CN107329122A - Signal processing system based on the Big Dipper - Google Patents
Signal processing system based on the Big Dipper Download PDFInfo
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- CN107329122A CN107329122A CN201710416555.8A CN201710416555A CN107329122A CN 107329122 A CN107329122 A CN 107329122A CN 201710416555 A CN201710416555 A CN 201710416555A CN 107329122 A CN107329122 A CN 107329122A
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/95—Radar or analogous systems specially adapted for specific applications for meteorological use
- G01S13/955—Radar or analogous systems specially adapted for specific applications for meteorological use mounted on satellite
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01W—METEOROLOGY
- G01W1/00—Meteorology
- G01W1/08—Adaptations of balloons, missiles, or aircraft for meteorological purposes; Radiosondes
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Environmental & Geological Engineering (AREA)
- Electromagnetism (AREA)
- Aviation & Aerospace Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental Sciences (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention discloses the signal processing system based on the Big Dipper, including：Sounding system processing unit and host computer；Wherein, the sounding system processing unit points to the multiple sounding targets of tracking using multi-beam directional diagram, and recognizes the signal source category of reception, and carrying out Adaptive Suppression to unrelated signal interference obtains process signal；The host computer is connected to the sounding system processing unit to parse the process signal.The interference that the signal processing system based on the Big Dipper overcomes unrelated signal of the prior art is larger, and overall structure is unreasonable, it is impossible to the problem of being communicated in real time, realizes the communication of host computer, carries out Adaptive Suppression to unrelated signal interference automatically.
Description
Technical field
The present invention relates to the radar exploration technique field, in particular it relates to a kind of signal processing system based on the Big Dipper.
Background technology
Weather radar sounding system is used to detect balloon borne sonde, receives sonde signal, and carry out direction finding to sonde
And tracking, as the real-time to weather prognosis and accuracy demand are gradually increased, it is necessary to carry out multiple soundings in different periods
Instrument is discharged, simultaneously because the electromagnetic environment of sounding also more comes complicated, the detection performance to ground in face of sonde is brought greatly
Challenge.
The interference of unrelated signal how is avoided, the problem of integrally-built reasonability turns into urgent need to resolve is improved.
The content of the invention
, should the signal processing system based on the Big Dipper it is an object of the invention to provide a kind of signal processing system based on the Big Dipper
The interference for overcoming unrelated signal of the prior art is larger, and overall structure is unreasonable, it is impossible to the problem of being communicated in real time,
The communication of host computer is realized, Adaptive Suppression is carried out to unrelated signal interference automatically.
To achieve these goals, the invention provides a kind of signal processing system based on the Big Dipper, the signal transacting system
System includes：Sounding system processing unit and host computer；Wherein, the sounding system processing unit is pointed to using multi-beam directional diagram
Multiple sounding targets are tracked, and recognize the signal source category of reception, carrying out Adaptive Suppression to unrelated signal interference obtains everywhere
Manage signal；The host computer is connected to the sounding system processing unit to parse the process signal.
Preferably, the sounding system processing unit is including being sequentially connected with lower module：Seven array element array antennas, simulation
Down-converted plate and self-adaptive numerical integration algorithm process plate；Wherein, the seven array element array antenna is by the sounding received
Instrument radiofrequency signal is sent to the analog down process plate, and the analog down process plate is to the sonde radiofrequency signal
Processing is converted into analog if signal and sent to the self-adaptive numerical integration algorithm process plate, the adaptive digital wave beam
Form process plate and AF panel is carried out to the analog if signal, and export for sonde signal resolution.
Preferably, the seven array element array antenna includes：Seven circular polarized antennas, seven circular polarized antennas composition is equal
Even face battle array.
Preferably, the spacing of two neighboring circular polarized antenna is half-wavelength in seven circular polarized antennas.
Preferably, six circular polarized antennas are uniformly distributed in on the circle of a length of radius of the half-wave；A remaining circle
Poliarizing antenna is arranged in center of circle position.
Preferably, the analog down process plate is including being sequentially connected with lower component：Low-noise amplifier, simulation filter
Ripple device and analog down converter；Wherein, the low-noise amplifier receives the sonde radiofrequency signal, and by the sonde
Radiofrequency signal amplification obtains signal A, and the sonde radiofrequency signal after the analog filter filtering amplification obtains signal B；
Signal B is converted into analog if signal by the analog down converter.
Preferably, the self-adaptive numerical integration algorithm process plate is including being sequentially connected with lower component：AD sampling modules,
Channel correcting module, aspect resolve module, AF panel module and D/A converter module；Wherein, the AD sampling modules
It is digital medium-frequency signal by analog if signal sample conversion；The channel correcting module carries out signal school to digital medium-frequency signal
Just；The aspect resolves module and carries out direction finding and tracking to multiple sondes using MUSIC algorithms；The AF panel mould
Block to useless interference signal using when Combined Treatment rectangular projection class algorithm carry out Adaptive Suppression and obtain signal C, and formed
Multi-beam directional diagram detects multiple instrument；Signal C is converted into analog if signal and by the simulation by the D/A converter module
Intermediate-freuqncy signal is exported for sonde signal resolution.
The signal processing system based on the Big Dipper of the present invention can realize the communication of sounding system processing unit and host computer,
The sounding system processing unit points to the multiple sounding targets of tracking using multi-beam directional diagram, and recognizes the signal source kind of reception
Class, carries out Adaptive Suppression to unrelated signal interference and obtains process signal.
Other features and advantages of the present invention will be described in detail in subsequent embodiment part.
Brief description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute a part for specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is a kind of structured flowchart of the signal processing system based on the Big Dipper of preferred embodiment of the present invention.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
The present invention provides a kind of signal processing system based on the Big Dipper, and the signal processing system includes：Sounding system processing
Device and host computer；Wherein, the sounding system processing unit points to the multiple sounding targets of tracking using multi-beam directional diagram, and
The signal source category received is recognized, carrying out Adaptive Suppression to unrelated signal interference obtains process signal；The host computer connects
The sounding system processing unit is connected to parse the process signal.
The signal processing system based on the Big Dipper of the present invention can realize the communication of sounding system processing unit and host computer,
The sounding system processing unit points to the multiple sounding targets of tracking using multi-beam directional diagram, and recognizes the signal source kind of reception
Class, carries out Adaptive Suppression to unrelated signal interference and obtains process signal.
The present invention a kind of embodiment in, the sounding system processing unit can include be sequentially connected with
Lower module：Seven array element array antennas, analog down process plate and self-adaptive numerical integration algorithm process plate；Wherein, described seven
Array element array antenna sends the sonde radiofrequency signal received to the analog down process plate, the analog down
Process plate is converted into analog if signal to sonde radiofrequency signal processing and sent to the adaptive digital wave beam shape
Into process plate, the self-adaptive numerical integration algorithm process plate to the analog if signal carry out AF panel, and export with
For sonde signal resolution.
By above-mentioned embodiment, overcome it is of the prior art can only be while handle an instrument, and can not realize anti-
The function of interference, using seven array-element antenna Array Designs, it is ensured that it is 3 degree of requirements that beam angle, which meets lateral precision, beneficial to visiting
Empty instrument signal maximum matching is received, beneficial to popularization and application.
In this kind of embodiment, the seven array element array antenna includes：Seven circular polarized antennas, seven circular polarisation
Antenna composition uniform surface battle array.
In this kind of embodiment, the spacing of two neighboring circular polarized antenna is half-wave in seven circular polarized antennas
It is long.Six array elements are evenly distributed on so that on the circle of a length of radius of half-wave, the 7th array element is arranged in the center of circle.
In this kind of embodiment, six circular polarized antennas are uniformly distributed in on the circle of a length of radius of the half-wave；It is surplus
A remaining circular polarized antenna is arranged in center of circle position.
In this kind of embodiment, the analog down process plate is including being sequentially connected with lower component：Low noise is put
Big device, analog filter and analog down converter；Wherein, the low-noise amplifier receives the sonde radiofrequency signal, and
Sonde radiofrequency signal amplification is obtained into signal A, the sonde radio frequency letter after the analog filter filtering amplification
Number obtain signal B；Signal B is converted into analog if signal by the analog down converter.
In order to preferably suppress out-of-band interference signal, sensitivity is improved, a high-performance arrowband band is added in the front end of system
Bandpass filter, to improve the antijamming capability of system, but the introducing of wave filter, the increase of system front end noise coefficient can be made.Institute
In-band insertion loss small wave filter as far as possible should be selected with, system front end wave filter, and in order to reduce system volume and
It is easy to integrated, selection is SAW filter, and it is with interior Insertion Loss≤3dB.For circuit rear class filtering device, filtered using LC
Device, its feature is to have very high squareness factor, there is good suppression, Out-of-band rejection >=45dB to out of band signal.
In order to which the radiofrequency signal of input is amplified into certain level and noise coefficient is controlled, it is desirable to the low noise amplification of selection
Device must also have noise coefficient as small as possible in addition to gain is enough big.The low-noise amplifier of design has 15dB gains, noise
Coefficient≤3dB.
The effect of analog down converter is, by mixing, analog radio-frequency signal to be converted into intermediate frequency by input signal.Due to
The phase noise of local vibration source can be added on signal, it requires that the local vibration source output frequency of design is accurate, and phase noise
It is good.In order to prevent the mutual crosstalk between local oscillator, radio frequency, intermediate-freuqncy signal, in each port increase wave filter of frequency mixer.That chooses is mixed
Frequency device requires that its conversion loss is small, and noise coefficient is small, and dynamic range is big, and isolation is good.
In down coversion link, intermediate-frequency filter is critically important to radio-frequency leakage and local-oscillator leakage while also to filter out frequency conversion miscellaneous
Dissipate, be effectively guaranteed the purity of frequency spectrum of intermediate-freuqncy signal.SAW filter, though squareness factor is good, in-band insertion loss is excessive,
The linearity of link is greatly reduced, in order to effectively ensure Out-of-band rejection, and insertion loss is small, is improved after the link linearity
LC schemes are selected.
In this kind of embodiment, the self-adaptive numerical integration algorithm process plate can be including being sequentially connected with bottom
Part：AD sampling modules, channel correcting module, aspect resolve module, AF panel module and D/A converter module；Wherein,
Analog if signal sample conversion is digital medium-frequency signal by the AD sampling modules；The channel correcting module is to digital intermediate frequency
Signal carries out signal correction；The aspect resolves module and carries out direction finding and tracking to multiple sondes using MUSIC algorithms；
The AF panel module to useless interference signal using when Combined Treatment rectangular projection class algorithm carry out Adaptive Suppression obtain
To signal C, and form the multiple instrument of multi-beam directional diagram detection；Signal C is converted into analog intermediate frequency letter by the D/A converter module
Number and the analog if signal is exported for sonde signal resolution.
Wherein, AD sampling modules are intended using High-Speed Double-Channel A-D converter, 16 bit quantizations, exportable complement code and skew
The data of binary system or Gray code format.In rising edge clock sampling, highest sample rate 125MSPS.The mould of each passage input
It is up to 2V to intend signal peak-to-peak value.16 quantify output, exportable complement code and offset code or Gray code number format.It all
Index all meets design requirement, and built-in reference voltage and sampling hold circuit, and peripheral circuit is simple.Analog signal input is adopted
Use Differential Input pattern.The radio frequency input and output voltage that Differential Input is selected using transformer compares 1:1.In order to coaxial cable
50 Ω transfer impedances match, and the entry design input impedance of analog signal is 50 Ω.The sampling clock of A/D module is by frequency conversion mould
Block is provided.FPGA sampling clocks are provided by AD.
Channel correcting module is to realize the uniformity of each passage.Array antenna due to individual difference, inter-element mutual coupling,
Electromagnetic environment complexity etc. influence and produce amplitude and phase it is inconsistent, it is necessary to be calibrated and compensated for.Algorithm implementation steps
It is as follows：DSP1 is transmitted in each passage FPGA sampling N points of aerial array, DSP1 is FFT to each channel data and searched for respectively
Go out the maximum of passage frequency domain point, the ratio of the maximum and other passage relevant positions plural number is the processing system of other passages
Number, i.e. amplitude and phase correction are weighed.
MUSIC algorithms directly carry out Eigenvalues Decomposition to the covariance for receiving data, by the number for finding big characteristic value
To determine the number of signal source, and noise subspace and signal guide vector are opened into using the corresponding characteristic vector of small characteristic value
Into signal subspace between orthogonality, construct space spectral function, determine the ripple of signal up to side by way of peak value searching
To, but the peak value of spectral function is not the size of specific signal power or noise power, its acuity and peak value
Good and bad degree orthogonal between signal subspace and noise subspace is shown.
Because MUSIC algorithm characteristics of needs value is decomposed and determines the number and noise of signal according to the number of big characteristic value
Subspace, then accurately confirming the number of big characteristic value just becomes the prerequisite for successfully obtaining signal direction of arrival.
The mathematical modeling of array, defines the spatial correlation of two signals
In formula
Composite type (1) understands ρ ∈ [0,1] with formula (2).When two signals incidence angle closer to when coefficient correlation it is bigger,
Signal characteristic value tag Distribution value after then covariance matrix is decomposed is more uneven, between larger characteristic value and smaller characteristic value
Gap is bigger；When the incidence angle of and if only if two signals is identical, i.e. ρ=1, now the energy of two signals weigh completely
Folded, the number of signal characteristic value will be reduced.
Covariance is carried out after Eigenvalues Decomposition, obtained characteristic value meets relation
λ1≥λ2≥…≥λP≥λP+1=...=λM=σ2 (3)
Understand that all big characteristic values may be expressed as linear group of each signal power according to formula (2) and formula (3)
Close with noise power and, i.e.,
Wherein αj∈ [0,1], j=1,2 ..., P is each power weightings coefficient.If the power s of incoming signalj 2It is smaller, or
Person is due to the larger i.e. α of the space correlation coefficient of multiple incoming signalsjIt is smaller, then it can cause the smaller feature in part in big characteristic value
Value and noise power closely, and then influence the accurate judgement and the accurate estimation to signal number of big characteristic value number.One
The characteristic vector of some signals is doped with denier noise subspace, the estimation to signal direction of arrival of algorithm can be had a strong impact on
Energy.
According to the Space-time domain combination treatment method that time-domain taps number is K, according to the analytical conclusions of previous section, it can obtain, it is right
All big characteristic values that covariance obtained after Eigenvalues Decomposition are represented by
Comparison expression (4) and (5) understand that after Space-time domain Combined Treatment, all signal powers have all been amplified to original
K times come.By the method for Space-time domain Combined Treatment, the power of incoming signal can be amplified so that covariance matrix
Characteristic value is the power of incoming signal is smaller or during larger incoming signal spatial correlation, the less spy in part in big characteristic value
Value indicative can be much larger than noise power, it is ensured that accurate judgement of the algorithm to signal number, improve algorithm and direction of arrival is estimated
Count performance.
Covariance is carried out after Eigenvalues Decomposition, the signal subspace of the corresponding characteristic vector of all big characteristic values is obtained
Space US-st∈CMK×PThe noise subspace U of characteristic vector corresponding with all small characteristic valuesN-st∈CMK×(MK-P), then
Space-time domain extension is carried out to scanning steering vector, at the spatial spectrum construction of function Space-time domain joint of pure spatial domain MUSIC algorithms
The space spectral function of reason is
Or
Peak value searching is carried out to space spectral function, the angle corresponding to peak value is the direction of arrival of signal.
AF panel module in the 3rd step known disturbances azimuth information be priori conditions in the case of, element number of array is M, P
The steering vector matrix of individual independent far field arrowband interference is A, chooses appropriate delay exponent number K and delay factor
Z=exp (j*2 π fcτ) (8)
Wherein fcFor the carrier frequency of interference signal, τ is delay time lag, then the space-time steering vector point of desired signal
It is not
The space-time steering vector of interference signal is
Similarly understand that the space time constraint of linear restriction orthographic projection is oriented to matrix and is
Then the optimal adaptive weight vector of the rectangular projection class algorithm of space-time joint processing is
Wst=Cst(Cst HCst)-1f (12)
Or
Wst=(I-Ast(Ast HAst)-1Ast H)ast(θ0) (13)
From the point of view of the result of formula (12) and formula (13), space domain self-adapted weight vector is expanded to M × K by space-time joint processing
Tie up, then the reception data matrix of array signal needs to be extended to
Then array is output as
Y (t)=Wst HXst (15)
Space-time joint processing method adds the free degree of adaptive array indeed through time domain delay process, i.e.,
The dimension of covariance matrix is expanded, with reference to the mathematical analysis of space-time joint processing, it is known that when the dimension increase of covariance matrix
Afterwards, interference signal and the spatial correlation of desired signal are reduced to each other.Simultaneously because the dimension of whole array is expanded,
And the dimension of interference space does not change, so the dimension of the orthogonal complement space of interference space, i.e. noise subspace
Increased, this causes the stability of noise subspace to be improved, directional diagram gain of this stability for array
On show as interference position null it is more sharp, the directional diagram gain on non-interference direction is more flat.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, still, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the present invention, a variety of letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (7)
1. a kind of signal processing system based on the Big Dipper, it is characterised in that the signal processing system includes：Sounding system processing dress
Put and host computer；Wherein, the sounding system processing unit points to the multiple sounding targets of tracking using multi-beam directional diagram, and knows
The signal source category not received, carries out Adaptive Suppression to unrelated signal interference and obtains process signal；The host computer connection
In the sounding system processing unit to be parsed to the process signal.
2. the signal processing system according to claim 1 based on the Big Dipper, it is characterised in that the sounding system processing dress
Put including being sequentially connected with lower module：Seven array element array antennas, analog down process plate and self-adaptive numerical integration algorithm
Process plate；Wherein, the seven array element array antenna sends the sonde radiofrequency signal received to the analog down
Plate is managed, the analog down process plate is converted into analog if signal to sonde radiofrequency signal processing and sent to institute
Self-adaptive numerical integration algorithm process plate is stated, the self-adaptive numerical integration algorithm process plate is carried out to the analog if signal
AF panel, and export for sonde signal resolution.
3. the signal processing system according to claim 2 based on the Big Dipper, it is characterised in that the seven array element array antenna
Including：Seven circular polarized antennas, seven circular polarized antennas composition uniform surface battle array.
4. the signal processing system according to claim 3 based on the Big Dipper, it is characterised in that seven circular polarized antennas
In two neighboring circular polarized antenna spacing be half-wavelength.
5. the signal processing system according to claim 4 based on the Big Dipper, it is characterised in that six circular polarized antennas are uniform
It is distributed in on the circle of a length of radius of the half-wave；A remaining circular polarized antenna is arranged in center of circle position.
6. the signal processing system according to claim 4 based on the Big Dipper, it is characterised in that the analog down processing
Plate is including being sequentially connected with lower component：Low-noise amplifier, analog filter and analog down converter；Wherein, the low noise
Acoustic amplifier receives the sonde radiofrequency signal, and sonde radiofrequency signal amplification is obtained into signal A, the simulation filter
The sonde radiofrequency signal after the filtering amplification of ripple device obtains signal B；Signal B is converted into simulation by the analog down converter
Intermediate-freuqncy signal.
7. the signal processing system according to claim 4 based on the Big Dipper, it is characterised in that the adaptive digital wave beam
Process plate is formed including being sequentially connected with lower component：AD sampling modules, channel correcting module, aspect resolve module, done
Disturb suppression module and D/A converter module；Wherein, analog if signal sample conversion is digital intermediate frequency by the AD sampling modules
Signal；The channel correcting module carries out signal correction to digital medium-frequency signal；The aspect resolves module and utilizes MUSIC
Algorithm carries out direction finding and tracking to multiple sondes；Combined Treatment when the AF panel module is utilized to useless interference signal
Rectangular projection class algorithm carries out Adaptive Suppression and obtains signal C, and forms the multiple instrument of multi-beam directional diagram detection；The digital-to-analogue turns
Signal C is converted into analog if signal and exports the analog if signal for sonde signal resolution by mold changing block.
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| CN112307961A (en) * | 2020-10-30 | 2021-02-02 | 魏运 | Method and device for processing hybrid optical fiber intrusion signal |
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| CN112307961A (en) * | 2020-10-30 | 2021-02-02 | 魏运 | Method and device for processing hybrid optical fiber intrusion signal |
| CN112307961B (en) * | 2020-10-30 | 2024-02-20 | 魏运 | Method and device for processing mixed optical fiber intrusion signals |
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