CN109921863A - Doppler VHF omnirange digitalization surveillance & control system and method - Google Patents
Doppler VHF omnirange digitalization surveillance & control system and method Download PDFInfo
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Abstract
The invention discloses a kind of Doppler VHF omnirange digitalization surveillance & control system and methods, this method are as follows: to radiofrequency signal be filtered and enhanced processing after, AD sampling is carried out to radiofrequency signal according to bandpass sample theory, radiofrequency signal after sampling is converted to intermediate frequency, and is sent to signal processing and control module progress digital demodulation processing.The system includes radio-frequency antenna, bandpass filter, amplifier, PI attenuator, AD sampling module, signal processing and control module and display control module, and the radio-frequency antenna, bandpass filter, amplifier, PI attenuator, AD sampling module, signal processing and control module and display control module are sequentially connected respectively.The present invention reduces the contents of hardware module, greatly enhance the integration degree of circuit, realize the miniaturization of equipment.Due to the reduction of analog device, to reduce the influence because of reasons such as device agings to system function, and the increased maintenance cost because of device aging is reduced.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of Doppler VHF omnirange digitalization surveillance & control systems
And method.
Background technique
DVOR (Doppler VHF Omni Range, doppler vhf omnirange) monitor is to pass through prison
The actual field signal of surveillance is controlled, to ensure that the signal radiated does not have abnormal variation.If detecting incorrect lead
Navigate signal, and monitor is switched to standby transmitter or can in real time close system in no back-up system.It is aerial to obtain electromagnetic field shape
Formula is as follows:
E (t)=Em{DC+mcgm(t)+mAsin(Ωt)+mfcos[Ωs+kf∫sin(Ωt+θ)]}cos(ωt)
Wherein, ΩsFor the mode of 9960Hz frequency modulated subcarrier, reference phase signal and identification code sequence signal AM modulation
It is modulated on the carrier wave that frequencies omega is 108~118MHz, and the modulated signal of 9960Hz frequency modulated subcarrier is Ω variable for 30Hz
Phase signal.
Traditional technology mainly has several parts to realize the monitoring to e (t) signal:
(1) radio-frequency module
Radio-frequency module mainly completes the processing to admission radiofrequency signal, mainly includes rf gain and envelope demodulation two
Part, wherein rf gain is AGC loop, radio-frequency power is amplified to normalization level, envelope demodulation is realized to audio signal
Extraction.
(2) audio-frequency module
Voicefrequency circuit completes the disintegration to each road signal.
(3) digital computation modules
Signal quality is completed using the digital computing circuit or digital integrated electronic circuit of separating component composition to calculate.
Currently, there are two types of the realization of common DVOR monitoring system is general: the first be by radio circuit, voicefrequency circuit,
And the digital computing circuit of old-fashioned separating component composition；Second on the basis of the first, by radio circuit, audio-frequency electric
Road and digital circuit composition, the digital computing circuit for both having formed separating component on the basis of the first is integrated, by counting
Word integrated circuit is completed.
All there are 4 disadvantages in above two DVOR monitoring system.
(1) due to there are the circuits such as complicated analog radio frequency audio, cause monitoring system volume larger, anti-interference ability is not
Foot；
(2) frequency point reception can only be determined, always different platforms will be individually adjusted in use process, versatility is insufficient；
(3) due to excessive analog device, the reasons such as device aging are very big to systematic influence；
(4) the RF index precision that monitoring system is monitored is insufficient.
Summary of the invention
To solve the above-mentioned problems, the present invention has carried out further digitlization improvement on the basis of common DVOR, adopts
With the software and radio technique directly sampled based on radio frequency, audio and radio circuit are all compatible with into digital circuit, and adopted
The work such as frequency conversion, demodulation are solved with the method for igh-speed wire-rod production line, specifically, the invention proposes a kind of Doppler's very high frequency(VHF) is complete
To beacon digital monitoring method, comprising the following steps:
S1. to radiofrequency signal be filtered and enhanced processing after, according to bandpass sample theory to radiofrequency signal carry out AD adopt
Sample, the radiofrequency signal after sampling are converted to intermediate frequency, and are sent to signal processing and control module progress digital demodulation processing；
S2. for the radiofrequency signal after sampling after Digital Down Convert, base band I/Q signal completes AM demodulation by a square summation,
Signal after AM demodulation are as follows:
S3. signal is divided into three tunnels after completing AM demodulation, and the first via extracts the Morse code m of 1020Hzcgm(n), and step is executed
Rapid S4；30Hz reference phase signal m is extracted through 600Hz low-pass filtering in the second tunnelASin (ω n) and DC bias DC, and execute step
Rapid S5；It extracts on third roadFM signal simultaneously does orthogonal FM demodulation, can be covert with extraction
Position 30Hz signal, and execute step S6；
S4. mixing and filtering is carried out to first via signal and obtains Morse code pulse with squared, and known by Morse code
Not to identify Morse code, then by serial port unit Morse code is reported into display control module, and by Signal quality assessment and control
Unit compares Morse code, provides alarm instruction by alerting decision unit if incorrect；
S5. after obtaining 30Hz reference phase signal and direct current DC signal to second road signal progress low-pass filtering, acquisition is slow
32 samples of area's storage 30Hz a cycle are rushed, a cycle sample is mutually calculated by Fast Fourier Transform (FFT) with CORDIC width
Afterwards, DC and 30Hz signal amplitude value and 30Hz signal phase value are obtained, the Amplitude Ratio of DC and 30Hz signal are exactly 30Hz signal
Modulation degree, the phase value that 30Hz signal phase value and FM can be changed 30Hz signal makes the difference to calculate the azimuth of monitoring antenna；
S6. after obtaining variable phase 30Hz signal to the progress FM quadrature demodulation of third road signal, the storage of acquisition buffer area
32 samples of 30Hz a cycle obtain after a cycle sample is mutually calculated by Fast Fourier Transform (FFT) with CORDIC width
The Amplitude Ratio of variable phase 30Hz signal amplitude value and phase value, DC and variable phase 30Hz signal is exactly subcarrier modulation degree,
The phase value of 30Hz signal phase value and variable phase 30Hz signal makes the difference to calculate the azimuth of monitoring antenna.
Preferably, the monitoring that the alarm decision unit is transmitted according to Signal quality assessment and control unit
The control parameter that information and display control module transmit compares, and alarm instruction is just provided more than thresholding.
Preferably, the serial port unit passes the monitoring information that Signal quality assessment and control unit transmit
It is shown to display control module, and the control information that display control module transmits is transmitted to alarm decision unit.
Preferably, in step sl, the sample rate of the AD sampling is 96MSPS.
In addition, the present invention also proposes a kind of Doppler VHF omnirange digitalization surveillance & control system, including radio-frequency antenna,
Bandpass filter, amplifier, PI attenuator, AD sampling module, signal processing and control module and display control module, the radio frequency day
Line, bandpass filter, amplifier, PI attenuator, AD sampling module, signal processing and control module and display control module difference are successively
Connection.
Further, the signal processing and control module include Digital Down Convert unit, AM demodulating unit, first via letter
Number processing unit, second road signal processing unit, third road signal processing unit, phase spread difference computing unit, signal quality are commented
Estimate and control unit, serial port unit and alarm decision unit, the AD sampling module, Digital Down Convert unit and AM demodulating unit
It is sequentially connected respectively, the AM demodulating unit passes through first via signal processing unit, second road signal processing unit and respectively
Three road signal processing units are connect with Signal quality assessment and control unit, the second road signal processing unit and signal quality
Assessment and control unit between and third road signal processing unit with phase is provided between Signal quality assessment and control unit
Spread difference computing unit, the Signal quality assessment and control unit, serial port unit and alarm decision unit homogeneously connect, institute
Serial port unit is stated also to be bi-directionally connected with display control module.
Further, the first via signal processing unit includes frequency mixer, first filter, square summation unit and rubs
This yard of recognition unit of that, the AM demodulating unit, frequency mixer, first filter, square summation unit, Morse code recognition unit
It is sequentially connected respectively with Signal quality assessment and control unit；
Further, the second road signal processing unit includes low-pass filter, second filter, the first acquisition buffer
Area, the first Fast Fourier Transform (FFT) unit and the first CORDIC spectrum amplitude phase computing unit, the AM demodulating unit, low-pass filtering
Device, second filter, the first acquisition buffer area, the first Fast Fourier Transform (FFT) unit, the first CORDIC spectrum amplitude phase computing unit
It is sequentially connected respectively with phase spread difference computing unit；
Further, third road signal processing unit includes FM quadrature demodulation unit, third filter, the second acquisition
Buffer area, the second Fast Fourier Transform (FFT) unit and the 2nd CORDIC spectrum amplitude phase computing unit, the AM demodulating unit, FM are orthogonal
Demodulating unit, third filter, the second acquisition buffer area, the second Fast Fourier Transform (FFT) unit, the 2nd CORDIC spectrum amplitude are mutually counted
It calculates unit and phase spread difference computing unit is sequentially connected respectively.
Preferably, the frequency mixer in the first via signal processing unit is 1020Hz frequency mixer.
Preferably, the first filter in the first via signal processing unit is to have limit for length's unit impulse
Response filter.
Preferably, the low-pass filter in the second road signal processing unit is 600Hz low-pass Finite
Long unit impulse response filter.
Preferably, the second filter and third filter are integral-pectination cascading filter.
The beneficial effects of the present invention are:
(1) content for reducing hardware module greatly enhances the integration degree of circuit, realizes equipment
Miniaturization；
(2) it due to the reduction of analog device, to reduce the influence because of reasons such as device agings to system function, and drops
The low increased maintenance cost because of device aging；
(3) it solves the problems, such as that the precision of conventional monitoring systems is insufficient, improves the precision of system；
(4) reception of full range point may be implemented by software configuration using totally digitilized scheme.
Detailed description of the invention
Fig. 1 is digital monitoring method schematic diagram of the invention；
Fig. 2 is digitalization surveillance & control system structural schematic diagram of the invention；
Fig. 3 is signal processing and control module structural schematic diagram of the invention.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, this hair of Detailed description of the invention is now compareed
Bright specific embodiment.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit
The present invention, i.e., described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually here
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations.Therefore, with
Under the range of claimed invention is not intended to limit to the detailed description of the embodiment of the present invention provided in the accompanying drawings,
But it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not making wound
Every other embodiment obtained under the premise of the property made is worked, shall fall within the protection scope of the present invention.
Embodiment 1
As shown in Figure 1, a kind of Doppler VHF omnirange digital monitoring method, comprising the following steps:
S1. to radiofrequency signal be filtered and enhanced processing after, according to bandpass sample theory to radiofrequency signal carry out AD adopt
Sample, the radiofrequency signal after sampling are converted to intermediate frequency, and are sent to signal processing and control module progress digital demodulation processing；
S2. (Digital Down Convert refers to and passes through in superheterodyne receiver the radiofrequency signal after sampling after Digital Down Convert
Cross a kind of intermediate-freuqncy signal obtained after mixing the mixing schemes lower than the frequency of original signal), base band I/Q signal process square is asked
It is demodulated with AM is completed, the signal after AM demodulation are as follows:
S3. signal is divided into three tunnels after completing AM demodulation, and the first via extracts the Morse code m of 1020Hzcgm(n), and step is executed
Rapid S4；30Hz reference phase signal m is extracted through 600Hz low-pass filtering in the second tunnelASin (ω n) and DC bias DC, and execute step
Rapid S5；It extracts on third roadFM signal simultaneously does orthogonal FM demodulation, can be covert with extraction
Position 30Hz signal, and execute step S6；
S4. mixing and filtering is carried out to first via signal and obtains Morse code pulse with squared, and known by Morse code
Not to identify Morse code, then by serial port unit Morse code is reported into display control module, and by Signal quality assessment and control
Unit compares Morse code, provides alarm instruction by alerting decision unit if incorrect；
S5. after obtaining 30Hz reference phase signal and direct current DC signal to second road signal progress low-pass filtering, acquisition is slow
32 samples of area's storage 30Hz a cycle are rushed, a cycle sample is mutually calculated by Fast Fourier Transform (FFT) with CORDIC width
Afterwards, DC and 30Hz signal amplitude value and 30Hz signal phase value are obtained, the Amplitude Ratio of DC and 30Hz signal are exactly 30Hz signal
Modulation degree, the phase value that 30Hz signal phase value and FM can be changed 30Hz signal makes the difference to calculate the azimuth of monitoring antenna；
S6. after obtaining variable phase 30Hz signal to the progress FM quadrature demodulation of third road signal, the storage of acquisition buffer area
32 samples of 30Hz a cycle obtain after a cycle sample is mutually calculated by Fast Fourier Transform (FFT) with CORDIC width
The Amplitude Ratio of variable phase 30Hz signal amplitude value and phase value, DC and variable phase 30Hz signal is exactly subcarrier modulation degree,
The phase value of 30Hz signal phase value and variable phase 30Hz signal makes the difference to calculate the azimuth of monitoring antenna.
Embodiment 2
The present embodiment is on the basis of embodiment 1:
What the monitoring information and display control module that alarm decision unit is transmitted according to Signal quality assessment and control unit transmitted
Control parameter compares, and alarm instruction is just provided more than thresholding.
Embodiment 3
The present embodiment is on the basis of embodiment 1:
The monitoring information that Signal quality assessment and control unit transmit is passed to display control module and shown by serial port unit, and will
The control information that display control module transmits is transmitted to alarm decision unit.
Embodiment 4
The present embodiment is on the basis of embodiment 1:
In step sl, the sample rate of AD sampling is 96MSPS.
Embodiment 5
The present embodiment provides a kind of Doppler VHF omnirange digitalization surveillance & control systems, as shown in Fig. 2, including radio frequency
Antenna, bandpass filter, amplifier, PI attenuator, AD sampling module, signal processing and control module and display control module, radio frequency
Antenna, bandpass filter, amplifier, PI attenuator, AD sampling module, signal processing and control module and display control module respectively according to
Secondary connection.
As shown in figure 3, signal processing and control module include Digital Down Convert unit, AM demodulating unit, first via signal
Processing unit, second road signal processing unit, third road signal processing unit, phase spread difference computing unit, Signal quality assessment
And control unit, serial port unit and alarm decision unit, AD sampling module, Digital Down Convert unit and AM demodulating unit respectively according to
Secondary connection, AM demodulating unit pass through respectively at first via signal processing unit, second road signal processing unit and third road signal
Reason unit is connect with Signal quality assessment and control unit, second road signal processing unit and Signal quality assessment and control unit
Between and third road signal processing unit be provided between Signal quality assessment and control unit phase spread difference calculate it is single
Member, Signal quality assessment and control unit, serial port unit and alarm decision unit homogeneously connect, serial port unit also with aobvious control mould
Block is bi-directionally connected.
First via signal processing unit includes that frequency mixer, first filter, square summation unit and the identification of Morse code are single
Member, AM demodulating unit, frequency mixer, first filter, square summation unit, Morse code recognition unit and Signal quality assessment and
Control unit is sequentially connected respectively.
Second road signal processing unit includes low-pass filter, second filter, the first acquisition buffer area, first quick Fu
In leaf transformation unit and the first CORDIC spectrum amplitude phase computing unit, AM demodulating unit, low-pass filter, second filter, first
Acquisition buffer area, the first Fast Fourier Transform (FFT) unit, the first CORDIC spectrum amplitude phase computing unit and phase spread difference computing unit
It is sequentially connected respectively.
Third road signal processing unit includes FM quadrature demodulation unit, third filter, the second acquisition buffer area, second fast
Fast Fourier transform unit and the 2nd CORDIC spectrum amplitude phase computing unit, AM demodulating unit, FM quadrature demodulation unit, third filtering
Device, the second acquisition buffer area, the second Fast Fourier Transform (FFT) unit, the 2nd CORDIC spectrum amplitude phase computing unit and phase spread difference meter
Unit is calculated to be sequentially connected respectively.
Embodiment 6
The present embodiment is on the basis of embodiment 5:
Frequency mixer in first via signal processing unit is 1020Hz frequency mixer.
Embodiment 7
The present embodiment is on the basis of embodiment 5:
First filter in first via signal processing unit is to have limit for length's unit impulse response filter, i.e. FIR filtering
Device (FIR, Finite Impulse Response).
Embodiment 8
The present embodiment is on the basis of embodiment 5:
Low-pass filter in second road signal processing unit is the long unit impulse response filter of 600Hz low-pass Finite.
Embodiment 9
The present embodiment is on the basis of embodiment 5:
Second filter and third filter are integral-pectination cascading filter, i.e., cic filter (CIC,
Cascaded integrator–comb filte)。
The above is only a preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can be at this
In the text contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art institute into
Capable modifications and changes do not depart from the spirit and scope of the present invention, then all should be in the protection scope of appended claims of the present invention
It is interior.
In the description of the present invention, it should be noted that term " first ", " second ", " third " etc. are only used for distinguishing and retouch
It states, is not understood to indicate or imply relative importance.It should also be noted that, unless otherwise clearly defined and limited,
Term " setting ", " installation ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection,
Or it is integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be wired connection, be also possible to be wirelessly connected.
Claims (9)
1. a kind of Doppler VHF omnirange digital monitoring method, which comprises the following steps:
S1. to radiofrequency signal be filtered and enhanced processing after, according to bandpass sample theory to radiofrequency signal carry out AD sampling, adopt
Radiofrequency signal after sample is converted to intermediate frequency, and is sent to signal processing and control module progress digital demodulation processing；
S2. for the radiofrequency signal after sampling after Digital Down Convert, base band I/Q signal completes AM demodulation, AM solution by a square summation
Signal after tune are as follows:
S3. signal is divided into three tunnels after completing AM demodulation, and the first via extracts the Morse code m of 1020Hzcgm(n), and step is executed
S4；30Hz reference phase signal m is extracted through 600Hz low-pass filtering in the second tunnelASin (ω n) and DC bias DC, and execute step
S5；It extracts on third roadFM signal simultaneously does orthogonal FM demodulation, to extract variable phase
30Hz signal, and execute step S6；
S4. to first via signal carry out mixing and filtering and it is squared obtain Morse code pulse, and by Morse code identify come
It identifies Morse code, then Morse code is reported into display control module by serial port unit, and by Signal quality assessment and control unit
Morse code is compared, provides alarm instruction by alerting decision unit if incorrect；
S5. after obtaining 30Hz reference phase signal and direct current DC signal to second road signal progress low-pass filtering, acquisition buffer area
32 samples of 30Hz a cycle are stored, after a cycle sample is mutually calculated by Fast Fourier Transform (FFT) with CORDIC width,
Obtain DC and 30Hz signal amplitude value and 30Hz signal phase value, the Amplitude Ratio of DC and 30Hz signal is exactly the tune of 30Hz signal
The phase value that system, 30Hz signal phase value and FM can be changed 30Hz signal makes the difference to calculate the azimuth of monitoring antenna；
S6. after obtaining variable phase 30Hz signal to the progress FM quadrature demodulation of third road signal, acquisition buffer area stores 30Hz mono-
32 samples in a period, after a cycle sample is mutually calculated by Fast Fourier Transform (FFT) with CORDIC width, obtaining can be covert
The Amplitude Ratio of position 30Hz signal amplitude value and phase value, DC and variable phase 30Hz signal is exactly subcarrier modulation degree, 30Hz letter
The phase value of number phase value and variable phase 30Hz signal makes the difference to calculate the azimuth of monitoring antenna.
2. a kind of Doppler VHF omnirange digital monitoring method according to claim 1, which is characterized in that institute
State the monitoring information that alarm decision unit is transmitted according to Signal quality assessment and control unit and the control ginseng that display control module transmits
Number compares, and alarm instruction is just provided more than thresholding.
3. a kind of Doppler VHF omnirange digital monitoring method according to claim 1, which is characterized in that institute
It states serial port unit the monitoring information that Signal quality assessment and control unit transmit is passed into display control module and show, and by aobvious control mould
The control information that block transmits is transmitted to alarm decision unit.
4. a kind of Doppler VHF omnirange digital monitoring method according to claim 1, which is characterized in that
In step S1, the sample rate of the AD sampling is 96MSPS.
5. a kind of Doppler VHF omnirange digitalization surveillance & control system, which is characterized in that including radio-frequency antenna, bandpass filtering
Device, amplifier, PI attenuator, AD sampling module, signal processing and control module and display control module, the radio-frequency antenna, band logical
Filter, amplifier, PI attenuator, AD sampling module, signal processing and control module and display control module are sequentially connected respectively；
The signal processing and control module include Digital Down Convert unit, AM demodulating unit, first via signal processing unit,
Two road signal processing units, third road signal processing unit, phase spread difference computing unit, Signal quality assessment and control unit,
Serial port unit and alarm decision unit, the AD sampling module, Digital Down Convert unit and AM demodulating unit are sequentially connected respectively,
The AM demodulating unit passes through first via signal processing unit, second road signal processing unit and third road signal processing list respectively
Member is connect with Signal quality assessment and control unit, the second road signal processing unit and Signal quality assessment and control unit
Between and third road signal processing unit be provided between Signal quality assessment and control unit phase spread difference calculate it is single
Member, the Signal quality assessment and control unit, serial port unit and alarm decision unit homogeneously connect, and the serial port unit is also
It is bi-directionally connected with display control module；
The first via signal processing unit includes that frequency mixer, first filter, square summation unit and the identification of Morse code are single
Member, the AM demodulating unit, frequency mixer, first filter, square summation unit, Morse code recognition unit and signal quality are commented
Estimate and control unit is sequentially connected respectively；
The second road signal processing unit includes low-pass filter, second filter, the first acquisition buffer area, first quick Fu
In leaf transformation unit and the first CORDIC spectrum amplitude phase computing unit, the AM demodulating unit, low-pass filter, second filter,
First acquisition buffer area, the first Fast Fourier Transform (FFT) unit and the first CORDIC spectrum amplitude phase computing unit and phase spread difference calculate
Unit is sequentially connected respectively；
Third road signal processing unit includes FM quadrature demodulation unit, third filter, the second acquisition buffer area, second fast
Fast Fourier transform unit and the 2nd CORDIC spectrum amplitude phase computing unit, the AM demodulating unit, FM quadrature demodulation unit, third
Filter, the second acquisition buffer area, the second Fast Fourier Transform (FFT) unit, the 2nd CORDIC spectrum amplitude phase computing unit and phase spread
Poor computing unit is sequentially connected respectively.
6. a kind of Doppler VHF omnirange digitalization surveillance & control system according to claim 5, which is characterized in that institute
Stating the frequency mixer in first via signal processing unit is 1020Hz frequency mixer.
7. a kind of Doppler VHF omnirange digitalization surveillance & control system according to claim 5, which is characterized in that institute
Stating the first filter in first via signal processing unit is to have limit for length's unit impulse response filter.
8. a kind of Doppler VHF omnirange digitalization surveillance & control system according to claim 5, which is characterized in that institute
Stating the low-pass filter in second road signal processing unit is the long unit impulse response filter of 600Hz low-pass Finite.
9. a kind of Doppler VHF omnirange digitalization surveillance & control system according to claim 5, which is characterized in that institute
It states second filter and third filter is integral-pectination cascading filter.
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| CN113067684A (en) * | 2021-03-18 | 2021-07-02 | 四川九洲空管科技有限责任公司 | Transmitter dual-machine switching system and method of Doppler very high frequency omnidirectional beacon |
| CN113067684B (en) * | 2021-03-18 | 2022-06-24 | 四川九洲空管科技有限责任公司 | Transmitter dual-machine switching system and method of Doppler very high frequency omnidirectional beacon |
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Application publication date: 20190621 |