CN101154983B - Implementing method for anti-interference technology of satellite communication based on single-time sampling - Google Patents
Implementing method for anti-interference technology of satellite communication based on single-time sampling Download PDFInfo
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- CN101154983B CN101154983B CN2006101165825A CN200610116582A CN101154983B CN 101154983 B CN101154983 B CN 101154983B CN 2006101165825 A CN2006101165825 A CN 2006101165825A CN 200610116582 A CN200610116582 A CN 200610116582A CN 101154983 B CN101154983 B CN 101154983B
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Abstract
The present invention relates to a number sampling basing on the single-time frequency spreading code speed and the correlative disturbance suppression and the signal tracking arithmetic. The data rate which needs be done with anti-interference is reduced to identical to the speed of the frequency spreading code with the number sampling of the single-time frequency spreading code speed, then doing frequency domain trapping using the frequency anti-interference arithmetic. The Hamming window is adapted in the time domain and the data overlap processing is adopted to reduce the effect of the time domain cutback. In the aspect of disturbance analyzing the data is divided to block and is done with selective analyzing to reduce the calculating amount and avid the calculation doubling caused bythe data overlap processing. The circulating iteration is adapted in the threshold estimating for the signal character effect which is caused by that the time varying interference acts on the analog front end. When the anti-interference is finished the time domain time-delay wave filter is adopted in order to do tracing of the frequency spreading signal, and the anti-interference data with a double frequency spreading code speed is obtained to do tracing of the frequency spreading code.
Description
Technical field:
The present invention relates to technical field of satellite communication, particularly a kind of implementation method of the anti-interference technology of satellite communication based on single-time sampling.
Background technology:
Current, satellite-signal is carried out digital sample, and carry out anti-interference process, be an important technology of satellite communication.Satellite communication is that three big communication networks domestic, that the world provides key circuit are transmitted one of infrastructure, and it can provide access service anywhere, and its flexibility is that the ground communication net is irreplaceable.Satellite repeater is the necessary channel of whole satellite communication network, and all signals all will be transmitted by transponder in the net; And the earth station that covers under the wave beam at it can both send signal to transponder, so it is subjected to the various influences of having a mind to or being not intended to disturb especially easily.
At present, in the Digital Signal Processing part,, two kinds of methods of time domain adaptive-filtering and frequency domain adaptive trap are arranged generally for anti-interference process.Time-domain adaptive filtering has the problem of high amount of calculation, convergence rate and stability, and the frequency domain adaptive trap then will solve complicated FFT and IFFT computing, and the spectrum leakage problem of being brought by the signal brachymemma.Simultaneously, at the particularity of spread spectrum communication, general employing doubles the data sampling rate of spread-spectrum code rate at least, and this has further increased amount of calculation and implementation complexity.
The algorithm of the above-mentioned high complexity of mentioning has caused its difficulty that realizes on low-power consumption miniaturization platform.At jamproof particular algorithm operand requirement in the satellite communication, need a kind of new algorithm of design, make it to be reduced in the scope that low-power consumption DSP can allow, can make the satellite receiving terminal of miniaturization have good interference free performance too.
Summary of the invention:
The implementation method that the purpose of this invention is to provide a kind of anti-interference technology of satellite communication based on single-time sampling.This method relates to single times of spread-spectrum code rate digital sample and associated interference inhibition and signal trace algorithm.By single times of spread-spectrum code rate digital sample, needs are carried out jamproof data transfer rate be reduced to identically with spread-spectrum code rate, adopt the anti-interference algorithm of frequency domain then, carry out the frequency domain trap.And after anti-interference process is finished, adopt time domain filtering wave by prolonging time device, obtain the anti-interference back data of double spread-spectrum code rate, to carry out frequency spreading tracking.
Technical problem to be solved by this invention comprises:
(1) in order to realize anti-interference process and to reduce consequent spectral leakage, the amount of calculation of algorithm is higher and be directly proportional with sampling rate, and the sampling rate of band spread receiver is at least the twice of spread-spectrum code rate usually to realize tracking, therefore needs to solve jamproof high operand problem.
(2) can not directly realize frequency spreading tracking based on the single-time sampling data, therefore need to solve the problem that realizes frequency spreading tracking based on the single-time sampling data.
The following technical scheme of the concrete employing of foregoing invention:
A kind of implementation method of the anti-interference technology of satellite communication based on single-time sampling is characterized in that this method comprises the steps:
(1) signal frequency conversion doubly carries out data sampling to the speed of spread-spectrum code rate to spread-spectrum signal with single to base band;
(2) the anti-interference iterative processing of piecemeal frequency domain that the single-time sampling data are out of shape;
(3) to the half chip Filtering Processing of delaying time through the data after the anti-interference process, obtain the double sampling speed data, carry out door computing sooner or later finishing frequency spreading tracking, replaced jamproof amount of calculation expense with the amount of calculation expense of filtering wave by prolonging time.
In addition, feature of the present invention also comprises:
The anti-interference iterative processing detailed process of the piecemeal frequency domain that in the step (2) the single-time sampling data is out of shape comprises carries out overlapping windowing process to signal, data block is divided into two groups, one group is carried out interference analysis and disturbs inhibition, another group utilizes the result of interference analysis directly to disturb inhibition, above-mentioned two groups of processing procedures are that synchronous interleaved is carried out in time, guaranteeing the real-time of interference analysis, and utilize the mode of loop iteration interference is discerned and to be restrained; Data after anti-interference are reconfigured.
Adopt delay filter to obtain double spread-spectrum code rate data after the anti-interference iterative processing of piecemeal frequency domain of in the above-mentioned steps (2) the single-time sampling data being out of shape.
According to the foregoing invention method, this technology can be applied to satellite communication system and other spread spectrum communication systems, particularly realizes having the satellite receiver of antijamming capability on low-power consumption DSP.
Advantage of the present invention:
(1) the inventive method is only carried out single-time sampling and is handled after digital signal down variable frequency, needs is carried out jamproof signal rate reduce to minimum.
Description of drawings:
(2) the related anti-interference algorithm of frequency domain among the present invention adopts 1/4DMA transmission length as FFT processing window length, and the interference nulling strategy utilizes time domain Hamming window to restrain spectrum leakage, and the processing gain loss that windowing causes is restrained in overlapping processing. The overlapping processing of traditional windowing is carried out overlapping windowing to all data, and amount of calculation doubles, and needs the data after reservation postpones, and tissue is complicated, is fit to flow the piece of processing and being not suitable for take DMA to the basis and processes. Realize that in order to be suitable for DSP reduce simultaneously amount of calculation, the present invention adopts the overlapping processing of simplification, so that anti-interference amount of calculation do not double for not overlapping processing, but 1.75 times.
(3) anti-interference algorithm of the present invention specifically is split into frequency domain interference analysis and frequency domain and disturbs and suppress two processes, so that further reduce anti-interference amount of calculation on the basis of performance not.
(4) the present invention adopts the method for loop iteration, reasonably disturbed the judgement thresholding, the variation that is used for overcoming owing to signal interference strength in the communication process causes signal amplitude to change the situation that frequency domain disturbs the thresholding of identification to change simultaneously that also further causes.
Embodiment:
Fig. 1 is the jamproof particular flow sheet of frequency domain of the present invention
Fig. 2 is the particular flow sheet of interference analysis in the inventive method
The particular flow sheet of Fig. 3 for carrying out the tracking of spread-spectrum signal in the inventive method
Specify the present invention below in conjunction with accompanying drawing.
The implementation method of a kind of anti-interference technology of satellite communication based on single-time sampling of the present invention, it relates to single times of spread-spectrum code rate digital sample and associated interference inhibition and signal trace algorithm.
Its cardinal principle is by single times of spread-spectrum code rate digital sample, needs is carried out jamproof data transfer rate be reduced to identically with spread-spectrum code rate, adopts the anti-interference algorithm of frequency domain then, carries out the frequency domain trap.In order to reduce the influence of time domain brachymemma, adopted the Hamming window on the time domain, and adopted the overlapping processing of data.The interference analysis aspect in order to reduce amount of calculation, is carried out piecemeal to data and is selected to analyze, and the amount of calculation of avoiding the overlapping processing of data to bring increases doubly.THRESHOLD ESTIMATION adopts loop iteration, becomes dry during with reply to disturb to act on the characteristics of signals influence that AFE (analog front end) causes.After anti-interference the finishing,, adopt time domain filtering wave by prolonging time device, obtain the anti-interference back data of double spread-spectrum code rate, to carry out frequency spreading tracking in order to carry out the tracking of spread-spectrum signal.
Make a general survey of currently, the spread spectrum communication system is generally adopted in satellite communication.Traditional spread spectrum communication is generally adopted the sampling rate of twice at least in order to carry out signal trace.The present invention only carries out single-time sampling and handles after Digital Down Convert, needs is carried out jamproof signal rate reduce to minimum.The present invention does not have specific (special) requirements to the system of satellite communication, can be common to spread spectrum communication system, especially to there being the low-power consumption applied environment of complicated disturbance situation, has application mode very flexibly.
As shown in Figure 1, the anti-interference algorithm of the above-mentioned frequency domain of mentioning is the effective means of restraining narrow band interference in the communication.Adopt 1/4DMA transmission length to handle length of window among the present invention as FFT, the interference nulling strategy, time domain Hamming window is restrained spectrum leakage, and the processing gain loss that windowing causes is restrained in overlapping processing.The overlapping processing of traditional windowing is carried out overlapping windowing to all data, and amount of calculation doubles, and needs to keep the data after postponing, and tissue is complicated, is fit to stream and handles and be not suitable for handling based on the piece of DMA.Realize that in order to be suitable for DSP reduce amount of calculation simultaneously, the present invention adopts the overlapping processing of simplification, makes anti-interference amount of calculation not double for not overlapping processing, but 1.75 times.
In addition, in order further to reduce anti-interference amount of calculation on the basis that does not reduce performance, on above-mentioned basis, the present invention further is split into anti-interference algorithm frequency domain interference analysis and frequency domain interference and suppresses two processes.As shown in Figure 1, the lap analysis result that directly utilizes former and later two adjacent interference analyses partly to obtain disturbs inhibition.
As shown in Figure 2, become when being, after AFE (analog front end),, become when the thresholding that frequency domain interference is discerned also is because the disturbed substantially control of simulation AGC becomes when the amplitude of signal is owing to interference intensity.The present invention adopts the method for loop iteration, each data sequence of carrying out interference analysis is carried out repeatedly loop iteration to eliminate singular value, wherein the judgement of singular value is depended in the system design the definition and the actual test data of interference signal, is finally reasonably disturbed decision threshold and disturbs baseband signal after suppressing.
As shown in Figure 3, finish anti-interference after, in order to carry out the tracking of spread-spectrum signal, the present invention adopts FIR filtering wave by prolonging time device that single doubly anti-interference back data are handled, and obtains half spread-spectrum code chip delayed data, thereby obtains twice spread-spectrum code rate data.Filter Design is based on following design principle: desirable delay filter has the corresponding and linear phase place of constant amplitude in full frequency band corresponding.After obtaining to postpone half chip data, do not need computing once more, only, just can obtain leading half chip data simultaneously by data shift.On this basis, adopt traditional door and second order digital phase-locked loop sooner or later, finish the tracking of spreading code.The error adjustment amount that obtains of aforementioned calculation feeds back to numerical frequency oscillator (NCO) the most at last, realizes the accurate adjustment of spread-spectrum code rate.
More than be one of several execution modes of the inventive method,, do not spend performing creative labour, on the basis of the foregoing description, can do multiple variation, can realize purpose of the present invention equally for those skilled in the art.But this variation obviously should be in the protection range of claims of the present invention.
Claims (2)
1. the implementation method based on the anti-interference technology of satellite communication of single-time sampling is characterized in that, this method comprises the steps:
(1) signal frequency conversion doubly carries out data sampling to the speed of spread-spectrum code rate to spread-spectrum signal with single to base band;
(2) the anti-interference iterative processing of piecemeal frequency domain that the single-time sampling data are out of shape, promptly signal is carried out overlapping windowing process, data block is divided into two groups, one group is carried out interference analysis and disturbs inhibition, another group utilizes the result of interference analysis directly to disturb inhibition, above-mentioned two groups of processing procedures are that synchronous interleaved is carried out in time, guaranteeing the real-time of interference analysis, and utilize the mode of loop iteration interference is discerned and to be restrained; Data after anti-interference are reconfigured;
(3) to the half chip Filtering Processing of delaying time through the data after the anti-interference process, obtain the double sampling speed data, carry out door computing sooner or later finishing frequency spreading tracking, replaced jamproof amount of calculation expense with the amount of calculation expense of filtering wave by prolonging time.
2. according to the implementation method of the anti-interference technology of satellite communication of claim 1, it is characterized in that the time-delay half chip Filtering Processing in the described step (3) adopts delay filter to obtain double spread-spectrum code rate data.
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| CN103199889B (en) * | 2013-03-11 | 2014-12-10 | 西北工业大学 | Field programmable gata array (FPGA) implementation method of iteration frequency domain anti-interference algorithm |
| CN105468622A (en) * | 2014-09-04 | 2016-04-06 | 上海尧博信息科技有限公司 | Anti-interference semantic encoding transmission method for patent search |
| CN112422150B (en) * | 2018-12-28 | 2022-04-15 | 长沙天仪空间科技研究院有限公司 | Base station |
| CN113454919B (en) * | 2018-12-28 | 2023-01-24 | 长沙天仪空间科技研究院有限公司 | Satellite communication system |
| CN111641421A (en) * | 2020-05-08 | 2020-09-08 | 北京遥感设备研究所 | High dynamic digital receiver narrow-band interference suppression system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4349916A (en) * | 1980-08-06 | 1982-09-14 | The United States Of America As Represented By The Secretary Of The Air Force | Adaptive interference tracker for suppression of narrow band interference |
| CN1200851A (en) * | 1995-10-24 | 1998-12-02 | 摩托罗拉公司 | Method and apparatus for interference suppression in spread spectrum signal |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4349916A (en) * | 1980-08-06 | 1982-09-14 | The United States Of America As Represented By The Secretary Of The Air Force | Adaptive interference tracker for suppression of narrow band interference |
| CN1200851A (en) * | 1995-10-24 | 1998-12-02 | 摩托罗拉公司 | Method and apparatus for interference suppression in spread spectrum signal |
Non-Patent Citations (3)
| Title |
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| Latrien Bucket et al.chip synchronization performance affected by non-ideal interpolation of bandlimited direct-sequence spread-spectrum signals.《Communications and Vehicular Technology in the Benelux, 1994. IEEE Second Symposiumon Digital Object Identifier》.1994,52-59. * |
| LatrienBucketetal.chipsynchronizationperformanceaffectedbynon-idealinterpolationofbandlimiteddirect-sequencespread-spectrumsignals.《CommunicationsandVehicularTechnologyintheBenelux 1994. IEEE Second Symposiumon Digital Object Identifier》.1994 |
| 蒋毅凯.CX_1_低轨小卫星地面手持终端扩频软件解调器的体系结构及关键算法研究.《中国优秀博硕士学位论文全文数据库（博士）信息科技辑》.2006,(第04期),全文. * |
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Assignee: Shanghai Guthrie Information Technology Co. Ltd. Assignor: Shanghai Engineering Center for Microsatellites Contract record no.: 2011310000236 Denomination of invention: Implementing method for anti-interference technology of satellite communication based on single-time sampling Granted publication date: 20110316 License type: Exclusive License Open date: 20080402 Record date: 20111206 |
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Granted publication date: 20110316 Termination date: 20170927 |