CN111929499B - Signal scanning method of spectrum analyzer and spectrum analyzer - Google Patents
Signal scanning method of spectrum analyzer and spectrum analyzer Download PDFInfo
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- CN111929499B CN111929499B CN202011006526.2A CN202011006526A CN111929499B CN 111929499 B CN111929499 B CN 111929499B CN 202011006526 A CN202011006526 A CN 202011006526A CN 111929499 B CN111929499 B CN 111929499B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/175—Spectrum analysis; Fourier analysis by delay means, e.g. tapped delay lines
Abstract
The invention discloses a signal scanning method of a spectrum analyzer and the spectrum analyzer. The local oscillation module generates the frequency sweep signal of continuous frequency in the preset frequency sweep bandwidth under the trigger of the trigger pulse signal with a plurality of continuous pulses, and each frequency corresponds to the pulse of the trigger pulse signal, so that the input measured signal and the frequency sweep signal of the continuous frequency can be continuously mixed at each frequency to obtain an intermediate frequency signal, namely, the input measured signal can be continuously scanned by the frequency sweep signal of the continuous frequency generated by one-time configuration, the frequency configuration of the frequency sweep signal at each frequency is not needed, and the signal scanning time of the spectrum analyzer is reduced.
Description
Technical Field
The invention relates to the technical field of spectrum analyzers, in particular to a signal scanning method of a spectrum analyzer and a spectrum analyzer.
Background
The spectrum analyzer is an instrument for researching the spectrum characteristics of electric signals, is used for measuring signal parameters such as signal distortion degree, modulation degree, spectrum purity, frequency stability, intermodulation distortion and the like, and is an indispensable measuring instrument in the communication electronic industry.
When a spectrum analyzer performs spectrum analysis on an input measured signal, a local oscillator needs to be configured to generate a frequency modulation signal first, the frequency spectrum analysis can be performed only after the frequency modulation signal performs frequency scanning on the measured signal, the existing spectrum analyzers all adopt a frequency-by-frequency scanning mode, please refer to fig. 6, and fig. 6 is a schematic structural diagram of the existing spectrum analyzer, all frequencies are calculated according to parameters input by a user, a local oscillator module is configured to output a frequency signal corresponding to the frequency according to each frequency, so that a local oscillator needs to be configured once for each frequency, for example, for the measured signal of the current frequency, a local oscillator module needs to be configured to output a frequency modulation signal of the corresponding frequency, the frequency modulation signal mixes the measured signal of the current frequency to an analog-to-digital conversion module of the spectrum analyzer, and then an intermediate frequency processing module is controlled to start data acquisition once to acquire data corresponding to the current frequency, therefore, when the spectrum analyzer scans the measured signal of each frequency, a local oscillator locking process and an intermediate frequency stabilizing process are required once, so that the spectrum analyzer needs to spend the time of the two processes at each frequency, and the scanning time of the measured signal input by the spectrum analyzer is increased.
Disclosure of Invention
The invention mainly solves the technical problem of how to reduce the signal scanning time of a spectrum analyzer.
According to a first aspect, there is provided in an embodiment a method of signal scanning of a spectrum analyzer, comprising:
acquiring signal scanning parameters of a spectrum analyzer;
determining parameters for generating trigger pulse signals, parameters for local oscillator configuration and parameters for intermediate frequency acquisition according to the signal scanning parameters;
generating a trigger pulse signal with a plurality of continuous pulses according to the parameters for generating the trigger pulse signal;
generating a sweep frequency signal with continuous frequency in a preset sweep frequency bandwidth based on the parameters for local oscillator configuration and the trigger pulse signal, wherein the frequency of the sweep frequency signal corresponds to the pulse of the trigger pulse signal;
mixing the input measured signal with the sweep frequency signal of the continuous frequency to obtain an intermediate frequency signal of the continuous frequency;
performing analog-to-digital conversion on the intermediate frequency signal to obtain an intermediate frequency digital signal;
and continuously acquiring the intermediate frequency digital signals according to the parameters for intermediate frequency acquisition, converting the acquired data from a time axis into a frequency axis to obtain frequency information and frequency amplitude information, and displaying the frequency information and the frequency amplitude information on a display screen.
According to a second aspect, there is provided in an embodiment a spectrum analyser comprising:
the parameter calculation module is used for acquiring signal scanning parameters of the spectrum analyzer;
the scanning control module is used for determining parameters for generating trigger pulse signals, parameters for local oscillator configuration and parameters for intermediate frequency acquisition according to the signal scanning parameters, and realizing the functions of starting scanning and stopping scanning;
the pulse generation module is used for generating a trigger pulse signal with a plurality of continuous pulses according to the parameters for generating the trigger pulse signal;
the local oscillation module is used for generating a sweep frequency signal with continuous frequency in a preset sweep frequency bandwidth based on the parameter for local oscillation configuration and the trigger pulse signal, wherein the frequency of the sweep frequency signal corresponds to the pulse of the trigger pulse signal;
the frequency mixing module is used for carrying out frequency mixing processing on the input measured signal and the sweep frequency signal with the continuous frequency to obtain an intermediate frequency signal with the continuous frequency;
the analog-to-digital conversion module is used for performing analog-to-digital conversion on the intermediate frequency signal to obtain an intermediate frequency digital signal;
the intermediate frequency processing module is used for continuously acquiring the intermediate frequency digital signals according to the parameters for intermediate frequency acquisition and converting the acquired data from a time axis into a frequency axis to obtain frequency information and frequency amplitude information;
and the display screen is used for displaying the frequency information and the frequency amplitude information.
According to the signal scanning method of the spectrum analyzer and the spectrum analyzer in the embodiment, the local oscillation module generates the frequency sweeping signals of continuous frequencies in the preset frequency sweeping bandwidth under the trigger of the trigger pulse signals with a plurality of continuous pulses, each frequency corresponds to the pulse of the trigger pulse signals, so that the input measured signals and the frequency sweeping signals of the continuous frequencies can be continuously mixed at each frequency to obtain intermediate frequency signals of the continuous frequencies, namely the input measured signals can be continuously scanned by the frequency sweeping signals of the continuous frequencies generated through one-time configuration, the frequency configuration of the frequency sweeping signals at each frequency is not needed, and the signal scanning time of the spectrum analyzer is reduced.
Drawings
FIG. 1 is a schematic diagram of a spectrum analyzer according to an embodiment;
FIG. 2 is a graph of frequency versus time for a frequency sweep signal for both an ideal case and a real case;
FIG. 3 is a schematic diagram of a frequency sweep signal and a trigger signal;
FIG. 4 is a schematic diagram of a sweep frequency signal, a trigger pulse signal, an acquisition enable signal, and a delayed acquisition enable signal;
FIG. 5 is a flow diagram of a signal scanning method of a spectrum analyzer of an embodiment;
fig. 6 is a schematic diagram of a conventional spectrum analyzer.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, fig. 1 is a schematic structural diagram of a spectrum analyzer according to an embodiment, where the spectrum analyzer includes a parameter calculation module 101, a scan control module 102, a pulse generation module 103, a local oscillation module 104, a frequency mixing module 105, an analog-to-digital conversion module 106, a data acquisition control module 107, an intermediate frequency processing module 108, and a display screen 109.
The parameter calculation module 101 is configured to obtain signal scanning parameters of the spectrum analyzer. In the spectrum analyzer, the signal sweep parameters that the user can input for setting are the start frequency, the stop frequency and the Resolution Bandwidth (RBW).
The scan control module 102 is configured to determine, according to the signal scan parameter, a parameter for generating a trigger pulse signal, a parameter for local oscillator configuration, and a parameter for intermediate frequency acquisition, and implement a scan start function and a scan stop function.
In this embodiment, the sweep bandwidth Span and the sweep time ST of the spectrum analyzer signal sweep are determined from the start frequency and the stop frequency, where Span = stop frequency-start frequency, ST = Span/(RBW).
Referring to fig. 2, in an ideal case, the frequency of the frequency sweep signal should change linearly with the scanning time within the frequency sweep bandwidth Span as shown by a straight line in fig. 2, however, in a real case, the time step value Δ t and the frequency step value Δ f of the frequency sweep signal both have the minimum resolution as shown by a continuous broken line in fig. 2, that is, the frequency sweep signal is triggered to change its frequency once according to the frequency step value Δ f when the scanning time passes through the time step value Δ t, so the parameters for generating the pulse signal in this embodiment include a pulse period, which is the time step value Δ t, the parameters for configuring the local oscillator in this embodiment include the frequency step value Δ f, since the frequency range of the frequency sweep signal needs to be within the frequency sweep bandwidth Span, therefore, the parameters for configuring the local oscillator further include a start frequency and a stop frequency for determining the scanning bandwidth Span, the start frequency and the stop frequency can be directly obtained through the signal scanning parameters input by the user, and the embodiment only needs to calculate the time step value Δ t (the pulse period of the trigger pulse signal) and the frequency step value Δ f.
In the present embodiment, if Span/(ST/. DELTA. tmin) > =:,/; Δ t =Δtmin, Δ f = Span/(ST/. DELTA tmin); if Span/(ST/. DELTA.tmin) = <. DELTA.fmin; then Δ f =Δfmin, Δ t = ST/(Span/Δf). Where Δ tmin is the minimum time step value and Δ fmin is the minimum frequency step value, which are determined by the hardware characteristics of the spectrum analyzer.
In this embodiment, the intermediate frequency acquisition parameters include an acquisition period Ts and an acquisition point number Sweep _ point, and the acquisition period is determined according to the size of the RBW, and is defined as 1/(RBW/10); the number of acquisition points is calculated according to the acquisition period and the scanning time, and Sweep _ poin = ST/Ts.
In addition, after completing the calculation of the parameters for generating the trigger pulse signal and the parameters for local oscillator configuration, the scan control module 102 needs to configure the calculated parameters, and after completing the configuration, sends a start scan signal to the pulse generation module 103 and the data acquisition control module 107 to start the scan signal to start working; and after finishing signal scanning, sending a scanning stopping signal to the pulse generation module 103 and the data acquisition control module 107 so as to stop working.
The pulse generation module 103 is configured to generate a trigger pulse signal having a plurality of continuous pulses according to a parameter for generating the trigger pulse signal.
The pulse generating module 103 in this embodiment generates a trigger pulse signal according to a pulse period (time step value Δ t) after receiving a start scanning signal sent by the scanning control module 102, where each pulse in the trigger pulse signal has the same pulse period.
The local oscillation module 104 is configured to generate a frequency sweep signal with a continuous frequency within a preset frequency sweep bandwidth based on the parameter for local oscillation configuration and the trigger pulse signal, where the frequency of the frequency sweep signal corresponds to a pulse of the trigger pulse signal.
In this embodiment, the local oscillation module 104 generates a frequency sweeping signal with an initial frequency as the starting frequency according to the starting frequency and the scanning time ST, where the frequency sweeping signal has only one frequency.
And performing pulse triggering on the sweep frequency signal by using a trigger pulse signal, wherein the current frequency of the sweep frequency signal is changed once according to a frequency stepping value delta f every time the sweep frequency signal is triggered, namely the frequency of the sweep frequency signal is changed from the initial frequency to the stop frequency through multiple times of triggering according to the frequency stepping value delta f under the triggering of the trigger pulse signal, so that the sweep frequency signal can be obtained, in other words, the sweep frequency signal has continuous frequency increasing according to the frequency stepping value delta f in the sweep frequency bandwidth Span.
Referring to fig. 3, the frequency of the sweep frequency signal in fig. 3 is changed between the start frequency Freq _ start and the stop frequency Freq _ stop, and the frequency of the trigger pulse signal is changed every time step Δ t.
The scanning local oscillation module 104 in this embodiment may be composed of a phase-locked loop, and may configure the frequency of the scanning local oscillation module to output the frequency-sweeping signal in real time, and may also receive the trigger pulse signal to implement frequency sweeping, and the frequency changes once according to the frequency step value Δ f when receiving one trigger pulse.
The frequency mixing module 105 is configured to perform frequency mixing processing on the input measured signal and the sweep frequency signal with continuous frequency to obtain an intermediate frequency signal with continuous frequency.
The mixing module 105 in this embodiment can be implemented by an existing mixer, such as a triode mixer and a diode mixer, which can convert the signal to be measured from one frequency to another frequency. That is, the frequency-sweeping signal generated by the scanning local oscillator module 104 is mixed with the measured signal to obtain a signal with an intermediate frequency.
The analog-to-digital conversion module 106 is configured to perform analog-to-digital conversion on the intermediate frequency signal to obtain an intermediate frequency digital signal.
The intermediate frequency processing module 108 is used for acquiring and processing digital intermediate frequency signals after digital-to-analog conversion according to acquisition parameters, the processing comprises a series of processes of orthogonal digital down conversion, extraction, a RBW filter, a detector, a VBW filter and the like, and finally, the data after VBW filtering can be acquired according to acquisition enabling of the data acquisition control module 107, the acquisition period is TS, the acquisition point is Sweep _ point, the time axis of the acquired data is converted into a frequency axis, and the conversion rule is that the data with the preset acquisition point Sweep _ point number is uniformly mapped into the whole SPAN.
The display screen 109 is used to display the spectrum signal. In this embodiment, the display driving module 110 is further required to drive the display screen for displaying.
In this embodiment, the if processing module 108 needs to process the digital if signal output by the adc module 106 under the control of the acquisition enable signal. Therefore, the embodiment of the present invention further includes a data acquisition control module 107, configured to generate an acquisition enable signal according to the signal scanning parameter; wherein the acquisition enable signal is used for processing the intermediate frequency digital signal when the acquisition enable signal is at an effective level.
After receiving the scan start signal sent by the scan control module 102, the data acquisition control module 107 switches the acquisition enable signal from an invalid level to an active level, that is, when the frequency of the sweep signal is within a preset sweep bandwidth, the acquisition enable signal is an active level, and when the frequency of the sweep signal is in the rest of the time periods, the acquisition enable signal is an invalid level, so that the intermediate frequency processing module 108 starts to process the digital intermediate frequency signal when the acquisition enable signal is an active level.
In order to avoid this, please refer to fig. 4, the initial frequency of the frequency sweep signal is usually advanced from the initial frequency Freq _ start to Freq _ pre, so that the entire intermediate frequency processing module 108 is just stabilized when the frequency sweep signal reaches the initial frequency, and at this time, the digital intermediate frequency signal after the frequency mixing and the intermediate frequency analog-to-digital conversion of the measured signal is just input into the stabilized intermediate frequency processing module 108 for processing.
In addition, in an ideal situation, when the radio frequency interface of the spectrum analyzer receives an input measured signal, the if processing module 108 may acquire and process a digital if signal, but in a real situation, there are various delays when the input measured signal passes through various hardware such as the frequency mixing module and the analog-to-digital conversion module, and therefore a certain delay may be generated when the initial frequency Freq _ start is advanced to Freq _ pre, and there is a hardware delay when the if processing module 108 receives the digital if signal, therefore, in this embodiment, the effective level and the invalid average of the acquisition enable signal are delayed according to the preset delay by the preset delay, where the preset delay is a sum of the delay of the initial frequency advance of the frequency sweep signal and the hardware delay.
Referring to fig. 5, fig. 5 is a flowchart illustrating a signal scanning method of a spectrum analyzer according to an embodiment, where the signal scanning method includes steps S10 to S70, which is described in detail below.
Step S10, acquiring signal scan parameters of the spectrum analyzer. In the spectrum analyzer, the signal sweep parameters that the user can input for setting are the start frequency, the stop frequency and the Resolution Bandwidth (RBW).
Step S20, determining parameters for generating trigger pulse signals, parameters for local oscillator configuration, and parameters for intermediate frequency acquisition according to the signal scanning parameters.
In this embodiment, the sweep bandwidth Span and the sweep time ST of the spectrum analyzer signal sweep are determined from the start frequency and the stop frequency, where Span = stop frequency-start frequency, ST = Span/(RBW).
Referring to fig. 2, in an ideal case, the frequency of the frequency sweep signal should change linearly with the scanning time within the frequency sweep bandwidth Span as shown by a straight line in fig. 2, however, in a real case, the time step value Δ t and the frequency step value Δ f of the frequency sweep signal both have the minimum resolution as shown by a continuous broken line in fig. 2, that is, the frequency sweep signal is triggered to change its frequency once according to the frequency step value Δ f when the scanning time passes through the time step value Δ t, so the parameters for generating the pulse signal in this embodiment include a pulse period, which is the time step value Δ t, the parameters for configuring the local oscillator in this embodiment include the frequency step value Δ f, since the frequency range of the frequency sweep signal needs to be within the frequency sweep bandwidth Span, therefore, the parameters for configuring the local oscillator further include a start frequency and a stop frequency for determining the scanning bandwidth Span, the start frequency and the stop frequency can be directly obtained through the signal scanning parameters input by the user, and the embodiment only needs to calculate the time step value Δ t (the pulse period of the trigger pulse signal) and the frequency step value Δ f.
In the present embodiment, if Span/(ST/. DELTA. tmin) > =:,/; Δ t =Δtmin, Δ f = Span/(ST/. DELTA tmin); if Span/(ST/. DELTA.tmin) = <. DELTA.fmin; then Δ f =Δfmin, Δ t = ST/(Span/Δf). Where Δ tmin is the minimum time step value and Δ fmin is the minimum frequency step value, which are determined by the hardware characteristics of the spectrum analyzer.
In this embodiment, the intermediate frequency acquisition parameters include an acquisition period Ts and an acquisition point number Sweep _ point, and the acquisition period is determined according to the size of the RBW, and is defined as 1/(RBW/10); the number of acquisition points is calculated according to the acquisition period and the scanning time, and Sweep _ poin = ST/Ts.
In step S30, a trigger pulse signal having a plurality of continuous pulses is generated based on the parameters for generating the trigger pulse signal. That is, a trigger pulse signal is generated according to a pulse period (time step value Δ t), wherein each pulse in the trigger pulse signal has the same pulse period.
And step S40, generating a sweep frequency signal with continuous frequency in a preset sweep frequency bandwidth based on the parameters for local oscillator configuration and the trigger pulse signal, wherein the frequency of the sweep frequency signal corresponds to the pulse of the trigger pulse signal.
In this embodiment, the sweep signal with the initial frequency as the start frequency is generated according to the start frequency and the sweep time ST, and the sweep signal has only one frequency.
When the trigger pulse signal is triggered once, the current frequency of the sweep frequency signal changes once according to the frequency stepping value Δ f, that is, the frequency of the sweep frequency signal is changed from the initial frequency to the stop frequency through multiple triggering according to the frequency stepping value Δ f under the triggering of the trigger pulse signal by the initial sweep frequency signal, so as to obtain the sweep frequency signal, in other words, the sweep frequency signal has continuous frequency increasing according to the frequency stepping value Δ f in the sweep frequency bandwidth Span.
And step S50, mixing the input measured signal with the sweep frequency signal of continuous frequency to obtain an intermediate frequency signal of continuous frequency.
In this embodiment, the mixing process may be performed by an existing mixer, such as a triode mixer and a diode mixer, which may convert the signal to be measured from one frequency to another frequency. That is, the frequency-sweeping signal generated by the scanning local oscillator module 104 is mixed with the measured signal to obtain a signal with an intermediate frequency.
And step S60, performing analog-to-digital conversion on the intermediate frequency signal to obtain an intermediate frequency digital signal.
And step S70, continuously collecting the digital intermediate frequency signals according to the parameters of intermediate frequency collection, converting the collected data from a time axis into a frequency axis to obtain frequency information and frequency amplitude information, and displaying the frequency information and the frequency amplitude information on a display screen.
When the digital intermediate frequency signals are continuously acquired, one data is acquired in each acquisition period, the acquired data is converted into a frequency axis from a time axis, and the conversion rule is that the data with the preset number of acquisition points is uniformly mapped into the preset sweep frequency bandwidth.
The embodiment needs to perform time domain to frequency domain conversion on the digital intermediate frequency signal under the control of the acquisition enable signal. Therefore, the embodiment of the invention further comprises: generating an acquisition enabling signal according to the signal scanning parameters; the acquisition enabling signal is used for converting the time domain to the frequency domain of the intermediate digital signal when the acquisition enabling signal is at the effective level.
In this embodiment, when the frequency of the sweep frequency signal is within the preset sweep frequency bandwidth, the acquisition enable signal is at an active level, and when the frequency of the sweep frequency signal is within the preset sweep frequency bandwidth, the acquisition enable signal is at an inactive level, so that when the acquisition enable signal is at an active level, the digital intermediate frequency signal starts to be processed.
Because a series of processing processes including quadrature digital down-conversion, decimation, RBW filter, detector and VBW filter, etc. are performed during the process of time-domain conversion of the digital intermediate frequency signal to the frequency domain, these processing processes need a period of time to enter a stable state, that is, the digital intermediate frequency signal that enters the intermediate frequency processing at the beginning may be subjected to the above-mentioned series of processing in an unstable state.
In addition, in an ideal situation, when the radio frequency interface of the spectrum analyzer receives an input measured signal, the digital intermediate frequency signal can be processed, but in a real situation, various delays exist when the input measured signal passes through various hardware such as a mixer and analog-to-digital conversion, so that a certain delay exists in advance in the initial frequency Freq _ start, and a certain delay exists in the hardware of the spectrum analyzer, so that the effective level and the invalid average of the collected enable signal are delayed according to the preset delay through the preset delay, wherein the preset delay is the sum of the delay of the initial frequency of the sweep signal in advance and the hardware delay.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (9)
1. A method for signal scanning by a spectrum analyzer, comprising:
acquiring signal scanning parameters of a spectrum analyzer;
determining parameters for generating trigger pulse signals, parameters for local oscillator configuration and parameters for intermediate frequency acquisition according to the signal scanning parameters;
generating a trigger pulse signal with a plurality of continuous pulses according to the parameters for generating the trigger pulse signal;
generating a sweep frequency signal with continuous frequency in a preset sweep frequency bandwidth based on the parameters for local oscillator configuration and the trigger pulse signal, wherein the frequency of the sweep frequency signal corresponds to the pulse of the trigger pulse signal;
mixing the input measured signal with the sweep frequency signal of the continuous frequency to obtain an intermediate frequency signal of the continuous frequency;
performing analog-to-digital conversion on the intermediate frequency signal to obtain an intermediate frequency digital signal;
according to the parameters for collecting the intermediate frequency, continuously collecting the intermediate frequency digital signals, converting the collected data from a time axis into a frequency axis to obtain frequency information and frequency amplitude information, and displaying the frequency information and the frequency amplitude information on a display screen;
the parameters for generating the trigger pulse signal include: a pulse period;
the parameters for local oscillator configuration include: a start frequency, a frequency step value, and a stop frequency;
the parameters for intermediate frequency acquisition include: collecting points and collecting period;
wherein, if Span/(ST/. DELTA.tmin) >. DELTA.fmin; Δ t =Δtmin, Δ f = Span/(ST/. DELTA tmin); if Span/(ST/. DELTA.tmin) is less than or equal to Δ fmin; then Δ f =Δfmin, Δ t = ST/(Span/Δf);
wherein, Δ tmin is the minimum time step value, Δ fmin is the minimum frequency step value, Span is the sweep frequency bandwidth, ST is the sweep time, Δ t is the pulse period, and Δ f is the frequency step value.
2. The method for signal scanning of a spectrum analyzer as claimed in claim 1, comprising:
generating an acquisition enabling signal according to the signal scanning parameters; the acquisition enabling signal is synchronous with the trigger pulse signal, and when the acquisition enabling signal is at an effective level, the intermediate frequency digital signal is continuously acquired.
3. The method for signal scanning of a spectrum analyzer as claimed in claim 2, wherein the generating an acquisition enable signal based on the signal scanning parameters comprises:
when the frequency of the sweep frequency signal is within a preset sweep frequency bandwidth, the acquisition enabling signal is an effective level, and when the frequency of the sweep frequency signal is within the preset sweep frequency bandwidth, the acquisition enabling signal is an ineffective level;
or, when the frequency of the sweep frequency signal is within a preset sweep frequency bandwidth, the collection enable signal is an effective level, and when the frequency of the sweep frequency signal is within the preset sweep frequency bandwidth, the collection enable signal is an ineffective level;
acquiring a preset delay;
and carrying out delay processing on the effective level and the invalid power average of the acquisition enabling signal according to a preset delay, wherein the value of the preset delay is related to the delay of the whole path from the frequency mixing of the signal to be detected to the digital intermediate frequency.
4. The method for signal scanning of a spectrum analyzer as claimed in claim 1, wherein the generating a sweep signal of continuous frequency within a preset sweep bandwidth based on the parameters for local oscillator configuration and the trigger pulse signal comprises:
determining the starting frequency, the frequency stepping value and the stopping frequency of the frequency sweeping signal based on the parameters for the local oscillator configuration;
setting the initial frequency of the sweep frequency signal as an initial frequency, and changing the current frequency of the sweep frequency signal triggered by each pulse of the trigger pulse signal according to a frequency step value until the current frequency of the sweep frequency signal is greater than a stop frequency, so as to obtain the sweep frequency signal with continuous frequency.
5. The method for signal scanning of a spectrum analyzer as claimed in claim 2, wherein the acquiring of the intermediate frequency digital signal in succession, the converting of the acquired data from the time axis to the frequency axis to obtain frequency information and frequency amplitude information, comprises:
when the acquisition enabling signal is at an effective level, the digital intermediate frequency signal is continuously acquired according to the parameters for intermediate frequency acquisition, one data is acquired in each acquisition period, then the acquired data is converted into a frequency axis from a time axis, and the conversion rule is that the data with the preset number of acquisition points is uniformly mapped into the preset sweep frequency bandwidth.
6. A spectrum analyzer, comprising:
the parameter calculation module is used for acquiring signal scanning parameters of the spectrum analyzer;
the scanning control module is used for determining parameters for generating trigger pulse signals, parameters for local oscillator configuration and parameters for intermediate frequency acquisition according to the signal scanning parameters, and realizing the functions of starting scanning and stopping scanning;
the pulse generation module is used for generating a trigger pulse signal with a plurality of continuous pulses according to the parameters for generating the trigger pulse signal;
the local oscillation module is used for generating a sweep frequency signal with continuous frequency in a preset sweep frequency bandwidth based on the parameter for local oscillation configuration and the trigger pulse signal, wherein the frequency of the sweep frequency signal corresponds to the pulse of the trigger pulse signal;
the frequency mixing module is used for carrying out frequency mixing processing on the input measured signal and the sweep frequency signal with the continuous frequency to obtain an intermediate frequency signal with the continuous frequency;
the analog-to-digital conversion module is used for performing analog-to-digital conversion on the intermediate frequency signal to obtain an intermediate frequency digital signal;
the intermediate frequency processing module is used for continuously acquiring the intermediate frequency digital signals according to the parameters for intermediate frequency acquisition and converting the acquired data from a time axis into a frequency axis to obtain frequency information and frequency amplitude information;
the display screen is used for displaying the frequency information and the frequency amplitude information;
the parameters for generating the trigger pulse signal include: a pulse period;
the parameters for local oscillator configuration include: a start frequency, a frequency step value, and a stop frequency;
the parameters for intermediate frequency acquisition include: collecting points and collecting period;
wherein, if Span/(ST/. DELTA.tmin) >. DELTA.fmin; Δ t =Δtmin, Δ f = Span/(ST/. DELTA tmin); if Span/(ST/. DELTA.tmin) is less than or equal to Δ fmin; then Δ f =Δfmin, Δ t = ST/(Span/Δf);
wherein, Δ tmin is the minimum time step value, Δ fmin is the minimum frequency step value, Span is the sweep frequency bandwidth, ST is the sweep time, Δ t is the pulse period, and Δ f is the frequency step value.
7. The spectrum analyzer of claim 6, further comprising:
the data acquisition control module is used for generating an acquisition enabling signal according to the signal scanning parameters; the acquisition enabling signal is used for continuously acquiring the intermediate frequency digital signal when the acquisition enabling signal is at an effective level.
8. The spectrum analyzer of claim 7, wherein the generating an acquisition enable signal based on the signal scan parameters comprises:
when the frequency of the sweep frequency signal is within a preset sweep frequency bandwidth, the acquisition enabling signal is an effective level, and when the frequency of the sweep frequency signal is within the preset sweep frequency bandwidth, the acquisition enabling signal is an ineffective level;
or, when the frequency of the sweep frequency signal is within a preset sweep frequency bandwidth, the collection enable signal is an effective level, and when the frequency of the sweep frequency signal is within the preset sweep frequency bandwidth, the collection enable signal is an ineffective level;
acquiring a preset delay;
and carrying out time delay processing on the effective level and the ineffective power average of the acquisition enabling signal according to preset time delay.
9. The spectrum analyzer of claim 6, wherein generating a swept frequency signal having a plurality of frequencies based on the parameters for local oscillator configuration and the trigger pulse signal comprises:
determining the starting frequency, the frequency stepping value and the stopping frequency of the frequency sweeping signal based on the parameters for the local oscillator configuration;
setting the initial frequency of the sweep frequency signal as an initial frequency, and changing the current frequency of the sweep frequency signal triggered by each pulse of the trigger pulse signal according to a frequency step value until the current frequency of the sweep frequency signal is greater than a stop frequency, so as to obtain the sweep frequency signal with continuous frequency.
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