CN109581053A - A kind of method and device based on vector analysis calibration frequency modulation deviation amount - Google Patents
A kind of method and device based on vector analysis calibration frequency modulation deviation amount Download PDFInfo
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- CN109581053A CN109581053A CN201811512107.9A CN201811512107A CN109581053A CN 109581053 A CN109581053 A CN 109581053A CN 201811512107 A CN201811512107 A CN 201811512107A CN 109581053 A CN109581053 A CN 109581053A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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Abstract
The embodiment of the invention provides a kind of methods based on vector analysis calibration frequency modulation deviation amount, which is characterized in that comprising steps of carrying out signal condition to FM signal, obtains the stable FM signal of output amplitude；Vector signal is converted by the stable FM signal of the output amplitude, the vector signal includes the simulation road I signal and the simulation road Q signal；Simulation I road signal and the simulation road Q signal to the vector signal carry out mixing and baseband low pass wave respectively, filter out intermodulation signal, spurious signal and original FM signal caused by mixing；The simulation I road signal and the simulation road Q signal that frequency modulation and baseband low pass wave are obtained carry out analog-to-digital conversion, obtain the digital road I signal and the number road Q signal；The digital road I signal and the number road Q signal are subjected to signal synthesis, obtain amplitude and phase information according to direction vector feature；Composite signal is transformed into modulation domain, obtains the situation of change of the frequency modulation deviation signal according to time change in modulation domain.
Description
Technical field
The present invention relates to radio electronics engineering measurement fields, more particularly to one kind to calibrate frequency modulation deviation based on vector analysis
The method of amount.
Background technique
In the radio electronics engineering measurement field such as communication, broadcast, TV, radar, aviation and remote-control romote-sensing, frequency modulation is
A kind of mode of most basic transmission information, it has and is distorted small for the mode of frequency modulation, the features such as strong antijamming capability, is answered extensively
Used in frequency modulation broadcasting, the transmission of FM multiplex, the sound of television equipment and image, carried by multichannel communication multiple telecommunication, frequency modulation power line
The engineering equipments such as wave communication and remote-measuring equipment, military commerical radar all use frequency modulation technology.Entrained by by the way of frequency modulation
Information content number be modulation parameter important characteristic manner, that is to say, that the size of frequency modulation deviation amount is directly related to biography
It is how much defeated, and measure the important technology index that FM signal generates the modulating characteristic of equipment, be production firm, purchaser,
User's even user's concern.
Usually characterization frequency modulation parametric characteristics is amounts of frequency offset, it is related with modulating frequency.Traditional measurement frequency modulation deviation
Method mainly have counter mean value method, oscillograph zero beat method, the direct method of measurement, spectrum measurement method, Cup and zeros of a function method,
Frequency discriminator method etc., related Principle and method of measurement is different, moreover, the measurement range that each method is applicable, causes to make
With equipment difference, the class of accuracy of measurement result is also different, therefore, how could accurately measure the amount of frequency modulation deviation
Value, more can be suitably used for different measuring ranges on the basis of guaranteeing high accuracy, is the thing that should not coordinate.
Summary of the invention
The purpose of the present invention is to provide a kind of methods based on vector analysis calibration frequency modulation deviation amount, which is characterized in that
Comprising steps of
Step 101: signal condition being carried out to FM signal, obtains the stable FM signal of output amplitude.At signal amplitude
In reasonable working condition, guarantee that signal keeps good matching properties in wideband segment limit.
Step 102: converting vector signal for the stable FM signal of the output amplitude, the vector signal includes mould
The quasi- road I signal and the simulation road Q signal.
Step 103: simulation I road signal and the simulation road Q signal to the vector signal carry out mixing and base band respectively
Low-pass filtering filters out intermodulation signal, spurious signal and original FM signal caused by mixing.
Step 104: the simulation I road signal and the simulation road Q signal that frequency modulation and baseband low pass wave are obtained carry out modulus
Conversion, obtains the digital road I signal and the number road Q signal.
Step 105: the digital road I signal and the number road Q signal being subjected to signal synthesis, obtained according to direction vector feature
Amplitude and phase information.
Step 106: composite signal being transformed into modulation domain, obtains the frequency modulation deviation signal according to time change in modulation domain
Situation of change.
Preferably, the FM signal that the output amplitude is stable of the step 102 is converted into vector signal, the arrow
Amount signal includes the simulation road I signal and the simulation road Q signal method particularly includes: the stable FM signal of the output amplitude is divided into
Two-way, the orthogonal two paths of signals generated respectively with digital intermediate frequency are mixed, and the stable FM signal of output amplitude is mixed
To base band, vector signal is obtained.
Preferably, the situation of change of the frequency modulation deviation signal of the step 106 include obtain frequency modulation deviation positive bias and
Negative offset and acquisition modulating frequency.
Preferably, the positive bias of the acquisition frequency modulation deviation of the step 106 and negative offset method particularly includes: in modulation domain
In display figure in, positive peak and negative peak in figure are shown by measurement modulation domain, obtain the positive bias of frequency modulation deviation and negative
Deviator.
Preferably, the acquisition modulating frequency of the step 106 method particularly includes: shown in figure by measurement modulation domain
Deviation between adjacent peak obtains modulating frequency.
The embodiment of the invention also provides a kind of devices based on vector analysis calibration frequency modulation deviation amount, which is characterized in that
Include:
Conditioning module obtains the stable FM signal of output amplitude for carrying out signal condition to FM signal.
Vector signal obtains module, described for converting vector signal for the stable FM signal of the output amplitude
Vector signal includes the simulation road I signal and the simulation road Q signal.
Filter module, for the vector signal simulation I road signal and simulation the road Q signal respectively carry out mixing and
Baseband low pass wave filters out intermodulation signal, spurious signal and original FM signal caused by mixing.
Analog-to-digital conversion module, simulation I road signal and the simulation road Q signal for obtaining frequency modulation and baseband low pass wave
Analog-to-digital conversion is carried out, the digital road I signal and the number road Q signal are obtained.
Synthesis module, for the digital road I signal and the number road Q signal to be carried out signal synthesis, according to direction vector spy
Sign obtains amplitude and phase information.
Frequency modulation deviation signaling module is obtained to obtain in modulation domain according to the time for composite signal to be transformed into modulation domain
The situation of change of the frequency modulation deviation signal of variation.
Preferably, it further includes mixing unit that the vector signal, which obtains module, and the mixing unit is used for the output
The FM signal of amplitude stabilization is divided into two-way, and the orthogonal two paths of signals generated respectively with digital intermediate frequency is mixed, and will export
The FM signal of amplitude stabilization is mixed to base band, obtains vector signal.
Preferably, the acquisition frequency modulation deviation signaling module further includes obtaining deviator unit and acquisition modulating frequency unit.
Preferably, the positive bias and negative offset for obtaining deviator unit and being used to obtain frequency modulation deviation, method particularly includes:
In display figure in modulation domain, positive peak and negative peak in figure are shown by measurement modulation domain, obtain the positively biased of frequency modulation deviation
Amount and negative offset.
Preferably, the acquisition modulating frequency unit is used to show in figure between adjacent peak by measurement modulation domain
Deviation obtains modulating frequency.
The advantages of present invention provides a kind of completely new calibrating method for the measurement of FM signal amounts of frequency offset, the invention is can
To carry out the measurement of amounts of frequency offset for the FM signal in different frequency wave band, accuracy is calibrated better than ± 1%, meanwhile, also
It is capable of measuring the modulating characteristics such as modulating frequency and frequency-modulation distortion.
Detailed description of the invention
Fig. 1 is a kind of flow chart of method that frequency modulation deviation amount is calibrated based on vector analysis of the embodiment of the present invention.
Fig. 2 is a kind of module map of device that frequency modulation deviation amount is calibrated based on vector analysis of the embodiment of the present invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Proposed by the present invention is a kind of method based on vector analysis calibration frequency modulation deviation.This method sets FM signal
For a vector signal, the characteristics of carrying amplitude and phase using vector signal, FM signal is carried out at orthogonal two paths of signals
After reason, synthesize the variable quantity of the amplitude and phase of signal, in the deviation of the modulation domain measurement frequency of vector, available frequency modulation
Modulating frequency, the frequency modulation deviation (including positive bias and negative offset) of signal.
As shown in Figure 1, the embodiment of the invention provides a kind of method based on vector analysis calibration frequency modulation deviation amount, it is special
Sign is, comprising steps of
Step 101: signal condition being carried out to FM signal, obtains the stable FM signal of output amplitude.
Step 102: converting vector signal for the stable FM signal of the output amplitude, the vector signal includes mould
The quasi- road I signal and the simulation road Q signal.
According to one embodiment of present invention, the FM signal conversion that the output amplitude is stable of the step 102
For vector signal, the vector signal includes the simulation road I signal and the simulation road Q signal method particularly includes: the output amplitude
Stable FM signal is divided into two-way, and the orthogonal two paths of signals generated respectively with digital intermediate frequency is mixed, by output amplitude
Stable FM signal is mixed to base band, obtains vector signal.
Step 103: simulation I road signal and the simulation road Q signal to the vector signal carry out mixing and base band respectively
Low-pass filtering filters out intermodulation signal, spurious signal and original FM signal caused by mixing.
Step 104: the simulation I road signal and the simulation road Q signal that frequency modulation and baseband low pass wave are obtained carry out modulus
Conversion, obtains the digital road I signal and the number road Q signal.
Step 105: the digital road I signal and the number road Q signal being subjected to signal synthesis, obtained according to direction vector feature
Amplitude and phase information.
Step 106: composite signal being transformed into modulation domain, obtains the frequency modulation deviation signal according to time change in modulation domain
Situation of change.
According to one embodiment of present invention, the situation of change of the frequency modulation deviation signal of the step 106 includes obtaining to adjust
Again and again inclined positive bias and negative offset and acquisition modulating frequency.
Wherein, the positive bias of the acquisition frequency modulation deviation of the step 106 and negative offset method particularly includes: in modulation domain
Display figure in, by measurement modulation domain show figure in positive peak and negative peak, obtain the positive bias and negative bias of frequency modulation deviation
Amount.
Wherein, the acquisition modulating frequency of the step 106 method particularly includes: pass through measurement modulation domain and show phase in figure
Deviation between adjacent peak value obtains modulating frequency.
Another embodiment of the invention additionally provides a kind of device based on vector analysis calibration frequency modulation deviation amount, such as schemes
Shown in 2, comprising:
Conditioning module obtains the stable FM signal of output amplitude for carrying out signal condition to FM signal.
Vector signal obtains module, described for converting vector signal for the stable FM signal of the output amplitude
Vector signal includes the simulation road I signal and the simulation road Q signal.
According to one embodiment of present invention, it further includes mixing unit that the vector signal, which obtains module, and the mixing is single
Member is used to the stable FM signal of the output amplitude being divided into two-way, the orthogonal two paths of signals generated respectively with digital intermediate frequency
It is mixed, the stable FM signal of output amplitude is mixed to base band, obtains vector signal.
Filter module, for the vector signal simulation I road signal and simulation the road Q signal respectively carry out mixing and
Baseband low pass wave filters out intermodulation signal, spurious signal and original FM signal caused by mixing.
Analog-to-digital conversion module, simulation I road signal and the simulation road Q signal for obtaining frequency modulation and baseband low pass wave
Analog-to-digital conversion is carried out, the digital road I signal and the number road Q signal are obtained.
Synthesis module, for the digital road I signal and the number road Q signal to be carried out signal synthesis, according to direction vector spy
Sign obtains amplitude and phase information.
Frequency modulation deviation signaling module is obtained to obtain in modulation domain according to the time for composite signal to be transformed into modulation domain
The situation of change of the frequency modulation deviation signal of variation.
According to one embodiment of present invention, the acquisition frequency modulation deviation signaling module further includes obtaining deviator unit and obtaining
Take modulating frequency unit.
Wherein, the positive bias and negative offset for obtaining deviator unit and being used to obtain frequency modulation deviation, method particularly includes: it is adjusting
In display figure in domain processed, positive peak and negative peak in figure are shown by measurement modulation domain, obtain the positive bias of frequency modulation deviation
And negative offset.
Wherein, the modulating frequency unit that obtains is used for by inclined between adjacent peak in measurement modulation domain display figure
Difference obtains modulating frequency.
The advantages of present invention provides a kind of completely new calibrating method for the measurement of FM signal amounts of frequency offset, the invention is can
To carry out the measurement of amounts of frequency offset for the FM signal in different frequency wave band, accuracy is calibrated better than ± 1%, meanwhile, also
It is capable of measuring the modulating characteristics such as modulating frequency and frequency-modulation distortion.
Obviously, those skilled in the art can carry out various modification and variations without departing from spirit of the invention to invention
And range.If in this way, these modifications and changes of the present invention belong to the claims in the present invention and its equivalent technologies range it
Interior, then the invention is also intended to include including these modification and variations.
Claims (10)
1. a kind of method based on vector analysis calibration frequency modulation deviation amount, which is characterized in that comprising steps of
Step 101: signal condition being carried out to FM signal, obtains the stable FM signal of output amplitude；
Step 102: converting vector signal for the stable FM signal of the output amplitude, the vector signal includes simulation I
Road signal and the simulation road Q signal；
Step 103: simulation I road signal and the simulation road Q signal to the vector signal carry out mixing and base band low pass respectively
Filtering filters out intermodulation signal, spurious signal and original FM signal caused by mixing；
Step 104: the simulation I road signal and the simulation road Q signal that frequency modulation and baseband low pass wave are obtained carry out analog-to-digital conversion,
Obtain the digital road I signal and the number road Q signal；
Step 105: the digital road I signal and the number road Q signal being subjected to signal synthesis, obtain amplitude according to direction vector feature
And phase information；
Step 106: composite signal being transformed into modulation domain, obtains the change of the frequency modulation deviation signal according to time change in modulation domain
Change situation.
2. the method as described in claim 1, which is characterized in that the frequency modulation that the output amplitude is stable of the step 102
Signal is converted into vector signal, and the vector signal includes the simulation road I signal and the simulation road Q signal method particularly includes: described
The stable FM signal of output amplitude is divided into two-way, and the orthogonal two paths of signals generated respectively with digital intermediate frequency is mixed, will
The stable FM signal of output amplitude is mixed to base band, obtains vector signal.
3. the method as described in claim 1, which is characterized in that the situation of change packet of the frequency modulation deviation signal of the step 106
It includes the positive bias for obtaining frequency modulation deviation and negative offset and obtains modulating frequency.
4. method as claimed in claim 3, which is characterized in that the positive bias of the acquisition frequency modulation deviation of the step 106 and negative
Deviator method particularly includes: in the display figure in modulation domain, positive peak and negative peak in figure are shown by measurement modulation domain,
Obtain the positive bias and negative offset of frequency modulation deviation.
5. method as claimed in claim 3, which is characterized in that the acquisition modulating frequency of the step 106 method particularly includes:
Show that the deviation in figure between adjacent peak obtains modulating frequency by measurement modulation domain.
6. a kind of device based on vector analysis calibration frequency modulation deviation amount characterized by comprising
Conditioning module obtains the stable FM signal of output amplitude for carrying out signal condition to FM signal；
Vector signal obtains module, for converting vector signal, the vector for the stable FM signal of the output amplitude
Signal includes the simulation road I signal and the simulation road Q signal；
Filter module carries out mixing and base band with the simulation road Q signal for the simulation I road signal to the vector signal respectively
Low-pass filtering filters out intermodulation signal, spurious signal and original FM signal caused by mixing；
Analog-to-digital conversion module, simulation I road signal and the simulation road Q signal for obtaining frequency modulation and baseband low pass wave carry out
Analog-to-digital conversion obtains the digital road I signal and the number road Q signal；
Synthesis module is obtained for the digital road I signal and the number road Q signal to be carried out signal synthesis according to direction vector feature
Take amplitude and phase information；
Frequency modulation deviation signaling module is obtained to obtain in modulation domain according to time change for composite signal to be transformed into modulation domain
Frequency modulation deviation signal situation of change.
7. device as claimed in claim 6, which is characterized in that it further includes mixing unit that the vector signal, which obtains module, institute
Mixing unit is stated for the stable FM signal of the output amplitude to be divided into two-way, is generated respectively with digital intermediate frequency orthogonal
Two paths of signals is mixed, and the stable FM signal of output amplitude is mixed to base band, obtains vector signal.
8. device as claimed in claim 6, which is characterized in that the acquisition frequency modulation deviation signaling module further includes obtaining deviator
Unit and acquisition modulating frequency unit.
9. device as claimed in claim 8, which is characterized in that the positively biased for obtaining deviator unit and being used to obtain frequency modulation deviation
Amount and negative offset, method particularly includes: in the display figure in modulation domain, positive peak in figure is shown by measurement modulation domain and is born
Peak value obtains the positive bias and negative offset of frequency modulation deviation.
10. device as claimed in claim 8, which is characterized in that the acquisition modulating frequency unit is used for through measurement modulation
Domain shows that the deviation in figure between adjacent peak obtains modulating frequency.
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