CN106058480B - A kind of any polarized wave generates and calibration method - Google Patents
A kind of any polarized wave generates and calibration method Download PDFInfo
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- CN106058480B CN106058480B CN201610382382.8A CN201610382382A CN106058480B CN 106058480 B CN106058480 B CN 106058480B CN 201610382382 A CN201610382382 A CN 201610382382A CN 106058480 B CN106058480 B CN 106058480B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
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Abstract
The present invention is set and a kind of any polarized wave generates and calibration method, and digital signal is generated in base band, is carried out width to two-way quadrature digital signal and is mutually adjusted and compensate.It is analog signal by digital signal conversion, then up-converts to radiofrequency signal, then pass through the carry out power amplification and distribution of two transmitters, two signals synthesize the polarized wave of arbitrary polarisation direction in orthomode coupler.In the design of polarized signal calibration, a small amount of signal of two-way is coupled out from two-way transmitting signal and enters calibrated channel.The consistency for comparing two channel signals finds two phase minimal differences of polarized signal using optimization algorithm.Compare the difference of two paths of signals, and be fed back to polarized wave and generate unit, the signal of generation is measured and compensated, it is ensured that the consistency of two channel signals.
Description
Technical field
The present invention is applied to DUAL POLARIZATION WEATHER RADAR technical field, not only can produce any polarized electromagnetism using this method
Wave, and polarized electromagnetic wave can be measured and be calibrated, and then improve the precision of polarimetric radar measurement.
Background technique
With successful application of the dual polarization radar in terms of meteorological detection and meteorological particle identification, dual polarization radar is in meteorology
Particle (hail, haze etc.) detection and weather modification field obtain extensive approval and application prospect.Over nearly twenty or thirty year,
Research both at home and abroad and production mechanism carried out in succession the further investigation of polarimetric radar technology, especially polarized wave generate, measurement and
The technologies such as calibration.The radar of report polarization scattering matrix measurement is the DCR radar (1985) of Germany's production earliest.The radar is logical
It crosses four variable phase shifters and two 3dB electric bridges realizes that any polarization generates the function with any cross polarization while transmitting.It is logical
Cross flexible polarizing control, it can be achieved that polarization scattering matrix whole parameter measurements, and can be used for analyzing Stockes vector sum
The measurement of Muller matrix element is the polarimetric radar that function is the most perfect, most complicated so far, but the radar does not include pole
Change calibration unit.
WSR88D Doppler radar net in the U.S. was built up in 1988, in complete upgrading in 2011 be dual polarization thunder
It reaches.The radar implements upgrading by Baron company, using single-emission and double-receiving or the double acceptor systems of double hairs, polarization producing method spirit
It is living, and the calibrating function of radar can be by user's sets itself.Containing two polarization in the upgrading scheme of WSR88D radar
Network, that is, the calibration network of the generation network and polarized signal of polarized signal.When radar emission, pass through high power varying phase shift
Device and 3dB electric bridge realize the generation of any linear polarization, then pass through two waveguides for microwave signal transmission to orthomode coupler
OMT realizes the polarized wave synthesis of transmitting signal.Feeder network used by it is different from domestic previous polarization feeding network,
It is current most advanced flexible polarization production method.
In nearly ten or twenty year, the research of DUAL POLARIZATION WEATHER RADAR has been carried out in domestic several radars research with production unit in succession
And trial production.But the generally existing polarization purity of DUAL POLARIZATION WEATHER RADAR of current domestic development is low and polarization measurement low precision etc. is asked
Topic, results in the erroneous judgement of meteorological particle shape, affects the promotion and application of DUAL POLARIZATION WEATHER RADAR at home.Polarization is caused to survey
Mainly there are two reasons for the error of amount, first is that, the microwave-assisted synthesis that polarimetric radar is all made of high band at present generates polarized wave.
When Microwave Net works in high-frequency and high-voltage environment, microwave device is influenced vulnerable to outside environmental elements, the polarization of two cross polarizations
Purity can change with temperature, environment.Second is that the gain of transmitter power, receiver and noise level can be random at any time
Variation and slowly fluctuating, lead to the unstability of dual polarization radar system.
Traditional any polarized wave generation be by ferrite phase shifter microwave polarization networks, to high transmitting power signal into
Row phase shift and distribution power, then network is synthesized by microwave and forms any polarized wave.This method works in high-power radio frequency ring
Under border, ferrite phase shifter is bulky, is easily acted upon by temperature changes, and causes between polarized wave purity difference, different polarized waves
Isolation is low etc..The present invention works under the low-power environment of numeric field, and phase shifting accuracy is high, and control is flexible, not by environmental condition
Influence.The functions such as the present invention can be realized the agile that polarizes between the arteries and veins of polarized wave, polarity diversity, cross polarization receive, Neng Gouman
Sufficient Stokes vector measurement, Muller matrix measurement, polarizability J, polarization scattering matrix measurement request, can be applied directly to
Polarization generation, feeder line design and polarized signal processing in DUAL POLARIZATION WEATHER RADAR.
Currently, domestic polarized wave generation is to form microwave polarization networks by ferrite phase shifter, signal is carried out continuous
Then phase shift and unequal power distribution form any polarized wave with microwave synthesis network.This method works in radio frequency band, Gao Gong
In the environment of rate, control high-frequency high-power signal is more complicated, and precision is low.Moreover, not only volume is huge for ferrite phase shifter
Greatly, and the influence vulnerable to environment temperature, isolation between polarized wave purity difference caused by causing, different polarized waves is low etc..
In addition, the polarization switching of domestic dual polarization radar also uses ferrite polarization switch.There are the weak of temperature drift for ferrite device
Point, polarization isolation declines rapidly when environmental change.When especially dual polarization emits simultaneously, the difference in two channels causes difference anti-
The measurement error of rate is penetrated up to 4dB or so, is not able to satisfy the error precision requirement of 0.1dB in meteorological detection.
Summary of the invention
Technical problems to be solved
The purpose of the invention is to the one kind for improving the polarization of ele performance of dual polarization radar transmitting and designing is novel
Method.It is easy to control using any polarized wave that the design method generates its advantage is that polarization characteristic is good, not by environment and temperature
The influence etc. of degree.Such as the invention is applied in DUAL POLARIZATION WEATHER RADAR, can be improved the detectivity of polarimetric radar, accurately knows
Not all kinds of meteorological particles and detection forecasting weather.
Technical solution
The polarizing control method of dual polarization radar is devised, it can be control radar transmitting different mode, high-isolation
Polarized wave.The amplitude and phase that two-way polarized signal is adjusted in base band, produce any polarized wave by dual transmitter.For school
The consistency of quasi- polarized signal devises the polarized signal calibration method of reaction type.
1) Polarization changer realizes the control of polarized wave using the high quick change-polarization switch of phase shift.
2) width is carried out to polarized signal in base band mutually to adjust.Two constant amplitudes of I/Q are generated with the letter of phase by signal processor
Number, using phase shifting control network (complex multiplier, mixer, electric bridge etc. form), base band adjustment polarized signal phase and
Amplitude.
3) radiofrequency signal is generated using I/Q modulation, is synthetically produced any polarized wave.Width phase is completed in phase shifting control network
After adjustment, then augment the amplitude phase error that frequency converter and transmitter introduce.Baseband signal is up-converted into tranmitting frequency, by transmitter
After amplification, H, the V port of OMT are respectively enterd, required polarized wave is formed.
4) on-line measurement and calibration are carried out to the amplitude-phase consistency of H, V two paths of signals.Using subtest branch to reception
Channel measures, and by the poor Air conduct measurement amplitude-phase consistency of magic T, quickly finds optimal thermal compensation signal, compensation coupling effect
Answer caused error.Polarization networks are controlled, each branch phase and amplitude of two signal paths is adjusted, generate appointing for optimization
Meaning polarized signal.
A kind of any polarized wave generation, it is characterised in that steps are as follows:
Step 1: generating two-way constant amplitude with the baseband digital signal V1 and V2 of phase；
Step 2: the adjustment of phase is carried out to V1 and V2 two paths of signals, ellipse declining angle e needed for generating elliptically polarised wavejθWith
Oval polar angleThe two paths of signals of output level polarization H and vertical polarization V；
Step 3:H and the equal function of V signal are divided into I/Q two-way, and wherein the i/q signal on the road H passes through width phase adjustment unit A1ejα, V
The i/q signal on road passes through width phase adjustment unit A2ejβ；
Step 4: identical with transmitter frequency by being up-converted to by the i/q signal on the width road H mutually adjusted and the road V
Radiofrequency signal；
Step 5: the signal after up-conversion after adder, filter process, after being amplified by transmitter, divides again through coupler
Not Jin Ru OMT H, V port, OMT synthesis needed for polarized wave.
Carry out the adjustment of phase, the pole in the step 2 to V1 and V2 two paths of signals using polarization wave controller
Changing wave controller successively includes digital phase shifter θ, electronic switch, 90 ° of digital phase shifter, 3dB electric bridge, digital phase shifterWith
3dB electric bridge.
The method that a kind of pair of polarized wave is calibrated, it is characterised in that steps are as follows:
Step 1: two-way transmitting signal is coupled respectively；
Step 2: two-way coupled signal being input to MT, the difference signal of two paths of signals is taken to enter poor channel receiver, and letter
Number ground connection；
Step 3: after difference signal is mixed with local oscillation signal, down-converting to intermediate-freuqncy signal；Intermediate-freuqncy signal is through AD conversion, at sampling
Become digital intermediate frequency difference signal after reason；
Step 4: will be compared after the accumulation of digital intermediate frequency difference signal with given threshold: if the difference signal about sets threshold
Value, by difference signal after DA, filtering, then adjusts the width phase of two channel polarized signals；If difference signal is less than given threshold, say
Bright H, V two paths of signals width mutually meets design requirement.
It is compared in the step 4 using steepest descent method.
Beneficial effect
A kind of any polarized wave proposed by the present invention generates and calibration method, this method modulated signal in baseband signal
Width phase works in the environment of the numeric field of low-power, and flexibly, phase shifting accuracy is high for control, is not influenced by environmental conditions.The present invention
It can be realized the agile that polarizes between the arteries and veins of polarized wave, the functions such as polarity diversity, cross polarization receive, can satisfy the survey of Stokes vector
It measures, Muller matrix measures, the measurement request of polarizability J, polarization scattering matrix.It has the beneficial effect that:
(1) variable power distribution and phase shift are realized using two phase shifters, achievees the purpose that constant amplitude with phase；
(2) in a wherein support arm by waveguide switch select 0 ° or 90 ° of phase shifters, can realize respectively horizontal polarization,
Vertical polarization emits simultaneously and single polarization emission function；
(3) since variable power distribution and variable phase modulation, the invention can produce any polarization；
(4) in polarized wave calibration, by a negative-feedback, control makes amplitude-phase consistency reach best, it can be achieved that real-time pole
Change control；
(5) negative feedback control is oneThe process that minimum value is found in plane, therefore, it is necessary to use steepest decline to calculate
Method achievees the purpose that quickly to control；
(6) using the poor Air conduct measurement amplitude-phase consistency of evil spirit T, rather than the width phase in two channels is directly measured.
Achievement of the present invention can be applied directly in dual polarized weather radar, related ends can also be used for polarization generate,
In the fields such as feeder line design and signal processing and polarized signal processing.If magic T to be replaced with to the transmitting of two same designs
Machine, the technical solution can be applied in the polarimetric radar of dual transmitter system.
Detailed description of the invention
Fig. 1 is polarization controller schematic diagram of the present invention
Fig. 2 is that dual transmitter of the present invention generates any polarized wave schematic diagram
Fig. 3 is polarized wave calibrating principle figure of the present invention
Specific embodiment
Now in conjunction with embodiment, attached drawing, the invention will be further described:
The present invention is the width phase of generation and control polarized signal in the numeric field of base band, and horizontal and vertical polarized
Power amplification and distribution are carried out using two transmitters in two paths, and then synthesizes the polarized wave of arbitrary polarisation direction.?
In the design that any polarized wave generates, firstly, generating two-way quadrature digital signal in a base band, pass through digital phase shifter, electronics
The width phase and polarization characteristic of the devices adjustment two paths of signals such as switch and electric bridge, the polarized signal of output two-way vertically and horizontally.Two
Road polarized signal generates radio frequency polarization signal by the processing such as frequency conversion, filtering, and by two-way transmitter carry out power amplification with
Distribution.Finally, two-way polarized signal synthesizes the polarized wave of arbitrary polarisation direction by orthomode coupler, using waveguide and
Antenna feeder gives off any polarized electromagnetic wave.In polarized signal calibration design, the consistency of two receiving channels is surveyed
Amount.By comparing two receiving branch signals, optimal thermal compensation signal is found, polarized wave is fed back to and generates unit, adjusts and compensates
The road phase and amplitude of two signal paths generates any polarized signal of optimization.
1. any polarized wave generates
Common polarimetric radar includes a high-power transmitter and two channel receiver (respectively horizontal polarization sides
To H receiver and vertical polarization directions V receiver).Transmitter is controlled by the polarization Microwave Net worked in radio frequency environment
Launch horizontal polarized wave or vertically polarized wave, or two kinds of horizontal and vertical simultaneously polarized waves.
Polarization Microwave Net is used to adjust the polarization characteristic of polarized wave and the mode of polarimetric radar work, can be realized radar
The single-shot list of polarized wave is received, single-emission and double-receiving or double hairs pair receive functions.To enable radar to work under a variety of polarization modes, need using
Polarization changer switches over.Polarization changer in the present invention realizes polarized variation using the high quick change-polarization switch of phase shift.
For the isolation of improve the standard polarization and vertical polarization interchannel, two are cascaded again at two output ports of pole-changing Switching
Ferrite high-speed switch.Due to the reverse isolation of ferrite high-speed switch, vertical polarization channel and horizontal polarization channel are realized
Isolation be up to 45dB, the isolation between small-power state lower channel is up to 60dB or more.
Currently, polarized wave is generated usually using a transmitter, in order to reach stable output power, the usual work of transmitter
Make in the saturated condition.The radiofrequency signal of transmitting is divided into two-way via magic T (MT), in polarization Microwave Net adjustment section polarized wave
Polarized state.In general, polarization Microwave Net is by MT, phase shifter, microwave switch, electric bridge, orthomode coupler (OMT) and auxiliary function
The compositions such as energy circuit.
Polarization Microwave Net is used to adjust the width phase and polarization wave mode of polarized signal.The radar signal branch function through MT point
It is synthesized using 3dB electric bridge after mutually being adjusted by analog phase shifter progress width at two-way and is discharged flat polarization direction H and vertical pole
Change the two-way polarized signal of direction V.As θ andWhen continuously adjustable, two-way both horizontally and vertically H, V polarized wave is exported, through just
Required elliptically polarised wave is synthesized after handing over coupler OMT.Adjust θ andSize, control elliptical inclination angle and major and minor axis
Ratio can produce arbitrary ellipse polarized wave.If the upper arm of MT uses a waveguide switch to control 90 ° of phase shifters again, when waveguide is opened
When closing 0 ° of phase shift of selection, H, V polarized signal of the constant amplitude with phase can produce, so that generating horizontal simultaneously, vertical polarization emits signal.
When waveguide switch selects 90 ° of phase shifts, all transmission powers can be made to fully enter the channel H, to generate horizontal polarization transmitting
Signal.The simplified pinciple figure of the above method is as shown in Figure 1.If this method works under radio frequency environment the width for adjusting polarized signal
Meet Shortcomings because the phase and amplitude of radio frequency transmissions is difficult to control, will lead to polarized wave polarization precision it is low and
Isolation is low, and polarisation error error is big.
In the above method, the effect of MT is the power for distributing two paths of signals.If replacing above-mentioned side using two transmitters
MT in method, is equally able to achieve power distribution.And the function that radio frequency polarization signal can be adjusted to width phase is shifted in low-power
It is realized in baseband signal.The width that polarized signal is adjusted in baseband signal mutually has the advantages that in numeric field using number electricity
Road controls the width phase of polarized signal, and control mode is flexible, and precision is high；Phase shift does not need high power device under low power scenarios,
It is easy to produce any polarized wave.
Using the method for two transmitters there is also deficiency, need to improve.For example, transmitter work is in linear work shape
State can cause the working efficiency of transmitter and output power that can decline, and need to carry out width phase control in digital signal processor.
In addition, the difference of two-way transmitter can bring the disequilibrium of amplitude and phase, correction two-way polarization is also corrected by phase shift
The difference of signal.Taking into account the above, based on digitlization phase shift and dual transmitter technology, the present invention devises a kind of any polarization of generation
The method of wave.Its principle is as shown in Figure 2, and work step is as follows:
1) in baseband signal, two constant amplitudes are digitally generated with the signal V1 and V2 of phase, referring to fig. 2 in A1 it is flat
Face；
2) between A1 and A2 plane, V1 and V2 two paths of signals is by two digital phase shifters, two 3dB electric bridges and 90 °
Digital phase shifter (polarized wave of P1 and P2 interplanar controls network as shown in figure 1) output two-way H, V polarized signal, two-way H, V
Polarized signal is for synthesizing elliptically polarised wave.In the process, elliptically polarised wave can be changed in adjustment ellipse declining angle and oval polar angle
Any polarized state, wherein ejθFor adjusting ellipse declining angle,For adjusting oval polar angle；
3) when exporting from A2 plane, required elliptic polarization wave parameter has been formed, and H, V two-way polarized signal distinguish function
It is divided into I/Q two-way, carries out I/Q orthogonal transformation.
4) H, V two paths of signals can cause the difference of two-way i/q signal, while two transmitters after function divides I/Q two-way respectively
There is also difference, the inconsistent errors that can cause to generate elliptically polarised wave of two branches in width phase.Thus in two support arms
It is upper to have concatenated a width phase adjustment unit A respectively1ejαAnd A2ejβ, to compensate two branch width phase mismatches.This stage adjustment polarization letter
Number width mutually still work in baseband signal, realize in the digital domain.A1ejαAdjust the I/Q amplitude phase error in the channel H, A2ejβAdjustment
The I/Q amplitude phase error in the channel V.
5) it after completing width phase mismatch compensation, in A3 plane, is mutually missed including I/Q quad upconverter with the width that transmitter introduces
Difference is increased by complete mend.Baseband signal is upconverted into tranmitting frequency by I/Q upconverter, digital signal becomes radiofrequency signal.
6) again after adder, filter process, after polarized signal is amplified by transmitter, OMT is respectively enterd through coupler
H, V port, synthesize required elliptically polarised wave.
7) in order to the progress on-line measurement of H, V amplitude-phase consistency.One is coupled in the output end (A5 plane) of each transmitter
Fraction emitted energy enters in two-channel receiver.If the amplitude phase error of transmitter is it often fully compensated, it is input to
The amplitude phase error of receiver just represents the amplitude phase error of H, V.It is exported from receiver and introduces negative-feedback to ejθ、Link can
The purity of elliptic polarization is measured and be adjusted.
2. any polarized wave calibration
Surely floating, environment change etc. due to, the amplitude-phase consistency in two channel H, V can be destroyed, and need to readjust
Width phase θ,There are two ways to consistency of adjustment and measurement width phase.A kind of method is using two-way receiver to width phase one
Cause property measures, and this method can bring measurement error due to the inconsistency of receiver itself.Another method is using coupling
The difference that a MT detects two signals is reused after clutch.According to the characteristic of MT, when two-arm constant amplitude is with phase, difference signal 0.Due to
It detects difference signal and is easier than detection constant amplitude with the signal of phase, receiver is used to calibrate H, V two all the way so needing in addition design
Road polarized wave.The target that width mutually adjusts is that the signal difference output of receiver reaches minimum.
Due to coupling effect, when adjusting amplitude or phase, another parameter is also with variation.The output of poor reception machine is two
Tie up functionTo make functionReach minimum, needing to find Optimal Control path using steepest descent method makes
Minimization goes the phase and amplitude of calibration H, V polarized signal by the negative-feedback that signal two-way difference is formed.In conclusion double
Any polarized wave calibration method in channel is as shown in Figure 3.The method steps are as follows:
1) a small amount of transmitting signal is coupled out through coupler respectively by two-way transmitting signal；
2) two paths of signals enters MT, and the difference signal of two paths of signals is taken to enter poor channel receiver and signal ground；
3) difference signal down-converts to intermediate-freuqncy signal with after local oscillation signal Frequency mixing processing.Intermediate-freuqncy signal through AD conversion, sampling at
Become digital intermediate frequency difference signal after reason.
4) digital intermediate frequency difference signal input signal processor is calibrated.It is carried out after difference signal accumulated process with given threshold
Compare.If the difference signal is less than given threshold, illustrate that H, V two paths of signals difference meet design requirement.If the difference signal
Polarization controller is fed back to by difference signal after the processing such as DA, filtering greater than given threshold.Two channel polarized signals are adjusted again
Width phase.The difference signal for comparing two-way through the above process again meets given threshold until difference signal is sufficiently small.Compare in circulation
In, it is optimized and is compared using steepest descent method.
Claims (3)
1. a kind of any polarized wave production method, it is characterised in that steps are as follows:
Step 1: generating two-way constant amplitude with the baseband digital signal V1 and V2 of phase；
Step 2: the adjustment of phase is carried out to V1 and V2 two paths of signals, ellipse declining angle e needed for generating elliptically polarised wavejθAnd ellipse
Polar angleThe two paths of signals of output level polarization H and vertical polarization V；
Step 3:H and the equal function of V signal are divided into I/Q two-way, and wherein the i/q signal on the road H passes through width phase adjustment unit A1ejα, the road V
I/q signal passes through width phase adjustment unit A2ejβ；
Step 4: will up-convert to radio frequency identical with transmitter frequency by the i/q signal on the width road H mutually adjusted and the road V
Signal；
Step 5: the signal after up-conversion is again after adder, filter process, after being amplified by transmitter, through coupler respectively into
H, the V port for entering orthomode coupler OMT, the polarized wave needed for OMT synthesis；
Carry out the adjustment of phase, the polarized wave in the step 2 to V1 and V2 two paths of signals using polarization wave controller
Controller successively includes digital phase shifter θ, electronic switch, 90 ° of digital phase shifter, 3dB electric bridge, digital phase shifterWith 3dB electricity
Bridge.
2. the method that the polarized wave that a kind of pair of claim 1 generates is calibrated, it is characterised in that steps are as follows:
Step 1: two-way transmitting signal is coupled respectively；
Step 2: two-way coupled signal being input to magic T MT, the difference signal of two paths of signals is taken to enter poor channel receiver, and letter
Number ground connection；
Step 3: after difference signal is mixed with local oscillation signal, down-converting to intermediate-freuqncy signal；Intermediate-freuqncy signal is through modulus AD conversion, at sampling
Become digital intermediate frequency difference signal after reason；
Step 4: it will be compared after the accumulation of digital intermediate frequency difference signal with given threshold: if the difference signal about given threshold,
By difference signal after digital-to-analogue DA, filtering, then adjust the width phase of two channel polarized signals；If difference signal is less than given threshold,
Illustrate that H, V two paths of signals width mutually meet design requirement.
3. calibration method according to claim 2, it is characterised in that compared in the step 4 using steepest descent method
Compared with.
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| EP3451542B1 (en) | 2016-11-25 | 2023-06-14 | Huawei Technologies Co., Ltd. | Polarization-based phased array transmitter, mobile terminal |
| CN106849994B (en) * | 2016-12-12 | 2018-11-23 | 西安空间无线电技术研究所 | A kind of Frequency Hopping Signal polarity diversity merging method |
| CN108241096A (en) * | 2016-12-26 | 2018-07-03 | 联芯科技有限公司 | The test method and device of a kind of phase-shift circuit, phase shifter and radiance |
| CN107947740A (en) * | 2017-12-04 | 2018-04-20 | 中国电子科技集团公司第四十研究所 | A kind of ultra wide band high stability I/Q modulator circuit and modulator approach |
| CN108445305B (en) * | 2018-03-13 | 2023-06-23 | 南京信息工程大学 | Electronic downtilt angle detection system and method for mobile base station antenna |
| CN108682965B (en) * | 2018-05-21 | 2020-09-29 | 成都迪优联科技有限公司 | Digital domain polarization reconstruction system and method for active antenna |
| CN109286080B (en) * | 2018-10-23 | 2021-01-12 | 北京无线电测量研究所 | Polarization device |
| CN109818596B (en) * | 2019-01-29 | 2021-03-12 | 中国科学院上海微***与信息技术研究所 | Multi-channel radio frequency signal waveform and phase accurate control circuit |
| CN112003001B (en) * | 2020-08-12 | 2022-01-11 | 上海交通大学 | Omnidirectional dual-circular polarization based phased random multi-polarization antenna and multi-polarization channel communication system |
| CN113176453A (en) * | 2021-03-30 | 2021-07-27 | 上海机电工程研究所 | Array type multi-channel arbitrary polarization signal generation method and system |
| CN113985377A (en) * | 2021-12-24 | 2022-01-28 | 清华大学 | High-isolation radar polarization signal simulation method, device, equipment and medium |
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| DE102006029317A1 (en) * | 2006-06-23 | 2007-12-27 | Selex Sistemi Integrati Gmbh | Polarization modulated transmitter |
| CN101728600A (en) * | 2008-10-28 | 2010-06-09 | 西安恒达微波技术开发公司 | Waveguide high-power polarized state change-over switch |
| CN101957444B (en) * | 2010-09-30 | 2012-08-01 | 中国船舶重工集团公司第七二三研究所 | Multichannel radar amplitude and phase automatic correcting method and device |
| CN202351424U (en) * | 2011-12-12 | 2012-07-25 | 南京恩瑞特实业有限公司 | Meteorological radar polarization switch assembly |
| CN103916343B (en) * | 2012-12-28 | 2017-07-11 | 北京中电华大电子设计有限责任公司 | A kind of IQ disequilibrium regulating method and apparatus for WLAN devices |
| CN104064872B (en) * | 2014-06-10 | 2017-01-11 | 北京遥测技术研究所 | Active polarized tracker in high-accuracy low-noise Ku frequency band |
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