CN1110146C - Adaptive anti-interference high-front-end receiving method - Google Patents
Adaptive anti-interference high-front-end receiving method Download PDFInfo
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- CN1110146C CN1110146C CN99117273A CN99117273A CN1110146C CN 1110146 C CN1110146 C CN 1110146C CN 99117273 A CN99117273 A CN 99117273A CN 99117273 A CN99117273 A CN 99117273A CN 1110146 C CN1110146 C CN 1110146C
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Abstract
The present invention provides an adaptive anti-interference high-front-end receiving method. In the present invention, when spread spectrum information is processed by frequency mixing by using the differences between the band width of spread spectrum signals and interference signals, and the method of scan detection, interference frequency is transferred to a fixed medium frequency to be processed by adaptive wave trap processing, thereby adaptively suppressing interference signals, particularly preventing the problem of blocking the front end receiving caused by large power interference, effectively enhancing the anti-interference performance of spread spectrum communications and realizing receiving with the maximization of signal to interference ratio. The present invention has the outstanding advantages that real-time and effective suppression for strong interference can be realized; the limits of loop circuit convergence time, the limiting problems of phase lock tracking time, spread frequency code speed, etc. are avoided; information can be received without loss, interference or the tolerance of the spread frequency system by a specific mode.
Description
Technical field
The present invention relates to the adaptive anti-interference high-front-end receiving method in a kind of antijam communication field.
Background technology
Spread spectrum communication (comprise straight expansion and jump to expand, down with), have stronger anti-ly intercept, anti-interception capability, no matter be civilian or military, no matter be point-to-point communication or group-net communication, the spread spectrum system is all being undertaken more and more important role.But on the other hand, this system has also been brought because of the problem that is interfered easily behind the video stretching, particularly when interference signal surpasses the intrinsic AJ margin of spread spectrum system, can have a strong impact on communication efficiency.
Domestic and international many experts and scholars have done a large amount of research and exploration for the antijamming capability that improves spread spectrum communication to this.Show that according to applicant's Technical Follow-Up, research and retrieval recently etc. for many years the inhibition of interference is handled and is summed up as time-domain, frequency domain and three kinds of modes of spatial domain.1994, the 7th research institute of the ministry of electronics industry adopts the spatial domain processing, and means---self adaptation zero-bit antenna technology improved the antijamming capability of spread spectrum communication, and has obtained than obvious effects.During " eight or five ", developed the anti-interference process device that adopts frequency domain to combine again with the spatial domain signal processing technology.Simultaneously, also developed self adaptation intermediate frequency Canceller, attempt to improve the spread spectrum communication quality with time-frequency transform domain treatment technology, result of study shows, more than these modes or theoretical effect and the effect in various degree that under different occasions, played, but its certain adaptability and limitation is all arranged, and when especially the high front end of receive channel that causes when strong jamming stopped up, above measure was all with ineffective.Up to now, various anti-interference modes still have a certain distance also existing some technical problems in varying degrees from practice.
Summary of the invention
The present invention is directed to the deficiencies in the prior art part, provide a kind of and suppress interference signal adaptively, particularly prevent to produce because of high-power interference and cause adaptive anti-interference high-front-end receiving method the obstruction of high front end receive channel, effectively improve the interference free performance of spread spectrum communication, realize the maximized message pick-up of signal interference ratio.
Purpose of the present invention can reach by following measure; utilize spread-spectrum signal and the interference signal difference on bandwidth; by a series of scanning detection method; when spread spectrum information is carried out the one-level mixing; interfering frequency is moved on the fixing intermediate frequency; simultaneously according to the width of jamming signal bandwidth with select respectively to carry out in various degree real-time trap processing by different trappers; and when being carried out protecting energy, spread-spectrum signal finishes out-of-band noise filtering by tunable bandpass filters; carrier wave at required received signal carries out the secondary mixing then, and the broadband useful signal of rejecting after disturbing is moved on two intermediate frequencies of a standard.It is characterized in that it is by radiofrequency signal receive path A, interference detection module B, trap passage and transferred electron device C and intermediate-freuqncy signal output device D are connected to form, at first received signal and interference signal are at first imported by the prevention at radio-frequency port among the A, one route 3 is given next stage C as main branch road, the B circuit is delivered on another road, at this moment the B circuit passes through 4 with detected interfering frequency, 17,18,19 mix to a fixing intermediate frequency, then through 5,6 deliver to C, root a tree name B decides algorithm criterion interference detection results, select 9 or 10 or 8, the spread-spectrum signal and the interference signal that have obtained being suppressed, deliver to next stage D by 11 again, finish the signal resettlement of two intermediate frequencies, at this moment output is a spread spectrum broadband signal (referring to Fig. 1) that the usefulness of despread-and-demodulation can be provided.At this moment, the output signal of two intermediate frequencies is the letter mummification and reaches maximized useful signal.When not disturbing, can by control circuit dock in real time the breath of collecting mail carry out fixed form once, secondary mixing, receive to guarantee break-even signal.So far, the output of two intermediate frequencies can offer the next stage circuit and carry out despread-and-demodulation, and the above high front-end circuit of two intermediate frequencies has then been realized the signal interference ratio maximization receiving function of Adaptive Anti-jamming.
The comparing of more representational " counteracting of self adaptation intermediate frequency " mode in the present invention and the background technology has two big advantages: the one, and effective to the inhibition of disturbing, the present invention can reach 40 decibels, and the latter has only about 20 decibels.The 2nd, to the inhibition broader bandwidth of disturbing, when jamming bandwidth surpassed certain limit, the latter need increase processing loop or track loop, and volume is big, cost is high and make difficulty, and the present invention is subjected to the constraint of bandwidth less, realizes easily.
The present invention's volume of having compared with more representational " Adaptive Anti-jamming zero-bit antenna technology " mode in the background technology is little, the advantage that cost is low, because the latter is a kind of spatial domain interference protection measure, resist an interference and then need to increase a receive channel (comprising antenna-feedback system and receiver), this has not only increased the cost price of communication equipment, and the complexity of equipment and the limitation of use (being only limited to base station or base station uses) have been increased, and interface of the present invention is convenient, with low cost, among can receive channel with the present communication equipment of modular form body, in addition, the zero-bit antenna technology also is subjected to the restriction of interference radiating way, can be subjected to the influence of our signal of communication incidence angle when group-net communication, the present invention does not then have this constraint.The present invention also has three more outstanding advantages except that above-described advantage is arranged: the one, and the present invention can suppress strong jamming in real time, effectively, the receive channel clogging of having avoided strong jamming to cause, and background technology is difficult to reach effect like this; The 2nd, there are not the restricted problems such as loop convergence time, phase locked track time or spreading code speed that face in the background technology in the present invention, can suppress interference signal more fast, in real time; The 3rd, when not disturbing or when disturbing within the tolerance limit of spread spectrum system, the present invention can be by specific mode, harmless lost territory receives information, and background technology then can produce by the insertion loss about additional noise, additional phase shift or three decibels that signal distortion caused.The present invention also has the effect that the image frequency avoided is disturbed.
Description of drawings:
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing:
Fig. 1 is a theory diagram of the present invention, and drawing is described as follows:
1 high-frequency amplifier, 2 power dividers, 3AGC---automatic gain controller, 4 first order frequency mixers, 5 band pass filters, 6 amplifiers, 7 electronic switches, 8 through paths, 9,10 is the high Q value trapper of different bandwidth, 11 electronic switches, 12 Interference Detection frequency sweep synthetizers, 13 detect mixing, 14 narrow band filters, 15 amplifiers, 16 conversions and detection, 17 1 local oscillator synthetizers, 18 singlechip controllers, 19 interface circuits, 20 2 local oscillation circuits, 21 amplifiers, 22 second level frequency mixers, 23 filters, 24 amplifiers, 25AGC---automatic gain controller, 26 medium frequency output ends, 27 disturb the indication end.
Narration for convenience is divided into receive path A, interference detection module B, trap passage and transferred electron device C, intermediate-freuqncy signal output device D to accompanying drawing, promptly
A comprises 1,2 among Fig. 1,3,4,5,6,17;
B comprises 12,13 among Fig. 1,14,15,16,18,19;
C comprises 7,8 among Fig. 1,9,10,11;
D comprises 20,21 among Fig. 1,22,23,24,25.
Embodiment:
Adaptive anti-interference high-front-end receiving method shown in Figure 1 is one of embodiments of the invention, the communications band required according to the user, correctly choose first intermediate frequency, disturb the general selection standard intermediate frequency of second intermediate frequency (as 70MHz or 10.7MHz etc.) to avoid producing combination frequency.Received signal fr and interference signal fj are divided into two-way by the prevention at radio-frequency port among A input after 1,2, the one tunnel gives next stage C as main branch road after the control of 3 automatic gains, and 13 usefulness of making Interference Detection are delivered on another road.
Utilize spread-spectrum signal bandwidth, amplitude is little and jamming signal bandwidth is narrower, amplitude is bigger feature, detect the interfering frequency and the corresponding bandwidth that enter in the communications band in real time.Calculate the carrier frequency frequency difference Δ f of interference signal fj and received signal fr simultaneously, this function is finished by B.
To detect interfering frequency moves on first medium-frequency IF 1 by 4,17,18,19; and be the center with (IF1+ Δ f), be that the interval control filters of passband is carried out filtering with the bandwidth of spread spectrum desired signal; the spread spectrum broadband signal that receives can be fallen in the passband interval of this filter effectively; finished so that interfering frequency is moved on the first fixing intermediate frequency; simultaneously the energy of useful signal obtained protection, this function is finished by 5,18,19.Then, with IF1 is the center, according to the bandwidth of the bandwidth of spread-spectrum signal and the interference signal that may occur, make the hard trapper of high Q value of two or more different bandwidth respectively, notch bandwidth can be chosen 500KHz (or 1 MHz), 2MHz like shown in 9 among Fig. 1,10.
Main tributary signal (fr+fj) is come out by 5 adjustable bandwidth filters, again after 6 amplify according to A in detected interference signal frequency bandwidth, by fixed algorithm criterion, select respectively to carry out trap by different trappers, broader bandwidth carry out the broadband trap, bandwidth is narrower carries out the arrowband trap, can reduce the loss to useful signal so to greatest extent, and this function is finished by 7,9,10,11,18,19.8 is through path, the usefulness when supplying not need trap, and at this moment, the interference signal that is mingled in the spread-spectrum signal is suppressed.
Spread-spectrum signal after the filtering interfering comes out from 11, through after 21 again the carrier frequency at received signal fr carry out the secondary mixing, and by behind further two intermediate frequency filterings, amplification and the AGC (automatic gain control), what export is the spread spectrum broadband signal that can supply with the usefulness of next stage despread-and-demodulation, and this function is finished by D.
If do not have interference signal or interference signal within the spread spectrum AJ margin occurs surpassing, then can be by certain algorithm criterion and control mode, in real time received signal is carried out the mixing of one-level secondary by the fixing mode of trap that reaches not.Simultaneously, observe, but also specialized designs has Interference Detection indication interface for the ease of the user.Above function is finished by hardware circuit in the accompanying drawing and corresponding software programs.
Claims (1)
1. adaptive anti-interference high-front-end receiving method, it is characterized in that it is by radiofrequency signal receive path A, interference detection module B, trap passage and transferred electron device C and intermediate-freuqncy signal output device D are connected to form, received signal and interference signal are imported by the prevention at radio-frequency port in the A circuit, one route automatic gain controller (3) is given next stage C circuit as main branch road, the detection mixing (13) of B circuit is delivered on another road, the B circuit passes through first order frequency mixer (4) with detected interfering frequency, one local oscillator synthetizer (17), singlechip controller (18), interface circuit (19) mixes to a fixing intermediate frequency, then through band pass filter (5), amplifier (6) is delivered to C, the interference detection results of root a tree name B circuit, select high Q value trapper (9) or (10) or the through path (8) of different bandwidth, the spread-spectrum signal and the interference signal that have obtained being suppressed, deliver to next stage D circuit by electronic switch (11) again, finish the signal resettlement of two intermediate frequencies, at this moment output is a spread spectrum broadband signal that the usefulness of despread-and-demodulation can be provided.
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| Application Number | Priority Date | Filing Date | Title |
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| CN99117273A CN1110146C (en) | 1999-12-06 | 1999-12-06 | Adaptive anti-interference high-front-end receiving method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99117273A CN1110146C (en) | 1999-12-06 | 1999-12-06 | Adaptive anti-interference high-front-end receiving method |
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| CN1299190A CN1299190A (en) | 2001-06-13 |
| CN1110146C true CN1110146C (en) | 2003-05-28 |
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| CN99117273A Expired - Fee Related CN1110146C (en) | 1999-12-06 | 1999-12-06 | Adaptive anti-interference high-front-end receiving method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103905087A (en) * | 2012-12-24 | 2014-07-02 | 中国电子科技集团公司第五十研究所 | Broadband frequency-hopping radio frequency receiving system |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100442681C (en) * | 2002-10-11 | 2008-12-10 | 松下电器产业株式会社 | Wraparound canceller, relay system, and wraparound cancelling method |
| US7502410B2 (en) * | 2005-09-30 | 2009-03-10 | Freescale Semiconductor, Inc. | Method and system for controlling a notching mechanism |
| CN112272034B (en) * | 2020-10-22 | 2022-04-22 | 成都星象科技有限公司 | Variable frequency narrow-band interference suppression method for short-wave full-band reception |
| CN115250498A (en) * | 2021-04-25 | 2022-10-28 | 中国电信股份有限公司 | Method, device, system and storage medium for interference cancellation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1228889A (en) * | 1996-06-27 | 1999-09-15 | 拉马信号处理有限公司 | System and method for adaptive interference cancelling |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1228889A (en) * | 1996-06-27 | 1999-09-15 | 拉马信号处理有限公司 | System and method for adaptive interference cancelling |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103905087A (en) * | 2012-12-24 | 2014-07-02 | 中国电子科技集团公司第五十研究所 | Broadband frequency-hopping radio frequency receiving system |
| CN103905087B (en) * | 2012-12-24 | 2016-05-04 | 中国电子科技集团公司第五十研究所 | Wide interval frequency hopping radio-frequency receiving system |
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| CN1299190A (en) | 2001-06-13 |
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