CN105049131A - Novel method and system for directly sampling radio-frequency signal based on spatial sampling - Google Patents
Novel method and system for directly sampling radio-frequency signal based on spatial sampling Download PDFInfo
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- CN105049131A CN105049131A CN201510271319.2A CN201510271319A CN105049131A CN 105049131 A CN105049131 A CN 105049131A CN 201510271319 A CN201510271319 A CN 201510271319A CN 105049131 A CN105049131 A CN 105049131A
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Abstract
The invention discloses a novel method and system for directly sampling a radio-frequency signal based on spatial sampling. One end of a transmission line is grounded or is in an open-circuit state, and the radio-frequency signal is inputted from the other end of the transmission line. The radio-frequency signal is reflected at the grounding end or the open-circuit end of the transmission line. An incident signal and a reflection signal are overlapped to generate a signal with a dynamic standing wave form structure. The transmission line is provided with a plurality of measurement points, and the measurement points are provided with signal couplers. Coupled signals are sequentially processed through a signal processing module, a detection module and an analog-digital converter, are converted into digital signals, and are transmitted to a computer for calculation, thereby obtaining the amplitude, frequency and phase information of the radio frequency signal. The method is different from a conventional AD conversion mode, employs a mode of spatial sampling to replace a mode of time sampling, can complete the direct sampling of the radio frequency signal through a conventional low-speed AD converter, and provides a new solution for the software radio technology based on the direct radio-sampling sampling.
Description
Technical field
The present invention relates to a kind of signal sampling system and method, especially relate to a kind of New-type radio-frequency signal Direct Sampling method and system based on spatial sampling.
Background technology
Radio communication is an extremely important part in Modern Communication System, is widely used in satellite communication, remote sensing, navigation, military affairs etc.Due to the difference of application scenario, there has been proposed various wireless communication standard, the modulation system of these communication standards, frequency, data format are different, lack interoperability between distinct communication standards and platform, for solving inter-communicating problem, there has been proposed the concept of software radio.
So-called software radio, construct one exactly and there is opening, standardization, modular general hardware platform, utilize A/D converter (ADC) and D/A converter (DAC) by radiofrequency signal digitlization, in numeric field software simulating various types of signal process, by corresponding software module, all kinds of radiofrequency signal is processed, and do not need to change hardware system.Although software radio has very fine prospect, but in practical application, radiofrequency signal digitlization is needed the A/D converter (ADC) of hypervelocity, due to the restriction of high-speed ADC technology, software radio can't be applied in the communication of most of upper frequency, and the frequency range system cost of applicable application also costly.
Summary of the invention
In order to solve the dependence of software and radio technique to high speed A/D conversion device (ADC), break through the bottleneck of direct RF sampling technology, the invention provides a kind of New-type radio-frequency signal Direct Sampling method and system based on spatial sampling, utilize transmission line propagation characteristic, at multiple sampled point, sampling processing is carried out to signal and obtain the amplitude of radiofrequency signal, frequency and phase information, for providing a kind of new solution based on the software and radio technique of direct RF sampling.
The technical solution used in the present invention is:
One, a kind of New-type radio-frequency signal Direct Sampling method based on spatial sampling:
1) by one end ground connection of transmission line or open circuit, other end input radio frequency signal, radiofrequency signal reflects at the earth terminal of transmission line or open end, incoming signal superposes the signal creating and have Dynamic Standing Waves waveform configuration with reflected signal, this standing wave waveform can change with the change of the amplitude of radiofrequency signal, frequency and phase place in time domain;
2) multiple measurement point is set on the transmission line, distance between adjacent measurement point is greater than 1/4 wavelength, measurement point installs signal coupler, signal coupling module multiple measurement point from transmission line is utilized to be coupled out the signal with Dynamic Standing Waves waveform configuration, the signal be coupled out is converted to digital signal through the process of signal processing module, detection module and A/D converter (ADC) successively, is transferred in computer;
3) digital signal comprising radiofrequency signal information obtained from multiple measurement point is carried out computing, finally obtain the amplitude of radiofrequency signal, frequency and phase information.
Described transmission line is the electromagnetic structure of common transport, is specially microstrip line, coaxial line, parallel double waveguide or parallel flat waveguide.
Described signal coupling module is independent capacitance, microstrip line construction electric capacity, coupler or probe.
Described step 3) specifically comprise: by spatial frequency k (t), the digital signal with shape information after detection AD conversion is changed, utilize the measurement data of synchronization different measuring point, by least square fitting wavy curve, obtain amplitude A and the spatial frequency k (t) of current time radiofrequency signal; Combine again not measurement data in the same time successively matched curve obtain the change of spatial frequency k (t) t in time, inscribe the mean value of spatial frequency k (t) when trying to achieve each
following formulae discovery is adopted to obtain frequency f again:
Wherein, v represents radiofrequency signal propagation velocity in the waveguide;
Then following formula is calculated and right
about not integration addition in the same time, finally obtain the phase place of radiofrequency signal
Wherein, t represents the time.
Two, a kind of New-type radio-frequency signal Direct Sampling system based on spatial sampling:
Comprise transmission line, signal coupling module, signal processing module, detection module and A/D converter (ADC), transmission line one end is as the input of radiofrequency signal, other end short circuit or open circuit, radiofrequency signal reflects at the earth terminal of transmission line or open end, transmission line is provided with multiple measurement point, distance between adjacent measurement point is greater than 1/4 wavelength, measurement point is all provided with signal coupler, and signal coupler is connected to computer successively after signal processing module, detection module and A/D converter.
Described transmission line is the electromagnetic structure of common transport, is specially microstrip line, coaxial line, parallel double waveguide or parallel flat waveguide.
Described signal coupling module is independent capacitance, microstrip line construction electric capacity, coupler or probe.
The beneficial effect that the present invention has is:
The Dynamic Standing Waves waveform configuration waveform that the present invention utilizes radiofrequency signal to transmit on ground connection (or open circuit) transmission line and formed, a kind of New-type radio-frequency signal Direct Sampling system and method based on spatial sampling is provided, be applicable to the more modulation radiofrequency signals such as AM, FM, PSK, MSK, QAM, utilize native system that radiofrequency signal is converted into digital signal, then utilize algorithm directly to obtain the amplitude of radiofrequency signal, frequency and phase information at computer.
Further radiofrequency signal Direct Sampling system and method for the present invention can be applicable to the radiofrequency signal of all kinds of different frequency simultaneously, the highlyest can reach the Terahertz order of magnitude, overcomes current software radio because of ADC technical limitations and cannot reach the shortcoming of upper frequency.
Further radiofrequency signal Direct Sampling system and method for the present invention is not owing to adopting A/D converter (ADC) technology at a high speed, and system cost declines to a great extent.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of present system.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, sampling system of the present invention comprises transmission line, signal coupling module, signal processing module, detection module and A/D converter (ADC), transmission line one end is as the input of radiofrequency signal, other end short circuit or open circuit, radiofrequency signal reflects at the earth terminal of transmission line or open end, transmission line is provided with multiple measurement point, distance between adjacent measurement point is greater than 1/4 wavelength, measurement point is all provided with signal coupler, and signal coupler is connected to computer successively after signal processing module, detection module and A/D converter.
Multiple measurement point is set on the transmission line, utilize signal coupler by signal from transmission line coupling out, the signal be coupled out is successively through signal processing module, detection module and conventional low rate A/D converter (ADC), after finally the multiply digital signals changed being passed through calculating, obtain the amplitude of radiofrequency signal, frequency and phase information.
The method of sampling of the present invention specifically comprises:
1) by one end ground connection of transmission line or open circuit, other end input radio frequency signal, radiofrequency signal reflects at the earth terminal of transmission line or open end, incoming signal superposes the signal creating and have Dynamic Standing Waves waveform configuration with reflected signal, this standing wave waveform can change with the change of the amplitude of radiofrequency signal, frequency and phase place in time domain;
2) multiple measurement point is set on the transmission line, distance between adjacent measurement point is greater than 1/4 wavelength, measurement point installs signal coupler, signal coupling module multiple measurement point from transmission line is utilized to be coupled out the signal with Dynamic Standing Waves waveform configuration, the signal be coupled out is converted to digital signal through the process of signal processing module, detection module and A/D converter (ADC) successively, is transferred in computer;
3) digital signal comprising radiofrequency signal information obtained from multiple measurement point is processed, finally obtain the amplitude of radiofrequency signal, frequency and phase information.
Transmission line of the present invention is the electromagnetic structure of common transport, is specially microstrip line, coaxial line, parallel double waveguide or parallel flat waveguide.
Signal coupling module of the present invention is independent capacitance, microstrip line construction electric capacity, coupler or probe, can be coupled out small-signal from transmission line and not affect the conduction of ripple on former transmission line.Signal processing module inside comprises filter, radio frequency signal amplifiers, amplifying signal while filtering noise, is convenient to the work of detection module and conventional low rate A/D converter (ADC).
The signal with Dynamic Standing Waves waveform configuration that the present invention utilizes radiofrequency signal to transmit on ground connection (or open circuit) transmission line and formed completes Direct Sampling task, this Direct Sampling system can be applicable to the communication of all kinds of different frequency simultaneously, has the frequency band of non-constant width.
Embodiment and the detailed process thereof of the inventive method are as follows:
With sampling in embodiment
radiofrequency signal is example, and wherein A is amplitude, and π is circumference ratio, and f is frequency, and t represents the moment,
represent phase place.As shown in Figure 1, by one end ground connection of rectangular waveguide, other end conduct
the input of radiofrequency signal.This radiofrequency signal reflects at the earth terminal of transmission line, and incoming signal superposes the signal creating and have Dynamic Standing Waves waveform configuration with reflected signal, and standing wave waveform can with amplitude A in time domain, frequency f and phase place
change and change.
The incident waveform y of this radiofrequency signal
1can be expressed as:
Wherein, l represents the distance of measurement point to earth terminal, and v represents radiofrequency signal propagation velocity in the waveguide.
Through the waveform y of rectangular waveguide earth terminal reflection
2can be expressed as:
Incoming signal superposes the signal y creating and have Dynamic Standing Waves waveform configuration with reflected signal
3be:
Probe is utilized to be coupled out the signal y of this Dynamic Standing Waves waveform configuration from the multiple measurement points waveguide
3, then through signal processing module, filtering and amplification are carried out to signal, then by detection module, detection are carried out to this waveform, waveform y after detection
4just become:
Then use conventional low rate A/D converter (ADC) to the y after detection
4waveform is sampled, by different measuring point y
4the time dependent information of maximum amplitude of waveform is changed to digital signal, is transferred in computer.
When the digital signal comprising radiofrequency signal amplitude, frequency and phase information obtained from multiple measurement point being processed, make spatial frequency
signal then after detection can be expressed as:
y
5＝2|Asin(lk(t))|(5)
Utilize the measurement data of synchronization difference, use least square method can obtain the value of A and k (t) of current time rf wave by matching wavy curve, so far obtained the amplitude A of radiofrequency signal, then in conjunction with different time points measurement data successively matched curve obtain the change of k (t) t in time.Then the spatial frequency mean value of the k (t) of each time point is obtained
then can obtain:
According to (6) formula, the frequency f of radiofrequency signal can be obtained, in addition can be right
be added about the continuous integration of different time, finally obtain the phase place of radiofrequency signal
the amplitude A obtained before adding, successfully obtains radiofrequency signal
amplitude, frequency and phase information.
Thus, the Dynamic Standing Waves waveform configuration waveform that the present invention utilizes radiofrequency signal to transmit on ground connection (or open circuit) transmission line and formed, calculates the amplitude of radiofrequency signal, frequency and phase information; Be applicable to the radiofrequency signal of all kinds of different frequency, cost is low, can reach the Terahertz order of magnitude, overcomes current software radio and cannot reach the shortcoming of upper frequency because of ADC technical limitations, have significant technique effect.
Claims (7)
1., based on a New-type radio-frequency signal Direct Sampling method for spatial sampling, it is characterized in that:
1) by one end ground connection of transmission line or open circuit, other end input radio frequency signal, radiofrequency signal reflects at the earth terminal of transmission line or open end, incoming signal superposes the signal creating and have Dynamic Standing Waves waveform configuration with reflected signal, this standing wave waveform can change with the change of the amplitude of radiofrequency signal, frequency and phase place in time domain;
2) multiple measurement point is set on the transmission line, distance between adjacent measurement point is greater than 1/4 wavelength, measurement point installs signal coupler, signal coupling module multiple measurement point from transmission line is utilized to be coupled out the signal with Dynamic Standing Waves waveform configuration, the signal be coupled out is converted to digital signal through the process of signal processing module, detection module and A/D converter successively, is transferred in computer;
3) digital signal comprising radiofrequency signal information obtained from multiple measurement point carries out computing, finally obtains the amplitude of radiofrequency signal, frequency and phase information.
2. a kind of New-type radio-frequency signal Direct Sampling method based on spatial sampling according to claim 1, is characterized in that: described transmission line is microstrip line, coaxial line, parallel double waveguide or parallel flat waveguide.
3. a kind of New-type radio-frequency signal Direct Sampling method based on spatial sampling according to claim 1, is characterized in that: described signal coupling module is independent capacitance, microstrip line construction electric capacity, coupler or probe.
4. a kind of New-type radio-frequency signal Direct Sampling method based on spatial sampling according to claim 1, it is characterized in that: described step 3) specifically comprise: by spatial frequency k (t), the digital signal with waveform signal after detection and AD conversion is changed, utilize the measurement data of synchronization different measuring point, by least square fitting wavy curve, obtain amplitude A and the spatial frequency k (t) of current time radiofrequency signal;
Combine again not measurement data in the same time successively matched curve obtain the change of spatial frequency k (t) t in time, inscribe the mean value of spatial frequency k (t) when trying to achieve each
following formulae discovery is adopted to obtain frequency f again:
Wherein, v represents radiofrequency signal propagation velocity in the waveguide;
Then following formula is calculated and right
about not integration addition in the same time, finally obtain the phase place of radiofrequency signal
Wherein, t represents the time.
5. the New-type radio-frequency signal Direct Sampling system based on spatial sampling, it is characterized in that: comprise transmission line, signal coupling module, signal processing module, detection module and A/D converter (ADC), transmission line one end is as the input of radiofrequency signal, other end short circuit or open circuit, radiofrequency signal reflects at the earth terminal of transmission line or open end, transmission line is provided with multiple measurement point, distance between adjacent measurement point is greater than 1/4 wavelength, measurement point is all provided with signal coupler, signal coupler is successively through signal processing module, computer is connected to after detection module and A/D converter.
6. a kind of New-type radio-frequency signal Direct Sampling system based on spatial sampling according to claim 5, is characterized in that: described transmission line is microstrip line, coaxial line, parallel double waveguide or parallel flat waveguide.
7. a kind of New-type radio-frequency signal Direct Sampling system based on spatial sampling according to claim 5, is characterized in that: described signal coupling module is independent capacitance, microstrip line construction electric capacity, coupler or probe.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107896412A (en) * | 2017-09-27 | 2018-04-10 | 中国科学院合肥物质科学研究院 | A kind of high frequency magnetic probe diagnostic system for being used to measure radio frequency wave property |
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