CN109212559A

CN109212559A - A kind of single-frequency and multifrequency GNSS signal Suppression of narrow band interference device, system and method

Info

Publication number: CN109212559A
Application number: CN201811117257.XA
Authority: CN
Inventors: 潘致利
Original assignee: Yongzhou Jinmayi New Energy Machinery Co Ltd
Current assignee: Yongzhou Jinmayi New Energy Machinery Co Ltd
Priority date: 2018-09-26
Filing date: 2018-09-26
Publication date: 2019-01-15

Abstract

The invention discloses a kind of single-frequency and multifrequency GNSS signal Suppression of narrow band interference devices, system and method, wherein, multifrequency GNSS signal Suppression of narrow band interference system includes at least one preprocessing module, at least one buffer process module, at least one buffer control module, at least one Postponement module, Multiplexing module, windowing processing module, FFT computing module, NBI filtering processing module, IFFT computing module, demultiplexing module, at least one superposition processing module and time-sharing multiplex control module.The present invention can carry out Suppression of narrow band interference to the GNSS signal of unifrequency and multi-frequency, not only have good inhibitory effect, additionally it is possible to reduce the power consumption of hardware resource cost and system, practicability is stronger.

Description

A kind of single-frequency and multifrequency GNSS signal Suppression of narrow band interference device, system and method

Technical field

The present invention relates to satellite navigation digital signal processing technique fields, and in particular to a kind of single-frequency and multifrequency GNSS signal Suppression of narrow band interference device, system and method.

Background technique

Global Navigation Satellite System (Global Navigation Satellite System, GNSS) signal is in global model Round-the-clock, real-time, the continuous high precision position information of interior offer, speed and temporal information are provided, play day in people's lives Beneficial important role.

GNSS signal uses spread spectrum technic, itself has strong anti-interference ability, and anti-interference ability is by spread processing Gain and bandwidth determine.But in practical communication, due to signal transmission power, equipment cost of implementation and by increase bandwidth cost Limitation, the anti-interference ability of spread spectrum communication are limited.The signal that GNSS signal reaches receiving antenna is very faint, can often drown out Among noise, it is easy by external interference, especially artificial interference.When interfering signal power is more than the anti-dry of spread spectrum communication When disturbing tolerance, communication performance just be cannot be guaranteed, it is necessary to guarantee communication quality using Anti-Jamming Technique.According to jamming bandwidth phase For the size of GNSS signal bandwidth, it is classified as broadband interference and narrowband interferes two kinds.Wherein, GNSS receiver is influenced most Greatly, the most common interference type is narrowband interference.Suppression of narrow band interference (Narrow Band in spread spectrum communication Interference, NBI) technology usually despreading processing before carry out, weaken narrowband interference sections, improve receive signal load It makes an uproar ratio.

Suppression of narrow band interference device in the prior art is broadly divided into the narrowband interference suppression based on adaptive-filtering of time domain Device and frequency domain processed based on FFT (Fast Fourier Transform, Fast Fourier Transform)/IFFT (Inverse Fast Fourier Transform, fast Fourier inverse transformation) Suppression of narrow band interference device.Time-domain filtering has hardware real The disadvantages of existing complexity is high, convergence time is slow, group delay variation；The Suppression of narrow band interference device based on FFT/IFFT of frequency domain It is the spectral characteristic for calculating the signal received using FFT, the frequency point that interference occurs is searched in frequency spectrum, and to the letter of the frequency point It number is filtered accordingly, so that reducing interference is receiving the influence in signal.Frequency domain algorithm is due to can use FFT/ IFFT fast algorithm reduces calculation amount, and can guarantee the linear phase of Interference Suppression System, and convergence problem is not present, obtains It is widely applied.

The common frequency domain filtering for unifrequency GNSS signal there are mainly two types of mode at present:

First way, simply based on the interference mitigation technology of FFT/IFFT, by GNSS signal by windowing process, FFT is calculated, is exported after NBI filtering processing and IFFT calculating, although this method can remove narrowband interference, windowing process exists Spectrum leakage when FFT is reduced, while avoiding interference from diffusing to other frequency points, exists and input signal is caused to distort, cause defeated The shortcomings that signal-to-noise ratio of signal incurs loss out.

The second way is based on OFFT (Overlapped Fast Fourier Transform, the quick Fourier of superposition Leaf transformation) interference mitigation technology be divided into two-way using by GNSS signal, respectively through 1/ on the basis of first way 2FFT block length postpones and does not postpone, and independently carries out adding window, FFT, interfering frequency and rejects, after IFFT, then according to certain Algorithm be combined, this method has many advantages, such as that design is easy, can filter out the interference of multiple narrowbands simultaneously, but needs 4 FFT (2 A FFT module and 2 IFFT modules) engine, hardware realization complexity is high, and frequency resolution is lower, decays to signal larger.

With the fast development of GNSS technology and the continuous improvement of application demand, alignment by union is carried out using multisystem signal Multimode multi-frequency GNSS system show great advantage.Multimode multi-frequency receiver can receive the satellite letter of multiple frequencies simultaneously Number, using multisystem combined location technology, so that positioning accuracy and reliability is got a greater increase, rapidly become navigation field Study and apply hot spot.But when carrying out NBI filtering using OFFT technology in multimode multi-frequency receiver at present, if receiving N simultaneously The satellite-signal of a frequency needs to replicate the OFFT processing module of N number of single frequency signal, and hardware resource cost will be at multiplication at this time Add, while also adding system power dissipation.

In addition, in FFT/IFFT hardware realization, generally use typical DIF (Decimation in Frequency, Frequency domain extracts) carry out FFT processing.That is FFT calculate data input in order, calculated result backward output, using this structure into When row IFFT, data are cached before input data with the processing of adjustment sequence, this does not only take up a large amount of memory spaces, And stream treatment delay is increased, demand of the system to storage resource was not only improved, but also reduce system real time.

To solve the above problems, proposing a kind of FFT construction design method of backward input Sequential output, solves IFFT band The extra storage demand and flowing water braking problems come, still, GNSS input intermediate-freuqncy signal are sequentially inputted by time domain, if pressing this side Method, it is necessary to input data sequence be handled by " bit reversed order " before FFT is calculated after windowing process, to be pressed to the data that FFT is inputted FFT butterfly computation sequence, at the same ensure that delay M/2 processing module and windowing processing module by time domain sequential processes, still, " bit reversed order " processing needs to increase memory and is stored, and expends biggish hardware resource.

Summary of the invention

Technical problem to be solved by the invention is to provide a kind of single-frequency and multifrequency GNSS signal Suppression of narrow band interference device, System and method can overcome above-mentioned the deficiencies in the prior art, realize and believe unifrequency GNSS signal and multi-frequency GNSS Number Suppression of narrow band interference.

The technical scheme to solve the above technical problems is that

According to one aspect of the present invention, a kind of single-frequency GNSS signal Suppression of narrow band interference device, described device are provided At Postponement module, windowing processing module, FFT computing module, NBI filtering processing module, IFFT computing module and superposition Manage module；

The Postponement module for receiving GNSS signal all the way, and is postponed M/2 sampled point and is exported to the adding window Processing module, wherein M is fft block length, specially 2 exponential depth；

The windowing processing module, for receiving delay M/2 of GNSS signal all the way and Postponement module transmission The GNSS signal of sampled point, and windowing process is carried out respectively to two-way time domain GNSS signal；

The FFT computing module, including real part input are inputted with imaginary part, for believing the two-way GNSS Jing Guo windowing process The input of real part all the way in number carries out FFT calculating, and the input of another way imaginary part carries out FFT calculating, and the plural FFT that will be calculated Signal carries out separation and two-way real number FFT signal is calculated；

Module is filtered in the NBI, for being filtered to the two-way frequency domain GNSS signal calculated by FFT；

The IFFT computing module, including real part input are inputted with imaginary part, for the two-way frequency domain by filtering processing The input of real part all the way in GNSS signal carries out IFFT calculating, and the input of another way imaginary part carries out IFFT calculating, and will be calculated Plural IFFT signal carry out separation two-way real number IFFT signal be calculated, and output it；

The superposition processing module, for being overlapped processing to received two-way time domain GNSS signal, when obtaining all the way Domain GNSS signal, and output it.

According to another aspect of the invention, a kind of single-frequency GNSS signal narrow-band interference rejection method, the side are provided Method includes:

S301, unifrequent time domain GNSS signal is divided into two-way, wherein M/2 sampled point of signal delay all the way, another Road signal does not postpone, and after delay and undelayed two-way GNSS signal is carried out windowing process respectively；

S302, the input of real part all the way in the two-way GNSS signal Jing Guo windowing process is subjected to FFT calculating, another way is empty Portion's input carries out FFT calculating, and the plural FFT signal being calculated is carried out separation, two-way real number FFT signal is calculated；

S303, it will be filtered by the two-way frequency domain GNSS signal that FFT is calculated, and by the two-way through being filtered The input of real part all the way in frequency domain GNSS signal carries out IFFT calculating, and the input of another way imaginary part carries out IFFT calculating, and will calculate Obtained plural IFFT signal carries out separation and two-way real number IFFT signal is calculated；

S304, the two-way time domain GNSS signal calculated by IFFT is overlapped processing, obtains time domain GNSS letter all the way Number, to carry out subsequent despreading processing.

Another aspect according to the present invention provides a kind of multifrequency GNSS signal Suppression of narrow band interference system, the system System includes single-frequency GNSS signal Suppression of narrow band interference device and at least one preprocessing module, at least one caching process mould Block, at least one buffer control module, Multiplexing module, demultiplexing module and time-sharing multiplex control module；

The preprocessing module, including format conversion unit and detecting signal unit, for being docked under RF clock domain The GNSS signal received formats, and carries out interferer signal detection to the GNSS signal after format conversion, to determine State whether GNSS signal needs to carry out Suppression of narrow band interference processing, and generate passage interference inhibition according to definitive result to make can control The signal and GNSS signal after being sent to the buffer control module and will test is exported to the buffer process module；Also GNSS signal output for returning to the buffer process module, to carry out subsequent despreading processing；

The buffer process module, for the GNSS signal after the write-in interferer signal detection under RF clock domain, then The GNSS signal is read under the control of the buffer control module, and whether is needed to carry out narrowband interference according to GNSS signal Inhibit the determination of processing as a result, the GNSS signal of reading to be returned to the preprocessing module output being correspondingly connected with or is sent To the Postponement module and the Multiplexing module being correspondingly connected with；

The buffer control module, for sending the channel to the time-sharing multiplex control module under system clock domain AF panel makes to can control signal and data cached ready transport indicator, and receives the time-sharing multiplex control module feedback Channel caching reads enable signal, and then controls the buffer process module work；

The Multiplexing module, the multichannel demultiplex control signal for being sent according to the time-sharing multiplex control module will The GNSS signal for undelayed multiple frequencies that successively received multiple buffer process modules are sent and multiple described prolong The GNSS signal of the multiple frequencies for the delay that slow module is sent is integrated into a channel, and according to the difference of frequency, at times Per the successively identical delay of transmission frequency and undelayed two-way GNSS signal to the windowing processing module；

The demultiplexing module, the multichannel demultiplexing control letter for being sent according to the time-sharing multiplex control module Number, the GNSS signal of the multiple different frequencies comprising two paths of signals being in a channel received at times is demultiplexed With being in multiple two-way GNSS signals in multiple channels according to the difference of frequency, and be sent respectively at multiple superpositions Manage module.

According to another aspect of the invention, a kind of multifrequency GNSS signal narrow-band interference rejection method, feature are provided It is, which comprises

S401, N number of preprocessing module pre-process received N number of GNSS signal under RF clock domain respectively, And the GNSS signal after pretreatment is exported to the N number of buffer process module being correspondingly connected with, while also by N number of described Buffer control module makes the passage interference inhibition can control signal respectively is sent to the time-sharing multiplex control module；

S402, N number of buffer process module is distinguished in the case where writing address successively differs M/4 under RF clock domain N number of GNSS signal is written, successively write it is full after, corresponding N number of buffer control module successively send it is data cached just Thread indication signal gives the time-sharing multiplex control module；The time-sharing multiplex control module is according to the data cached ready instruction Signal and the passage interference inhibition received before make to can control signal, and generation channel caching reading enable signal is simultaneously successively anti- It feeds N number of buffer control module；

S403, N number of buffer control module read enable signal according to the caching and control N number of caching process respectively Module reads N number of GNSS signal, if not needing to carry out Suppression of narrow band interference to GNSS signal, GNSS signal is returned to corresponding company The preprocessing module connect is exported to carry out subsequent despreading processing, terminates the inhibition process of current GNSS signal；If desired right GNSS signal carries out Suppression of narrow band interference, and GNSS signal is sent to the Postponement module being correspondingly connected with and the multiplexing mould Block；

S404, N number of Postponement module are under system clock domain, successively respectively by received GNSS signal delay M/2 Sampled point, and the GNSS signal after delay is sent to the Multiplexing module, the Multiplexing module is according to the time-sharing multiplex control The multichannel demultiplex control signal that molding block is sent does not postpone the GNSS signal of N number of frequency of received delay and successively The GNSS signal of N number of frequency be integrated into a channel, and successively to send frequency at times identical according to frequency different Delay and undelayed two-way GNSS signal give the windowing processing module, and what it is until N number of different frequency includes two paths of signals GNSS signal be all sent to the windowing processing module；

S405, the windowing processing module and FFT computing module are successively to received delay and undelayed two-way GNSS signal carries out windowing process and FFT calculation processing, and obtained calculated result is sent to the NBI, mould is filtered Block, the channel NBI filtering configuration signal that the NBI filtering processing module is sent according to the time-sharing multiplex control module is to filtering Parameter is configured, and then is filtered to two-way GNSS signal, and filter result is sent to the IFFT and calculates mould Block, the IFFT computing module carries out IFFT calculating to two-way GNSS signal, and the two-way GNSS signal after calculating is sent To the demultiplexing module, while IFFT is sent to the time-sharing multiplex control module and completes indication signal, the time-sharing multiplex Control module sends multichannel demultiplexing control signal to the demultiplexing control module according to the completion indication signal；

S406, the demultiplexing module demultiplex control signal according to the multichannel, make N number of two-way received at times GNSS signal is in N number of channel according to the difference of frequency, and is sent respectively to the N number of superposition processing mould being correspondingly connected with Block, received two-way time domain GNSS signal is overlapped processing respectively by N number of superposition processing module, and will be obtained all the way Time domain GNSS signal returns to the N number of buffer process module being correspondingly connected with and preprocessing module output respectively, to carry out Subsequent despreading processing.

A kind of single-frequency and multifrequency GNSS signal Suppression of narrow band interference device provided by the invention, system and method are realized To the Suppression of narrow band interference of the GNSS signal of unifrequency GNSS signal and multi-frequency.Wherein, the FFT computing module with IFFT computing module is equipped with real part input and inputs with imaginary part, can calculate simultaneously two-way GNSS signal, realize FFT With the shared multiplexing of IFFT computing module, reduce the hardware cost of FFT/IFFT computing module by half；The windowing process mould Block can carry out windowing process to two-way GNSS signal, share a window function coefficients R OM table, and according to the symmetry of window function M/2 windowed function coefficient is only stored, so saving the ROM resource of memory window function coefficients is original 1/4；The NBI Filtering processing module is simultaneously filtered two-way GNSS signal, and can be configured according to the GNSS signal of different frequency different Filtering parameter, keep filtering independence, effectively inhibit narrowband interference；It is dry that narrowband is carried out in the GNSS signal to N number of frequency When disturbing inhibition, the use point of module and IFFT computing module is filtered in the windowing processing module, FFT computing module, NBI Hardware resource is reduced to original 1/N by the mechanism of Shi Fuyong；The buffer process module is by GNSS signal according to FFT butterfly Order of operation is read, and the Postponement module and windowing processing module are believed according to FFT butterfly computation sequential processes GNSS Number, " bit reversed order " before FFT computing module is removed, M data storage cell is saved；The time-sharing multiplex control unit can According to the quantity automatic adjustment system clock frequency of the frequency of the GNSS signal of input, system power dissipation is reduced；In addition the pre- place Interferer signal detection can be carried out to GNSS signal by managing module, realized and handled the adaptive narrow-band AF panel of GNSS signal, And in the case where all GNSS signals all do not need to carry out Suppression of narrow band interference, close the Postponement module, at superposition Manage module, Multiplexing module, adding window module, FFT computing module, NBI filtering processing module, IFFT computing module and demultiplexing mould Block reduces system power dissipation.The present invention can carry out Suppression of narrow band interference to the GNSS signal of unifrequency and multi-frequency, not only have There is good inhibitory effect, additionally it is possible to reduce the power consumption of hardware resource cost and system, and there is stronger practicability.

Detailed description of the invention

Fig. 1 is a kind of single-frequency GNSS signal Suppression of narrow band interference schematic device of the embodiment of the present invention one；

Fig. 2 is a kind of single-frequency GNSS signal narrow-band interference rejection method flow chart of the embodiment of the present invention two；

Fig. 3 is a kind of multifrequency GNSS signal Suppression of narrow band interference system schematic of the embodiment of the present invention three；

Fig. 4 is a kind of multifrequency GNSS signal narrow-band interference rejection method flow chart of the embodiment of the present invention four.

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 invention.

Embodiment one, a kind of single-frequency GNSS signal Suppression of narrow band interference device.Below with reference to Fig. 1 to provided in this embodiment Device is described in detail.

Referring to Fig. 1, device provided in this embodiment includes Postponement module, windowing processing module, FFT computing module, NBI filter Wave processing module, IFFT computing module and superposition processing module.

The Postponement module for receiving GNSS signal all the way, and is postponed M/2 sampled point and is exported to the adding window Processing module, wherein M is fft block length, specially 2 exponential depth.

The windowing processing module, for receiving delay M/2 of GNSS signal all the way and Postponement module transmission The GNSS signal of sampled point, and windowing process is carried out respectively to two-way time domain GNSS signal.

Specifically, the windowing processing module be used for receives GNSS signal all the way and the Postponement module transmission prolong The GNSS signal of slow M/2 sampled point, wherein M is fft block length, specially 2 exponential depth, and by two-way time domain GNSS signal Respectively multiplied by searched in the coefficients R OM of windowed function (Read Only Memory, read-only memory) table same plus Window coefficient carries out windowing process, realizes shared multiplexing of the windowing processing module about two-way GNSS signal.Wherein, the adding window Function specifically includes rectangular window, quarter window, Hanning window, hamming window and Blackman window, and the windowed function is symmetrical letter Number, if the block length of FFT is M, the M coefficient corresponding to windowed function is respectively F₁,F₂,…,F_M, then have F_i=F_M+1-i(i= 1,2 ..., M/2-1), M/2 windowing coefficient, windowed function coefficients R OM table size need to be only stored in windowed function coefficients R OM table M/2 is only needed, can save the ROM table resource of memory window function coefficients is originally required 1/4.

The FFT computing module, including real part input are inputted with imaginary part, for believing the two-way GNSS Jing Guo windowing process The input of real part all the way in number carries out FFT calculating, and the input of another way imaginary part carries out FFT calculating, and the plural FFT that will be calculated Signal carries out separation and two-way real number FFT signal is calculated.

Specifically, the FFT computing module is real by the GNSS signal all the way in the two-way GNSS signal Jing Guo windowing process Portion's input carries out FFT calculating, and the input of another way GNSS signal imaginary part carries out FFT calculating, and the plural FFT signal that will be calculated It carries out separation and two-way real number FFT signal is calculated, two-way GNSS signal is transformed into frequency domain data from time domain data, realize Shared multiplexing of the FFT computing module about two-way GNSS signal, makes FFT computing module resource be reduced to original half.

Module is filtered in the NBI, for being filtered to the two-way frequency domain GNSS signal calculated by FFT.

Specifically, various filtering restrainable algorithms, such as Threshold detection method, K spectral line can be used in the NBI filtering processing module Algorithm and median filtering method etc., wherein when the GNSS signal of input is unifrequency, the filtering of the NBI filtering processing module Parameter is set in advance, keeps the independence of filtering.

The IFFT computing module, including real part input are inputted with imaginary part, for the two-way frequency domain by filtering processing The input of real part all the way in GNSS signal carries out IFFT calculating, and the input of another way imaginary part carries out IFFT calculating, and will be calculated Plural IFFT signal carry out separation two-way real number IFFT signal be calculated, and output it.

Specifically, the IFFT computing module believes the GNSS all the way in the two-way frequency domain GNSS signal by filtering processing The input of number real part carries out IFFT calculating, and the input of another way GNSS signal imaginary part carries out IFFT calculating, and the plural number that will be calculated Two-way real number IFFT signal is calculated in IFFT Signal separator, and two-way GNSS signal is transformed into time domain data from frequency domain data, It realizes shared multiplexing of the IFFT computing module about two-way GNSS signal, IFFT computing module resource is made to be reduced to original half.

Embodiment two, a kind of single-frequency GNSS signal narrow-band interference rejection method.Below with reference to Fig. 2 to provided in this embodiment Method is described in detail.

Referring to Fig. 1 and Fig. 2, unifrequent time domain GNSS signal S301, is divided into two-way, wherein signal delay M/2 all the way A sampled point, another way signal do not postpone, and after delay and undelayed two-way GNSS signal is carried out at adding window respectively Reason.

Specifically, unifrequent time domain GNSS signal is divided into two-way, Postponement module receive wherein signal all the way and by its Postpone M/2 sampled point, and the GNSS signal after delay is sent to the windowing processing module, the windowing processing module connects The GNSS signal of the M/2 sampled point of delay of another way GNSS signal and Postponement module transmission is received, and it is multiplied respectively With the same windowing coefficient searched in windowed function coefficients R OM table, windowing process is carried out, wherein the windowed function Rectangular window, quarter window, Hanning window, hamming window and Blackman window are specifically included, the windowed function is symmetric function, if The block length of FFT is M, and the M coefficient corresponding to windowed function is respectively F₁,F₂,…,F_M, then have F_i=F_M+1-i(i=1, 2 ..., M/2-1), M/2 windowing coefficient, windowed function coefficients R OM table size need to be only stored in the coefficients R OM table of windowed function Only need M/2；Then the two-way GNSS signal after the windowing processing module will be processed is sent to the FFT computing module.

S302, the input of real part all the way in the two-way GNSS signal Jing Guo windowing process is subjected to FFT calculating, another way is empty Portion's input carries out FFT calculating, and the plural FFT signal being calculated is carried out separation, two-way real number FFT signal is calculated, will Two-way GNSS signal is transformed into frequency domain data from time domain data.

S303, it will be filtered by the two-way frequency domain GNSS signal that FFT is calculated, and by the two-way through being filtered The input of real part all the way in frequency domain GNSS signal carries out IFFT calculating, and the input of another way imaginary part carries out IFFT calculating, and will calculate Obtained plural IFFT signal carries out separation and two-way real number IFFT signal is calculated.

Specifically, the NBI filtering processing module is filtered place to the two-way frequency domain GNSS signal calculated by FFT Various filtering restrainable algorithms, such as Threshold detection method, K spectral line algorithm and intermediate value can be used in reason, the NBI filtering processing module Filter method etc., wherein when the GNSS signal of input is unifrequency, the filtering parameter of the NBI filtering processing module is to set in advance It has been set that, the result of filtering processing is sent to the IFFT computing module by the NBI filtering processing module.

The IFFT computing module will pass through the GNSS signal real part all the way in the two-way frequency domain GNSS signal being filtered Input carries out IFFT calculating, and the input of another way GNSS signal imaginary part carries out IFFT calculating, and the plural IFFT being calculated is believed Two-way real number IFFT signal is calculated in number separation, and two-way GNSS signal is transformed into time domain data from frequency domain data, then will Calculated result is sent to the superposition processing module by the IFFT computing module.

Embodiment three, a kind of multifrequency GNSS signal Suppression of narrow band interference system.Below with reference to Fig. 1 and Fig. 3 to this implementation The system that example provides is described in detail.

Referring to Fig. 1 and Fig. 3, system provided in this embodiment includes single-frequency GNSS signal Suppression of narrow band interference device and extremely A few preprocessing module, at least one buffer process module, at least one buffer control module, Multiplexing module, demultiplexing mould Block and time-sharing multiplex control module.

The preprocessing module, including format conversion unit and detecting signal unit, it is untreated for receiving GNSS signal, the format conversion unit convert different bit wides and the GNSS signal of different coding format under RF clock domain For identical bit wide and coded format, the GNSS signal after the detecting signal unit converts format carries out interference signal inspection It surveys, whether needs to carry out Suppression of narrow band interference processing with the determination GNSS signal, and passage interference is generated according to definitive result Inhibition makes to can control signal and is sent to the buffer control module, and the GNSS signal after will test is exported to described slow Deposit processing module；The GNSS signal output for being also used to return to the buffer process module, to carry out subsequent despreading processing.

The buffer process module, for the GNSS signal after the write-in interferer signal detection under RF clock domain, then The GNSS signal is read under the control of the buffer control module, and whether is needed to carry out narrowband interference according to GNSS signal Inhibit the determination of processing as a result, the GNSS signal of reading to be returned to the preprocessing module output being correspondingly connected with or is sent To the Postponement module and the Multiplexing module being correspondingly connected with.

The buffer control module, for sending the channel to the time-sharing multiplex control module under system clock domain AF panel makes to can control signal and data cached ready transport indicator, and receives the time-sharing multiplex control module feedback Channel caching reads enable signal, and then controls the buffer process module work.

Specifically, the buffer process module uses size for the dual-port SRAM (Static of 2 fft block length Random Access Memory, Static RAM) to carry out ping-pong operation；The buffer process module is in RF clock domain GNSS signal after lower write-in pretreatment, the caching reads enable signal control institute to the buffer control module based on the received It states buffer process module and reads GNSS signal: if the caching reads enable signal and shows not needing to do GNSS signal progress narrowband Inhibition is disturbed, the buffer process module sequentially reads current GNSS signal under RF clock domain, and returns to the institute being correspondingly connected with State preprocessing module output；It demonstrates the need for carrying out Suppression of narrow band interference to GNSS signal if the caching reads enable signal, is being It unites under clock domain, sequentially reads current GNSS signal according to FFT butterfly computation, and be sent to the Postponement module being correspondingly connected with And the Multiplexing module；The buffer process module is while reading current GNSS signal, after continuing under RF clock domain Enter it is next it is preprocessed after GNSS signal, realize ping-pong operation；In addition, the buffer process module is described current Before GNSS signal write-in, previous RF clock is mentioned by handling simultaneously before current GNSS signal by the superposition processing module The GNSS signal of return is read, and returns to the preprocessing module output being correspondingly connected with.

The Postponement module is identical with the Postponement module in the single-frequency GNSS signal Suppression of narrow band interference device, uses In by received GNSS signal postpone M/2 sampled point, and by after delay GNSS signal output.

The Multiplexing module, the multichannel demultiplex control signal for being sent according to the time-sharing multiplex control module will The GNSS signal for undelayed multiple frequencies that successively received multiple buffer process modules are sent and multiple described prolong The GNSS signal of the multiple frequencies for the delay that slow module is sent is integrated into a channel, and according to the difference of frequency, at times The identical delay of frequency and undelayed two-way GNSS signal are successively sent to the windowing processing module.

The windowing processing module and the windowing processing module in the single-frequency GNSS signal Suppression of narrow band interference device are complete It is exactly the same, believe for receiving the GNSS signal and undelayed GNSS signal of M/2 sampled point of delay, and to two-way time domain GNSS Number windowing process is carried out respectively；The windowing processing module time-sharing multiplex carries out at adding window the two-way GNSS signal of multiple frequencies Reason.

Wherein, current GNSS signal is sequentially read according to FFT butterfly computation due to the buffer process module, it is described Postponement module and windowing processing module are handled the GNSS signal according to FFT butterfly computation sequence, if described slow Depositing processing module and the sequence of M data sampled point is written under RF clock domain is respectively D₀、D₁、D₂、…、D_M-1, then in system The sequence read under clock domain is D₀、D_M/2、D₁、D_M/2+1、D₂、D_M/2+2、…、D_M/2-1、D_M-1, and then the windowing processing module from The sequence that corresponding M windowing coefficient is read in windowed function ROM table is F₀、F_M/2、F₁、F_M/2+1、F₂、F_M/2+2、…、F_M/2-1、 F_M-1, only M/2 windowing coefficient need to be stored in windowed function coefficients R OM table, and windowed function coefficients R OM table size only needs M/2.

The buffer process module sequentially reads GNSS signal by FFT butterfly computation, and the Postponement module and adds Window processing module is handled all in accordance with FFT butterfly computation sequence, " bit reversed order " processing before FFT computing module is removed, altogether Save M data storage cell (saving M/2 data storage cell per GNSS signal all the way).

The FFT computing module and the FFT computing module in the single-frequency GNSS signal Suppression of narrow band interference device are complete It is identical, for the real part input progress FFT calculating all the way of the two-way GNSS signal Jing Guo windowing process, imaginary part input all the way to be carried out FFT is calculated, and the plural FFT signal being calculated is carried out isolated two-way real number FFT signal, by two-way GNSS signal from Time domain data is transformed into frequency domain data；The FFT computing module time-sharing multiplex carries out FFT meter to the two paths of signals of multiple frequencies It calculates.

NBI in the NBI filtering processing module and the single-frequency GNSS signal Suppression of narrow band interference device is filtered Module is identical, for being filtered to the two-way frequency domain GNSS signal calculated by FFT；The NBI filtering processing Array signal processing is filtered the two paths of signals of multiple frequencies, and receives what the time-sharing multiplex control module was sent Filtering parameter is configured for the channel NBI filtering configuration signal of different frequency GNSS signal, and then guarantees different frequency The independence of GNSS signal filtering.

The IFFT computing module and the IFFT computing module in the single-frequency GNSS signal Suppression of narrow band interference device are complete Exactly the same, for the two-way frequency domain GNSS signal to process filtering processing, real part input carries out IFFT calculating all the way, all the way imaginary part Input carries out IFFT calculating, and the plural IFFT signal being calculated is carried out isolated two-way real number IFFT signal, by two Road GNSS signal is transformed into time domain data from frequency domain data, then outputs it；The IFFT computing module time-sharing multiplex is to more The two paths of signals of a frequency carries out IFFT calculating.

The superposition processing module and the superposition processing module in the single-frequency GNSS signal Suppression of narrow band interference device are complete It is exactly the same, for being overlapped processing to received two-way time domain GNSS signal, time domain GNSS signal all the way is obtained, and its is defeated Out to the buffer process module.

The demultiplexing module, the multichannel demultiplexing control letter for being sent according to the time-sharing multiplex control module Number, the GNSS signal of the multiple different frequencies comprising two paths of signals in a channel received at times is solved Multiplexing, is in multiple two-way GNSS signals in multiple channels according to the difference of frequency, and be sent respectively to multiple superpositions Processing module.

The time-sharing multiplex control module makes for receiving the passage interference inhibition that the buffer control module is sent It can control signal and the data cached ready transport indicator, then feed back the channel to the buffer control module and cache Read enable signal；For to the Multiplexing module send the multichannel demultiplex control signal control the Multiplexing module work with And signal is configured to NBI filtering processing module sendaisle NBI filtering；For receiving the IFFT of IFFT computing module transmission Indication signal is completed, and multichannel demultiplexing control signal control is sent to the demultiplexing module according to the completion indication signal Make the demultiplexing module work.

In addition, the time-sharing multiplex control module, is also used to all not need in all GNSS signals to carry out narrowband interference When inhibition, control all Postponement modules, all superposition processing modules, Multiplexing module, adding window module, FFT computing module, NBI is filtered module, IFFT computing module and demultiplexing module and all closes, to reduce the power consumption of system.

In addition, the time-sharing multiplex control module adjusts system when the frequency number of the GNSS signal actually accessed is K Clock frequency is K+1 times of RF clock frequency, if the time that RF clock domain inputs M sample point data in this way is T, in system M sample point data time is read in clock domain only needs T/ (K+1).

The GNSS signal of N number of different frequency is successively in the Postponement module, windowing processing module, FFT computing module, NBI It is fixed that total time needed for handling in module and IFFT computing module, which is filtered, for example, setting GNSS signal in a RF It is T the time required under clock domain, the GNSS signal of N number of different frequency is postponed M/2 under system clock domain by the Postponement module It is T/2 (N+1) GNSS signal of N number of different frequency and the GNSS signal for postponing M/2 sampled point the time required to a sampled point It is N*T/ (N+1), institute that total time needed for module is successively handled is filtered from windowing processing module to NBI under system clock domain It is about (2N+1) * T/2 (N+1) with total processing time.

It is particularly applicable to the narrowbands of the GNSS signal of 2 to 5 frequencies for the multifrequency GNSS signal Suppression of narrow band interference system AF panel, the system that multifrequency GNSS signal Suppression of narrow band interference system shown in Fig. 3 is N value when being 3.

Example IV, a kind of multifrequency GNSS signal narrow-band interference rejection method.Below with reference to Fig. 1 to Fig. 4 to the present embodiment The method of offer is described in detail.

Referring to Fig. 1 to Fig. 4, S401, N number of preprocessing module are under RF clock domain, to received N number of GNSS signal point It is not pre-processed, and the GNSS signal after pretreatment is exported to the N number of buffer process module being correspondingly connected with, simultaneously It passage interference inhibition also is made to can control signal respectively by N number of buffer control module is sent to the time-sharing multiplex and control Module.

Specifically, N number of format conversion unit in N number of preprocessing module is respectively to received N under RF clock domain A untreated GNSS signal formats, and the GNSS signal of different bit wides and different coding format is converted to The GNSS signal of identical bit wide and coded format, N number of detecting signal unit carry out interference letter to the GNSS signal after conversion Number detection, it is determined whether need to carry out Suppression of narrow band interference to the GNSS signal, it is dry then to generate channel according to definitive result Disturbing inhibition makes to can control signal, and makes passage interference inhibition by N number of buffer control module to can control signal hair respectively The time-sharing multiplex control module is given, while the GNSS signal after also will test is exported at the caching being correspondingly connected with Manage module, wherein the value range of N is 2 to 5.

S402, N number of buffer process module is distinguished in the case where writing address successively differs M/4 under RF clock domain N number of GNSS signal is written, successively write it is full after, corresponding N number of buffer control module successively send it is data cached just Thread indication signal gives the time-sharing multiplex control module；The time-sharing multiplex control module is according to the data cached ready instruction Signal and the passage interference inhibition received before make to can control signal, and generation channel caching reading enable signal is simultaneously successively anti- It feeds N number of buffer control module.

Specifically, the GNSS signal after pretreatment, write-in ground is written in N number of buffer process module under RF clock domain Location successively differs M/4, and first buffer process module is written since writing address 0, when writing M/4 sampled point, Second buffer process module is just written since writing address 0；When first buffer process module writes M/2 Sampled point, when second buffer process module writes M/4 sampled point, the third buffer process module is just from write-in Address 0 starts to be written, and so on to buffer process module described in n-th；It is subsequent not stop to be written, each caching process mould The writing address of block constantly adds 1, writes Man Houjun in writing address and can reset and restarts to count；Guarantee N number of caching in this way The data cached indication signal that processing module generates after writing completely is just staggered M/4 RF clock domain time, and successively writing expires it Afterwards, corresponding N number of buffer control module successively sends the data cached ready transport indicator to the time-sharing multiplex Control module.

The time-sharing multiplex control module is according to received in the data cached ready transport indicator and step S401 The corresponding passage interference inhibition makes to can control signal, generates the channel for whether carrying out Suppression of narrow band interference to GNSS signal and delays Reading enable signal is deposited, and is successively sent to N number of buffer control module.

S403, N number of buffer control module read enable signal according to the caching and control N number of caching process respectively Module reads N number of GNSS signal, if not needing to carry out Suppression of narrow band interference to GNSS signal, GNSS signal is returned to corresponding company The preprocessing module connect is exported to carry out subsequent despreading processing, terminates the inhibition process of current GNSS signal；If desired right GNSS signal carries out Suppression of narrow band interference, and GNSS signal is sent to the Postponement module being correspondingly connected with and the multiplexing mould Block.

It is controlled at N number of caching specifically, N number of buffer control module successively reads enable signal according to the caching Reason module reads N number of GNSS signal: if the caching reads enable signal and shows not needing to carry out GNSS signal narrowband interference suppression System, the buffer process module sequentially reads current GNSS signal under RF clock domain, and be sent to be correspondingly connected with it is described pre- Processing module, the preprocessing module, which is output it, carries out subsequent despreading processing, terminates the inhibition process of current GNSS signal；If The caching reads enable signal and demonstrates the need for carrying out Suppression of narrow band interference to GNSS signal, and the buffer process module is in system Under clock domain, sequentially read current GNSS signal according to FFT butterfly computation, and be sent to the Postponement module being correspondingly connected with and The Multiplexing module；The buffer process module is while reading current GNSS signal, under continuing to write under RF clock domain One it is preprocessed after GNSS signal, realize ping-pong operation.

S404, N number of Postponement module are under system clock domain, successively respectively by received GNSS signal delay M/2 Sampled point, and the GNSS signal after delay is sent to the Multiplexing module, the Multiplexing module is according to the time-sharing multiplex control The multichannel demultiplex control signal that molding block is sent does not postpone the GNSS signal of N number of frequency of received delay and successively The GNSS signal of N number of frequency be integrated into a channel, and successively to send frequency at times identical according to frequency different Delay and undelayed two-way GNSS signal give the windowing processing module, and what it is until N number of different frequency includes two paths of signals GNSS signal be all sent to the windowing processing module.

Specifically, N number of Postponement module is under system clock domain successively respectively by received GNSS signal delay M/2 Sampled point, and the GNSS signal after delay is exported to the Multiplexing module, the Multiplexing module is according to the time-sharing multiplex control The multichannel demultiplex control signal that molding block is sent does not postpone the GNSS signal of N number of frequency of received delay and successively The GNSS signal of N number of frequency be integrated into a channel, wherein the GNSS signal of each frequency includes delay and does not postpone Two paths of signals successively send the identical delay of frequency and undelayed two-way GNSS at times and according to the difference of frequency Signal gives the windowing processing module, until the GNSS signal comprising two paths of signals of N number of different frequency is all sent to institute State windowing processing module.

S405, the windowing processing module and FFT computing module are successively to received delay and undelayed two-way GNSS signal carries out windowing process and FFT calculation processing, and obtained calculated result is sent to the NBI, mould is filtered Block, the channel NBI filtering configuration signal that the NBI filtering processing module is sent according to the time-sharing multiplex control module is to filtering Parameter is configured, and then is filtered to two-way GNSS signal, and filter result is sent to the IFFT and calculates mould Block, the IFFT computing module carries out IFFT calculating to two-way GNSS signal, and the two-way GNSS signal after calculating is sent To the demultiplexing module, while IFFT is sent to the time-sharing multiplex control module and completes indication signal, the time-sharing multiplex Control module sends multichannel demultiplexing control signal to the demultiplexing control module according to the completion indication signal.

Specifically, the windowing processing module is reused at times, to the GNSS signal of N number of frequency at times respectively into Row windowing process, in processing, to successively received delay and undelayed two-way GNSS signal respectively multiplied by adding window letter The same windowing coefficient searched in number system number ROM table carries out windowing process, wherein the windowed function specifically includes square Shape window, quarter window, Hanning window, hamming window and Blackman window, the windowed function are symmetric function.

Wherein, current GNSS signal is sequentially read according to FFT butterfly computation due to the buffer process module, so described Postponement module and windowing processing module are handled according to FFT butterfly computation sequence, if the buffer process module is in RF It is respectively D that the sequence of M data sampled point is written under clock domain₀、D₁、D₂、…、D_M-1, then read under system clock domain Sequence is D₀、D_M/2、D₁、D_M/2+1、D₂、D_M/2+2、…、D_M/2-1、D_M-1, and then the windowing processing module is from windowed function ROM table The middle sequence for reading corresponding M windowing coefficient is F₀、F_M/2、F₁、F_M/2+1、F₂、F_M/2+2、…、F_M/2-1、F_M-1, windowed function system M/2 windowing coefficient only need to be stored in number ROM table, windowed function coefficients R OM table size only needs M/2.

The result of windowing process is sent to the FFT computing module, the FFT computing module by the windowing processing module It reuses at times, FFT calculation processing is carried out respectively at times to the GNSS signal of N number of frequency, specifically, the FFT is counted It calculates module and the real part of the GNSS signal all the way input in the two-way GNSS signal Jing Guo windowing process is subjected to FFT calculating, another way The input of GNSS signal imaginary part carries out FFT calculating, and the plural FFT signal being calculated is carried out isolated two-way real number FFT Two-way GNSS signal is transformed into frequency domain data from time domain data, realizes FFT computing module about two-way GNSS signal by signal Shared multiplexing, and obtained calculated result is sent to the NBI, module is filtered.

The NBI filtering processing module is reused at times, is directed to N according to what the time-sharing multiplex control module was sent The channel NBI filtering configuration signal of a different frequency GNSS signal configures filtering parameter, N number of to calculating by FFT The two-way frequency domain GNSS signal of different frequency is filtered at times, and various filters can be used in the NBI filtering processing module Wave restrainable algorithms, such as Threshold detection method, K spectral line algorithm and median filtering method etc., the NBI filtering processing module will filter The result of processing is sent to the IFFT computing module.

The IFFT computing module is reused at times, carries out IFFT respectively at times to the GNSS signal of N number of frequency Calculation processing, specifically, the IFFT computing module will pass through the GNSS signal all the way in the two-way GNSS signal being filtered Real part input carries out IFFT calculating, and the input of another way GNSS signal imaginary part carries out IFFT calculating, and the plural number that will be calculated IFFT signal carries out isolated two-way real number IFFT signal, and two-way GNSS signal is transformed into time domain data from frequency domain data, Then obtained calculated result is sent to the demultiplexing module, while also sends IFFT to the time-sharing multiplex control module Indication signal is completed, the time-sharing multiplex control module is sent according to the completion indication signal to the demultiplexing control module Multichannel demultiplexing control signal.

Specifically, the multichannel demultiplexing control that the demultiplexing module is sent according to the time-sharing multiplex control module Signal processed solves the GNSS signal comprising two paths of signals of the N number of frequency in a channel received at times Multiplexing, is in N number of two-way GNSS signal in N number of channel according to the difference of frequency, and be sent respectively to the N number of institute being correspondingly connected with Superposition processing module is stated, received two-way time domain GNSS signal is overlapped processing respectively, obtained by N number of superposition processing module To time domain GNSS signal all the way, and the N number of buffer process module being correspondingly connected with, N number of caching process are returned to respectively The GNSS signal reading of N number of frequency is returned to the corresponding preprocessing module respectively by module, wherein the caching process mould Block is to mention previous RF clock before next GNSS signal is written in the buffer process module, reads superimposed processing GNSS signal afterwards；N number of preprocessing module respectively exports the GNSS signal of N number of frequency, to carry out subsequent despreading processing.

In addition, when the GNSS signal of all frequencies does not all need to carry out Suppression of narrow band interference, the time-sharing multiplex control Module controls all Postponement modules, all superposition processing modules, Multiplexing module, adding window module, FFT computing module, NBI filter Wave processing module, IFFT computing module and demultiplexing module are all closed.

When the frequency number of the GNSS signal actually accessed is K, the time-sharing multiplex control module adjusts system clock Frequency is K+1 times of RF clock frequency, if the time that RF clock domain inputs M sample point data in this way is T, in system clock domain The M sample point data time of interior reading only needs T/ (K+1).

The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.

Claims

1. a kind of single-frequency GNSS signal Suppression of narrow band interference device, which is characterized in that described device includes Postponement module, at adding window Manage module, FFT computing module, NBI filtering processing module, IFFT computing module and superposition processing module；

The Postponement module for receiving GNSS signal all the way, and is postponed M/2 sampled point and is exported to the windowing process Module, wherein M is fft block length, specially 2 exponential depth；

The windowing processing module, for receiving delay M/2 sampling of GNSS signal all the way and Postponement module transmission The GNSS signal of point, and windowing process is carried out respectively to two-way time domain GNSS signal；

The FFT computing module, including real part input are inputted with imaginary part, for in the two-way GNSS signal Jing Guo windowing process The input of real part all the way carry out FFT calculating, the input of another way imaginary part carries out FFT calculating, and the plural FFT signal that will be calculated It carries out separation and two-way real number FFT signal is calculated；

The IFFT computing module, including real part input are inputted with imaginary part, for the two-way frequency domain GNSS by filtering processing The input of real part all the way in signal carries out IFFT calculating, and the input of another way imaginary part carries out IFFT calculating, and answers what is be calculated Number IFFT signal carries out separation and two-way real number IFFT signal is calculated, and outputs it；

The superposition processing module obtains time domain all the way for being overlapped processing to received two-way time domain GNSS signal GNSS signal, and output it.

2. a kind of single-frequency GNSS signal Suppression of narrow band interference device as described in claim 1, which is characterized in that at the adding window Reason module is specifically used for:

Receive the GNSS signal for the M/2 sampled point of delay that GNSS signal and the Postponement module all the way are sent, and by two-way Time domain GNSS signal multiplied by the same windowing coefficient searched in the coefficients R OM table of windowed function, carries out at adding window respectively Reason；

The windowed function specifically includes rectangular window, quarter window, Hanning window, hamming window and Blackman window, the adding window letter Number is symmetric function, if the block length of FFT is M, the M coefficient corresponding to windowed function is respectively F₁,F₂,…,F_M, then have F_i=F_M+1-i(i=1,2 ..., M/2-1) need to only store M/2 windowing coefficient in windowed function coefficients R OM table.

3. a kind of multifrequency GNSS signal Suppression of narrow band interference system, which is characterized in that the system comprises claims 1 or 2 institutes The single-frequency GNSS signal Suppression of narrow band interference device stated and at least one preprocessing module, at least one buffer process module, At least one buffer control module, Multiplexing module, demultiplexing module and time-sharing multiplex control module；

The preprocessing module, including format conversion unit and detecting signal unit, under RF clock domain to receiving GNSS signal format, and to format conversion after GNSS signal carry out interferer signal detection, described in determination Whether GNSS signal needs to carry out Suppression of narrow band interference processing, and generates passage interference according to definitive result and inhibit to make to can control letter Number and the GNSS signal after being sent to the buffer control module and will test export to the buffer process module；Also use In the GNSS signal output for returning to the buffer process module, to carry out subsequent despreading processing；

The buffer process module, for the GNSS signal after the write-in interferer signal detection under RF clock domain, then in institute It states and reads the GNSS signal under the control of buffer control module, and whether needed to carry out Suppression of narrow band interference according to GNSS signal The GNSS signal of reading as a result, is returned to the preprocessing module output being correspondingly connected with or is sent to pair by the determination of processing The Postponement module and the Multiplexing module that should be connected；

The buffer control module, for sending the passage interference to the time-sharing multiplex control module under system clock domain Inhibition makes to can control signal and data cached ready transport indicator, and receives the channel of the time-sharing multiplex control module feedback Caching reads enable signal, and then controls the buffer process module work；

The Multiplexing module, the multichannel demultiplex control signal for being sent according to the time-sharing multiplex control module, will successively The GNSS signal for undelayed multiple frequencies that received multiple buffer process modules are sent and multiple delay moulds The GNSS signal of the multiple frequencies for the delay that block is sent is integrated into a channel, and according to the difference of frequency, at times successively The identical delay of frequency and undelayed two-way GNSS signal are sent to the windowing processing module；

The demultiplexing module, the multichannel demultiplexing control signal for being sent according to the time-sharing multiplex control module are right The GNSS signal of the multiple different frequencies comprising two paths of signals being in a channel received at times is demultiplexed, and is made Multiple two-way GNSS signals are in multiple channels according to the difference of frequency, and are sent respectively to multiple superposition processing moulds Block.

4. a kind of multifrequency GNSS signal Suppression of narrow band interference system as claimed in claim 3, which is characterized in that at the caching Reason module is specifically used for:

The GNSS signal after interferer signal detection is written under RF clock domain, and is believed according to the control of the buffer control module It number reads current GNSS signal: when not needing to carry out Suppression of narrow band interference to GNSS signal, being sequentially read under RF clock domain GNSS signal simultaneously returns to the preprocessing module output being correspondingly connected with；It is needing to carry out Suppression of narrow band interference to GNSS signal When, GNSS signal is sequentially read according to FFT butterfly computation under system clock domain and is sent to the delay mould being correspondingly connected with Block and the Multiplexing module；While reading current GNSS signal, continued to write under RF clock domain next through interfering GNSS signal after signal detection realizes ping-pong operation.

5. a kind of multifrequency GNSS signal Suppression of narrow band interference system as claimed in claim 3, which is characterized in that the timesharing is multiple With control module, for when all GNSS signals all do not need to carry out Suppression of narrow band interference, control all Postponement modules, All superposition processing module, Multiplexing module, windowing processing module, FFT computing module, NBI filtering processing module, IFFT are calculated Module and demultiplexing module are all closed；And for the frequency number in the GNSS signal actually accessed be K when, adjustment system Clock frequency of uniting is K+1 times of RF clock frequency, and wherein K is positive integer.

6. a kind of single-frequency GNSS signal narrow-band interference rejection method, which is characterized in that the described method includes:

S301, unifrequent time domain GNSS signal is divided into two-way, wherein M/2 sampled point of signal delay all the way, another way letter Number do not postpone, and after delay and undelayed two-way GNSS signal is subjected to windowing process respectively；

S302, the input of real part all the way in the two-way GNSS signal Jing Guo windowing process is subjected to FFT calculating, another way imaginary part is defeated Enter and carry out FFT calculating, and the plural FFT signal being calculated is subjected to separation, two-way real number FFT signal is calculated；

S303, it will be filtered by the two-way frequency domain GNSS signal that FFT is calculated, and by the two-way frequency domain through being filtered The input of real part all the way in GNSS signal carries out IFFT calculating, and the input of another way imaginary part carries out IFFT calculating, and will be calculated Plural IFFT signal carry out separation two-way real number IFFT signal is calculated；

S304, the two-way time domain GNSS signal calculated by IFFT is overlapped processing, obtains time domain GNSS signal all the way, with Carry out subsequent despreading processing.

7. a kind of single-frequency GNSS signal narrow-band interference rejection method as claimed in claim 6, which is characterized in that in the S301 It is described to specifically include the progress windowing process of two-way GNSS signal:

It will postpone M/2 sampled point GNSS signal and undelayed GNSS signal, respectively multiplied by windowed function coefficients R OM The same windowing coefficient searched in table carries out windowing process；

8. a kind of multifrequency GNSS signal narrow-band interference rejection method, which is characterized in that the described method includes:

S401, N number of preprocessing module pre-process received N number of GNSS signal under RF clock domain respectively, and will GNSS signal after pretreatment is exported to the N number of buffer process module being correspondingly connected with, while also passing through N number of caching Control module makes the passage interference inhibition can control signal respectively is sent to the time-sharing multiplex control module；

S402, N number of buffer process module is respectively written into the case where writing address successively differs M/4 under RF clock domain N number of GNSS signal, after successively writing completely, corresponding N number of buffer control module successively sends data cached ready finger Show signal to the time-sharing multiplex control module；The time-sharing multiplex control module is according to the data cached ready transport indicator And the passage interference inhibition received before makes to can control signal, generates channel caching and reads enable signal and successively feed back to N number of buffer control module；

S403, N number of buffer control module read enable signal according to the caching and control N number of buffer process module respectively N number of GNSS signal is read, if not needing to carry out Suppression of narrow band interference to GNSS signal, GNSS signal is returned to and is correspondingly connected with The preprocessing module output terminates the inhibition process of current GNSS signal to carry out subsequent despreading processing；If desired to GNSS Signal carries out Suppression of narrow band interference, and GNSS signal is sent to the Postponement module and the Multiplexing module being correspondingly connected with；

Received GNSS signal is successively postponed M/2 sampling respectively under system clock domain by S404, N number of Postponement module Point, and the GNSS signal after delay is sent to the Multiplexing module, the Multiplexing module controls mould according to the time-sharing multiplex The multichannel demultiplex control signal that block is sent, successively by the GNSS signal of N number of frequency of received delay and undelayed N number of The GNSS signal of frequency is integrated into a channel, and according to frequency it is different successively send at times the identical delay of frequency with And undelayed two-way GNSS signal gives the windowing processing module, until the GNSS comprising two paths of signals of N number of different frequency Signal is all sent to the windowing processing module；

S405, the windowing processing module and FFT computing module are successively to received delay and undelayed two-way GNSS Signal carries out windowing process and FFT calculation processing, and obtained calculated result is sent to the NBI, module is filtered, The channel NBI filtering configuration signal that the NBI filtering processing module is sent according to the time-sharing multiplex control module joins filtering Number is configured, and then is filtered to two-way GNSS signal, and filter result is sent to the IFFT computing module, The IFFT computing module carries out IFFT calculating to two-way GNSS signal, and the two-way GNSS signal after calculating is sent to institute Demultiplexing module is stated, while sending IFFT to the time-sharing multiplex control module and completing indication signal, the time-sharing multiplex control Module sends multichannel demultiplexing control signal to the demultiplexing control module according to the completion indication signal；

S406, the demultiplexing module demultiplex control signal according to the multichannel, make N number of two-way GNSS received at times Signal is in N number of channel according to the difference of frequency, and is sent respectively to the N number of superposition processing module being correspondingly connected with, N number of Received two-way time domain GNSS signal is overlapped processing, and the time domain all the way that will be obtained respectively by the superposition processing module GNSS signal returns to the N number of buffer process module being correspondingly connected with and preprocessing module output respectively, subsequent to carry out Despreading processing.

9. a kind of multifrequency GNSS signal narrow-band interference rejection method as claimed in claim 8, which is characterized in that the step S403 is specifically included:

N number of buffer control module reads enable signal according to the caching and controls N number of buffer process module reading N respectively A current GNSS signal: when not needing to carry out Suppression of narrow band interference to GNSS signal, GNSS is sequentially read under RF clock domain Signal simultaneously returns to the preprocessing module output being correspondingly connected with；When needing to carry out Suppression of narrow band interference to GNSS signal, Under system clock domain according to FFT butterfly computation sequentially read the Postponement module that GNSS signal and being sent to is correspondingly connected with And the Multiplexing module；N number of buffer control module is while reading current GNSS signal, successively respectively in RF clock domain Under continue to write to it is next it is preprocessed after GNSS signal, realize ping-pong operation；

The delay disposal module and windowing processing module carry out received GNSS signal according to FFT butterfly computation sequence Processing.

10. a kind of multifrequency GNSS signal narrow-band interference rejection method as claimed in claim 8, which is characterized in that the method Further include:

When all GNSS signals all do not need to carry out Suppression of narrow band interference, the time-sharing multiplex control module controls all Mould is filtered in Postponement module, all superposition processing modules, Multiplexing module, windowing processing module, FFT computing module, NBI Block, IFFT computing module and demultiplexing module are all closed；

When the frequency number of the GNSS signal actually accessed is K, the time-sharing multiplex control module adjusts system clock frequency It is K+1 times of RF clock frequency, wherein K is positive integer.