CN105652291A - Anti-narrow band interference adaptive filter, system and adaptive filtering method - Google Patents
Anti-narrow band interference adaptive filter, system and adaptive filtering method Download PDFInfo
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- CN105652291A CN105652291A CN201511016758.5A CN201511016758A CN105652291A CN 105652291 A CN105652291 A CN 105652291A CN 201511016758 A CN201511016758 A CN 201511016758A CN 105652291 A CN105652291 A CN 105652291A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/40—Correcting position, velocity or attitude
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Noise Elimination (AREA)
Abstract
The invention belongs to the satellite navigation signal processing technical field and discloses an anti-narrow band interference adaptive filter, an anti-narrow band interference adaptive system and an adaptive filtering method. The filter includes an interference amplitude calculation which is used for calculating interference amplitude y according to a weight w (n) and inputted reference interference signals u (n), a subtracter used for removing the interference amplitude y from digital intermediate-frequency signals d to obtain output signals e, and a weight calculation module used for calculating the weight w (n) according to the inputted reference interference signals u (n) and the output signals e. The filtering method includes the following steps that: first step, the reference interference signals u (n) are inputted to the interference amplitude calculation module and the weight calculation module, and the digital intermediate-frequency signals d are inputted to the wideband tunable subtractor; second step, the interference amplitude calculation module calculates the interference amplitude y according to the weight w (n); third step, the wideband tunable subtractor removes the interference amplitude y from the digital intermediate-frequency signals d to obtain the interference-filtered out output signals e, and outputs the output signals to a baseband in real time; and fourth step, the weight calculation model updates the weight w (n) according to the output signals e and the reference interference signals u (n) and transmits the weight w (n) to the interference amplitude calculation module, and the calculation of the second step, the third step and the fourth step is cycled.
Description
Technical field
The invention belongs to satellite navigation signals processing technology field, in particular to auto adapted filtering device and the adaptive filter method of a kind of anti-selective interference.
Background technology
The satellite navigation signals power launched due to the Big Dipper/gps satellite is smaller, the reception power that signal arrives ground through transmission is very weak, and be that fixed frequency is launched, in addition the complex electromagnetic environment of near-earth, the Big Dipper/GPS is easy to be subject to the impact of band internal interference, and undesired signal is by jamming receiver to the reception of satellite-signal and demodulation. Jamming-to-signal ratio is less than to the undesired signal of 15dB and the Big Dipper/gps signal of 2MHz bandwidth, interference can be produced effectively to suppress by receiver signal process after despreading, but for the undesired signal that power is stronger, will there is degradation in the Big Dipper/GPS, even cannot the acquisition and tracking Big Dipper/gps satellite signal.
Summary of the invention
It is an object of the invention to provide the auto adapted filtering device of a kind of anti-selective interference and adaptive filter method, undesired signal effectively can be carried out filtering process by this filtering method, while filtering interference signals, remain useful signal composition to greatest extent, ensure that the digital signal processor of rear class can carry out normal signal location.
For reaching above object, the present invention is achieved by the following technical solutions.
Scheme one:
The auto adapted filtering device of anti-selective interference, it is characterized in that: comprise the noise amplitudes calculating module for calculating noise amplitudes y according to reference undesired signal u (n) of weight w (n) and input, for digital medium-frequency signal d being removed the subtractor that noise amplitudes y obtains output signal e, calculate the weight computing module of weight w (n) for reference undesired signal u (n) according to input and output signal e.
The feature of technique scheme and further improvement:
Further, described noise amplitudes calculates module and comprises for by weight w (n) with carry out multiplication with reference to undesired signal u (n) and obtain the first multiplication result and the first multiplier of exporting, for being undertaken being added the totalizer obtaining noise amplitudes y by N number of first multiplication result.
Further, described subtractor is the adjustable subtractor in broadband.
Further, described weight computing module comprises for by output signal e with carry out multiplication with reference to undesired signal u (n) and obtain the 2nd multiplication result and the 2nd multiplier that exports, for carrying out being added the totalizer obtaining weight w (n) with the weight w (n-1) of last time by the 2nd multiplication result.
Further, the first input terminus of described subtractor is for inputting digital medium-frequency signal d, and its output terminal is used for output signal output e and is connected with the 2nd input terminus of weight computing module; Described noise amplitudes calculates the first input terminus of module for inputting with reference to undesired signal u (n), and its 2nd input terminus is connected with the output terminal of weight computing module, and its output terminal is connected with the 2nd input terminus of subtractor; First input terminus of described weight computing module is for inputting with reference to undesired signal u (n);
First input terminus of described subtractor is as the input terminus of auto adapted filtering device, and the output terminal of described subtractor is as the output terminal of auto adapted filtering device.
Scheme two:
The Avaptive filtering system of anti-selective interference, based on the auto adapted filtering device of above-mentioned anti-selective interference, it is characterised in that: the auto adapted filtering device comprising the multiple anti-selective interference that output terminal is connected successively with input terminus.
Scheme three:
The adaptive filter method of anti-selective interference, based on the auto adapted filtering device of above-mentioned anti-selective interference, it is characterised in that: comprise the following steps:
The first step: input calculates module and weight computing module with reference to undesired signal u (n) to noise amplitudes, and input digital medium-frequency signal d to subtractor simultaneously;
2nd step: noise amplitudes calculates module and calculates noise amplitudes y according to weight w (n):
Wherein, n is signal number, n=0,1,2,3 N; The weight w (n) of original state is 0; And noise amplitudes y is transferred to subtractor;
3rd step: subtractor subtracts noise amplitudes y from digital medium-frequency signal d, obtains the output signal e after filtering interfering:
E=d-y,
Output signal e is outputted in real time base band, and is transferred to weight computing module simultaneously;
4th step: weight computing module upgrades weight w (n) according to output signal e with reference to undesired signal u (n):
W (n)=e �� u (n)+w (n-1),
And weight w (n) is transferred to noise amplitudes and calculates module, the calculating of circulation the 2nd step, the 3rd step, this step.
The feature of technique scheme and further improvement:
Further, weight w (n) and reference undesired signal u (n) are carried out multiplication by the first multiplier by noise amplitudes calculating module obtain the first multiplication result and export to totalizer, by totalizer, N number of first multiplication result is carried out addition and obtain noise amplitudes y.
Further, output signal e and reference undesired signal u (n) are carried out multiplication by the 2nd multiplier by weight computing module obtain the 2nd multiplication result and export to totalizer, carry out being added obtaining weight w (n) with the weight w (n-1) of last time by the 2nd multiplication result by totalizer.
Further, the value of N is greater than 500.
The auto adapted filtering device of the anti-selective interference of the present invention and adaptive filter method, it is possible to effectively undesired signal is carried out filtering process. While filtering interference signals, remain useful signal composition to greatest extent. Interference filtering adopts auto adapted filtering device, has more precipitous transitional zone than traditional filtering method, can also control filtering bandwidth by adjustment step-length parameter, reach the filtering effect to arrowband noise jamming.Effective suppression can be given to multiple continuous wave or selective interference, it is to increase the positioning performance that the Big Dipper/GPS is under selective interference environment by the mode of cascaded.
Accompanying drawing explanation
Fig. 1 is the connection structural representation of the auto adapted filtering device of the anti-selective interference of the present invention;
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
With reference to Fig. 1, it it is the connection structural representation of auto adapted filtering device of the anti-selective interference of the present invention; The auto adapted filtering device of this anti-selective interference comprises the noise amplitudes calculating module for calculating noise amplitudes y according to reference undesired signal u (n) of weight w (n) and input, for digital medium-frequency signal d being removed the subtractor that noise amplitudes y obtains output signal e, calculate the weight computing module of weight w (n) for reference undesired signal u (n) according to input and output signal e.
First input terminus of subtractor is for inputting digital medium-frequency signal d, and its output terminal is used for output signal output e and is connected with the 2nd input terminus of weight computing module; Noise amplitudes calculates the first input terminus of module for inputting with reference to undesired signal u (n), and its 2nd input terminus is connected with the output terminal of weight computing module, and its output terminal is connected with the 2nd input terminus of subtractor; First input terminus of weight computing module is for inputting with reference to undesired signal u (n). First input terminus of subtractor is as the input terminus of auto adapted filtering device, and the output terminal of subtractor is as the output terminal of auto adapted filtering device.
The input terminus of auto adapted filtering device connects external emission end, i.e. radio frequency module, and radio frequency module is used for auto adapted filtering device transmission of digital intermediate frequency signal d; First input terminus of the first input terminus and weight computing module that noise amplitudes calculates module all connects outer lock ring frequently, for providing with reference to undesired signal u (n) for auto adapted filtering device.
Noise amplitudes calculates module and comprises for by weight w (n) with carry out multiplication with reference to undesired signal u (n) and obtain the first multiplication result and the first multiplier of exporting, for being undertaken being added the totalizer obtaining noise amplitudes y by N number of first multiplication result.
Subtractor is the adjustable subtractor in broadband.
Weight computing module comprises for by output signal e with carry out multiplication with reference to undesired signal u (n) and obtain the 2nd multiplication result and the 2nd multiplier that exports, for carrying out being added the totalizer obtaining weight w (n) with the weight w (n-1) of last time by the 2nd multiplication result, totalizer stores the weights of last time.
The digital medium-frequency signal d that radio frequency module exports is with selective interference composition, and the auto adapted filtering device of this anti-selective interference, to digital medium-frequency signal d process, exports to the Big Dipper/GPS after filtering narrow-band interference signal.
The Avaptive filtering system of anti-selective interference, based on the auto adapted filtering device of above-mentioned anti-selective interference, comprises the auto adapted filtering device of the multiple anti-selective interference that output terminal is connected successively with input terminus. Input terminus, the output terminal of multiple auto adapted filtering device connect successively. Namely the output terminal of first auto adapted filtering device connects the input terminus of the 2nd auto adapted filtering device, and the output terminal of the 2nd auto adapted filtering device connects the input terminus of the 3rd auto adapted filtering device, so connects successively.
Filtering process for narrow-band interference signal can be realized by the mode of immunity module cascade, if only adopting one-level filtering process, useful signal is filtered device sideband deep fades also.The arrowband noise jamming (jamming-to-signal ratio is 35dB) being such as positioned at 0.1 times of signal bandwidth of signal spectral centroid, by means of only one-level filtering process, useful signal also filtered device sideband attenuation of looking around from frequency spectrum while filtering interfering. And adopt the method for two stages for the treatment of, and less step-length parameter is all set, the first step exports interference and is partly decayed, and useful signal is not almost attenuated. The second stage exports, and when undesired signal is suppressed in an effective scope, it is considerably less that useful signal is decayed.
The adaptive filter method of the auto adapted filtering device of above-mentioned anti-selective interference, comprises the following steps:
The first step: input calculates module and weight computing module with reference to undesired signal u (n) to noise amplitudes, and input digital medium-frequency signal d to the adjustable subtractor in broadband simultaneously.
2nd step: noise amplitudes calculates module and calculates noise amplitudes y according to weight w (n):
Wherein, n is signal number, n=0,1,2,3 N; The weight w (n) of original state is 0; And noise amplitudes y is transferred to the adjustable subtractor in broadband.
The value of N is greater than 500, N=1023 in the present embodiment, it is possible to arrange different values as required.
3rd step: the subtractor that broadband is adjustable subtracts noise amplitudes y from digital medium-frequency signal d, obtains the output signal e after filtering interfering:
E=d-y,
Output signal e is outputted in real time base band, and is transferred to weight computing module simultaneously.
4th step: weight computing module upgrades weight w (n) according to output signal e with reference to undesired signal u (n):
W (n)=e �� u (n)+w (n-1),
And weight w (n) is transferred to noise amplitudes and calculates module, the calculating of circulation the 2nd step, the 3rd step, this step.
Weight w (n) and reference undesired signal u (n) are carried out multiplication by the first multiplier by noise amplitudes calculating module obtain the first multiplication result and export to totalizer, by totalizer, N number of first multiplication result is carried out addition and obtain noise amplitudes y.
Output signal e and reference undesired signal u (n) are carried out multiplication by the 2nd multiplier by weight computing module obtain the 2nd multiplication result and export to totalizer, carry out being added obtaining weight w (n) with the weight w (n-1) of last time by the 2nd multiplication result by totalizer.
In the present embodiment, the digital medium-frequency signal d bit wide of input is 4 bits, and in order to reduce operation time, multiplying realizes after can adopting the special arithmetic unit exampleization oneself write; For each digital intermediate frequency sampling signal d, it is only necessary to 2 system works clocks just can realize. So, as long as meeting system works clock requency is that input 2 times of data sample rates can realize. If system works clock cannot frequency multiplication, it is also possible to adopt the way extracted by input signal to reach the requirement to real-time.
The auto adapted filtering device of the anti-selective interference of the present invention and adaptive filter method, it is possible to effectively undesired signal is carried out filtering process. While filtering interference signals, remain useful signal composition to greatest extent. Interference filtering adopts auto adapted filtering device, has more precipitous transitional zone than traditional filtering method, can also control filtering bandwidth by adjustment step-length parameter, reach the filtering effect to arrowband noise jamming. Effective suppression can be given to multiple continuous wave or selective interference, it is to increase the positioning performance that the Big Dipper/GPS is under selective interference environment by the mode of cascaded.
Although below embodiment of the present invention being described by reference to the accompanying drawings, but the present invention is not limited to above-mentioned specific embodiments and applications field, and above-mentioned specific embodiments is only schematic, guiding, instead of restrictive. The those of ordinary skill of this area is under the enlightenment of specification sheets, and when not departing from the scope that the claims in the present invention are protected, it is also possible to make a variety of forms, these all belong to the row of the present invention's protection.
Claims (10)
1. the auto adapted filtering device of anti-selective interference, it is characterized in that: comprise the noise amplitudes calculating module for calculating noise amplitudes y according to reference undesired signal u (n) of weight w (n) and input, for digital medium-frequency signal d being removed the subtractor that noise amplitudes y obtains output signal e, calculate the weight computing module of weight w (n) for reference undesired signal u (n) according to input and output signal e.
2. the auto adapted filtering device of anti-selective interference as claimed in claim 1, it is characterized in that: described noise amplitudes calculates module and comprises for by weight w (n) with carry out multiplication with reference to undesired signal u (n) and obtain the first multiplication result and the first multiplier of exporting, for being undertaken being added the totalizer obtaining noise amplitudes y by N number of first multiplication result.
3. the auto adapted filtering device of anti-selective interference as claimed in claim 1 or 2, it is characterised in that: described subtractor is the adjustable subtractor in broadband.
4. the auto adapted filtering device of anti-selective interference as claimed in claim 3, it is characterized in that: described weight computing module comprises for by output signal e with carry out multiplication with reference to undesired signal u (n) and obtain the 2nd multiplication result and the 2nd multiplier that exports, for carrying out being added the totalizer obtaining weight w (n) with the weight w (n-1) of last time by the 2nd multiplication result.
5. the auto adapted filtering device of anti-selective interference as claimed in claim 1 or 2, it is characterized in that: the first input terminus of described subtractor is for inputting digital medium-frequency signal d, and its output terminal is used for output signal output e and is connected with the 2nd input terminus of weight computing module; Described noise amplitudes calculates the first input terminus of module for inputting with reference to undesired signal u (n), and its 2nd input terminus is connected with the output terminal of weight computing module, and its output terminal is connected with the 2nd input terminus of subtractor; First input terminus of described weight computing module is for inputting with reference to undesired signal u (n);
First input terminus of described subtractor is as the input terminus of auto adapted filtering device, and the output terminal of described subtractor is as the output terminal of auto adapted filtering device.
6. the Avaptive filtering system of anti-selective interference, based on the auto adapted filtering device of the described anti-selective interference of the arbitrary item of Claims 1 to 5, it is characterised in that: the auto adapted filtering device comprising the multiple anti-selective interference that output terminal is connected successively with input terminus.
7. the adaptive filter method of anti-selective interference, based on the auto adapted filtering device of a kind of anti-selective interference described in the arbitrary item of Claims 1 to 5, it is characterised in that: comprise the following steps:
The first step, input calculates module and weight computing module with reference to undesired signal u (n) to noise amplitudes, and inputs digital medium-frequency signal d to subtractor simultaneously;
2nd step, noise amplitudes calculates module and calculates noise amplitudes y according to weight w (n):
Wherein, n is signal number, n=0,1,2,3 N; The weight w (n) of original state is 0; And noise amplitudes y is transferred to subtractor;
3rd step, subtractor subtracts noise amplitudes y from digital medium-frequency signal d, obtains the output signal e after filtering interfering:
E=d-y,
Output signal e is outputted in real time base band, and is transferred to weight computing module simultaneously;
4th step, weight computing module upgrades weight w (n) according to output signal e with reference to undesired signal u (n):
W (n)=e �� u (n)+w (n-1),
And weight w (n) is transferred to noise amplitudes and calculates module; The calculating of the 2nd step, the 3rd step and this step of circulating.
8. the adaptive filter method of anti-selective interference as claimed in claim 7, it is characterized in that: in noise amplitudes calculating module, by the first multiplier, weight w (n) and reference undesired signal u (n) are carried out multiplication obtain the first multiplication result and export to totalizer, by totalizer, N number of first multiplication result is carried out addition and obtain noise amplitudes y.
9. the adaptive filter method of anti-selective interference as claimed in claim 8, it is characterized in that: in weight computing module, by the 2nd multiplier, output signal e and reference undesired signal u (n) are carried out multiplication obtain the 2nd multiplication result and export to totalizer, carry out being added obtaining weight w (n) with the weight w (n-1) of last time by the 2nd multiplication result by totalizer.
10. the adaptive filter method of anti-selective interference as described in item as arbitrary in claim 7��9, it is characterised in that: the value of N is greater than 500.
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Cited By (2)
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| CN107515409A (en) * | 2017-07-25 | 2017-12-26 | 重庆大学 | The Nulling antenna beam synthesizing method of anti-impulse disturbances |
| CN109709581A (en) * | 2019-02-27 | 2019-05-03 | 中国电子科技集团公司第五十四研究所 | A kind of satellite navigation signals strong jamming cycle specificity parameter quickly detects acquisition methods |
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Application publication date: 20160608 |