CN109164300A - Microwave frequency high precision measuring system and method based on harmonic wave amplification - Google Patents
Microwave frequency high precision measuring system and method based on harmonic wave amplification Download PDFInfo
- Publication number
- CN109164300A CN109164300A CN201811113871.9A CN201811113871A CN109164300A CN 109164300 A CN109164300 A CN 109164300A CN 201811113871 A CN201811113871 A CN 201811113871A CN 109164300 A CN109164300 A CN 109164300A
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- harmonic wave
- harmonic
- microwave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/17—Spectrum analysis; Fourier analysis with optical or acoustical auxiliary devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/12—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into phase shift
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/14—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by heterodyning; by beat-frequency comparison
- G01R23/145—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by heterodyning; by beat-frequency comparison by heterodyning or by beat-frequency comparison with the harmonic of an oscillator
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
- G01R23/167—Spectrum analysis; Fourier analysis using filters with digital filters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention relates to a kind of microwave frequency high precision measuring systems and method based on harmonic wave amplification, the system comprises: harmonic wave amplification unit, microwave signal progress harmonic wave amplification processing is surveyed for treating, generate it is multiple with harmonic wave amplified signal that microwave signal frequency to be measured is basic frequency and export, wherein the frequency of each harmonic wave amplified signal is the positive integer times of base frequency；Signal detection unit is connect with the output port of the harmonic wave amplification unit, for detecting to the harmonic wave amplified signal, realizes the conversion of analog signal to digital signal；Signal processing unit is connect with the output port of the signal detection unit, for carrying out Digital Signal Processing to digitized harmonic wave amplified signal, realizes the high-precision estimation of original signal frequency.The present invention surveys microwave signal progress harmonic wave amplification by treating, then carries out frequency measurement to one or several harmonic components, can be obviously improved the estimated accuracy of original signal frequency, realizes High-Accuracy Frequency estimation.
Description
Technical field
The present invention relates to microwave frequency field of measuring technique more particularly to a kind of microwave frequency based on harmonic wave amplification are high-precision
Spend measuring system and method.
Background technique
The accurate estimation of microwave signal frequency is in the signal processing of the fields such as communication, radar, sonar and electronic countermeasure
One major issue.Current technology method is both for the signal of digital quantization, and end passes through various algorithms after sensing
Carry out the high-precision estimation of signal frequency.Wherein, the methods of the Power estimation based on parameter model, maximum moisture in the soil Power estimation have frequency
The high advantage of resolving power, but for long sequence, operand is big, is unfavorable for handling in real time.And it is based on discrete Fourier transform
(DFT) spectral analysis method can be taken fast fourier transform algorithm (FFT), and realization is bordering on real-time signal processing and frequency
Resolution capability.However the frequency estimation accuracy of FFT depends on the time of measuring length of signal, is limited to practical application scene and sight
End cost is surveyed, time of measuring length cannot arbitrarily extend, thus the frequency resolution based on FFT is limited, generally be only applicable to frequency
The rough estimate of rate.In response to this problem, the method for several promotion frequency estimation accuracies based on FFT is proposed in the prior art.Its
In it is most representative be a kind of precise frequency estimation method based on observation time sequence segment FFT phase differential, carrying out
When the frequency detecting of single frequency point, frequency estimation accuracy can be significantly improved.When using hanning window, for muting
The maximum detection error of single-frequency point, this method can promote nearly three magnitudes compared to the resolution ratio of FFT.
In general, although above-mentioned certain methods have significant effect in terms of promotion signal frequency estimation accuracy,
There are still some inevitable problems.First, above-mentioned algorithm mainly relies on the Digital Signal Processing of rear end to estimate to promote frequency
Precision, therefore often algorithm complex are counted, it is computationally intensive；Second, the signal-to-noise ratio of parametric technique or section FFT method to signal
Sensitivity, when Signal-to-Noise is poor, the often promotion of frequency estimation accuracy is limited；Third, section FFT method are not suitable for narrow
The analysis of band signal, is mainly reflected in, for being equal to or less than the narrow band signal of FFT resolution ratio, this method will be unable to effective district
What sorting measured is narrow band signal or simple signal, thus also just can not accurately estimate the carrier frequency and band of narrow band signal
It is wide；The frequency estimation accuracy of 4th, FFT segmentation method depends significantly on the type of time domain sequences window, thus for inhomogeneity
The signal of type, precise frequency estimation precision be it is non-stable, need automatic adjusument, this also further limits this method
It is more suitable for the measurement of single frequency point.
For this purpose, present invention proposition passes through in order to be further simplified or the performance of service hoisting back end signal Processing Algorithm
In signal detection front end, harmonic wave amplification pretreatment is implemented to signal, the method to promote frequency estimation accuracy.Pass through this side
Method not only increases information content of the signal on frequency domain, and then realizes that the high-precision of frequency is estimated using simple algorithm, and
As a kind of preprocessing means, frequency estimation accuracy can be further promoted in conjunction with existing common frequency algorithm for estimating.
Summary of the invention
It is an object of the invention to solve or optimize at least part technical problem in the prior art, a kind of base is provided
In the microwave frequency high precision measuring system and method for harmonic wave amplification.
First aspect present invention provides a kind of microwave frequency high precision measuring system based on harmonic wave amplification, the system
System includes:
Harmonic wave amplification unit, connect with microwave signal input port, surveys at microwave signal progress harmonic wave amplification for treating
Reason, generation is multiple for the harmonic wave amplified signal of basic frequency and to be exported with microwave signal frequency to be measured, wherein each harmonic wave expands
The frequency of signal is the positive integer times of base frequency；
Signal detection unit is connect with the output port of the harmonic wave amplification unit, for the harmonic wave amplified signal
It is detected, realizes the conversion of analog signal to digital signal；
Signal processing unit is connect with the output port of the signal detection unit, for expanding to digitized harmonic wave
Signal carries out Digital Signal Processing, realizes the high-precision estimation of original signal frequency.
It is optionally, described in the microwave frequency high precision measuring system according to the present invention based on harmonic wave amplification
Signal processing unit includes:
Fast Fourier Transform (FFT) subelement, for carrying out Fast Fourier Transform (FFT) to digitized harmonic wave amplified signal；
Harmonic frequency estimates subelement, estimates for the result based on Fast Fourier Transform (FFT) harmonic frequency；
Fundamental frequency high-precision estimation subelement, carries out high-precision to base frequency for the estimated result based on harmonic frequency and estimates
Meter.
It is optionally, described in the microwave frequency high precision measuring system according to the present invention based on harmonic wave amplification
Harmonic wave amplification unit makes microwave signal to be measured generate multiple harmonic components in area of light by Electro-optical Modulation technology.
It is optionally, described in the microwave frequency high precision measuring system according to the present invention based on harmonic wave amplification
Harmonic wave amplification unit includes:
Light source gives optical frequency com generator for exporting light carrier；
Optical frequency com generator, the microwave signal Electro-optical Modulation to be measured inputted by microwave signal input port generate frequency
Rate interval is equal to the optical frequency com of microwave signal frequency to be measured, and the spectrum distribution of the optical frequency com is that microwave signal to be measured exists
Harmonic wave amplified signal frequency spectrum on light carrier；The optical frequency com generator output light carries harmonic signal；
The signal detection unit includes:
Photodetector, for carrying out photoelectric conversion, light load harmonic signal, which is down-converted to electrical domain, becomes electric harmonic signal；
Analog-digital converter, for by the electric harmonic signal be converted to digital signal and via digital signal output end mouth it is defeated
Out to signal processing unit.
It is optionally, described in the microwave frequency high precision measuring system according to the present invention based on harmonic wave amplification
Optical frequency com generator includes:
Electric power splitter, input terminal are connect with the microwave signal input port, for microwave signal to be measured to be divided into two
Road output；
First electric amplifier, input terminal are connect with the first via output end of electric power splitter, for believing first via microwave
It number amplifies；
Electric phase-shifter, input terminal connects with the second road output end of electric power splitter, be used for the second tunnel microwave signal into
Row phase shift；
Second electric amplifier, input terminal is connect with the output end of electric phase-shifter, for the second tunnel after phase shift
Microwave signal amplifies；
The output end of phase-modulator, input terminal and light source connects, and by amplified first via microwave signal into
Row phase-modulation；
The output end of intensity modulator, input terminal and phase-modulator connects, and passes through amplified second road microwave
Signal carries out intensity modulated output light and carries harmonic signal.
It is optionally, described in the microwave frequency high precision measuring system according to the present invention based on harmonic wave amplification
Optical frequency com generator is single electrooptic modulator, single phase modulator, single intensity modulator, multiple cascades or parallel connection
Phase-modulator and intensity modulator, or the circulation frequency shifter based on acousto-optic modulator or electrooptic modulator.
It is optionally, described in the microwave frequency high precision measuring system according to the present invention based on harmonic wave amplification
Harmonic wave amplification unit is electric harmonic oscillator, for making microwave signal to be measured generate multiple harmonic components in electrical domain.
It is optionally, described in the microwave frequency high precision measuring system according to the present invention based on harmonic wave amplification
Harmonic wave amplification unit includes:
Electric harmonic oscillator, input terminal are connect with microwave signal input port, the microwave signal to be measured for that will input
Harmonic wave amplified signal is generated in electrical domain；
Light source, for exporting light carrier to electrooptic modulator；
Electrooptic modulator is realized for modulating the light carrier inputted by light carrier input port using harmonic wave amplified signal
Up conversion of the electric harmonic wave amplified signal to area of light.
Second aspect of the present invention provides a kind of microwave frequency high-precision measuring method based on harmonic wave amplification, the side
Method includes:
It treats and surveys microwave signal and carry out harmonic wave amplification processing, generating multiple with microwave signal frequency to be measured is basic frequency
Harmonic wave amplified signal simultaneously exports, wherein the frequency of each harmonic wave amplified signal is the positive integer times of base frequency；
The harmonic wave amplified signal is detected, realizes the conversion of analog signal to digital signal；
Digital Signal Processing is carried out to digitized harmonic wave amplified signal, realizes the high-precision estimation of original signal frequency.
It is optionally, described in the microwave frequency high-precision measuring method according to the present invention based on harmonic wave amplification
Carrying out Digital Signal Processing to digitized harmonic wave amplified signal includes:
Fast Fourier Transform (FFT) is carried out to digitized harmonic wave amplified signal；
Result based on Fast Fourier Transform (FFT) estimates harmonic frequency；
High-precision estimation is carried out to base frequency based on the estimated result of harmonic frequency.
Implement the microwave frequency high precision measuring system and method for the invention based on harmonic wave amplification, has below beneficial to effect
Fruit: the present invention surveys microwave signal progress harmonic wave amplification by treating, i.e., generates repetition rate on frequency domain and be equal to original signal frequency
Multiple coincidence frequency component distributings of rate can be obviously improved original by the frequency measurement to one or several harmonic components
The estimated accuracy of beginning signal frequency.
Detailed description of the invention
Fig. 1 is the module frame according to the microwave frequency high precision measuring system based on harmonic wave amplification of the embodiment of the present invention one
Figure；
Fig. 2 is the basic schematic diagram of the microwave frequency high precision measuring system according to the present invention based on harmonic wave amplification；
The margin of error distribution of Fig. 3 original frequency measured value and the margin of error of 10th harmonic wave AVHRR NDVI value are distributed；
The statistical average result of the multiple harmonic wave AVHRR NDVI value margins of error of Fig. 4；
Fig. 5 is that harmonic wave expands in the microwave frequency high precision measuring system based on harmonic wave amplification according to the embodiment of the present invention two
Increase the structural block diagram of unit；
Fig. 6 is that signal is visited in the microwave frequency high precision measuring system based on harmonic wave amplification according to the embodiment of the present invention two
Survey the structural block diagram of the first embodiment of unit；
Fig. 7 is that signal is visited in the microwave frequency high precision measuring system based on harmonic wave amplification according to the embodiment of the present invention two
Survey the structural block diagram of the second embodiment of unit；
Fig. 8 is that harmonic wave expands in the microwave frequency high precision measuring system based on harmonic wave amplification according to the embodiment of the present invention three
Increase the structural block diagram of unit；
Fig. 9 is that harmonic wave expands in the microwave frequency high precision measuring system based on harmonic wave amplification according to the embodiment of the present invention four
Increase the structural block diagram of unit；
Figure 10 is the microwave frequency high-precision measuring method flow chart expanded according to the preferred embodiment of the present invention based on harmonic wave.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below, in order to make mesh of the invention
, technical solution and advantage be more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is further retouched in detail
It states.It should be understood that specific embodiment described herein is only configured to explain the present invention, it is not configured as limiting the present invention.
To those skilled in the art, the present invention can be real in the case where not needing some details in these details
It applies.Below the description of embodiment is used for the purpose of better understanding the present invention to provide by showing example of the invention.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence " including ... ", it is not excluded that including
There is also other identical elements in the process, method, article or equipment of the element.
Embodiment one
Referring to Fig. 1, for according to the microwave frequency high precision measuring system based on harmonic wave amplification of the embodiment of the present invention one
Module frame chart.As shown in Figure 1, the microwave frequency high precision measuring system based on harmonic wave amplification that the embodiment of the present invention one provides
It includes at least:
Harmonic wave amplification unit 100 is connect with microwave signal input port 1, for received to microwave signal input port 1
Microwave signal to be measured carries out harmonic wave amplification processing, generates multiple harmonic waves with microwave signal frequency to be measured for basic frequency and expands letter
Number and export, wherein the frequency of each harmonic wave amplified signal is the positive integer times of base frequency.When necessary, it is inputted in microwave signal
Primary signal pretreatment unit can be increased between port 1 and harmonic wave amplification unit 200, to be located in advance to input signal
The processing means such as reason, including signal amplification, filtering need the processing of signal with being conducive to links in system following link
It asks.
Signal detection unit 200 is connect with the output port of harmonic wave amplification unit 100, is believed for expanding to the harmonic wave
It number is detected, realizes the conversion of analog signal to digital signal.Preferably, which can also include down coversion, filter
The treatment processes such as wave.When necessary, can to add secondary signal between harmonic wave amplification unit 100 and signal detection unit 200 pre-
Processing unit, being pre-processed to harmonic wave amplified signal, including the processing such as signal amplification, filtering, amplitude/phase regulation
Means, to be conducive in system following link links to the process demand of signal.
Signal processing unit 300 is connect with the output port of signal detection unit 200, for expanding digitized harmonic wave
Increase signal and carry out Digital Signal Processing, realizes the high-precision estimation of original signal frequency.The signal processing unit 300 can also be held
The signal processings such as row Digital Down Convert, digital filtering.Signal processing unit 300 is connect with information output mouth 2, i.e. signal
The processing result of processing unit 300 is exported by signal output port 2 and uses end to information.
Above-mentioned each unit can be controlled independently, can also be controlled by auxiliary and control unit 400.Example
Such as, above system further includes that auxiliary and control unit 400 are respectively implemented harmonic wave amplification unit 100 and signal detection unit 200
Added Management and control.Auxiliary and control unit 400 control harmonic wave by low speed data link (such as serial ports, usb etc.) mode
The parameter of harmonic generator part in amplification unit 100, such as phase-shift phase, the electricity of the bias voltage of electrooptic modulator, electric phase-shifter
The output power etc. of amplifier, so that it with microwave signal frequency to be measured is basic frequency that harmonic wave amplification unit, which can produce multiple,
Harmonic wave amplified signal simultaneously exports, wherein the frequency of each harmonic wave amplified signal is the positive integer times of base frequency.Letter is controlled simultaneously
Device parameters, such as sample rate, the gain of photodetector of analog-digital converter etc. in number probe unit 200, so that signal is visited
Surveying unit 200 can be used for detecting harmonic wave amplified signal, realize the conversion of analog signal to digital signal.Auxiliary and control
Unit 400 is able to detect or reads the parameter of above-mentioned related device, and carries out state modulator according to system detection demand.
It is following several that harmonic wave amplification method of the present invention realizes that the embodiment of High-Accuracy Frequency estimation can include but is not limited to
It can produce the method and matched detection method of harmonic wave.Including the harmonic wave based on electricity expands producing method: it is any can be with
The device or mode of electric harmonic wave are generated, such as the electricity frequency comb generator based on step-recovery-diode, and the harmonic wave of electricity
The devices such as detection means, such as frequency spectrograph, oscillograph, the detection means such as real-time sampling or harmonic wave sampling；It is combined based on photoelectricity
Harmonic wave expands producing method, mainly includes two types: the first kind is that the harmonic wave amplification of original signal frequency is realized on electricity, so
It will be transformed on light carrier on the electricity harmonic wave afterwards, by suitable photodetection means, realize the frequency spectrum detection and original of electric harmonic wave
The high-precision of beginning signal frequency is estimated；Second class is will to be transformed on light carrier on raw electrical signal, and conversion process is simultaneously on this
The harmonic wave amplification for realizing the raw electrical signal frequency, by suitable photodetection means, realizes the frequency spectrum of the harmonic signal
The high-precision of detection and original signal frequency is estimated.
Fig. 2 is please referred to, for the base of the microwave frequency high precision measuring system according to the present invention based on harmonic wave amplification
Present principles figure.
Basic principle of the invention is as follows.For one based on the frequency detection system of FFT, sample rate Fs,
Sampling sequence length is N, then the frequency resolution of the system is Fres=Fs/ N, maximum frequency evaluated error are Fres/2.Assuming that
It is f to measured frequency, then f can be expressed as fundamental frequency expression formula:
f1=m × Fres+δ×Fres (1)
Wherein δ be positioned at section [0,1) decimal, we by formula (1) express base frequency be referred to as analog frequency.m
It is nonnegative integer.Base frequency measured value after digitized processing is expressed as
Wherein [] indicates to be rounded nearby.We are referred to as sampling frequency by the base frequency measured value of formula (2) expression.By
Formula (1) and (2) available original frequency f1With sampling frequencyBetween meet following relationship:
Obviously, ([the δ]-δ) in formula (3) is exactly the margin of error of base frequency and sampling frequency.Due to 0≤δ < 1, so-
- δ≤0.5 0.5 < [δ], so the maximum estimated error of original signal is Fres/ 2, this is FFT frequency detection system due to frequency spectrum
There are caused by discreteness for distribution.For the margin of error ([δ]-δ), have as 0≤δ < 0.5
[δ]-δ=- δ (3.1)
Have as 0.5≤δ < 1
[δ]-δ=(1- δ) (3.2)
According to formula (3.1) and (3.2), if meeting absolute value | [δ]-δ |~0, sampling frequency is approximately equal to basic frequency
Rate.If | [δ]-δ |~0.5, the error of sampling frequency and base frequency is close to system maximum estimated error Fres/2。
If original signal is carried out harmonic wave amplification, i.e., repetition rate is generated on frequency domain and is equal to original signal base frequency
Multiple coincidence frequency component distributings (frequency comb), then can by detect harmonic components sampling frequency value, break through system most
Big evaluated error further promotes frequency detection accuracy, realizes High Precision Frequency, and concrete principle is as follows.For basic frequency
The n-th of ratethHarmonic components indicate are as follows:
fn=n × f1=n × (m+ δ) × Fres=n × m × Fres+n×δ×Fres (4)
Its sampling frequency is expressed as
Had by formula (4) and (5):
WhereinIt is by n-ththThe AVHRR NDVI value of harmonic wave sampling frequency,It is exactly the AVHRR NDVI
The margin of error between value and base frequency.Due to [n × δ]=int (n × δ)+[rmod (n × δ, 1)], wherein int () is indicated
Round numbers part, and rmod (, 1) and it indicates to take fractional part.Then the margin of error can further indicate that are as follows:
Due to 0≤rmod (n × δ, 1) < 1, so (7) formula meets
As it can be seen that the base frequency of the normalized value estimation original signal using the sampling frequency of the harmonic components of original signal, the margin of error
It will be at least than the maximum estimated margin of error F of systemres/ 2 drop n-fold lowers, thus the high-acruracy survey of signal frequency may be implemented.It is right
In (7) formula, have as 0≤rmod (n × δ, 1) < 0.5
Have as 0.5≤rmod (n × δ, 1) < 1
According to (7.1) and (7.2), if met | [rmod (n × δ, 1) }-rmod (n × δ, 1) |~0, then sampling frequency
It is approximately equal to base frequency.If | [rmod (n × δ, 1) }-rmod (n × δ, 1) |~0.5, then sampling frequency and base frequency
Error close to system maximum estimated error Fres1/n times of/2.
On the basis of formula (7), amount of measurement error can be further reduced using many algorithms.Due to original signal
Base frequency and different order harmonics frequency location often not at correlation sampling position, and its decimal be distributed rmod
(n × δ, 1) is that maximum probability is dispersed in entire resolution ratio FresIn section, so quantifying frequency using multiple and different order harmonics
The normalized value of rateStatistics calculating is carried out, further to promote the estimated accuracy of original frequency, there are many ways to the calculating
Mode, including statistical average, linear and nonlinear fitting, FFT segmentation calculating etc..
Using formula (7), for 10thThe margin of error of harmonic wave AVHRR NDVI value and the margin of error of base frequency measured value into
Numerical analysis is gone, as a result as shown in Figure 3.It is limited to systemic resolution Fres, the measurement error amount of base frequency, which is distributed, to be existed
Boundary maximum error ε1=0.5 × FreS, and its 10thThe maximum error amount of harmonic wave is ε10=0.05 × Fres, i.e., expand by harmonic wave
Increasing processing, the margin of error of the estimated value of base frequency have at least 10 times of promotion.Further, to 1th-10thHarmonic wave is returned
One margin of error for changing measured value carries out statistical average, mean error amount εmean_1-10Have and be obviously improved, as a result as shown in Figure 4.
Compared to not making the 10 of average treatmentthHarmonic error amount, 5th-10thThe worst error boundary value and ε of harmonic error amount mean value10Phase
It together, is εmean_1-10=0.05*Fres.But it is equal to ε10δ value amount substantially reduce, thus to 5th-10thThe normalization of harmonic wave is surveyed
Magnitude carries out statistical average and acquisition is significantly better than 10thThe estimated frequency error of harmonic wave is horizontal.
Therefore, in a preferred embodiment of the invention, signal processing unit 300 includes:
Fast Fourier Transform (FFT) subelement 310, for carrying out Fast Fourier Transform (FFT) to digitized harmonic wave amplified signal,
To which digitized time-domain signal is transformed to frequency domain.
Harmonic frequency estimates subelement 320, estimates for the result based on Fast Fourier Transform (FFT) harmonic frequency.
Specifically, harmonic spike lookup is carried out to the signal spectrum that Fast Fourier Transform (FFT) subelement 310 obtains.The present invention can be direct
Power threshold is set in frequency spectrum, and the crest frequency more than threshold value is extracted into the frequency as harmonic components.When necessary, originally
Invention can also use more complicated crest frequency extraction algorithm, such as difference or peak fitting etc..The survey of each harmonic frequency
The quantitative expression formula of magnitude meets above-mentioned formula (5).
Fundamental frequency high-precision estimation subelement 330, estimates base frequency for the estimated result based on harmonic frequency.
Measured value based on harmonic frequency can calculate base frequency f using above-mentioned formula (6)1, i.e., the frequency of microwave signal to be measured
Rate.
No matter using the amplification of the harmonic wave of electrical domain or area of light, once after testing, entering signal processing stage, then at signal
It is all identical for managing treatment process all in unit 300.
Embodiment two
The system composition of the embodiment two is the same as example 1, and difference is only that, harmonic wave amplification unit 100 passes through electric light
Modulation technique makes microwave signal to be measured generate multiple harmonic components in area of light.Make microwave signal in light by Electro-optical Modulation technology
Several relevant harmonic components are generated on domain, are a kind of effective ways for realizing harmonic wave amplification, the harmonic wave amplification based on this method
Microwave frequency high precision measuring system can have a variety of structures, one of exemplary embodiments are as follows.
Referring to Fig. 5, for according to the microwave frequency high precision measuring system based on harmonic wave amplification of the embodiment of the present invention two
The structural block diagram of middle harmonic wave amplification unit.As shown in figure 5, harmonic wave amplification unit 100 includes at least in the embodiment of the present invention two:
Light source 101 gives optical frequency com generator for exporting light carrier, such as output frequency is v0Light carrier.
Optical frequency com generator, in the present embodiment at least by 107 cascaded series of phase-modulator 105 and intensity modulator
At.The light carrier that light source 101 exports is input in cascade phase-modulator 105 and intensity modulator 107, by by microwave signal
The frequency that input port 1 inputs is fRFMicrowave signal Electro-optical Modulation to be measured, generate frequency interval and be equal to microwave signal to be measured frequency
The optical frequency com of rate, the spectrum distribution of the optical frequency com are exactly harmonic wave amplified signal of the microwave signal to be measured on light carrier
Frequency spectrum.The optical frequency com generator carries 3 output light of harmonic wave port by light and carries harmonic signal.It when necessary, can be micro-
Suitable position access electricity between wave signal input port 1 and the microwave interface of phase-modulator 105 and intensity modulator 107 is put
The devices such as big device, electric phase-shifter, electrical filter.V in Fig. 5-iAnd V+iIt is i-th of harmonic wave of red end on light after harmonic wave amplification respectively
I-th of harmonic frequency of frequency and Lan Duan.I is nonnegative integer.
In a preferred embodiment of the present invention, optical frequency com generator includes: in the present embodiment
Electric power splitter 102, input terminal are connect with the microwave signal input port 11, for dividing microwave signal to be measured
It is exported at two-way.It is used to drive phase-modulator 105 all the way, another way is used to driving intensity modulator 107.
First electric amplifier 103, input terminal is connect with the first via output end of electric power splitter 102, for the first via
Microwave signal amplifies；
Electric phase-shifter 104, input terminal is connect with the second road output end of electric power splitter 102, for the second road microwave
Signal carries out phase shift；
Second electric amplifier 106, input terminal is connect with the output end of electric phase-shifter 104, after to phase shift
Second tunnel microwave signal amplifies；
Phase-modulator 105, input terminal are connect with the output end of light source 101, and pass through amplified first via microwave
Signal carries out phase-modulation；
Intensity modulator 107, input terminal are connect with the output end of phase-modulator 105, and pass through amplified second
Road microwave signal carries out intensity modulated output light and carries harmonic signal.The harmonic wave amplified signal being modulated on light carrier carries humorous via light
Wave output terminal mouth 3 is exported to signal detection unit 200.Harmonic wave amplification unit 100 based on area of light is not limited to above-mentioned implementation
The structure of example, is also possible to single electrooptic modulator, be also possible to single phase modulator or intensity modulator, multiple cascades or
Phase-modulator and intensity modulator in parallel, is also possible to the circulation frequency shifter etc. based on acousto-optic modulator or electrooptic modulator
It is any to can produce Technical Architecture of the repetition rate equal to the optical frequency com of original signal base frequency.
The signal detection unit 200 for carrying harmonic signal based on light can use two kinds of embodiments.
Referring to Fig. 6, for according to the microwave frequency high precision measuring system based on harmonic wave amplification of the embodiment of the present invention two
The structural block diagram of the first embodiment of middle signal detection unit.The structure carries the direct detection method of harmonic signal using light,
Realize that light carries the photoelectricity down coversion of harmonic signal.As shown in fig. 6, signal detection unit 200 includes at least:
Photodetector 201, for carrying out photoelectric conversion, light load harmonic signal, which is down-converted to electrical domain, becomes electric harmonic wave letter
Number.That is, the light load harmonic signal that harmonic wave generates the output of unit 100 is defeated by the light load harmonic wave of signal detection unit 200
Inbound port 4 inputs, and photoelectric conversion is carried out on photodetector 201, becomes electric harmonic signal.
Analog-digital converter 202 is connect with photodetector 201, for the electric harmonic signal to be converted to digital signal
And it exports via digital signal output end mouth 5 to signal processing unit 300.
When necessary, can be accessed between photodetector 201 and analog-digital converter 202 necessary electric low-pass filter,
The devices such as electric amplifier.
Referring to Fig. 7, for according to the microwave frequency high precision measuring system based on harmonic wave amplification of the embodiment of the present invention two
The structural block diagram of the second embodiment of middle signal detection unit.The structure carries the coherent detection method of harmonic signal using light,
Realize that light carries the photoelectricity down coversion of harmonic signal.As shown in fig. 7, the main difference of the coherent detection method and direct detection method
It is, in the front end of photodetector 201, the light of input carries the centre frequency that harmonic signal and light local oscillator 203 export
For v0Repetition rate is fLOOptical frequency com optical mixer 204 mixing after carry out heterodyne coherent detection.Wherein fLOValue
It needs to meet nfRF-LO=n | fRF-fLO| < fLO/ 2, n are the maximum harmonic orders of measurement；F simultaneouslyLOIt needs to be equal to analog-to-digital conversion
The harmonic wave sample frequency of device 202, i.e. fLOIt is FRESIntegral multiple.Photoelectricity downconverted signal after heterodyne coherent detection is electric harmonic wave
Signal.Due to being the heterodyne beat down conversion of light load harmonic signal and light local oscillator, so the down conversion electricity harmonic signal
Bandwidth will be substantially less that the electric harmonic wave amplified signal bandwidth of direct detection structure output, be conducive to low bandwidth photodetector, mould
Number converter carries out signal detection to the electric harmonic wave amplified signal in broadband.In this configuration, the electric harmonic wave of the relevant down conversion of heterodyne
Signal is converted to digital signal by analog-digital converter 202, and exports via digital signal output end mouth 5 to signal processing unit
300.When necessary, necessary electric low-pass filter can be accessed between photodetector 201 and analog-digital converter 202, electricity is put
The devices such as big device.
The direct detection structure of harmonic signal is carried for light in the present embodiment, signal processing unit 300 is according to aforementioned letter
Number processing method carries out Digital Signal Processing to digitized electric harmonic signal, to realize the high-precision frequency of microwave signal to be measured
Estimation.The coherent detection structure that harmonic signal is carried for light, other than needing aforementioned signal processing method, it is also necessary to by heterodyne phase
Each frequency content of the electric harmonic signal of dry down conversion output is converted into each harmonic wave frequency of true electric harmonic wave amplified signal
Rate value, to facilitate the high-precision estimation for carrying out original signal frequency according to aforementioned signal processing method.Reduction formula is
nfRF=nfRF-LO+nfLO (8)
Wherein fRFFor fundamental frequency microwave signal frequency to be measured, fRF-LOFor the difference for being fundamental frequency and local frequency, fLOFor local oscillator
Frequency.
Embodiment three
The system of the embodiment three constitutes identical with embodiment two, and difference is only that, harmonic wave amplification unit 100 be used to making to
It surveys microwave signal and generates multiple harmonic components in electrical domain.Generate microwave signal in electrical domain using electronic device several relevant
Harmonic components be another effective ways for realizing harmonic wave amplification, a kind of typical harmonic wave amplification high-precision based on this method is surveyed
It is as follows to measure system embodiment.
Referring to Fig. 8, for according to the microwave frequency high precision measuring system based on harmonic wave amplification of the embodiment of the present invention three
The structural block diagram of middle harmonic wave amplification unit.As shown in figure 8, harmonic wave amplification unit 100 includes at least in the embodiment of the present invention three:
Electric harmonic oscillator 108, for making microwave signal to be measured generate multiple harmonic components in electrical domain.Microwave letter to be measured
It number is inputted from microwave signal input port 1, generates several harmonic components through electric harmonic oscillator 108, realize input microwave signal
Harmonic wave amplification processing.The electricity harmonic wave amplified signal is exported via electric harmonic signal output port 6 to signal detection unit 300.
A kind of typical electric harmonic oscillator 108 is electric frequency comb generator, and being typically constructed element is usually that step restores two poles
It manages (step recovery diode), is also possible to other any devices that can produce electric frequency comb.In addition to this, at this
In embodiment, electric harmonic oscillator 108 can also utilize other devices that can produce electric harmonic wave, such as electric frequency synthesizer,
The devices such as electric frequency multiplier.When necessary, it can be accessed between microwave signal input port 1 and electric harmonic oscillator 108 electrically amplified
The devices such as device, electrical filter, to be conducive to the generation and detection of electric harmonic signal.The signal detection unit 200 of the present embodiment can
Using mature electric time-domain signal or spectrum detection technology, including the sampling of real-time sampling, harmonic wave etc..
Example IV
The system of the example IV constitutes identical as embodiment two, and difference is only that, harmonic wave amplification unit 100 is by embodiment
Three electrical domain harmonic wave producing method is combined with the photodetection means of embodiment two.
Referring to Fig. 9, for according to the microwave frequency high precision measuring system based on harmonic wave amplification of the embodiment of the present invention four
The structural block diagram of middle harmonic wave amplification unit.As shown in figure 9, harmonic wave amplification unit 100 includes: in the embodiment of the present invention four
Electric harmonic oscillator 108, input terminal are connect with microwave signal input port 1, the microwave to be measured for that will input
Signal generates harmonic wave amplified signal in electrical domain, realizes that microwave signal is expanded in the harmonic wave of electrical domain.
Electrooptic modulator 109 is v for being modulated using harmonic wave amplified signal by the frequency that light carrier input port 7 inputs0
Light carrier, the up conversion of the electric harmonic wave amplified signal of realization to area of light.The light that electrooptic modulator 109 generates carries harmonic signal and passes through light
The output of harmonic wave port 3 is carried to signal processing unit 300.
The harmonic wave amplification unit 100 further includes light source, gives electric light tune for exporting light carrier by light carrier input port 7
Device 109 processed.
The connection type and structure composition of signal detection unit 200 and signal processing unit 300 and the side in embodiment two
Formula is identical.When necessary, between microwave signal input port 1 and electric harmonic oscillator 108, and electric harmonic oscillator 108 and electricity
Between optical modulator 109, the devices such as electric amplifier, electrical filter can be accessed, be conducive to harmonic wave amplified signal generation, on
Transformation and detection.
Embodiment five
Based on same inventive concept, this application provides the microwave frequency high-precision measuring methods expanded based on harmonic wave.
Referring to Fig. 10, for the microwave frequency high-precision measuring method flow chart expanded according to the preferred embodiment of the present invention based on harmonic wave.
This method can be realized based on the microwave frequency high precision measuring system based on harmonic wave amplification of foregoing individual embodiments.Such as Figure 10
Shown, the method which provides includes:
Step S1: it treats and surveys microwave signal progress harmonic wave amplification processing, generate multiple using microwave signal frequency to be measured as base
The harmonic wave amplified signal of plinth frequency simultaneously exports, wherein the frequency of each harmonic wave amplified signal is the positive integer times of base frequency.
Step S2: detecting the harmonic wave amplified signal, realizes the conversion of analog signal to digital signal.
Step S3: Digital Signal Processing is carried out to digitized harmonic wave amplified signal, realizes the high-precision of original signal frequency
Degree estimation.
Optionally, carrying out Digital Signal Processing to digitized harmonic wave amplified signal in step S3 includes:
1) Fast Fourier Transform (FFT) is carried out to digitized harmonic wave amplified signal；
2) result based on Fast Fourier Transform (FFT) estimates harmonic frequency；
3) high-precision estimation is carried out to base frequency based on the estimated result of harmonic frequency.
Optionally, in step S1 by Electro-optical Modulation technology make microwave signal to be measured generated in area of light multiple harmonic waves at
Point；Or microwave signal to be measured is set to generate multiple harmonic components etc. in electrical domain using electronic device.
In conclusion this patent proposes a kind of simple method for promoting frequency estimation accuracy, i.e., before signal detection
End, on hardware to the harmonic wave amplification processing of signal and simple signal of the signal detection rear end based on FFT related algorithm
Reason realizes the high-acruracy survey of single-frequency point or narrow band signal frequency, solves at the current simple algorithm for relying on signal detection rear end
Reason is to promote main problem present in frequency estimation accuracy.
The present invention is by way of electrical domain harmonic wave amplification or area of light harmonic wave expands mode, generates the several of microwave signal to be measured
Harmonic components.By the frequency measurement to one or several harmonic components, the estimation of original signal frequency can be obviously improved
Precision.The high-precision that this method can carry out frequency, carrier wave or bandwidth to single microwave frequency point, narrowband microwave signal is estimated.
It is calculated by numerical value, the effect of technical solution of the present invention can be verified, as shown in Figure 3 and Figure 4.It is single humorous utilizing
When wave component carries out High-Accuracy Frequency estimation, at least systemic resolution can be promoted n times, wherein n is pair of the harmonic components
Answer order.When combining progress High-Accuracy Frequency estimation using multiple harmonic components, not only systemic resolution can at least be mentioned
N times (order that n is maximum harmonic components) is risen, and the original frequency decimal that can be substantially reduced equal to the worst error value takes
It is worth range.
In short, the present invention (can not change system in the case where not changing system discrete signal samples time span
Resolution ratio FRESIn the case where), by utilizing the harmonic wave amplification technique of hardware and simple Digital Signal Processing, it is obviously improved micro-
The frequency measurement accuracy of wave signal.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of microwave frequency high precision measuring system based on harmonic wave amplification, which is characterized in that the system comprises:
Harmonic wave amplification unit, connect with microwave signal input port, surveys microwave signal progress harmonic wave amplification processing for treating, produces
Life is multiple for the harmonic wave amplified signal of basic frequency and to be exported with microwave signal frequency to be measured, wherein each harmonic wave amplified signal
Frequency is the positive integer times of base frequency；
Signal detection unit is connect with the output port of the harmonic wave amplification unit, for carrying out to the harmonic wave amplified signal
The conversion of analog signal to digital signal is realized in detection；
Signal processing unit is connect with the output port of the signal detection unit, for digitized harmonic wave amplified signal
Digital Signal Processing is carried out, realizes the high-precision estimation of original signal frequency.
2. the microwave frequency high precision measuring system according to claim 1 based on harmonic wave amplification, which is characterized in that described
Signal processing unit includes:
Fast Fourier Transform (FFT) subelement, for carrying out Fast Fourier Transform (FFT) to digitized harmonic wave amplified signal；
Harmonic frequency estimates subelement, estimates for the result based on Fast Fourier Transform (FFT) harmonic frequency；
Fundamental frequency high-precision estimation subelement, carries out high-precision estimation to base frequency for the estimated result based on harmonic frequency.
3. the microwave frequency high precision measuring system according to claim 1 based on harmonic wave amplification, which is characterized in that described
Harmonic wave amplification unit makes microwave signal to be measured generate multiple harmonic components in area of light by Electro-optical Modulation technology.
4. the microwave frequency high precision measuring system according to claim 3 based on harmonic wave amplification, it is characterised in that:
The harmonic wave amplification unit includes:
Light source gives optical frequency com generator for exporting light carrier；
Optical frequency com generator, by microwave signal input port input microwave signal Electro-optical Modulation to be measured, generate frequency between
Every the optical frequency com for being equal to microwave signal frequency to be measured, the spectrum distribution of the optical frequency com is that microwave signal to be measured is carried in light
Harmonic wave amplified signal frequency spectrum on wave；The optical frequency com generator output light carries harmonic signal；
The signal detection unit includes:
Photodetector, for carrying out photoelectric conversion, light load harmonic signal, which is down-converted to electrical domain, becomes electric harmonic signal；
Analog-digital converter, for by the electric harmonic signal be converted to digital signal and via digital signal output end mouth export to
Signal processing unit.
5. the microwave frequency high precision measuring system according to claim 4 based on harmonic wave amplification, which is characterized in that described
Optical frequency com generator includes:
Electric power splitter, input terminal are connect with the microwave signal input port, defeated for microwave signal to be measured to be divided into two-way
Out；
First electric amplifier, input terminal connects with the first via output end of electric power splitter, be used for first via microwave signal into
Row amplification；
Electric phase-shifter, input terminal are connect with the second road output end of electric power splitter, for carrying out phase to the second tunnel microwave signal
Displacement is dynamic；
Second electric amplifier, input terminal is connect with the output end of electric phase-shifter, for the second road microwave after phase shift
Signal amplifies；
The output end of phase-modulator, input terminal and light source connects, and carries out phase by amplified first via microwave signal
Position modulation；
The output end of intensity modulator, input terminal and phase-modulator connects, and passes through amplified second tunnel microwave signal
It carries out intensity modulated output light and carries harmonic signal.
6. the microwave frequency high precision measuring system according to claim 4 based on harmonic wave amplification, which is characterized in that described
Optical frequency com generator is single electrooptic modulator, single phase modulator, single intensity modulator, multiple cascades or parallel connection
Phase-modulator and intensity modulator, or the circulation frequency shifter based on acousto-optic modulator or electrooptic modulator.
7. the microwave frequency high precision measuring system according to claim 1 based on harmonic wave amplification, which is characterized in that described
Harmonic wave amplification unit is electric harmonic oscillator, for making microwave signal to be measured generate multiple harmonic components in electrical domain.
8. the microwave frequency high precision measuring system according to claim 1 based on harmonic wave amplification, which is characterized in that described
Harmonic wave amplification unit includes:
Electric harmonic oscillator, input terminal are connect with microwave signal input port, and the microwave signal to be measured for that will input is in electricity
Domain generates harmonic wave amplified signal；
Light source, for exporting light carrier to electrooptic modulator；
Electrooptic modulator realizes that electricity is humorous for modulating the light carrier inputted by light carrier input port using harmonic wave amplified signal
Up conversion of the wave amplified signal to area of light.
9. a kind of microwave frequency high-precision measuring method based on harmonic wave amplification, which is characterized in that the described method includes:
It treats and surveys microwave signal progress harmonic wave amplification processing, generate multiple harmonic waves with microwave signal frequency to be measured for basic frequency
Amplified signal simultaneously exports, wherein the frequency of each harmonic wave amplified signal is the positive integer times of base frequency；
The harmonic wave amplified signal is detected, realizes the conversion of analog signal to digital signal；
Digital Signal Processing is carried out to digitized harmonic wave amplified signal, realizes the high-precision estimation of original signal frequency.
10. the microwave frequency high precision measuring system according to claim 9 based on harmonic wave amplification, which is characterized in that institute
It states and includes: to digitized harmonic wave amplified signal progress Digital Signal Processing
Fast Fourier Transform (FFT) is carried out to digitized harmonic wave amplified signal；
Result based on Fast Fourier Transform (FFT) estimates harmonic frequency；
High-precision estimation is carried out to base frequency based on the estimated result of harmonic frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811113871.9A CN109164300B (en) | 2018-09-25 | 2018-09-25 | Microwave frequency high-precision measurement system and method based on harmonic amplification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811113871.9A CN109164300B (en) | 2018-09-25 | 2018-09-25 | Microwave frequency high-precision measurement system and method based on harmonic amplification |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109164300A true CN109164300A (en) | 2019-01-08 |
| CN109164300B CN109164300B (en) | 2020-11-13 |
Family
ID=64880179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811113871.9A Active CN109164300B (en) | 2018-09-25 | 2018-09-25 | Microwave frequency high-precision measurement system and method based on harmonic amplification |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109164300B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122972A (en) * | 2019-12-25 | 2020-05-08 | 国网北京市电力公司 | Frequency tracking measurement method and device |
| CN111257635A (en) * | 2020-01-17 | 2020-06-09 | 电子科技大学 | Harmonic detection device of multi-port nonlinear device |
| US11313930B1 (en) | 2020-11-13 | 2022-04-26 | Rohde & Schwarz Gmbh & Co. Kg | Alternation pulsed double resonance detection scheme for gapless detection in atomic vapor quantum sensors |
| CN115792478A (en) * | 2023-02-06 | 2023-03-14 | 国网浙江省电力有限公司电力科学研究院 | Method and system for realizing composite frequency test by using broadband volt-ampere characteristic meter |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86108191A (en) * | 1985-12-05 | 1987-11-04 | 罗德和施沃茨—波拉罗德公司 | Improvement to spectrum analyzer or analogous instrument frequency measurement |
| CN101021555A (en) * | 2007-03-13 | 2007-08-22 | 熊猫电子集团有限公司 | Frequency marker calibrating system based on GPS frequency standard source |
| CN101487860A (en) * | 2009-02-11 | 2009-07-22 | 中国科学技术大学 | Frequency multiplier circuit suitable for scanning force microscope frequency monitoring and its frequency measurement circuit |
| CN202119835U (en) * | 2011-05-20 | 2012-01-18 | 四川电力科学研究院 | Unstable harmonic and interharmonic measuring instrument |
| CN102435842A (en) * | 2011-09-20 | 2012-05-02 | 武汉理工大学 | Device for comparing double-mode frequency scales and measuring frequency stability |
| CN102809686A (en) * | 2012-07-05 | 2012-12-05 | 北京邮电大学 | Instantaneous frequency detection method and system for frequency sweeping source |
| US8509372B1 (en) * | 2009-11-25 | 2013-08-13 | Integrated Device Technology, Inc. | Multi-band clock generator with adaptive frequency calibration and enhanced frequency locking |
-
2018
- 2018-09-25 CN CN201811113871.9A patent/CN109164300B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86108191A (en) * | 1985-12-05 | 1987-11-04 | 罗德和施沃茨—波拉罗德公司 | Improvement to spectrum analyzer or analogous instrument frequency measurement |
| CN101021555A (en) * | 2007-03-13 | 2007-08-22 | 熊猫电子集团有限公司 | Frequency marker calibrating system based on GPS frequency standard source |
| CN101487860A (en) * | 2009-02-11 | 2009-07-22 | 中国科学技术大学 | Frequency multiplier circuit suitable for scanning force microscope frequency monitoring and its frequency measurement circuit |
| US8509372B1 (en) * | 2009-11-25 | 2013-08-13 | Integrated Device Technology, Inc. | Multi-band clock generator with adaptive frequency calibration and enhanced frequency locking |
| CN202119835U (en) * | 2011-05-20 | 2012-01-18 | 四川电力科学研究院 | Unstable harmonic and interharmonic measuring instrument |
| CN102435842A (en) * | 2011-09-20 | 2012-05-02 | 武汉理工大学 | Device for comparing double-mode frequency scales and measuring frequency stability |
| CN102809686A (en) * | 2012-07-05 | 2012-12-05 | 北京邮电大学 | Instantaneous frequency detection method and system for frequency sweeping source |
Non-Patent Citations (3)
| Title |
|---|
| 卢冰: "基于倍增FSR式光梳状滤波器阵列的瞬时频率研究", 《光电子激光》 * |
| 邢俊娜: "基于光子学的微波信号频率测量研究进展", 《激光技术》 * |
| 高亮: "微波光子技术及光纤布拉格光栅在微波及传感系统中的应用", 《中国博士学位论文全文数据库 信息科技辑》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122972A (en) * | 2019-12-25 | 2020-05-08 | 国网北京市电力公司 | Frequency tracking measurement method and device |
| CN111122972B (en) * | 2019-12-25 | 2021-09-21 | 国网北京市电力公司 | Frequency tracking measurement method and device |
| CN111257635A (en) * | 2020-01-17 | 2020-06-09 | 电子科技大学 | Harmonic detection device of multi-port nonlinear device |
| CN111257635B (en) * | 2020-01-17 | 2021-04-30 | 电子科技大学 | Harmonic detection device of multi-port nonlinear device |
| US11313930B1 (en) | 2020-11-13 | 2022-04-26 | Rohde & Schwarz Gmbh & Co. Kg | Alternation pulsed double resonance detection scheme for gapless detection in atomic vapor quantum sensors |
| CN115792478A (en) * | 2023-02-06 | 2023-03-14 | 国网浙江省电力有限公司电力科学研究院 | Method and system for realizing composite frequency test by using broadband volt-ampere characteristic meter |
| CN115792478B (en) * | 2023-02-06 | 2023-05-16 | 国网浙江省电力有限公司电力科学研究院 | Method and system for realizing composite frequency test by using broadband volt-ampere characteristic instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109164300B (en) | 2020-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109164300A (en) | Microwave frequency high precision measuring system and method based on harmonic wave amplification | |
| Renders et al. | High-accuracy spectrum analysis of sampled discrete frequency signals by analytical leakage compensation | |
| CN106940444B (en) | Coherent Doppler wind-observation laser radar based on microwave differential gain | |
| Offelli et al. | A frequency-domain procedure for accurate real-time signal parameter measurement | |
| CN104677398B (en) | A kind of Φ OTDR photosensitivity-enhancing methods and device based on frequency drift dynamic compensation | |
| CN113852416A (en) | Phase demodulation method and device with fading noise identification and elimination function | |
| CN107966172B (en) | Broadband photoelectric detector responsivity tester and testing method thereof | |
| CN111638402B (en) | Method and system for measuring frequency of microwave signal in microwave electric field | |
| US6597161B2 (en) | Method and apparatus for spectrum analysis with variable detection latency and multiple layer coherent integrations | |
| CN109813962A (en) | Frequency conversion system group delay measurement method and system based on Hilbert transform | |
| CN111123286A (en) | Self-calibration-based all-fiber Doppler cable length testing method and device | |
| CN115792861A (en) | Device and method for realizing coherent accumulation of pulse laser Doppler radar signals | |
| Wang | Sensitive digital lock‐in amplifier using a personal computer | |
| CN117073990B (en) | Linewidth testing system and method for narrow linewidth laser | |
| Koo et al. | A possible application of the PD detection technique using electro-optic Pockels cell with nonlinear characteristic analysis on the PD signals | |
| CN109951228B (en) | Laser linewidth detection method based on optical communication system channel estimation | |
| Dao et al. | Research on Improved Algorithm of Frequency Estimation Based on Complex Modulation. | |
| CN113848519B (en) | Method for measuring solid single-spin magnetic resonance frequency in real time | |
| US3938150A (en) | Microwave amplifier tube coherency test set | |
| CN113098630B (en) | 1/f noise suppression system and method based on frequency conversion and digital filtering | |
| CN116754910B (en) | Cable partial discharge monitoring method, system and equipment based on multipath optical fiber difference | |
| Gong et al. | An Algorithm for Measuring FM Signal Frequency Modulation Index by Bessel Function Ratio Method | |
| CN118654709A (en) | High demodulation precision phi-OTDR system and demodulation method based on 1bit quantization bit number | |
| CN219319592U (en) | Mixing laser frequency detection device and quantum computing system | |
| RU58731U1 (en) | RADIODALMER WITH CONTINUOUS RADIATION OF FREQUENCY-MODULATED RADIO WAVES |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |