CN107786287A - A kind of flatness calibration method and system - Google Patents
A kind of flatness calibration method and system Download PDFInfo
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- CN107786287A CN107786287A CN201610799132.4A CN201610799132A CN107786287A CN 107786287 A CN107786287 A CN 107786287A CN 201610799132 A CN201610799132 A CN 201610799132A CN 107786287 A CN107786287 A CN 107786287A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
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- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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- H—ELECTRICITY
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Abstract
The invention provides a kind of flatness calibration method and system, wherein, methods described includes：Obtain radio-frequency channel frequency domain characteristic measurement data linear value；According to the radio-frequency channel frequency domain characteristic measurement data linear value, fitting obtains the frequency domain response of full bandwidth；The frequency domain response of wave filter is determined according to the frequency domain response of the full bandwidth；The time-domain coefficients of the wave filter are calculated according to the frequency domain response of the wave filter；According to the coefficient length of the wave filter, the data intercept from the time-domain coefficients of the wave filter, obtained data will be intercepted it is defined as the coefficient of the wave filter；The wave filter is configured according to the coefficient of the wave filter, flatness calibration is carried out with the data collected to analog-digital converter.By the way that the present invention solves the problems, such as very flexible existing for existing flatness calibration program, workload is big, operating load is high.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of flatness calibration method and system.
Background technology
In order to improve communication quality, it will usually carry out flatness calibration, at present, the flatness of generally use to receiving power
Calibration method is as follows：Single-point calibration is carried out to each frequency using RF compensation or digital compensation mode, to improve flatness：First
The flatness characteristic of receiver is calibrated, measurement draws the frequency domain characteristic of receiver, and redesign wave filter is reversely mended
Repay, improved output result flatness.
However, existing flatness calibration method is usually applicable only to a certain fixed frequency range and the little link of change in gain
System, this general reception signal of chain-circuit system is relatively simple, and the dynamic range of frequency meter gain is little.For needing to measure frequency
Duan Guang, the big scene of Power Dynamic Range (e.g., comprehensive test instrument), existing flatness calibration method can not be then applicable：Digital compensation
If the frequency band of compensation is wide or higher to flatness requirement, the length and bit wide of filter coefficient will be greatly increased, significantly
Increase the computational load of processor.
The content of the invention
The present invention provides a kind of flatness calibration method and system, clever existing for existing flatness calibration program to solve
The problem of poor activity, workload are big, operating load is high.
In order to solve the above problems, the invention discloses a kind of flatness calibration method, including：
Obtain radio-frequency channel frequency domain characteristic measurement data linear value；
According to the radio-frequency channel frequency domain characteristic measurement data linear value, fitting obtains the frequency domain response of full bandwidth；
The frequency domain response of wave filter is determined according to the frequency domain response of the full bandwidth；
The time-domain coefficients of the wave filter are calculated according to the frequency domain response of the wave filter；
According to the coefficient length of the wave filter, the data intercept from the time-domain coefficients of the wave filter, interception is obtained
Data be defined as the coefficient of the wave filter；
The wave filter is configured according to the coefficient of the wave filter, to be put down to the data that analog-digital converter collects
Smooth degree calibration.
The invention also discloses a kind of flatness calibration system, including：
Acquisition module, for obtaining radio-frequency channel frequency domain characteristic measurement data linear value；
Fitting module, for obtaining full bandwidth according to the radio-frequency channel frequency domain characteristic measurement data linear value, fitting
Frequency domain response；
First determining module, for determining the frequency domain response of wave filter according to the frequency domain response of the full bandwidth；
Computing module, for the time-domain coefficients of the wave filter to be calculated according to the frequency domain response of the wave filter；
Coefficient acquisition module, for the coefficient length according to the wave filter, cut from the time-domain coefficients of the wave filter
Access evidence, the data that interception obtains are defined as to the coefficient of the wave filter；
Configuration module, for configuring the wave filter according to the coefficient of the wave filter, to be gathered to analog-digital converter
The data arrived carry out flatness calibration.
Compared with prior art, the present invention includes advantages below：
The invention discloses a kind of flatness calibration method：Obtain radio-frequency channel frequency domain characteristic measurement data linear value；Root
According to the radio-frequency channel frequency domain characteristic measurement data linear value, fitting obtains the frequency domain response of full bandwidth；According to the full bandwidth
Frequency domain response determine the frequency domain response of wave filter；According to the frequency domain response of the wave filter be calculated the wave filter when
Domain coefficient；According to the coefficient length of the wave filter, the data intercept from the time-domain coefficients of the wave filter, it will intercept what is obtained
Data are defined as the coefficient of the wave filter；The wave filter is configured according to the coefficient of the wave filter, with to analog-digital converter
The data collected carry out flatness calibration.It can be seen that in the present invention, whole frequency range is determined by the way of linear fit
Frequency response, saved prover time.Secondly, wave filter can be configured according to the coefficient for stating wave filter of determination, so that
Wave filter meets the needs of different measurement standards, reduces filtering time, improves calibration efficiency.
Brief description of the drawings
Fig. 1 is a kind of step flow chart of flatness calibration method in the embodiment of the present invention one；
Fig. 2 is a kind of step flow chart of flatness calibration method in the embodiment of the present invention two；
Fig. 3 is a kind of radio-frequency channel 100MHz frequency domain measurements result exemplary plot in the embodiment of the present invention three；
Fig. 4 is that a kind of radio-frequency channel [122.88 245.76] MHz frequency domain response fitting results show in the embodiment of the present invention three
Illustration；
Fig. 5 is a kind of radio-frequency channel [0 245.76] MHz frequency domain response fitting result exemplary plots in the embodiment of the present invention three；
Fig. 6 is a kind of radio-frequency channel filter frequency domain response results exemplary plot in the embodiment of the present invention three；
Fig. 7 is a kind of structured flowchart of flatness calibration system in the embodiment of the present invention four；
Fig. 8 is a kind of structured flowchart of preferable flatness calibration system in the embodiment of the present invention four.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is further detailed explanation.
Embodiment one
Reference picture 1, show a kind of step flow chart of flatness calibration method in the embodiment of the present invention one.In this implementation
In example, the flatness calibration method includes：
Step 102, radio-frequency channel frequency domain characteristic measurement data linear value is obtained.
In the present embodiment, the receiving power of radio-frequency channel can be normalized, obtains the radio-frequency channel
Frequency domain characteristic measurement data linear value.Wherein it is possible to but it is not limited only to be normalized with the center frequency point of determination.
Step 104, according to the radio-frequency channel frequency domain characteristic measurement data linear value, the frequency domain that fitting obtains full bandwidth rings
Should.
In the present embodiment, can with but be not limited only to according to the radio-frequency channel frequency domain characteristic measurement data linear value, lead to
The mode for crossing linear fit obtains the frequency domain response of whole bandwidth.
Step 106, the frequency domain response of wave filter is determined according to the frequency domain response of the full bandwidth.
In the present embodiment, can be rung the inverse of the frequency domain response of the full bandwidth as the frequency domain of the wave filter
Should.
Step 108, the time-domain coefficients of the wave filter are calculated according to the frequency domain response of the wave filter.
In the present embodiment, the time domain system according to corresponding to being further calculated the frequency domain response of the wave filter
Number.
Step 110, according to the coefficient length of the wave filter, the data intercept from the time-domain coefficients of the wave filter will
Intercept the coefficient that obtained data are defined as the wave filter.
In the present embodiment, it is contemplated that the coefficient length of practical application median filter, can be cut from the time-domain coefficients
Take coefficient of the appropriate value as the wave filter.
Step 112, the wave filter is configured according to the coefficient of the wave filter, with the number collected to analog-digital converter
According to progress flatness calibration.
In the present embodiment, the data that analog-digital converter collects first can be after reconfiguring wave filter, pass through
After wave filter, because the frequency domain response of the wave filter after being reconfigured according to the coefficient of the wave filter is radio-frequency channel frequency domain response
Inverse, so receiving power is all flat in whole bandwidth.
In summary, a kind of flatness calibration method described in the present embodiment, can first obtain radio-frequency channel frequency domain characteristic
Measurement data linear value；Then, the frequency of full bandwidth is obtained according to the radio-frequency channel frequency domain characteristic measurement data linear value, fitting
Domain response；The frequency domain response of wave filter is determined further according to the frequency domain response of the full bandwidth；Further according to the frequency domain of the wave filter
The time-domain coefficients of the wave filter are calculated in response；Further according to the coefficient length of the wave filter, from the wave filter when
Data intercept in domain coefficient, the data that interception obtains are defined as to the coefficient of the wave filter；Finally, according to the wave filter
Coefficient configures the wave filter, and flatness calibration is carried out with the data collected to analog-digital converter.It can be seen that in the present embodiment
In, the frequency response of whole frequency range is determined by the way of property fitting, has saved prover time.Secondly, can be according to determination
The coefficient of stating wave filter configure wave filter so that wave filter meets the needs of different measurement standards, reduce filtering time,
Improve calibration efficiency.
Flatness calibration method calibrating mode described in the present embodiment is more flexible, and frequency range and gain are reasonably torn open
Divide, the operand of processor is effectively reduced while flatness filtering performance is improved；Shortening, which is known clearly, to be obtained needed for calibration factor
Time, and maintain higher calibration accuracy.
Embodiment two
Reference picture 2, show a kind of step flow chart of flatness calibration method in the embodiment of the present invention two.In this implementation
In example, the flatness calibration method includes：
Step 202, radio-frequency channel frequency domain characteristic measurement data linear value is obtained.
In the present embodiment, local oscillator can be fixed according to the actual bandwidth of receiving channel, determines local oscillator number and each this
Gain number under shaking., can be according to local oscillator number, gain when obtaining radio-frequency channel frequency domain characteristic measurement data linear value
Measurement point number under number and each gain, obtains multiple point datas on the frequency domain of radio-frequency channel；Then, according to the point data
Determine the radio-frequency channel frequency domain characteristic measurement data linear value.Wherein, the measurement point number under each gain can root
Determined according to sweep interval.
Step 204, according to the radio-frequency channel frequency domain characteristic measurement data linear value, the frequency domain that fitting obtains full bandwidth rings
Should.
In the present embodiment, calculating upper limit frequency range and each self-corresponding first-order linear fitting of lower limit frequency range can first be distinguished
Value；Then, first-order linear is fitted according to corresponding to the radio-frequency channel frequency domain characteristic measurement data linear value, the upper limit frequency range
First-order linear match value corresponding to value and the lower limit frequency range, obtains the frequency domain response in setting frequency range, based on upper limit frequency
Section and each self-corresponding first-order linear match value of lower limit frequency range are by the frequency domain response completion in the setting frequency range；Further,
It can be fitted to obtain the frequency domain response of full bandwidth according to the frequency domain response in the setting frequency range.
Step 206, the frequency domain response of wave filter is determined according to the frequency domain response of the full bandwidth.
In the present embodiment, can be rung the inverse of the frequency domain response of the full bandwidth as the frequency domain of the wave filter
Should.
Step 208, the time-domain coefficients of the wave filter are calculated according to the frequency domain response of the wave filter.
Step 210, according to the coefficient length of the wave filter, the data intercept from the time-domain coefficients of the wave filter will
Intercept the coefficient that obtained data are defined as the wave filter.
Step 212, the wave filter is configured according to the coefficient of the wave filter, with the number collected to analog-digital converter
According to progress flatness calibration.
Step 214, it is determined that the yield value of current frequency；And according to the yield value of the current frequency, line loss value, reception
Channel gain value, the yield value of field programmable gate array determine overall gain value；And according to the overall gain value to mould
The data that number converter collects carry out gain compensation.
In the present embodiment, the current frequency is other frequencies in addition to center frequency point.During due to calculating time-domain coefficients,
Frequency domain data is normalized with center frequency point, so for center frequency point, the gain of wave filter is 0dB, but to it
For his frequency (e.g., the current frequency), wave filter can produce certain gain, and (yield value is the test knot of other frequencies
Fruit and the difference of center frequency point).In order to compensate this error, when gain configures, it is necessary to consider this yield value:According to described
Yield value, line loss value, receiving channel yield value, the yield value of field programmable gate array of current frequency determine overall gain
Value, then, the data collected according to the overall gain value to analog-digital converter carry out gain compensation.
In summary, a kind of flatness calibration method described in the present embodiment, can first obtain radio-frequency channel frequency domain characteristic
Measurement data linear value；Then, the frequency of full bandwidth is obtained according to the radio-frequency channel frequency domain characteristic measurement data linear value, fitting
Domain response；The frequency domain response of wave filter is determined further according to the frequency domain response of the full bandwidth；Further according to the frequency domain of the wave filter
The time-domain coefficients of the wave filter are calculated in response；Further according to the coefficient length of the wave filter, from the wave filter when
Data intercept in domain coefficient, the data that interception obtains are defined as to the coefficient of the wave filter；Finally, according to the wave filter
Coefficient configures the wave filter, and flatness calibration is carried out with the data collected to analog-digital converter.It can be seen that in the present embodiment
In, the frequency response of whole frequency range is determined by the way of property fitting, has saved prover time.Secondly, can be according to determination
The coefficient of stating wave filter configure wave filter so that wave filter meets the needs of different measurement standards, reduce filtering time,
Improve calibration efficiency.
Flatness calibration method calibrating mode described in the present embodiment is more flexible, and frequency range and gain are reasonably torn open
Divide, the operand of processor is effectively reduced while flatness filtering performance is improved；Shortening, which is known clearly, to be obtained needed for calibration factor
Time, and maintain higher calibration accuracy.
Embodiment three
With reference to above-described embodiment, the present embodiment to the flatness of intermediate-frequency band exemplified by calibrating to the flatness calibration side
Method is described in detail.In the present embodiment, the idiographic flow of the smooth degree calibration method can be as follows：
S31, obtain radio-frequency channel frequency domain characteristic measurement data linear value.
In this example, it is assumed that the design bandwidth of comprehensive test instrument receiving channel is 100MHz, then local oscillator can be fixed first,
Flatness in 100MHz bandwidth is tested, test obtains a curve.Specifically, comprehensive test instrument shares 53 local oscillators at present,
Also had any different in view of the flatness of different gains, current gain number be 82, if all tested, test period compared with
It is long, to save the time, in the present embodiment, 82 gains are divided into 11 groups, every group is selected a gain to be tested, its in group
His gain uses the test curve of this gain.Every curve can be tested according to 2MHz sweep interval, due to total band
A width of 100MHz, therefore, it can finally obtain 51 point datas.So on frequency domain, the point datas of 53X 11X 51 can be obtained, according to described
The point datas of 53X 11X 51 can determine the radio-frequency channel frequency domain characteristic measurement data linear value.
For example, the value after 184MHz power normalization can be as follows：
Wherein, NfoRepresent local oscillator number；NreflevelRepresent the gain number under each local oscillator；Δ f represents sweep interval,
Unit is MHz.Such as Fig. 3, a kind of radio-frequency channel 100MHz frequency domain measurements result exemplary plot in the embodiment of the present invention three is shown.
Step S32, linear fit obtain the frequency domain response of full bandwidth.
In the present embodiment, a kind of mode for the frequency domain response for obtaining full bandwidth can be as follows：
The first step, calculateFrequency domain response in frequency range
Specific calculation process is as follows：
To fn(i) first-order linear fitting is carried out, obtains multinomial：Y=a0+x*a1；Wherein,
Solve：
CalculateFrequency domain response in frequency range：
Second step, calculateFrequency domain response in frequency range
Specific calculation process is as follows：
To fn(i) first-order linear fitting is carried out, obtains multinomial：Y=a0+x*a1。
Wherein,
Solve：
CalculateFrequency domain response in frequency range：
3rd step, it is determined thatFrequency domain response in frequency range
Idiographic flow is as follows：
By fn(i)、Merge：
Such as Fig. 4, show that a kind of radio-frequency channel [122.88 245.76] MHz frequency domain responses are intended in the embodiment of the present invention three
Close result exemplary plot.
4th step, according toObtain the frequency domain response of full bandwidth
Such as Fig. 5, a kind of radio-frequency channel [0 245.76] MHz frequency domain response fitting results in the embodiment of the present invention three are shown
Exemplary plot.
Step S33, the frequency domain response of wave filter is calculated
Such as Fig. 6, a kind of radio-frequency channel filter frequency domain response results exemplary plot in inventive embodiments three is shown.
Step S34, calculate the time-domain coefficients h of wave filtern(i)：
Wherein,It is the length of filter coefficient.
Step S35, actually realize the coefficient length used for 2Nc+ 1, then the filter coefficient h finally preservedn′(i)
For：
Wherein, NcCan be any number determined according to actual conditions, the present embodiment is not restricted to this.
Step S36, configure overall gain.
When in the present embodiment, due to calculating time-domain coefficients, frequency domain data is normalized with center frequency point, so
For center frequency point, the gain of wave filter is 0dB, but for other frequencies, wave filter can produce certain gain, be designated as G_
Filter (yield value is the test result of the point and the difference of center frequency point).In order to compensate this error, when gain configures, need
To consider this yield value.As following formula configure overall gain be：
G_total=G_line+G_rx+G_agc+G_filter
G_line is line loss, can be obtained from line.dat files, and G_rx is receiving channel gain, can be from rx.dat
Read in file, G_agc is dispensing FPGA's (Field Programmable Gate Array, field programmable gate array)
Yield value.When reading G_filter values, it should be noted that the storage order of 51 frequency coefficients is [LO+184+50, LO+184-50]
(low local oscillator), [LO-184+50, LO-184-50] (high local oscillator), does not have respective frequencies value, takes closest to two the linear of value and inserts
Value；Wherein LO is the center frequency point of different frequency range, and computational methods are first, G_line values to be read according to current frequency, for G_
Filter selection, since it is known that local oscillator and frequency, while set frequency is probably the interpolation of stored frequency, so first
First it needs to be determined that two frequency bins nearest from current frequency, 11X2 gain corresponding to the two frequencies is then listed, and from
One that minimum is searched in this 22 gains, using this value as initial G_filter, then according to G_total-G_line-G_
Filter obtains G_rx, and corresponding LINKID is found from rx.dat files, then searches G_ according to frequency and LINKID
Filter values, G_agc=G_total-G_rx_-G_line-G_filter are finally calculated, and dispensing FPGA, FPGA realize filtering
Device come to receive data compensate.
In summary, a kind of flatness calibration method described in the present embodiment, can first obtain radio-frequency channel frequency domain characteristic
Measurement data linear value；Then, the frequency of full bandwidth is obtained according to the radio-frequency channel frequency domain characteristic measurement data linear value, fitting
Domain response；The frequency domain response of wave filter is determined further according to the frequency domain response of the full bandwidth；Further according to the frequency domain of the wave filter
The time-domain coefficients of the wave filter are calculated in response；Further according to the coefficient length of the wave filter, from the wave filter when
Data intercept in domain coefficient, the data that interception obtains are defined as to the coefficient of the wave filter；Finally, according to the wave filter
Coefficient configures the wave filter, and flatness calibration is carried out with the data collected to analog-digital converter.It can be seen that in the present embodiment
In, the frequency response of whole frequency range is determined by the way of property fitting, has saved prover time.Secondly, can be according to determination
The coefficient of stating wave filter configure wave filter so that wave filter meets the needs of different measurement standards, reduce filtering time,
Improve calibration efficiency.
Flatness calibration method calibrating mode described in the present embodiment is more flexible, and frequency range and gain are reasonably torn open
Divide, the operand of processor is effectively reduced while flatness filtering performance is improved；Shortening, which is known clearly, to be obtained needed for calibration factor
Time, and maintain higher calibration accuracy.
It should be noted that for foregoing embodiment of the method, in order to be briefly described, therefore it is all expressed as a series of
Combination of actions, but those skilled in the art should know, the present invention is not limited by described sequence of movement, because according to
According to the present invention, some steps can use other orders or carry out simultaneously.Secondly, those skilled in the art should also know,
Embodiment described in this description belongs to preferred embodiment, and involved action is not necessarily essential to the invention.
Example IV
Based on the same inventive concept of above method embodiment, reference picture 7, show in the embodiment of the present invention four a kind of flat
The structured flowchart of smooth degree calibration system.In the present embodiment, the flatness calibration system includes：
Acquisition module 402, for obtaining radio-frequency channel frequency domain characteristic measurement data linear value.
Fitting module 404, for obtaining full bandwidth according to the radio-frequency channel frequency domain characteristic measurement data linear value, fitting
Frequency domain response.
First determining module 406, for determining the frequency domain response of wave filter according to the frequency domain response of the full bandwidth.
Computing module 408, for the time-domain coefficients of the wave filter to be calculated according to the frequency domain response of the wave filter.
Coefficient acquisition module 410, for the coefficient length according to the wave filter, from the time-domain coefficients of the wave filter
Data intercept, the data that interception obtains are defined as to the coefficient of the wave filter.
Configuration module 412, for configuring the wave filter according to the coefficient of the wave filter, to be gathered to analog-digital converter
Obtained data carry out flatness calibration.
It can be seen that in the present embodiment, the frequency response of whole frequency range is determined by the way of property fitting, has saved calibration
Time.Secondly, wave filter can be configured according to the coefficient for stating wave filter of determination, so that wave filter meets different measurement standards
Demand, reduce filtering time, improve calibration efficiency.
Flatness calibration system calibrating mode described in the present embodiment is more flexible, and frequency range and gain are reasonably torn open
Divide, the operand of processor is effectively reduced while flatness filtering performance is improved；Shortening, which is known clearly, to be obtained needed for calibration factor
Time, and maintain higher calibration accuracy.
In a preferred scheme of the present embodiment, reference picture 8, show a kind of preferable flat in the embodiment of the present invention four
Spend the structured flowchart of calibration system.
Preferably, the acquisition module 402 can specifically include：Acquisition submodule 4022, for according to local oscillator number, increasing
Measurement point number under beneficial number and each gain, obtain multiple point datas on the frequency domain of radio-frequency channel；Determination sub-module 4024,
For determining the radio-frequency channel frequency domain characteristic measurement data linear value according to the point data.It is it is further preferred that described flat
Smooth degree calibration system can also include：Second determining module 414, for determining the measurement point under each gain according to sweep interval
Number.
Preferably, the fitting module 404 can specifically include：Calculating sub module 4042, for distinguishing calculating upper limit frequency
Section and each self-corresponding first-order linear match value of lower limit frequency range；First fitting submodule 4044, for according to the radio-frequency channel
One corresponding to first-order linear match value corresponding to frequency domain characteristic measurement data linear value, the upper limit frequency range and the lower limit frequency range
Rank linear fit value, obtain the frequency domain response in setting frequency range；Second fitting submodule 4046, for according to the setting frequency range
Interior frequency domain response is fitted to obtain the frequency domain response of full bandwidth.
Preferably, first determining module 406, specifically can be used for making the inverse of the frequency domain response of the full bandwidth
For the frequency domain response of the wave filter.
Preferably, the flatness calibration system can also include：
Yield value determining module 416, for determining the yield value of current frequency；Wherein, the current frequency is except center
Other frequencies outside frequency.
Overall gain value determining module 418, for the yield value according to the current frequency, line loss value, receiving channel gain
Value, the yield value of field programmable gate array determine overall gain value.
Compensating module 420, the data for being collected according to the overall gain value to analog-digital converter carry out gain benefit
Repay.
In summary, a kind of flatness calibration system described in the present embodiment, can first obtain radio-frequency channel frequency domain characteristic
Measurement data linear value；Then, the frequency of full bandwidth is obtained according to the radio-frequency channel frequency domain characteristic measurement data linear value, fitting
Domain response；The frequency domain response of wave filter is determined further according to the frequency domain response of the full bandwidth；Further according to the frequency domain of the wave filter
The time-domain coefficients of the wave filter are calculated in response；Further according to the coefficient length of the wave filter, from the wave filter when
Data intercept in domain coefficient, the data that interception obtains are defined as to the coefficient of the wave filter；Finally, according to the wave filter
Coefficient configures the wave filter, and flatness calibration is carried out with the data collected to analog-digital converter.It can be seen that in the present embodiment
In, the frequency response of whole frequency range is determined by the way of property fitting, has saved prover time.Secondly, can be according to determination
The coefficient of stating wave filter configure wave filter so that wave filter meets the needs of different measurement standards, reduce filtering time,
Improve calibration efficiency.
Flatness calibration system calibrating mode described in the present embodiment is more flexible, and frequency range and gain are reasonably torn open
Divide, the operand of processor is effectively reduced while flatness filtering performance is improved；Shortening, which is known clearly, to be obtained needed for calibration factor
Time, and maintain higher calibration accuracy.
For device embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, it is related
Part illustrates referring to the part of embodiment of the method.
Each embodiment in this specification is described by the way of progressive, what each embodiment stressed be with
The difference of other embodiment, between each embodiment identical similar part mutually referring to.
A kind of flatness calibration method provided by the present invention and system are described in detail above, it is used herein
Specific case is set forth to the principle and embodiment of the present invention, and the explanation of above example is only intended to help and understands
The method and its core concept of the present invention；Meanwhile for those of ordinary skill in the art, according to the thought of the present invention, having
There will be changes in body embodiment and application, in summary, this specification content should not be construed as to the present invention
Limitation.
Claims (12)
- A kind of 1. flatness calibration method, it is characterised in that including：Obtain radio-frequency channel frequency domain characteristic measurement data linear value；According to the radio-frequency channel frequency domain characteristic measurement data linear value, fitting obtains the frequency domain response of full bandwidth；The frequency domain response of wave filter is determined according to the frequency domain response of the full bandwidth；The time-domain coefficients of the wave filter are calculated according to the frequency domain response of the wave filter；According to the coefficient length of the wave filter, the data intercept from the time-domain coefficients of the wave filter, the number that interception is obtained According to the coefficient for being defined as the wave filter；The wave filter is configured according to the coefficient of the wave filter, flatness is carried out with the data collected to analog-digital converter Calibration.
- 2. according to the method for claim 1, it is characterised in that the acquisition radio-frequency channel frequency domain characteristic measurement data is linear Value, including：According to the measurement point number under local oscillator number, gain number and each gain, multiple points on the frequency domain of radio-frequency channel are obtained Data；The radio-frequency channel frequency domain characteristic measurement data linear value is determined according to the point data.
- 3. according to the method for claim 2, it is characterised in that also include：The measurement point number under each gain is determined according to sweep interval.
- 4. according to the method for claim 1, it is characterised in that described according to the radio-frequency channel frequency domain characteristic measurement data Linear value, fitting obtain the frequency domain response of full bandwidth, including：Calculating upper limit frequency range and each self-corresponding first-order linear match value of lower limit frequency range respectively；According to first-order linear match value corresponding to the radio-frequency channel frequency domain characteristic measurement data linear value, the upper limit frequency range and First-order linear match value corresponding to the lower limit frequency range, obtains the frequency domain response in setting frequency range；It is fitted to obtain the frequency domain response of full bandwidth according to the frequency domain response in the setting frequency range.
- 5. according to the method for claim 1, it is characterised in that described to determine to filter according to the frequency domain response of the full bandwidth The frequency domain response of device, including：Frequency domain response using the inverse of the frequency domain response of the full bandwidth as the wave filter.
- 6. according to the method for claim 1, it is characterised in that also include：It is determined that the yield value of current frequency；Wherein, the current frequency is other frequencies in addition to center frequency point；According to the gain of the yield value, line loss value, receiving channel yield value, field programmable gate array of the current frequency Value determines overall gain value；The data collected according to the overall gain value to analog-digital converter carry out gain compensation.
- A kind of 7. flatness calibration system, it is characterised in that including：Acquisition module, for obtaining radio-frequency channel frequency domain characteristic measurement data linear value；Fitting module, for obtaining the frequency domain of full bandwidth according to the radio-frequency channel frequency domain characteristic measurement data linear value, fitting Response；First determining module, for determining the frequency domain response of wave filter according to the frequency domain response of the full bandwidth；Computing module, for the time-domain coefficients of the wave filter to be calculated according to the frequency domain response of the wave filter；Coefficient acquisition module, for the coefficient length according to the wave filter, number is intercepted from the time-domain coefficients of the wave filter According to obtained data will be intercepted be defined as the coefficient of the wave filter；Configuration module, for configuring the wave filter according to the coefficient of the wave filter, with what is collected to analog-digital converter Data carry out flatness calibration.
- 8. system according to claim 7, it is characterised in that the acquisition module, including：Acquisition submodule, for according to the measurement point number under local oscillator number, gain number and each gain, obtaining radio-frequency channel Multiple point datas on frequency domain；Determination sub-module, for determining the radio-frequency channel frequency domain characteristic measurement data linear value according to the point data.
- 9. system according to claim 8, it is characterised in that also include：Second determining module, for determining the measurement point number under each gain according to sweep interval.
- 10. system according to claim 7, it is characterised in that the fitting module, including：Calculating sub module, for distinguishing calculating upper limit frequency range and each self-corresponding first-order linear match value of lower limit frequency range；First fitting submodule, for according to the radio-frequency channel frequency domain characteristic measurement data linear value, the upper limit frequency range pair First-order linear match value corresponding to the first-order linear match value answered and the lower limit frequency range, the frequency domain obtained in setting frequency range ring Should；Second fitting submodule, for being fitted to obtain the frequency domain response of full bandwidth according to the frequency domain response in the setting frequency range.
- 11. system according to claim 7, it is characterised in that first determining module, for by the full bandwidth Frequency domain response of the inverse of frequency domain response as the wave filter.
- 12. system according to claim 7, it is characterised in that also include：Yield value determining module, for determining the yield value of current frequency；Wherein, the current frequency is in addition to center frequency point Other frequencies；Overall gain value determining module, for the yield value according to the current frequency, line loss value, receiving channel yield value, scene The yield value of programmable gate array determines overall gain value；Compensating module, the data for being collected according to the overall gain value to analog-digital converter carry out gain compensation.
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