CN105549035B - A kind of baseband signal frequency domain narrowband Interference Detection cancellation element and method - Google Patents
A kind of baseband signal frequency domain narrowband Interference Detection cancellation element and method Download PDFInfo
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- CN105549035B CN105549035B CN201510975108.7A CN201510975108A CN105549035B CN 105549035 B CN105549035 B CN 105549035B CN 201510975108 A CN201510975108 A CN 201510975108A CN 105549035 B CN105549035 B CN 105549035B
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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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Abstract
The invention discloses a kind of baseband signal frequency domain narrowband Interference Detection cancellation element and method, wherein, the described method includes：Intermediate-freuqncy signal is divided into two-way, it is exported respectively to narrowband interference detectors and narrow-band interference canceller, the narrowband interference detectors carry out Interference Detection to the intermediate-freuqncy signal all the way of reception, obtain Interference Detection information, and the narrow-band interference canceller is sent it to, the another way intermediate-freuqncy signal that the narrow-band interference canceller is received according to the Interference Detection information butt joint carries out narrow-band interference excision processing.Narrowband interference detectors provided by the invention can not only detect whether that there are narrowband interference, the index information of interference frequency point can also be provided, so that narrow-band interference canceller only carries out frequency domain filtering to there is the frequency point of interference, the present invention not only has good Suppression of narrow band interference effect, system power dissipation can also be reduced, there is stronger practicability.
Description
Technical field
The present invention relates to satellite navigation digital signal processing technique fields, and in particular to does a kind of baseband signal frequency domain narrowband
Disturb detection cancellation element and method.
Background technology
CDMA (Code Division Multiple Access, CDMA) signal is as pseudo-random signal, power spectrum
Entire baseband bandwidth is diffused to, removing narrowband interference (Narrow Band Interference) only can be such that CDMA signals are subject to gently
Micro-damage.So CDMA signals have certain anti-narrowband jamming performance, such as Global Navigation Satellite System (Global
Navigation Satellite System, GNSS) signal itself can resist the interference of 30dB jamming-to-signal ratios, but for stronger
Narrowband interference just need to can be correctly processed GNSS signal by targetedly antijamming measure.
Narrowband strong jamming is common interference in practical applications, it is inhibited to complete in a time domain or in a frequency domain.When
Domain method utilizes the correlation of narrowband interference, carries out lowest mean square (Least Mean Squares, LMS) algorithm or recursion most
Small two multiply (Recursive Least Squares, RLS) algorithm adaptive-filtering, and there are hardware realization complexities for time-domain filtering
The shortcomings of high, convergence time is slowly and group delay changes；Frequency domain method then passes through Fast Fourier Transform (Fast Fourier
Transformation, FFT) or fast fourier inverse transformation (Inverse Fast Fourier Transformation,
IFFT), frequency point zero setting residing for interference is disturbed with eliminating.Wherein frequency domain algorithm is due to that can utilize FFT/IFFT fast algorithms to subtract
Few calculation amount, and can guarantee the linear phase of Interference Suppression System, thus be widely applied.
Frequency domain filtering common at present mainly has following two modes：
First way, the simply interference mitigation technology based on FFT/IFFT count data by windowing process, FFT
It calculates, exported after NBI filtering process and IFFT calculating, although this method can remove narrowband interference, windowing process is reducing
Spectrum leakage during FFT avoids interference from existing and input signal is caused to distort while diffuse to other frequency points, causes to export signal
Signal-to-noise ratio the shortcomings that incurring loss.
The second way, for reduce adding window caused by snr loss, based on superposition Fast Fourier Transform (OFFT,
Over lapped Fast Fourier Transform) interference mitigation technology be suggested.Basic thought is will to input number
According to replicating and shifting adding window, two windowed datas are obtained together with former windowed data, FFT transform is carried out, and is filtered in frequency domain
Ripple, carries out IFFT and obtains the time domain data of removal interference after filtering, finally merge two paths of data alignment and obtain final output.It should
Deficiency mainly has the following existing for method：First, not necessarily there is always but interference eliminator works always, increases for interference
Add unnecessary system power dissipation；Second is that the length of FFT/IFFT is fixed, it is limited for narrowband interference detection sensitivity；Third, window
Function is fixed, and is unfavorable for filtering out for big dynamic range interference；Fourth, in existing OFFT disturbance restraining methods delayed data side
Method be usually before adding window increase a delayed data module, for that input data will cache all the way, so as to it is another
Initial data exports carry out windowing process together all the way, and after frequency domain filtering, equally it is being also required to increase a delayed data
Module that circuit-switched data not postponed is postponed so that itself and carried out before delay that way
According to can align, with carry out it is subsequent merge export, there are resource overhead is big and the problem of design complexities are high for this method.
The content of the invention
The technical problems to be solved by the invention be to provide a kind of baseband signal frequency domain narrowband Interference Detection cancellation element and
Method carries out Interference Detection to the signal all the way of input by interference detector and obtains Interference Detection information, and outputs it to
Narrow-band interference canceller, the narrow-band interference canceller carry out the another way signal of input according to the Interference Detection information narrow
Band AF panel solves that system power dissipation in the prior art is big, detectivity is limited, window function is fixed and design to answer
It is miscellaneous to spend the problem of high.
The technical solution that the present invention solves above-mentioned technical problem is as follows：
On the one hand, the present invention provides a kind of baseband signal frequency domain narrowband Interference Detection cancellation element, described device includes
Narrowband interference detectors and narrow-band interference canceller；
The narrowband interference detectors for carrying out Interference Detection to the another way intermediate-freuqncy signal of reception, obtain interference inspection
Measurement information, and the narrow-band interference canceller is sent it to, the Interference Detection information specifically includes interference indicator information, does
Scrambling point index information and window function index information；
The narrow-band interference canceller, the intermediate-freuqncy signal all the way for being received according to the Interference Detection information butt joint carry out narrow
Band interference elimination treatment, if the interference indicator information shows the intermediate-freuqncy signal there is no narrowband interference, the narrowband is done
Static condenser carries out the intermediate-freuqncy signal bypass delay disposal and outputs it；If in the presence of according to the interference frequency point rope
Fuse ceases and window function index information carries out the intermediate-freuqncy signal narrow-band interference excision processing and outputs it.
On the other hand, the present invention provides a kind of baseband signal frequency domain narrowband Interference Detection removing method, the method bags
It includes：
Intermediate-freuqncy signal is divided into two-way, to narrowband interference detectors, another way is exported to be disturbed signal output to narrowband all the way
Arrester；
The narrowband interference detectors carry out Interference Detection to the intermediate-freuqncy signal all the way of reception, obtain Interference Detection information,
And the narrow-band interference canceller is sent it to, the Interference Detection information specifically includes interference indicator information, interference frequency point
Index information and window function index information；
The another way intermediate-freuqncy signal that the narrow-band interference canceller is received according to the Interference Detection information butt joint carries out narrowband
Interference elimination treatment, if the interference indicator information shows the intermediate-freuqncy signal, there is no narrowband interference, the narrowband interference
Arrester carries out the intermediate-freuqncy signal bypass delay disposal and outputs it；If in the presence of according to the interference frequency point index
Information and window function index information carry out the intermediate-freuqncy signal narrow-band interference excision processing and output it.
The present invention provides a kind of baseband signal frequency domain narrowband Interference Detection cancellation element and methods, and intermediate-freuqncy signal is divided into
Two-way is exported respectively to narrowband interference detectors and narrow-band interference canceller, the narrowband interference detectors to reception all the way
Intermediate-freuqncy signal carries out Interference Detection, obtains Interference Detection information, and sends it to the narrow-band interference canceller, the narrowband
The another way intermediate-freuqncy signal that interference eliminator is received according to the Interference Detection information butt joint carries out narrow-band interference excision processing.This hair
It is bright that intermediate-freuqncy signal is detected using narrowband interference detectors to obtain the interference indicator information with the presence or absence of interference, for making
It states narrow-band interference canceller and works in adaptive state, when detecting to disturb there is no narrowband, the narrow-band interference canceller
Frequency domain filtering is not carried out to the intermediate-freuqncy signal, reduce system power dissipation；Detecting that the narrowband disturbs there are during narrowband interference
Detector also provides the index information of interference frequency point for the narrow-band interference canceller, makes narrow-band interference canceller only dry to existing
The carry out frequency domain filtering for the frequency point disturbed has good Suppression of narrow band interference effect, and the index information of the interference frequency point
It is to carry out newer after all frequency points scan completion, renewal frequency is low, advantageously reduces power consumption, and the update cycle is far small
In the duration of narrowband interference, information update will not be caused not in time；And the integration lengths of narrowband interference detectors can root
It is made choice according to interference strength, improves the sensitivity of narrowband interference detectors；In addition the narrowband interference detectors can also root
According to the different window function of narrow-band interference strength selection side lobe attenuation, make to have reduced to greatest extent while narrowband interference is filtered out
With the loss of signal, optimum performance is obtained；Since narrowband interference characteristic will not change in the short time, thus it is provided with programmable control
The control that device processed periodically opens and closes narrowband interference detectors reduces the working time of narrowband interference detectors,
Reduce system power dissipation；In addition, detecting there are during narrowband interference, narrow-band interference canceller is by the another way intermediate-freuqncy signal of reception
It is divided into two-way, and windowing process is carried out respectively to two-way intermediate-freuqncy signal using two window functions, one of window function is another
A window function cycle translates what 1/2 window function length obtained afterwards, eliminates a delay before original windowing process
A Postponement module and mass data alignment operation before module and overlap-add procedure, advantageously reduce hardware resource and work(
Consumption, and design verification complexity and risk are reduced, system running speed is helped to improve, there is stronger practicability.
Description of the drawings
Fig. 1 is a kind of baseband signal frequency domain narrowband Interference Detection cancellation element schematic diagram of the embodiment of the present invention 1；
Fig. 2 be the embodiment of the present invention 1 a kind of baseband signal frequency domain narrowband Interference Detection cancellation element in mark judge with
Index the schematic diagram of computing module；
Fig. 3 is a kind of baseband signal frequency domain narrowband Interference Detection removing method flow chart of the embodiment of the present invention 2.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
Embodiment 1, a kind of baseband signal frequency domain narrowband Interference Detection cancellation element.With reference to Fig. 1 and Fig. 2 to this reality
The device for applying example offer is described in detail.
Referring to Fig. 1 and Fig. 2, a kind of baseband signal frequency domain narrowband Interference Detection cancellation element, described device includes narrowband
Interference detector, programmable controller and narrow-band interference canceller.
The narrowband interference detectors for carrying out Interference Detection to the another way intermediate-freuqncy signal of reception, obtain interference inspection
Measurement information, and the narrow-band interference canceller is sent it to, the Interference Detection information specifically includes interference indicator information, does
Scrambling point index information and window function index information.
Specifically, the narrowband interference detectors specifically include the first adding window module, sine-wave generator, correlator, product
Divide and judge with dump block, magnitude calculation module, thresholding computing module, mark with indexing computing module, interface module, control mould
Block, maximum value calculation module, window function selecting module and index information sending module.
The first adding window module, for being indexed according to pre-set window function or according to the window function of reception
The window function that information obtains carries out windowing process to the intermediate-freuqncy signal of reception.
Specifically, the first adding window module is before all frequency points complete single passes in the intermediate frequency signal band,
The window function of the attenuation gear of a compromise, such as 60dB, docking are usually pre-selected in the window function for there are multiple attenuation gears
The intermediate-freuqncy signal received carries out windowing process；After all frequency points complete single pass in the intermediate frequency signal band, root
The window function index information sent according to the window function selecting module selects more particularly suitable window function, to the intermediate frequency of reception
Signal carries out windowing process.The bandwidth of the intermediate-freuqncy signal of different system is different, such as global positioning system (Global
Positioning System, GPS) signal bandwidth for 2.046MHz, only need to believe intermediate frequency when being scanned frequency point
Frequency point in number frequency band is handled.
The sine-wave generator, the frequency information of the current frequency point for being sent according to the control module carry out phase
It is cumulative to obtain phase information, and sinusoidal and cosine signal is obtained simultaneously with being searched in cosine table sinusoidal according to the phase information
Correlator is output this to, the frequency information of the current frequency point is frequency information and default frequency steps by a upper frequency point
It is long to be added what is obtained.
The correlator, for the intermediate-freuqncy signal after windowing process and described sinusoidal and cosine signal simultaneously into
Row relevant treatment obtains two-way orthogonal signalling.
Specifically, realization is combined using the first adding window module, the sine-wave generator and the correlator
Shift frequency and filtering frequency-selecting purpose, the sine-wave generator and the correlator to signal carry out signal shift frequency, and
With reference to the filtering frequency-selecting of the complete pair signals of the first adding window mould window function in the block, and reduce spectral leakage.
The integration and dump block, for the two-way orthogonal signalling to be grown according to the integration that the control module is sent
Degree carries out coherent integration, and integral result is sent to the magnitude calculation module, and the integral result is reset, wherein,
The integration lengths have multiple gears, are made choice according to the narrow-band interference strength that intermediate-freuqncy signal needs eliminate.
Specifically, described integrate with dump block according to the integration lengths that the control module is sent to forming the integration
M quadrature signal samples point of length carries out coherent integration, wherein, M is 2 exponential depth, and integral result is sent to described
Magnitude calculation module, while integral result is reset to carry out M quadrature signal samples point for forming next integration lengths
Coherent integration, the integration lengths make choice according to the narrow-band interference strength that intermediate-freuqncy signal needs eliminate, the intermediate frequency
The narrow-band interference strength that eliminates of signal needs is lower, it is necessary to the integration lengths of selection are longer, otherwise shorter.Wherein, the integration
Length has multiple gears, such as 512,1024 or 2048 for 2 exponential depth gear, it is general using than narrow-band interference canceller
The longer signal analysis length of middle FFT/IFFT computing modules to be directed to different narrowband interference detection sensitivity requirements, provides
Corresponding signal processing gain enables the undetectable interference frequency point in the filter module after FFT computing modules
It is detected in the narrowband interference detectors, further, since the narrowband interference detectors are operated in serial mode, increases
Its integration lengths is added only slightly to increase complexity, system power dissipation will not be caused.
The magnitude calculation module for being calculated according to the integral result, obtains the frequency spectrum modulus value of current frequency point.
The thresholding computing module, for obtaining the thresholding of current frequency point according to the frequency spectrum magnitude calculation of the current frequency point
Critical value.
It is described mark judge with index computing module, for according to the current frequency point frequency spectrum modulus value, the current frequency
The interference mark is calculated in the frequency point index information for all frequency points that the thresholding critical value and the control module of point are sent
Will information and the interference frequency point index information.
Specifically, the mark judges to specifically include ratio computing unit, frequency point index sliding window with index computing module
Mouth computing unit and frequency point index buffer cell.
The ratio computing unit, for calculating the frequency spectrum modulus value of the current frequency point compared with the door of the current frequency point
Limit the multiple proportional of critical value.
Specifically, the narrow-band interference canceller needs detection interference frequency point first when carrying out frequency domain filtering, for straight
Frequency expansion sequence and thermal noise frequency spectrum are connect, power spectrum all has white noise character, so the detection of interference frequency point can pass through
The spectral shaping for comparing each frequency point realizes that the frequency point that frequency spectrum modulus value is noticeably greater than average is considered dry with thresholding critical value
It disturbs, so needing using ratio computing unit, for calculating the frequency spectrum modulus value of the current frequency point compared with the current frequency point
Thresholding critical value multiple proportional.
The frequency point indexes sliding window computing unit, for receiving the frequency point for all frequency points that the control module is sent
Index information, and the multiple proportional obtained according to the ratio computing unit, to the frequency point index information of current frequency point into
Rower is noted, if the multiple proportional is more than 1, needs near the current frequency point are calculated according to the size of the multiple proportional
Mark the mark scope of the frequency point of interference, and the frequency point index information of all frequency points in the range of the mark and current frequency point
There is interference in upper mark, obtain the interference frequency point index information；Otherwise marked not on the frequency point index information of current frequency point
There are interference.
Specifically, the frequency point index sliding window computing unit is used to receive all frequency points that the control module is sent
Frequency point index information, and the multiple proportional obtained according to the ratio computing unit indexes the frequency point of current frequency point
Information is labeled, if the multiple proportional is more than 1, the current frequency point is the frequency point for existing interference, in order to only filter out presence
The frequency point of interference calculates the current frequency point, it is necessary to according to the difference of interference strength i.e. according to the size of the multiple proportional
The mark scope of the frequency point of mark interference is nearby needed, and then obtains the frequency for the frequency point that mark is needed to disturb in the range of the mark
Point index information, and on the frequency point index information of all frequency points in the range of the mark and current frequency point mark exist it is dry
It disturbs, obtains the interference frequency point index information；If the multiple proportional is less than 1, on the frequency point index information of current frequency point
There is no interference for mark.Frequency point index sliding window computing unit has the function of first in first out, when calculating frequency band successively
During the frequency spectrum of interior each frequency point, the frequency point index information in the frequency point index sliding window computing unit also slides successively, when
When some frequency point index information will remove the frequency point index sliding window computing unit, whether it is labeled with the presence of interference according to it
Information, it is determined whether the frequency point index information is write into the frequency point and indexes buffer cell：If be labeled with there are interference information,
Then write the frequency point index buffer cell；Otherwise it is not written into.
The frequency point indexes buffer cell, for storing the described dry of the frequency point index sliding window computing unit transmission
Scrambling point index information, and after the completion of all frequency point scannings, according to whether being stored with the interference frequency point index information, obtain
To the interference markup information.
Specifically, the frequency point index buffer cell indexes sliding window computing unit for writing and storing the frequency point
The index information of the interference frequency point is sent, and after the completion of all frequency point scannings, according to whether being stored with the interference frequency
Point index information, obtains the interference markup information.Even described frequency point index buffer cell is stored with the interference frequency point rope
Fuse ceases, and the frequency point index buffer cell is not sky, then obtains the interference markup information in the presence of interference；If the frequency point
Sliding window computing unit is indexed not to the frequency point index buffer cell output interference frequency point index information, the frequency
Point index buffer cell is sky, then obtains being not present the interference markup information of interference.
The interface module, for storing the interference indicator information and the interference frequency point index information, and in institute
After some frequency points complete scanning, the interference indicator of storage is believed according to the output enable signal that the control module is sent
Breath is exported with the interference frequency point index information to the narrow-band interference canceller.
The control module, for frequency information that the current frequency point is sent to the sine-wave generator and to institute
It states integration and sends the integration lengths with dump block, be additionally operable to send to frequency point index sliding window computing unit all
It the frequency point index information of frequency point and sends the output enable signal to the interface module and controls the interface module to institute
It states narrow-band interference canceller and exports the Interference Detection information.
Maximum value calculation module, for by the size of the frequency spectrum modulus value of the current frequency point and currently stored frequency spectrum modulus value
It is compared, using frequency spectrum modulus value larger in the two as currently stored frequency spectrum modulus value, and continues the frequency with next frequency point
Spectrum modulus value is compared, and after all frequency points complete scanning, obtains frequency spectrum modulus value maximum in all frequency points, wherein, institute
Currently stored frequency spectrum modulus value is stated as frequency spectrum modulus value maximum in scanned all frequency points.
Window function selecting module is strong for obtaining the interference of the narrowband of the intermediate-freuqncy signal according to the frequency spectrum modulus value of the maximum
Degree, and the different window function of side lobe attenuation is selected according to the size of the narrow-band interference strength, and then obtain corresponding window function
Index information.
Index information sending module carries out for the window function index information received to be sent to the interface module
Storage, and the window function index information is exported together with the interference indicator information and the interference frequency point index information
To the narrow-band interference canceller, while the window function index information is also sent to the first adding window module as window letter
Several selection gists.
Specifically, frequency spectrum modulus value maximum in all frequency points that the maximum value calculation module obtains is mainly by described
What the narrow-band interference strength of frequency signal determined, it is possible to the selection of window function is determined according to the frequency spectrum modulus value of the maximum,
It is for selection that the window function of multiple attenuation gears is configured in practice, as 40dB, 50dB etc. are incremented by successively until 80dB's
Kaiser window functions series.Before all frequency points complete single pass in the intermediate frequency signal band, i.e., in the window function
Before selecting module obtains suitable window function index information according to the frequency spectrum modulus value of the maximum not yet, first adding window
Module usually have it is multiple attenuation gears window functions in be pre-selected one compromise attenuation gear window function, such as 60dB,
And window function is switched to more by the window function index information sent after single pass is completed according to the window function selecting module
Rational selection.
The programmable controller, for generating switch controlling signal according to the default time cycle, and then described in control
Narrowband interference detectors periodically open and close, and intermittently work.
Specifically, the programmable timer is used to generate the switch controlling signal of the narrowband interference detectors.By
In narrowband in practice, interference usually has interval feature, off and on, has certain duration, and narrowband interference characteristic is being held
Its time-frequency stability of characteristics in renewing, will not change, if the narrowband interference detectors are run always, can cause in a short time
Unnecessary power consumption, so the narrowband interference detectors can be with pause switch, after opening the narrowband interference detectors every time
The obtained Interference Detection information, can as the input signal with the narrow-band interference canceller in latter section of preset time,
It so can not only ensure that the Interference Detection information upgraded in time, but also the time of the narrowband interference detectors work can be reduced
And then reduce system power dissipation.So to the programmable controller can be set to generate switch control letter the default time cycle
Number, and then the narrowband interference detectors is controlled periodically to open and close, intermittently work.
The narrow-band interference canceller, the intermediate-freuqncy signal all the way for being received according to the Interference Detection information butt joint carry out narrow
Band interference elimination treatment, if the interference indicator information shows the intermediate-freuqncy signal there is no narrowband interference, the narrowband is done
Static condenser carries out the intermediate-freuqncy signal bypass delay disposal and outputs it；If in the presence of according to the interference frequency point rope
Fuse ceases and window function index information carries out the intermediate-freuqncy signal narrow-band interference excision processing and outputs it.
Specifically, the narrow-band interference canceller specifically include judgment module, bypass Postponement module, the second adding window module,
Shift adding window module, FFT computing modules, filter module, IFFT computing modules, laminating module and selection output module.
The judgment module, the another way that the interference indicator information butt joint for being sent according to the interface module is received
Intermediate-freuqncy signal is exported, if the interference indicator information shows the intermediate-freuqncy signal there is no narrowband interference, in described
Frequency signal output gives the bypass Postponement module；If in the presence of the intermediate-freuqncy signal is divided into two-way, is exported respectively to described
Two adding window modules and the displacement adding window module.
The bypass Postponement module, for carrying out delay disposal to the intermediate-freuqncy signal of reception.
The second adding window module, the window function index information for being sent according to the interface module are corresponded to
Window function, and then windowing process is carried out to the intermediate-freuqncy signal all the way of reception according to the window function.
The displacement adding window module, the window function index information for being sent according to the interface module are corresponded to
Window function, and its cycle is translated into N/2 length, window function after then being translated according to the cycle is to the another way intermediate frequency of reception
Signal carries out windowing process, and wherein N is the length of window function.
The FFT computing modules, for by the time-domain signal after the second adding window module windowing process and displacement will to be passed through
Time-domain signal after the displacement windowing process of adding window module carries out FFT calculating respectively.
The filter module, the interference frequency point index information for being sent according to the interface module will pass through FFT
The frequency point that there is interference in the two-way frequency-region signal of calculating carries out frequency domain filtering processing.
The IFFT computing modules, by the two-way frequency-region signal for passing through frequency domain filtering processing to be carried out based on IFFT respectively
It calculates.
The laminating module, for the two-way time-domain signal for passing through IFFT calculating to be overlapped processing, when obtaining all the way
Domain signal.
Specifically, added respectively there are the intermediate-freuqncy signal is divided into two-way during narrowband interference in the intermediate-freuqncy signal
Window processing translates the displacement adding window mould window function cycle in the block obtained by the window function index information N/2 long
Degree, wherein N are the length of window function, and the second adding window mould window function in the block obtained by the window function index information is not made
Reason, after being translated using the cycle window function and the window function that does not deal with two-way intermediate-freuqncy signal is carried out respectively displacement windowing process with
Windowing process so after IFFT computing modules processing, can directly export two-way time-domain signal to the superposition mould
Block, a Postponement module before eliminating windowing process and a Postponement module before overlap-add procedure and substantial amounts of number
According to alignment operation.
The selection output module, for receiving the bypass delay mould when the intermediate-freuqncy signal is disturbed there is no narrowband
Block send delay after intermediate-freuqncy signal and output it, alternatively, the intermediate-freuqncy signal there are during narrowband interference receive described in
The time-domain signal all the way of laminating module transmission is simultaneously output it.
Embodiment 2, a kind of baseband signal frequency domain narrowband Interference Detection removing method.The present embodiment is carried with reference to Fig. 3
The method of confession is described in detail.
Referring to Fig. 3, intermediate-freuqncy signal S1, is divided into two-way, signal output is to narrowband interference detectors, another way output all the way
To narrow-band interference canceller.
S2, the narrowband interference detectors carry out Interference Detection to the intermediate-freuqncy signal all the way of reception, obtain Interference Detection letter
Breath, and the narrow-band interference canceller is sent it to, the Interference Detection information specifically includes interference indicator information, interference frequency
Point index information and window function index information.
The S2 specifically includes following steps：
S21, the narrowband interference detectors are according to pre-set window function or the window function rope according to reception
The window function that fuse ceases carries out windowing process to the intermediate-freuqncy signal of reception, then the intermediate frequency after windowing process is believed
Number relevant treatment is carried out at the same time with sinusoidal and cosine signal, obtains two-way orthogonal signalling, wherein, the sinusoidal and cosine letter
Number it is to be obtained according to the frequency information of current frequency point sinusoidal with being searched in cosine table, the frequency information of the current frequency point is
It is added by the frequency information of a upper frequency point with default frequency step.
Specifically, the narrowband interference detectors all frequency points in the intermediate frequency signal band complete single passes it
Before, the window function of the attenuation gear of a compromise is usually pre-selected in the window functions for there are multiple attenuation gears, such as 60dB is right
The intermediate-freuqncy signal received carries out windowing process；After all frequency points complete single pass in the intermediate frequency signal band,
More particularly suitable window function is selected according to obtained window function index information, the intermediate-freuqncy signal of reception is carried out at adding window
Reason.Then the intermediate-freuqncy signal after windowing process and sinusoidal and cosine signal are carried out at the same time relevant treatment, obtain two-way just
Signal, the filtering frequency-selecting of complete pair signals are handed over, and reduces spectral leakage, wherein, the sinusoidal and cosine signal is basis
For the frequency information of current frequency point sinusoidal with searching what is obtained in cosine table, the frequency information of the current frequency point is by upper one
The frequency information of frequency point is added with default frequency step.The bandwidth of the intermediate-freuqncy signal of different system be it is different,
It is 2.046MHz such as the bandwidth of global positioning system (Global Positioning System, GPS) signal, to frequency
Point only needs to handle the frequency point in intermediate frequency signal band when being scanned.
S22, the two-way orthogonal signalling are obtained into integral result according to integration lengths progress coherent integration, and according to described
The frequency spectrum modulus value of current frequency point is calculated in integral result, is then obtained currently according to the frequency spectrum magnitude calculation of the current frequency point
The thresholding critical value of frequency point, wherein the integration lengths have multiple gears, the narrowband eliminated according to intermediate-freuqncy signal needs
Interference strength makes choice.
Specifically, according to default integration lengths, phase is carried out to M quadrature signal samples point for forming the integration lengths
Dry integration, wherein, M is 2 exponential depth, and the frequency spectrum modulus value of current frequency point, Ran Hougen are calculated according to the integral result
The thresholding critical value of current frequency point is obtained according to the frequency spectrum magnitude calculation of the current frequency point, wherein, the integration lengths are according to institute
It states the narrow-band interference strength that intermediate-freuqncy signal needs eliminate to make choice, the narrow-band interference strength that the intermediate-freuqncy signal needs eliminate is got over
It is low that, it is necessary to which the integration lengths of selection are longer, on the contrary shorter, the integration lengths have multiple gears, and such as 512,1024 or 2048
Deng the gear of the exponential depth for 2, the signal analysis length longer than narrow-band interference canceller is generally used, it is different narrow to be directed to
Band interference detection sensitivity requirement, provides corresponding signal processing gain, make in the narrow-band interference canceller detection less than
Interference frequency point be detected in the narrowband interference detectors, further, since the narrowband interference detectors are operated in
Serial mode, increasing its integration lengths only can slightly increase complexity, will not cause system power dissipation.
S23, according to the frequency spectrum modulus value of the current frequency point, the thresholding critical value of the current frequency point and all frequency points
The interference indicator information and the interference frequency point index information is calculated in frequency point index information, and by the interference indicator
Information and the interference frequency point index information are stored, and then carry out the scanning of next frequency point.
Specifically, the narrow-band interference canceller needs detection interference frequency point first when carrying out frequency domain filtering, for straight
Frequency expansion sequence and thermal noise frequency spectrum are connect, power spectrum all has white noise character, so the detection of interference frequency point can pass through
The spectral shaping for comparing each frequency point realizes that the frequency point that frequency spectrum modulus value is noticeably greater than average is considered dry with thresholding critical value
It disturbs, so the frequency spectrum modulus value for needing to calculate the current frequency point is compared with the multiple ratio of the thresholding critical value of the current frequency point
Example.
Then the frequency point index information of current frequency point is labeled according to the multiple proportional, if the multiple proportional is big
In 1, the current frequency point is the frequency point for existing interference, in order to only filter out the frequency point in the presence of interference, it is necessary to according to interference strength
For difference i.e. according to the size of the multiple proportional, calculating the current frequency point nearby needs the mark model of frequency point of mark interference
It encloses, and then obtains the frequency point index information for the frequency point that mark is needed to disturb in the range of the mark, and in the range of the mark
On all frequency points and the frequency point index information of current frequency point there is interference in mark, obtain the interference frequency point index information；If
The multiple proportional is less than 1, then there is no interference for mark on the frequency point index information of current frequency point.
If the multiple proportional of current frequency point is more than 1, the current frequency point is the frequency point for existing interference, specifically with Bradley
Exemplified by Ke Man (Blackman) window, it is as shown in table 1 that frequency spectrum modulus value maximum (at zero-frequency) nearby normalizes modulus value, at zero-frequency
Frequency spectrum modulus value is up to 1, and the frequency spectrum modulus value size in the range of ± 3 Δ f near zero-frequency point is as shown in table 1, wherein, Δ f is FFT
Frequency resolution.It need to only consider whether frequency point is to disturb frequency point i.e. in the range of ± 3 Δ f near current frequency point in Bl ackman windows
It can.According to table 1 strategy as shown in table 2 can be taken to obtain the mark scope for the frequency point that current frequency point nearby needs mark to disturb, than
Thresholding critical value such as the current frequency point takes 1, if the multiple proportional (Ratio) is more than or equal to 1 and less than 1/0.2948,
The index information of frequency point in the range of ± 1 Δ f near current frequency point is noted as the presence of interference.
Table 1
Table 2
The interference frequency point index information is stored, and after the completion of all frequency point scannings, according to whether storage
There is the interference frequency point index information, obtain the interference markup information, if being stored with the interference frequency point index information,
To the interference markup information that there is interference, otherwise, obtain being not present the interference markup information of interference.
S24, after all frequency points complete scanning, according to output enable signal by the interference indicator information of storage
It is exported with the interference frequency point index information to the narrow-band interference canceller.
In addition, the size by the frequency spectrum modulus value of the obtained current frequency points of the S22 and currently stored frequency spectrum modulus value
It is compared, using frequency spectrum modulus value larger in the two as currently stored frequency spectrum modulus value, and continues the frequency with next frequency point
Spectrum modulus value is compared, and after all frequency points complete scanning, obtains frequency spectrum modulus value maximum in all frequency points, wherein, institute
Currently stored frequency spectrum modulus value is stated as frequency spectrum modulus value maximum in scanned all frequency points.
The frequency spectrum modulus value of the maximum is mainly what is determined by the narrow-band interference strength of the intermediate-freuqncy signal, it is possible to root
The selection of window function is determined according to the frequency spectrum modulus value of the maximum, and side lobe attenuation is selected not according to the size of the narrow-band interference strength
Same window function, and then obtain corresponding window function index information.
Then the window function index information is stored, and by the window function index information and the interference indicator
Information and the interference frequency point index information are exported together to the narrow-band interference canceller, while also by the window function rope
Fuse ceases the selection gist as window function described in the S21.
It is for selection that the window function of multiple attenuation gears can be generally configured in practice, such as 40dB, 50dB etc. successively
It is incremented by the Kaiser window functions series until 80dB.Before all frequency points complete single pass in the intermediate frequency signal band,
I.e. before suitable window function index information is obtained according to the frequency spectrum modulus value of the maximum not yet, usually there are multiple attenuation
The window function of the attenuation gear of a compromise, such as 60dB, and the root after single pass is completed are pre-selected in the window function of gear
According to obtaining window function index information and be switched to window function more reasonably to select.
The another way intermediate-freuqncy signal that S3, the narrow-band interference canceller are received according to the Interference Detection information butt joint carries out narrow
Band interference elimination treatment, if the interference indicator information shows the intermediate-freuqncy signal there is no narrowband interference, the narrowband is done
Static condenser carries out the intermediate-freuqncy signal bypass delay disposal and outputs it；If in the presence of according to the interference frequency point rope
Fuse ceases and window function index information carries out the intermediate-freuqncy signal narrow-band interference excision processing and outputs it.
The S3 specifically includes following steps：
S31, according to the interference detector send the interference indicator information butt joint receive another way intermediate-freuqncy signal into
Row processing.
If S32, the interference indicator information show the intermediate-freuqncy signal there is no narrowband interference, by the intermediate-freuqncy signal
It carries out bypass delay disposal and outputs it；If in the presence of, the intermediate-freuqncy signal is divided into two paths of signals, and according to the interference
The window function index information that detector is sent obtains corresponding window function, by the intermediate-freuqncy signal all the way in two-way intermediate-freuqncy signal
According to the window function carry out windowing process, another way intermediate-freuqncy signal the window function cycle translate N/2 length after, according to
Window function after cycle translation carries out it windowing process, and wherein N is the length of window function.
S33, by the time-domain signal after windowing process and by displacement windowing process after time-domain signal respectively into
Row FFT is calculated.
S34, the two-way frequency that will be calculated according to the interference frequency point index information that the interference detector is sent by FFT
The frequency point that there is interference in the signal of domain carries out frequency domain filtering processing.
S35, the two-way frequency-region signal after frequency domain filtering processing is subjected to IFFT calculating respectively, then counts IFFT
Two-way time-domain signal after calculation is overlapped processing, obtains time-domain signal all the way, and outputs it.
In addition, using the programmable controller that switch controlling signal is generated according to the default time cycle, control described narrow
Band interference detector periodically opens and closes, and intermittently works.
Specifically, the programmable timer is used to generate the switch controlling signal of the narrowband interference detectors.By
In narrowband in practice, interference usually has interval feature, off and on, has certain duration, and narrowband interference characteristic is being held
Its time-frequency stability of characteristics in renewing, will not change, if the narrowband interference detectors are run always, can cause in a short time
Unnecessary power consumption, so the narrowband interference detectors can be with pause switch, after opening the narrowband interference detectors every time
The obtained Interference Detection information, can as the input signal with the narrow-band interference canceller in latter section of preset time,
It so can not only ensure that the Interference Detection information upgraded in time, but also the time of the narrowband interference detectors work can be reduced
And then reduce system power dissipation.Switch control is generated according to the default time cycle so can be set to the programmable controller
Signal, and then the narrowband interference detectors is controlled periodically to open and close, intermittently work.
The present invention provides a kind of baseband signal frequency domain narrowband Interference Detection cancellation element and methods, and intermediate-freuqncy signal is divided into
Two-way is exported respectively to narrowband interference detectors and narrow-band interference canceller, the narrowband interference detectors to reception all the way
Intermediate-freuqncy signal carries out Interference Detection, obtains Interference Detection information, and sends it to the narrow-band interference canceller, the narrowband
The another way intermediate-freuqncy signal that interference eliminator is received according to the Interference Detection information butt joint carries out narrow-band interference excision processing.This hair
It is bright that intermediate-freuqncy signal is detected using narrowband interference detectors to obtain the interference indicator information with the presence or absence of interference, for making
It states narrow-band interference canceller and works in adaptive state, when detecting to disturb there is no narrowband, the narrow-band interference canceller
Frequency domain filtering is not carried out to the intermediate-freuqncy signal, reduce system power dissipation；Detecting that the narrowband disturbs there are during narrowband interference
Detector also provides the index information of interference frequency point for the narrow-band interference canceller, makes narrow-band interference canceller only dry to existing
The carry out frequency domain filtering for the frequency point disturbed has good Suppression of narrow band interference effect, and the index information of the interference frequency point
It is to carry out newer after all frequency points scan completion, renewal frequency is low, advantageously reduces power consumption, and the update cycle is far small
In the duration of narrowband interference, information update will not be caused not in time；And the integration lengths of narrowband interference detectors can root
It is made choice according to interference strength, improves the sensitivity of narrowband interference detectors；In addition the narrowband interference detectors can also root
According to the different window function of narrow-band interference strength selection side lobe attenuation, make to have reduced to greatest extent while narrowband interference is filtered out
With the loss of signal, optimum performance is obtained；Since narrowband interference characteristic will not change in the short time, thus it is provided with programmable control
The control that device processed periodically opens and closes narrowband interference detectors reduces the working time of narrowband interference detectors,
Reduce system power dissipation；In addition, detecting there are during narrowband interference, narrow-band interference canceller is by the another way intermediate-freuqncy signal of reception
It is divided into two-way, and windowing process is carried out respectively to two-way intermediate-freuqncy signal using two window functions, one of window function is another
A window function cycle translates what 1/2 window function length obtained afterwards, eliminates a delay before original windowing process
A Postponement module and mass data alignment operation before module and overlap-add procedure, advantageously reduce hardware resource and work(
Consumption, and design verification complexity and risk are reduced, system running speed is helped to improve, there is stronger practicability.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of baseband signal frequency domain narrowband Interference Detection cancellation element, which is characterized in that described device includes narrowband interference inspection
Survey device and narrow-band interference canceller；
The narrowband interference detectors for carrying out Interference Detection to the intermediate-freuqncy signal all the way of reception, obtain Interference Detection information,
And the narrow-band interference canceller is sent it to, the Interference Detection information specifically includes interference indicator information, interference frequency point
Index information and window function index information；
The narrow-band interference canceller, the another way intermediate-freuqncy signal for being received according to the Interference Detection information butt joint carry out narrowband
Interference elimination treatment, if the interference indicator information shows the intermediate-freuqncy signal, there is no narrowband interference, the narrowband interference
Arrester carries out the intermediate-freuqncy signal bypass delay disposal and outputs it；If in the presence of according to the interference frequency point index
Information and window function index information carry out the intermediate-freuqncy signal narrow-band interference excision processing and output it；
The narrowband interference detectors specifically include the first adding window module, sine-wave generator, correlator, integration with resetting mould
Block, magnitude calculation module, thresholding computing module, mark judge and index computing module, interface module and control module；
The first adding window module, for according to pre-set window function or the window function index information according to reception
The window function of selection carries out windowing process to the intermediate-freuqncy signal of reception；
The sine-wave generator, the frequency information progress of the current frequency point for being sent according to the control module are phase-accumulated
Obtain phase information, and according to the phase information it is sinusoidal with searched in cosine table obtain sinusoidal and cosine signal and by its
To correlator, the frequency information of the current frequency point is frequency information and default frequency steps appearance by a upper frequency point for output
Add；
The correlator, for being carried out at the same time phase to the intermediate-freuqncy signal after windowing process and the sinusoidal and cosine signal
Pass is handled, and obtains two-way orthogonal signalling；
The integration and dump block, for by the two-way orthogonal signalling according to the integration lengths that the control module is sent into
Row coherent integration, and integral result is sent to the magnitude calculation module, and the integral result is reset, wherein, it is described
Integration lengths have multiple gears, are made choice according to the narrow-band interference strength that intermediate-freuqncy signal needs eliminate；
The magnitude calculation module for being calculated according to the integral result, obtains the frequency spectrum modulus value of current frequency point；
The thresholding computing module, it is critical for obtaining the thresholding of current frequency point according to the frequency spectrum magnitude calculation of the current frequency point
Value；
The mark judge with index computing module, for according to the current frequency point frequency spectrum modulus value, the current frequency point
The interference indicator letter is calculated in the frequency point index information for all frequency points that thresholding critical value and the control module are sent
Breath and the interference frequency point index information；
The interface module, for storing the interference indicator information and the interference frequency point index information, and all
After frequency point completes scanning, the output enable signal that is sent according to the control module by the interference indicator information of storage and
The interference frequency point index information is exported to the narrow-band interference canceller；
The narrow-band interference canceller specifically includes judgment module, bypass Postponement module, the second adding window module, displacement adding window mould
Block, FFT computing modules, filter module, IFFT computing modules, laminating module and selection output module；
The judgment module, the another way intermediate frequency that the interference indicator information butt joint for being sent according to the interface module is received
Signal is exported, if the interference indicator information shows that there is no narrowband interference, the intermediate frequency is believed for the intermediate-freuqncy signal
It number exports to the bypass Postponement module；If in the presence of, the intermediate-freuqncy signal is divided into two-way, export respectively to described second plus
Window module and the displacement adding window module；
The bypass Postponement module, for carrying out delay disposal to the intermediate-freuqncy signal of reception；
The second adding window module, the window function index information for being sent according to the interface module obtain corresponding window
Function, and then windowing process is carried out to the intermediate-freuqncy signal all the way of reception according to the window function；
The displacement adding window module, the window function index information for being sent according to the interface module obtains corresponding
Window function, and its cycle is translated into N/2 length, the window function after then being translated according to the cycle believes the another way intermediate frequency of reception
Number carry out windowing process, wherein N be window function length；
The FFT computing modules, for by the time-domain signal after the second adding window module windowing process and displacement adding window will to be passed through
Time-domain signal after module displacement windowing process carries out FFT calculating respectively；
The filter module, the interference frequency point index information for being sent according to the interface module will pass through FFT and calculate
Two-way frequency-region signal in exist interference frequency point carry out frequency domain filtering processing；
The IFFT computing modules, for the two-way frequency-region signal for passing through frequency domain filtering processing to be carried out IFFT calculating respectively；
The laminating module for the two-way time-domain signal for passing through IFFT calculating to be overlapped processing, obtains time domain letter all the way
Number；
The selection output module, for receiving the bypass Postponement module hair when the intermediate-freuqncy signal is disturbed there is no narrowband
Intermediate-freuqncy signal after the delay sent simultaneously is output it, alternatively, there are receive the superposition during narrowband interference in the intermediate-freuqncy signal
The time-domain signal all the way of module transmission is simultaneously output it.
A kind of 2. baseband signal frequency domain narrowband Interference Detection cancellation element as described in claim 1, which is characterized in that the mark
Will judges to specifically include with index computing module：
Ratio computing unit, for calculating the frequency spectrum modulus value of the current frequency point compared with the thresholding critical value of the current frequency point
Multiple proportional；
Frequency point indexes sliding window computing unit, and letter is indexed for receiving the frequency point for all frequency points that the control module is sent
Breath, and the frequency point index information of current frequency point is labeled according to the multiple proportional that the ratio computing unit is sent,
If the multiple proportional is more than 1, calculating the current frequency point according to the size of the multiple proportional nearby needs mark dry
The mark scope for the frequency point disturbed, and marked on the frequency point index information of all frequency points in the range of the mark and current frequency point
There are interference, obtain the interference frequency point index information；Otherwise there is no dry for mark on the frequency point index information of current frequency point
It disturbs；
Frequency point indexes buffer cell, for storing the interference frequency point rope that the frequency point index sliding window computing unit is sent
Fuse ceases, and after the completion of all frequency point scannings, according to whether being stored with the interference frequency point index information, obtains described dry
Disturb markup information.
3. a kind of baseband signal frequency domain narrowband Interference Detection cancellation element as described in claim 1, which is characterized in that described narrow
Band interference detector further includes：
Maximum value calculation module, for the size of the frequency spectrum modulus value of the current frequency point and currently stored frequency spectrum modulus value to be carried out
Compare, using frequency spectrum modulus value larger in the two as currently stored frequency spectrum modulus value, and continue the frequency spectrum mould with next frequency point
Value is compared, and after all frequency points complete scanning, obtains frequency spectrum modulus value maximum in all frequency points, wherein, it is described to work as
The frequency spectrum modulus value of preceding storage is frequency spectrum modulus value maximum in scanned all frequency points；
Window function selecting module, for obtaining the narrow-band interference strength of the intermediate-freuqncy signal according to the frequency spectrum modulus value of the maximum,
And the different window function of side lobe attenuation is selected according to the size of the narrow-band interference strength, and then obtain corresponding window function index
Information；
Index information sending module is deposited for the window function index information received to be sent to the interface module
Storage so that exported together with the window function index information and the interference indicator information and the interference frequency point index information to
The narrow-band interference canceller, while the window function index information is also sent to the first adding window module as window function
Selection gist.
4. such as a kind of baseband signal frequency domain narrowband Interference Detection cancellation element of claim 1-3 any one of them, feature exists
In described device further includes：
Programmable controller for generating switch controlling signal according to the default time cycle, and then controls the narrowband interference
The opening and closing of detector period, intermittently work.
5. a kind of baseband signal frequency domain narrowband Interference Detection removing method, which is characterized in that the described method includes：
S1, intermediate-freuqncy signal is divided into two-way, to narrowband interference detectors, another way is exported to disappear signal output to narrowband interference all the way
Except device；
S2, the narrowband interference detectors carry out Interference Detection to the intermediate-freuqncy signal all the way of reception, obtain Interference Detection information, and
The narrow-band interference canceller is sent it to, the Interference Detection information specifically includes interference indicator information, interference frequency point rope
Fuse ceases and window function index information；
The another way intermediate-freuqncy signal that S3, the narrow-band interference canceller are received according to the Interference Detection information butt joint carries out narrowband and does
Processing for removing is disturbed, if the interference indicator information shows the intermediate-freuqncy signal there is no narrowband interference, the narrowband interference disappears
Except device carries out the intermediate-freuqncy signal bypass delay disposal and outputs it；If in the presence of according to the interference frequency point index letter
Breath and window function index information carry out the intermediate-freuqncy signal narrow-band interference excision processing and output it；
The S2 is specifically included：
S21, according to pre-set window function or according to the window function index information of reception select window function, docking
The intermediate-freuqncy signal received carries out windowing process, then to the intermediate-freuqncy signal after windowing process and sinusoidal and cosine signal simultaneously
Relevant treatment is carried out, obtains two-way orthogonal signalling, wherein, the sinusoidal and cosine signal is believed according to the frequency of current frequency point
Cease sinusoidal with searching what is obtained in cosine table, the frequency information of the current frequency point be by a upper frequency point frequency information and
What default frequency step was added；
S22, the two-way orthogonal signalling are obtained into integral result according to integration lengths progress coherent integration, and according to the integration
As a result the frequency spectrum modulus value of current frequency point is calculated, current frequency point is then obtained according to the frequency spectrum magnitude calculation of the current frequency point
Thresholding critical value, wherein, the integration lengths have multiple gears, are disturbed according to the narrowband that eliminates of intermediate-freuqncy signal needs
Intensity makes choice；
S23, frequency spectrum modulus value, the thresholding critical value of the current frequency point and the frequency point of all frequency points according to the current frequency point
The interference indicator information and the interference frequency point index information is calculated in index information, and by the interference indicator information
And the interference frequency point index information is stored, and then carries out the scanning of next frequency point；
S24, after all frequency points complete scanning, according to output enable signal by the interference indicator information of storage and institute
Interference frequency point index information is stated to export to the narrow-band interference canceller；
The S3 is specifically included：
At the another way intermediate-freuqncy signal that S31, the interference indicator information butt joint sent according to the interference detector are received
Reason；
If S32, the interference indicator information show that there is no narrowband interference, the intermediate-freuqncy signal is carried out for the intermediate-freuqncy signal
Bypass delay disposal is simultaneously output it；If in the presence of, the intermediate-freuqncy signal is divided into two paths of signals, and according to the Interference Detection
Device send the window function index information obtain corresponding window function, by the intermediate-freuqncy signal all the way in two-way intermediate-freuqncy signal according to
The window function carries out windowing process, and another way intermediate-freuqncy signal is after the window function cycle translates N/2 length, according to the cycle
Window function after translation carries out it windowing process, and wherein N is the length of window function；
S33, the time-domain signal after windowing process and the time-domain signal after displacement windowing process are subjected to FFT respectively
It calculates；
S34, the two-way frequency domain calculated by FFT is believed according to the interference frequency point index information that the interference detector is sent
The frequency point that there is interference in number carries out frequency domain filtering processing；
S35, the two-way frequency-region signal after frequency domain filtering processing is subjected to I FFT calculating respectively, then calculates I FFT
Two-way time-domain signal afterwards is overlapped processing, obtains time-domain signal all the way, and outputs it.
6. a kind of baseband signal frequency domain narrowband Interference Detection removing method as claimed in claim 5, which is characterized in that described
According to the frequency of the frequency spectrum modulus value of the current frequency point, the thresholding critical value of the current frequency point and all frequency points described in S23
The interference indicator information is calculated in point index information and the interference frequency point index information specifically includes：
The frequency spectrum modulus value of the current frequency point is calculated compared with the multiple proportional of the thresholding critical value of the current frequency point, and according to
The multiple proportional is labeled the frequency point index information of current frequency point, if the multiple proportional is more than 1, according to described times
The size of number ratio calculates the mark scope for the frequency point that the current frequency point nearby needs mark to disturb, and in the mark model
It encloses mark on the frequency point index information of interior all frequency points and current frequency point and there is interference, obtain the interference frequency point index letter
Breath；Otherwise there is no interference for mark on the frequency point index of current frequency point；
The interference frequency point index information is stored, and after the completion of all frequency point scannings, according to whether storage is
Interference frequency point index information is stated, obtains the interference markup information.
7. a kind of baseband signal frequency domain narrowband Interference Detection removing method as claimed in claim 5, which is characterized in that described
It is further included after S22：
It, will be larger in the two by the frequency spectrum modulus value of the current frequency point compared with the size of currently stored frequency spectrum modulus value
Frequency spectrum modulus value continues as currently stored frequency spectrum modulus value compared with the frequency spectrum modulus value of next frequency point, all
After frequency point completes scanning, frequency spectrum modulus value maximum in all frequency points is obtained, wherein, the currently stored frequency spectrum modulus value is
Maximum frequency spectrum modulus value in all frequency points of scanned mistake；
The narrow-band interference strength of the intermediate-freuqncy signal is obtained according to the frequency spectrum modulus value of the maximum, and is disturbed by force according to the narrowband
The size of degree selects the different window function of side lobe attenuation, and then obtains corresponding window function index information；
The window function index information is stored so that the window function index information and the interference indicator information and
The interference frequency point index information is exported together to the narrow-band interference canceller, while is also made the window function index information
For the selection gist of window function described in the S21.
8. such as a kind of baseband signal frequency domain narrowband Interference Detection removing method of claim 5-7 any one of them, feature exists
In the method further includes：
Using the programmable controller that switch controlling signal is generated according to the default time cycle, the narrowband Interference Detection is controlled
Device periodically opens and closes, and intermittently works.
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