CN106027156B - A kind of microwave signal frequency measuring method and device based on optics analog-to-digital conversion - Google Patents
A kind of microwave signal frequency measuring method and device based on optics analog-to-digital conversion Download PDFInfo
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- CN106027156B CN106027156B CN201610272724.0A CN201610272724A CN106027156B CN 106027156 B CN106027156 B CN 106027156B CN 201610272724 A CN201610272724 A CN 201610272724A CN 106027156 B CN106027156 B CN 106027156B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/524—Pulse modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
Abstract
The present invention relates to field of photoelectric technology, in particular to a kind of microwave signal frequency measuring method and device based on optics analog-to-digital conversion.Method of the invention, using the relatively prime optical analog-to-digital converter of three tunnel sample rates, it treats respectively and surveys microwave signal progress down coversion analog-to-digital conversion, Fast Fourier Transform is carried out to digital signal again, obtain channel frequency measurement result, calculating finally is compared to three channel results, obtains the frequency of microwave signal to be measured.The present invention measures microwave signal frequency using optical analog-to-digital converter, significantly improves measurement accuracy and measurement range.
Description
Technical field
The present invention relates to field of photoelectric technology, in particular to a kind of broadband based on optics analog-to-digital conversion, High-precision Microwave
Signal frequency measurement method and device.
Background technique
With the development of Microwave photonics, surveyed using the method for microwave photon technology measurement microwave signal frequency because it has
The advantages such as frequency range is big, precision is high, electromagnetism interference receive more and more attention.
Be divided into three classes currently based on the microwave signal frequency measuring method of microwave photon technology: the mapping of frequency-power, frequency-when
Between mapping and frequency-space mapping.Microwave signal to be measured is modulated on light carrier by frequency-power mapping method, utilizes optics
The realization frequency measurement of different frequency microwave signal power difference in attenuation caused by dispersion, Nguyen et al. (Nguyen L V T,
Hunter D B.A photonic technique for microwave frequency measurement.IEEE
Photonics technology letters, 2006,18 (9-12): 1188-1190.) using the method achieve frequency positions
In the measurement of microwave signal within the scope of 4-12GHz, precision reaches 100MHz.Frequency-time domain mapping method is by microwave signal to be measured
It is modulated on light carrier, realizes frequency measurement, Nguyen using different frequency microwave signal delay variance caused by optical dispersion
Et al. (Nguyen L V T.Microwave photonic technique for frequency measurement of
simultaneous signals.Photonics Technology Letters,IEEE,2009,21(10):642-644.)
Using the method achieve measuring while 20GHz and 40GHz signal, but because system needs high-speed optical switch and high-speed pulse
Time witness mark is set, and system accuracy is difficult to be promoted.Microwave signal to be measured is modulated to light and carried by frequency-space mapping method
On wave, frequency measurement, Wang etc. are realized using different frequency microwave signal diffraction angular difference caused by space optics dispersion element
People (Wang C, Yao J P.Ultralhigh-resolution photonic-assisted microwave frequency
identification based on temporal channelization.IEEE Trans Microw Theory
Techn, 2013,61 (12): 4275-4282.) using the method achieve range 25GHz, the frequency measurements of precision 55MHz.
In conclusion at present existing microwave photon frequency measurement scheme there are precision it is not high, measurement range is limited the problems such as, and
Big multi-scheme can only measure single-frequency microwave signal, be unable to satisfy increasingly complicated radio frequency environment middle width strip microwave signal
High-acruracy survey application.
Summary of the invention
The present invention is in view of the above-mentioned problems, propose a kind of microwave signal frequency measurement method and dress based on optics analog-to-digital conversion
It sets.
A kind of technical solution of the present invention: microwave signal frequency measuring method based on optics analog-to-digital conversion, comprising the following steps:
It a. is f by frequency using electrooptic modulatorsMicrowave signal to be measured be loaded into repetition rate be f1Ultrashort light pulse
On sequence intensity envelope, the optics down coversion sampling of microwave signal to be measured is realized, recycling sample frequency is f1Electronics modulus
Converter is quantified and is encoded, and first passage optics analog-to-digital conversion is completed；
It b. is f by frequency using electrooptic modulatorsMicrowave signal to be measured be loaded into repetition rate be f2Ultrashort light pulse
(f on sequence intensity envelope2With f1It is relatively prime), realize the optics down coversion sampling of microwave signal to be measured, recycling sample frequency is f2
Electronic analogue-to-digital converter quantified and encoded, complete second channel optics analog-to-digital conversion；
C. the microwave signal to be measured that frequency is fs is loaded into repetition rate using electrooptic modulator is f3Ultrashort laser arteries and veins
Rush (f on sequence intensity envelope3With f1、f2It is relatively prime), it realizes the optics down coversion sampling of microwave signal to be measured, recycles sampling frequency
Rate is f2Electronic analogue-to-digital converter quantified and encoded, complete third channel optics analog-to-digital conversion；
D. Fourier transformation is carried out respectively using the digital signal that data processing module exports three channels, obtain three
Channel is to the frequency fsample after signal down coversion analog-to-digital conversion1、fsample2、fsample3, operation is compared to it, is obtained
Obtain the final frequency measurement result fr of system.
The present invention program is by 3 mode-locked lasers, 3 electrooptic modulators, 3 narrowband detectors, 3 analog-digital converters, 1
A microwave signal source and 1 data processing module are constituted.The microwave to be measured that 3 electrooptic modulators respectively issue microwave signal source
On the ultrashort pulse sequence strength pulse envelope that signal modulation is exported to 3 mode-locked lasers；Again respectively by 3 narrowband detections
Device converts optical signals into electric impulse signal；Then quantified and encoded by 3 analog-digital converters；Finally using at data
Reason module carries out data processing to the digital signal in three channels respectively.
The present invention optical analog-to-digital converter relatively prime using three tunnel sample rates is treated survey microwave signal progress down coversion respectively
Analog-to-digital conversion carries out Fast Fourier Transform (FFT) to digitized signal, obtains triple channel frequency measurement as a result, carrying out to three channel results
Comparing calculation obtains measured signal frequency.
Beneficial effects of the present invention are to realize microwave signal frequency measurement using optical analog-to-digital converter, since optics modulus turns
The analog bandwidth of parallel operation is big, precision is high, can load the characteristics of multiple-frequency signal, this Frequency Measurement System realizes wide scope, high-precision, more
Frequency microwave signal measurement；And the system structure is simple, anti-electromagnetic interference capability is strong.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the microwave signal frequency measuring device provided by the invention based on optics analog-to-digital conversion；
Fig. 2 is to carry out frequency measurement, first passage analog-digital conversion result and matched curve to 46.6GHz microwave signal；
Fig. 3 is to carry out frequency measurement, first passage analog-digital conversion result spectrogram to 46.6GHz microwave signal；
Fig. 4 is to carry out frequency measurement, second channel analog-digital conversion result and matched curve to 46.6GHz microwave signal；
Fig. 5 is to carry out frequency measurement, second channel analog-digital conversion result spectrogram to 46.6GHz microwave signal；
Fig. 6 is to carry out frequency measurement, third channel analog-digital conversion result and matched curve to 46.6GHz microwave signal；
Fig. 7 is to carry out frequency measurement, third channel analog-digital conversion result spectrogram to 46.6GHz microwave signal.
Specific embodiment
The present invention is described in detail in knot and drawings and examples below.
As shown in Figure 1, apparatus structure is swashed by the first mode-locked laser 101, the second mode-locked laser 102, third mode locking
Light device 103, the first electrooptic modulator 201, the second electrooptic modulator 201, third electrooptic modulator 203, the first narrowband detector
301, the second narrowband detector 302, third narrowband detector 303, the first analog-digital converter 401, the second analog-digital converter 402,
Third analog-digital converter 403, data processing module 5, microwave signal source 6 are constituted.Three 101,102 and 103 points of mode-locked laser
Not Shu Chu repetition rate be f1、f2And f3Light pulse sequence, measured signal 6 divides three, three tunnel electrooptic modulator 201,202 and
203 are loaded on three road light pulse sequences, realize optical sampling；Three road Optical Sampling pulses are converted into electricity through narrowband detector respectively
Pulse signal, then it is quantified and is encoded by analog-digital converter；Data processing module 5 carries out in Fu three railway digital signals
Leaf transformation simultaneously compares calculating to it, obtains final frequency measurement result.
Specifically, being converted to example with first passage optics modulus, the principle is as follows:
The ultrashort light pulse sequence of constant amplitude degree at equal intervals on first mode-locked laser output time-domain, show as on frequency domain it is equal between
Every a series of optical modes of, PGC demodulation, the first mode-locked laser frequency spectrum is represented by
Wherein, fcIndicate the centre frequency of mode-locked laser, pnFor the Fourier coefficient of pulse shape, Δ f is mode-locked laser
Think highly of complex frequency, δ (x) is unit shock response.By taking simple type identifier single-frequency microwave signal as an example, forms of time and space is standard cosine
Function, frequency spectrum are represented by
Wherein fsFor measured signal frequency, Π is signal amplitude.Microwave signal to be measured is loaded through the first electrooptic modulator
In the light pulse exported to laser, i.e., double sideband modulation is carried out to each optical mode, has modulated post-sampling light pulse frequency domain
Form is
Wherein, m indicates the index of modulation of modulator.Electric pulse is converted to by light pulse sequence is sampled by narrowband detector
Sequence realizes that optical beat, the signal spectrum of output are expressed as
Wherein, DnWith EnIndicate corresponding signal amplitude, modal sets number M is determined by detector bandwidth.Turned using electronics modulus
Parallel operation completes quantization and coding, and electronic analogue-to-digital converter can filter out direct current signal, and analog-digital converter using AC coupled mode
Instant bandwidth be f1/ 2, frequency fsample where spectrum peak1As the channel down coversion optics analog-to-digital conversion measures frequency
Rate.
Similarly, the down coversion optics analog-digital conversion result that second channel and third channel optical analog-to-digital converter measure is distinguished
For fsample2、fsample3, and three channels meet the frequency after signal down coversion analog-to-digital conversion
fsamplei≤fi/ 2 (i=1,2,3) (5)
Wherein, the actually measured signal frequency fr in any channeliWith fsamplei(i=1,2,3) there are two kinds of feelings for relationship between
Condition works as friWith fiWhen/2 quotient's rounding result is odd number
fri=(ni+1)fi-fsamplei(niFor natural number, i=1,2,3) (6)
Work as friWith fiWhen/2 quotient's rounding result is even number
fri=nifi+fsamplei(niFrequency resultant is measured to three channels for natural number, i=1,2,3) (7) to carry out
Comparing calculation calculates and enables fr1=fr2=fr3N1、n2、n3, obtain the final frequency measurement result fr=fr of system1。
The present invention optical analog-to-digital converter relatively prime using three tunnel sample rates is treated survey microwave signal progress down coversion respectively
Analog-to-digital conversion carries out Fast Fourier Transform (FFT) to digitized signal, obtains triple channel frequency measurement as a result, carrying out to three channel results
Comparing calculation obtains measured signal frequency.
Embodiment
This example is emulated using Optisystem software.Under parameter in detail below, it is based on to provided by the invention
The microwave signal frequency measuring method of optics analog-to-digital conversion is simulated emulation.Wherein the central wavelength of three mode-locked lasers is
1550nm, output average light power are 10mW, pulse width 500fs, repetition rate f1、f2、f3Respectively 0.99GHz,
1GHz,1.01GHz；Three electrooptic modulator analog bandwidths are 50GHz, modulation depth 30dB；Narrowband detector three dB bandwidth is
3GHz；It is identical as corresponding channel mode-locked laser that electronic analogue-to-digital converter adopts rate, quantization digit 8bit, sampling number 256；It is micro-
Wave signal source output frequency is the microwave signal of 46.6GHz；Every channel is based on the above setting, and which is 0~
50GHz。
In channel 1 mode-locked laser repetition rate be 0.99GHz, i.e., the channel optical sample rate be 0.99GS/s, 46.6
It is 0.07 to 0.99 remainder result, by formula (5), (6), (7) it is found that channel 1 measures on frequency theory as 0.07GHz；Similarly,
Optical sampling rate is 1GS/s in channel 2, is 1.01GS/s in channel 3, channel 2,3, which measures frequency theory value, to be respectively
0.4GHz,0.14GHz.Emulation three channel analog-digital conversion results of gained and matched curve are respectively as shown in Fig. 2,4 and 6.By scheming
3, the resulting three channel frequency spectrum results of Fourier transformation are carried out it is found that three channel down coversions to digital signal shown in 5 and 7
Frequency resultant is respectively 0.0699GHz, 0.400GHz, 0.139GHz after sampling, thus calculates the final frequency measurement result fr of system
For 46.599GHz, high-precision microwave signal frequency measurement is completed.
Above-mentioned specific embodiment completes the frequency measurement to frequency for 46.6GHz microwave signal, and measurement result is
46.599GHz, error are only 1MHz, and measuring device has the advantages that with high accuracy.
By specific example it is found that the invention proposes a kind of microwave signal frequency measuring methods and dress based on optics analog-to-digital conversion
It sets, it has the advantages that measurement range is big, with high accuracy, in addition can also survey multiple-frequency signal, the features such as anti-electromagnetic interference capability is strong.
In addition, actual analog-digital converter can reach bigger storage depth, higher frequency resolution is obtained, realizes this system more
High frequency-measurement accuracy.
It is further to note that the present invention is not limited to the specific details in the above embodiment, in original of the invention
A variety of simplification, modification within the scope of reason method belong to protection content of the invention.
Claims (3)
1. a kind of microwave signal frequency measuring method based on optics analog-to-digital conversion, which comprises the following steps:
A. being utilized respectively sample rate is f1、f2、f3Optical analog-to-digital converter treat survey microwave signal carry out down coversion optics modulus
Conversion, obtains digital signal, wherein f1、f2、f3It is relatively prime；
B. Fourier transformation is carried out respectively using the digital signal that data processing module exports three channels, obtained respectively to letter
Number the frequency after down coversion analog-to-digital conversion, referred to as Fourier frequency are carried out, and calculating is compared to three Fourier frequencies, it is extensive
It appears again frequency input signal, obtains final frequency measurement result.
2. a kind of microwave signal frequency measuring method based on optics analog-to-digital conversion according to claim 1, which is characterized in that tool
Body method are as follows:
It is f using repetition rateiMode-locked laser output ultrashort light pulse through intensity modulator to frequency be fsTo micrometer
Wave signal carries out the sampling of optics down coversion, wherein i=1, and 2,3；The electronics for recycling sample rate equal with laser repetition rate
Analog-digital converter is quantified and is encoded, and digital signal is obtained；Fourier transformation is carried out to digital signal, obtains down coversion modulus
Signal frequency fsample after conversioni, frequency fr is finally measured with corresponding channeliBetween relationship there are two kinds of situations, when
friWith fi/ 2 quotient is rounded fr when result is odd numberi=(ni+1)fi-fsamplei, work as friWith fiIt is even that/2 quotient, which is rounded result,
Fr when numberi=nifi+fsamplei, wherein niFor natural number, i=1,2,3；The down converted frequencies result that three channels are measured into
Row comparing calculation, calculates and enables fr1=fr2=fr3N1、n2、n3, obtain the final frequency measurement result fr=fr of system1。
3. a kind of microwave signal frequency measuring device based on optics analog-to-digital conversion, which is characterized in that including the first mode-locked laser
(101), the second mode-locked laser (102), third mode-locked laser (103), the first electrooptic modulator (201), the second electric light tune
Device (202) processed, third electrooptic modulator (203), the first narrowband detector (301), the second narrowband detector (302), third are narrow
Band detector (303), the first analog-digital converter (401), the second analog-digital converter (402), third analog-digital converter (403), number
According to processing module (5), microwave signal source (6)；
First mode-locked laser (101), the first electrooptic modulator (201), the first narrowband detector (301), the first modulus
Converter (401) is sequentially connected composition first passage optical analog-to-digital converter；Second mode-locked laser (102), the second electric light tune
Device (202) processed, the second narrowband detector (302), the second analog-digital converter (402) are sequentially connected composition second channel optics modulus
Converter；Third mode-locked laser (103), third electrooptic modulator (203), third narrowband detector (303), third modulus turn
Parallel operation (403) is sequentially connected composition third channel optical analog-to-digital converter；
The mode-locked laser (101,102,103) for generating ultrashort light pulse sequence, using electrooptic modulator (201,202,
203) by microwave signal source (6) generate signal loading to corresponding channel ultrashort light pulse sequence on, detector (301,302,
303) light pulse sequence is converted into electric impulse signal, then by analog-digital converter (401,402,403) by corresponding channel semaphore
Change, coding, data processing module (5) carries out Fourier transformation and comparing calculation to digital signal obtained by triple channel, obtains to be measured
Microwave signal frequency.
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| CN109490624B (en) * | 2018-10-19 | 2020-11-10 | 陕西长岭电子科技有限责任公司 | Pulse signal frequency measurer |
| CN110022176B (en) * | 2019-03-20 | 2020-10-16 | 广东工业大学 | Broadband tunable high-precision optical fractional order Fourier converter and implementation method thereof |
| CN110071767B (en) * | 2019-04-03 | 2020-09-04 | 电子科技大学 | Frequency measurement method and device based on limited time stretching down-conversion microwave signal |
| CN111478729B (en) * | 2020-04-07 | 2022-10-11 | 上海交通大学 | Method for testing performance of demultiplexing module in optical analog-to-digital conversion system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201830267U (en) * | 2010-09-10 | 2011-05-11 | 西南交通大学 | Photon type digital microwave frequency measuring device adopting phase shift comb type filter array |
| CN102981048A (en) * | 2011-09-06 | 2013-03-20 | 北京邮电大学 | Optical-sampling-based radio frequency measuring method and measuring device |
| CN103424618A (en) * | 2013-07-01 | 2013-12-04 | 闽南师范大学 | Photonic microwave frequency measurement method and device |
| CN103837740A (en) * | 2013-12-25 | 2014-06-04 | 北京航天测控技术有限公司 | High-precision digital instantaneous frequency measurement method and device |
-
2016
- 2016-04-29 CN CN201610272724.0A patent/CN106027156B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201830267U (en) * | 2010-09-10 | 2011-05-11 | 西南交通大学 | Photon type digital microwave frequency measuring device adopting phase shift comb type filter array |
| CN102981048A (en) * | 2011-09-06 | 2013-03-20 | 北京邮电大学 | Optical-sampling-based radio frequency measuring method and measuring device |
| CN103424618A (en) * | 2013-07-01 | 2013-12-04 | 闽南师范大学 | Photonic microwave frequency measurement method and device |
| CN103837740A (en) * | 2013-12-25 | 2014-06-04 | 北京航天测控技术有限公司 | High-precision digital instantaneous frequency measurement method and device |
Non-Patent Citations (3)
| Title |
|---|
| "一种基于互质采样的相关检测算法";曹斌 等;《中国科技论文在线 http://www.paper.edu.cn》;20151130;第7-11页 |
| "高速高精度光学模数转换器的研究进展";谢朝杰 等;《激光杂志》;20151230;第36卷(第11期);第1-7页 |
| "高速高精度光学模数转换器的研究进展";谢朝杰 等;《激光杂志》;20151230;第36卷(第11期);第7-11页 |
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