CN113960360A - Power compensation method and frequency power meter with power compensation - Google Patents
Power compensation method and frequency power meter with power compensation Download PDFInfo
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Abstract
The invention discloses a power compensation method and a frequency power meter with power compensation, comprising the following steps: step S1, acquiring the detection frequency of the frequency detection circuit, the detection temperature of the temperature sensor and the detection power of the power detection circuit; step S2, compensating the detection frequency of the frequency detection circuit and the detection power of the power detection circuit according to the detection temperature of the temperature sensor, thereby obtaining the compensation frequency and the compensation power; and step S3, calculating a compensation value for the compensation frequency according to the frequency-power curve based on the compensation frequency and the compensation power obtained in step S2, thereby obtaining a final sampling power. And compensating the detection frequency and the detection power by adopting the temperature value, and further compensating the power value according to the compensated detection frequency value and the detection power value, thereby effectively improving the detection precision of the frequency power meter and obtaining the high-precision frequency power meter.
Description
Technical Field
The present invention relates to the field of power detection technologies, and in particular, to a power compensation method and a frequency power meter with power compensation.
Background
The power meter is a common device in the detection field and is widely applied to various military and industrial fields, but with the improvement of science and technology, people have higher and higher requirements on the precision of power detection, and the attention on how to reduce the detection error of the power meter and improve the detection precision is more and more paid.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a power compensation method and a frequency power meter with power compensation are provided, which can improve the detection accuracy of the existing frequency power meter.
In order to solve the technical problems, the invention adopts the technical scheme that: a method of power compensation comprising the steps of:
step S1, acquiring the detection frequency of the frequency detection circuit, the detection temperature of the temperature sensor and the detection power of the power detection circuit in real time;
step S2, compensating the detection frequency and the detection power according to the detection temperature, thereby obtaining a compensation frequency and a compensation power;
and step S3, calculating a compensation value for the compensation power according to the compensation frequency and the frequency-power curve based on the compensation frequency and the compensation power obtained in the step S2, thereby obtaining the final sampling power.
In order to solve the technical problem, the invention adopts another technical scheme as follows: a frequency power meter with power compensation comprises a power detection circuit, a temperature compensation circuit, a frequency detection circuit, an upper computer interface and a controller, wherein the controller is electrically connected with the temperature compensation circuit, the power detection circuit, the upper computer interface and the frequency detection circuit respectively, the controller comprises a computer program which is stored on the controller and can run on the controller, and the following steps are realized when the controller executes the computer program:
step S1, acquiring the detection frequency of the frequency detection circuit, the detection temperature of the temperature sensor and the detection power of the power detection circuit in real time;
step S2, compensating the detection frequency and the detection power according to the detection temperature, thereby obtaining a compensation frequency and a compensation power;
and step S3, calculating a compensation value for the compensation power according to the compensation frequency and the frequency-power curve based on the compensation frequency and the compensation power obtained in the step S2, thereby obtaining the final sampling power.
The invention has the beneficial effects that: a power compensation method and a frequency power meter with power compensation are provided, wherein a temperature value is adopted to compensate a detection frequency and a detection power, and the power value is further compensated according to the compensated detection frequency value and the detection power value, so that the detection precision of the frequency power meter is effectively improved, and the high-precision frequency power meter is obtained.
Drawings
Fig. 1 is a schematic flow chart of a power compensation method according to an embodiment of the present invention;
fig. 2 is a schematic structural block diagram of a frequency power meter with power compensation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a detector isolation circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a signal amplifying circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a single-ended to differential circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an input switching circuit of a programmable amplifier according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an output switching circuit of a programmable amplifier according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a control circuit of the signal conditioning circuit according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a programmable amplifying circuit according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a main circuit of a high-speed sampling circuit according to an embodiment of the present invention;
FIG. 11 is a diagram of a clock generation circuit of a high-speed sampling circuit according to an embodiment of the present invention;
FIG. 12 is a diagram of a clock conversion circuit of a high-speed sampling circuit according to an embodiment of the present invention;
FIG. 13 is a schematic diagram of a differential clock generation circuit of a high-speed sampling circuit according to an embodiment of the present invention;
fig. 14 is a schematic diagram of a low frequency divider module circuit according to an embodiment of the present invention;
fig. 15 is a schematic diagram of a high-frequency division module circuit according to an embodiment of the present invention.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a power compensation method includes the steps of:
step S1, acquiring the detection frequency of the frequency detection circuit, the detection temperature of the temperature sensor and the detection power of the power detection circuit in real time;
step S2, compensating the detection frequency and the detection power according to the detection temperature, thereby obtaining a compensation frequency and a compensation power;
and step S3, calculating a compensation value for the compensation power according to the compensation frequency and the frequency-power curve based on the compensation frequency and the compensation power obtained in the step S2, thereby obtaining the final sampling power.
From the above description, the beneficial effects of the present invention are: and compensating the detection frequency and the detection power by adopting the temperature value, and further compensating the power value according to the compensated detection frequency value and the detection power value, thereby effectively improving the detection precision of the frequency power meter and obtaining the high-precision frequency power meter.
Further, the step S2 includes:
step S21, calculating a frequency compensation value based on the detection temperature according to the stored temperature-frequency drift curve, thereby compensating the detection frequency to obtain a compensation frequency;
and step S22, calculating a power compensation value based on the detected temperature according to the stored temperature-power drift curve, and compensating the detected power to obtain the compensation power.
From the above description, it can be known that power and frequency are compensated according to the temperature-frequency drift curve and the temperature-power drift curve, so that errors of power and frequency caused by temperature are effectively eliminated, and the detection accuracy is improved.
Further, the step S2 includes:
the temperature-frequency curve is stored in the form of a plurality of temperature point locations and corresponding frequency point locations, the temperature-power curve is stored in the form of a plurality of temperature point locations and corresponding power point locations,
the step S21 specifically includes:
according to the detection temperature, two temperature point locations which are closest to the temperature value of the detection temperature are selected from the stored temperature-frequency drift curve to obtain corresponding frequency point locations, and the frequency compensation value of the detection temperature is obtained in a linear calculation mode;
the step S22 specifically includes:
and according to the detected temperature, selecting two temperature point locations which are closest to the temperature value of the detected temperature from the stored temperature-frequency drift curve to obtain corresponding power point locations, and obtaining a power compensation value of the detected temperature in a linear calculation mode.
From the above description, the temperature-frequency curve and the temperature-power curve are stored in a point location manner, and when the temperature-frequency curve and the temperature-power curve are used, a specific compensation value is obtained in a linear calculation manner, so that the detection precision is improved compared with a table look-up method, the calculation efficiency is improved compared with a formula manner, and the requirements of sampling speed and precision are considered.
Further, the step S3 is followed by:
and step S4, calculating a polynomial of the output power according to a plurality of sampling powers in historical data, and obtaining the current output power according to the current sampling power and the polynomial.
From the above description, it can be known that, obtaining the polynomial according to the sampling power and obtaining the power value according to the polynomial have higher accuracy compared with the power value obtained by sampling, and further increase the accuracy of detection.
Further, the step S4 calculates a polynomial of the sampling power by using the following formula:
in the formula, yi denotes a power value of the ith sampling power, and xi denotes a time of the ith sampling power.
From the above description, the lagrange interpolation method finds the power polynomial, and improves the detection accuracy.
Referring to fig. 2, a frequency power meter with power compensation includes a power detection circuit, a temperature compensation circuit, a frequency detection circuit, an upper computer interface and a controller, the controller is electrically connected to the temperature compensation circuit, the power detection circuit, the upper computer interface and the frequency detection circuit, the controller includes a computer program stored on the controller and capable of running on the controller, and the controller implements the following steps when executing the computer program:
step S1, acquiring the detection frequency of the frequency detection circuit, the detection temperature of the temperature sensor and the detection power of the power detection circuit in real time;
step S2, compensating the detection frequency and the detection power according to the detection temperature, thereby obtaining a compensation frequency and a compensation power;
and step S3, calculating a compensation value for the compensation power according to the compensation frequency and the frequency-power curve based on the compensation frequency and the compensation power obtained in the step S2, thereby obtaining the final sampling power.
From the above description, the beneficial effects of the present invention are: the step S2 includes compensating the detection frequency and the detection power by using the temperature value, and further compensating the power value according to the compensated detection frequency value and the compensated detection power value, so as to effectively improve the detection accuracy of the frequency power meter and obtain a high-accuracy frequency power meter, where:
step S21, calculating a frequency compensation value based on the detection temperature according to the stored temperature-frequency drift curve, thereby compensating the detection frequency to obtain a compensation frequency;
and step S22, calculating a power compensation value based on the detected temperature according to the stored temperature-power drift curve, and compensating the detected power to obtain the compensation power.
From the above description, it can be known that power and frequency are compensated according to the temperature-frequency drift curve and the temperature-power drift curve, so that errors of power and frequency caused by temperature are effectively eliminated, and the detection accuracy is improved.
Further, the step S2 includes:
the temperature-frequency curve is stored in the form of a plurality of temperature point locations and corresponding frequency point locations, the temperature-power curve is stored in the form of a plurality of temperature point locations and corresponding power point locations,
the step S21 specifically includes:
according to the detection temperature, two temperature point locations which are closest to the temperature value of the detection temperature are selected from the stored temperature-frequency drift curve to obtain corresponding frequency point locations, and the frequency compensation value of the detection temperature is obtained in a linear calculation mode;
the step S22 specifically includes:
and according to the detected temperature, selecting two temperature point locations which are closest to the temperature value of the detected temperature from the stored temperature-frequency drift curve to obtain corresponding power point locations, and obtaining a power compensation value of the detected temperature in a linear calculation mode.
From the above description, the temperature-frequency curve and the temperature-power curve are stored in a point location manner, and when the temperature-frequency curve and the temperature-power curve are used, a specific compensation value is obtained in a linear calculation manner, so that the detection precision is improved compared with a table look-up method, the calculation efficiency is improved compared with a formula manner, and the requirements of sampling speed and precision are considered.
Further, the step S3 is followed by:
and step S4, calculating a polynomial of the output power according to a plurality of sampling powers in historical data, and obtaining the current output power according to the current sampling power and the polynomial.
From the above description, it can be known that, obtaining the polynomial according to the sampling power and obtaining the power value according to the polynomial have higher accuracy compared with the power value obtained by sampling, and further increase the accuracy of detection.
Further, the step S4 calculates a polynomial of the sampling power by using the following formula:
in the formula, yiRefers to the power value of the ith sampling power, and xi refers to the time of the ith sampling power.
The invention is suitable for detecting the power and the frequency of signals, in particular to the power and the frequency of radio frequency signals of various industrial and military equipment.
Referring to fig. 1, a first embodiment of the present invention is: a power compensation method comprising the following steps performed in sequence:
and step S1, acquiring the detection frequency of the frequency detection circuit, the detection temperature of the temperature sensor and the detection power of the power detection circuit in real time.
The power detection circuit and the frequency detection circuit are respectively used for detecting the power and the frequency of an input radio frequency signal, and the temperature sensor is used for detecting the ambient temperature.
And step S2, compensating the detection frequency and the detection power according to the detection temperature, thereby obtaining a compensation frequency and a compensation power.
Specifically, the method includes step S21, calculating a frequency compensation value based on the detected temperature according to a stored temperature-frequency drift curve, so as to compensate the detected frequency, thereby obtaining a compensation frequency;
and step S22, calculating a power compensation value based on the detected temperature according to the stored temperature-power drift curve, and compensating the detected power to obtain the compensation power.
Specifically, the temperature-frequency curve and the temperature-power curve are stored in the form of a plurality of temperature point locations and corresponding frequency point locations and power point locations, the two closest temperature point locations are selected according to the detected temperature obtained through detection to obtain corresponding frequency point locations and power point locations, the power compensation value and the frequency compensation value of the detected temperature are obtained in a linear calculation mode, and then the detected power and the detected frequency are compensated.
And step S3, calculating a compensation value for the compensation power according to the compensation frequency and the frequency-power curve based on the compensation frequency and the compensation power obtained in step S2, thereby obtaining the final sampling power.
Step S4, calculating a polynomial of output power according to a plurality of sampling powers in historical data, and obtaining the current output power according to the current sampling power and the polynomial. The power is further corrected, and the accuracy of the power is improved.
Specifically, the polynomial of the sampling power is calculated by using the following formula:
in the formula, yiRefers to the power value of the ith sampling power, and xi refers to the time of the ith sampling power.
The second embodiment of the invention is as follows:
referring to fig. 2, a frequency power meter with power compensation includes a power detection circuit, a power supply circuit, a temperature compensation circuit, a frequency detection circuit, a controller and a PC104 interface as an interface of an upper computer, wherein the power supply circuit is electrically connected to the power detection circuit, the temperature compensation circuit, the frequency detection circuit and the controller, and the controller is electrically connected to the temperature compensation circuit, the power detection circuit and the frequency detection circuit.
The controller includes a computer program stored on and executable on the controller, and the controller implements the steps of the first embodiment when executing the computer program.
The temperature compensation circuit comprises a temperature sensor which is electrically connected with the controller so as to output a temperature detection signal to compensate the detection frequency of the frequency detection circuit and the temperature of the temperature detection circuit.
The power detection circuit comprises a detection isolation circuit, a signal conditioning circuit, a high-speed acquisition circuit and a data storage circuit which are sequentially connected, and further comprises a power test FPGA main control circuit, the frequency detection circuit comprises a frequency division circuit, a counting circuit, a channel selection circuit and a channel control circuit which are sequentially connected, and further comprises the power test FPGA main control circuit.
The detection isolation circuit is used for detecting an input radio frequency signal, outputting a low-frequency voltage signal and carrying out isolation amplification on the low-frequency voltage signal; the signal conditioning circuit is used for amplifying, filtering and converting the detection voltage signal after isolation and amplification; the AD acquisition circuit samples the signal voltage at high speed and high precision and converts the signal voltage into a discrete digital signal to be output; the data storage circuit stores the sampled discrete signals into an RAM for calling and processing;
the frequency dividing circuit divides the frequency of the radio frequency signal into a signal with lower frequency so as to facilitate counting; the counting circuit measures the frequency of the signal by counting; the controller is used for carrying out logic control including timing signal generation, address decoding and various read-write control on the functional circuit of the whole power frequency meter card;
the PC104 interface circuit provides a basic power supply, is in charge of communication with a PC104 bus of the upper computer, receives data sent by the upper computer and sends the sampled data to the upper computer; the power supply circuit generates various DC power supply voltages required by the circuit by converting the basic power supply.
Specifically, as shown in fig. 3, the detection isolation circuit inputs a radio frequency signal from a socket J4 of SMA, and sends the radio frequency signal to a diode probe D0 for envelope detection, and the detected low frequency signal is sent to a chip U9 of model AD8065 for operation, isolation and amplification to output a signal AIN 0. Diodes D5 and D6 are connected between the cathode of diode D0 and ground to act as voltage limiting protection diodes, and capacitors C45 and C50 are filter capacitors.
4-9, the AIN0 signal output by the detection isolation circuit is sent to an amplifier U15 for amplification, the signal amplified by U15 is sent to a single-ended to differential amplifier U3, and differential signals 38OUT + and 38 OUT-are output. The relay K1 is used for controlling whether the AIN0 is amplified through the U15, if the signal voltage is enough, the signal can be directly sent to the U3 for differential amplification without amplification, and the signals 38OUT + and 38 OUT-output by the U3 are sent to the programmable amplifier U5 for further amplification. Similarly, relays K2 and K3 control whether the signals pass through the program-controlled amplifier U5, and if the signals do not need to be amplified, the INH and INL differential signals are directly output to the AD sampling circuit through the relays. The relays K1, K2 and K3 are controlled by the U1, and control signals of the U1 and the programmable amplifier U5 are generated by the controller.
10-13, the differential signals INH and INL output by the signal adjusting circuit are sent to the input end of a high-speed sampling chip U4 for sampling, a clock chip U2 generates a 100MHz clock, and a differential clock pair ENC required by the sampling chip is generated through conversion of a chip U10 and a coil T1. And after the U4 finishes sampling, outputting 14-bit precision digital signals RAM _ DATA 0-RAM _ DATA13 to the DATA storage circuit and the FPGA main control chip U15, wherein control signals of the sampling chip are generated by the controller.
The data storage circuit mainly comprises a RAM memory chip U14, and all control signals of U14 are generated by a controller.
The frequency dividing circuit is divided into two modules, wherein one high-frequency dividing module is used for dividing the frequency of a signal with higher frequency (more than 1GHz), and the other low-frequency dividing module is used for dividing the frequency of a signal with lower frequency (less than 1 GHz).
As shown in fig. 14, the low-frequency division module mainly comprises three frequency division chips D11, D12, and D13, wherein D13 realizes the first-stage frequency division, obtains a signal FX0, sends the signal to the controller for counting, and selects and controls channels according to the counting result; d11 and D12 implement the second stage of frequency division to obtain signal FX1, which is sent to the controller for counting, judgment and channel control.
As shown in fig. 15, the high frequency division module mainly comprises an amplifier U27 AD8561 and a frequency divider SCH1, and since the high frequency signal is attenuated greatly, the high frequency signal is amplified by U27 and then sent to SCH1 for frequency division processing, and a generated signal FX2 is sent to the FPGA for counting and channel processing control.
In summary, according to the power compensation method and the frequency power meter with power compensation provided by the invention, the detection frequency and the detection power are compensated by using the temperature value, the power value is further compensated according to the compensated detection frequency value and the compensated detection power value, and finally the detection power is finally compensated by using the thrice lagrange interpolation method to obtain the final power value, so that the detection precision of the frequency power meter is effectively improved, and the high-precision frequency power meter is obtained.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method of power compensation, comprising the steps of:
step S1, acquiring the detection frequency of the frequency detection circuit, the detection temperature of the temperature sensor and the detection power of the power detection circuit in real time;
step S2, compensating the detection frequency and the detection power according to the detection temperature, thereby obtaining a compensation frequency and a compensation power;
and step S3, calculating a compensation value for the compensation power according to the compensation frequency and the frequency-power curve based on the compensation frequency and the compensation power obtained in the step S2, thereby obtaining the final sampling power.
2. The power compensation method according to claim 1, wherein the step S2 specifically includes:
step S21, calculating a frequency compensation value based on the detection temperature according to the stored temperature-frequency drift curve, thereby compensating the detection frequency to obtain a compensation frequency;
and step S22, calculating a power compensation value based on the detected temperature according to the stored temperature-power drift curve, and compensating the detected power to obtain the compensation power.
3. A power compensation method according to claim 2, wherein the temperature-frequency curve is stored as a plurality of temperature point locations and corresponding frequency point locations, the temperature-power curve is stored as a plurality of temperature point locations and corresponding power point locations,
the step S21 specifically includes:
according to the detection temperature, two temperature point locations which are closest to the temperature value of the detection temperature are selected from the stored temperature-frequency drift curve to obtain corresponding frequency point locations, and the frequency compensation value of the detection temperature is obtained in a linear calculation mode;
the step S22 specifically includes:
and according to the detected temperature, selecting two temperature point locations which are closest to the temperature value of the detected temperature from the stored temperature-frequency drift curve to obtain corresponding power point locations, and obtaining a power compensation value of the detected temperature in a linear calculation mode.
4. The power compensation method of claim 1, wherein the step S3 is further followed by:
and step S4, calculating a polynomial of the output power according to a plurality of sampling powers in historical data, and obtaining the current output power according to the current sampling power and the polynomial.
5. The power compensation method of claim 1, wherein the step S4 is implemented by calculating a polynomial of the sampled power according to the following formula:
in the formula, yiRefers to the power value of the ith sampling power, xiRefers to the time of the ith sample power.
6. The utility model provides a frequency power meter with power compensation which characterized in that, includes power detection circuitry, temperature compensation circuit, frequency detection circuit, host computer interface and controller, and the controller electricity respectively connects temperature compensation circuit, power detection circuit, host computer interface and frequency detection circuit, the controller includes the computer program that stores on the controller and can be operated on the controller, realizes following step when the controller carries out the computer program:
step S1, acquiring the detection frequency of the frequency detection circuit, the detection temperature of the temperature sensor and the detection power of the power detection circuit in real time;
step S2, compensating the detection frequency and the detection power according to the detection temperature, thereby obtaining a compensation frequency and a compensation power;
and step S3, calculating a compensation value for the compensation power according to the compensation frequency and the frequency-power curve based on the compensation frequency and the compensation power obtained in the step S2, thereby obtaining the final sampling power.
7. The power compensation method according to claim 6, wherein the step S2 specifically includes:
step S21, calculating a frequency compensation value based on the detection temperature according to the stored temperature-frequency drift curve, thereby compensating the detection frequency to obtain a compensation frequency;
and step S22, calculating a power compensation value based on the detected temperature according to the stored temperature-power drift curve, and compensating the detected power to obtain the compensation power.
8. A power compensation method according to claim 7, wherein the temperature-frequency curve is stored as a plurality of temperature point locations and corresponding frequency point locations, the temperature-power curve is stored as a plurality of temperature point locations and corresponding power point locations,
the step S21 specifically includes:
according to the detection temperature, two temperature point locations which are closest to the temperature value of the detection temperature are selected from the stored temperature-frequency drift curve to obtain corresponding frequency point locations, and the frequency compensation value of the detection temperature is obtained in a linear calculation mode;
the step S22 specifically includes:
and according to the detected temperature, selecting two temperature point locations which are closest to the temperature value of the detected temperature from the stored temperature-frequency drift curve to obtain corresponding power point locations, and obtaining a power compensation value of the detected temperature in a linear calculation mode.
9. The power compensation method of claim 6, wherein the step S3 is further followed by:
and step S4, calculating a polynomial of the output power according to a plurality of sampling powers in historical data, and obtaining the current output power according to the current sampling power and the polynomial.
10. The power compensation method of claim 6, wherein the step S4 is implemented by calculating a polynomial of the sampled power according to the following formula:
in the formula, yiRefers to the power value of the ith sampling power, xiRefers to the time of the ith sample power.
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Inventor after: Luo Xianquan Inventor after: Zhong Chen Inventor after: Shan Chengjin Inventor before: Luo Xianquan Inventor before: Zhong Chen Inventor before: Shan Chengjin Inventor before: Ma Juntao Inventor before: Lv Guizhou |