CN108988928A - A method of the detection of two-channel monopulse angle error is carried out in frequency domain - Google Patents
A method of the detection of two-channel monopulse angle error is carried out in frequency domain Download PDFInfo
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- CN108988928A CN108988928A CN201810499063.4A CN201810499063A CN108988928A CN 108988928 A CN108988928 A CN 108988928A CN 201810499063 A CN201810499063 A CN 201810499063A CN 108988928 A CN108988928 A CN 108988928A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
- H04B7/18547—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station
- H04B7/1855—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station using a telephonic control signal, e.g. propagation delay variation, Doppler frequency variation, power variation, beam identification
-
- 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
-
- 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
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
-
- 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
Abstract
The invention discloses a kind of methods for carrying out the detection of two-channel monopulse angle error in frequency domain, belong to the technical field of radio-frequency antenna autotracking.The present invention include to the processing steps such as the FFT of signal and difference signal receiving channel processing and related, cumulative, FFT interframe the filtering of difference signal, normalization, realize the detection of high performance pulse angle error.The present invention is based on the digital demodulations that frequency domain carries out angle error, have the advantages that more signal kinds that can be worked, fast response time, integration degree is high, the signal-to-noise ratio that can work is low, delay corrects convenience, school phase precision height etc., is a kind of important improvement to the prior art.
Description
Technical field
The present invention relates to the paraboloid multimode feeds that radio-frequency antenna autotracking technical field more particularly to satellite communication use
The single-pulse track technology of antenna particularly relates to a kind of method for carrying out the detection of two-channel monopulse angle error in frequency domain.
Background technique
Current, most of Mono-pulse Tracking Receiver uses single pass angle error detection method, for example, various tune
Envelope detected method or correlation detection after system etc..But single channel causes track receiver and needs in higher signal-to-noise ratio
Lower work, some Mono-pulse Tracking Receivers are based on time domain angle error detection method, and the angle error of time domain using twin-channel
Demodulation can only realize lower delay correction accuracy and school phase precision, also not strong to the adaptability of signal bandwidth and signal type.
Summary of the invention
In view of this, it is an object of the invention to propose a kind of side for carrying out the detection of two-channel monopulse angle error in frequency domain
Method, this method can work under lower signal-to-noise ratio, carry out high-precision delay correction and phasing with can be convenient, can
To be adapted to the continuous signal of various bandwidth, such as: the modulated signal of simple signal, various bandwidth, even the noise letter in broadband
Number (such as sun, radio star signal source)；By increasing corresponding functional module, may also adapt in TDMA, frequency hopping, pulse tune
The interrupted signals such as system.
Based on above-mentioned purpose, present invention provide the technical scheme that
A method of the detection of two-channel monopulse angle error being carried out in frequency domain, is applied to following scene:
Antenna feed generates and signal and difference signal pass through identical low noise amplification, analog down, gain respectively
Amplification, then the identical and synchronous A/D of process is converted, the orthogonal processing of number zero intermediate frequency, is sampled respectively with signal and difference signal
Rate extracts transformation, then carries out identical 2 respectivelyNThe windowing FFT processing of point；The effective bandwidth of signal corresponds to FFT and exports frequency point
Section [- m, m], m is positive integer；
The following steps are included:
(1) to and the output valid interval of signal FFT in all the points take the plural number of complex conjugate and signal nth point total
YokeWith nth point Δ corresponding in the output valid interval of difference signal FFTnComplex multiplication is carried out, relevant frequency spectrum is obtained
(2) relevant frequency spectrum of all the points in signal effective bandwidth is carried outDelay inequality correction,
Middle delay inequality is that the frequency interval of the adjacent spectral line of τ, FFT output is ω, and e is natural constant, and j is imaginary unit；
(3) to relevant frequency spectrum all in the effective bandwidth after time delay adjustmentIt adds up, add up knot
Fruit is
(4) to and the output of signal FFT carry out the energy spectrums of all frequency points in effective bandwidth and calculate and add up, accumulation result
For
(5) cumulative to the calculated energy spectrum of FFT frame different in continuous timeIt is cumulative with relevant frequency spectrumIt carries out respectively
The filtering of interframe simultaneously reduces sample rate, respectively obtains that sample rate is suitble to output and signal energy Σ and correlation Δ；
(6) normalized value of frame filter result is calculated
(7) power with signal is calculated according to Σ, according toCalculate the angle error of antenna.
From narration above can be seen that the beneficial effects of the present invention are:
1, the present invention can be realized the single-shot digital demodulation of frequency domain, completes the delay correction and phase in channel with can be convenient
Bit correction.Relative to the implementation of traditional pulse time domain demodulation, adaptability of this method to signal bandwidth, correction parameter
Precision have biggish improvement；
2, present invention uses binary channels demodulation modes, the result after cumulative is carried out again and the normalization of difference signal.Phase
For the implementation of traditional single channel, time domain demodulation, this method can work under lower Signal-to-Noise and (improve
6dB or more)；
3, the present invention is adapted to the pulse demodulation of various continuous signals, as the modulation of simple signal, various bandwidth is believed
Number, signal, the noise signal etc. in a band frequency even in broadband signal；By increasing corresponding functional module, may be used also
To be adapted to the interrupted signal such as TDMA, frequency hopping, impulse modulation；
4, the present invention can be using high speed FPGA (field programmable gate array), DSP (Digital Signal Processing) chip or GPU
The high-speed figures chip such as (graphics processor) is hardware core, with the equipment of this principle manufacture with integration degree is high, volume
Small, structure is simple, high reliablity, it is easily scalable the advantages that.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is principle of the two-channel monopulse track receiver in the embodiment of the present invention in frequency domain progress angle error detection
Block diagram；
Fig. 2 be the non-single-frequency in the embodiment of the present invention and signal and difference signal pass through 2 respectivelyNPoint FFT treated width
Spend spectrogram；In Fig. 2, the three dB bandwidth of non-simple signal corresponds to FFT treated [- m, m] range, and nth point is [- m, m] model
Interior any point is enclosed, m and n are positive integer；When the band of signal is wider than [- m, m] range, [- m, m] then takes FFT to handle
The achievable maximum bandwidth for not causing aliasing of number；
Fig. 3 be the single-frequency in the embodiment of the present invention and signal and difference signal pass through 2 respectivelyNPoint FFT treated amplitude
Spectrogram；In Fig. 3, n-1, n, n+1 etc. three is corresponded in simple signal Jia Hanning (Hanning) window and FFT treated main lobe
Point, nth point are amplitude maximum points, and [- m, m] is the maximum bandwidth for not causing aliasing of FFT processing.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
A method of the detection of two-channel monopulse angle error is carried out in frequency domain, it is assumed that and signal processing channel and difference signal
The signal processing for the treatment of channel is successively:
1, after the identical low noise amplification of two-way, analog down converter, conversion receives received radiofrequency signal
The frequency of signal is to suitable centre frequency and is adjusted to suitable amplitude, it is assumed that analog down converter treated and signal with
Difference signal is respectively as follows:
Wherein ω1It is the centre frequency with signal, θ () is the phase function of the reception signal of zero-mean, and a () is to connect
The amplitude envelops function of the collection of letters number, μ are current normalization difference slope, and φ is the angle that antenna is offset from satellite axial direction,To close
At error angle, γ is difference signal relative to the phase with signal, and τ is the delay inequality with poor reception channel.
2. signal is by identical sampling rate and the high-speed a/d of synchronization is converted to digital signal.
3. converting digital signals into the complex signal of zero intermediate frequency using synchronous digital down converter.
4. two-way complex signal extracts transformation by synchronous sample rate and is transformed into suitable sampling rate, it is assumed that in process
State that treated and signal is respectively as follows: with difference signal
Wherein, ω0Be with the remaining sufficiently small centre frequency of signal, γ ' be difference signal relative to the fixation with signal
Phase, e are natural constant (being approximately equal to 2.71828), and j is imaginary unit.
5. complex signal is carried out 2 after synchronous windowed function processing againNAt the FFT (Fast Fourier Transform) of point
Reason.
6. the result of pair two-way FFT processing carries out subsequent pulse demodulation process again.According to the time shift of frequency-domain transform
Arbitrary nth point spectrum expression in matter and signal and difference signal difference FFT treated signal bandwidth [- m, m] are as follows:
Wherein, anFor the amplitude with signal FFT treated nth point frequency spectrum, θnFor with signal FFT treated nth point frequency
The phase of spectrum, ω is and the difference on the frequency of signal FFT treated adjacent spectral line, m are to induction signal effective bandwidth (usually 3dB
Bandwidth) FFT frequency point, m and n are positive integer.
This method is directed to the signal of treated two receiving channels, they are carried out with the angle error solution of pulse
Adjust, as shown in Figure 1, this method the following steps are included:
(1) to and the output valid interval of signal FFT in all the points take complex conjugate, by the plural number with signal nth point
ConjugationWith nth point Δ corresponding in the output valid interval of difference signal FFTnComplex multiplication is carried out, relevant frequency spectrum is obtainedSpecifically, it is divided into following situations:
(101) for broadband signal, all corresponding points in effective bandwidth are completed
According to formula (3), as shown in Figure 2 and spectrogram after signal FFT processing, arbitrary the in signal bandwidth [- m, m]
The conjugation of n point frequency spectrum isAnd poor relevant frequency spectrum therefore are as follows:
(102) for unifrequent signal, the difference according to institute's windowed function chooses different points, as Hanning window takes 3
A, rectangular window takes 5 or 7 points.
The single frequency signal as shown in Figure 3 nth point frequency spectrum of spectrogram and signal after FFT is handled is corresponding most substantially
The frequency spectrum of degree takes 3 points of n-1, n, n+1 of frequency spectrum to be calculated before FFT processing plus when Hanning window, and wherein n point can choose position
Any point in maximum bandwidth [- m, m] is capable of handling in FFT.
(2) relevant frequency spectrum of all the points in signal bandwidth is carried outDelay inequality correction, wherein when
The frequency interval for prolonging the adjacent spectral line that difference is τ, FFT output is ω.
Specifically, it is divided into following situations:
(201) for the time delay adjustment of broadband signal, it can choose and carried out in the valid interval exported with signal FFT,
Nth point therein is multiplied by ejnωτ；Also it may be selected to carry out in the valid interval that difference signal FFT is exported, nth point therein is multiplied by e-jnωτ；It also may be selected to cooperate frequency domain to carry out in time domain when time delay is larger.
The condition that must be carried out delay correction is that signal meetsMeetIt is regarded as broadband
Signal.
(202) for simple signal or satisfactionNarrow band signal, can be without time delay adjustment.
Condition without time delay adjustment isBeing delayed caused by τ influences sufficiently small to be to be regarded as narrowband
Signal.
For being inSignal, preferably carry out delay correction.
The time delay of simple signal can mutually be eliminated by school, so not needing to carry out delay correction.
(3) to relevant frequency spectrum all in the effective bandwidth [- m, m] after time delay adjustmentIt is tired to carry out plural number
Add, accumulation result is
(4) to and the output of signal FFT carry out the energy spectrums of all frequency points in effective bandwidth and calculate and add up, accumulation result
For
The energy spectrum of frequency point n in effective bandwidth is calculated, i.e., by the summed square square with imaginary part of real part, is obtainedThe energy accumulation with signal spectrum can be obtained as a result, are as follows:
(5) cumulative to the calculated energy spectrum of FFT frame different in continuous timeIt is cumulative with relevant frequency spectrumIt carries out respectively
The filtering of interframe simultaneously reduces sample rate, respectively obtains that sample rate is suitble to output and signal energy Σ and correlation Δ.
Each frame FFT obtains a DC form and signal energy valueWith correlationFor the FFT of broadband signal
Frame rate may be up to 1M times/second, and the noise bandwidth that high sample rate includes is too wide, it is therefore desirable to filter out noise and by output
Sample rate reduces.Simplest average down-sampled, cascade CIC (Cascaded integrator-comb, product can be used
Point-pectination cascade) down-sampled or FIR (Finite Impulse Response, there is limit for length's unit impulse response) is down-sampled, half
Band filters down-sampled, FORROW and filters down-sampled etc. the down-sampled mode of filtering, and the filtering by FFT interframe output valve is down-sampled
Afterwards, it can filter out and signal energyWith correlationIn include noise.
(6) normalized value of frame filter result is calculated
The calculating of normalized value can be before the frame filter of FFT, can also be after the frame filter of FFT.For noise
Relatively low broadband signal, calculating normalized value can be filtered out preferably after the frame filter of FFT includes in signal energy
Noise, to reduce the fluctuation of output error signal.
(7) power with signal is calculated according to Σ, according toCalculate the angle error of antenna.
Formula (8) is exactly the angle error of the plural form of standard, high-precision can correct channel in digital processing
Phase shift γ ' then obtains the angle error of antenna.
It should be understood by those ordinary skilled in the art that: the discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples.All within the spirits and principles of the present invention,
Any omission made to the above embodiment, modification, equivalent replacement, improvement etc., should be included in protection scope of the present invention it
It is interior.
Claims (1)
1. a kind of method for carrying out the detection of two-channel monopulse angle error in frequency domain, which is characterized in that be applied to following scene:
Antenna feed generates and signal and difference signal amplify by identical low noise amplification, analog down, gain respectively,
Then the identical and synchronous A/D of process is converted, the orthogonal processing of digital zero intermediate frequency, sample rate extract respectively with signal and difference signal
Transformation, then identical 2 are carried out respectivelyNThe windowing FFT processing of point；The effective bandwidth of signal corresponds to the section of FFT output frequency point
(- m, m), m are positive integer；
The following steps are included:
(1) to and the output valid interval of signal FFT in all the points take the complex conjugate of complex conjugate and signal nth point
With nth point Δ corresponding in the output valid interval of difference signal FFTnComplex multiplication is carried out, relevant frequency spectrum is obtained
(2) relevant frequency spectrum of all the points in signal effective bandwidth is carried outDelay inequality correction, wherein when
The frequency interval for prolonging the adjacent spectral line that difference is τ, FFT output is ω, and e is natural constant, and j is imaginary unit；
(3) to relevant frequency spectrum all in the effective bandwidth after time delay adjustmentIt adds up, accumulation result is
(4) to and the output of signal FFT carry out the energy spectrums of all frequency points in effective bandwidth and calculate and add up, accumulation result is
(5) cumulative to the calculated energy spectrum of FFT frame different in continuous timeIt is cumulative with relevant frequency spectrumInterframe is carried out respectively
Filtering and reduce sample rate, respectively obtain that sample rate is suitble to output and signal energy Σ and correlation Δ；
(6) normalized value of frame filter result is calculated
(7) power with signal is calculated according to Σ, according toCalculate the angle error of antenna.
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Cited By (7)
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| CN110940950A (en) * | 2019-11-28 | 2020-03-31 | 中国船舶重工集团公司第七一七研究所 | Difference slope stabilizing method |
| CN111458677A (en) * | 2020-03-05 | 2020-07-28 | 熊军 | Double-channel single-pulse amplitude-comparison angle measurement method and device |
| CN111638494A (en) * | 2020-05-31 | 2020-09-08 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Multi-channel amplitude and phase correction method for digital beam synthesis system |
| CN111783280A (en) * | 2020-06-10 | 2020-10-16 | 北京遥测技术研究所 | Single-pulse self-tracking design method based on logarithmic nonlinear detection |
| CN113965235A (en) * | 2021-11-06 | 2022-01-21 | 中国电子科技集团公司第五十四研究所 | Method for electronic beam scanning tracking demodulation by using TDMA signal |
| CN113965215A (en) * | 2021-11-06 | 2022-01-21 | 中国电子科技集团公司第五十四研究所 | Method for single pulse tracking demodulation by using high-speed frequency hopping signal |
| CN117713957A (en) * | 2024-02-06 | 2024-03-15 | 天津航天中为数据系统科技有限公司 | Method for tracking and self-adaptive phase correction of monopulse unmanned aerial vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110940950A (en) * | 2019-11-28 | 2020-03-31 | 中国船舶重工集团公司第七一七研究所 | Difference slope stabilizing method |
| CN110940950B (en) * | 2019-11-28 | 2022-03-22 | 中国船舶重工集团公司第七一七研究所 | Difference slope stabilizing method |
| CN111458677A (en) * | 2020-03-05 | 2020-07-28 | 熊军 | Double-channel single-pulse amplitude-comparison angle measurement method and device |
| CN111638494A (en) * | 2020-05-31 | 2020-09-08 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Multi-channel amplitude and phase correction method for digital beam synthesis system |
| CN111638494B (en) * | 2020-05-31 | 2022-09-02 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Multi-channel amplitude and phase correction method for digital beam synthesis system |
| CN111783280A (en) * | 2020-06-10 | 2020-10-16 | 北京遥测技术研究所 | Single-pulse self-tracking design method based on logarithmic nonlinear detection |
| CN113965235A (en) * | 2021-11-06 | 2022-01-21 | 中国电子科技集团公司第五十四研究所 | Method for electronic beam scanning tracking demodulation by using TDMA signal |
| CN113965215A (en) * | 2021-11-06 | 2022-01-21 | 中国电子科技集团公司第五十四研究所 | Method for single pulse tracking demodulation by using high-speed frequency hopping signal |
| CN113965215B (en) * | 2021-11-06 | 2023-01-03 | 中国电子科技集团公司第五十四研究所 | Method for single pulse tracking demodulation by using high-speed frequency hopping signal |
| CN113965235B (en) * | 2021-11-06 | 2023-12-29 | 中国电子科技集团公司第五十四研究所 | Method for scanning, tracking and demodulating electronic beam by using TDMA signal |
| CN117713957A (en) * | 2024-02-06 | 2024-03-15 | 天津航天中为数据系统科技有限公司 | Method for tracking and self-adaptive phase correction of monopulse unmanned aerial vehicle |
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