CN201910793U - Anti-interference device for filtering in frequency domain at front end of spread spectrum receiver - Google Patents
Anti-interference device for filtering in frequency domain at front end of spread spectrum receiver Download PDFInfo
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- CN201910793U CN201910793U CN2010206856215U CN201020685621U CN201910793U CN 201910793 U CN201910793 U CN 201910793U CN 2010206856215 U CN2010206856215 U CN 2010206856215U CN 201020685621 U CN201020685621 U CN 201020685621U CN 201910793 U CN201910793 U CN 201910793U
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Abstract
The utility model discloses an anti-interference device for filtering in a frequency domain at front end of a spread spectrum receiver, which comprises a receiver main body, wherein the receiver main body comprises a signal receiving preprocessor, a signal processor, and a signal output device which are connected in sequence. The anti-interference device provided by the utility model is used for filtering by utilizing the frequency domain characteristics of the narrow band interference to carry out restraining of the narrow band interference, thereby improving the signal to interference ratio (the maximum signal to interference ratio reaches 30dB), quickly restraining a large amount of narrow band and single frequency interference, eliminating the narrow band interference in the same direction of the signal in advance, and avoiding the influence of narrow band interference on the following airspace filtering.
Description
Technical field
The utility model relates to a kind of band spread receiver means for anti-jamming, specifically is meant a kind of band spread receiver front end frequency domain filtering means for anti-jamming.
Background technology
Along with scientific and technological progress and development, spread spectrum technic is widespread usage and each communications field more and more, as cdma communication system, and GPS and the Big Dipper two generations satellite navigation system etc.But owing to going from bad to worse of communication environment, band spread receiver is easy to be subjected to the influence of Radio Frequency Interfere (disturbing unintentionally or artificial disturbance), and all kinds of radio frequency interference can cause the received signal error rate to rise even make receiver can't work fully.Narrow band interference is the most common a kind of interference mode, and is because narrower, the concentration of energy of bandwidth, generation are convenient, particularly remarkable to the band spread receiver Effect on Performance.
The utility model content
The purpose of this utility model is to provide a kind of band spread receiver front end frequency domain filtering means for anti-jamming, utilizes the frequency domain character of narrow band interference to carry out filtering to finish the inhibition to narrow band interference.
The purpose of this utility model is achieved through the following technical solutions:
The utility model band spread receiver front end frequency domain filtering means for anti-jamming comprises that the signal that connects successively receives preprocessor, signal processor and signal output apparatus.By signal is received the back preliminary treatment, to reach the purpose that can carry out Filtering Processing to it, the signal after will handling is then exported, thereby realizes the detection and the effect feedback of signal.
Described signal receives preprocessor and comprises signal receiving device, primary signal processor that connects successively and the ADC digital to analog converter that is connected with signal processor, and described primary signal processor comprises the radio-frequency channel amplification processor that is connected with signal receiving device, the down-converted device that is connected with the ADC digital to analog converter.Receive preprocessor for signal, it comprises three parts, and be respectively applied for received signal, signal is amplified and carry out down-converted, so, for next step processing is prepared.
Described signal processor comprises anti-interference process circuit and base band signal process circuit, and described anti-interference process circuit receives preprocessor with signal and is connected, and the base band signal process circuit is connected with signal output apparatus.Signal processor comprises two parts: the anti-interference process circuit, carry out frequency domain filtering to signal and handle; The base band signal process circuit recovers to handle to the signal behind the frequency domain filtering, makes the needs of its satisfied demonstration, storage, exchanges data.
Described signal output apparatus is that the back end signal that is connected with signal processor shows and switch.
The utility model course of work may further comprise the steps:
(a) set up signal receiving device;
(b) pass through the signal receiving device received signal, and the signal that receives is carried out preliminary treatment;
(c) will carry out frequency domain filtering through pretreated signal handles;
(d) signal after will handling shows by display, and carries out storage, the exchange of signal with switch.
Wherein step (b) may further comprise the steps:
(b1) by the signal receiving device received signal;
(b2) signal that receives is carried out processing and amplifying by the radio-frequency channel amplification processor;
(b3) signal that amplification is obtained is handled through the down-converted device;
(b4) will handle the signal that obtains through the down-converted device and carry out numeral, the conversion of analog signal ground by the ADC D/A converter module.
Wherein step (c) may further comprise the steps:
(c1) will carry out Filtering Processing by the anti-interference process circuit through the signal that step (b) obtains;
(c2) signal that passes through Filtering Processing is passed through the base band signal process processing of circuit.
Wherein step (c1) may further comprise the steps:
(c11) FFT windowing conversion process;
(c12) signal through the windowing conversion process being carried out trap handles;
(c13) signal aliasing of distortion is handled.
Also adopt the auxiliary estimation technique to carry out the thresholding location estimation before carrying out step (c12) to the signal of handling through (b4).
The utility model compared with prior art has following advantage and beneficial effect:
1 the utility model band spread receiver front end frequency domain filtering means for anti-jamming utilizes the frequency domain character of narrow band interference to carry out filtering to finish the inhibition to narrow band interference, can reach the above signal interference ratio of maximum 30dB and improve;
2 the utility model band spread receiver front end frequency domain filtering means for anti-jammings can suppress the arrowband and the single-frequency of a greater number fast to be disturbed;
3 the utility model band spread receiver front end frequency domain filtering means for anti-jammings are eliminated and the equidirectional narrow band interference of signal in advance, avoid its influence to follow-up airspace filter.
Description of drawings
Fig. 1 is the utility model hardware connection diagram;
Fig. 2 is the utility model implementation method step c1 signal flow graph.
Embodiment
The utility model is described in further detail below in conjunction with embodiment, but execution mode of the present utility model is not limited thereto.
Embodiment
As shown in Figure 1, the present invention includes the signal receiving device, radio-frequency channel amplification processor, down-converted device, ADC digital to analog converter, anti-jamming circuit, base band signal process circuit and the back end signal that connect successively shows and switch.
The utility model realizes that the course of work of frequency domain filtering is as follows:
Signal is delivered to the radio-frequency channel amplification processor and carries out the channel processing and amplifying after receiving by receiving system, carries out frequency-conversion processing by the down-converted device then, and is digital signal with analog signal conversion, for frequency domain filtering is prepared; Digital signal after the conversion is under the anti-interference process circuit function, carry out with down conversion: at first signal is divided into two groups, wherein one group postponed for 1/2 Fourier transform processing time, utilized windowing Fourier transform (abbreviating FFT as) that two groups of time-domain signals are transformed to frequency-region signal then synchronously; Because the narrow band interference energy is big and frequency spectrum is comparatively concentrated, has significantly frequency domain character, by estimate its correspondence position in frequency domain after, its corresponding frequency band trap is eliminated again; Two groups of frequency-region signals after will handling at last revert to time-domain signal by Fourier inversion (abbreviating IFFT as); At last two groups of signals are carried out overlap-add procedure, and send the base band signal process processing of circuit, finally be implemented on the back end signal display and show, and carry out data management according to setting with switch.
As mentioned above, just can fine realization the present invention.
Claims (4)
1. band spread receiver front end frequency domain filtering means for anti-jamming is characterized in that: comprise that the signal that connects successively receives preprocessor, signal processor and signal output apparatus.
2. band spread receiver front end frequency domain filtering means for anti-jamming according to claim 1, it is characterized in that: described signal receives preprocessor and comprises signal receiving device, primary signal processor that connects successively and the ADC digital to analog converter that is connected with signal processor, and described primary signal processor comprises the radio-frequency channel amplification processor that is connected with signal receiving device, the down-converted device that is connected with the ADC digital to analog converter.
3. band spread receiver front end frequency domain filtering means for anti-jamming according to claim 1, it is characterized in that: described signal processor comprises anti-interference process circuit and base band signal process circuit, described anti-interference process circuit receives preprocessor with signal and is connected, and the base band signal process circuit is connected with signal output apparatus.
4. band spread receiver front end frequency domain filtering means for anti-jamming according to claim 1 is characterized in that: described signal output apparatus shows and switch for the back end signal that is connected with signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206856215U CN201910793U (en) | 2010-12-29 | 2010-12-29 | Anti-interference device for filtering in frequency domain at front end of spread spectrum receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206856215U CN201910793U (en) | 2010-12-29 | 2010-12-29 | Anti-interference device for filtering in frequency domain at front end of spread spectrum receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201910793U true CN201910793U (en) | 2011-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206856215U Expired - Lifetime CN201910793U (en) | 2010-12-29 | 2010-12-29 | Anti-interference device for filtering in frequency domain at front end of spread spectrum receiver |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082748A (en) * | 2010-12-29 | 2011-06-01 | 成都国星通信有限公司 | Anti-jamming device for front end frequency domain filtering of band-spread receiver and realizing method thereof |
| CN105301607A (en) * | 2015-11-20 | 2016-02-03 | 武汉梦芯科技有限公司 | Device, system and method for narrowband interference suppression of single-frequency and multi-frequency GNSS signals |
| TWI757195B (en) * | 2021-06-03 | 2022-03-01 | 瑞昱半導體股份有限公司 | Method for cancelling radio frequency interference and communication system thereof |
-
2010
- 2010-12-29 CN CN2010206856215U patent/CN201910793U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082748A (en) * | 2010-12-29 | 2011-06-01 | 成都国星通信有限公司 | Anti-jamming device for front end frequency domain filtering of band-spread receiver and realizing method thereof |
| CN105301607A (en) * | 2015-11-20 | 2016-02-03 | 武汉梦芯科技有限公司 | Device, system and method for narrowband interference suppression of single-frequency and multi-frequency GNSS signals |
| TWI757195B (en) * | 2021-06-03 | 2022-03-01 | 瑞昱半導體股份有限公司 | Method for cancelling radio frequency interference and communication system thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110727 |
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| CX01 | Expiry of patent term |