CN105510852A - Output power calibration method of radio frequency excitation source based on linear interpolation - Google Patents
Output power calibration method of radio frequency excitation source based on linear interpolation Download PDFInfo
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- CN105510852A CN105510852A CN201510282147.9A CN201510282147A CN105510852A CN 105510852 A CN105510852 A CN 105510852A CN 201510282147 A CN201510282147 A CN 201510282147A CN 105510852 A CN105510852 A CN 105510852A
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Abstract
The invention relates to an output power calibration method of a radio frequency excitation source based on linear interpolation, and belongs to the technical field of power calibration. The method makes an improvement on the basis of a general "dichotomy" calibration algorithm, according to the requirement of calibration accuracy, determines the stepping frequency and tolerance reasonably, determines the size and position of each calibration interval in a calibration frequency band, then uses the "dichotomy" for boundary points of the intervals, and calibrates most of the remaining frequency points by way of linear interpolation. The method in the invention substantially reduces the calibration time and improves the calibration frequency while meeting the requirement of calibration accuracy.
Description
Technical field
The present invention relates to calibration of power technical field, be specifically related to a kind of output power calibration steps of the radio-frequency (RF) excited source based on linear interpolation.
Background technology
In electronic measuring instrument, radio-frequency (RF) excited source, as a kind of signal source of multiduty radio frequency band, is widely used in the various field tests such as vector network analysis, frequency spectrum tracking.The signal power that radio-frequency (RF) excited source exports in its frequency range must accurately and be stablized, and the calibration of power is the important method of realizing this goal.Whole power calibration procedure mainly comprises two parts: one is utilize cable, external control devices, radio-frequency (RF) excited source and power meter to set up calibration platform; Two is use peripheral control unit to adopt certain calibration algorithm to control radio-frequency (RF) excited source and power meter by cable, obtains the data after calibration, and is stored in the storer in radio-frequency (RF) excited source, in order to calling after radio-frequency (RF) excited source.
The peripheral control unit used in calibration process is generally PC, and the cable of use is generally GPIB cable, USB cable or netting twine.The process flow diagram of calibration control procedure as shown in Figure 1, outside PC synchronization settings driving source and the parameter (as frequency etc.) of power meter, then start calibration algorithm program, driving source outputs signal to power meter, provides performance number to PC after the power of power meter measured signal; After algorithm routine terminates, final calibration data is stored in driving source by PC.
The calibration algorithm used in calibration process more typically has dichotomy, Adaptive evolvement arithmetic etc.Adaptive evolvement arithmetic is high due to its complicacy, often need equipment costly to set up calibration platform, and the hardware requirement of radio frequency driving source is higher, is not generally suitable for radio-frequency (RF) excited source; The general calibration algorithm used is dichotomy now.
The block diagram of the collimation technique scheme of typical dichotomy is as shown in Figure 2: after calibration starts, first maximal value max, the minimum value min of setpoint frequency F, power P, tolerance σ and attenuator, then obtaining this frequency in the value of attenuator is A
1, A
2time output power value P
1, P
2.Then, P and P is compared
1, P
2size.
If P
1< P < P
2, then obtaining this frequency in the value of attenuator is A
3=(A
1+ A
2output power value P during)/2
3.Then, P is compared
3with the absolute value of the difference of P | P
3-P| and tolerance σ.If | P
3-P| > σ, P
3-P < 0 or P
3during-P > 0, correspondence changes the value A of attenuator respectively
1and A
2, after iterative cycles, until | P
3-P|≤σ; If | P
3-P|≤σ, the value A of the attenuator of this frequency optimum
bestfor A
3, optimum output power value P
bestfor P
3, the calibration of this frequency terminates.
If P≤P
1, when | P-P
1| during≤σ, the value A of the attenuator of this frequency optimum
bestfor A
1, optimum output power value P
bestfor P
1, terminate calibration; When | P-P
1| during > σ, calibrate unsuccessfully, ask to change P or σ, terminate calibration.
If P>=P
2, when | P-P
2| during≤σ, the value A of the attenuator of this frequency optimum
bestfor A
2, optimum output power value P
bestfor P
2, terminate calibration; When | P-P
2| during > σ, calibrate unsuccessfully, ask to change P or σ, terminate calibration.
Adopting each frequency in the calibration frequency range of dichotomy radio frequency driving source to calibrate one by one successively, finally completing the calibration of power to outputing signal in calibration frequency range.
The above-mentioned prior art for the portable driving source calibration of power, the alignment time is longer, and production efficiency is poor, and also needs to increase hardware cost, is therefore badly in need of a kind of little to hardware cost requirement, the novel calibration steps that efficiency is high.
Summary of the invention
The object of the invention is to overcome the defect existed in above-mentioned prior art, a kind of output power calibration steps of the radio-frequency (RF) excited source based on linear interpolation is provided.
In order to achieve the above object, the present invention mainly comprises the following steps:
Steps A: use connecting line peripheral control unit, power meter to be connected with radio-frequency (RF) excited source to be measured, composition calibration platform;
Step B: start calibration;
Step C: the beginning frequency F of setting calibration frequency range
begin, stop frequency F
stopwith step frequency F
step;
Step D: Offered target performance number P
0, attenuator minimum step value Δ
0, tolerance σ
0, and guarantee σ
0>=Δ
0;
Step e: current alignment frequency F is set
temp=F
begin, timing point N=1;
Step F: current alignment frequency F is set
tempunder the value A of attenuator of optimum
n=0, optimum output power value P
n=0;
Step G: bring parameter P into
0, F
temp, Δ
0, σ
0, enter dichotomy single-frequency point calibration routine and calibrate;
Step H: use dichotomy single-frequency point calibration routine to calibrate;
Step I: after dichotomy single-frequency point calibration routine completes calibration, draws A
bestand P
best;
Step J: upgrade A
n=A
best, P
n=P
best, N=N+1;
Step K: judge F
tempwhether equal F
stopif, F
tempequal F
stop, enter step N; If F
tempbe not equal to F
stop, enter step L;
Step L: F is set
temp=F
temp+ F
stepif, F
tempbe not less than F
stop, enter step M; If F
tempbe less than F
stop, enter step F;
Step M: upgrade F
temp=F
stop, enter step F;
Step N: complete the dichotomy calibration to each interval border point in calibration frequency range;
Step O: substitute into parameter F
begin, F
stop, F
stepand sequence A
1to A
n+1, enter interpolation calibration routine and calibrate, wherein, A
n+1represent and carry out after dichotomy single-frequency point calibration routine calibrates to N+1 frontier point in calibration frequency range, the value of the attenuator of the optimum at this frequency place of acquisition;
Step P: use interpolation calibration routine to calibrate;
Step Q: after interpolation calibration routine has been calibrated, draws the slope K of the fitting a straight line of the value of the attenuator in each interval
1to K
n;
Step R: calibration terminates;
Step S: the output of the value of each frequency attenuator in calibration frequency range, can be divided into 2 classes:
1. the value of calibrating the attenuator of B frontier point in frequency range is A
b, 1≤B≤(N+1);
2. the value A of the attenuator of any frequency f in M interval
f=A
m+ K
m× { f-F
m.
Wherein, 1≤M≤N, F
m-1≤ f≤F
m; A
mrepresent and carry out after dichotomy single-frequency point calibration routine calibrates to M frontier point in calibration frequency range, the value of the attenuator of the optimum at this frequency place of acquisition; K
mit is the slope of the fitting a straight line of the value of the attenuator in M lattice interval; F
m=F
begin+ (M-1) × F
step.
Step T: the data obtained after calibration are stored in the storer in radio-frequency (RF) excited source to be measured.
In technique scheme, described step H comprises the following steps:
Step H1: start to carry out dichotomy calibration to current frequency;
Step H2: frequency F=F is set
temp, power P=P
0, tolerance σ=σ
0with the minimum step value Δ=Δ of attenuator
0, and σ>=Δ;
Step H3: setting a
1for maximal value max, a of attenuator
2for the minimum value min of attenuator;
Step H4: the value A that attenuator is set
1=a
1, obtain the output power value P of this frequency
1;
Step H5: the value A that attenuator is set
2=a
2, obtain the output power value P of this frequency
2;
Step H6: compare P and P
1, P
2size, if P
1< P < P
2, enter step H7; If P≤P
1, enter step H21;
If P>=P
2, enter step H23;
Step H7: the value arranging attenuator is A
3=(A
1+ A
2)/2, obtain the output power value P of this frequency
3;
Step H8: calculate | P
3the value of-P|-σ, if | P
3-P|≤σ, enters step H12; If | P
3-P| > σ, enters step H9;
Step H9: calculate P
3the value of-P, if P
3-P < 0, enters step H10; If P
3-P > 0, enters step H11;
Step H10: setting a
1=A
3, a
2=A
2, enter step H4;
Step H11: setting a
1=A
1, a
2=A
3, enter step H4;
Step H12: setting A
temp=A
3, A
pre=A
3, P
temp=P
3, P
pre=P
3, wherein, A
tempfor the value of current attenuator, A
prefor the value of the attenuator of last time, P
tempfor current performance number, P
prefor the performance number of last time;
Step H13: calculate P
3the value of-P, if P
3-P < 0, enters step H14; If P
3-P>=0, enters step H16;
Step H14: upgrade P
pre=P
temp, A
pre=A
temp, the value of setting attenuator is A
temp=A
temp-Δ, obtains the output power value P of this frequency
temp;
Step H15: calculate P
tempthe value of-P, if P
temp-P < 0, enters step H14; If P
temp-P>=0, enters step H18;
Step H16: upgrade P
pre=P
temp, A
pre=A
temp, the value of setting attenuator is A
temp=A
temp+ Δ, obtains the output power value P of this frequency
temp;
Step H17: calculate P
tempthe value of-P, if P
temp-P≤0, enters step H18; If P
temp-P > 0, enters step H16;
Step H18: calculate | P
temp|-| P
pre| value, if | P
temp|-| P
pre|≤0, enter step H19; If | P
temp|-| P
pre| > 0, enters step H20;
Step H19: the value A of the attenuator of this frequency optimum
bestfor A
temp, the output power value P of this frequency optimum
bestfor P
temp, enter step H26;
Step H20: the value A of the attenuator of this frequency optimum
bestfor A
pre, the output power value P of this frequency optimum
bestfor P
pre, enter step H26;
Step H21: judge whether | P-P
1|≤σ, if | P-P
1|≤σ, enters step H22; If | P-P
1| > σ, enters step H25;
Step H22: the value A of the attenuator of this frequency optimum
bestfor A
1, the output power value P of this frequency optimum
bestfor P
1, enter step H26;
Step H23: judge whether | P-P
2|≤σ, if | P-P
2|≤σ, enters step H24; If | P-P
2| > σ, enters step H25;
Step H24: the value A of the attenuator of this frequency optimum
bestfor A
2, the output power value P of this frequency optimum
bestfor P
2, enter step H26;
Step H25: calibrate unsuccessfully, request change P or σ;
Step H26: terminate the calibration of current frequency dichotomy.
In technique scheme, described step P comprises the following steps:
Step P1: start to carry out interpolation calibration to each interval of current frequency range;
Step P2: the initial frequency F that current interval is set
1=F
begin, stop frequency F
2=F
begin+ F
step, timing point N=1 is set;
Step P3: calculate F
2-F
stopvalue, if F
2-F
stop< 0, enters step P5; If F
2-F
stop>=0, enter step P4;
Step P4: upgrade F
2=F
stop;
Step P5: setting current interval initial frequency F
1to stopping frequency F
2the slope K of fitting a straight line of value of attenuator
n[initial value] be 0;
Step P6: calculating K
n=(A
n+1-A
n)/(F
2-F
1), replace initial value 0 by the value calculated;
Step P7: determine F
2whether equal F
stopif, F
2equal F
stop, enter step P10; If F
2be not equal to F
stop, enter step P8;
Step P8: upgrade N=N+1, frequency F is set
temp=F
2;
Step P9: the initial frequency F that current interval is set
1=F
temp, stop frequency F
2=F
temp+ F
step, enter step P3;
Step P10: terminate interpolation calibration.
In technique scheme, described peripheral control unit is computing machine.
In technique scheme, described connecting line is GPIB cable, USB cable or netting twine.
The output power calibration steps in the radio-frequency (RF) excited source based on linear interpolation that the present invention adopts has significant technique effect, when the degree of accuracy of calibrating meets the demands, substantially reduces the alignment time, improves calibration efficiency.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of calibration control procedure;
Fig. 2 is the block diagram of the collimation technique scheme of typical dichotomy;
Fig. 3 is the overview flow chart based on the output power calibration steps of linear interpolation in the present invention;
Fig. 4 is the process flow diagram to " single frequency point carries out dichotomy calibration " in the present invention;
Fig. 5 is the process flow diagram to " linear interpolation calibration is carried out in each interval of current frequency range " in the present invention;
Fig. 6 is in the two-dimensional coordinate system (F, A) formed in the value of frequency and attenuator in the present invention, according to 2 frontier point (F in the N number of interval of current alignment frequency range
1, A
n), (F
2, A
n+1) solve fitting a straight line slope K
nschematic diagram;
Fig. 7 is in the two-dimensional coordinate system (F, A) formed in the value of frequency and attenuator in the present invention, according to 2 frontier point (F in calibration frequency range M interval
m, A
m), (F
m+1, A
m+1) and the slope K of fitting a straight line
m, solve the value A of the attenuator of frequency f
fschematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Fig. 3-Fig. 7, the invention provides a kind of output power calibration steps of the radio-frequency (RF) excited source based on linear interpolation, for carrying out quickly calibrated in frequency range to output power, the method that described output power calibration steps have employed " in calibration frequency range, the frontier point in each interval adopts dichotomy calibration " and " in each interval, frequency adopts interpolation calibration " combines.Embodiment is calibrated to example with the output power in the radio-frequency (RF) excited source to a 1MHz ~ 6GHz, and the present invention is described in detail, the output power of radio-frequency (RF) excited source before calibration within the scope of calibration frequency range 1MHz ~ 6GHz is all greater than-10dBm and is less than 0dBm, require after calibration that the output power in radio-frequency (RF) excited source is for-10dBm, and error is ± 0.5dBm, described output power calibration steps comprises the following steps:
Steps A: use connecting line peripheral control unit, power meter to be connected with radio-frequency (RF) excited source to be measured, composition calibration platform;
Step B: start calibration;
Step C: the beginning frequency F of setting calibration frequency range
beginfor 1MHz, stop frequency F
stopfor 6MHz and step frequency F
stepfor 100MHz;
Step D: Offered target performance number P
0for the minimum step value Δ of-10dBm, attenuator
0for 0.1dBm, tolerance σ
0for 0.5dBm;
Step e: current alignment frequency F is set
temp=F
begin=1MHz, timing point N=1;
Step F: current alignment frequency F is set
tempunder the value A of attenuator of optimum
n=0, optimum output power value P
n=0;
Step G: bring parameter P into
0, F
temp, Δ
0, σ
0, enter dichotomy single-frequency point calibration routine and calibrate;
Step H: use dichotomy single-frequency point calibration routine to adopt optimised dichotomy to calibrate;
Step I: after dichotomy single-frequency point calibration routine completes calibration, draws the value A of the attenuator of current frequency optimum
bestwith the output power value P of optimum
best;
Step J: upgrade A
n=A
best, P
n=P
best, N=N+1, prepare carry out next round circulation;
Step K: judge F
tempwhether equal F
stopif, F
tempequal F
stop, illustrate to the termination frequency F of current frequency range
stopcomplete dichotomy calibration, enter step N; If F
tempbe not equal to F
stop, illustrate and also have interval frontier point not carry out dichotomy calibration, enter step L;
Step L: F is set
temp=F
temp+ F
stepif, F
tempbe not less than F
stop, the frontier point F in last interval is described
stopdo not carry out dichotomy calibration, enter step M; If F
tempbe less than F
stop, enter step F, carry out the dichotomy calibration of next interval frontier point;
Step M: upgrade F
temp=F
stop, enter step F;
Step N: complete the dichotomy calibration to each interval border point in calibration frequency range, obtain the sequence A of the value of optimum attenuator
1to A
61, optimum output power value sequence P
1to P
61;
Step O: bring parameter F into
begin=1MHz, F
stop=6MHz and F
step=100MHz and sequence A
1to A
61, enter interpolation calibration routine and calibrate, wherein, A
n+1represent and carry out after dichotomy single-frequency point calibration routine calibrates to N+1 frontier point in calibration frequency range, the value of the attenuator of the optimum at this frequency place of acquisition, 1≤N+1≤61;
Step P: use interpolation calibration routine to calibrate;
Step Q: after interpolation calibration routine has been calibrated, draws the slope K of the fitting a straight line of the value of the attenuator in each interval
1to K
60;
Step R: calibration terminates;
Step S: the output of the value of each frequency attenuator in calibration frequency range, can be divided into 2 classes:
1. the value of calibrating the attenuator of B frontier point in frequency range is A
b, 1≤B≤61;
2. the value A of the attenuator of any frequency f in M interval
f=A
m+ K
m× { f-F
m.
Wherein, 1≤M≤60, F
m-1≤ f≤F
m; A
mrepresent and carry out after dichotomy single-frequency point calibration routine calibrates to M frontier point in calibration frequency range, the value of the attenuator of the optimum at this frequency place of acquisition; K
mit is the slope of the fitting a straight line of the value of the attenuator in M lattice interval; F
m=1MHz+ (M-1) × 100MHz.
Step T: the data obtained after calibration are stored in the storer in radio-frequency (RF) excited source to be measured.
Further, above-mentioned steps H comprises the following steps:
Step H1: start to carry out dichotomy calibration to current frequency;
Step H2: frequency F=F is set
temp, power P=P
0=-10dBm, tolerance σ=σ
0the minimum step value Δ=Δ of=0.5dBm and attenuator
0=0.1dBm;
Step H3: setting a
1for maximal value max=31.5dBm, a of attenuator
2for the minimum value min=0dBm of attenuator;
Step H4: the value A that attenuator is set
1=a
1, obtain the output power value P of this frequency
1;
Step H5: the value A that attenuator is set
2=a
2, obtain the output power value P of this frequency
2;
Step H6: compare P and P
1, P
2size, if P
1< P < P
2, enter step H7; If P≤P
1, enter step H21;
If P>=P
2, enter step H23;
Step H7: the value arranging attenuator is A
3=(A
1+ A
2)/2, obtain the output power value P of this frequency
3;
Step H8: calculate | P
3the value of-P|-σ, if | P
3-P|≤σ, enters step H12; If | P
3-P| > σ, enters step H9;
Step H9: calculate P
3the value of-P, if P
3-P < 0, enters step H10; If P
3-P > 0, enters step H11;
Step H10: setting a
1=A
3, a
2=A
2, enter step H4;
Step H11: setting a
1=A
1, a
2=A
3, enter step H4;
Step H12: setting A
temp=A
3, A
pre=A
3, P
temp=P
3, P
pre=P
3, wherein, A
tempfor the value of current attenuator, A
prefor the value of the attenuator of last time, P
tempfor current performance number, P
prefor the performance number of last time;
Step H13: calculate P
3the value of-P, if P
3-P < 0, enters step H14; If P
3-P>=0, enters step H16;
Step H14: upgrade P
pre=P
temp, A
pre=A
temp, the value of setting attenuator is A
temp=A
temp-Δ, obtains the output power value P of this frequency
temp;
Step H15: calculate P
tempthe value of-P, if P
temp-P < 0, enters step H14; If P
temp-P>=0, enters step H18;
Step H16: upgrade P
pre=P
temp, A
pre=A
temp, the value of setting attenuator is A
temp=A
temp+ Δ, obtains the output power value P of this frequency
temp;
Step H17: calculate P
tempthe value of-P, if P
temp-P≤0, enters step H18; If P
temp-P > 0, enters step H16;
Step H18: calculate | P
temp|-| P
pre| value, if | P
temp|-| P
pre|≤0, enter step H19; If | P
temp|-| P
pre| > 0, enters step H20;
Step H19: the value A of the attenuator of this frequency optimum
bestfor A
temp, the output power value P of this frequency optimum
bestfor P
temp, enter step H26;
Step H20: the value A of the attenuator of this frequency optimum
bestfor A
pre, the output power value P of this frequency optimum
bestfor P
pre, enter step H26;
Step H21: judge whether | P-P
1|≤σ, if | P-P
1|≤σ, enters step H22; If | P-P
1| > σ, enters step H25;
Step H22: the value A of the attenuator of this frequency optimum
bestfor A1, the output power value P of this frequency optimum
bestfor P
1, enter step H26;
Step H23: judge whether | P-P
2|≤σ, if | P-P
2|≤σ, enters step H24; If | P-P
2| > σ, enters step H25;
Step H24: the value A of the attenuator of this frequency optimum
bestfor A
2, the output power value P of this frequency optimum
bestfor P
2, enter step H26;
Step H25: calibrate unsuccessfully, request change P or σ;
Step H26: terminate the calibration of current frequency dichotomy.
Further, above-mentioned steps P comprises the following steps:
Step P1: start to carry out interpolation calibration to each interval of current frequency range;
Step P2: the initial frequency F that current interval is set
1=F
begin=1MHz, termination frequency F
2=F
begin+ F
step=101MHz, arranges timing point N=1;
Step P3: calculate F
2-F
stopvalue, if F
2-F
stop< 0, enters step P5; If F
2-F
stop>=0, enter step P4;
Step P4: upgrade F
2=F
stop;
Step P5: setting current interval initial frequency F
1to stopping frequency F
2the slope K of fitting a straight line of value of attenuator
n[initial value] be 0;
Step P6: calculating K
n=(A
n+1-A
n)/(F
2-F
1), replace initial value 0 by the value calculated;
Step P7: determine F
2whether equal F
stop(i.e. 6GHz), if F
2equal F
stop(i.e. 6GHz), enters step P10; If F
2be not equal to F
stop(i.e. 6GHz), enters step P8;
Step P8: upgrade N=N+1, frequency F is set
temp=F
2;
Step P9: the initial frequency F that current interval is set
1=F
temp, stop frequency F
2=F
temp+ F
step, enter step P3, carry out next round circulation;
Step P10: terminate interpolation calibration.
The content be not described in detail in this instructions belongs to the known prior art of professional and technical personnel in the field.
Claims (5)
1., based on the output power calibration steps in the radio-frequency (RF) excited source of linear interpolation, it is characterized in that comprising the following steps:
Steps A: use connecting line peripheral control unit, power meter to be connected with radio-frequency (RF) excited source to be measured, composition calibration platform;
Step B: start calibration;
Step C: the beginning frequency F of setting calibration frequency range
begin, stop frequency F
stopwith step frequency F
step;
Step D: Offered target performance number P
0, attenuator minimum step value Δ
0, tolerance σ
0, and guarantee σ
0>=Δ
0;
Step e: current alignment frequency F is set
temp=F
begin, timing point N=1;
Step F: current alignment frequency F is set
tempunder the value A of attenuator of optimum
n=0, optimum output power value P
n=0;
Step G: substitute into parameter P
0, F
temp, Δ
0, σ
0, enter dichotomy single-frequency point calibration routine and calibrate;
Step H: use dichotomy single-frequency point calibration routine to calibrate;
Step I: after dichotomy single-frequency point calibration routine completes calibration, draws A
bestand P
best;
Step J: upgrade A
n=A
best, P
n=P
best, N=N+1;
Step K: judge F
tempwhether equal F
stopif, F
tempequal F
stop, enter step N; If F
tempbe not equal to F
stop, enter step L;
Step L: F is set
temp=F
temp+ F
stepif, F
tempbe not less than F
stop, enter step M; If F
tempbe less than F
stop, enter step F;
Step M: upgrade F
temp=F
stop, enter step F;
Step N: complete the dichotomy calibration to each interval border point in calibration frequency range;
Step O: bring parameter F into
begin, F
stop, F
stepand sequence A
1to A
n+1, enter interpolation calibration routine and calibrate, wherein, A
n+1represent and carry out after dichotomy single-frequency point calibration routine calibrates to N+1 frontier point in calibration frequency range, the value of the attenuator of the optimum at this frequency place of acquisition;
Step P: use interpolation calibration routine to calibrate;
Step Q: after interpolation calibration routine has been calibrated, draws the slope K of the fitting a straight line of the value of the attenuator in each interval
1to K
n;
Step R: calibration terminates;
Step S: the output of the value of each frequency attenuator in calibration frequency range, can be divided into 2 classes:
1. the value of calibrating the attenuator of B frontier point in frequency range is A
b, 1≤B≤(N+1);
2. the value A of the attenuator of any frequency f in M interval
f=A
m+ K
m× { f-F
m.
Wherein, 1≤M≤N, F
m-1≤ f≤F
m; A
mrepresent and carry out after dichotomy single-frequency point calibration routine calibrates to M frontier point in calibration frequency range, the value of the attenuator of the optimum at this frequency place of acquisition; K
mit is the slope of the fitting a straight line of the value of the attenuator in M lattice interval; F
m=F
begin+ (M-1) × F
step.
Step T: the data obtained after calibration are stored in the storer in radio-frequency (RF) excited source to be measured.
2. the output power calibration steps in the radio-frequency (RF) excited source based on linear interpolation according to claim 1, is characterized in that described step H comprises the following steps:
Step H1: start to carry out dichotomy calibration to current frequency;
Step H2: frequency F=F is set
temp, power P=P
0, tolerance σ=σ
0with the minimum step value Δ=Δ of attenuator
0, and σ>=Δ;
Step H3: setting a
1for maximal value max, a of attenuator
2for the minimum value min of attenuator;
Step H4: the value A that attenuator is set
1=a
1, obtain the output power value P of this frequency
1;
Step H5: the value A that attenuator is set
2=a
2, obtain the output power value P of this frequency
2;
Step H6: compare P and P
1, P
2size, if P
1< P < P
2, enter step H7; If P≤P
1, enter step H21; If P>=P
2, enter step H23;
Step H7: the value arranging attenuator is A
3=(A
1+ A
2)/2, obtain the output power value P of this frequency
3;
Step H8: calculate | P
3the value of-P|-σ, if | P
3-P|≤σ, enters step H12; If | P
3-P| > σ, enters step H9;
Step H9: calculate P
3the value of-P, if P
3-P < 0, enters step H10; If P
3-P > 0, enters step H11;
Step H10: setting a
1=A
3, a
2=A
2, enter step H4;
Step H11: setting a
1=A
1, a
2=A
3, enter step H4;
Step H12: setting A
temp=A
3, A
pre=A
3, P
temp=P
3, P
pre=P
3, wherein, A
tempfor the value of current attenuator, A
prefor the value of the attenuator of last time, P
tempfor current performance number, P
prefor the performance number of last time;
Step H13: calculate P
3the value of-P, if P
3-P < 0, enters step H14; If P
3-P>=0, enters step H16;
Step H14: upgrade P
pre=P
temp, A
pre=A
temp, the value of setting attenuator is A
temp=A
temp-Δ, obtains the output power value P of this frequency
temp;
Step H15: calculate P
tempthe value of-P, if P
temp-P < 0, enters step H14; If P
temp-P>=0, enters step H18;
Step H16: upgrade P
pre=P
temp, A
pre=A
temp, the value of setting attenuator is A
temp=A
temp+ Δ, obtains the output power value P of this frequency
temp;
Step H17: calculate P
tempthe value of-P, if P
temp-P≤0, enters step H18; If P
temp-P > 0, enters step H16;
Step H18: calculate | P
temp|-| P
pre| value, if | P
temp|-| P
pre|≤0, enter step H19; If | P
temp|-| P
pre| > 0, enters step H20;
Step H19: the value A of the attenuator of this frequency optimum
bestfor A
temp, the output power value P of this frequency optimum
bestfor P
temp, enter step H26;
Step H20: the value A of the attenuator of this frequency optimum
bestfor A
pre, the output power value P of this frequency optimum
bestfor P
pre, enter step H26;
Step H21: judge whether | P-P
1|≤σ, if | P-P
1|≤σ, enters step H22; If | P-P
1| > σ, enters step H25;
Step H22: the value A of the attenuator of this frequency optimum
bestfor A
1, the output power value P of this frequency optimum
bestfor P
1, enter step H26;
Step H23: judge whether | P-P
2|≤σ, if | P-P
2|≤σ, enters step H24; If | P-P
2| > σ, enters step H25;
Step H24: the value A of the attenuator of this frequency optimum
bestfor A
2, the output power value P of this frequency optimum
bestfor P
2, enter step H26;
Step H25: calibrate unsuccessfully, request change P or σ;
Step H26: terminate the calibration of current frequency dichotomy.
3. method according to claim 1, is characterized in that: described step P comprises the following steps:
Step P1: start to carry out interpolation calibration to each interval of current frequency range;
Step P2: the initial frequency F that current interval is set
1=F
begin, stop frequency F
2=F
begin+ F
step, timing point N=1 is set;
Step P3: calculate F
2-F
stopvalue, if F
2-F
stop< 0, enters step P5; If F
2-F
stop>=0, enter step P4;
Step P4: upgrade F
2=F
stop;
Step P5: setting current interval initial frequency F
1to stopping frequency F
2the slope K of fitting a straight line of value of attenuator
n[initial value] be 0;
Step P6: calculating K
n=(A
n+1-A
n)/(F
2-F
1), replace initial value 0 by the value calculated;
Step P7: determine F
2whether equal F
stopif, F
2equal F
stop, enter step P10; If F
2be not equal to F
stop, enter step P8;
Step P8: upgrade N=N+1, frequency F is set
temp=F
2;
Step P9: the initial frequency F that current interval is set
1=F
temp, stop frequency F
2=F
temp+ F
step, enter step P3;
Step P10: terminate interpolation calibration.
4. the output power calibration steps in the radio-frequency (RF) excited source based on linear interpolation according to any one of claim 1-3, is characterized in that described peripheral control unit is computing machine.
5. the output power calibration steps in the radio-frequency (RF) excited source based on linear interpolation according to any one of claim 1-3, is characterized in that described connecting line is GPIB cable, USB cable or netting twine.
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| CN201510282147.9A CN105510852A (en) | 2015-05-28 | 2015-05-28 | Output power calibration method of radio frequency excitation source based on linear interpolation |
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