision, complicated operation process and the like existing in the traditional compensation method, and meets the requirements of accurate power output of a high-power test system, a microwave millimeter wave communication system, an electromagnetic compatibility test system and the like by utilizing the calibration compensation method; the amplitude response of the filter under different frequencies is utilized to realize the self-adaptive calibration of the frequency, the purpose of frequency following is achieved, the signal frequency of the input module is mastered in real time, the frequency of the display module is automatically adjusted to be consistent with that of the input module, and the input module, the output module and the display module are promoted to be synchronous in frequency; and calibrating and compensating each power point on each frequency point of the solid-state power amplifier one by one, so that the full coverage of the power points in the whole working frequency band of the solid-state power amplifier is realized, and finally, an accurate power display function is obtained.
Description
Technical Field
The invention belongs to the field of high-power measurement, and particularly relates to a self-adaptive calibration compensation method for accurate power display.
Background
The power display function of the conventional solid-state power amplifier is mainly completed by the detection module. The output power of the solid-state power amplifier passes through the coupler, the coupling end is connected with the detector for output power detection, the detected power value is converted into a direct-current voltage signal, and the display module displays the value of the output power of the power amplifier according to the direct-current voltage signal of the detector. However, since the detection power of the detector and the output voltage are in a linear relationship with low accuracy, data compensation is performed on the output power of the solid-state power amplifier when the output power of the solid-state power amplifier is required to be accurately displayed.
The traditional power display calibration compensation technology is to perform data calibration compensation on a certain power point under the condition of a certain frequency, and perform power display on the rest points according to the linear relation of the detector. However, the power amplifier is often used at different frequencies and different powers, and besides the compensated power point, it is still difficult to achieve precise power display function at other points. To achieve accurate display of power, calibration compensation of data is required for each power point. In the using process of the solid-state power amplifier, on the basis of no frequency identification, the solid-state power amplifier cannot intelligently identify the frequency of an input signal, cannot be adjusted to a frequency point which is the same as the input signal in a self-adaptive manner, and a display module is difficult to accurately adjust power calibration compensation data on a corresponding frequency point, so that data display deviation is caused. Only by adjusting the frequency of the solid-state power amplifier and adjusting the display module of the power amplifier to the same frequency point as the input module and the output module, the calibration compensation data can be correctly adjusted, and the accurate power display function is realized. The operation is complicated, and the precision, the intelligence and the simplicity of the power amplifier are reduced.
The microwave millimeter wave solid-state power amplifier is an important component in a radio communication system, is widely applied to various fields such as communication, radar, EMC test and the like, and has become an important direction for the research in the field of microwave millimeter waves. In order to meet the requirements of accurate power output of a high-power test system, a microwave millimeter wave communication system, an electromagnetic compatibility test system and the like, the solid-state power amplifier is required to have a high-accuracy power display function, the output condition of the solid-state power amplifier can be mastered in real time through accurate power display, and the high-power test system can be conveniently and quickly adjusted to the required power value.
The power display function of the solid-state power amplifier is realized as shown in fig. 1, the output power of the solid-state power amplifier is detected by a power detector in a detection module, the detected output power of the solid-state power amplifier is converted into a direct-current voltage signal, the direct-current voltage signal is converted into a digital signal through analog-to-digital conversion and data processing, and finally the power display of the solid-state power amplifier is performed by a display module.
The solid-state power amplifier power display function is mainly realized by a detection module and a display module, wherein a key device is an output power detector, the output power monitored by the detector is converted into a voltage value corresponding to the detector after passing through the detector, the relationship between the output power and the voltage value satisfies the relationship shown in figure 2, and the detection power and the output voltage are in a linear function relationship.
However, because the detection power of the detector and the output voltage are in a linear relation with low precision, after the output voltage of the detector is subjected to a series of data processing, a certain error exists in comparison with the detected output power of the solid-state power amplifier. To accurately display the output power of the solid-state power amplifier, data calibration compensation is performed on the linear relationship of the detector. The traditional data compensation is to calibrate and compensate the power value at a certain frequency point of the detector, and other power points display the output power by means of the linear relation of the detector.
The power display precision of the existing solid-state power amplifier is low, the coverage of all power points in the working frequency band of the solid-state power amplifier cannot be realized, and the accurate power display function of the solid-state power amplifier cannot be realized only by the linear relation between the detection power and the output voltage of the detector. The solid-state power amplifier cannot meet the requirement of accurate power display in a large-power test system, a microwave millimeter wave communication system and an electromagnetic compatibility test system, and some errors are introduced to the test accuracy.
The frequency value of an input signal can not be intelligently identified in the using process of the existing solid-state power amplifier, the frequency can only be manually adjusted, the frequency of the display module is adjusted to be the same as the frequency of the input signal, the synchronization of the frequency of the display module and the frequency of the input signal is realized, and the operation is complicated.
Finally, in order to improve the power display precision of the solid-state power amplifier, the full coverage of calibration compensation of all power points in the working frequency band of the solid-state power amplifier is realized by using a woven power scanning technology, and the display precision of the solid-state power amplifier is greatly improved; the self-adaptive calibration method of frequency identification and frequency following of the detection module is utilized to carry out frequency self-adaptive adjustment, the frequency of the display module of the solid-state power amplifier is guaranteed to change along with the change of an input signal all the time, the calibration compensation of corresponding power on corresponding frequency points is completed, compensation data can be accurately obtained, and therefore the accurate power display function is obtained in the using process of the solid-state power amplifier. The invention simplifies the operation steps in the use process while realizing the accurate power display function of the solid-state power amplifier, realizes the intellectualization, the simplification and the precision of the instrument, and greatly promotes the development of the solid-state power amplifier.
The self-adaptive calibration compensation method provided by the invention is used for calibrating and compensating each frequency point and each power value on the working frequency band of the solid-state power amplifier. The method comprises the steps of firstly calibrating and compensating all power points on one frequency point one by one, then adaptively adjusting the frequency point of a display module of the solid-state power amplifier to the same frequency point as an input signal when the frequency point is changed to calibrate and compensate the power points by means of a frequency identification technology, completing the calibration and compensation work, covering all power points in the working frequency band of the solid-state power amplifier in the whole adaptive calibration and compensation process, and realizing the function of accurately displaying the power of the solid-state power amplifier.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a self-adaptive calibration compensation method for accurate power display, which solves the problem of inaccurate power display caused by low precision of a detector in a solid-state power amplifier, enables the solid-state power amplifier to identify the frequency of an input signal, performs self-adaptive frequency adjustment, ensures that the frequency is changed along with the change of the input signal all the time, completes one-to-one calibration compensation of corresponding frequency points and corresponding power and can accurately adjust compensation data, and accordingly enables the solid-state power amplifier to have the function of accurate power display in the using process; reasonable in design has overcome prior art's not enough, has good effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a self-adaptive calibration compensation method for accurate power display adopts a filter to calibrate and compensate each frequency point and each power value on the working frequency band of a solid-state power amplifier by the self-adaptive calibration compensation method; the method specifically comprises the following steps:
step 1: scanning all power points on one frequency point of the solid-state power amplifier by using a woven power scanning mode, and then scanning each frequency point in a working frequency band in sequence to complete the coverage of all power points in the working frequency band of the solid-state power amplifier;
step 2: frequency identification;
based on the correlation between the frequency and the amplitude, the filter has different responses under different frequencies, and the frequency value of the input signal at the moment is reversely deduced by combining the detected attenuation value, so that the frequency identification function of the solid-state power amplifier is realized;
and step 3: frequency-following adaptive calibration compensation;
the method comprises the following steps of performing data calibration compensation on a solid-state power amplifier by combining a frequency identification technology, adaptively adjusting the frequency of a display module and the frequency of an input module of the solid-state power amplifier, and adjusting the frequency point of the display module to the frequency point same as an input signal so as to ensure the frequency pace of the display module, the input module and the output module to be consistent; and finishing the calibration compensation work.
Preferably, the amplitude-frequency characteristic of the filter on the non-conducting frequency band is used to fit a frequency-amplitude relation curve, the frequency identification is realized by using the linear relation of the curve, the filter has different amplitudes at different frequency values,
preferably, two filters are adopted, one high-pass filter and one low-pass filter, the difference value of each frequency point of the two filters is used for representing the corresponding frequency value, and the amplitude difference value of the two filters is in a linear relation with the frequency
The invention has the following beneficial technical effects:
the method of the invention breaks through the problems of no frequency following, poor display precision, complicated operation process and the like in the traditional compensation method, and the calibration compensation method is utilized to meet the requirements of accurate power output of a high-power test system, a microwave millimeter wave communication system, an electromagnetic compatibility test system and the like. The invention realizes the self-adaptive calibration of frequency by utilizing the amplitude response of the filter under different frequencies, achieves the purpose of frequency following, controls the signal frequency of the input module in real time, automatically adjusts the frequency of the display module to be consistent with the frequency of the input module, and promotes the synchronization of the input module, the output module and the display module in frequency. The method and the device perform calibration compensation on each power point on each frequency point of the solid-state power amplifier one by one, realize full coverage of the power points in the whole working frequency band of the solid-state power amplifier, and finally obtain an accurate power display function. A brand new technical support is provided for realizing the precision and the intelligence of the solid-state power amplifier and the simplicity and convenience of the instrument operation. The method comprises the following specific steps:
(1) The power display precision is high: the invention carries out data calibration compensation on the linear relation between the detection power and the output voltage of the detector, reduces the error between the detection power and the output voltage, and ensures that the power display accuracy of the solid-state power amplifier is higher.
(2) The coverage range of the calibration compensation points is wide: according to the invention, a woven power scanning mode is utilized to carry out data calibration compensation on all power points on each frequency point of the solid-state power amplifier, so that the coverage of all power points in a full frequency band is realized, and the precision of calibration compensation is improved.
(3) Frequency identification: the frequency of the input signal is identified by using the amplitude-frequency response of the filter under different frequencies, so that the frequency identification function of the solid-state power amplifier is realized.
(4) Frequency following: after the frequency of the input signal is identified, the solid-state power amplifier is automatically adjusted to be on the same frequency point as the input signal by combining the frequency identification technology of the invention, and the display frequency of the solid-state power amplifier is kept consistent with the frequency of the input signal.
(5) The self-adaptive calibration technology comprises the following steps: the invention provides a frequency identification and frequency following technology, which is used for carrying out data calibration compensation on a solid-state power amplifier and can adaptively adjust the frequency of a display module and the frequency of an input module so as to ensure the frequency pace of the display module, the input module and the output module to be consistent, thereby improving the calibration compensation precision of the solid-state power amplifier and further improving the accuracy of power display.
(6) The applicability is wide: the method can be used for improving the display accuracy of the test and measurement instrument aiming at the solid-state power amplifier and in some instruments such as a power meter, a signal generator and the like, so that the test and measurement instrument is more intelligent and humanized. Not only is the operation simpler and more convenient, but also the precision of the instrument is greatly improved, and the device has certain universality on instruments.
Drawings
Fig. 1 is a functional block diagram of a solid state power amplifier power display.
Fig. 2 is a linear plot of detected power versus output voltage for a coaxial detector.
Fig. 3 is a schematic diagram of the amplitude-frequency characteristic of a low-pass filter.
Fig. 4 is a frequency response diagram of a low pass filter.
Fig. 5 is a schematic diagram illustrating frequency values represented by differences between low-pass filters and high-pass filters at frequency points.
Fig. 6 is a graph of the amplitude difference versus frequency for two filters.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
the invention provides a self-adaptive calibration compensation method for accurate power display, which solves the problems of low calibration compensation efficiency, poor power display accuracy, complicated use and operation process and the like of the traditional solid-state power amplifier. The self-adaptive calibration compensation method provided by the invention is mainly based on the following centralized core technology: the linear relation compensation technology of the detection power and the output voltage of the detector, the woven power point scanning technology, the frequency identification technology, the frequency following self-adaptive calibration technology and the like.
In order to realize the function of accurate power display, the solid-state power amplifier mainly detects the output of the solid-state power amplifier. The detector can convert the detected radio frequency signal into a direct current voltage signal, and the direct current voltage signal are in a linear relation with low precision, as shown in fig. 2, data calibration compensation is required to be carried out on the direct current voltage signal to improve the precision of power display. In order to improve the display accuracy of the solid-state power amplifier, the power point is covered as much as possible. The invention provides a woven-fabric type power point scanning method, which takes power points on a certain frequency point as wefts, takes all frequency points as warps, and scans the power points on the wefts along the frequency warps to complete the coverage of all power points in a working frequency band.
A conventional low pass filter, as shown in fig. 3, is conductive below F frequency and has a blocking effect above F frequency. The invention uses the amplitude-frequency characteristic of the filter on the non-conductive frequency band to fit the frequency amplitude relation curve and uses the linear relation to realize the frequency identification.
The frequency identification technology provided by the invention aims to enable the solid-state power amplifier to intelligently identify the frequency value of the input signal. The frequency identification technique is to use the detected amplitude value to reversely deduce the frequency value of the input signal at the time based on the correlation between the frequency and the amplitude. The present invention utilizes a low pass filter having different amplitudes at different frequency values as shown in fig. 4.
The present invention utilizes a one-to-one correspondence of filter frequency to amplitude, as shown in fig. 4, where the corresponding frequency is f1 at amplitude A1. The solid-state power amplifier determines the frequency value of the input signal at the moment according to the monitored amplitude value, and the function of frequency identification is realized. To reduce the error introduced by the filter, the present invention utilizes two filters, a high pass filter and a low pass filter. The difference value of the two filters at each frequency point is used for representing the corresponding frequency value, as shown in fig. 5, the amplitude difference value of the two filters and the frequency are in a linear relation, so that the frequency identification is more accurate, and the resolution is higher, as shown in fig. 6.
The self-adaptive calibration compensation method provided by the invention utilizes a woven power point scanning mode to complete the coverage of all power points in the working frequency band of the solid-state power amplifier, and then carries out self-adaptive calibration compensation. The invention identifies the frequency of the input signal in the compensation work by using the frequency identification technology, adaptively adjusts the frequency to the frequency point which is the same as the input signal through the data processing of the display module, and then carries out power display compensation on the detection power and the output voltage of the detection module, thereby realizing the function of accurate power display of the solid-state power amplifier.
Protection points of the invention:
(1) Weaving type power scanning mode: the invention provides a woven-cloth type power scanning mode, which comprises the steps of firstly scanning all power points on one frequency point of a solid-state power amplifier, and then sequentially scanning each frequency point in a working frequency band as described above to complete the coverage of all power points in the working frequency band of the solid-state power amplifier.
(2) Frequency identification technology: the invention provides a frequency identification technology, which is based on the correlation between frequency and amplitude, utilizes different responses of a filter under different frequencies, and combines detected attenuation values to reversely deduce the frequency value of an input signal at the moment, thereby realizing the function of frequency identification. The present invention is not limited to the use of filters, and all structures that use amplitude-frequency response for frequency identification are intended to fall within the scope of the appended claims.
(3) The self-adaptive calibration compensation method of frequency following comprises the following steps: the invention provides a frequency following self-adaptive calibration compensation method, which can self-adaptively adjust the frequency of a display module and an input module when carrying out data calibration compensation on a solid-state power amplifier so as to ensure the frequency pace of the display module, the input module and the output module to be consistent, improve the calibration compensation precision of the solid-state power amplifier and improve the accurate power display level of the solid-state power amplifier.
(4) The applicability is wide: the self-adaptive calibration compensation method for accurate power display provided by the invention not only aims at the solid-state power amplifier, but also can be used in some power meters, signal generators and other instruments to improve the display accuracy of the test and measurement instrument, so that the test and measurement instrument is more intelligent and humanized. The method is simple and convenient in operation, greatly improves the precision of the instrument, and has certain universality on the display function of the instrument.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (3)
1. A self-adaptive calibration compensation method for accurate power display is characterized in that: a filter is adopted to carry out calibration compensation on each frequency point and each power value on the working frequency band of the solid-state power amplifier by a self-adaptive calibration compensation method; the method specifically comprises the following steps:
step 1: scanning all power points on one frequency point of the solid-state power amplifier by using a woven power scanning mode, and then scanning each frequency point in a working frequency band in sequence to complete the coverage of all power points in the working frequency band of the solid-state power amplifier;
step 2: frequency identification;
based on the correlation between the frequency and the amplitude, the filter has different responses under different frequencies, and the frequency value of the input signal at the moment is reversely deduced by combining the detected attenuation value, so that the frequency identification function of the solid-state power amplifier is realized;
and step 3: frequency-following adaptive calibration compensation;
the method comprises the following steps of performing data calibration compensation on a solid-state power amplifier by combining a frequency identification technology, adaptively adjusting the frequency of a display module and the frequency of an input module of the solid-state power amplifier, and adjusting the frequency point of the display module to the frequency point same as an input signal so as to ensure the frequency pace of the display module, the input module and the output module to be consistent; and finishing the calibration compensation work.
2. The adaptive calibration compensation method for accurate power display according to claim 1, wherein: fitting a frequency amplitude relation curve by using the amplitude-frequency characteristic of the filter on the non-conductive frequency band, and realizing frequency identification by using the linear relation, wherein the filter has different amplitudes at different frequency values.
3. The adaptive calibration compensation method for accurate power display according to claim 1, wherein: two filters, a high-pass filter and a low-pass filter are adopted, the difference value of the two filters at each frequency point is used for representing the corresponding frequency value, and the amplitude difference value of the two filters and the frequency are in a linear relation.
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