CN106533435A - Method and system for calculating 2N real sequence by using one N complex FFT - Google Patents
Method and system for calculating 2N real sequence by using one N complex FFT Download PDFInfo
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- CN106533435A CN106533435A CN201610861661.2A CN201610861661A CN106533435A CN 106533435 A CN106533435 A CN 106533435A CN 201610861661 A CN201610861661 A CN 201610861661A CN 106533435 A CN106533435 A CN 106533435A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
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Abstract
The invention discloses a method for calculating one 2N real sequence fast Fourier transformation (FFT) by using one N complex FFT, and relates to the digital signal processing technique. The method comprises the steps: step 1, generating two-path homologous reference signals by aiming at a reference signal, and respectively inputting the two-path homologous reference signals into a frequency multiplication comb line signal generation unit and a phase-locked baseband signal generation unit, wherein the frequency multiplication comb line signal generation unit receives an externally input reference signal and applies the reference signal to generate broadband and low-phase-noise comb spectrum signal, and the phase-locked baseband signal generation unit receives an externally input reference signal, and the reference signal generates a low-frequency and small-step phase-locked baseband signal through the phase-locked baseband signal generation unit; and step 2, performing frequency mixing on the comb spectrum signal and the phase-locked baseband signal generated in step 1, performing segmented filter and amplification processing, and finally forming a broadband, small-step and low-phase-noise frequency synthesis signal to output. Compared with the single-loop phase-locked frequency source, the method optimizes the phase noise more than 15 dB.
Description
Technical field
The present invention relates to Digital Signal Processing, specifically a kind of side for using a N points plural number FFT to calculate 2N reality sequences
Method and system.The method and system save resources and of equal value with former algorithm, in identical algorithm performance and identical FPGA highest
Logical resource can be more effectively used under operating frequency.
Background technology
Existing 2N realities sequence FFT (fast algorithm of Fast Fourier Transformation discrete fourier transforms)
Method, its algorithm flow chart are as shown in Figure 1.The AD data of DDR format, shape are received first by the operating frequency of sample rate half
Into parallel N point even sequences and N point odd sequences.Then data are carried out into framing by 2N sampled points, by even frame and odd-numbered frame point
Subsequent arithmetic unit is not given.Data form to receiving enters line translation, will dutycycle 1/2 parallel odd even two-way N points
According to be transformed into all the way expire data volume 2N point continuous datas.Above-mentioned continuous data is sent into 2N point plural numbers FFT calculating cores carries out FFT
Calculate, the imaginary part part zero padding being input into during calculating.Half frequency spectrum is taken to the result after FFT calculating according to requirement of engineering, that is, is chosenInterval portions of the spectrum is stillInterval portions of the spectrum.Finally the result of two calculating sections is merged,
Export half frequency spectrum data of continuous 2N points FFT.
Tradition realizes that the method framework of 2N point real number FFT is simple, uses in FPGAOperating frequency just can be to data
Calculated, higher sample rate can be processed, it is easy to Project Realization.But because operating frequency only has the half of sample rate, need
Two computing units carry out table tennis calculating, and the computing resource for using is more.And we calculate core using general FFT and go to calculate real
During the FFT of signal, imaginary part part zero setting in the plural number of input, calculating core to FFT also has certain waste.
The content of the invention
The skill for requiring is not met by for single phaselocked loop of the prior art in the application scenario of many high requirements
Art problem, the invention discloses a kind of method and system for using a N points plural number FFT to calculate a 2N reality sequence FFT.
Technical scheme is as follows：
The invention discloses a kind of method for using a N points plural number FFT to calculate a 2N reality sequence FFT, which specifically includes
Below step：Step one, the homologous reference signal of two-way is produced for reference signal, the homologous reference signal point of two-way
Shu Ru not frequency multiplication comb line signal generation unit and lock phase baseband signal generation unit；The frequency multiplication comb line signal generation unit is received
The reference signal of outside input, and the pectination spectrum signal of broadband, Low phase noise is produced using reference signal；Lock phase base band
Signal generation unit receives the reference signal of outside input, and reference signal is produced by locking phase baseband signal generation unit
Raw low frequency, the lock phase baseband signal of little stepping；Step 2, the pectination spectrum signal that step one is produced and lock phase baseband signal are carried out
Mixing, then after region filtering enhanced processing, ultimately forms the frequency synthesized signal output of broadband, little stepping, Low phase noise.
It is finally completed broadband, little stepping, the output of Low phase noise frequency synthesized signal.More traditional monocyclic frequency of phase locking source phase noise optimization
More than 15dB.
Further, the generation of above-mentioned pectination spectrum signal specifically includes below step：Occur by frequency multiplier, comb line
Device produces higher harmonic components, takes out suitable frequency component through region filtering.
Further, above-mentioned lock phase baseband signal generation unit includes that phase discriminator, wave filter and oscillator are (such as voltage-controlled
Oscillator), the phase discriminator, wave filter and voltage controlled oscillator sequentially connect to form backfeed loop, and the output of voltage controlled oscillator is anti-
Feed phase discriminator.
Further, the homologous reference signal of above-mentioned generation two-way specifically includes below step：By reference signal
It is filtered, amplifies, after the reason of work(office, produces the homologous highly purified reference signal of two-way.
The invention also discloses a kind of system for using a N points plural number FFT to calculate a 2N reality sequence FFT, its concrete bag
Include reference signal work(point amplifying unit, frequency multiplication comb line signal generation unit, lock phase baseband signal generation unit and mixing switch filter
Ripple unit；The reference signal work(point amplifying unit is used for producing the homologous reference signal of two-way, two-way for reference signal
Homologous reference signal is input into frequency multiplication comb line signal generation unit and lock phase baseband signal generation unit respectively；The frequency multiplication comb
Line signal generation unit is used for receiving the reference signal of outside input, and produces broadband, low phase using reference signal
The pectination spectrum signal made an uproar；The lock phase baseband signal generation unit is used for receiving the reference signal of outside input, benchmark ginseng
Examine signal low frequency, the lock phase baseband signal of little stepping is produced by locking phase baseband signal generation unit；The mixing switch filtering
Unit for by pectination spectrum signal and lock phase baseband signal be mixed, then after region filtering enhanced processing, most end form
Frequency synthesized signal into broadband, little stepping, Low phase noise is exported.
By the technical scheme using the above, beneficial effects of the present invention are：Present invention utilizes frequency mixer is closed in frequency
The characteristics of spectral purity and phase noise of low frequency signal moves medium-high frequency in the case of not being significantly affected into during, passes through
The comprehensive baseband signal of frequency and comb spectral frequency combination is produced, the outer mixting circuit of phaselocked loop+ring is built, it is through mixing and filtering process, real
Now the little step frequency signal in broadband produces output.Effectively solving locks mutually monocyclic circuit when broadband frequency signals synthesize in small frequency
The indices such as stepping, low phase noise and low spurious level are difficult the problem taken into account, the synthesis of General Promotion broadband frequency source
Index properties.
The present invention is substantially improved the phase noise performance of frequency synthesized signal on traditional list phase-locked loop circuit architecture basics,
Take into account less frequency resolution simultaneously, while keeping good spurious reduction ability, be obviously improved wideband frequency composite signal
Combination property level, can provide for frequency conversion channel that purity is good, high-quality local oscillation signal.Especially for Ku and above work frequency
The frequency synthesizer of section, effect are more significantly：Compared with the monocyclic frequency of phase locking source of work similar frequency bands, in identical 10MHz frequencies
In the case of rate stepping, phase noise optimization more than 15dB, and spurious reduction ability improves more than 10dB, overall improvement is very
Substantially.
Description of the drawings
Fig. 1 is frequency multiplication comb line signal generation unit circuit structure.
Fig. 2 is lock phase baseband signal generation unit circuit structure.
Fig. 3 is mixing switch filtering element circuit structure.
Fig. 4 is the Low phase noise wideband frequency combiner circuit structure based on bicyclic mixing.
Specific embodiment
With reference to Figure of description, the specific embodiment of the present invention is described in detail.
The present invention's realizes that step is as follows：
Step one, reference signal produced after direct many times frequency multiplication high-frequency wideband, at equal intervals, the comb of super Low phase noise
Shape spectrum signal.The partial circuit principle is as shown in Figure 1.By playing excellent spectral characteristic of the pectination spectrum signal in high band, protect
Demonstrate,prove final composite signal and possess relatively low phase noise ability.The step can be completed using comb spectrum signal generating circuit, comb
Shape spectrum signal occurs circuit to be used for receiving the reference signal of outside input, and includes height using the generation of reference signal
The pectination spectrum signal of order harmonic components signal.
Step 2, the baseband signal for producing the little stepping of low frequency based on lock phase baseband signal generation unit structure, the part electricity
Road principle is as shown in Figure 2.Lock phase baseband circuit builds monocyclic lock mutually typical case's knot by digital phase discriminator, active filter, VCO
Structure, by frequency range appropriate design and distribution, produces the little step lock phase base band of L-band, it is ensured that the little Step Frequency of final composite signal
Rate resolving power ability.Reference signal produces the lock phase base band letter of low frequency, little stepping by locking phase baseband signal generation unit
Number.
Step 3, above-mentioned two parts of signals is mixed, is ultimately formed broadband frequency after region filtering enhanced processing
Rate composite signal is exported.Circuit theory is as shown in Figure 3.
Mutually pin down and make in the items characteristic such as frequency synthesis technique field, wide-band, low phase noise, small frequency stepping
About, indices can not possibly be taken into account using monotechnics systems such as the mutually monocyclic or comb spectrum signal frequency multiplications of lock to be optimal；And
Above two frequency combining method is comprehensively adopted by appropriate design, then so that develop the excellent frequency synthesizer of indices into
For possibility.Present invention utilizes frequency mixer has unique characteristic during signal frequency conversion；Such as, two signals are through mixed
After frequency device is mixed, the frequency distribution of mixer output signal is the various arithmetical operation combinations of two input signals；Output signal
Frequency step depend on input two signal frequency steppings smaller；Phase noise depends on two signal phases of input and makes an uproar
Sound chump；Spurious reduction process then depending on the intermodulation characteristic and output end filtering of frequency mixer.
This unique effect of frequency mixing technique in signal frequency conversion process, the height that step one is produced is taken full advantage of in the step
The low-frequency range of frequency range, big stepping, the pectination spectrum signal compared with Low phase noise and step 2 generation, little stepping, the lock phase base band of Low phase noise
Signal has dexterously carried out frequency spectrum shift by mixing so that the signal of final synthesis has concurrently and is mixed the above two advantage, i.e., wide
The good characteristic of the indices such as band, high band, little stepping, Low phase noise, low spurious, solves using single Phase Lock Technique or comb
The indexs such as wideband high-frequency section, small frequency stepping and low phase noise are being realized not during shape spectrum signal generation technology synthesized frequency signal
The contradiction that can be taken into account.
It is in optical mixing process, more important for the filtering process of mixed signal, because optical mixing process is realized to defeated
While entering signal and carry out frequency spectrum shift, more intermodulation spurious signal is also generated, the quality of filter effect determines output letter
Number spurious reduction level and ability.In the present invention, switch filter group and bandpass filter two stage filter are specially provided with
Mode：The first order is switch filter group, employs high q-factor cavity body filter and is designed, with operating frequency height, bandwidth
It is narrow, the features such as Out-of-band rejection ability is high, the segment design of device is filtered according to segmentation mixing scheme, and by switched shunt and
Combining, mainly filters the adjacent comb spectrum local oscillator leakage of output frequency and near-end mixing intermodulation signal；The second level is directed to final output
Ku frequency ranges design bandpass filter, mainly filter output frequency distal end mixing intermodulation, make up switch filter group and press down in distal end
The deficiency of ability processed, so that lift final composite signal in the excellent low spurious characteristic of full frequency band.
The present invention is substantially improved the phase noise performance of frequency synthesized signal on traditional list phase-locked loop circuit architecture basics,
Take into account less frequency resolution simultaneously, while keeping good spurious reduction ability, be obviously improved wideband frequency composite signal
Combination property level, can provide for frequency conversion channel that purity is good, high-quality local oscillation signal.Especially for Ku and above work frequency
The frequency synthesizer of section, effect are more significantly：Compared with the monocyclic frequency of phase locking source of work similar frequency bands, in identical 10MHz frequencies
In the case of rate stepping, phase noise optimization more than 15dB, and spurious reduction ability improves more than 10dB, overall improvement is very
Substantially.
The complete Low phase noise wideband frequency synthetic method circuit structure based on bicyclic mixing is as shown in Figure 4.Mainly there is ginseng
Examine signal work(point amplifying unit, frequency multiplication comb line signal generation unit, lock phase baseband signal generation unit and mixing switch filtering list
Several circuit units such as unit are constituted, and have collectively constituted the basic circuit structure based on the bicyclic Phase locking frequency synthesis being mixed outside ring.
1) reference signal is filtered, is amplified by reference signal work(point amplifying unit circuit, work(office is managed, and produces two-way same
Source high-purity reference signal.
2) frequency multiplication comb line signal generation unit by frequency multiplier, combs the multistage-combinations such as line generator in direct frequency doubling mode,
Higher harmonic components are produced, suitable frequency component is taken out through region filtering, use for rear class mixing.Reference signal Jing high order
High-quality comb spectrum signal can be produced after frequency multiplication, it is ensured that the good phase noise characteristic of output signal.
3) lock phase baseband signal generation unit to be constructed by using digital phase discriminator, active loop wave filter, VCO jointly
Lock phase baseband circuit, realizes on the basis of reference signal, and the comprehensive lock phase baseband signal of frequency of L-band 10MHz frequency steps is produced,
Frequently comprehensive lock phase baseband signal locks phase baseband signal, is characterized in that frequency range is low, stepping is little, characteristic of mutually making an uproar is good.
4) it is mixed switch filtering unit to be mixed above-mentioned lock phase base band, frequency multiplication comb line combination of frequency signal, arranges and divide
Section switch filter, after segmented filtering, amplification, is finally completed broadband, little stepping, the output of Low phase noise frequency synthesized signal.
For example, adopt the inventive method have developed to produce Ku frequency range 10MHz stepping broadband local oscillators source, output phase noise
Better than -90dBc@1KHz；More traditional monocyclic frequency of phase locking source phase noise optimizes more than 15dB, while spurious reduction ability keeps
In more than 60dBc, more traditional monocyclic more than frequency of phase locking source optimization 10dB, local vibration source overall performance level are obviously improved, preferably
Meet engineer applied needs.
The coefficient gone out given in the above embodiments and parameter, are available to those skilled in the art to realize or use
Invention, invention is not limited and only takes aforementioned disclosed numerical value, in the case of the thought without departing from invention, the technology of this area
Personnel can make various modifications or adjustment to above-described embodiment, thus the protection domain of invention is not by above-described embodiment institute
Limit, and should be the maximum magnitude for meeting the inventive features that claims are mentioned.
Claims (5)
1. a kind of method for using N points plural number FFT to calculate a 2N reality sequence FFT, which specifically includes below step：Step
First, the homologous reference signal of two-way is produced for reference signal, the homologous reference signal of two-way is input into frequency multiplication comb line respectively
Signal generation unit and lock phase baseband signal generation unit；The frequency multiplication comb line signal generation unit receives the benchmark of outside input
Reference signal, and the pectination spectrum signal of broadband, Low phase noise is produced using reference signal；Lock phase baseband signal generation unit connects
The reference signal of outside input is received, reference signal produces low frequency, little stepping by locking phase baseband signal generation unit
Lock phase baseband signal；Step 2, the pectination spectrum signal that step one is produced and lock phase baseband signal are mixed, and are then passed through
After region filtering enhanced processing, the frequency synthesized signal output of broadband, little stepping, Low phase noise is ultimately formed.
2. the method that a N points plural number FFT as claimed in claim 1 calculates a 2N reality sequence FFT, it is characterised in that institute
The generation for stating pectination spectrum signal specifically includes below step：Higher harmonic components, Jing are produced by frequency multiplier, comb line generator
Cross region filtering and take out suitable frequency component.
3. the method that a N points plural number FFT as claimed in claim 1 calculates a 2N reality sequence FFT, it is characterised in that institute
Stating lock phase baseband signal generation unit includes phase discriminator, wave filter and oscillator, the phase discriminator, wave filter and voltage controlled oscillator
Sequentially connection forms backfeed loop, and the output of voltage controlled oscillator feeds back to phase discriminator.
4. the method that a N points plural number FFT as claimed in claim 1 calculates a 2N reality sequence FFT, it is characterised in that institute
State the homologous reference signal of generation two-way and specifically include below step：Reference signal is filtered, is amplified, work(office is managed
Afterwards, produce the homologous highly purified reference signal of two-way.
5. a kind of system for using N points plural number FFT to calculate a 2N reality sequence FFT, it is characterised in that specifically include with reference to letter
Number work(point amplifying unit, frequency multiplication comb line signal generation unit, lock phase baseband signal generation unit and mixing switch filtering unit；Institute
Stating reference signal work(point amplifying unit is used for producing the homologous reference signal of two-way, the homologous benchmark ginseng of two-way for reference signal
Examine signal and be input into frequency multiplication comb line signal generation unit and lock phase baseband signal generation unit respectively；The frequency multiplication comb line signal is produced
Unit is used for receiving the reference signal of outside input, and produces the comb spectrum of broadband, Low phase noise using reference signal
Signal；The lock phase baseband signal generation unit is used for receiving the reference signal of outside input, and reference signal passes through
Lock phase baseband signal generation unit produces low frequency, the lock phase baseband signal of little stepping；The mixing switch filtering unit is used for will
Pectination spectrum signal and lock phase baseband signal are mixed, and then after region filtering enhanced processing, ultimately form broadband, small step
Enter, the frequency synthesized signal of Low phase noise is exported.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110208747A (en) * | 2019-06-11 | 2019-09-06 | 上海航天电子通讯设备研究所 | A kind of X-Ku band radar agile frequency source device |
| CN113452410A (en) * | 2020-03-25 | 2021-09-28 | 北京振兴计量测试研究所 | Frequency hopping broadband channel frequency synthesizer and frequency synthesis method |
| CN114839587A (en) * | 2022-03-25 | 2022-08-02 | 中国电子科技集团公司第二十九研究所 | External correction method for interferometer system |
| CN115882896A (en) * | 2022-11-25 | 2023-03-31 | 中国电子科技集团公司第二十九研究所 | DDS spread spectrum circuit, device and method for obtaining optimal scheme of spread spectrum circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208747A (en) * | 2019-06-11 | 2019-09-06 | 上海航天电子通讯设备研究所 | A kind of X-Ku band radar agile frequency source device |
| CN113452410A (en) * | 2020-03-25 | 2021-09-28 | 北京振兴计量测试研究所 | Frequency hopping broadband channel frequency synthesizer and frequency synthesis method |
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| CN114839587B (en) * | 2022-03-25 | 2023-09-05 | 中国电子科技集团公司第二十九研究所 | External correction method for interferometer system |
| CN115882896A (en) * | 2022-11-25 | 2023-03-31 | 中国电子科技集团公司第二十九研究所 | DDS spread spectrum circuit, device and method for obtaining optimal scheme of spread spectrum circuit |
| CN115882896B (en) * | 2022-11-25 | 2024-04-05 | 中国电子科技集团公司第二十九研究所 | DDS spread spectrum circuit, device and method for obtaining optimal scheme of spread spectrum circuit |
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