CN112904378B - Method, device and system for improving output in-band flatness of Beidou anti-interference antenna - Google Patents
Method, device and system for improving output in-band flatness of Beidou anti-interference antenna Download PDFInfo
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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
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/015—Arrangements for jamming, spoofing or other methods of denial of service of such systems
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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
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
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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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a method, a device and a system for improving the output in-band flatness of a Beidou anti-interference antenna, which comprise the following steps: step a, acquiring a space signal received by an antenna, and converting the space signal into a corresponding frequency domain signal; step b, performing anti-interference processing on the frequency domain signal to obtain a corresponding processing signal; step c, detecting amplitude differences of all frequency points in the processed signal and analyzing weighting coefficients of all frequency points in an effective bandwidth range; step d, carrying out amplitude weighting treatment on each frequency point in the effective bandwidth range according to the weighting coefficient to obtain a corresponding weighting signal; and e, converting the weighted signals into corresponding time domain signals, stabilizing the signal amplitude of the time domain signals, converting the signal amplitude of the time domain signals into analog signals, and outputting the analog signals after up-conversion processing. By the method, the amplitude of each frequency point can be ensured to be consistent, and the in-band flatness of anti-interference output is improved.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to a method, a device and a system for improving the output in-band flatness of a Beidou anti-interference antenna.
Background
At present, with globalization of the Beidou satellite navigation system layout, the application range of the Beidou satellite navigation system is wider and wider, the malicious interference of enemy is enhanced, and the matched anti-interference antenna index requirement is also improved. The anti-interference implementation modes are various, and whether the anti-interference implementation modes are time domain filtering, frequency domain filtering and spatial domain filtering, space-time adaptive filtering or space-frequency adaptive filtering and combined filtering, the radio frequency signals received by the antenna are converted into intermediate frequency, then converted into digital signals, processed by the digital signals, converted into analog intermediate frequency through a DAC, and converted into the return frequency signals after up-conversion. However, in a series of transformations, there are many filters present, both in the analog and in the digital domain. For the analog filter, along with the continuous improvement of the miniaturization requirement of the device, the unloaded Q value of the microwave resonator is obviously reduced, and the in-band flatness is deteriorated; for digital filters, which are limited by the circuit scale, in-band flatness also fluctuates in order to account for out-of-band rejection ratios and other parameters in the case of filter order determination. It is therefore desirable to provide a solution to improve the output in-band flatness of the anti-interference Beidou antenna.
Disclosure of Invention
The invention aims to provide a method, a device and a system for improving the output in-band flatness of a Beidou anti-interference antenna, which are used for achieving the technical effect of improving the output in-band flatness of the Beidou anti-interference antenna.
In a first aspect, the present invention provides a method for improving the output in-band flatness of a beidou anti-interference antenna, including:
step a, acquiring a space signal received by an antenna, and converting the space signal into a corresponding frequency domain signal;
step b, performing anti-interference processing on the frequency domain signal to obtain a corresponding processing signal;
step c, detecting amplitude differences of all frequency points in the processing signals and analyzing weighting coefficients of all frequency points in an effective bandwidth range;
step d, carrying out amplitude weighting processing on each frequency point in the effective bandwidth range according to the weighting coefficient to obtain a corresponding weighting signal;
and e, converting the weighted signals into corresponding time domain signals, stabilizing the signal amplitude of the time domain signals, converting the signals into analog signals, and outputting the analog signals after up-conversion filtering processing.
Further, the step c includes:
storing the processing signals in a first RAM (random access memory) by taking each frame as a unit, and analyzing a first corresponding relation between all frequency points in each frame signal and a first address in the first RAM;
analyzing the weighting coefficients of each frequency point and the reference frequency point in each frame signal according to the effective bandwidth range;
storing the weighting coefficients in a second RAM, and calculating a second corresponding relation between each frequency point and a second address in the second RAM;
and mapping out a third corresponding relation between the first address and the second address according to the first corresponding relation and the second corresponding relation.
Further, the step of analyzing the weighting coefficients of each frequency point and the reference frequency point in each frame signal according to the effective bandwidth range includes:
according to formula w Ai ＝A ref Calculating to obtain the amplitude errors of all frequency points of each frame of signal (i=1, 2,., /); wherein w is Ai Representing amplitude error, A ref The reference frequency points are represented, ai represents each frequency point in each frame of signal;
according to the sampling rate f s Frequency point number N of each frame signal and analog intermediate frequency center frequency point f 0 Calculating a useful signal bandwidth range by using the useful signal bandwidth B;
and acquiring the amplitude error of the in-band signal according to the useful signal bandwidth range to obtain a final weighting coefficient.
Further, the step d includes: sequentially acquiring the processing signals from the first RAM, and sequentially acquiring corresponding weighting coefficients from the second RAM according to the third corresponding relation; and carrying out amplitude weighting processing on the processing signals according to the weighting coefficients to obtain weighted signals.
In a second aspect, the invention provides a device for improving the flatness of the output band of a Beidou anti-interference antenna, which comprises a signal receiving module, an anti-interference processing module, an amplitude balancing module and a signal output module; the signal receiving module is used for acquiring a space signal received by the antenna and converting the space signal into a corresponding frequency domain signal; the anti-interference processing module is used for carrying out anti-interference processing on the frequency domain signals to obtain corresponding processing signals; the amplitude equalization module is used for detecting amplitude differences of all frequency points in the processing signal and calculating weighting coefficients of all frequency points in an effective bandwidth range; carrying out amplitude weighting treatment on each frequency point in the effective bandwidth range according to the weighting coefficient to obtain a corresponding weighting signal; the signal output module is used for converting the weighted signals into corresponding time domain signals, converting the signal amplitude of the time domain signals into analog signals after stabilizing the signal amplitude of the time domain signals, and outputting the analog signals after up-conversion processing.
Further, the signal receiving module comprises an antenna; a radio frequency channel connected to the antenna; an analog-to-digital converter connected to the radio frequency channel; and an FFT conversion circuit connected with the analog-to-digital converter.
Further, the signal output module comprises an IFFT conversion circuit connected with the output end of the amplitude equalization module; an AGC circuit connected to the IFFT circuit; a digital-to-analog converter connected to the AGC circuit; and an up-conversion filter circuit connected with the digital-to-analog converter.
Further, the amplitude equalization module includes a processor; a first RAM coupled to the processor; and a second RAM coupled to the processor; the processor comprises a weighting coefficient analysis unit and a signal weighting processing unit; the first RAM is used for storing processing signals; the weighting coefficient analysis unit is used for detecting amplitude differences of all frequency points in the processing signal, calculating weighting coefficients of all frequency points in the effective bandwidth range and storing the weighting coefficients in the second RAM; and the signal weighting processing unit is used for carrying out amplitude weighting processing on each frequency point in the effective bandwidth range according to the weighting coefficient to obtain a corresponding weighting signal.
In a third aspect, the invention provides a system for improving the output in-band flatness of a Beidou anti-interference antenna, which comprises the device for improving the output in-band flatness of the Beidou anti-interference antenna and terminal equipment connected with the device.
The invention has the beneficial effects that: the invention detects the amplitude errors of signals of different frequency points in the band through the amplitude equalization module arranged between the anti-interference processing circuit and the IFFT conversion circuit, calculates the weighting coefficient of each frequency point, carries out self-adaptive weighting on the amplitude of each frequency point in the effective bandwidth range, ensures that the amplitude of each frequency point is kept consistent, and improves the in-band flatness of the final anti-interference output.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method for improving in-band flatness of output of a beidou anti-interference antenna provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of a topology structure of a device for improving output in-band flatness of a beidou anti-interference antenna according to an embodiment of the present invention;
fig. 3 is a signal flow schematic diagram of an amplitude equalization module according to an embodiment of the present invention.
Icon: 100-a signal receiving module; 110-an antenna; 120-radio frequency channels; 130-an analog-to-digital converter; a 140-FFT conversion circuit; 200-an anti-interference processing module; 300-an amplitude equalization module; 310-a processor; 311-a signal weighting processing unit; 312-a weighting coefficient analysis unit; 320-a first RAM; 330-a second RAM; 400-a signal output module; 410-IFFT transformation circuit; 420-AGC circuitry; 430-digital-to-analog converter; 440-up-conversion filter circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, fig. 1 is a flowchart of a method for improving in-band flatness of an output band of a beidou anti-interference antenna according to an embodiment of the present invention.
The applicant has found that there are many filters present, both in the analog and in the digital domain. For the analog filter, along with the continuous improvement of the miniaturization requirement of the device, the unloaded Q value of the microwave resonator is obviously reduced, and the in-band flatness is deteriorated; for digital filters, which are limited by the circuit scale, in-band flatness also fluctuates in order to account for out-of-band rejection ratios and other parameters in the case of filter order determination. The present application provides a method to improve the output in-band flatness of the anti-interference Beidou antenna, and specific steps thereof are as follows.
And a step a, acquiring a space signal received by an antenna, and converting the space signal into a corresponding frequency domain signal.
In one embodiment, the spatial signal received by the antenna is converted into a digital signal by an analog-to-digital converter after being subjected to down-conversion, filtering and amplification by a radio frequency channel, and then the digital signal is converted into a frequency domain signal by an FFT conversion circuit.
And b, performing anti-interference processing on the frequency domain signal to obtain a corresponding processing signal.
And c, detecting amplitude differences of all frequency points in the processing signal and analyzing weighting coefficients of all frequency points in an effective bandwidth range.
In one embodiment, the amplitude equalization module may store the processed signal in the first RAM in units of each frame, and analyze a first correspondence between all frequency points in each frame signal and a first address in the first RAM; meanwhile, according to the effective bandwidth range, the weighting coefficients of each frequency point and the reference frequency point in each frame of signal are analyzed; storing the weighting coefficients in a second RAM, and calculating a second corresponding relation between each frequency point and a second address in the second RAM; and mapping out a third corresponding relation between the first address and the second address according to the first corresponding relation and the second corresponding relation.
Illustratively, the step of analyzing the weighting coefficients of the frequency points and the reference frequency points in each frame signal according to the effective bandwidth range includes:
according to formula w Ai ＝A ref Calculating to obtain the amplitude errors of all frequency points of each frame of signal (i=1, 2,., /); wherein w is Ai Representing amplitude error, A ref The reference frequency points are represented, ai represents each frequency point in each frame of signal;
according to the sampling rate f s Frequency point number N of each frame signal and analog intermediate frequency center frequency point f 0 Calculating a useful signal bandwidth range by using the useful signal bandwidth B;
and obtaining the amplitude error of the in-band signal according to the bandwidth range of the useful signal to obtain a final weighting coefficient.
Specifically, after the amplitude errors of all the frequency points of each frame signal are obtained, the weighting coefficient of the out-of-band signal can be set to zero according to the bandwidth range of the useful signal, only the amplitude errors of the in-band signal are reserved, and the amplitude errors are used as the weighting coefficients of all the frequency points of the in-band signal, wherein the following formula is shown in the specification:
wherein lambda is L Represents the minimum value of the effective bandwidth range, lambda H Representing the maximum of the effective bandwidth range.
And d, carrying out amplitude weighting processing on each frequency point in the effective bandwidth range according to the weighting coefficient to obtain a corresponding weighting signal.
In one embodiment, when the weighted signals are acquired, the processing signals can be sequentially acquired from the first RAM, and the corresponding weighted coefficients can be sequentially acquired from the second RAM according to the third corresponding relationship; and then carrying out amplitude weighting processing on the processing signals according to the weighting coefficients to obtain weighted signals. The method can be concretely expressed as follows:(i＝1,2，...，N)。
and e, converting the weighted signals into corresponding time domain signals, stabilizing the signal amplitude of the time domain signals, converting the signals into analog signals, and outputting the analog signals after up-conversion filtering processing.
In one embodiment, after the weighted signal after the amplitude weighting process is obtained, the weighted signal can be converted from the frequency domain to the corresponding time domain signal through an IFFT conversion circuit; secondly, stabilizing the signal amplitude of the time domain signal through an AGC circuit; then, converting the analog signals into analog signals through a digital-to-analog converter; finally, the output is carried out by an up-conversion filter circuit formed by the up-converter and the filter circuit.
Referring to fig. 2 and fig. 3, fig. 2 is a schematic diagram of a topology structure of a device for improving in-band flatness of output of a beidou anti-interference antenna according to an embodiment of the present invention; fig. 3 is a signal flow schematic diagram of an amplitude equalization module according to an embodiment of the present invention.
In an implementation manner, in order to implement the method, the embodiment of the present invention further provides a device for improving the in-band flatness of the output of the beidou anti-interference antenna, where the device includes a signal receiving module 100, an anti-interference processing module 200, an amplitude balancing module 300 and a signal output module 400; the signal receiving module 100 is configured to obtain a spatial signal received by an antenna, and convert the spatial signal into a corresponding frequency domain signal; the anti-interference processing module 200 is configured to perform anti-interference processing on the frequency domain signal to obtain a corresponding processed signal; the amplitude equalization module 300 is used for detecting amplitude differences of all frequency points in the processed signal and calculating weighting coefficients of all frequency points in the effective bandwidth range; carrying out amplitude weighting treatment on each frequency point in the effective bandwidth range according to the weighting coefficient to obtain a corresponding weighting signal; the signal output module 400 is configured to convert the weighted signal into a corresponding time domain signal, convert the signal amplitude of the time domain signal into an analog signal after stabilizing the signal amplitude, and output the analog signal after up-conversion.
In one embodiment, the signal receiving module 100 includes an antenna 110; a radio frequency channel 120 connected to the antenna 110; an analog-to-digital converter 130 coupled to the radio frequency channel 120; and an FFT conversion circuit 140 connected to the analog-to-digital converter 130.
Specifically, after the spatial signal is received by the antenna 110, the spatial signal is firstly subjected to down-conversion, filtering and amplification in the radio frequency channel 120, and the analog signal is converted into a digital signal by the analog-to-digital converter 130; the digital signal is then converted into a frequency domain signal by the FFT conversion circuit 140.
In one embodiment, the signal output module 400 includes an IFFT transformation circuit 410 coupled to the output of the amplitude equalization module 300; an AGC circuit 420 connected to the IFFT circuit 410; a digital-to-analog converter 430 coupled to AGC circuit 420; and an up-conversion filter circuit 440 coupled to the digital-to-analog converter 430.
Specifically, the weighted signal output by the amplitude equalization module 300 is transformed into a time domain signal by the IFFT transformation circuit 410, and then is transformed into an analog signal again by the digital-to-analog converter 430 after stabilizing the signal amplitude by the AGC circuit 420, and the analog signal is up-converted and filtered by the up-conversion filter circuit 440 and then is output to a subsequent processing device.
In one embodiment, the amplitude equalization module 300 includes a processor 310; a first RAM320 connected to the processor 310; and a second RAM330 connected to the processor 310; the processor 310 includes a weighting coefficient analysis unit 312 and a signal weighting processing unit 311; specifically, as shown in fig. 3, the signal flow of the amplitude equalization module 300, the first RAM320 is configured to store the processed signal after the anti-interference processing in units of one frame; the weighting coefficient analysis unit 312 is configured to calculate amplitude errors of all frequency points in the processing signal, and then generate weighting coefficients of the frequency points according to the effective bandwidth range and store the weighting coefficients in the second RAM 330. The signal weighting processing unit 311 is configured to perform address control on the first RAM320 and the second RAM330 according to the set frequency and the first and second correspondence, obtain the processing signal from the first RAM320, and obtain the weighting coefficient of each frequency point of the processing signal from the second RAM330; finally, the processor 310 performs amplitude weighting processing on each frequency point in the effective bandwidth range through the weighting coefficient, and obtains a corresponding weighted signal and outputs the weighted signal to the IFFT circuit.
Further, the embodiment of the invention also provides a system for improving the in-band flatness of the anti-interference Beidou antenna output, which comprises the device for improving the in-band flatness of the anti-interference Beidou antenna output and terminal equipment connected with the device. The terminal equipment can be a server, a PC (personal computer) terminal, a notebook computer and the like.
In summary, the embodiment of the invention provides a method, a device and a system for improving the output in-band flatness of a Beidou anti-interference antenna, which comprise the following steps: step a, acquiring a space signal received by an antenna, and converting the space signal into a corresponding frequency domain signal; step b, performing anti-interference processing on the frequency domain signal to obtain a corresponding processing signal; step c, detecting amplitude differences of all frequency points in the processed signal and analyzing weighting coefficients of all frequency points in an effective bandwidth range; step d, carrying out amplitude weighting treatment on each frequency point in the effective bandwidth range according to the weighting coefficient to obtain a corresponding weighting signal; and e, converting the weighted signals into corresponding time domain signals, stabilizing the signal amplitude of the time domain signals, converting the signal amplitude of the time domain signals into analog signals, and outputting the analog signals after up-conversion processing. The method comprises the steps of detecting amplitude errors of signals of different frequency points in a band, calculating a weighting coefficient of each frequency point, carrying out self-adaptive weighting on the amplitude of each frequency point in an effective bandwidth range, ensuring that the amplitude of each frequency point is consistent, and improving the in-band flatness of anti-interference output.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (9)
1. The method for improving the output in-band flatness of the Beidou anti-interference antenna is characterized by comprising the following steps of:
step a, acquiring a space signal received by an antenna, and converting the space signal into a corresponding frequency domain signal;
step b, performing anti-interference processing on the frequency domain signal to obtain a corresponding processing signal;
step c, detecting amplitude differences of all frequency points in the processing signals and analyzing weighting coefficients of all frequency points in an effective bandwidth range;
step d, carrying out amplitude weighting processing on each frequency point in the effective bandwidth range according to the weighting coefficient to obtain a corresponding weighting signal;
and e, converting the weighted signals into corresponding time domain signals, stabilizing the signal amplitude of the time domain signals, converting the signals into analog signals, and outputting the analog signals after up-conversion filtering processing.
2. The method according to claim 1, wherein said step c comprises:
storing the processing signals in a first RAM (random access memory) by taking each frame as a unit, and analyzing a first corresponding relation between all frequency points in each frame signal and a first address in the first RAM;
analyzing the weighting coefficients of each frequency point and the reference frequency point in each frame signal according to the effective bandwidth range;
storing the weighting coefficients in a second RAM, and calculating a second corresponding relation between each frequency point and a second address in the second RAM;
and mapping out a third corresponding relation between the first address and the second address according to the first corresponding relation and the second corresponding relation.
3. The method of claim 2, wherein analyzing the weighting coefficients of the respective frequency points and the reference frequency points in each frame signal according to the effective bandwidth range comprises:
according to formula w Ai ＝A ref Calculating to obtain the amplitude errors of all frequency points of each frame of signal (i=1, 2,., /); wherein w is Ai Representing amplitude error, A ref The reference frequency points are represented, ai represents each frequency point in each frame of signal;
according to the sampling rate f s Frequency point number N of each frame signal and analog intermediate frequency center frequency point f 0 Useful signal bandwidth B calculationA useful signal bandwidth range;
and acquiring the amplitude error of the in-band signal according to the useful signal bandwidth range to obtain a final weighting coefficient.
4. The method according to claim 2, wherein said step d comprises:
sequentially acquiring the processing signals from the first RAM, and sequentially acquiring corresponding weighting coefficients from the second RAM according to the third corresponding relation;
and carrying out amplitude weighting processing on the processing signals according to the weighting coefficients to obtain weighted signals.
5. Device for improving flatness in output band of Beidou anti-interference antenna, which is characterized by comprising: the device comprises a signal receiving module, an anti-interference processing module, an amplitude balancing module and a signal output module;
the signal receiving module is used for acquiring a space signal received by the antenna and converting the space signal into a corresponding frequency domain signal;
the anti-interference processing module is used for carrying out anti-interference processing on the frequency domain signals to obtain corresponding processing signals;
the amplitude equalization module is used for detecting amplitude differences of all frequency points in the processing signal and calculating weighting coefficients of all frequency points in an effective bandwidth range; carrying out amplitude weighting treatment on each frequency point in the effective bandwidth range according to the weighting coefficient to obtain a corresponding weighting signal;
the signal output module is used for converting the weighted signals into corresponding time domain signals, converting the signal amplitude of the time domain signals into analog signals after stabilizing the signal amplitude of the time domain signals, and outputting the analog signals after up-conversion processing.
6. The apparatus of claim 5, wherein the signal receiving means comprises an antenna; a radio frequency channel connected to the antenna; an analog-to-digital converter connected to the radio frequency channel; and an FFT conversion circuit connected with the analog-to-digital converter.
7. The apparatus of claim 5, wherein the signal output module comprises an IFFT transformation circuit coupled to an output of the amplitude equalization module; an AGC circuit connected to the IFFT circuit; a digital-to-analog converter connected to the AGC circuit; and an up-conversion filter circuit connected with the digital-to-analog converter.
8. The apparatus of claim 5, wherein the amplitude equalization module comprises a processor; a first RAM coupled to the processor; and a second RAM coupled to the processor; the processor comprises a weighting coefficient analysis unit and a signal weighting processing unit; the first RAM is used for storing processing signals; the weighting coefficient analysis unit is used for detecting amplitude differences of all frequency points in the processing signal, calculating weighting coefficients of all frequency points in the effective bandwidth range and storing the weighting coefficients in the second RAM; and the signal weighting processing unit is used for carrying out amplitude weighting processing on each frequency point in the effective bandwidth range according to the weighting coefficient to obtain a corresponding weighting signal.
9. A system for improving the in-band flatness of the output of a beidou anti-interference antenna, comprising the device of any one of claims 5-8 and a terminal device connected to the device.
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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 |
| CN105162459A (en) * | 2015-09-08 | 2015-12-16 | 四川九洲电器集团有限责任公司 | Power calibration method and system of DDS (Direct Digital Synthesizer) broadband signal source |
| CN106385289A (en) * | 2016-09-12 | 2017-02-08 | 武汉虹信通信技术有限责任公司 | Method and system for improving in-band flatness of network optimization equipment |
| CN110336572A (en) * | 2019-06-11 | 2019-10-15 | 三维通信股份有限公司 | A kind of gain flatness compensation method of transceiver |
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| US7437139B2 (en) * | 2005-10-26 | 2008-10-14 | Tzero Technologies, Inc. | Method and apparatus for calibrating filtering of a transceiver |
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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 |
| CN105162459A (en) * | 2015-09-08 | 2015-12-16 | 四川九洲电器集团有限责任公司 | Power calibration method and system of DDS (Direct Digital Synthesizer) broadband signal source |
| CN106385289A (en) * | 2016-09-12 | 2017-02-08 | 武汉虹信通信技术有限责任公司 | Method and system for improving in-band flatness of network optimization equipment |
| CN110336572A (en) * | 2019-06-11 | 2019-10-15 | 三维通信股份有限公司 | A kind of gain flatness compensation method of transceiver |
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