CN106130568A - A kind of demodulation analysis method processed based on dual pathways parallel data - Google Patents
A kind of demodulation analysis method processed based on dual pathways parallel data Download PDFInfo
- Publication number
- CN106130568A CN106130568A CN201610353302.6A CN201610353302A CN106130568A CN 106130568 A CN106130568 A CN 106130568A CN 201610353302 A CN201610353302 A CN 201610353302A CN 106130568 A CN106130568 A CN 106130568A
- Authority
- CN
- China
- Prior art keywords
- data
- signal
- dual pathways
- analysis method
- processed based
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
- H04B1/0021—Decimation, i.e. data rate reduction techniques
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
- H04B1/0017—Digital filtering
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
- H04B1/0039—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage using DSP [Digital Signal Processor] quadrature modulation and demodulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
- H04B1/0042—Digital filtering
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
- H04B1/0046—Decimation, i.e. data rate reduction techniques
Abstract
The present invention proposes a kind of demodulation analysis method processed based on dual pathways parallel data, platform based on spectrum analyzer, completed to carry the I/Q data of dual pathways parallel processing to ARM interface by FPGA, then realize demodulating data analysis at ARM end, and show radio frequency collection of illustrative plates, audio volume control, audible spectrum.What the present invention proposed uses the demodulation analysis method processed based on dual pathways parallel data, radio frequency collection of illustrative plates, audio volume control, audible spectrum can be generated simultaneously, and radio frequency collection of illustrative plates uses different data paths from audio volume control, audible spectrum, both resolution bandwidths and sample rate arrange separate not interfereing with each other, and user can be from the quality of multiple dimension comprehensive assessment modulated signals.
Description
Technical field
The present invention relates to signal processing field, particularly to a kind of demodulation analysis side processed based on dual pathways parallel data
Method.
Background technology
The demodulation of analogue signal mainly has two ways, and one is to utilize demodulation hardware to demodulate, as special signal demodulates
Device.But the modules such as demodulator are all realized by analog circuit, there is aging, the warm drift of analog device etc. and show in analog processing circuit
As, bandwidth switching uncertainty, scale fidelity and gain uncertainty equal error can be brought to measurement, it is impossible to ensure measurement
Stability and concordance.
The method of main flow is analogue signal demodulation and the analysis method of numeral at present.Digitized analogue signal demodulation method
FPGA is mainly utilized to coordinate ARM end to complete the down coversion of intermediate-freuqncy signal, filtering extraction, FFT.The signal entering into intermediate frequency is first
First passing through A/D converter and realize the analog digital conversion of signal, digital signal generates I, Q two-way base band through the process of down conversion module
Signal.I, Q signal carry out down-sampled rate through multirate digital filter, and the extraction ratio of digital filter is according to different demodulation bands
Width is configured.I, Q signal are carried out a series of process such as envelope detection, frequency discrimination, FFT, generates the radio frequency of demodulated signal
Collection of illustrative plates, audio volume control, audible spectrum, and show, calculate demodulated signal parameter, as percentage modulation modulation rate, modulation are lost simultaneously
True etc..
The data that radio frequency collection of illustrative plates, audio volume control, audible spectrum use are through same group of digital filter, so three's divides
Resolution bandwidth is consistent with sample rate.In order to obtain best demodulation result, demonstrate audio volume control, audible spectrum, just need
Resolution bandwidth and the sample rate of wanting stationary digital wave filter are optimum, and user wishes to regulate the resolution bandwidth of radio frequency collection of illustrative plates
Testing modulated signal, change resolution bandwidth influences whether audio volume control, audible spectrum comprehensively, and resolution bandwidth is the least can be by
Demodulated signal filters so that audio volume control, audible spectrum can not show demodulated signal；Resolution bandwidth too conference makes interference signal
Entering, interference tones waveform and audible spectrum, this contradiction brings very big inconvenience to demodulation analysis.
Summary of the invention
The present invention propose a kind of based on dual pathways parallel data process demodulation analysis method, solve the technical problem that be as
What shows demodulation result the most intuitively, galore, user-friendly.
The technical scheme is that and be achieved in that:
A kind of demodulation analysis method processed based on dual pathways parallel data, platform based on spectrum analyzer, by FPGA
Complete to carry the I/Q data of dual pathways parallel processing to ARM interface, then realize demodulating data analysis at ARM end, and display is penetrated
Frequently collection of illustrative plates, audio volume control, audible spectrum.
Alternatively, intermediate-freuqncy signal initially enters frequency overlapped-resistable filter, filters the frequency signal producing aliasing, then adopts through AD
Sample is converted into digital signal, and the data quantified through AD are input to FPGA, utilize Digital Down Converter Module by signal decomposition for I and
Q component, I/Q data is divided two-way again, respectively through two groups of different decimation filters filtering, is finally sent in ARM by FPGA.
Alternatively, the resolution bandwidth of radio frequency collection of illustrative plates and audible spectrum is arranged is separate: arrange radio frequency collection of illustrative plates
Resolution bandwidth correspondence controls the extraction ratio of the first decimation filter, and the resolution bandwidth correspondence arranging audible spectrum controls second
The extraction ratio of decimation filter.
Alternatively, described two groups of I/Q data enter ARM Hou Fen tri-road and process simultaneously, generate radio spectrum, sound respectively
Frequently waveform, audible spectrum.
Alternatively, first group of I/Q data is directly done FFT, and generate radio-frequency chart modal data after detection or interpolation, use
Signal spectrum before test demodulation.
Alternatively, FFT count and coefficient adjust accordingly according to the resolution bandwidth of user setup.
Alternatively, second group of I/Q data is used to demodulate and generate audio volume control and audible spectrum to AM signal and FM signal.
Alternatively, if AM signal, first I/Q data is done envelope detection, divide because the signal after envelope detection contains direct current
Amount, therefore need every directly going DC component, ultimately generate AM audio volume control；
To doing FFT, detection or interpolation through envelope detection with every straight signal, generate AM audible spectrum.
Alternatively, if FM signal, first the ratio arctangent cp cp operation to IQ component, obtains instantaneous phase value, to instantaneous
Phase value is differentiated, and tries to achieve the phase contrast of former and later two sampled points according to sampled data before and after I, Q two-way, then during divided by sampled point
Between be spaced and i.e. can get original modulated signal；
FM audio signal after demodulation is done FFT, detection or interpolation, generates FM audible spectrum.
The invention has the beneficial effects as follows:
(1) radio frequency collection of illustrative plates, audio volume control, audible spectrum can be generated simultaneously；
(2) and radio frequency collection of illustrative plates and audio volume control, audible spectrum use different data paths, both resolution bandwidths and
Sample rate arranges separate not interfereing with each other；
(3) user can be from the quality of multiple dimension comprehensive assessment modulated signals.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the theory diagram of a kind of demodulation analysis method processed based on dual pathways parallel data of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
The demodulation of analogue signal experienced by and demodulates from application specific demodulator of PM signal PM, carries out digital solution to by FPGA, DSP
The evolution adjusted.At present carry out the method for digital demodulation by FPGA, DSP to have that display interface is directly perceived the most not comprehensively, operate
The shortcomings such as complexity.Show demodulation result the most intuitively, galore, user-friendly present invention mainly solves
Technical problem.
The invention provides a kind of demodulation analysis method processed based on dual pathways parallel data, generation can be calculated simultaneously
Radio frequency collection of illustrative plates, audio volume control, audible spectrum, and the resolution bandwidth of radio frequency collection of illustrative plates and sample rate arrange and audio volume control, audio frequency
The resolution bandwidth of frequency spectrum and sample rate arrange separate not interfereing with each other, and user can be from multiple dimension comprehensive assessment modulation letter
Number quality.
The method platform based on spectrum analyzer of the present invention, is completed to carry the I/Q data of dual pathways parallel processing by FPGA
To the interface of ARM, then realize demodulating data analysis at ARM end by software.The demodulation of analogue signal is broadly divided into analysis
Two parts work: FPGA portion obtains the I/Q data of dual pathways parallel processing, and ARM part calculates modulation parameter, and shows radio frequency
Collection of illustrative plates, audio volume control, audible spectrum.
As it is shown in figure 1, intermediate-freuqncy signal initially enters frequency overlapped-resistable filter, filter the frequency signal producing aliasing, then warp
AD sampling is converted into digital signal.The data quantified through AD are input to FPGA, utilize Digital Down Converter Module by signal decomposition
For I and Q component, I/Q data is divided two-way again, respectively through two groups of different decimation filters filtering, is finally sent into ARM by FPGA
In.It is separate that the resolution bandwidth of radio frequency collection of illustrative plates and audible spectrum is arranged: arrange the resolution bandwidth pair of radio frequency collection of illustrative plates
Should control the extraction ratio of the first decimation filter 1, the resolution bandwidth correspondence arranging audible spectrum controls the second decimation filter 2
Extraction ratio, thus can avoid the conflict of radio frequency collection of illustrative plates and audible spectrum.
Two groups of I/Q data enter ARM Hou Fen tri-road and process simultaneously, generate radio spectrum, audio volume control, audio frequency respectively
Frequency spectrum.
First group of I/Q data is directly done FFT, and generates radio-frequency chart modal data after detection or interpolation, be used for testing solution
Signal spectrum before tune.Count and the coefficient of FFT adjust accordingly according to the resolution bandwidth of user setup.
AM signal and FM signal are demodulated and generate audio volume control and audible spectrum uses second group of I/Q data.
If AM signal, first I/Q data is done envelope detection, i.e.Because the signal after envelope detection contains directly
Flow component, therefore need every directly going DC component, ultimately generate AM audio volume control.To doing through envelope detection with every straight signal
FFT, detection or interpolation, generate AM audible spectrum.The audible spectrum that can set according to user with coefficient of counting of FFT
Resolution bandwidth adjusts accordingly.
If FM signal, according to the ultimate principle of FM demodulation, first the ratio arctangent cp cp operation to IQ component, obtains instantaneous
Phase value, i.e. phase demodulation:Instantaneous phase value is differentiated, before before and after I, Q two-way, sampled data is tried to achieve
The phase contrast of latter two sampled point, i.e. difference, more i.e. can get original modulated signal divided by sampled point time interval.After demodulation
FM audio signal do FFT, detection or interpolation, generate FM audible spectrum.
The demodulation analysis method processed based on dual pathways parallel data of the present invention is permissible while generating three collection of illustrative plates
Calculate each modulation parameter, such as carrier power, modulation rate, percentage modulation modulation distortion, harmonic distortion etc..
The present invention proposes to use the demodulation analysis method processed based on dual pathways parallel data, can generate radio-frequency chart simultaneously
Spectrum, audio volume control, audible spectrum, and radio frequency collection of illustrative plates and audio volume control, audible spectrum use different data paths, both point
Resolution bandwidth and sample rate arrange separate not interfereing with each other, and user can be from the matter of multiple dimension comprehensive assessment modulated signals
Amount.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (9)
1. the demodulation analysis method processed based on dual pathways parallel data, it is characterised in that based on spectrum analyzer flat
Platform, by FPGA complete carry dual pathways parallel processing I/Q data to ARM interface, then realize demodulating data analysis at ARM end,
And show radio frequency collection of illustrative plates, audio volume control, audible spectrum.
2. the demodulation analysis method processed based on dual pathways parallel data as claimed in claim 1, it is characterised in that intermediate frequency is believed
Number initially enter frequency overlapped-resistable filter, filter the frequency signal producing aliasing, be then converted into digital signal through AD sampling, pass through
The data that AD quantifies are input to FPGA, and utilizing Digital Down Converter Module is I and Q component by signal decomposition, and I/Q data divides two-way again,
Respectively through two groups of different decimation filters filtering, finally sent in ARM by FPGA.
3. the demodulation analysis method processed based on dual pathways parallel data as claimed in claim 2, it is characterised in that radio-frequency chart
It is separate for composing with the setting of the resolution bandwidth of audible spectrum: arrange the corresponding control first of resolution bandwidth of radio frequency collection of illustrative plates
The extraction ratio of decimation filter, the resolution bandwidth correspondence arranging audible spectrum controls the extraction ratio of the second decimation filter.
4. the demodulation analysis method processed based on dual pathways parallel data as claimed in claim 2, it is characterised in that described two
Group I/Q data enters ARM Hou Fen tri-road and processes simultaneously, generates radio spectrum, audio volume control, audible spectrum respectively.
5. the demodulation analysis method processed based on dual pathways parallel data as claimed in claim 4, it is characterised in that to first
Group I/Q data directly does FFT, and generates radio-frequency chart modal data after detection or interpolation, the signal frequency before testing demodulation
Spectrum.
6. the demodulation analysis method processed based on dual pathways parallel data as claimed in claim 5, it is characterised in that FFT becomes
Count and the coefficient that change adjust accordingly according to the resolution bandwidth of user setup.
7. the demodulation analysis method processed based on dual pathways parallel data as claimed in claim 4, it is characterised in that use the
Two groups of I/Q data demodulate and generate audio volume control and audible spectrum to AM signal and FM signal.
8. the demodulation analysis method processed based on dual pathways parallel data as claimed in claim 7, it is characterised in that if AM
Signal, first does envelope detection to I/Q data, because the signal after envelope detection contains DC component, therefore needs every directly going direct current to divide
Amount, ultimately generates AM audio volume control；
To doing FFT, detection or interpolation through envelope detection with every straight signal, generate AM audible spectrum.
9. the demodulation analysis method processed based on dual pathways parallel data as claimed in claim 7, it is characterised in that if FM
Signal, first the ratio arctangent cp cp operation to IQ component, obtains instantaneous phase value, differentiates instantaneous phase value, according to I, Q two
Before and after road, sampled data tries to achieve the phase contrast of former and later two sampled points, more i.e. can get raw modulation divided by sampled point time interval
Signal；
FM audio signal after demodulation is done FFT, detection or interpolation, generates FM audible spectrum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610353302.6A CN106130568A (en) | 2016-05-19 | 2016-05-19 | A kind of demodulation analysis method processed based on dual pathways parallel data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610353302.6A CN106130568A (en) | 2016-05-19 | 2016-05-19 | A kind of demodulation analysis method processed based on dual pathways parallel data |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106130568A true CN106130568A (en) | 2016-11-16 |
Family
ID=57270787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610353302.6A Pending CN106130568A (en) | 2016-05-19 | 2016-05-19 | A kind of demodulation analysis method processed based on dual pathways parallel data |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106130568A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109870608A (en) * | 2019-02-18 | 2019-06-11 | 中电科仪器仪表有限公司 | A kind of digital phosphor frequency spectrum analysis method based on CPU+GPU framework |
| CN110261821A (en) * | 2019-07-18 | 2019-09-20 | 中电科仪器仪表有限公司 | One kind demodulating relevant time difference estimation method and device based on information |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1344478A (en) * | 1998-09-30 | 2002-04-10 | 印菲内奥技术股份有限公司 | Line terminator unit for subscriber line |
| CN101176184A (en) * | 2005-05-19 | 2008-05-07 | Mks仪器公司 | Synchronous undersampling for high-frequency voltage and current measurements |
| CN105516033A (en) * | 2015-07-23 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Analog signal demodulation and analysis method based on spectrum analyzer |
-
2016
- 2016-05-19 CN CN201610353302.6A patent/CN106130568A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1344478A (en) * | 1998-09-30 | 2002-04-10 | 印菲内奥技术股份有限公司 | Line terminator unit for subscriber line |
| CN101176184A (en) * | 2005-05-19 | 2008-05-07 | Mks仪器公司 | Synchronous undersampling for high-frequency voltage and current measurements |
| CN105516033A (en) * | 2015-07-23 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Analog signal demodulation and analysis method based on spectrum analyzer |
Non-Patent Citations (1)
| Title |
|---|
| 江炜宁: "频谱分析仪中数字中频滤波器的实现", 《理论与方法》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109870608A (en) * | 2019-02-18 | 2019-06-11 | 中电科仪器仪表有限公司 | A kind of digital phosphor frequency spectrum analysis method based on CPU+GPU framework |
| CN109870608B (en) * | 2019-02-18 | 2021-03-12 | 中电科思仪科技股份有限公司 | Digital fluorescence spectrum analysis method based on CPU + GPU architecture |
| CN110261821A (en) * | 2019-07-18 | 2019-09-20 | 中电科仪器仪表有限公司 | One kind demodulating relevant time difference estimation method and device based on information |
| CN110261821B (en) * | 2019-07-18 | 2021-12-10 | 中电科思仪科技股份有限公司 | Time difference estimation method and device based on information demodulation correlation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105516033A (en) | Analog signal demodulation and analysis method based on spectrum analyzer | |
| CN104122444B (en) | All-digital IF spectrum analyzer and frequency spectrum analysis method | |
| US20050261847A1 (en) | Display method for signal analyzer | |
| CN107976572A (en) | A kind of channelizing high-precision real Time-frequency Spectrum Analysis method and its system | |
| US8615382B2 (en) | Test and measurement instrument with common presentation of time domain data | |
| US8805313B2 (en) | Magnitude and phase response calibration of receivers | |
| CN104283625A (en) | Superheterodyne harmonic detector based on harmonic mixing | |
| CN101378263A (en) | Multi-carrier digital receiver based on digital intermediate frequency and multi-carrier digital receive method | |
| CN107425850B (en) | Dual-channel digital phase-locked amplifier for SERF (spin-exchange fiber) atomic spin gyroscope | |
| EP1813026A2 (en) | Transmitter and receiver for a wireless audio transmission system | |
| CN103973620A (en) | Full-digital FM/AM signal demodulation and analysis method | |
| CN101931765A (en) | Broadband tuner based on band pass sigma-delta and method thereof | |
| CN106130568A (en) | A kind of demodulation analysis method processed based on dual pathways parallel data | |
| CN202503522U (en) | Super heterodyne harmonic detection device | |
| CN109921863A (en) | Doppler VHF omnirange digitalization surveillance & control system and method | |
| CN111711457A (en) | Method for improving demodulation broadband through multi-channel parallel segmented demodulation mode | |
| CN102200550B (en) | Delay orthogonal digital intermediate-frequency phase discrimination method for detecting phase difference accurately | |
| CN102928665A (en) | Intermediate frequency digital spectrum analyzer and method thereof | |
| CN105471525B (en) | A kind of four-way compressed sensing digital receiver signal processing method of vector network analyzer | |
| CN107919924B (en) | System and method for improving signal-to-noise ratio of vector network analyzer receiver | |
| CN201114162Y (en) | Multi- carrier digital receiver system based on digital intermediate frequency technology | |
| US20180048500A1 (en) | Demodulator | |
| CN103647563A (en) | Anti-image-interference receiver | |
| CN109541309B (en) | Spectrum analyzer and signal processing method thereof | |
| CN106375040A (en) | Implementation method for real-time demodulation of any frequency point in frequency spectrum monitoring bandwidth based on FPGA |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161116 |