CN105282074A - Digital amplitude modulation method applied to RF microwave signal source - Google Patents

Digital amplitude modulation method applied to RF microwave signal source Download PDF

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Publication number
CN105282074A
CN105282074A CN201510736545.3A CN201510736545A CN105282074A CN 105282074 A CN105282074 A CN 105282074A CN 201510736545 A CN201510736545 A CN 201510736545A CN 105282074 A CN105282074 A CN 105282074A
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Prior art keywords
modulation
performance number
signal source
frequency
amplitude modulation
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李胜寅
王闻浩
王丽明
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Shanghai TransCom Instruments Co Ltd
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Shanghai TransCom Instruments Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/08—Amplitude regulation arrangements

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention relates to a digital amplitude modulation method applied to an RF microwave signal source. The digital amplitude modulation method comprises the steps of: establishing a lookup table about frequency and power correspondence according to calibration data of the RF microwave signal source; converting a signal to be modulated into power values at various moments under a set modulation rate condition; looking up the corresponding power values and outputting values of corresponding points in the lookup table; and processing the obtained values of all the points to output a complete envelope curve. By adopting the digital amplitude modulation method applied to the RF microwave signal source, the finally generated envelope is not affected by frequency response of key devices in the link as a traditional modulation method, the output envelop of the modulation signal can serve as a final output signal directly through software verification, the modulation signal does not need to be recalibrated again, a lot of debugging time is saved on the premise of ensuring accuracy, and the digital amplitude modulation method has broader application range.

Description

Be applied to the digitlization amplitude modulation approach of frequency microwave signal source
Technical field
The present invention relates to amplitude modulation technique field, particularly relate to the high-precision amplitude modulation technique field of the large degree of depth, specifically refer to a kind of digitlization amplitude modulation approach being applied to frequency microwave signal source.
Background technology
Information signal is transmitted between the transmitter and receiver by certain transmission medium, but the primitive form of signal is generally not suitable for transmission, therefore, must change their form, and low frequency information signal loading is called modulation to the process of high-frequency carrier signal.
The development of digital circuit brings more new approaches to analog-modulated function.
Analog-modulated has a very important role in signal source system, by modulation, frequency spectrum shift can be carried out, the frequency spectrum shift of modulation signal on desired position, thus modulation signal is converted to be suitable for transmission or be convenient to the multiplexing modulated signal of Channel, this contributes to the validity and reliability improving system transfers.The amplitude modulation signal instantaneous value of high frequency carrier and the process changed is called amplitude modulation (AM).
Amplitude modulation(PAM) mode the most frequently used in signal source is as carrier wave and by the process of low frequency information signal loading to high-frequency carrier signal with sinusoidal wave.And auto level control (AutoLevelControl, referred to as ALC) circuit is amplitude modulation(PAM) (AM) function realizing signal source, ensure the core cell of the power output precision of signal generator simultaneously.Auto level control is generally by realizing amplitude modulation(PAM) and Automatic level control to the control of variable attenuator in link (VVA) and radio frequency amplifier and selection.
Generally, the frequency response of the RF power device such as the variable attenuator in link, amplifier is nonlinear, at this moment the index of the modulation depth of modulation signal and modulation distortion may change along with the change of carrier frequency and modulation rate, the accuracy that the index of amplitude modulation(PAM) can become along with the rising of carrier frequency worse and worse, by the impact of amplifier frequency response in link, the rising link gain along with frequency diminishes and causes the peak power output of ALC to reduce gradually.Therefore higher in the accuracy of low-frequency range amplitude modulation(PAM) for a long time, but along with the rising of frequency, the degree of depth of amplitude modulation and accuracy are difficult to accomplish very high.Above factor is had higher requirement to auto level control link, increases difficulty and the cost of research and development.And for batch instrument, the performance of modules is because the non-linear meeting of frequency response brings extra work amount to the calibration of instrument index.
Summary of the invention
The object of the invention is the shortcoming overcoming above-mentioned prior art, provide and a kind ofly can realize utilizing calibration data, adopt a kind of digitized amplitude modulation(PAM) to export mechanism, realize the modulation depth of super large and realize accurately controlling, having the digitlization amplitude modulation approach being applied to frequency microwave signal source of broader applications scope.
To achieve these goals, the digitlization amplitude modulation approach being applied to frequency microwave signal source of the present invention has following formation:
This is applied to the digitlization amplitude modulation approach of frequency microwave signal source, and its main feature is, described method comprises the following steps:
(1) set up about frequency and look-up table corresponding to power according to the calibration data of frequency microwave signal source;
(2) signal to be modulated is converted into the performance number in each moment under setting modulation rate condition;
(3) in described frequency and look-up table corresponding to power, find corresponding performance number and export the value of corresponding points;
(4) obtained value is a little carried out process and export complete envelope curve.
Preferably, described step (1), is specially:
Radio frequency microwave signal obtains each Frequency point performance number from small to large corresponding in ALC loop dynamics and obtains look-up table according to each Frequency point and corresponding performance number after calibrating.
Preferably, described step (2), is specially:
Described modulation signal and carrier signal are synthesized and is converted into the performance number setting each moment under modulation rate condition.
More preferably, described step (3), is specially:
When modulation waveform is sinusoidal wave, obtain the performance number envelope of the modulation signal under different modulating rate and modulation depth according to following formula,
P g a i n max = 10 l o g 1 1 - d e p t h - - - ( 1 - 1 )
P outmax＝P c+P gainmax(1-2)
P outmin＝P c-P gainmax
P m＝P outmax·sin(2π·f m·t)(1-3)
P out＝P c+P m＝P c+P outmax·sin(2π·f m·t)(1-4)
Wherein, P gainmaxfor the maximum that the power of modulation signal changes with modulation depth,
Depth is modulation depth,
P outmaxfor the peak power output of modulation signal,
P cfor the power output of carrier wave,
P mfor the power output of modulation signal,
P outfor the power output of modulation signal,
F mfor the modulation rate of modulation signal.
The envelope power that formula (1-4) gives the most frequently used sine wave modulation exports formula, and other modulation waveforms such as triangular wave, sawtooth waveforms, square wave etc. in like manner can obtain.
Preferably, between described step (3) and (4), further comprising the steps of:
(3-1) performance number do not found in described look-up table is calculated to the value of corresponding points.
More preferably, described step (3-1), comprises the following steps:
(3-1-1) performance number do not found in described look-up table and the theoretical performance number got are contrasted, if within the range of tolerable variance of setting, then continue step (3-1-3), otherwise continue step (3-1-2);
(3-1-2) give up point corresponding to this performance number and adopt least square method again to get a little near this point, then continuing step (3-1-3);
(3-1-3) value of the point corresponding to the performance number nearest apart from this performance number carries out the value that matching obtains this point.
Preferably, described obtained value a little carried out process export complete envelope curve, comprise the following steps:
The value of all corresponding points obtained tabling look-up exports digital to analog converter to and obtains complete envelope curve.
Have employed the digitlization amplitude modulation approach being applied to frequency microwave signal source in this invention, there is following beneficial effect:
In the present invention, workload the best part is the foundation of power search database, and this database is a part for instrument calibration data in the present invention, directly calls, and does not increase additional workload; The range value that the present invention finally exports is through formula direct derivation and produces, the value generated to be accurate in modulation range almost each concrete power points, these points are all points accurately after calibration, the envelope finally generated is subject to the impact of Primary Component frequency response in link unlike traditional modulation, and the envelope of the modulation signal of output can directly as last output signal by software verification; This modulation signal requires no to be calibrated again, under the prerequisite that ensure that accuracy, has saved in a large number debug time, has had range of application widely.
Accompanying drawing explanation
Fig. 1 is the flow chart being applied to the digitlization amplitude modulation approach of frequency microwave signal source of the present invention.
Fig. 2 is the flow chart of the signal automatic calibration of frequency microwave signal source.
Embodiment
In order to more clearly describe technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
In order to overcome the above problems, the invention provides a kind of digitlization amplitude modulation approach being applied to frequency microwave signal source, the signal of frequency microwave signal source is obtained after calibration data through automatic calibration, utilizes calibration data to set up one about frequency and look-up table corresponding to power.When carrying out amplitude modulation(PAM), modulation signal is carried out preliminary treatment, by the conversion formula of deriving specially, itself and carrier signal are synthesized, being converted into the performance number of each particular moment under setting modulation rate condition, by searching the data look-up table set up, finding corresponding performance number, the value of this point of direct output, value a little all by software calculate search, then Mass production, finally obtains and exports complete envelope curve.This invention can realize the accurate control of amplitude modulation function, and when not needing to carry out calibration separately to AM, modulation depth and modulation rate can be guaranteed.
Larger Dynamic auto level control module comprises: variable attenuator, amplifier and wave detector; For realizing the requirement of great dynamic range, variable attenuator is the cascade of multistage variable attenuator, and the signal exported by DAC controls its attenuation simultaneously.Amplifier is fixed gain amplifier, can be used for the insertion loss of radio-frequency (RF) switch and variable attenuator in compensate for link, meets the requirement of link peak power output.
Automatic calibration and data look-up table are set up and are comprised: automatic calibration is the necessary process that signal source precision exports, the present invention takes full advantage of the outcome data of signal source calibration, calibration data is set up a frequency and database corresponding to power, calibration data base is basis of the present invention, but the foundation of this database does not have at substantial energy.Based on this database, the present invention completes function and the index of amplitude debugging by a kind of mechanism completely newly.The present invention passes through modulation rate and the modulation depth of setting, the performance number of its correspondence is converted to through the calculating of software, software is constantly automatically found calibration data corresponding in database, finally modulation signal is sent, above computing and control have been coordinated by host computer and FPGA, and arithmetic speed and speed control meet the requirement within the scope of modulation rate completely.The envelope of the modulation signal formed is owing to have employed the data genaration after calibration, definitely accurate on Enveloping theory.Even if count the inevitable error of hardware calibration in, do not need calibrating again through conventional amplitude modulation(PAM) mode, can directly export high-precision am signals yet; Under the support of Larger Dynamic alc circuit, modulation depth also can reach high standard, and ALC module 40dB supports down dynamically after calibration, can realize the modulation depth of 99% in theory.
The digitlization amplitude modulation approach being applied to frequency microwave signal source of the present invention comprises the following steps:
(1) set up about frequency and look-up table corresponding to power according to the calibration data of frequency microwave signal source;
(2) signal to be modulated is converted into the performance number in each moment under setting modulation rate condition;
(3) in described frequency and look-up table corresponding to power, find corresponding performance number and export the value of corresponding points;
(4) obtained value is a little carried out process and export complete envelope curve.
Preferably, described step (1), is specially:
Radio frequency microwave signal obtains each Frequency point performance number from small to large corresponding in ALC loop dynamics and obtains look-up table according to each Frequency point and corresponding performance number after calibrating.
Preferably, described step (2), is specially:
Described modulation signal and carrier signal are synthesized and is converted into the performance number setting each moment under modulation rate condition.
More preferably, described step (3), is specially:
When modulation waveform is sinusoidal wave, obtain the performance number envelope of the modulation signal under different modulating rate and modulation depth according to following formula,
P g a i n max = 10 l o g 1 1 - d e p t h - - - ( 1 - 1 )
P outmax＝P c+P gainmax(1-2)
P outmin＝P c-P gainmax
P m＝P outmax·sin(2π·f m·t)(1-3)
P out＝P c+P m＝P c+P outmax·sin(2π·f m·t)(1-4)
Wherein, P gainmaxfor the maximum that the power of modulation signal changes with modulation depth,
Depth is modulation depth,
P outmaxfor the peak power output of modulation signal,
P cfor the power output of carrier wave,
P mfor the power output of modulation signal,
P outfor the power output of modulation signal,
F mfor the modulation rate of modulation signal.
The envelope power that formula (1-4) gives the most frequently used sine wave modulation exports formula, and other modulation waveforms such as triangular wave, sawtooth waveforms, square wave etc. in like manner can obtain.
Preferably, between described step (3) and (4), further comprising the steps of:
(3-1) performance number do not found in described look-up table is calculated to the value of corresponding points.
More preferably, described step (3-1), comprises the following steps:
(3-1-1) performance number do not found in described look-up table and the theoretical performance number got are contrasted, if within the range of tolerable variance of setting, then continue step (3-1-3), otherwise continue step (3-1-2); The performance number that theory is got can be carry out according to other performance numbers obtained around this some the theoretical value that the Fitting Calculation obtains, or by theoretical value that theory calculate obtains.
(3-1-2) give up point corresponding to this performance number and adopt least square method again to get a little near this point, then continuing step (3-1-3);
(3-1-3) value of the point corresponding to the performance number nearest apart from this performance number carries out the value that matching obtains this point.
Preferably, described obtained value a little carried out process export complete envelope curve, comprise the following steps:
The value of all corresponding points obtained tabling look-up exports digital to analog converter to and obtains complete envelope curve.
Fig. 2 illustrates automatic calibration flow instance in the present invention, by the signal source calibration steps by patent protection, records all calibration data, utilizes calibration data, and signal source can accomplish that the high accuracy of power exports.The present invention utilizes this existing database, and the mode using a kind of digitlization to table look-up is to realize analog-modulated function.Alignment method of the present invention adopts patent publication No. to be CN104635035A, and patent name is the collimation technique of " realizing the quickly calibrated system and method for signal source power based on fraction block structure ".
Through this calibration steps, Automatic level control data required in this patent can generate automatically through " auto level control (ALC) data of the first power meter gained ", each Frequency point has performance number from small to large corresponding in ALC loop dynamics, such as, performance number resolution is 0.5dBm, has the performance number P through calibration when frequency is 1GHz calibration: the data of 0dBm, 0.5dBm, 1dBm, 1.5dBm, 2dBm etc.These are arranged distribution in order, constitutes frequency and database corresponding to power.
Fig. 1 illustrates the main flow based on the amplitude modulation(PAM) of digitlization lookup table mode in the present invention.After the modulation rate being provided with amplitude modulation(PAM) at signal source interface and modulation depth, through the calculating of upper computer software, can calculate the function curve of power along with time variations of this Frequency point corresponding under the state of these settings, the point in function curve is corresponded to the performance number through calibration in calibration data look-up table by upper computer software process.
For sine wave,
P g a i n max = 10 l o g 1 1 - d e p t h - - - ( 1 - 1 )
P outmax＝P c+P gainmax
P outmin＝P c-P gainmax(1-2)
P m＝P outmax·sin(2π·f m·t)(1-3)
P out＝P c+P m＝P c+P outmax·sin(2π·f m·t)(1-4)
Wherein, P gainmaxfor the maximum that the power of modulation signal changes with modulation depth,
Depth is modulation depth,
P outmaxfor the peak power output of modulation signal,
P cfor the power output of carrier wave,
P mfor the power output of modulation signal,
P outfor the power output of modulation signal,
F mfor the modulation rate of modulation signal.
By formula (1-4), the performance number envelope of the modulation signal under different modulating rate and modulation depth can be drawn.The envelope power that formula (1-4) gives the most frequently used sine wave modulation exports formula, and other modulation waveforms such as triangular wave, sawtooth waveforms, square wave etc. in like manner can obtain.
The calibration point of all correspondences makes batch alignment processing by upper computer software, and these points define the envelope of amplitude modulation(PAM).
Above got calibration point may not be the function curve definitely corresponding to modulation signal, because can not accomplish that the power of each minimum resolution is calibrated during calibration, some calibration point will inevitably can depart from the corresponding curve of modulation signal, finally have employed comparison method in the present invention the actual point got and right point are in theory contrasted, if beyond the range of tolerable variance of regulation, this point will be given up, again get a little near this point, the mode of least square method is adopted to make tolerance within the scope allowed, this calibration data corresponding to point chosen automatically by software.If after repeatedly circulation, still do not find the calibration point met the demands, software will give up this point automatically, directly this is carried out matching by nearest two small one and large one two calibration points.
After having corresponded to the point of batch, all points have been sent to the digital to analog converter (DAC) of Larger Dynamic ALC module again by FPGA, and DAC exports the VVA in corresponding controlling value adjustment loop, and these modulation envelopes generated by calibration data just generate.
Have employed the digitlization amplitude modulation approach being applied to frequency microwave signal source in this invention, there is following beneficial effect:
In the present invention, workload the best part is the foundation of power search database, and this database is a part for instrument calibration data in the present invention, directly calls, and does not increase additional workload; The range value that the present invention finally exports is through formula direct derivation and produces, the value generated to be accurate in modulation range almost each concrete power points, these points are all points accurately after calibration, the envelope finally generated is subject to the impact of Primary Component frequency response in link unlike traditional modulation, and the envelope of the modulation signal of output can directly as last output signal by software verification; This modulation signal requires no to be calibrated again, under the prerequisite that ensure that accuracy, has saved in a large number debug time, has had range of application widely.
In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.

Claims (7)

1. be applied to a digitlization amplitude modulation approach for frequency microwave signal source, it is characterized in that, described method comprises the following steps:
(1) set up about frequency and look-up table corresponding to power according to the calibration data of frequency microwave signal source;
(2) signal to be modulated is converted into the performance number in each moment under setting modulation rate condition;
(3) in described frequency and look-up table corresponding to power, find corresponding performance number and export the value of corresponding points;
(4) obtained value is a little carried out process and export complete envelope curve.
2. the digitlization amplitude modulation approach being applied to frequency microwave signal source according to claim 1, is characterized in that, described step (1), is specially:
Radio frequency microwave signal obtains each Frequency point performance number from small to large corresponding in ALC loop dynamics and obtains look-up table according to each Frequency point and corresponding performance number after calibrating.
3. the digitlization amplitude modulation approach being applied to frequency microwave signal source according to claim 1, is characterized in that, described step (2), is specially:
Described modulation signal and carrier signal are synthesized and is converted into the performance number setting each moment under modulation rate condition.
4. the digitlization amplitude modulation approach being applied to frequency microwave signal source according to claim 3, is characterized in that, described step (3), is specially:
When modulation waveform is sinusoidal wave, obtain the performance number envelope of the modulation signal under different modulating rate and modulation depth according to following formula,
P g a i n m a x = 10 l o g 1 1 - d e p t h
P outmax＝P c+P gainmax
P outmin＝P c-P gainmax
P m＝P outmax·sin(2π·f m·t)
P out＝P c+P m＝P c+P outmax·sin(2π·f m·t)
Wherein, P gainmaxfor the maximum that the power of modulation signal changes with modulation depth,
Depth is modulation depth,
P outmaxfor the peak power output of modulation signal,
P cfor the power output of carrier wave,
P mfor the power output of modulation signal,
P outfor the power output of modulation signal,
F mfor the modulation rate of modulation signal.
5. the digitlization amplitude modulation approach being applied to frequency microwave signal source according to claim 1, is characterized in that, between described step (3) and (4), further comprising the steps of:
(3-1) performance number do not found in described look-up table is calculated to the value of corresponding points.
6. the digitlization amplitude modulation approach being applied to frequency microwave signal source according to claim 5, is characterized in that, described step (3-1), comprises the following steps:
(3-1-1) performance number do not found in described look-up table and the theoretical performance number got are contrasted, if within the range of tolerable variance of setting, then continue step (3-1-3), otherwise continue step (3-1-2);
(3-1-2) give up point corresponding to this performance number and adopt least square method again to get a little near this point, then continuing step (3-1-3);
(3-1-3) value of the point corresponding to the performance number nearest apart from this performance number carries out the value that matching obtains this point.
7. the digitlization amplitude modulation approach being applied to frequency microwave signal source according to claim 1, is characterized in that, described obtained value is a little carried out process export complete envelope curve, comprises the following steps:
The value of all corresponding points obtained tabling look-up exports digital to analog converter to and obtains complete envelope curve.
CN201510736545.3A 2015-11-03 2015-11-03 Digital amplitude modulation method applied to RF microwave signal source Pending CN105282074A (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN113867238A (en) * 2021-12-06 2021-12-31 成都威频科技有限公司 Agile ALC system with amplitude and pulse modulation functions and control method thereof

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WO2006065388A1 (en) * 2004-12-16 2006-06-22 The Boeing Company Broadband high efficiency traveling wave tube amplifier system
US20070230615A1 (en) * 2006-03-31 2007-10-04 Taylor Stewart S Reduced distortion amplifier
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Publication number Priority date Publication date Assignee Title
CN113867238A (en) * 2021-12-06 2021-12-31 成都威频科技有限公司 Agile ALC system with amplitude and pulse modulation functions and control method thereof
CN113867238B (en) * 2021-12-06 2022-02-11 成都威频科技有限公司 Agile ALC system with amplitude and pulse modulation functions and control method thereof

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