CN109541307A - The circuit structure of UWB signal analysis function is realized based on Single Conversion technology - Google Patents
The circuit structure of UWB signal analysis function is realized based on Single Conversion technology Download PDFInfo
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Abstract
The present invention relates to a kind of circuit structures that UWB signal analysis function is realized based on Single Conversion technology, including prefilter module is for inhibiting out of band signal；First passage circuit module is for handling the input signal through wave filter；Second channel circuit module is for handling the input signal through wave filter；Scan local oscillation signal and digital oscillator frequency and detection output of the synchronizing generator for synchronization process first passage circuit module and second channel circuit module；Comparison circuit module is exported for comparing two-way DET signal, and by the low signal of amplitude.The circuit structure for realizing UWB signal analysis function based on Single Conversion technology using this, realizes the measurement and analysis of broadband signal, and circuit structure is simple, has the advantages that Single Conversion, the lower power consumption of circuit, reliability improves, and cost is greatly reduced；Wide range frequency covering can be achieved, while efficiently solving the problems, such as the image interference that single-stage frequency conversion generates.With stronger practicability.
Description
Technical field
The present invention relates to signal analysis field more particularly to broadband signal analysis instrument fields, in particular to one kind based on single
Secondary converter technique realizes the circuit structure of UWB signal analysis function.
Background technique
Signal analyzer is widely applied radio frequency measuring device, and outstanding advantages are that measurement frequency range is wide, high sensitivity, line
The advantages that property degree is good, is widely used in the fields such as communication, communication, navigation, radar.Typical broader frequency spectrum analyzer measurement frequency
Range can cover microwave frequency band, such as 30Hz~6GHz from low frequency and continuous.In order to reach excellent measurement accuracy and dynamic model
Enclose, this equipment mostly uses super-heterodyne technique framework, by measured signal by converter technique move to one it is fixed in
It is handled in frequent rate, due to depositing just for the image frequency in converter technique, this broadband device mostly uses 2~4 grades of frequency conversions
The covering of scheme realization full rate.The increase of frequency conversion series has increase accordingly local oscillator, filtering and amplifying circuit etc., this is resulted in
The complexity of this broadband device is high, and the cost of circuit, volume and power consumption are all higher.
Fig. 1 is a typical broadband signal analysis instrument functional block diagram.The program uses the technical solution of 3 grades of frequency conversions.
In this structure, all measured signals are all shifted in the IF frequency that fixed frequency is IF3.First order frequency conversion is general
Using high intermediate frequency scheme, i.e. IF frequency is greater than rf frequency.It therefore, is the requirement for meeting frequency measurement range, the first local oscillator
Must cover certain frequency range and with entire scanning circuit simultaneous tuning.It is followed by second, third grade of frequency conversion, due to input
Output is fixed frequency, therefore its local frequency is fixed.The tuning equation of total is as follows:
f1stLO-fRF=f1stIF
f1stIF-f2ndLO=f2ndIF
f2ndIF-f3rdLO=f3rdIF
In formula, fRFFrequency, f are inputted for radio frequency1stLOFor the first local frequency, f1stIFFor the first IF frequency, f2ndLOIt is
Two local frequencies.f2ndIFFor the second IF frequency, f3rdLOFor third local frequency, f3rdIFFor third IF frequency.
It is since frequency mixer can generate additional image interference why using so complicated multistage frequency conversion scheme.Such as
Fruit uses the single-conversion scheme of Fig. 2, simplifies hardware circuit, measured signal is directly converted to intermediate frequency.Tuning equation at this time
It is as follows:
fLO-fRF=fIF；
In formula, fRFFrequency, f are inputted for radio frequencyLOFor first frequency, fIFFor IF frequency.
According to tuning equation, when local oscillator scan frequency be tuned to fLO=fRF-fIFWhen, 1-f can be generatedIFHomogenous frequency signal,
This is the main reason for causing broadband receiver seldom to use this single-conversion.Therefore, the circuit of this single-conversion is usual
It measures and analyzes for narrow band signal, Pre Filter in front end is obtained in Fig. 2 and generally uses bandpass filter, the band of bandpass filter
Wide 2 times less than IF frequency.
In conclusion multistage frequency conversion scheme can realize that wideband frequency covers, but structure is complicated, at high cost.Though Single Conversion
Right structure is simple, but can only realize that narrow band frequency covers.
Summary of the invention
The purpose of the present invention is overcoming the above-mentioned prior art, provide that a kind of frequency coverage is wide, at low cost, knot
Structure simply realizes the circuit structure of UWB signal analysis function based on Single Conversion technology.
To achieve the goals above, the circuit of the invention that UWB signal analysis function is realized based on Single Conversion technology
Structure is as follows:
This realizes the circuit structure of UWB signal analysis function based on Single Conversion technology, is mainly characterized by, described
System include:
Prefilter module, for inhibiting out of band signal；
First passage circuit module, the input terminal of the first passage circuit module and the prefilter module
Output end is connected, for handling the input signal through wave filter；
Second channel circuit module, the input terminal of the second channel circuit module and the prefilter module
Output end is connected, for handling the input signal through wave filter；
Synchronizing generator is scanned, is connected with the first passage circuit module and second channel circuit module, is used for
The local oscillation signal of synchronization process first passage circuit module and second channel circuit module and digital oscillator frequency and detection
Output；
Comparison circuit module, the input terminal of the comparison circuit module are defeated with the first passage circuit module
Outlet is connected with the output end of second channel circuit module, for comparing two-way DET signal, and the low signal of amplitude is defeated
Out.
Preferably, the first passage circuit module includes:
First frequency mixer, the input terminal of first frequency mixer are connected with the output end of the prefilter module
It connects, for radiofrequency signal to be converted to IF frequency；
First local oscillator, the output end of first local oscillator is connected with the input terminal of first frequency mixer, described
The input terminal of the first local oscillator be connected with the output end of the scanning synchronizing generator, for providing required frequency coverage model
The frequency converter local oscillation signal enclosed；
First bandpass filter, the output end of the input terminal of first bandpass filter and first frequency mixer
It is connected, it is anti-aliasing for making to carry out；
First A-D converter, the input terminal of first A-D converter are defeated with first bandpass filter
Outlet is connected, for analog if signal to be transformed into digital signal；
First digital down converter, the input terminal of first digital down converter and first A-D converter
Output end be connected, for being converted and being extracted to signal, and provide suitable signal rate；
First digital oscillator, the output end of first digital oscillator and first digital down converter
Input terminal is connected, and the input terminal of first digital oscillator is connected with the output end of the scanning synchronizing generator
It connects, for resulting from the identical digital local oscillator signal of intermediate frequency IF frequency；
First resolution bandwidth filter, the input terminal of the first resolution bandwidth filter and first number
The output end of word low-converter is connected, for generating the FIR filter of signal analysis resolution ratio；
First detector, the output of the input terminal of the first detector and the first resolution bandwidth filter
End is connected, and the output end of the first detector is connected with the input terminal of the comparator, believes for real-time detection
Number amplitude and output.
Preferably, the second channel circuit module includes:
Second frequency mixer, the input terminal of second frequency mixer are connected with the output end of the prefilter module
It connects, for radiofrequency signal to be converted to IF frequency；
Second local oscillator, the output end of second local oscillator is connected with the input terminal of second frequency mixer, described
The input terminal of the second local oscillator be connected with the output end of the scanning synchronizing generator, for providing required frequency coverage model
The frequency converter local oscillation signal enclosed；
Second bandpass filter, the output end of the input terminal of second bandpass filter and second frequency mixer
It is connected, it is anti-aliasing for making to carry out；
Second A-D converter, the input terminal of second A-D converter are defeated with second bandpass filter
Outlet is connected, for analog if signal to be transformed into digital signal；
Second digital down converter, the input terminal of second digital down converter and second A-D converter
Output end be connected, for being converted and being extracted to signal, and provide suitable signal rate；
Second digital oscillator, the output end of second digital oscillator and second digital down converter
Input terminal is connected, and the input terminal of second digital oscillator is connected with the output end of the scanning synchronizing generator
It connects, for resulting from the identical digital local oscillator signal of intermediate frequency IF frequency；
Second resolution bandwidth filter, the input terminal of the second resolution bandwidth filter and second number
The output end of word low-converter is connected, for generating the FIR filter of signal analysis resolution ratio；
Second detector, the output of the input terminal of the second detector and the second resolution bandwidth filter
End is connected, and the output end of the second detector is connected with the input terminal of the comparator, believes for real-time detection
Number amplitude and output.
Preferably, the system further includes external display module, the input terminal of the external display module with it is described
The output end of comparison circuit module be connected, for showing output result.
Preferably, the prefilter module includes low-pass filter.
Preferably, the centre frequency of first bandpass filter is IF1, band is wider than the bandwidth of measured signal.
Preferably, in the IF frequency IF1 and second channel circuit module of the first passage circuit module again and again
Rate IF2 has frequency difference Δ f.
Preferably, the Δ f is greater than measured signal actual bandwidth and is greater than RBW filter.
Preferably, the tuning equation of the first passage circuit module, specifically:
First passage circuit module is tuned according to the following formula:
fLO1-fRF=fIF1；
fLO1=fRF+fIF1；
Wherein, fLO1It is the local oscillation signal of first passage circuit module, fIF1For the IF frequency of first passage circuit module,
fRFFrequency is inputted for radio frequency.
Preferably, the tuning equation of the second channel circuit module, specifically:
Second channel circuit module is tuned according to the following formula:
fLO2-fRF=fIF2；
fLO2=fRF+fIF2=fRF+fIF1+Δf；
Wherein, fLO2It is the local oscillation signal of second channel circuit module, fIF1For the IF frequency of first passage circuit module,
fIF2For the IF frequency of second channel circuit module, fRFFrequency is inputted for radio frequency, Δ f is fIF1And fIF2Difference on the frequency.
Using the circuit structure of the invention for realizing UWB signal analysis function based on Single Conversion technology, use
The mode of single-conversion realizes the measurement and analysis of broadband signal, with traditional multistage frequency conversion and single-stage variable-frequency solutions phase
Than, it has the advantage that (1) this programme circuit structure is simple, has the advantages that Single Conversion, the lower power consumption of circuit, reliably
Property improve, and cost is greatly reduced.(2) this programme can realize that wide range frequency covers, while efficiently solve single-stage frequency conversion production
Raw image interference problem.With stronger practicability.(3) signal processing of this programme uses a large amount of Digital Signal Processing skills
Art can be handled in software and FPGA, further simplify the complexity of hardware, meanwhile, hardware is applicability into one
Step provides.
Detailed description of the invention
Fig. 1 is the microwave signal analyzer functional block diagram of the prior art.
Fig. 2 is the scheme schematic diagram of the signal analyzer using single-conversion of the prior art.
Fig. 3 is that the image frequency of the circuit structure of the invention that UWB signal analysis function is realized based on Single Conversion technology is closed
At the output result after detection.
Fig. 4 is the circuit structure of the invention that UWB signal analysis function is realized based on Single Conversion technology using poor
The single-conversion functional block diagram of frequency scheme.
Fig. 5 is the circuit structure of the invention that UWB signal analysis function is realized based on Single Conversion technology using poor
The timesharing Frequency Conversion Theory block diagram of frequency scheme.
Specific embodiment
It is further to carry out combined with specific embodiments below in order to more clearly describe technology contents of the invention
Description.
This realizes the circuit structure of UWB signal analysis function based on Single Conversion technology, wherein the system packet
It includes:
Prefilter module, for inhibiting out of band signal；
First passage circuit module, the input terminal of the first passage circuit module and the prefilter module
Output end is connected, for handling the input signal through wave filter；
Second channel circuit module, the input terminal of the second channel circuit module and the prefilter module
Output end is connected, for handling the input signal through wave filter；
Synchronizing generator is scanned, is connected with the first passage circuit module and second channel circuit module, is used for
The local oscillation signal of synchronization process first passage circuit module and second channel circuit module and digital oscillator frequency and detection
Output；
Comparison circuit module, the input terminal of the comparison circuit module are defeated with the first passage circuit module
Outlet is connected with the output end of second channel circuit module, for comparing two-way DET signal, and the low signal of amplitude is defeated
Out.
As the preferred embodiment of the present invention, the first passage circuit module includes:
First frequency mixer, the input terminal of first frequency mixer are connected with the output end of the prefilter module
It connects, for radiofrequency signal to be converted to IF frequency；
First local oscillator, the output end of first local oscillator is connected with the input terminal of first frequency mixer, described
The input terminal of the first local oscillator be connected with the output end of the scanning synchronizing generator, for providing required frequency coverage model
The frequency converter local oscillation signal enclosed；
First bandpass filter, the output end of the input terminal of first bandpass filter and first frequency mixer
It is connected, it is anti-aliasing for making to carry out；
First A-D converter, the input terminal of first A-D converter are defeated with first bandpass filter
Outlet is connected, for analog if signal to be transformed into digital signal；
First digital down converter, the input terminal of first digital down converter and first A-D converter
Output end be connected, for being converted and being extracted to signal, and provide suitable signal rate；
First digital oscillator, the output end of first digital oscillator and first digital down converter
Input terminal is connected, and the input terminal of first digital oscillator is connected with the output end of the scanning synchronizing generator
It connects, for resulting from the identical digital local oscillator signal of intermediate frequency IF frequency；
First resolution bandwidth filter, the input terminal of the first resolution bandwidth filter and first number
The output end of word low-converter is connected, for generating the FIR filter of signal analysis resolution ratio；
First detector, the output of the input terminal of the first detector and the first resolution bandwidth filter
End is connected, and the output end of the first detector is connected with the input terminal of the comparator, believes for real-time detection
Number amplitude and output.
As the preferred embodiment of the present invention, the second channel circuit module includes:
Second frequency mixer, the input terminal of second frequency mixer are connected with the output end of the prefilter module
It connects, for radiofrequency signal to be converted to IF frequency；
Second local oscillator, the output end of second local oscillator is connected with the input terminal of second frequency mixer, described
The input terminal of the second local oscillator be connected with the output end of the scanning synchronizing generator, for providing required frequency coverage model
The frequency converter local oscillation signal enclosed；
Second bandpass filter, the output end of the input terminal of second bandpass filter and second frequency mixer
It is connected, it is anti-aliasing for making to carry out；
Second A-D converter, the input terminal of second A-D converter are defeated with second bandpass filter
Outlet is connected, for analog if signal to be transformed into digital signal；
Second digital down converter, the input terminal of second digital down converter and second A-D converter
Output end be connected, for being converted and being extracted to signal, and provide suitable signal rate；
Second digital oscillator, the output end of second digital oscillator and second digital down converter
Input terminal is connected, and the input terminal of second digital oscillator is connected with the output end of the scanning synchronizing generator
It connects, for resulting from the identical digital local oscillator signal of intermediate frequency IF frequency；
Second resolution bandwidth filter, the input terminal of the second resolution bandwidth filter and second number
The output end of word low-converter is connected, for generating the FIR filter of signal analysis resolution ratio；
Second detector, the output of the input terminal of the second detector and the second resolution bandwidth filter
End is connected, and the output end of the second detector is connected with the input terminal of the comparator, believes for real-time detection
Number amplitude and output.
Preferably, the system further includes external display module, the input terminal of the external display module with it is described
The output end of comparison circuit module be connected, for showing output result.
Preferably, the prefilter module includes low-pass filter.
As the preferred embodiment of the present invention, the centre frequency of first bandpass filter is IF1, and band is wider than
The bandwidth of measured signal.
As the preferred embodiment of the present invention, the IF frequency IF1 and second of the first passage circuit module is logical
The IF frequency IF2 of road circuit module has frequency difference Δ f.
As the preferred embodiment of the present invention, the Δ f, which is greater than measured signal actual bandwidth and is greater than RBW, to be filtered
Device.
As the preferred embodiment of the present invention, the tuning equation of the first passage circuit module, specifically:
First passage circuit module is tuned according to the following formula:
fLO1-fRF=fIF1；
fLO1=fRF+fIF1；
Wherein, fLO1It is the local oscillation signal of first passage circuit module, fIF1For the IF frequency of first passage circuit module,
fRFFrequency is inputted for radio frequency.
As the preferred embodiment of the present invention, the tuning equation of the second channel circuit module, specifically:
Second channel circuit module is tuned according to the following formula:
fLO2-fRF=fIF2；
fLO2=fRF+fIF2=fRF+fIF1+Δf；
Wherein, fLO2It is the local oscillation signal of second channel circuit module, fIF1For the IF frequency of first passage circuit module,
fIF2For the IF frequency of second channel circuit module, fRFFrequency is inputted for radio frequency, Δ f is fIF1And fIF2Difference on the frequency.
In a specific embodiment of the invention, according to analysis, image frequency is resulted from 2 times of intermediate frequencies of useful signal, such as
Fruit IF frequency changes, and the frequency difference of 2 Δ f can occur for the frequency of image frequency.If transforming to different IF frequency respectively to signal
Rate, the detection output of two intermediate frequencies, is identical on expected frequency, but there are frequency difference in image frequency, and synthesizing after detection can be with
Image frequency is told, as shown in Figure 3.
According to above method, this programme devises following implementation method, as shown in Figure 3.Signal pass through with after filter, together
When enter in channel 1 and channel 2 and handle, channel 1 is identical with the circuit structure in channel 2, the difference of the two be in again and again
There are frequency difference Δ f, BPF1 and BPF2 to be separately tuned at respective IF frequency by rate IF1 and IF2, digital oscillator NCO1 and
The output of NCO2 is identical as IF frequency, and the output in two channels enters comparison circuit COMP, takes minimum signal, is sent to external aobvious
Show output result.The image interference that this circuit can effectively inhibit Single Conversion to generate.
Fig. 4 includes the module of circuit structure, and each functions of modules is described as follows:
Prefilter (Pre Filter): for inhibiting out of band signal, wide-band width measurement uses low-pass filter.
Frequency mixer (Mixer1): 1 frequency mixer of channel, for radiofrequency signal to be converted to IF frequency.
Local oscillator (LO1): the frequency converter local oscillation signal of frequency coverage needed for providing.
Bandpass filter (BPF1): centre frequency is the bandpass filter of IF1, and the bandwidth BW of filter need to be greater than tested letter
Number bandwidth, while there is the characteristic of channel frequency overlapped-resistable filter.
A-D converter (ADC): analog if signal is transformed into digital signal.
Digital down converter (DDC): converting signal and extracted, and suitable signal rate is provided.
Digital oscillator (NCO): the identical digital local oscillator signal of intermediate frequency IF frequency is resulted from.
Resolution bandwidth filter (RBW): for generating the FIR filter of signal analysis resolution ratio.
Wave detector (DET): the amplitude of real time detection signal and output.
Comparator (COMP): being compared two-way DET signal, and the low signal of amplitude is exported.
Scanning synchronizing generator (Sweep Generator): it is the Key Circuit for realizing this programme, is used for synchronization process 2
The local oscillation signal in a channel and digital oscillator frequency and detection output.
The tuning equation in two channels is as follows:
Channel 1:
fLO1-fRF=fIF1；
fLO1=fRF+fIF1；
Channel 2:
fLO2-fRF=fIF2；
fLO2=fRF+fIF2=fRF+fIF1+Δf；
The tuned frequency of LO1 and LO2 differs Δ f, and the selection of Δ f mainly considers two factors, and first is signal measurement band
Width, Δ f have to be larger than measured signal actual bandwidth, and the aliasing of detection is otherwise caused to broadband signal, can not effectively distinguish.Second
It is that Δ f has to be larger than RBW filter.
Above-mentioned technical solution uses Single Conversion scheme, but has used two-way measuring, passes through the letter in two channels
Number amplitude difference, effectively realizes the Image interference problem of Single Conversion.Compared to multistage frequency conversion, circuit structure is greatly simplified.
In view of binary channels is handled simultaneously, for steady-state signal, if two channels can be multiplexed, circuit structure will be into one
Step simplifies.
Functional block diagram behind time-sharing multiplex channel is as shown in Fig. 5, complete one-shot measurement, need local oscillator tune 2 times, first
Secondary to be scanned by IF1, all measurement results save, and are scanned for the second time according to IF2, with corresponding first time scan data
After being compared, output is for display.Compared with attached drawing 4, channel is further simplified by this scheme, increases only a channel band logical
Filter respectively corresponds different IF frequency.But due to Time share scanning, this scheme is only applicable to the measurement of steady-state signal.
Using the circuit structure of the invention for realizing UWB signal analysis function based on Single Conversion technology, use
The mode of single-conversion realizes the measurement and analysis of broadband signal, with traditional multistage frequency conversion and single-stage variable-frequency solutions phase
Than, it has the advantage that (1) this programme circuit structure is simple, has the advantages that Single Conversion, the lower power consumption of circuit, reliably
Property improve, and cost is greatly reduced.(2) this programme can realize that wide range frequency covers, while efficiently solve single-stage frequency conversion production
Raw image interference problem.With stronger practicability.(3) signal processing of this programme uses a large amount of Digital Signal Processing skills
Art can be handled in software and FPGA, further simplify the complexity of hardware, meanwhile, hardware is applicability into one
Step provides.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make
Various modifications and alterations are without departing from the spirit and scope of the invention.Therefore, the description and the appended drawings should be considered as illustrative
And not restrictive.
Claims (10)
1. a kind of circuit structure for realizing UWB signal analysis function based on Single Conversion technology, which is characterized in that described
Circuit structure includes:
Prefilter module, for inhibiting out of band signal；
First passage circuit module, the output of the input terminal of the first passage circuit module and the prefilter module
End is connected, for handling the input signal through wave filter；
Second channel circuit module, the output of the input terminal of the second channel circuit module and the prefilter module
End is connected, for handling the input signal through wave filter；
Synchronizing generator is scanned, is connected with the first passage circuit module and second channel circuit module, for synchronizing
Handle local oscillation signal and digital oscillator frequency and the detection output of first passage circuit module and second channel circuit module；
Comparison circuit module, output end of the input terminal of the comparison circuit module with the first passage circuit module
It is connected with the output end of second channel circuit module, is exported for comparing two-way DET signal, and by the low signal of amplitude.
2. the circuit structure according to claim 1 that UWB signal analysis function is realized based on Single Conversion technology,
It is characterized in that, the first passage circuit module includes:
First frequency mixer, the input terminal of first frequency mixer are connected with the output end of the prefilter module, use
In radiofrequency signal is converted to IF frequency；
First local oscillator, the output end of first local oscillator are connected with the input terminal of first frequency mixer, and described
The input terminal of one local oscillator is connected with the output end of the scanning synchronizing generator, for providing required frequency coverage
Frequency converter local oscillation signal；
First bandpass filter, the input terminal of first bandpass filter are connected with the output end of first frequency mixer
It connects, it is anti-aliasing for making to carry out；
First A-D converter, the output end of the input terminal of first A-D converter and first bandpass filter
It is connected, for analog if signal to be transformed into digital signal；
First digital down converter, the input terminal of first digital down converter are defeated with first A-D converter
Outlet is connected, and for being converted and being extracted to signal, and provides suitable signal rate；
First digital oscillator, the input of the output end of first digital oscillator and first digital down converter
End is connected, and the input terminal of first digital oscillator is connected with the output end of the scanning synchronizing generator, uses
In resulting from the identical digital local oscillator signal of intermediate frequency IF frequency；
Under first resolution bandwidth filter, the input terminal of the first resolution bandwidth filter and first number
The output end of frequency converter is connected, for generating the FIR filter of signal analysis resolution ratio；
First detector, the output end phase of the input terminal of the first detector and the first resolution bandwidth filter
Connection, the output end of the first detector is connected with the input terminal of the comparator, for real time detection signal
Amplitude simultaneously exports.
3. the circuit structure according to claim 1 that UWB signal analysis function is realized based on Single Conversion technology,
It is characterized in that, the second channel circuit module includes:
Second frequency mixer, the input terminal of second frequency mixer are connected with the output end of the prefilter module, use
In radiofrequency signal is converted to IF frequency；
Second local oscillator, the output end of second local oscillator are connected with the input terminal of second frequency mixer, and described
The input terminal of two local oscillators is connected with the output end of the scanning synchronizing generator, for providing required frequency coverage
Frequency converter local oscillation signal；
Second bandpass filter, the input terminal of second bandpass filter are connected with the output end of second frequency mixer
It connects, it is anti-aliasing for making to carry out；
Second A-D converter, the output end of the input terminal of second A-D converter and second bandpass filter
It is connected, for analog if signal to be transformed into digital signal；
Second digital down converter, the input terminal of second digital down converter are defeated with second A-D converter
Outlet is connected, and for being converted and being extracted to signal, and provides suitable signal rate；
Second digital oscillator, the input of the output end of second digital oscillator and second digital down converter
End is connected, and the input terminal of second digital oscillator is connected with the output end of the scanning synchronizing generator, uses
In resulting from the identical digital local oscillator signal of intermediate frequency IF frequency；
Under second resolution bandwidth filter, the input terminal of the second resolution bandwidth filter and second number
The output end of frequency converter is connected, for generating the FIR filter of signal analysis resolution ratio；
Second detector, the output end phase of the input terminal of the second detector and the second resolution bandwidth filter
Connection, the output end of the second detector is connected with the input terminal of the comparator, for real time detection signal
Amplitude simultaneously exports.
4. the circuit structure according to claim 1 that UWB signal analysis function is realized based on Single Conversion technology,
It is characterized in that, the system further includes external display module, and the input terminal of the external display module is compared with described
The output end of circuit module is connected, for showing output result.
5. the circuit structure according to claim 1 that UWB signal analysis function is realized based on Single Conversion technology,
It is characterized in that, the prefilter module includes low-pass filter.
6. the circuit structure according to claim 1 that UWB signal analysis function is realized based on Single Conversion technology,
It is characterized in that, the centre frequency of first bandpass filter is IF1, and band is wider than the bandwidth of measured signal.
7. the circuit structure according to claim 1 that UWB signal analysis function is realized based on Single Conversion technology,
It is characterized in that, the IF frequency IF1 of the first passage circuit module and the IF frequency IF2 tool of second channel circuit module
There is frequency difference Δ f.
8. the circuit structure according to claim 7 that UWB signal analysis function is realized based on Single Conversion technology,
It is characterized in that, the Δ f is greater than measured signal actual bandwidth and is greater than RBW filter.
9. the circuit structure according to claim 1 that UWB signal analysis function is realized based on Single Conversion technology,
It is characterized in that, the tuning equation of the first passage circuit module, specifically:
First passage circuit module is tuned according to the following formula:
fLO1-fRF=fIF1；
fLO1=fRF+fIF1；
Wherein, fLO1It is the local oscillation signal of first passage circuit module, fIF1For the IF frequency of first passage circuit module, fRFFor
Radio frequency inputs frequency.
10. the circuit structure according to claim 1 that UWB signal analysis function is realized based on Single Conversion technology,
It is characterized in that, the tuning equation of the second channel circuit module, specifically:
Second channel circuit module is tuned according to the following formula:
fLO2-fRF=fIF2；
fLO2=fRF+fIF2=fRF+fIF1+Δf；
Wherein, fLO2It is the local oscillation signal of second channel circuit module, fIF1For the IF frequency of first passage circuit module, fIF2
For the IF frequency of second channel circuit module, fRFFrequency is inputted for radio frequency, Δ f is fIF1And fIF2Difference on the frequency.
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