CN103064090A - Anti-interference method - Google Patents
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- CN103064090A CN103064090A CN2012105743957A CN201210574395A CN103064090A CN 103064090 A CN103064090 A CN 103064090A CN 2012105743957 A CN2012105743957 A CN 2012105743957A CN 201210574395 A CN201210574395 A CN 201210574395A CN 103064090 A CN103064090 A CN 103064090A
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Abstract
The invention discloses an anti-interference method. The anti-interference method particularly comprises the following steps: conducting frequency domain anti-interference processing to processed signals and then conducting space domain anti-interference processing to the processed signals. The frequency domain anti-interference processing is capable of restraining strong narrow-band interference. After the space domain anti-interference processing is conducted, broadband interference signals entering a receiver can be filtered. According to cascading frequency domain anti-interference and the space domain anti-interference, labor division of the frequency domain anti-interference and the space domain anti-interference are enabled to be clear, frequency domain trapped wave anti-interference is mainly used for restraining of narrow band interference, the number of interference entering the space domain anti-interference is reduced, the space domain anti-interference is enabled to be provided with more freedom degree to restrain the narrow band interference, and a good interference restraining effect is achieved.
Description
Technical field
The invention belongs to the Satellite Navigation Technique application, particularly a kind of associating territory anti-interference method of broadband, arrowband and the frequency sweep interference for suppressing satellite navigation receiver.
Background technology
Satellite navigation system is comprised of satellite, ground central station, user terminal three parts of on high middle operation.The major function of general satellite navigation system is location, time service, communication.
Because there is electromagnetic interference (EMI) in the satellite navigation receiver actual working environment, and the satellite that arrives ground is very faint, so satellite navigation receiver is easy to be subject to extraneous various types of interference, particularly artificial interference, cause the most at last the reduction of positioning precision of navigation system even can't work, even lose the ability of navigator fix.If give full play to the effect of satellite navigation system in the Future Information war, just must strengthen the antijamming capability of satellite navigation receiver, therefore be necessary to design a kind of well behaved satellite navigation receiver Anti jamming Scheme.
Existing GLONASS (Global Navigation Satellite System) (Global Navigation Satellite System, GNSS) receiver Anti-Jamming Technique can be divided into by different territories four classes: time domain Anti-Jamming Technique, frequency domain Anti-Jamming Technique, spatial domain Anti-Jamming Technique, associating territory Anti-Jamming Technique.Anti-Jamming Technique is the study hotspot of present GNSS receiver Anti-Jamming Technique during empty in the Anti-Jamming Technique of associating territory.
Time domain and frequency domain filtering are very poor to the inhibition of broadband interference; The spatial domain Anti-Jamming Technique can suppress broadband interference effectively, but it to undesired signal come to the coming to certain requirement is arranged of GNSS signal; Anti-Jamming Technique has higher degree of freedom than simple spatial domain Anti-Jamming Technique when empty, but its algorithm is complicated, is difficult for Project Realization, and the same with simple spatial domain Anti-Jamming Technique, to undesired signal come to the GNSS signal to certain requirement is arranged.
Summary of the invention
The objective of the invention is the problems referred to above for present satellite navigation receiver Anti-Jamming Technique existence, a kind of associating territory anti-interference method for satellite navigation receiver of research and design can effectively suppress broadband, arrowband and frequency sweep and disturb.
Technical scheme of the present invention is: a kind of anti-interference method specifically comprises the steps:
The signal of each bay output of satellite navigation receiver radio-frequency front-end is divided into two-way, is designated as: first via signal and the second road signal; First via signal is processed through windowing process, 1/2 delay disposal and the laggard line frequency of Fourier transform territory anti-interference process successively; The the second road signal is processed through the laggard line frequency of 1/2 delay disposal, windowing process and Fourier transform territory anti-interference process successively; After will carrying out respectively doing overlapping processing behind the inverse fourier transform through the first via signal after the frequency domain anti-interference process and the second road signal, the signal after the overlapping processing be through the output data after the frequency domain anti-interference process;
The output data through after the frequency domain anti-interference process of a plurality of bay outputs are input to respectively in the corresponding spatial filter, and the data with each spatial filter output are weighted processing again, namely finish the spatial domain anti-interference process.
Beneficial effect of the present invention: after the signal after anti-interference method of the present invention will be processed passed through first the frequency domain anti-interference process, the signal after will processing again was through the spatial domain anti-interference process.The frequency domain anti-interference process can suppress strong arrowband to be disturbed, and again through after the anti-interference process of spatial domain, can will enter the filtering of the wideband interferer signal of receiver.Anti-interference method of the present invention is anti-interference anti-interference with the spatial domain by cascade connection frequency domain, so that frequency domain is anti-interference and the jamproof division of labor in spatial domain is clear and definite, the frequency domain trap is anti-interference to be mainly used in suppressing the arrowband and to disturb, reduce and enter the jamproof interference number in spatial domain, so that the spatial domain immunity module has more degree of freedom to suppress broadband interference, reach a kind of preferably interference suppressioning effect; And whole method can be integrated among the FPGA and realize, is conducive to the Miniaturization Design of receiver.
Description of drawings
Fig. 1 is the system chart of satellite navigation receiver;
Fig. 2 is the schematic diagram of the frequency domain anti-interference process of satellite navigation receiver;
Fig. 3 is the schematic diagram of the spatial domain anti-interference process of satellite navigation receiver;
Fig. 4 is the schematic diagram of the satellite navigation receiver anti-interference method of embodiment.
Embodiment
Accompanying drawing discloses the schematic diagram of system chart of the present invention and a kind of specific embodiments without limitation, and the invention will be further described below in conjunction with accompanying drawing.
Fig. 1 has provided the system chart of satellite navigation receiver, and the immunity module of satellite navigation receiver is placed on after the radio-frequency module, after radio-frequency module is down-converted to base band to navigation signal, is processed by immunity module again, disturbs inhibition.Immunity module is specifically finished anti-interference method proposed by the invention.
Satellite navigation receiver anti-interference method of the present invention specifically comprises the steps: the signal of each bay output of satellite navigation receiver radio-frequency front-end is divided into two-way, is designated as: first via signal and the second road signal; First via signal is processed through windowing process, 1/2 delay disposal and the laggard line frequency of Fourier transform territory anti-interference process successively; The the second road signal is processed through the laggard line frequency of 1/2 delay disposal, windowing process and Fourier transform territory anti-interference process successively; After will carrying out respectively doing overlapping processing behind the inverse fourier transform through the first via signal after the frequency domain trap anti-interference process and the second road signal, the signal after the overlapping processing be through the output data after the frequency domain trap anti-interference process; The output data through after the frequency domain trap anti-interference process of a plurality of each bay output are input to respectively in the corresponding spatial filter, and the data that each spatial filter is exported are weighted processing, namely finish the spatial domain anti-interference process.
Fig. 2 has provided the jamproof schematic diagram of frequency domain, the anti-interference part of frequency domain in the present embodiment adopts the mode of two paths of signals stack to export, reduce the distortion of signal, windowing process is to prevent FFT(Fast Fourier Transformation), the spectral leakage of processing, the frequency domain anti-interference process is processed according to the spectral line of FFT output, finishes Suppression of narrow band interference.
This two aspects factor that considers that spectral leakage is improved and signal to noise ratio (S/N ratio) descends, the windowing process here specifically can be adopted the hamming window.
The frequency domain anti-interference process here specifically can adopt Threshold detection method, K spectral line algorithm or median filtering method.
In the present embodiment, specifically adopt the Threshold detection method.The key issue of Threshold detection method is how to select suitable thresholding, and it is to disturb suppressedly to fall that useful signal is used as in the too low meeting of threshold settings; The too high of threshold settings can curb the very strong interference of power.
Adopt single order to determine thresholding apart from method here.Single order needs the single order distance of estimating received signal spectral line amplitude apart from method, its threshold value changes along with the change of the statistical property that receives signal, be a kind of adaptive threshold computing method, detailed process is as follows: the length of supposing every batch data is M, and so each FFT computing meeting obtains M root spectral line, if its amplitude is a (i), i=1 wherein, 2 ... M, single order apart from the interference detection threshold computing formula of method is so:
Wherein, λ is the thresholding Optimization Factor that sets in advance, and general value is between 2 to 5.Can be found apart from the interference detection threshold computing formula of method by single order, this threshold value equal the spectral line amplitude mean value λ doubly, the value of λ directly has influence on jamproof effect, needs specifically to determine according to actual conditions.
Fig. 3 has provided the schematic diagram of spatial domain anti-interference process, the anti-interference part in spatial domain in the present embodiment is finished by four array-element antenna, the output signal of each bay multiplies each other with an adaptive weight, wherein first via weights are fixed as 1, then four road signal plus, finish the spatial domain anti-interference.
Fig. 4 has provided the schematic diagram of the satellite navigation receiver anti-interference method of the present embodiment, as can be seen from Figure 4, the present embodiment is that the anti-interference spatial domain of then carrying out, advanced line frequency territory is anti-interference, carry out respectively frequency domain from four road signals of four array elements output of receiving antenna anti-interference, then output to simultaneously the anti-interference part in spatial domain, and then it is anti-interference to finish the cascade in frequency domain and spatial domain.
Method of the present invention has absorbed the advantage of frequency domain Anti-Jamming Technique and spatial domain Anti-Jamming Technique simultaneously, can adopt field programmable gate array (Field-Programmable Gate Array, FPGA) logical device, consist of a noise killer by the configuration to its internal logic resource, with realization the undesired signal in the satellite navigation receiver is suppressed.
Method of the present invention has following advantage and exists: (1) can suppress the untamed wideband interferer signal of frequency domain Anti-Jamming Technique; The total number of the interference that (2) can suppress is greater than the array number of receiving antenna; (3) can use FPGA to realize, be conducive to the Miniaturization Design of whole receiver, in the situation that do not increase receiving antenna array element the maximum interference number that receives the function inhibition be increased, have the advantages such as high-performance, miniaturization, low cost.
Those of ordinary skill in the art will appreciate that, embodiment described here is in order to help reader understanding's principle of the present invention, should to be understood to that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not break away from essence of the present invention according to these technology enlightenments disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (6)
1. an anti-interference method specifically comprises the steps:
The signal of each bay output of satellite navigation receiver radio-frequency front-end is divided into two-way, is designated as: first via signal and the second road signal; First via signal is processed through windowing process, 1/2 delay disposal and the laggard line frequency of Fourier transform territory anti-interference process successively; The the second road signal is processed through the laggard line frequency of 1/2 delay disposal, windowing process and Fourier transform territory anti-interference process successively; After will carrying out respectively doing overlapping processing behind the inverse fourier transform through the first via signal after the frequency domain anti-interference process and the second road signal, the signal after the overlapping processing be through the output data after the frequency domain anti-interference process;
The output data through after the frequency domain anti-interference process of a plurality of each bay output are input to respectively in the corresponding spatial filter, and the data with each spatial filter output are weighted processing again, namely finish the spatial domain anti-interference process.
2. anti-interference method according to claim 1 is characterized in that, described windowing process specifically can be adopted the hamming window.
3. anti-interference method according to claim 1 and 2 is characterized in that, described frequency domain anti-interference process specifically adopts the Threshold detection method.
4. anti-interference method according to claim 3 is characterized in that, specifically adopts single order to determine described thresholding apart from method.
5. anti-interference method according to claim 4, it is characterized in that, described single order is as follows apart from the detailed process of method: the length of establishing the data of each processing is M, can obtain M root spectral line behind so each Fourier transform, and establishing its amplitude is a (i), wherein, i=1,2 ... M, the interference detection threshold computing formula is so:
Wherein, λ is the thresholding Optimization Factor that sets in advance.
6. anti-interference method according to claim 5 is characterized in that, the general value of described λ is between 2 to 5.
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| CN103675842A (en) * | 2013-11-26 | 2014-03-26 | 航天恒星科技有限公司 | Space-frequency joint anti-interference implementation method |
| CN104360355A (en) * | 2014-12-05 | 2015-02-18 | 北京北斗星通导航技术股份有限公司 | Anti-interference method and device |
| CN104682977A (en) * | 2014-12-30 | 2015-06-03 | 北京航天科工世纪卫星科技有限公司 | Airspace anti-jamming method of high-dynamic motion carrier satellite communication |
| CN105572695A (en) * | 2014-11-07 | 2016-05-11 | 航天恒星科技有限公司 | Anti-interference method and system |
| CN106160786A (en) * | 2015-04-09 | 2016-11-23 | 大唐联诚信息系统技术有限公司 | Signal processing method and device |
| CN107789008A (en) * | 2017-11-29 | 2018-03-13 | 声泰特（成都）科技有限公司 | A kind of self-adapting ultrasonic beam synthetic method and system based on channel data |
| CN108196269A (en) * | 2017-12-29 | 2018-06-22 | 中国电子科技集团公司第二十研究所 | The weak harmonic interference signals detection method of anti-interference antenna of satellite navigation internal system |
| CN108445755A (en) * | 2018-03-07 | 2018-08-24 | 中国人民解放军空军工程大学 | Electronic jammers spatial domain based on refined Hook Jeeves algorighm delineates method |
| CN109194220A (en) * | 2018-10-14 | 2019-01-11 | 张晓瑜 | A kind of anti-interference control method of permanent magnetic speed-adjusting high-voltage three-phase asynchronous motor |
| CN109245643A (en) * | 2018-10-14 | 2019-01-18 | 张晓瑜 | The anti-interference control method of frequency converting speed regulating three-phase asynchronous electromotor peculiar to vessel |
| CN112817014A (en) * | 2020-12-31 | 2021-05-18 | 北京理工大学 | Narrow-band anti-interference method suitable for time-frequency domain self-adaption |
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| CN103675842B (en) * | 2013-11-26 | 2015-11-25 | 航天恒星科技有限公司 | A kind of empty frequency combines anti-interference realization method |
| CN103675842A (en) * | 2013-11-26 | 2014-03-26 | 航天恒星科技有限公司 | Space-frequency joint anti-interference implementation method |
| CN105572695A (en) * | 2014-11-07 | 2016-05-11 | 航天恒星科技有限公司 | Anti-interference method and system |
| CN104360355A (en) * | 2014-12-05 | 2015-02-18 | 北京北斗星通导航技术股份有限公司 | Anti-interference method and device |
| CN104682977A (en) * | 2014-12-30 | 2015-06-03 | 北京航天科工世纪卫星科技有限公司 | Airspace anti-jamming method of high-dynamic motion carrier satellite communication |
| CN104682977B (en) * | 2014-12-30 | 2017-08-25 | 北京航天科工世纪卫星科技有限公司 | A kind of spatial domain anti-interference method of high dynamic motion carrier satellite communication |
| CN106160786B (en) * | 2015-04-09 | 2018-12-07 | 大唐联诚信息系统技术有限公司 | Signal processing method and device |
| CN106160786A (en) * | 2015-04-09 | 2016-11-23 | 大唐联诚信息系统技术有限公司 | Signal processing method and device |
| CN107789008A (en) * | 2017-11-29 | 2018-03-13 | 声泰特（成都）科技有限公司 | A kind of self-adapting ultrasonic beam synthetic method and system based on channel data |
| CN107789008B (en) * | 2017-11-29 | 2021-03-19 | 声泰特（成都）科技有限公司 | Self-adaptive ultrasonic beam synthesis method and system based on channel data |
| CN108196269A (en) * | 2017-12-29 | 2018-06-22 | 中国电子科技集团公司第二十研究所 | The weak harmonic interference signals detection method of anti-interference antenna of satellite navigation internal system |
| CN108196269B (en) * | 2017-12-29 | 2021-05-04 | 中国电子科技集团公司第二十研究所 | Method for detecting weak harmonic interference signal in satellite navigation anti-interference antenna system |
| CN108445755A (en) * | 2018-03-07 | 2018-08-24 | 中国人民解放军空军工程大学 | Electronic jammers spatial domain based on refined Hook Jeeves algorighm delineates method |
| CN109194220A (en) * | 2018-10-14 | 2019-01-11 | 张晓瑜 | A kind of anti-interference control method of permanent magnetic speed-adjusting high-voltage three-phase asynchronous motor |
| CN109245643A (en) * | 2018-10-14 | 2019-01-18 | 张晓瑜 | The anti-interference control method of frequency converting speed regulating three-phase asynchronous electromotor peculiar to vessel |
| CN112817014A (en) * | 2020-12-31 | 2021-05-18 | 北京理工大学 | Narrow-band anti-interference method suitable for time-frequency domain self-adaption |
| CN112817014B (en) * | 2020-12-31 | 2023-05-12 | 北京理工大学 | Narrow-band anti-interference method suitable for time-frequency domain self-adaption |
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