CN107907891A - Null tone anti-interference method and application system in satellite navigation application system - Google Patents
Null tone anti-interference method and application system in satellite navigation application system Download PDFInfo
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- CN107907891A CN107907891A CN201711134806.XA CN201711134806A CN107907891A CN 107907891 A CN107907891 A CN 107907891A CN 201711134806 A CN201711134806 A CN 201711134806A CN 107907891 A CN107907891 A CN 107907891A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
Abstract
The present invention relates to null tone anti-interference method and application system in a kind of satellite navigation application system, by after each frequency point anti-interference filtration processing module, before inverse Fourier transform module, increase narrow-band filtering module, can solve the problems, such as to resist more arrowband interference not filter out present in current null tone Anti-interference algorithm；The whole process of the present invention, which can be integrated in FPGA, to be realized, is conducive to the Miniaturization Design of device；The method of the present invention is suitable for the satellite navigation of the military domains such as guided missile, bomb, aircraft, naval vessel, has stronger practicality.
Description
Technical field
The present invention relates to null tone anti-interference method and application system in a kind of satellite navigation application system, belong to satellite navigation
Technical field.
Background technology
Satellite technology plays an increasingly important role in the modern life, but due to satellite navigation signals extremely it is faint (-
130dBm), equipment is highly susceptible to various natural or artificial interference and can not work, and therefore, it is necessary to introduce array antenna
Anti-Jamming Technique improves the antijamming capability of satellite navigation system.
There are arrowband, broadband, frequency sweep and pulse signal, the interference number shape to disturb and disturb more in the presence of single-trunk for interference type
Formula, for the performance for improving anti-broadband interference and disturbing more, typically take during sky/frequency-domain combined mode filtered
Ripple, common algorithm combine Anti-interference algorithm and combine Anti-interference algorithm with null tone at one's leisure, due to space-time joint Anti-interference algorithm
Calculation amount is larger, implements difficulty in Practical Project, therefore in practice most are null tone joint Anti-interference algorithms.
The null tone adaptive navigation mentioned in document " a kind of null tone self-adaptive processing algorithm for suppressing GPS radio frequency interference " resists
Algorithm of interference, because in the case where that can receive hardware resource, greatly improves the time free degree, can improve anti-broadband interference with
And the ability disturbed more has been widely used.Common null tone Anti-interference algorithm generally through over-sampling/caching, adding window at
Reason, DFT, each frequency point anti-interference filtration processing, IDFT plus anti-window handle six big steps, but this method can deposit in practice
To more arrowbands interference can not filter out the problem of.
The content of the invention
The technical problems to be solved by the invention, which are to provide one kind and can effectively eliminate anti-more arrowbands interference and can not filter out, asks
Null tone anti-interference method in the satellite navigation application system of topic.
In order to solve the above-mentioned technical problem the present invention uses following technical scheme：The present invention devises a kind of satellite navigation should
With null tone anti-interference method in system, for for by array antenna received, and the analog intermediate frequency signal exported through radio-frequency module
Realize null tone anti-interference process；Include the following steps：
Step A. is sampled for analog intermediate frequency signal, and through processing obtain correspond to respectively each communication port and that
The identical each channel digital signal data of this data length；
Step B. is directed to each channel digital signal data respectively, based on the data length of channel digital signal data, pin
Windowing process is carried out to each data in channel digital signal data, updates each channel digital signal data；
Step C. is respectively for each channel digital signal data after windowing process updates, for channel digital signal
Each window data in data carries out Fourier transform operation, updates each channel digital signal data；
Step D. is respectively for each channel digital signal data after operation processing updates are fourier transformed, for logical
Each frequency point data in road digital signal data carries out frequency point anti-interference filtration processing, updates each channel digital signal data；
Step E. is directed to each channel digital signal data after the processing renewal of frequency point anti-interference filtration respectively, based on narrow
Band filtering threshold, narrow-band filtering processing renewal is carried out for each frequency point data in channel digital signal data, and then is updated each
A channel digital signal data；
Step F. is directed to each channel digital signal data after narrow-band filtering processing renewal respectively, for channel number word
Each window data in signal data carries out inverse Fourier transform operation, updates each channel digital signal data；
Step G. is directed to each channel digital signal data after inverse Fourier transform operates processing renewal respectively, for
Each window data in channel digital signal data carries out plus the processing of anti-window, updates each channel digital signal data.
As a preferred technical solution of the present invention：In the step A, carry out modulus for analog intermediate frequency signal and adopt
Sample.
As a preferred technical solution of the present invention：In the step A, after being sampled for analog intermediate frequency signal,
Handle to obtain through digital quadrature difference and correspond to each communication port and each other identical each channel number word letter of data length respectively
Number.
As a preferred technical solution of the present invention：In the step E, it is directed to is handled through frequency point anti-interference filtration respectively
Each channel digital signal data after renewal, for each frequency point data in channel digital signal data, obtain each first
A frequency point data square the sum ofN=1 ..., N, N represent data length in the channel digital signal data, y
(n) n-th of frequency point data in the channel digital signal data is represented；The data length being then based in the channel digital signal data
N is spent, is calculatedAs a result, as the narrow-band filtering threshold value M corresponding to the channel digital signal data, and then obtain respectively
The corresponding narrow-band filtering threshold value M of each channel digital signal data difference after the processing renewal of frequency point anti-interference filtration.
As a preferred technical solution of the present invention：In the step E, it is directed to is handled through frequency point anti-interference filtration respectively
Each channel digital signal data after renewal, for each frequency point data y (n) in channel digital signal data, based on this
Narrow-band filtering threshold value M corresponding to channel digital signal data, if y2(n) it is more than M, then carries out zero-setting operation for y (n)；If y2
(n) it is not more than M, is not then operated for y (n), in this way, carries out arrowband for each frequency point data in the channel digital signal data
Filtering process updates, and then updates each channel digital signal data.
Null tone anti-interference method in a kind of satellite navigation application system of the present invention, using above technical scheme with it is existing
Technology is compared, and has following technique effect：Null tone anti-interference method in a kind of satellite navigation application system that the present invention designs, leads to
The step of being directed to the increase narrow-band filtering of the data after anti-interference filtration is crossed, can solve to be deposited in current null tone Anti-interference algorithm
Anti- more arrowbands interference can not filter out the problem of；And the whole process designed by the present invention can be integrated in FPGA real
It is existing, be conducive to the Miniaturization Design of device；The method of the present invention is suitable for the satellite of the military domains such as guided missile, bomb, aircraft, naval vessel
Navigation equipment, has stronger practicality.
With above-mentioned corresponding, the present invention also technical problems to be solved are to provide null tone in a kind of satellite navigation application system
The application system of anti-interference method, can effectively eliminate anti-more arrowband interference can not filter out problem.
In order to solve the above-mentioned technical problem the present invention uses following technical scheme：The present invention devises a kind of satellite navigation should
With the application system of null tone anti-interference method in system, for for by array antenna received, and exported through radio-frequency module
Frequency analog signal realizes null tone anti-interference process；Including sampling processing module, windowing processing module, fourier transformation module, each
Frequency point anti-interference filtration processing module, narrow-band filtering module, inverse Fourier transform module and plus anti-window processing module；
Wherein, sampling processing module is used to be sampled for analog intermediate frequency signal, and obtains and corresponded to respectively respectively through processing
The identical each channel digital signal data of a communication port and each other data length；
Windowing processing module is used to be directed to each channel digital signal data, the number based on channel digital signal data respectively
According to length, windowing process is carried out for each data in channel digital signal data, updates each channel digital signal data；
Fourier transformation module is used to be directed to each channel digital signal after windowing processing module processing renewal respectively
Data, carry out Fourier transform operation for each window data in channel digital signal data, update each channel number word
Signal data；
Each frequency point anti-interference filtration processing module is used for each after resume module updates for being fourier transformed respectively
Channel digital signal data, carry out frequency point anti-interference filtration processing, more for each frequency point data in channel digital signal data
New each channel digital signal data；
Narrow-band filtering module, narrow-band filtering module is used to be directed to respectively to be handled more through each frequency point anti-interference filtration processing module
Each channel digital signal data after new, based on narrow-band filtering threshold value, for each frequency point number in channel digital signal data
Updated according to narrow-band filtering processing is carried out, and then update each channel digital signal data；
Inverse Fourier transform module is used to be directed to each channel number word letter after the renewal of narrow-band filtering resume module respectively
Number, carries out inverse Fourier transform operation for each window data in channel digital signal data, updates each passage
Digital signal data；
Anti- window processing module is added to be used to be directed to each channel number word after the renewal of inverse Fourier transform resume module respectively
Signal data, carries out for each window data in channel digital signal data plus anti-window is handled, and updates each channel number word
Signal data.
As a preferred technical solution of the present invention：The sampling processing module includes modulus sampling module, for
Analog intermediate frequency signal, is sampled using modulus sampling module.
As a preferred technical solution of the present invention：The processing of digital quadrature difference is further included in the sampling processing module
Module, after being sampled for frequency analog signal, carries out processing using digital quadrature difference processing module and is corresponded to respectively
The identical each channel digital signal data of each communication port and each other data length.
The application system of null tone anti-interference method in a kind of satellite navigation application system of the present invention, using above technology
Scheme compared with prior art, has following technique effect：Null tone resists in a kind of satellite navigation application system that the present invention designs
The application system of interference method, by after each frequency point anti-interference filtration processing module, before inverse Fourier transform module, increasing
Add narrow-band filtering module, can solve the problems, such as to resist more arrowband interference not filter out present in current null tone Anti-interference algorithm；
The whole process of the present invention, which can be integrated in FPGA, to be realized, is conducive to the Miniaturization Design of device；The method of the present invention is suitable for
The satellite navigation of the military domains such as guided missile, bomb, aircraft, naval vessel, has stronger practicality.
Brief description of the drawings
Fig. 1 is existing null tone Anti-interference algorithm block diagram；
Fig. 2 is the schematic diagram of null tone anti-interference method in present invention design satellite navigation application system；
Fig. 3 is narrow-band filtering threshold calculations schematic diagram under noiseless situation in present invention design；
Fig. 4 is the flow diagram of step E to step G in present invention design；
Fig. 5 is spectrogram after the filtering of existing null tone Anti-interference algorithm；
Fig. 6 schemes to be captured after the filtering of existing null tone Anti-interference algorithm；
Fig. 7 is spectrogram after the null tone Anti-interference algorithm of the present invention filters；
Fig. 8 is to capture figure after the null tone Anti-interference algorithm of the present invention filters.
Embodiment
The embodiment of the present invention is described in further detail with reference to Figure of description.
As shown in Figure 1, giving existing null tone Anti-interference algorithm block diagram, null tone anti-interference process algorithm is in radio-frequency front-end
Afterwards, the signal that array antenna received arrives exports analog intermediate frequency signal by radio-frequency module, samples to obtain digital signal by AD,
Then the processing of Anti-interference algorithm is carried out, carries out anti-interference process.Wherein mainly include sampling/caching, windowing process, DFT, each
The processing of frequency point anti-interference filtration, IDFT plus anti-window handle six big steps, but do not have between the processing of each frequency point anti-interference filtration and IDFT
There is the step of narrow-band filtering.
As shown in Fig. 2, the present invention devises null tone anti-interference method and application system in a kind of satellite navigation application system,
For realizing null tone anti-interference process for the analog intermediate frequency signal by array antenna received, and through radio-frequency module output；In reality
Among the application of border, it is anti-interference that application system includes sampling processing module, windowing processing module, fourier transformation module, each frequency point
Filtering process module, narrow-band filtering module, inverse Fourier transform module and plus anti-window processing module；In specific implementation process, bag
Include following steps：
Step A. is sampled by sampling processing module for analog intermediate frequency signal, and is obtained and corresponded to respectively respectively through processing
The identical each channel digital signal data of a communication port and each other data length；Wherein, sampling processing module includes modulus
Sampling module and digital difference in orthogonality value processing module, for analog intermediate frequency signal, are sampled using modulus sampling module, and
After sampling, processing acquisition is carried out using digital quadrature difference processing module and corresponds to each communication port and each other data length respectively
Spend identical each channel digital signal data.
Step B. is directed to each channel digital signal data respectively by windowing processing module, based on channel digital signal data
Data length, in channel digital signal data each data carry out windowing process, update each channel digital signal
Data.
Step C. is directed to each channel number word after windowing processing module processing renewal by fourier transformation module respectively
Signal data, carries out Fourier transform operation for each window data in channel digital signal data, updates each passage
Digital signal data.
Step D. by each frequency point anti-interference filtration processing module respectively for be fourier transformed resume module renewal after
Each channel digital signal data, each frequency point data in channel digital signal data are carried out at frequency point anti-interference filtration
Reason, updates each channel digital signal data.
Step E. is directed to each after the processing renewal of each frequency point anti-interference filtration processing module respectively by narrow-band filtering module
A channel digital signal data, based on narrow-band filtering threshold value, carry out narrow for each frequency point data in channel digital signal data
Band filtering process updates, and then updates each channel digital signal data.
In above-mentioned steps E, as shown in figure 3, being directed to each port number after the processing renewal of frequency point anti-interference filtration respectively
Word signal data, for each frequency point data in channel digital signal data, obtain first each frequency point data square it
WithN=1 ..., N, N represent data length in the channel digital signal data, y (n) represents that the channel number word is believed
N-th of frequency point data in number；The data length N being next based in the channel digital signal data, calculatesKnot
Fruit, as the narrow-band filtering threshold value M corresponding to the channel digital signal data；Then, as shown in figure 4, being directed to the channel number word
Each frequency point data y (n) in signal data, based on the narrow-band filtering threshold value M corresponding to the channel digital signal data, if y2
(n) it is more than M, then carries out zero-setting operation for y (n)；If y2(n) it is not more than M, is not then operated for y (n), in this way, logical for this
Each frequency point data in road digital signal data carries out narrow-band filtering processing renewal, and then updates each channel digital signal number
According to.
Step F. is directed to each port number after the renewal of narrow-band filtering resume module by inverse Fourier transform module respectively
Word signal data, carries out inverse Fourier transform operation, renewal is each for each window data in channel digital signal data
Channel digital signal data.
Step G. is each after inverse Fourier transform module operates processing renewal by adding anti-window processing module to be directed to respectively
Channel digital signal data, carry out for each window data in channel digital signal data plus anti-window is handled, and renewal is each
Channel digital signal data.
By null tone anti-interference method and application system in a kind of satellite navigation application system designed by the present invention, tool is applied to
Among the actual conditions of body, as shown in figure 5, giving existing null tone Anti-interference algorithm to the frequency spectrum after more arrowband interference filters
Scheme, this it appears that the arrowband interference at center frequency point is not filtered out in figure, anti-jamming effectiveness is poor；As shown in fig. 6, provide
To the acquiring satellite figure after more arrowband interference filters, it can be seen from the figure that satellite is at large to be obtained into existing null tone Anti-interference algorithm
Work(；As shown in fig. 7, null tone Anti-interference algorithm of the present invention is given to the spectrogram after more arrowband interference filters, can be bright in figure
It is aobvious to find out at center frequency point there is obvious depression, illustrate to have carried out zero-setting operation for the point more than threshold value, interference is carried out
Filter out；As shown in figure 8, null tone Anti-interference algorithm of the present invention is given to the acquiring satellite figure after more arrowband interference filters, in figure
It can be seen that acquiring satellite success.
Null tone anti-interference method and application system in a kind of satellite navigation application system that the present invention designs, by each frequency
After point anti-interference filtration processing module, before inverse Fourier transform module, increase narrow-band filtering module, current sky can be solved
The problem of resisting more arrowband interference not filter out present in frequency Anti-interference algorithm；The whole process of the present invention can be integrated in FPGA
Middle realization, is conducive to the Miniaturization Design of device；The method of the present invention is suitable for the military domains such as guided missile, bomb, aircraft, naval vessel
Satellite navigation, has stronger practicality.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementation
Mode, within the knowledge of a person skilled in the art, can also be on the premise of present inventive concept not be departed from
Make various variations.
Claims (8)
1. null tone anti-interference method in a kind of satellite navigation application system, for for by array antenna received, and through radio frequency mould
The analog intermediate frequency signal of block output realizes null tone anti-interference process；It is characterised in that it includes following steps：
Step A. is sampled for analog intermediate frequency signal, and is obtained through processing and corresponded to each communication port respectively and count each other
According to the identical each channel digital signal data of length；
Step B. is directed to each channel digital signal data respectively, based on the data length of channel digital signal data, for logical
Each data in road digital signal data carry out windowing process, update each channel digital signal data；
Step C. is respectively for each channel digital signal data after windowing process updates, for channel digital signal data
In each window data carry out Fourier transform operation, update each channel digital signal data；
Step D. is respectively for each channel digital signal data after operation processing updates are fourier transformed, for port number
Each frequency point data in word signal data carries out frequency point anti-interference filtration processing, updates each channel digital signal data；
Step E. is directed to each channel digital signal data after the processing renewal of frequency point anti-interference filtration respectively, is filtered based on arrowband
Ripple threshold value, narrow-band filtering processing renewal is carried out for each frequency point data in channel digital signal data, and then is updated each logical
Road digital signal data；
Step F. is directed to each channel digital signal data after narrow-band filtering processing renewal respectively, for channel digital signal
Each window data in data carries out inverse Fourier transform operation, updates each channel digital signal data；
Step G. is directed to each channel digital signal data after inverse Fourier transform operates processing renewal respectively, for passage
Each window data in digital signal data carries out plus the processing of anti-window, updates each channel digital signal data.
2. null tone anti-interference method in satellite navigation application system according to claim 1, it is characterised in that
In the step A, modulus sampling is carried out for analog intermediate frequency signal.
3. null tone anti-interference method in satellite navigation application system according to claim 2, it is characterised in that
In the step A, after being sampled for analog intermediate frequency signal, corresponded to respectively through the processing acquisition of digital quadrature difference each
The identical each channel digital signal data of communication port and each other data length.
4. null tone anti-interference method in satellite navigation application system according to claim 1, it is characterised in that
In the step E, it is directed to handles each channel digital signal data after updating through frequency point anti-interference filtration respectively, for
Each frequency point data in channel digital signal data, obtain first each frequency point data square the sum ofN represents the data length in the channel digital signal data, and y (n) represents that the channel number word is believed
N-th of frequency point data in number；The data length N being then based in the channel digital signal data, calculatesKnot
Fruit, as the narrow-band filtering threshold value M corresponding to the channel digital signal data, and then obtains through at frequency point anti-interference filtration respectively
The corresponding narrow-band filtering threshold value M of each channel digital signal data difference after reason renewal.
5. null tone anti-interference method in satellite navigation application system according to claim 4, it is characterised in that：The step
In E, it is directed to handles each channel digital signal data after updating through frequency point anti-interference filtration respectively, for channel digital signal
Each frequency point data y (n) in data, based on the narrow-band filtering threshold value M corresponding to the channel digital signal data, if y2(n)
More than M, then zero-setting operation is carried out for y (n)；If y2(n) it is not more than M, is not then operated for y (n), in this way, is directed to the passage
Each frequency point data in digital signal data carries out narrow-band filtering processing renewal, and then updates each channel digital signal data.
6. a kind of application system based on null tone anti-interference method in satellite navigation application system according to claim 3,
For realizing null tone anti-interference process for the analog intermediate frequency signal by array antenna received, and through radio-frequency module output；Including
Sampling processing module, windowing processing module, fourier transformation module, each frequency point anti-interference filtration processing module, inverse Fourier become
Change the mold block and plus anti-window processing module；
Wherein, sampling processing module is used to be sampled for analog intermediate frequency signal, and is obtained through processing and correspond to each lead to respectively
Believe passage and each other identical each channel digital signal data of data length；
Windowing processing module is used to be directed to each channel digital signal data respectively, the data length based on channel digital signal data
Degree, carries out windowing process for each data in channel digital signal data, updates each channel digital signal data；
Fourier transformation module is used to be directed to each channel digital signal data after windowing processing module processing renewal respectively,
Fourier transform operation is carried out for each window data in channel digital signal data, updates each channel digital signal number
According to；
Each frequency point anti-interference filtration processing module is used to be directed to each passage after being fourier transformed resume module renewal respectively
Digital signal data, carries out frequency point anti-interference filtration processing, renewal is each for each frequency point data in channel digital signal data
A channel digital signal data；It is characterized in that,
Narrow-band filtering module is further included, narrow-band filtering module is used to be directed to respectively to be handled through each frequency point anti-interference filtration processing module
Each channel digital signal data after renewal, based on narrow-band filtering threshold value, for each frequency point in channel digital signal data
Data carry out narrow-band filtering processing renewal, and then update each channel digital signal data；
Inverse Fourier transform module is used to be directed to each channel digital signal number after the renewal of narrow-band filtering resume module respectively
According to, in channel digital signal data each window data carry out inverse Fourier transform operation, update each channel number word
Signal data；
Anti- window processing module is added to be used to be directed to each channel digital signal after the renewal of inverse Fourier transform resume module respectively
Data, carry out for each window data in channel digital signal data plus anti-window is handled, and update each channel digital signal
Data.
7. the application system of null tone anti-interference method, its feature exist in satellite navigation application system according to claim 6
In：The sampling processing module includes modulus sampling module, for analog intermediate frequency signal, is adopted using modulus sampling module
Sample.
8. the application system of null tone anti-interference method, its feature in the satellite navigation application system according to claim 6 or 7
It is：Digital quadrature difference processing module is further included in the sampling processing module, after being sampled for frequency analog signal,
Processing is carried out using digital quadrature difference processing module and obtains to correspond to each communication port respectively and data length is identical each other
Each channel digital signal data.
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