CN207706424U - A kind of directional audio signal detection device based on FFT - Google Patents
A kind of directional audio signal detection device based on FFT Download PDFInfo
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Abstract
The utility model belongs to radio-positioning direction finder technical field, discloses a kind of directional audio signal detection device based on FFT, and directional audio signal detection device includes：Directional aerial, finder and display；The finder includes：Receiving unit and control unit；Wherein, the RF output end of the directional aerial is connect with the rf inputs of the receiving unit, the audio output of the receiving unit is connect with the audio input end of the audio input end of the directional aerial and control unit respectively, the bearing signal output end of the directional aerial and the bearing signal input terminal of described control unit connect, the data output end of described control unit and the data input pin of display connect, can the obtained bearing signal of automatic decision direction finder it is whether effective, and when bearing signal is invalid, do not export bearing signal.
Description
Technical field
The utility model belongs to radio-positioning direction finder technical field more particularly to a kind of directional audio based on FFT
Signal supervisory instrument.
Background technology
Direction finder is important navigation equipment, it can carry out radio incoming wave signal orientation is continuously tracked；It is main to use
In the vertical polarization signal of reception VHF/UHF frequency ranges, and provide relevant azimuth information.It is formed together with synthesis display equipment
Automatic orientation system realizes the orientation task dispatching of direction finder.
It when direction finder receives the radiofrequency signal that objective emission source orientation is come, can be accurately positioned, export digital orientation letter
Number, complete the positioning function of direction finder；In the prior art, direction finder pilot passes through headphone monitor directional audio signal
Whether (5.68KHz) be effective to judge directional bearing signal at this time, is judged as when listening to apparent audio signal effectively
Bearing signal；It is judged as null orientation signal when what is listened to is noise, therefore, the prior art is by artificially determining whether
When effective bearing signal, it is desirable that monitoring personnel have higher technical merit, and wasting manpower and material resources.
Utility model content
In view of the above-mentioned problems, the purpose of this utility model is to provide a kind of, the directional audio signal detection based on FFT fills
Set, can the obtained bearing signal of automatic decision direction finder it is whether effective, and when bearing signal is invalid, do not export orientation letter
Number.
In order to achieve the above objectives, the utility model adopts the following technical solution is achieved.
Technical solution one：
A kind of directional audio signal detection device based on FFT, the directional audio signal detection device include：Orient day
Line, finder and display；The finder includes：Receiving unit and control unit；
Wherein, the RF output end of the directional aerial is connect with the rf inputs of the receiving unit, the reception
The audio output of unit is connect with the audio input end of the audio input end of the directional aerial and control unit respectively, described
The bearing signal output end of directional aerial and the bearing signal input terminal of described control unit connect, the data of described control unit
The data input pin of output end and display connects；
Described control unit includes：Sequentially connected three-phase A/D conversion modules, audio A/D conversion modules, FPGA module and
DSP signal processing modules, the signal input parts of the three-phase A/D conversion modules as control unit audio input end with it is described
The audio input end of directional aerial connects, the data output end of the output ends of the DSP signal processing modules as control unit
It is connect with the data input pin of the display.
It the characteristics of technical solutions of the utility model one and is further improved to：
(1) the three-phase A/D conversion modules are realized using SDC2904-2112-D chips.
(2) audio A/D conversion modules are realized using AD9780 chips.
(3) FPGA module is realized using EP3C10F256 chips.
(4) the DSP signal processing modules are realized using TMS320VC5509A chips.
(5) frequency of setting directional audio signal is f；
The directional aerial is modulated the radiofrequency signal to obtain radio frequency for the radiofrequency signal in reception space
Modulated signal, and the rf modulated signal is sent to the receiving unit of finder, the rf modulated signal is swept with antenna
There are a phase differences between the reference signal retouched；
The receiving unit of the finder, for carrying out frequency-selecting, frequency conversion, amplification and inspection successively to the rf modulated signal
Wave processing, obtains the audio signal with orientation, and the audio signal with orientation is sent respectively to control unit and orientation
Antenna；
The directional aerial is additionally operable to the audio signal with orientation being amplified successively, filter and phase demodulation processing,
Simulated-azimuth signal is obtained, and the simulated-azimuth signal is sent to the control unit of finder；
The control unit of the finder obtains institute for the simulated-azimuth signal to be converted to digital bearing signal
State the launch azimuth information of radiofrequency signal；
The control unit of the finder is additionally operable to being converted to the audio signal with orientation into the digital sound with orientation
Frequency signal samples the digital audio and video signals with orientation to obtain sampled data, and carries out FFT to the sampled data
Transformation obtains the amplitude-versus-frequency curve of sampled data, is judged in preset amplitude according to the amplitude-versus-frequency curve of the sampled data
It whether there is frequency f in threshold range, and if it exists, then described control unit exports the launch azimuth information of the radiofrequency signal,
Otherwise, control unit exports the information without effective target signal.
(6) the three-phase A/D conversion modules in described control unit, for the simulated-azimuth signal to be converted to number side
Position signal, obtains the launch azimuth information of the radiofrequency signal；
Audio A/D conversion modules in described control unit, for the audio signal with orientation to be converted to band side
The digital audio and video signals of position, and the digital audio and video signals with orientation are sent to FPGA module；
FPGA module in described control unit is adopted for being sampled to the digital audio and video signals with orientation
Sample data, and give the sampling data transmitting to DSP signal processing modules；
DSP signal processing modules in described control unit are sampled for carrying out FFT transform to the sampled data
The amplitude-versus-frequency curve of data, judged according to the amplitude-versus-frequency curve of the sampled data be within the scope of preset amplitude threshold
No there are frequency f, and if it exists, then exports the launch azimuth information of the radiofrequency signal, otherwise, exports without effective target signal
Information.
Technical solution two：
A kind of directional audio signal detection method based on FFT, the detection method are applied to as described in technical solution one
Detection device, the directional audio signal detection method includes：Set the frequency f of directional audio signal；
Radiofrequency signal in directional aerial reception space is modulated the radiofrequency signal to obtain rf modulated signal,
And the rf modulated signal is sent to the receiving unit of finder, the benchmark letter of the rf modulated signal and antenna scanning
There are a phase differences between number；
The receiving unit of finder carries out the rf modulated signal frequency-selecting, frequency conversion, amplification and detection processing successively, obtains
It is sent respectively to control unit and directional aerial to the audio signal with orientation, and by the audio signal with orientation；
The audio signal with orientation is amplified by the directional aerial successively, filters and phase demodulation processing, obtains mould
Intend bearing signal, and the simulated-azimuth signal is sent to the control unit of finder；
The simulated-azimuth signal is converted to digital bearing signal by the control unit of finder, obtains the radiofrequency signal
Launch azimuth information；
The audio signal with orientation is converted to the digital audio and video signals with orientation by the control unit of the finder,
The digital audio and video signals with orientation are sampled to obtain sampled data, and FFT transform is carried out to the sampled data and is obtained
To the amplitude-versus-frequency curve of sampled data, judged in preset amplitude threshold model according to the amplitude-versus-frequency curve of the sampled data
It whether there is frequency f in enclosing, and if it exists, then described control unit exports the launch azimuth information of the radiofrequency signal, otherwise, control
Unit processed exports the information without effective target signal.
Directional audio signal detection method of the use based on fft algorithm that the utility model embodiment provides, can it is intuitive,
Effectively judge whether there is effective bearing signal, when effective bearing signal, display orientation signal；Otherwise it shows without effectively
Bearing signal；Simple and clear, objectivity is strong.
Description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, other drawings may also be obtained based on these drawings.
Fig. 1 is that a kind of structure for directional audio signal detection device based on FFT that the utility model embodiment provides is shown
It is intended to；
Fig. 2 is the structural schematic diagram for the control unit that the utility model embodiment provides；
Fig. 3 is a kind of knot flow for directional audio signal detection method based on FFT that the utility model embodiment provides
Schematic diagram；
Fig. 4 is the workflow schematic diagram of the directional audio signal inspection software based on FFT.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
The utility model embodiment provides a kind of directional audio signal detection device based on FFT, as shown in Figure 1, described
Directional audio signal detection device includes：Directional aerial, finder and display；The finder includes：Receiving unit and
Control unit；
Wherein, the RF output end of the directional aerial is connect with the rf inputs of the receiving unit, the reception
The audio output of unit is connect with the audio input end of the audio input end of the directional aerial and control unit respectively, described
The bearing signal output end of directional aerial and the bearing signal input terminal of described control unit connect, the data of described control unit
The data input pin of output end and display connects；
Specifically, as shown in Fig. 2, described control unit includes：Sequentially connected three-phase A/D conversion modules, audio A/D turn
Block, FPGA module and DSP signal processing modules are changed the mold, the signal input part of the three-phase A/D conversion modules is as control unit
Audio input end connect with the audio input end of the directional aerial, the output ends of the DSP signal processing modules is as control
The data output end of unit processed is connect with the data input pin of the display.
Specifically, the three-phase A/D conversion modules are realized using SDC2904-2112-D chips.
The audio A/D conversion modules are realized using AD9780 chips.
The FPGA module is realized using EP3C10F256 chips.
The DSP signal processing modules are realized using TMS320VC5509A chips.
Further, the frequency that directional audio signal is arranged is f, then：
The directional aerial is modulated the radiofrequency signal to obtain radio frequency for the radiofrequency signal in reception space
Modulated signal, and the rf modulated signal is sent to the receiving unit of finder, the rf modulated signal is swept with antenna
There are a phase differences between the reference signal retouched；
The receiving unit of the finder, for carrying out frequency-selecting, frequency conversion, amplification and inspection successively to the rf modulated signal
Wave processing, obtains the audio signal with orientation, and the audio signal with orientation is sent respectively to control unit and orientation
Antenna；
The directional aerial is additionally operable to the audio signal with orientation being amplified successively, filter and phase demodulation processing,
Simulated-azimuth signal is obtained, and the simulated-azimuth signal is sent to the control unit of finder；
The control unit of the finder obtains institute for the simulated-azimuth signal to be converted to digital bearing signal
State the launch azimuth information of radiofrequency signal；
The control unit of the finder is additionally operable to being converted to the audio signal with orientation into the digital sound with orientation
Frequency signal samples the digital audio and video signals with orientation to obtain sampled data, and carries out FFT to the sampled data
Transformation obtains the amplitude-versus-frequency curve of sampled data, is judged in preset amplitude according to the amplitude-versus-frequency curve of the sampled data
It whether there is frequency f in threshold range, and if it exists, then described control unit exports the launch azimuth information of the radiofrequency signal,
Otherwise, control unit exports the information without effective target signal.
Specifically,
Three-phase A/D conversion modules in described control unit, for the simulated-azimuth signal to be converted to digital orientation
Signal obtains the launch azimuth information of the radiofrequency signal；
Audio A/D conversion modules in described control unit, for the audio signal with orientation to be converted to band side
The digital audio and video signals of position, and the digital audio and video signals with orientation are sent to FPGA module；
FPGA module in described control unit is adopted for being sampled to the digital audio and video signals with orientation
Sample data, and give the sampling data transmitting to DSP signal processing modules；
DSP signal processing modules in described control unit are sampled for carrying out FFT transform to the sampled data
The amplitude-versus-frequency curve of data, judged according to the amplitude-versus-frequency curve of the sampled data be within the scope of preset amplitude threshold
No there are frequency f, and if it exists, then exports the launch azimuth information of the radiofrequency signal, otherwise, exports without effective target signal
Information.
The utility model embodiment also provides a kind of directional audio signal detection method based on FFT, the detection method
Applied to the detection device of above-described embodiment, as shown in figure 3, the directional audio signal detection method includes：Set directional sound
The frequency f of frequency signal；
Radiofrequency signal in directional aerial reception space is modulated the radiofrequency signal to obtain rf modulated signal,
And the rf modulated signal is sent to the receiving unit of finder, the benchmark letter of the rf modulated signal and antenna scanning
There are a phase differences between number；
The receiving unit of finder carries out the rf modulated signal frequency-selecting, frequency conversion, amplification and detection processing successively, obtains
It is sent respectively to control unit and directional aerial to the audio signal with orientation, and by the audio signal with orientation；
The audio signal with orientation is amplified by the directional aerial successively, filters and phase demodulation processing, obtains mould
Intend bearing signal, and the simulated-azimuth signal is sent to the control unit of finder；
The simulated-azimuth signal is converted to digital bearing signal by the control unit of finder, obtains the radiofrequency signal
Launch azimuth information；
The audio signal with orientation is converted to the digital audio and video signals with orientation by the control unit of the finder,
The digital audio and video signals with orientation are sampled to obtain sampled data, and FFT transform is carried out to the sampled data and is obtained
To the amplitude-versus-frequency curve of sampled data, judged in preset amplitude threshold model according to the amplitude-versus-frequency curve of the sampled data
It whether there is frequency f in enclosing, and if it exists, then described control unit exports the launch azimuth information of the radiofrequency signal, otherwise, control
Unit processed exports the information without effective target signal.
Illustratively, software interrupt sampled audio signal, FFT calculate the averaged amplitude value of the frequency values and signal that use,
Spectrum analysis, peak detection.Finally export result.The workflow of directional audio inspection software is as shown in Figure 4.Software is completed just
Beginning chemical industry enters after making successively judges that signal has statelessly.Interruption letter is provided after completing a 512 point datas storage
Number, data are then read, FFT is calculated, spectrum analysis, peak detection.Finally export result.Software calculates output inspection by FFT
It surveys result and continuously takes 30 values, when wherein there is 20 values effective, then judge there is effective audio signal, digital bearing signal is just
Often output；When virtual value is less than 20, then judge that, without effective audio signal, digital bearing signal exports null orientation.Using
Directional audio signal detection method based on fft algorithm, can be intuitive, effectively judges whether there is effective bearing signal,
When effective bearing signal, display orientation signal；Otherwise it shows without effective bearing signal；Simple and clear, objectivity is strong.
Direction finder receives radio incoming wave signal and carries out that orientation is continuously tracked, and is mainly used for receiving hanging down for VHF/UHF frequency ranges
Straight polarized signal, and relevant azimuth information is provided.It forms automatic orientation system together with comprehensive show of aircraft, realizes that helicopter is auxiliary
Help go home, Aircraft Air adds by oily task.It is shown when detecting effective bearing signal, realizes that auxiliary such as is gone home at the tasks.When
When not detecting useful signal, not display orientation signal.
One of ordinary skill in the art will appreciate that：Realize that all or part of step of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in computer read/write memory medium, which exists
When execution, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes：ROM, RAM, magnetic disc or CD
Etc. the various media that can store program code.
Above description is only a specific implementation of the present invention, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation
Or replace, it should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with the power
Subject to the protection domain that profit requires.
Claims (7)
1. a kind of directional audio signal detection device based on FFT, which is characterized in that the directional audio signal detection device packet
It includes：Directional aerial, finder and display；The finder includes：Receiving unit and control unit；
Wherein, the RF output end of the directional aerial is connect with the rf inputs of the receiving unit, the receiving unit
Audio output connect respectively with the audio input end of the audio input end of the directional aerial and control unit, the orientation
The bearing signal output end of antenna and the bearing signal input terminal of described control unit connect, the data output of described control unit
End is connect with the data input pin of display；
Described control unit includes：Sequentially connected three-phase A/D conversion modules, audio A/D conversion modules, FPGA module and DSP
Signal processing module, the signal input parts of the three-phase A/D conversion modules as control unit audio input end with it is described fixed
Connected to the audio input end of antenna, the output ends of the DSP signal processing modules as control unit data output end and
The data input pin of the display connects.
2. a kind of directional audio signal detection device based on FFT according to claim 1, which is characterized in that described three
Phase A/D conversion modules are realized using SDC2904-2112-D chips.
3. a kind of directional audio signal detection device based on FFT according to claim 1, which is characterized in that the sound
Frequency A/D conversion modules are realized using AD9780 chips.
4. a kind of directional audio signal detection device based on FFT according to claim 1, which is characterized in that described
FPGA module is realized using EP3C10F256 chips.
5. a kind of directional audio signal detection device based on FFT according to claim 1, which is characterized in that the DSP
Signal processing module is realized using TMS320VC5509A chips.
6. a kind of directional audio signal detection device based on FFT according to claim 1, which is characterized in that setting is fixed
It is f to the frequency of audio signal；
The directional aerial is modulated the radiofrequency signal to obtain radio-frequency modulations for the radiofrequency signal in reception space
Signal, and the rf modulated signal is sent to the receiving unit of finder, the rf modulated signal and antenna scanning
There are a phase differences between reference signal；
The receiving unit of the finder, for being carried out at frequency-selecting, frequency conversion, amplification and detection successively to the rf modulated signal
Reason, obtains the audio signal with orientation, and the audio signal with orientation is sent respectively to control unit and directional aerial；
The directional aerial is additionally operable to the audio signal with orientation being amplified successively, filter and phase demodulation processing, obtains
Simulated-azimuth signal, and the simulated-azimuth signal is sent to the control unit of finder；
The control unit of the finder obtains described penetrate for the simulated-azimuth signal to be converted to digital bearing signal
The launch azimuth information of frequency signal；
The control unit of the finder is additionally operable to being converted to the audio signal with orientation into the digital audio letter with orientation
Number, the digital audio and video signals with orientation are sampled to obtain sampled data, and FFT transform is carried out to the sampled data
The amplitude-versus-frequency curve of sampled data is obtained, is judged in preset amplitude threshold according to the amplitude-versus-frequency curve of the sampled data
It whether there is frequency f in range, and if it exists, then described control unit exports the launch azimuth information of the radiofrequency signal, otherwise,
Control unit exports the information without effective target signal.
7. a kind of directional audio signal detection device based on FFT according to claim 6, which is characterized in that
Three-phase A/D conversion modules in described control unit, for the simulated-azimuth signal to be converted to digital bearing signal,
Obtain the launch azimuth information of the radiofrequency signal；
Audio A/D conversion modules in described control unit, for being converted to the audio signal with orientation with orientation
Digital audio and video signals, and the digital audio and video signals with orientation are sent to FPGA module；
FPGA module in described control unit, for being sampled to obtain hits to the digital audio and video signals with orientation
According to, and give the sampling data transmitting to DSP signal processing modules；
DSP signal processing modules in described control unit obtain sampled data for carrying out FFT transform to the sampled data
Amplitude-versus-frequency curve, judge whether deposited within the scope of preset amplitude threshold according to the amplitude-versus-frequency curve of the sampled data
In frequency f, and if it exists, then export the launch azimuth information of the radiofrequency signal, otherwise, export the letter without effective target signal
Breath.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107948863A (en) * | 2017-12-29 | 2018-04-20 | 陕西烽火电子股份有限公司 | A kind of directional audio signal detection device and method based on FFT |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107948863A (en) * | 2017-12-29 | 2018-04-20 | 陕西烽火电子股份有限公司 | A kind of directional audio signal detection device and method based on FFT |
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