CN107367774A - A kind of sounding system processing unit for Beidou navigation - Google Patents
A kind of sounding system processing unit for Beidou navigation Download PDFInfo
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- CN107367774A CN107367774A CN201710416530.8A CN201710416530A CN107367774A CN 107367774 A CN107367774 A CN 107367774A CN 201710416530 A CN201710416530 A CN 201710416530A CN 107367774 A CN107367774 A CN 107367774A
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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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- 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
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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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Abstract
The present invention disclose be used for Beidou navigation sounding system processing unit, including be 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 process plate, the analog down process plate is converted into analog if signal to sonde radiofrequency signal processing and sent to the self-adaptive numerical integration algorithm process plate, the self-adaptive numerical integration algorithm process plate carries out AF panel to the analog if signal, and exports for sonde signal resolution.The sounding system processing unit for being used for Beidou navigation overcome it is of the prior art can only handle an instrument simultaneously, and jamproof function can not be realized, ensure that beam angle meets that lateral precision requires for 3 degree.
Description
Technical field
The present invention relates to the radar exploration technique field, in particular it relates to the sounding system processing unit for Beidou navigation.
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 discharges, simultaneously because the electromagnetic environment of sounding is also more next complicated, is brought greatly to detection performance of the ground in face of sonde
Challenge.
At this stage, Beidou navigation needs to use radar to send signal, it is necessary to be transmitted signal processing.But existing rank
The beam switchover technology of section is the antenna using beam switchover mode, is typically made up of 7 beam antennas, 6 wave beam days of level
60 ° of line angle degree, one wave beam of zenith, so generally less.
Typically at work, for an instrument, in numerous antennas, only a beam antenna is in order at working condition.
When user changes, or customer location shifts, antenna system can according to circumstances change beam antenna sensing, that is, the ripple before cutting off
Beam antenna, the correct beam antenna of another angle is then allowed to work on.But the technology still can only handle an instrument simultaneously,
And anti-interference function can not be realized, it is unfavorable for popularization and application.
The content of the invention
It is an object of the invention to provide a kind of sounding system processing unit for Beidou navigation, this is used for Beidou navigation
Sounding system processing unit overcome it is of the prior art can only handle an instrument simultaneously, and jamproof function can not be realized,
Ensure that beam angle meets lateral precision for 3 degree of requirements.
To achieve these goals, the invention provides a kind of sounding system processing unit for Beidou navigation, the spy
Empty set system processing unit is including being sequentially connected with lower module：Seven array element array antennas, analog down process plate and adaptive
Digital beam froming process plate；Wherein, the seven array element array antenna sends the sonde radiofrequency signal received to described
Analog down process plate, the analog down process plate are converted into analog intermediate frequency letter to sonde radiofrequency signal processing
Number and send to the self-adaptive numerical integration algorithm process plate, the self-adaptive numerical integration algorithm process plate is to the simulation
Intermediate-freuqncy signal carries out AF panel, and exports for sonde signal resolution.
Preferably, the seven array element array antenna includes：Seven circular polarized antennas, seven circular polarized antennas composition are 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 amplifies to obtain 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 samples mould
Block, channel correcting module, aspect resolve module, AF panel module and D/A converter module；Wherein, the AD samplings mould
Analog if signal sample conversion is digital medium-frequency signal by block；The channel correcting module carries out signal to digital medium-frequency signal
Correction；The aspect resolves module and carries out direction finding and tracking to multiple sondes using MUSIC algorithms；The interference suppression
Molding block to useless interference signal using when Combined Treatment rectangular projection class algorithm carry out Adaptive Suppression obtain signal C, and
Form multi-beam directional diagram and detect multiple instrument；Signal C is converted into analog if signal and by described in by the D/A converter module
Analog if signal is exported for sonde signal resolution.
Preferably, high-performance narrow band filter is provided with before the low-noise amplifier.
Preferably, the AD sampling modules use High-Speed Double-Channel A-D converter.
By above-mentioned embodiment, overcome it is of the prior art can only handle an instrument simultaneously, and can not realize anti-
The function of interference, using seven array-element antenna Array Designs, ensure that beam angle meets lateral precision for 3 degree of requirements, beneficial to visiting
The maximum matching of empty instrument signal receives, beneficial to popularization and application.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is for providing a further understanding of the present invention, and a part for constitution instruction, 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 the system structure diagram for illustrating a kind of sounding system processing unit for Beidou navigation of the present invention；
Fig. 2 illustrates that a kind of seven array-element antenna arrays of sounding system processing unit for Beidou navigation of the present invention utilize
The 3D illustratons of model of HFSS simulation softwares construction；
Fig. 3 illustrates a kind of seven array-element antenna array voltages of sounding system processing unit for Beidou navigation of the present invention
Standing-wave ratio (VSWR) figure；
Fig. 4 illustrates a kind of antenna element center frequency point of sounding system processing unit for Beidou navigation of the present invention
Gain pattern；
Fig. 5 illustrates that a kind of analog down process plate of sounding system processing unit for Beidou navigation of the present invention is penetrated
Frequency component single channels theory diagram；
Fig. 6 illustrates a kind of intermediate-frequency filter performance simulation of sounding system processing unit for Beidou navigation of the present invention
Figure；
Fig. 7 illustrates a kind of adaptive digital wave beam processing of sounding system processing unit for Beidou navigation of the present invention
Plate design framework figure；
Fig. 8 illustrates data message before a kind of channel correcting for the sounding system processing unit of Beidou navigation of the invention
Figure；
Fig. 9 illustrates data message after a kind of channel correcting for the sounding system processing unit of Beidou navigation of the invention
Figure；
Figure 10 illustrates a kind of 2 sonde letters of presence of sounding system processing unit for Beidou navigation of the present invention
Number, 3 incoherent interference signal treatment effect figures；
Figure 11 illustrates a kind of 2 sonde letters of presence of sounding system processing unit for Beidou navigation of the present invention
Number, 4 incoherent interference signal treatment effect figures；
Figure 12 illustrates a kind of 3 sonde letters of presence of sounding system processing unit for Beidou navigation of the present invention
Number, 5 incoherent interference signal treatment effect figures；And
Figure 13 illustrates a kind of 3 sonde letters of presence of sounding system processing unit for Beidou navigation of the present invention
Number, 6 incoherent interference signal treatment effect figures.
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 provide a kind of sounding system processing unit for Beidou navigation, the sounding system processing unit including according to
Secondary connection with lower module：Seven array element array antennas, analog down process plate and self-adaptive numerical integration algorithm process plate；Its
In, the seven array element array antenna sends the sonde radiofrequency signal received to the analog down process plate, described
Analog down process plate is converted into analog if signal to sonde radiofrequency signal processing and sent to described adaptive
Digital beam froming process plate, the self-adaptive numerical integration algorithm process plate carry out interference suppression to the analog if signal
System, and export for sonde signal resolution.
By above-mentioned embodiment, overcome it is of the prior art can only handle an instrument simultaneously, and can not realize anti-
The function of interference, using seven array-element antenna Array Designs, ensure that beam angle meets lateral precision for 3 degree of requirements, beneficial to visiting
The maximum matching of empty instrument signal receives, beneficial to popularization and application.
In a kind of embodiment of the present invention, the seven array element array antenna can include：Seven circular polarisation days
Line, seven circular polarized antennas form 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.
Seven array-element antenna Array Designs include seven circular polarized antennas, and the mode of structuring the formation is uniform surface battle array, seven independent array elements
Each other away from for half-wavelength.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
The sonde radiofrequency signal is amplified to obtain 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 wave filter as small as possible should be selected with, system front end wave filter, and in order to reduce the volume of system and
It is easy to integrate, selection is SAW filter, and it is with interior Insertion Loss≤3dB.For circuit rear class filtering device, filtered using LC
Device, its feature are 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 controls noise coefficient, 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 that input signal is converted into intermediate frequency by analog radio-frequency signal by mixing.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 with local-oscillator leakage to radio-frequency 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, after improving the link linearity
LC schemes are selected.
In this kind of embodiment, 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, it is described
Analog if signal sample conversion is digital medium-frequency signal by AD sampling modules；The channel correcting module is to digital medium-frequency signal
Carry out signal correction；The aspect resolves module and carries out direction finding and tracking to multiple sondes using MUSIC algorithms；It is described
AF panel module to useless interference signal using when Combined Treatment rectangular projection class algorithm carry out Adaptive Suppression obtain letter
Number C, and form multi-beam directional diagram and detect multiple instrument；Signal C is converted into analog if signal simultaneously by the D/A converter module
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.Sampled in rising edge clock, 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 owns
Index all meets design requirement, and built-in reference voltage and sampling hold circuit, peripheral circuit are simple.Analog signal input is adopted
With Differential Input pattern.The radio frequency input and output voltage that Differential Input is selected using transformer is than 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 provides.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 caused 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 opened using characteristic vector corresponding to small characteristic value into noise subspace and signal guide vector
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 of signal and noise 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, define 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 decomposes 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 is completely heavy
Folded, the number of signal characteristic value will be reduced.
After carrying out Eigenvalues Decomposition to covariance, obtained characteristic value meets relation
λ1≥λ2≥…≥λP≥λP+1=...=λM=σ2 (3)
Understood according to formula (2) and formula (3), all big characteristic values, may be expressed as linear group of each signal power
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 is very close with noise power, and then influences the accurate judgement of big characteristic value number and the accurate estimation to signal 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, 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 smaller or when incoming signal spatial correlation is larger in the power of incoming signal, the less spy in part in big characteristic value
Value indicative can be much larger than noise power, ensure that accurate judgement of the algorithm to signal number, improve algorithm and direction of arrival is estimated
Count performance.
After carrying out Eigenvalues Decomposition to covariance, the signal subspace of characteristic vector corresponding to all big characteristic values is obtained
Space US-st∈CMK×PWith all small characteristic values corresponding to characteristic vector noise subspace UN-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 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)
By 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
The then output of array is
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.
In this kind of embodiment, high-performance narrow band filter is provided with before the low-noise amplifier.
In this kind of embodiment, the AD sampling modules use High-Speed Double-Channel A-D converter.
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 (8)
- A kind of 1. sounding system processing unit for Beidou navigation, it is characterised in that the sounding system processing unit include according to Secondary connection with lower module：Seven array element array antennas, analog down process plate and self-adaptive numerical integration algorithm process plate；Its In, the seven array element array antenna sends the sonde radiofrequency signal received to the analog down process plate, described Analog down process plate is converted into analog if signal to sonde radiofrequency signal processing and sent to described adaptive Digital beam froming process plate, the self-adaptive numerical integration algorithm process plate carry out interference suppression to the analog if signal System, and export for sonde signal resolution.
- 2. the sounding system processing unit according to claim 1 for Beidou navigation, it is characterised in that seven array element Array antenna includes：Seven circular polarized antennas, seven circular polarized antennas form uniform surface battle array.
- 3. the sounding system processing unit according to claim 2 for Beidou navigation, it is characterised in that seven circles The spacing of two neighboring circular polarized antenna is half-wavelength in poliarizing antenna.
- 4. the sounding system processing unit according to claim 3 for Beidou navigation, it is characterised in that six circular polarisation Antenna is uniformly distributed in on the circle of a length of radius of the half-wave；It is in place that a remaining circular polarized antenna is arranged in center of circle institute Put.
- 5. the sounding system processing unit according to claim 3 for Beidou navigation, it is characterised in that under the simulation Frequency-conversion processing plate is including being sequentially connected with lower component：Low-noise amplifier, analog filter and analog down converter；Wherein, The low-noise amplifier receives the sonde radiofrequency signal, and the sonde radiofrequency signal amplified to obtain signal A, institute State the sonde radiofrequency signal after analog filter filtering amplification and obtain signal B；The analog down converter turns signal B Turn to analog if signal.
- 6. the sounding system processing unit according to claim 3 for Beidou navigation, it is characterised in that described adaptive Digital beam froming 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, analog if signal sample conversion is number by the AD sampling modules Word intermediate-freuqncy signal；The channel correcting module carries out signal correction to digital medium-frequency signal；The aspect resolves module profit Direction finding and tracking are carried out to multiple sondes with MUSIC algorithms；The AF panel module joins when being utilized to useless interference signal The rectangular projection class algorithm progress Adaptive Suppression for closing processing obtains signal C, and forms multi-beam directional diagram and detect multiple instrument；Institute D/A converter module is stated signal C is converted into analog if signal and exports the analog if signal for sonde signal Parsing.
- 7. the sounding system processing unit according to claim 5 for Beidou navigation, it is characterised in that in the low noise High-performance narrow band filter is provided with before acoustic amplifier.
- 8. the sounding system processing unit according to claim 6 for Beidou navigation, it is characterised in that the AD samplings Module uses High-Speed Double-Channel A-D converter.
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| CN108519608A (en) * | 2018-03-09 | 2018-09-11 | 中国航天电子技术研究院 | A kind of satellite navigation based on array antenna is anti-interference and surveys attitude positioning method |
| CN110208829A (en) * | 2019-03-21 | 2019-09-06 | 西安电子科技大学 | A kind of navigational communications anti-interference method |
| 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 |
| CN114002758A (en) * | 2021-11-05 | 2022-02-01 | 北京航天驭星科技有限公司 | Sonde transceiver |
| CN114002758B (en) * | 2021-11-05 | 2022-06-24 | 北京航天驭星科技有限公司 | Sonde transceiver |
| RU2805163C1 (en) * | 2022-09-09 | 2023-10-11 | Общество с ограниченной ответственностью "Научно-производственное предприятие "ОРТИКС" | Navigation and radar system for atmosphere radio sounding |
| CN116915318A (en) * | 2023-09-13 | 2023-10-20 | 中科星图维天信科技股份有限公司 | Aerial electric field receiving method and system based on Beidou satellite |
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