CN105242242B - A kind of super large bandwidth signal pre-distortion compensated method based on parameter fitting - Google Patents
A kind of super large bandwidth signal pre-distortion compensated method based on parameter fitting Download PDFInfo
- Publication number
- CN105242242B CN105242242B CN201510536421.0A CN201510536421A CN105242242B CN 105242242 B CN105242242 B CN 105242242B CN 201510536421 A CN201510536421 A CN 201510536421A CN 105242242 B CN105242242 B CN 105242242B
- Authority
- CN
- China
- Prior art keywords
- super large
- large bandwidth
- signal
- bandwidth signal
- fitting
- 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.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention relates to a kind of super large bandwidth signal pre-distortion compensated method based on parameter fitting, this method is by analyzing the super large bandwidth signal of distortion, extract the distorted characteristic of super large bandwidth signal generation system, calculate the amplitude distortion parameter and phase distortion parameter related to its distortion, simple multiplication is carried out using the theoretical value of amplitude distortion parameter and phase distortion parameter and super large bandwidth signal and division calculation can be with the base band data of real-Time Compensation super large bandwidth signal, finally the base band data of the super large bandwidth signal after compensation is sent out using field programmable gate array (FPGA) and digital analog converter (DAC), super large bandwidth signal after being compensated.This method need not construct the complex operations such as predistortion filter, realize simple；Substantial amounts of multiplier or mass storage are not needed, resource consumption is few；Compensation amplitude error and phase error are reduced to 1/10th before compensation, and compensation effect is obvious；Suitable for the pre-distortion compensated of super large bandwidth signal.
Description
Technical field
The present invention relates to super large bandwidth radar signal source domain, more particularly to a kind of super large bandwidth letter based on parameter fitting
Number pre-distortion compensated method, the super large bandwidth signal suitable for producing high quality.
Background technology
With the development of Radar Technology, the bandwidth of transmission signal gradually increases, and the signal bandwidth of many radars has reached at present
To upper GHz, i.e., so-called super large bandwidth signal.Under so big bandwidth, the influence of the characteristic of hardware circuit to signal quality
It is fairly obvious, it is embodied as：
1) ultrahigh speed analog-digital chip is to produce the most-often used device of super large bandwidth signal, its sinc effect cause with
Signal frequency rise signal amplitude to decline, some signal amplitudes can decline more than 3dB；
2) for the humorous clutter in suppression system, necessarily using various wave filters, and wave filter is suppressing the same of humorous clutter
When, also resulting in super large bandwidth signal amplitude fluctuation and phase place change, particularly phase place change can reach more than tens of degree；
And super large bandwidth radar will realize very high performance, very high is required to super large bandwidth signal, requires that amplitude becomes mostly
Change within 1dB, phase place change is in 10 degree, and these distortions that practical devices are brought all are that system is flagrant.Therefore need
It could be used after being compensated to super large bandwidth signal.
The super large bandwidth signal used at present is substantially linear FM signal.Traditional linear FM signal production method
There are two kinds：Method based on direct digital synthesizers (DDS) chip and the method based on DAC chip.Wherein, only based on DAC cores
The method of piece can carry out pre-distortion compensated.The existing compensation method based on DAC chip is following two：
1) directly by predistortion Waveform storage in fpga chip, periodically read and give DAC chip.This method is for super
, it is necessary to very big memory space (several million ranks) for big bandwidth signal, and storage can be read out at a high speed, just at present
Spaceborne chip for can not realize substantially；
2) predistortion filter is constructed, for super large bandwidth signal, the filter order of construction is too high (hundreds of ranks),
Substantial amounts of multiplier is needed to realize, cost is too big；And wave filter can not compensating phase distortion.
In view of the characteristics of compensation method hardware resource consumption is big at present, it is unfavorable for super large bandwidth signal source to miniaturization, light
The direction of quantization is developed, and particularly constrains the further development in spaceborne super large bandwidth signal source.
According to existing disclosed data check, compensation method simple, that resource consumption is few is still not carried out at present.
The content of the invention
The technology of the present invention solves problem：Overcome the above-mentioned deficiency of prior art, there is provided a kind of based on parameter fitting
Super large bandwidth signal pre-distortion compensated method, by analyzing the super large bandwidth signal of distortion, extract super large bandwidth letter
The distorted characteristic of number generation system, calculates the amplitude distortion parameter and phase distortion parameter related to its distortion, utilizes amplitude
Distortion parameter and phase distortion parameter and the theoretical value of super large bandwidth signal progress simple multiplication and division calculation can be mended in real time
The base band data of super large bandwidth signal is repaid, is finally sent the base band data of the super large bandwidth signal after compensation using FPGA and DAC
Go out, you can the super large bandwidth signal after being compensated.This method need not construct the complex operations such as predistortion filter, realize letter
It is single；Substantial amounts of multiplier or mass storage are not needed, resource consumption is few；Compensation amplitude error and phase error are reduced to
1/10th before compensation, compensation effect is obvious；Suitable for the pre-distortion compensated of super large bandwidth signal.
The present invention technical solution be：A kind of super large bandwidth signal pre-distortion compensated method based on parameter fitting,
It is as follows including step：
(1) super large bandwidth signal is gathered from radar, the super large bandwidth signal is judged, if the super large bandwidth signal is
Intermediate frequency or radiofrequency signal, then the intermediate frequency or radiofrequency signal all the way are gathered, into step (2)；If the super large bandwidth signal is base band
Signal, then the I roads of the baseband signal and the data on Q roads are gathered simultaneously, into step (3)；
(2) Digital Down Convert processing is carried out to the intermediate frequency or radiofrequency signal of step (1) collection, obtains the base band after down coversion
The I roads of signal and Q roads two paths of data, into step (3)；
(3) theoretical value of the baseband signal of step (1) or step (2) is set
0≤n<N, N are the collection points in the whole collection duration, and A [n] is the theory of the baseband signal of step (1) or step (2)
The amplitude of value,For step (1) or the phase of the theoretical value of the baseband signal of step (2)；
(4) measured value of step step (1) or the baseband signal of step (2) is expressed as complex signal form b [n]=B [n]
ejθ[n], 0≤n<N, B [n] represents the amplitude of the measured value of the baseband signal of step (1) or step (2) in formula, and θ [n] represents step
(1) or the measured value of the baseband signal of step (2) phase；
(5) according to the B [n] of step (4) and the A [n] of step (3), the generation system of the super large bandwidth signal of calculation procedure (1)
System, i.e. radar, amplitude distortion characteristics F [n], formula is as follows：
F [n]=B [n]/A [n]；
(6) according to the θ [n] of step (4) and step (3)The generation of the super large bandwidth signal of calculation procedure (1)
The phase distortion characteristic δ [n] of system, formula is as follows：
(7) generation system of the mode of sine wave fitting to the super large bandwidth signal of step (5) is added using fitting of a polynomial
Amplitude distortion characteristics F [n] be fitted, obtain following formula F [n] '：
In formula, M1For the number of fitting of a polynomial, N1For the sinusoidal frequency number of sine wave fitting,For fitting of a polynomial
Coefficient,For the amplitude of sine wave fitting,For the frequency of sine wave fitting,For the phase of sine wave fitting；
The phase distortion characteristic δ [n] of the system of step (6) is carried out using the mode of fitting of a polynomial plus sine wave fitting
Fitting, obtains following formula δ [n] '：
M in formula2For the number of fitting of a polynomial, N2For the sinusoidal frequency number of sine wave fitting,For fitting of a polynomial
Coefficient,For the amplitude of sine wave fitting,For the frequency of sine wave fitting,For the phase of sine wave fitting；
(8) F [n] ' of step (7) and δ [n] ' are injected into the theoretical value of the baseband signal of step (3), after being compensated
Super large bandwidth signal base band data a ' [n], complete super large bandwidth signal pre-distortion compensated and calculate, formula is as follows：
It is used in above-mentioned in super large bandwidth signal pre-distortion compensated method, step (8) is adapted to add DAC to realize with FPGA,
Method is as follows：
A) the theoretical value a [n] of FPGA elder generations calculation procedure (3) baseband signal, while FPGA carries out a [n] phase compensation value
Calculate and amplitude compensation value calculates, obtain phase compensation value δ [n] ' and amplitude compensation value
F[n]'；
B) ask for cos (*) and sin (*) value to the phase compensation value δ [n] ' of step (a), and with the theory of baseband signal
Value a [n] carries out complex multiplication operation, completes phase compensation, obtains the base band data of the super large bandwidth after phase compensation；
C) make complex division computing with the result after the phase compensation of step (b) and the amplitude compensation value of step (a), complete
Amplitude Compensation, the base band data of the super large bandwidth after finally being compensated；
D) judgment step (1) is believed from the type of radar collection super large bandwidth signal if gathering super large bandwidth from radar
Number it is baseband signal, then FPGA is mended the base band data of the super large bandwidth after step (c) finally compensation by DAC outputs
Baseband signal after repaying；
If be intermediate-freuqncy signal from radar collection super large bandwidth signal, FPGA step (c) is finally compensated after super large
The base band data of bandwidth carries out Digital Up Convert, the intermediate-freuqncy signal after being then compensated by DAC outputs；
If being radiofrequency signal from radar collection super large bandwidth signal, step (e) is performed；
E) local oscillation signal of the intermediate-freuqncy signal after the compensation for obtaining step (d) and radar is mixed, penetrating after being compensated
Frequency signal.
The highest frequency of the collecting device of step (1) the collection super large bandwidth signal needs to be more than the super large bandwidth signal
Highest frequency, gather super large bandwidth signal collecting device maximum sample rate be more than the super large bandwidth signal bandwidth 2
Times.
The present invention has the advantages that compared with prior art：
(1) present invention by step (1)~step (7) according to the amplitude distortion characteristics of super large bandwidth signal generation system and
Phase distortion characteristic, extracts the amplitude distortion parameter and phase distortion parameter related to its distortion, and the quantity of parameter exists substantially
Individual position magnitude；Full wave shape compared to conventional method stores (number of parameters is thousands of) and high-order predistortion filter (number of parameters
It is up to a hundred), number of parameters of the invention is extremely reduced, and method is simpler, and easily operated；
(2) present invention enters the related amplitude distortion parameter and phase of line distortion by step (8) with simple multiplication and division computing
Position parameter injection, completes compensation, compared to the filtering operation of conventional method, operand greatly reduces, and speed is faster.
(3) step (8) of the invention can be achieved using FPGA with less resource, need great Rong compared to conventional method
Memory or big quantity multiplier are measured, realizes that simply resource consumption is few, is used suitable for miniaturization, lightness equipment.
Brief description of the drawings
Fig. 1 is the compensation flow chart of the embodiment of the present invention 1；
Fig. 2 is the oscillogram of the non-thermal compensation signal of the embodiment of the present invention 1；
Fig. 3 is the amplitude schematic diagram of the non-thermal compensation signal of the embodiment of the present invention 1；
Fig. 4 is the phase schematic diagram of the non-thermal compensation signal of the embodiment of the present invention 1；
Fig. 5 is the phase error schematic diagram of the non-thermal compensation signal of the embodiment of the present invention 1；
Fig. 6 is that the embodiment of the present invention 1 compensation method step (8) realizes block diagram；
Fig. 7 be the embodiment of the present invention 1 compensation after signal amplitude schematic diagram；
Fig. 8 be the embodiment of the present invention 1 compensation after signal phase error schematic diagram.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
Using the inventive method to duration 20us, centre frequency is in 1.8GHz, bandwidth 1GHz super large bandwidth intermediate frequency
Signal compensates.According to shown in Fig. 1, specific implementation process is as follows：
(1) super large bandwidth signal gathers
Intermediate-freuqncy signal is acquired with oscillograph, oscillograph is set with a width of 16GHz, sample rate 12.5GHz, is collected
Signal it is as shown in Figure 2.
(2) gathered data down coversion
Gathered data is subjected to Digital Down Convert, base band is transformed to from 1.8GHz.
(3) amplitude and phase calculation of theoretical value
Centre frequency is calculated in 1.8GHz, the theoretical value of the baseband signal of bandwidth 1GHz super large bandwidth signal0≤n<250000。
(4) amplitude and phase calculation of gathered data
The measured value of the baseband signal of step (2) is expressed as complex signal form, its amplitude B [n] is as shown in figure 3, phase theta
[n] is as shown in Figure 4, it can be seen that the amplitude scintillation of non-thermal compensation signal has 0.026V, and phase error is between [- 80 °, 40 °].
(5) amplitude distortion is calculated
Amplitude distortion F [n]=B [n]/A [n]=B [n] is calculated, as shown in Figure 3.
(6) phase distortion is calculated
Calculate phase distortionAs shown in Figure 5.
(7) amplitude distortion and phase distortion parameter are extracted
Systematic distortion characteristic is fitted using the mode of fitting of a polynomial plus sine wave fitting, following table is obtained and reaches
Formula：
F [n] '=0.0353+1.97 × 10-7×n-1.02×10-12×n2+1.45×10-18×n3, wherein multinomial intend
The number of conjunction takes 3, and the sinusoidal frequency number of sine wave fitting takes 0.
δ [n] '=- 66.88+0.0031 × n-3.33 × 10-8×n2-1.18×10-13×n3-1.15×10-19×n4, its
The number of middle fitting of a polynomial takes 4, and the sinusoidal frequency number of sine wave fitting takes 0.
(8) distortion parameter is substituted into theoretical value and completes compensation calculation
Super large bandwidth signal base after distortion parameter injection ultra-wide band signal baseband data in step (7) are compensated
Band dataComplete compensation.
It is used in above-mentioned in super large bandwidth signal pre-distortion compensated method, step (8) adds DAC to realize with FPGA, realizes
Block diagram is as shown in fig. 6, concrete methods of realizing is as follows：
A) the theoretical value a [n] of initial data computing module elder generation calculation procedure (3) baseband signal gives complex multiplier, together
Shi Xiangwei compensation value calculations module carries out phase compensation value calculating and gives cos (*) modules and sin (*) module, amplitude compensation value meter
Calculate module progress amplitude compensation value calculating and give complex divider.
B) cos (*) modules and sin (*) modules ask for cos (*) and sin (*) to the result of phase compensation value computing module
Value, give complex multiplier；Complex multiplier is by the result of initial data computing module and cos (*) modules and sin (*) mould
Block, which is multiplied, gives complex divider completion phase compensation, obtains the base band data of the super large bandwidth after phase compensation；
C) result after the phase compensation that complex divider is sent with complex multiplier and amplitude compensation value computing module are sent
The amplitude compensation value come makees complex division computing, is then passed to digital up converter, Amplitude Compensation is completed, after finally being compensated
Super large bandwidth base band data；
D) digital up converter receives the base band data for the super large bandwidth that complex divider is sent, and carries out Digital Up Convert meter
The intermediate frequency data of the super large bandwidth after finally being compensated is calculated, the intermediate-freuqncy signal after being then compensated by DAC outputs；
As shown in Figure 7, Figure 8, amplitude scintillation drops to 0.001V for the amplitude spectrum of signal and phase error after compensation, and phase is missed
Difference drops between [- 1 °, 6 °], and the amplitude scintillation for contrasting non-thermal compensation signal has 0.026V, and phase error is located at [- 80 °, 40 °]
Between, amplitude improves 26 times, and phase error section reduces 17 times, and compensation effect is obvious.
For radar system, non-thermal compensation signal adds the peak sidelobe ratio of hamming window pulse pressure results to be -24dB, mends
Repaying rear signal adds the peak sidelobe ratio of hamming window pulse pressure results to be -42dB, and systematic function improves 18dB, positive effect.
It is described above, it is only the optimal embodiment of the present invention, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.
The content not being described in detail in description of the invention belongs to the known technology of professional and technical personnel in the field.
Claims (3)
1. a kind of super large bandwidth signal pre-distortion compensated method based on parameter fitting, it is as follows that its feature includes step：
(1) super large bandwidth signal is gathered from radar, the super large bandwidth signal is judged, if the super large bandwidth signal is intermediate frequency
Or radiofrequency signal, then the intermediate frequency or radiofrequency signal all the way are gathered, into step (2)；If the super large bandwidth signal is baseband signal,
The I roads of the baseband signal and the data on Q roads then are gathered simultaneously, into step (3)；
(2) Digital Down Convert processing is carried out to the intermediate frequency or radiofrequency signal of step (1) collection, obtains the baseband signal after down coversion
I roads and Q roads two paths of data, into step (3)；
(3) theoretical value of the baseband signal of step (1) or step (2) is set0
≤n<N, N are the collection points in the whole collection duration, and A [n] is the theory of the baseband signal of step (1) or step (2)
The amplitude of value,For step (1) or the phase of the theoretical value of the baseband signal of step (2)；
(4) measured value of step (1) or the baseband signal of step (2) is expressed as complex signal form b [n]=B [n] ejθ[n], 0≤
n<N, B [n] is the amplitude of the measured value of the baseband signal of step (1) or step (2) in formula, and θ [n] is step (1) or step (2)
Baseband signal measured value phase；
(5) according to the A [n] of the B [n] of step (4) and step (3), the generation system of the super large bandwidth signal of calculation procedure (1),
That is radar, amplitude distortion characteristics F [n], formula is as follows：
F [n]=B [n]/A [n]；
(6) according to the θ [n] of step (4) and step (3)The generation system of the super large bandwidth signal of calculation procedure (1)
Phase distortion characteristic δ [n], formula is as follows：
(7) width of the mode of sine wave fitting to the generation system of the super large bandwidth signal of step (5) is added using fitting of a polynomial
Degree distorted characteristic F [n] is fitted, and obtains following formula F [n] '：
In formula, M1For the number of fitting of a polynomial, N1For the sinusoidal frequency number of sine wave fitting,What it is for fitting of a polynomial is
Number,For the amplitude of sine wave fitting,For the frequency of sine wave fitting,For the phase of sine wave fitting；
The phase distortion characteristic δ [n] of the system of step (6) is intended using the mode of fitting of a polynomial plus sine wave fitting
Close, obtain following formula δ [n] '：
M in formula2For the number of fitting of a polynomial, N2For the sinusoidal frequency number of sine wave fitting,What it is for fitting of a polynomial is
Number,For the amplitude of sine wave fitting,For the frequency of sine wave fitting,For the phase of sine wave fitting；
(8) F [n] ' of step (7) and δ [n] ' are injected into the theoretical value of the baseband signal of step (3), it is super after being compensated
The base band data a ' [n] of big bandwidth signal, complete super large bandwidth signal pre-distortion compensated and calculate, formula is as follows：
2. a kind of super large bandwidth signal pre-distortion compensated method based on parameter fitting according to claim 1, its feature
It is：The method that step (8) FPGA adds digital analog converter DAC to realize is as follows：
A) the theoretical value a [n] of FPGA elder generations calculation procedure (3) baseband signal, while FPGA carries out a [n] phase compensation value calculating
Calculated with amplitude compensation value, obtain phase compensation value δ [n] ' and amplitude compensation value F [n] '；
B) ask for cos (*) and sin (*) value to the phase compensation value δ [n] ' of step (a), and with the theoretical value a of baseband signal
[n] carries out complex multiplication operation, completes phase compensation, obtains the base band data of the super large bandwidth after phase compensation；
C) make complex division computing with the result after the phase compensation of step (b) and the amplitude compensation value of step (a), complete amplitude
Compensation, the base band data of the super large bandwidth after finally being compensated；
D) judgment step (1) is if gathering super large bandwidth signal from radar from the type of radar collection super large bandwidth signal
Baseband signal, then after the base band data of the super large bandwidth after step (c) finally compensation is compensated by FPGA by DAC outputs
Baseband signal；
If be intermediate-freuqncy signal from radar collection super large bandwidth signal, FPGA step (c) is finally compensated after super large bandwidth
Base band data carry out Digital Up Convert, then by DAC output i.e. be compensated after intermediate-freuqncy signal；
If be radiofrequency signal from radar collection super large bandwidth signal, FPGA step (c) is finally compensated after super large bandwidth
Base band data carry out Digital Up Convert, then by DAC output i.e. be compensated after intermediate-freuqncy signal, perform step (e)；
E) local oscillation signal of the intermediate-freuqncy signal after the compensation for obtaining step (d) and radar is mixed, the radio frequency letter after being compensated
Number.
3. a kind of super large bandwidth signal pre-distortion compensated method based on parameter fitting according to claim 1, its feature
It is：The highest frequency of the collecting device of step (1) the collection super large bandwidth signal is needed more than the super large bandwidth signal
Highest frequency, the maximum sample rate of the collecting device of collection super large bandwidth signal are more than 2 times of the bandwidth of the super large bandwidth signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510536421.0A CN105242242B (en) | 2015-08-27 | 2015-08-27 | A kind of super large bandwidth signal pre-distortion compensated method based on parameter fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510536421.0A CN105242242B (en) | 2015-08-27 | 2015-08-27 | A kind of super large bandwidth signal pre-distortion compensated method based on parameter fitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105242242A CN105242242A (en) | 2016-01-13 |
| CN105242242B true CN105242242B (en) | 2017-12-19 |
Family
ID=55039950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510536421.0A Active CN105242242B (en) | 2015-08-27 | 2015-08-27 | A kind of super large bandwidth signal pre-distortion compensated method based on parameter fitting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105242242B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109474285A (en) * | 2018-12-19 | 2019-03-15 | 航天恒星科技有限公司 | A method of pretreatment DAC causes with interior uneven processing |
| CN112332850A (en) * | 2020-09-15 | 2021-02-05 | 北京无线电测量研究所 | Broadband waveform compensation equipment and method based on FPGA |
| CN113567939B (en) * | 2021-05-17 | 2024-05-10 | 陕西航天技术应用研究院有限公司 | Predistortion compensation method, module and receiving and transmitting system of synthetic aperture radar system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6535560B1 (en) * | 1999-06-03 | 2003-03-18 | Ditrans Corporation | Coherent adaptive calibration system and method |
| CN102045278B (en) * | 2010-12-31 | 2013-05-08 | 成都芯通科技股份有限公司 | Preprocessing method for base band signal |
| CN104267385B (en) * | 2014-10-16 | 2016-09-21 | 中国科学院电子学研究所 | There is the LFM waveforms generator of predistortion function |
| CN104657287A (en) * | 2015-02-12 | 2015-05-27 | 成都大公博创信息技术有限公司 | Novel data caching system and caching method for broadband receiver |
-
2015
- 2015-08-27 CN CN201510536421.0A patent/CN105242242B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105242242A (en) | 2016-01-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103630743B (en) | The method of a kind of heterodyne system spectrum analyzer frequency correction | |
| CN104122444B (en) | All-digital IF spectrum analyzer and frequency spectrum analysis method | |
| CN105242242B (en) | A kind of super large bandwidth signal pre-distortion compensated method based on parameter fitting | |
| CN101702018A (en) | Calibrating method for big modulation bandwidth linear FM signal frequency response | |
| CN103675767B (en) | A kind of ultra wide band low power radiofrequency signal generator and method thereof | |
| CN103926462B (en) | Rapid harmonic wave analyzing method and device of power system | |
| CN102109553B (en) | Digital spectrum analyzer and method for fast positioning of measuring signals | |
| CN104181577A (en) | Beam position and phase measurement system and method based on full digitalization technology | |
| CN107239611B (en) | Vector signal analysis device and method | |
| CN103973324A (en) | Broadband digital receiver and real-time frequency spectrum processing method thereof | |
| CN103117972B (en) | A kind of Vector Signal Analysis method and apparatus | |
| CN105487034A (en) | 0.05-level electronic transformer verification method and system | |
| CN103513232A (en) | Fuze body object simulation method and system | |
| CN102723931A (en) | Wide-dynamic high-accuracy and edge time adjustable impulse wave producing method | |
| CN103983849A (en) | Real-time high-accuracy power harmonic analysis method | |
| CN105486920A (en) | Narrow pulse frequency measurement method based on digital channelization technology | |
| CN202019349U (en) | Multipath parallel high-speed analog/digital (A/D) sampling circuit board based on low cost | |
| CN103969508A (en) | Real-time high-precision power harmonic analysis method and device | |
| CN103809024A (en) | FPGA-based real-time spectral analysis system | |
| CN202502168U (en) | Phase noise measuring device | |
| CN101799534B (en) | Radar intermediate-frequency signal generator | |
| CN104320093B (en) | A kind of method of stabilizing amplifier | |
| CN103067105B (en) | Doppler frequency shift test device, the method for Doppler frequency shift device and communication module | |
| CN203399086U (en) | Frequency source based on DDS harmonic wave extraction technique | |
| CN106972833A (en) | It is a kind of can any multiple resampling digital up converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |