CN108873050A - The digital measuring method and equipment of beam position in a kind of electronic storage ring - Google Patents
The digital measuring method and equipment of beam position in a kind of electronic storage ring Download PDFInfo
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Abstract
The invention discloses the digital measuring method and equipment of beam position in a kind of electronic storage ring, relevant device includes：AFE(analog front end) part and digital processing part；Wherein：AFE(analog front end) part carries out lack sampling to the input signal from beam position detector using Undersampling technique, and controlling sample rate is 4 times of lack sampling output signal frequency, to obtain digital quadrature I, the Q sequence of beam position detector input signal；Signal process part, to digital quadrature I, Q sequence passes through 2 sampling rates of drop, I is obtained multiplied by positive and negative ± 1, two sequences of Q, after two sequences of I, Q reduce data rate by CIC decimation filter and FIR filter alone respectively, the amplitude of beam position detector signal is calculated by CORDIC iterative algorithm unit, and then calculates beam position.Above scheme can realize digital beam position measurement by simple equipment, not only simplify the structure of digital processing algorithm, also reduce the processing pressure and storage pressure of system, meanwhile, also improve measurement accuracy.
Description
Technical field
The present invention relates to a kind of digitlizations of beam position in accelerator beam diagnostics field more particularly to electronic storage ring
Measurement method and equipment.
Background technique
Electronic storage ring be store high-velocity electrons line equipment, be particle physics research and Synchrotron Radiation Study it is important
Equipment.Whether the characteristic of line meets the requirements in storage rings, most important to experimental study.Thus, it would be desirable to beam current measurement
System is monitored and controls to the line in storage rings.
The position of line cross section is an important parameter in electronic storage ring, at present can be with there are many beam detector
For detecting its position.The signal of detector monitors, which needs to handle by electrical signal, can just be collected analysis, commonly
Processing method is orthogonally transformed.The signal of four road BPM detectors passes through the orthogonal sequence obtained after orthogonal transformation, calculates separately
To four signal amplitudes, four road signal amplitudes calculate beam position by the method for difference and ratio.But early stage it is full simulation with
And that there is precision is low for the transformation of modulus hybrid orthogonal, and vulnerable to external interference, the disadvantages of connection is complicated.
Summary of the invention
The object of the present invention is to provide the digital measuring methods and equipment of beam position in a kind of electronic storage ring, can lead to
It crosses simple equipment and realizes digital beam position measurement.
The purpose of the present invention is what is be achieved through the following technical solutions：
The digitized measurement equipment of beam position in a kind of electronic storage ring, including：AFE(analog front end) part and digital processing
Part；Wherein：
AFE(analog front end) part carries out lack sampling to the input signal from beam position detector using Undersampling technique,
And controlling sample rate is 4 times of lack sampling output signal frequency, to obtain the number of beam position detector input signal just
Hand over I, Q sequence；
Signal process part, to digital quadrature I, Q sequence drops 2 samplings after passing through delay and not delay process respectively
Rate obtains I, two sequences of Q multiplied by positive and negative ± 1, and two sequences of I, Q are filtered by CIC decimation filter and FIR alone respectively
After device reduces data rate, the amplitude of beam position detector signal is calculated by CORDIC iterative algorithm unit, and then calculate
Beam position.
The digital measuring method of beam position in a kind of electronic storage ring, is realized based on equipment above-mentioned, this method step
It is rapid as follows：
Lack sampling is carried out to the input signal from beam position detector using Undersampling technique by AFE(analog front end) part,
And controlling sample rate is 4 times of lack sampling output signal frequency, to obtain the number of beam position detector input signal just
Hand over I, Q sequence；
By signal process part to digital quadrature I, Q sequence is adopted by delay respectively and 2 times of drop after not delay process
Sample rate obtains I, two sequences of Q multiplied by positive and negative ± 1, and two sequences of I, Q are filtered by CIC decimation filter and FIR alone respectively
After wave device reduces data rate, the amplitude of beam position detector signal, Jin Erji are calculated by CORDIC iterative algorithm unit
Calculate beam position.
As seen from the above technical solution provided by the invention, it mainly has the following advantages that：1) present invention is by owing
Sampling, and controlling sample rate is 4 times of signal after lack sampling, is directly digitized high-frequency signal, and obtain Beam position monitor
The digital quadrature sequence of device input signal.All signal processings all concentrate on numeric field in equipment, avoid complicated simulation
Treatment process simplifies system structure；Digitized quadrature sequence is directly obtained, the structure of digital processing algorithm is enormously simplified.
2) present invention reduces I by CIC decimation filter and FIR filter, the frequency of Q sequence, alleviate the processing pressure of system with
Store pressure.3) present invention uses cordic algorithm unit iteration, calculates the amplitude of beam position detector input signal,
Cordic algorithm simplifies calculating process, improves precision.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the digitized measurement equipment signal of beam position in a kind of electronic storage ring provided in an embodiment of the present invention
Figure；
Fig. 2 is I provided in an embodiment of the present invention, the structural schematic diagram of Q extracting unit；
Fig. 3 is five ranks cordic algorithm unit iteration structure block diagram provided in an embodiment of the present invention.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
The embodiment of the present invention provides a kind of digitized measurement equipment of beam position in electronic storage ring, as shown in Figure 1, its
Mainly include：AFE(analog front end) part and digital processing part；Wherein：
AFE(analog front end) part carries out lack sampling to the input signal from beam position detector using Undersampling technique,
And controlling sample rate is 4 times of lack sampling output signal frequency, to obtain the number of beam position detector input signal just
Hand over I, Q sequence；
Signal process part, to digital quadrature I, Q sequence drops 2 samplings after passing through delay and not delay process respectively
Rate obtains I, two sequences of Q multiplied by positive and negative ± 1, and two sequences of I, Q are filtered by CIC decimation filter and FIR alone respectively
After device reduces data rate, beam position detector signal amplitude is calculated by CORDIC iterative algorithm unit, and then calculate beam
Flow position.
In order to make it easy to understand, below for AFE(analog front end) part and the concrete composition structure and function of signal process part
Detailed introduction can be done.
One, AFE(analog front end) part
Referring to Figure 1, the AFE(analog front end) part mainly includes：Position sensing signal imitation filter and gain adjustment list
Member, reference signal analog filter and gain adjustment unit, clock generating unit and analog-to-digital conversion unit.
1, the position sensing signal imitation filter and gain adjustment unit, for filtering out line by bandpass filter
The second harmonic ingredient of position sensor input signal, and its amplitude is adjusted to adapt to the range of analog-to-digital conversion unit.
2, the reference signal analog filter and gain adjustment unit, for carrying out band logical filter to the reference signal of input
Wave filters out signal fundamental component and the amplitude of accommodation, is output to clock generating unit.
In the embodiment of the present invention, the position sensing signal imitation filter and gain adjustment unit and reference signal are simulated
Filter and gain adjustment unit are connected and composed by cascade bandpass filter and gain adjustment unit, gain adjustment unit by
Radio frequency amplifier and attenuator interconnected are constituted.
3, clock generating unit, for using reference signal analog filter and the signal of gain adjustment unit output as defeated
Enter clock, meets the clock frequency of analog-to-digital conversion unit sampling rate using the output of numerically controlled phaselocked loop, and be fanned out to
Analog-to-digital conversion unit is as sampling clock.
In the embodiment of the present invention, the clock generating unit provides clock signal, and meeting sample rate is Beam position monitor
4 times of signal after device input signal lack sampling.
It will be understood by those skilled in the art that the relationship between sample rate Fs and signal frequency f is (4n ± 1) Fs=4f/,
The sampling of f/ (4n ± 1) is usually known as lack sampling, thus sample rate is 4 times of signal after lack sampling.
4, analog-to-digital conversion unit, for receiving the output of position detectable signal analog filter and gain adjustment unit
Signal obtains digital quadrature I, the Q sequence of beam position detector input signal by analog-to-digital conversion.
Two, signal process part
Referring to Figure 1, the signal process part mainly includes：I, Q extracting unit, drop data rate unit, amplitude
Computing unit and position calculation unit.
1, I, Q extracting unit lead to for receiving digital quadrature I, the Q sequence (I, Q ,-I ,-Q) of AFE(analog front end) part output
The different delay of two-way is crossed, 2 sampling rates is dropped, obtains I, two sequences of Q multiplied by ± 1.
As shown in Fig. 2, being I, the structural schematic diagram of Q extracting unit, I, Q extracting unit, for receiving AFE(analog front end) part
Digital quadrature I, the Q sequence (I, Q ,-I ,-Q) of output, by dropping 2 samplings after delay is not added respectively, a unit is added to add delay
Rate obtains I ,-I sequence, Q ,-Q sequence, then obtains I, two sequences of Q multiplied by ± 1 respectively.
In the embodiment of the present invention, the alternating is realized multiplied by ± 1 by counter and memory, the counting clock of counter
It is consistent with the frequency of sequence after 2 sampling rates of drop.
2, drop data rate unit, for I, two sequences of Q to extract alone times of setting by CIC decimation filter respectively
Number, obtains required data rate, and inhibit noise by FIR filter.
It will be understood by those skilled in the art that CIC decimation filter extract multiple can according to the actual situation or behaviour
Make the experience of personnel to set, to ensure to obtain suitable data rate after extracting.
3, magnitude computation unit receives the I of drop data rate unit output, two sequences of Q, by several CORDIC iteration
Algorithm unit calculates signal amplitude.
It will be understood by those skilled in the art that consider the accuracy of calculated result and the efficiency of calculating, it can be according to reality
Situation or the experience of operator set appropriate number of CORDIC iterative algorithm unit.
Illustratively, five CORDIC iterative algorithm units can be used and calculate signal amplitude, be five ranks as described in Figure 3
Cordic algorithm unit iteration structure block diagram.
4, position calculation unit utilizes the width for four beam position detector signals that magnitude computation unit is calculated
Degree uses difference and the X than calculating line, Y coordinate position.
It will be understood by those skilled in the art that I, Q sequence can only calculate signal amplitude all the way, that is, a line all the way
The amplitude of position sensor signal；It is generally necessary to which four road beam position detector signal amplitudes calculate the position of line, that is, exist
Difference and than before unit AFE(analog front end) (except clock unit and reference signal unit) and whole four tunnels of needs in digital processing part.
It is apparent to those skilled in the art that for convenience and simplicity of description, only with above-mentioned each function
The division progress of module can according to need and for example, in practical application by above-mentioned function distribution by different function moulds
Block is completed, i.e., the internal structure of equipment is divided into different functional modules, to complete all or part of function described above
Energy.
In above scheme of the embodiment of the present invention, bandpass filter is mainly utilized, extracts the feature letter of detector inductive signal
Number frequency content measures；By Undersampling technique, special sample rate is selected, directly obtains the IQ number of digital medium-frequency signal
According to sequence；Data frequency is reduced to suitable size using decimation filter, facilitates signal processing；Recycle cordic algorithm knot
Structure calculates signal amplitude；Amplitude information is utilized later, and beam position is calculated by difference and the calculation method of ratio.Concrete principle is such as
Under：
1, characteristic frequency components extract
If the repetition rate of radiofrequency signal is f0, then its harmonic frequency is f1(1*f0), f2(2*f0), f3(3*f0) etc..
The present invention extracts the second harmonic of beam position detector output signal as processing signal.It is extracted 2 times by bandpass filter
Harmonic components filter off other harmonic waves and noise.It since the harmonic components amplitude of input signal is smaller, needs to be amplified, with suitable
Answer the range of ADC.
2, the selection of sample frequency
The amplitude of signal can simply be calculated very much using the method for quadrature analysis for sinusoidal signal.Key is to select
Suitable sample rate is taken, orthogonal sequence is obtained.
Since the signal frequency of input is higher, the ADC sample rate that the general method of sampling requires is high, it is difficult to reach, be elected to
When the sample rate selected meets following relationship, the I of frequency input signal, Q orthogonal sequence can be directly obtained.
It might as well carry out the following derivation of equation：One amplitude is A, frequency ω, and phase isSinusoidal signal can be with table
Show：
Digital signal sequences after sampling：
In above formula, k=0,1,2,3 ..., TsFor the sampling period.
3, decimation filter
For the I obtained by sampling, Q ,-I ,-Q ... sequence (digital quadrature I, Q sequence), respectively by the way that delay and one is not added
The processing of a unit delay, then 2 sampling rates drop, I is obtained ,-I ... and Q ,-Q ... two paths of signals；It is stored in ROM in advance again
1, -1,1, -1 ... by with I, the identical timer count of-I ... (or Q,-Q ...) sequence frequency, realize I and-I (or Q with -
Q) alternately multiplied by ± 1, I sequence and Q sequence are obtained.
4, signal amplitude calculates
Signal amplitude calculation basis cordic algorithm, by five iteration, the available higher signal amplitude of precision, and
And greatly simplify calculating structure.
5, position calculating method
According to the range value of four road beam position detector signals, utilize " difference and ratio " method that can calculate beam position
X, Y coordinate.
Another embodiment of the present invention also provides a kind of digital measuring method of beam position in electronic storage ring, is based on
Equipment described in previous embodiment realizes that this method key step is as follows：
Lack sampling is carried out to the input signal from beam position detector using Undersampling technique by AFE(analog front end) part,
And controlling sample rate is 4 times of lack sampling output signal frequency, to obtain the number of beam position detector input signal just
Hand over I, Q sequence；
By signal process part to digital quadrature I, Q sequence passes through delay respectively and adopts with 2 times of drop after not delay process
Sample rate obtains I, two sequences of Q multiplied by positive and negative ± 1, and two sequences of I, Q are filtered by CIC decimation filter and FIR alone respectively
After wave device reduces data rate, the amplitude of beam position detector signal, Jin Erji are calculated by CORDIC iterative algorithm unit
Calculate beam position.
It should be noted that the composed structure of AFE(analog front end) part and signal process part involved in the above method
And had a detailed description in the embodiment of function in front, therefore repeat no more herein.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (8)
1. the digitized measurement equipment of beam position in a kind of electronic storage ring, which is characterized in that including：AFE(analog front end) part and
Digital processing part；Wherein：
AFE(analog front end) part carries out lack sampling to the input signal from beam position detector using Undersampling technique, and controls
Sample rate processed is 4 times of lack sampling output signal frequency, to obtain the digital quadrature I, Q of beam position detector input signal
Sequence；
Signal process part, to digital quadrature I, Q sequence drops 2 sampling rates after passing through delay and not delay process respectively,
I, two sequences of Q are obtained multiplied by positive and negative ± 1, two sequences of I, Q pass through alone CIC decimation filter and FIR filter respectively
After reducing data rate, the amplitude of beam position detector signal is calculated by CORDIC iterative algorithm unit, and then calculate beam
Flow position.
2. the digitized measurement equipment of beam position in a kind of electronic storage ring according to claim 1, which is characterized in that
The AFE(analog front end) part includes：Position sensing signal imitation filter and gain adjustment unit, reference signal analog filter
And gain adjustment unit, clock generating unit and analog-to-digital conversion unit；Wherein：
The position sensing signal imitation filter and gain adjustment unit are visited for filtering out beam position by bandpass filter
The second harmonic ingredient of device input signal is surveyed, and adjusts its amplitude to adapt to the range of analog-to-digital conversion unit；
The reference signal analog filter and gain adjustment unit, for carrying out bandpass filtering, filter to the reference signal of input
Signal fundamental component and the amplitude of accommodation out, are output to clock generating unit；
Clock generating unit, for using reference signal analog filter and the signal of gain adjustment unit output as when input
Clock meets the clock frequency of analog-to-digital conversion unit sampling rate using the output of numerically controlled phaselocked loop, and is fanned out to simulation
Digital conversion unit is as sampling clock；
Analog-to-digital conversion unit, for receiving position detectable signal analog filter and gain adjustment unit and reference signal mould
The output signal of quasi- filter and gain adjustment unit obtains beam position detector input signal by analog-to-digital conversion
Digital quadrature I, Q sequence.
3. the digitized measurement equipment of beam position in a kind of electronic storage ring according to claim 2, which is characterized in that
The position sensing signal imitation filter and gain adjustment unit and reference signal analog filter and gain adjustment unit are equal
Connected and composed by cascade bandpass filter and gain adjustment unit, gain adjustment unit by radio frequency amplifier interconnected and
Attenuator is constituted.
4. the digitized measurement equipment of beam position in a kind of electronic storage ring according to claim 2, which is characterized in that
The clock generating unit provides clock signal, and meeting sample rate is signal after beam position detector input signal lack sampling
4 times.
5. the digitized measurement equipment of beam position in a kind of electronic storage ring according to claim 1, which is characterized in that
The signal process part includes：I, Q extracting unit, drop data rate unit, magnitude computation unit and position calculate single
Member, wherein：
I, Q extracting unit pass through difference for receiving digital quadrature I, the Q sequence (I, Q ,-I ,-Q) of AFE(analog front end) part output
Be not added delay plus a unit add delay after drop 2 sampling rates and obtain I ,-I sequence, Q ,-Q sequence, then obtained respectively multiplied by ± 1
Two sequences of I, Q；
Drop data rate unit, for I, two sequences of Q to be obtained by the multiple that CIC decimation filter extracts setting alone respectively
Required data rate, and noise is inhibited by FIR filter；
Magnitude computation unit receives the I of drop data rate unit output, two sequences of Q, by several CORDIC iterative algorithm lists
Member calculates signal amplitude；
Position calculation unit, using the amplitude for the beam position detector signal that magnitude computation unit is calculated, using difference and
Than the X for calculating line, Y coordinate position.
6. the digitized measurement equipment of beam position in a kind of electronic storage ring according to claim 5, which is characterized in that
Digital quadrature I, the Q sequence received is divided into two-way serial number by the I, Q extracting unit, i.e., is all the way I sequence, another way Q
Sequence；After doing different delays to this two-way serial number, 2 sampling rates are dropped respectively, then alternately obtain I multiplied by ± 1 respectively, Q two
Sequence.
7. the digitized measurement equipment of beam position in a kind of electronic storage ring according to claim 6, which is characterized in that
The alternating passes through counter and memory realization, counting clock and the sequence after 2 sampling rates of drop of counter multiplied by ± 1
Frequency is consistent.
8. the digital measuring method of beam position in a kind of electronic storage ring, which is characterized in that any based on claim 1-7
Equipment described in realizes that the method steps are as follows：
Lack sampling is carried out to the input signal from beam position detector using Undersampling technique by AFE(analog front end) part, and is controlled
Sample rate processed is 4 times of lack sampling output signal frequency, to obtain the digital quadrature I, Q of beam position detector input signal
Sequence；
By signal process part to digital quadrature I, Q sequence drops 2 sampling rates after delay process by delay respectively and not,
I, two sequences of Q are obtained multiplied by positive and negative ± 1, two sequences of I, Q pass through alone CIC decimation filter and FIR filter respectively
After reducing data rate, the amplitude of beam position detector signal is calculated by CORDIC iterative algorithm unit, and then calculate beam
Flow position.
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| CN115080470A (en) * | 2022-06-27 | 2022-09-20 | 中国科学技术大学 | Beam-group-by-beam-group multi-data synchronization method based on pattern detector and electronic equipment |
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