CN106093893B - A kind of online calibration method of any polarized wave of dual polarization radar - Google Patents
A kind of online calibration method of any polarized wave of dual polarization radar Download PDFInfo
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- CN106093893B CN106093893B CN201610383302.0A CN201610383302A CN106093893B CN 106093893 B CN106093893 B CN 106093893B CN 201610383302 A CN201610383302 A CN 201610383302A CN 106093893 B CN106093893 B CN 106093893B
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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
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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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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- 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
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
- G01S7/406—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder
- G01S7/4065—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder involving a delay line
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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
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Abstract
The present invention is set and a kind of any polarized wave online calibration method of dual polarization radar, and polarization calibration channel is made of Digital Calibration unit, digital to analog converter, frequency converter, calibration loudspeaker, main Feed Horn and receiving channel.Digital Calibration unit is substantially an arbitrary waveform generator, can produce continuous wave sinusoidal signal, noise signal, Any Digit waveform and the delay for emitting signal copy of standard.Polarimetric radar works in calibration mode, is coupled out a small amount of signal as the copy to transmitting signal from the output end of transmitter.Digital signal is converted to after the operations such as the signal is downconverted, filtering and ADC transformation, is input in Digital Calibration unit as digitlization transmitting sampled signal.After numeric field carries out the conversion process such as amplitude, phase, frequency spectrum, delay to the signal, reconvert to analog signal, by upconverting to radiofrequency signal by demarcating loudspeaker to main feed source loudspeaker radiation.
Description
Technical field
The present invention is applied to DUAL POLARIZATION WEATHER RADAR technical field, is capable of any polarized wave of real-time calibration using this method
State and characteristic, and then improve the precision of polarimetric radar measurement.
Background technique
The main application of polarimetric radar is target identification, and technical foundation is that radar measures the polarization characteristic of target, packet
Include the analysis and measurement to target polarization scattering matrix, polarization of ele parameter.As dual polarization radar is gentle in meteorological detection
As the successful application in terms of particle identification, dual polarization radar is in meteorological particle (hail, haze etc.) detection and weather modification neck
Domain obtains extensive approval and application prospect.
In recent years, research both at home and abroad and production mechanism have carried out the further investigation of polarimetric radar technology, especially pole in succession
Change the technologies such as wave generation, measurement and calibration.The radar of report polarization scattering matrix measurement is the DCR radar of Germany's production earliest
(1985).The radar realizes that any polarization generates and any cross polarization by four variable phase shifters and two 3dB electric bridges
The function of transmitting simultaneously.By flexible polarizing control, it can be achieved that whole parameter measurements of polarization scattering matrix, and can be used for
The measurement for analyzing Stockes vector sum Muller matrix element, is the polarization thunder that function is the most perfect, most complicated so far
It reaches, but the radar does not include polarization 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 line polarization wave, then pass through two waveguides for microwave signal transmission to orthogonal mode coupling
Device realizes that the polarization of transmitting signal generates.Polarized signal demarcates network for the test and calibration to polarization radar performance.
Nearly ten years, domestic Ji Jia radar research institution and production unit have carried out the research of DUAL POLARIZATION WEATHER RADAR in succession
And trial production.But the problem of DUAL POLARIZATION WEATHER RADAR of current domestic development generally existing polarization measurement low precision, result in gas
As the erroneous judgement of particle shape, the promotion and application of DUAL POLARIZATION WEATHER RADAR at home are affected.Cause the error master of polarization measurement
It will be there are two reason, first is that the polarization purity of the polarized wave of transmitting is inadequate.The country generallys use ferrite device and reconciles radio-frequency pole
Change the phase and amplitude of wave, which is difficult to ensure the polarization characteristic of polarized wave, and influences vulnerable to factors such as temperature, environment.Two
Be radar system itself stability it is inadequate, the consistency in two channels is insufficient.Radar transmitter power, receiver gain and make an uproar
Vocal level can change at random at any time and slowly rise and fall.
In order to reduce the measurement error of radar, DUAL POLARIZATION WEATHER RADAR needs to demarcate system before normal work,
Therefore, Radar Calibration technology is come into being.The transmitter and receiver online calibration method of ordinary radar has reached its maturity, but double
The on-line proving technology of polarimetric radar is at present still in theory study and engineering experiment stage.
In Radar Design, a Radar Calibration unit is specially devised in radar emission and receiving front-end.Radar Calibration list
Member is the built-in test system of radar, its effect is to generate Radar Calibration signal.It is right in the case where not by external meters
Radar system design parameter is carried out in X -ray inspection X and test.It includes: the noise system of receiver that radar, which needs the major parameter demarcated,
Several, receiver dynamic range and the linearity, improvement factor, the power of transmitter etc..When measuring improvement factor, need transmitter
Pulse copy (being coupled out a small amount of signal from transmitter) be injected into receiver front end, radar complete machine improvement factor is surveyed
Examination.Radar is assessed and is measured to Doppler measurement accuracy and speed spectrum width by calibration.In addition, being connect to dual-polarized pair
In the radar for receiving body, the amplitude-phase consistency to two receiving channels is needed to demarcate.
It realizes above-mentioned calibration test, needs Design assistant Calibration Circuit and corresponding signal processing algorithm in radar,
These auxiliary calibration circuits and Algorithm constitution Radar Calibration unit.Traditional calibration unit is made of analog device, including is made an uproar
Sound source, continuous baud generator, radio-frequency delay line and attenuator etc., wherein delay line can use ultrasonic delay line or fibre delay line
Composition.The test of above-mentioned partial parameters can only be realized by these units that analog device forms, for example, in U.S.'s WSR88D radar
Calibration unit can only on-line testing receiver noise factor, dynamic range, the linearity, limit improvement factor, Doppler measurement
Deng.Usage of the WSR88D Radar Calibration unit in radar is as shown in Figure 1.
The demarcation signal of WSR88D Radar Calibration unit is coupled into receiver front end through T/R switch by directional coupler, real
Now to the injection of demarcation signal.By the unlatching and closure to noise source, the noise coefficient of receiver is tested.Continuous wave
Source generates continuous wave sinusoidal signal, carries out on-line testing by dynamic range and the linearity of the attenuator control to receiver.It penetrates
Frequency delay line is used to postpone the copy signal that transmitter is coupled out, and is injected into receiver, passes through unlatching
Or the Doppler filter of shutdown signal processor to carry out on-line testing and assessment to radar limit improvement factor.
WSR88D Radar Calibration unit is simulated calibration unit, and the generally existing some disadvantages of simulated calibration unit.First,
Influence of the simulation system vulnerable to variation of ambient temperature, attenuation cannot be controlled accurately, when especially attenuation steps are less than 1dB,
Error is bigger.Second, radio-frequency delay line signal can only be fixed delay, and the delay of any time cannot be carried out to signal,
Thus signal processor can not be examined to test the deblurring function of multiecho.Third, traditional simulated calibration unit
Radiofrequency signal cannot be modulated, such as increase Doppler frequency shift, decay by distance to signal amplitude.4th, it is traditional
Simulated calibration unit cannot control signal noise ratio.5th, traditional demarcation signal is injected by directional coupler
In receiver, the variation of receiver can only be measured, the channel error including feed, feeder line cannot be tested.
Radar needs to demarcate the parameters of radar system before work.Radar Calibration is usually using different marks
Determine signal to detect the various parameters such as transmitter, receiver.And the calibration of DUAL POLARIZATION WEATHER RADAR marked ratio ordinary radar is more
For complexity, other than using conventional demarcation signal, DUAL POLARIZATION WEATHER RADAR often emits not same polarization demarcation signal, with detection
The polarization performance of radar system.These demarcation signals are applied not only to the time of detection radar emission signal, frequency spectrum, power, polarization
The parameters such as performance, and be used to detect and demarcate receiver performance, as dynamic range, clutter recognition, improvement factor, noise are special
Sign, the consistency in two channels etc..
Currently, domestic transmitter and receiver online calibration method has reached its maturity, but the polarized wave calibration of polarimetric radar
At present still in exploration and engineering experiment stage.For this purpose, the present invention devises a kind of method to the calibration of any polarized wave, it can be real
Now emit, receive the self calibrating function of system.The invention is for can be improved the detection energy of radar in DUAL POLARIZATION WEATHER RADAR
Power accurately identifies all kinds of meteorological particles and detection forecasting weather.
Summary of the invention
Technical problems to be solved
The purpose of the invention is to improve and detect the performance of dual polarization radar system, it is double to devise a kind of on-line proving
A kind of method of Changeable Polarization Radar System parameter and polarization performance.Various demarcation signals are exported to radar system by Digital Calibration unit
System carries out on-line proving, detects the system parameter and working condition of radar, and presets the running parameter before radar normally detects.
Technical solution
A kind of any polarized wave online calibration method of dual polarization radar, it is characterised in that steps are as follows:
Step 1: radar works under calibration mode, is coupled out by coupler in transmitter output end and emits signal frequency
Compose copy signal identical with phase property；
Step 2: intermediate-freuqncy signal is obtained after copy signal is mixed with local oscillation signal, intermediate-freuqncy signal carries out number through ADC and adopts
Sample is converted into digital signal；
Step 3: digital signal after DDC Digital Down Convert be baseband signal, baseband signal after complex demodulation is handled,
Form transmitting signal copy i/q signal；
Step 4: transmitting signal copy i/q signal being input in Digital Calibration signal processor, to transmitting signal copy
I/q signal is modulated and postpones；The various calibration signal root that postpones signal and Digital Calibration signal processor itself are generated
Selection output is carried out according to performance parameter to be detected；The wherein various calibration signal, including standard sine wave signal, white noise
Signal, spectrum signal and Any Digit waveform signal；
Step 5: the output signal of Digital Calibration signal processor becomes simulation letter through orthogonal transformation, adder and DAC
Number, it is divided into two paths of signals using the laggard infatuated T of up-conversion, inputs the amplitude and phase of microwave polarization controller adjustment signal respectively
Position generates required two-way H, V polarization demarcation signal；The microwave polarization controller includes phase shifter, electric bridge and electronic cutting
It closes；
Step 6:H, V polarization demarcation signal synthesizes the calibration polarized wave of any polarization characteristic all the way by OMT, into installation
In the calibration loudspeaker of aerial head, to main feed source loudspeaker radiation；
Step 7: the main received demarcation signal of Feed Horn enters two-way radar receiver through OMT, waveguide and circulator again,
It is finally input into radar signal processor, and is shown on terminal organ, to detect the performance ginseng of radar transmitter and receiver
Number, completes entire polarized signal on-line proving process.
The related method thereof used in step 4: it realizes that the digital delay of random length is controlled using memory length is changed, prolongs
When duration depend on memory capacity.
Beneficial effect
Any polarized wave online calibration method of a kind of dual polarization radar proposed by the present invention, with calibration side in existing machine
The main distinction of method is: replacing simulated calibration unit to generate demarcation signal with Digital Calibration unit, and devises auxiliary calibration
Loudspeaker, by auxiliary calibration loudspeaker by demarcation signal to the main feed source radiation of antenna.Meanwhile utilizing the reception of radar system itself
Function and polarization process function carry out on-line measurement and calibration to the consistency in two-way polarization radar channel.
The present invention is the Digital Realization demarcated in radar machine, can replace existing simulated calibration unit.In addition to can be with
Outside the repertoire for realizing simulated calibration unit, the irrealizable function of simulated calibration unit can also be realized, these function packets
It includes: generating random waveform signal, Gaussian spectrum signal, any polarized signal, modulate emission signal copy.The present invention can be direct
It is applied in DUAL POLARIZATION WEATHER RADAR, improves the control of polarization radar wave, the processing of polarized signal and System Parameter Design, in turn
The detectivity for improving radar accurately identifies all kinds of meteorological particles and detection forecasting weather.
Detailed description of the invention
The calibration unit schematic diagram of Fig. 1 WSR88D radar
Polarization controller schematic diagram Fig. 2 of the invention
The application block diagram of Fig. 3 digital radar calibration
Fig. 4 polarimetric radar transmitting of the present invention and the self-calibration schematic diagram for receiving system
Specific embodiment
Now in conjunction with embodiment, attached drawing, the invention will be further described:
1. polarizing control
The on-line proving technical requirements of dual polarization radar can produce various required polarization demarcation signals, i.e., to orthogonal
Two-way polarized signal carries out amplitude and phase and is continuously adjusted, and synthesizes any polarized wave.For this purpose, first introducing the pole that the present invention uses
Change wave control method.
As shown in Fig. 2, being divided into two-way, magic T through magic T (MT) by the transmitting signal that radar transmitter or signal generator generate
Upper arm concatenate a phase-shift controller θ, two paths of signals by 3dB electric bridge synthesis.It is concatenated on one arm of another 3dB electric bridge
Another phase-shift controllerWhen phase shifter phase theta andWhen continuously adjustable, it can be formed in output end H and V horizontal and vertical
Polarized signal forms elliptically polarised wave after orthocoupler OMT, and wherein H is expressed as horizontal direction polarization, and V is expressed as hanging down
Straight direction polarization.Adjust phase shifter θ andSize can control the ratio of elliptical inclination angle and major and minor axis, form any polarization shape
The polarized wave of state.
In order to export the polarized wave of various modes, the 90 ° of phase shifts controlled by a waveguide switch are concatenated again in the upper arm of magic T
Device.When waveguide switch selects 0 ° of phase shift, horizontal channel H polarized signal and vertical channel V polarization letter of the constant amplitude with phase can produce
Number, two paths of signals forms level or simultaneously the transmitting signal of vertical polarization simultaneously by orthomode coupler OMT.Work as waveguide switch
When selecting 90 ° of phase shifts, the power for emitting signal can be made to enter the channel H, to form the transmitting signal of horizontal polarization.Pass through in this way
The polarized wave of various modes can be completed in 90 ° of phase shifters of two phase shifters and control concatenation electronic switch that adjust polarization networks
Control.
2. the Digital Calibration method of radar
Digital Calibration unit is substantially the signal generator of a random waveform inside radar system, can be according to inspection
The signal for needing to generate various standard signals, random waveform and frequency spectrum for surveying radar system parameters, such as continuous wave sinusoidal signal, makes an uproar
Acoustical signal, Any Digit waveform signal etc. also can produce the delay and modulated signal of transmitting signal.Digital Calibration of the invention
Standard sine signal, noise signal that unit generates etc., constitute demarcation signal group with modulated digitally transmitted signals, pass through
Selection switch carries out output selection.
Digital Calibration unit is the Digital Realization of simulated calibration unit, can not only realize whole function of simulated calibration unit
Can, it can also realize the irrealizable function of simulated calibration unit, repertoire is digitally realized, is such as generated and is appointed
Meaning waveform signal, Gaussian spectrum signal and any polarized signal etc..As it was noted above, simulated calibration unit comes with some shortcomings,
The present invention uses Digital Calibration unit.Compared to simulated calibration unit, Digital Calibration unit has following features:
(1) the accurate attenuation step size controlling to signal is realized with amplitude control and fixed attenuator, substitute analog attenuator；
(2) various calibration signal is flexibly generated.For example, can produce sinusoidal continuous wave demarcation signal, and additional how general
Strangle frequency displacement；It can produce pulse calibration signal, range delay control, phase shifting control are carried out to pulse signal and realize that phase is compiled
Code；The echo-signal that can produce Gaussian spectrum tests the spectrum width algorithm for estimating of signal processing；It can produce and arbitrarily prolong
Slow transmitting pulse copy simulates multiecho, and deblurring function of adjusting the distance is tested, while to exomonental copy
It is modulated in numeric field；
(3) signal-to-noise ratio of demarcation signal is controlled.
The composition of the Digital Calibration unit of radar and usage in radar are as shown in Figure 3.It is coupled out from transmitter
A small amount of transmitting signal (signal can any position coupling) between circulator and antenna, by down coversion, filtering, ADC,
I/Q baseband signal is formed after the processing such as complex modulation, inputs and is used as transmitted reference signal in demarcation signal processor.Demarcation signal
Middle white Gaussian noise, continuous wave signal, pulse calibration signal and radio-frequency delay signal are generated by digital circuit, various marks
Signal is determined after DAC is converted into analog signal, demarcation signal is converted to by radio frequency stage by upconverter, by T/R switch
It is injected into receiver front end.These demarcation signals demarcate the parameters of the Receiver And Transmitter of radar system.
3. polarimetric radar online calibration method
In order to realize the on-line proving of Changeable Polarization Radar System, the present invention devises a kind of side of polarimetric radar on-line proving
Method.It is demarcated by Digital Calibration unit, digital to analog converter (DAC), frequency converter, any polarization controller, dual polarised radiation
Loudspeaker, main Feed Horn, two receiving channels and signal processor composition.It is characteristic of the invention that being replaced with Digital Calibration unit
Simulated calibration unit injects demarcation signal in such a way that loudspeaker radiation is demarcated in dual polarization, passes through instead of from receiver front end
Directional coupler injects demarcation signal.
The specific embodiment of the invention is as follows: increasing demarcation signal channel in dual polarization radar, demarcation signal channel is by double
Loudspeaker, waveguide, orthomode coupler OMT, polarization controller, evil spirit T, frequency converter, filter, Digital Calibration list are demarcated in polarized radiation
The composition such as member.By taking the DUAL POLARIZATION WEATHER RADAR of X-band as an example, antenna system uses circle corrugated horn as feed, uses standard
Circle paraboloid is as reflecting surface.In radar reflection face center opening, waveguide and calibration loudspeaker are installed, calibration loudspeaker are followed by OMT.Mark
Determine loudspeaker and Feed Horn concentrically axis, and demarcate bell mouth diameter and be slightly less than Feed Horn, blocks shadow with non-calibrating loudspeaker
Ring the gain of antenna reflective face.In order to realize on-line proving, a waveguide switch is designed in radar emission output end.Radar is in
When normal mode of operation, waveguide switch connection position " 2 ".Emit signal and polarization controller is entered by evil spirit T, required for formation
Horizontal H and V polarized wave, then through collector ring, waveguide and orthomode coupler OMT, through Feed Horn and antenna-reflected towards space
It radiate.Calibration loudspeaker are in close state at this time.Polarimetric radar on-line proving principle is as shown in Figure 4.
When dual polarization radar work is in calibration mode, waveguide switch is directed toward position set, and transmitting signal will be in calibration channel
Complete the processing such as control, amendment and calibration of signal.
When dual polarization radar is in staking-out work mode, work step is as follows:
1) in transmitter output end, a small amount of pair identical with transmitting signal spectrum and phase property is coupled out by coupler
This signal；
2) intermediate-freuqncy signal is obtained after being mixed copy signal with local oscillation signal, intermediate-freuqncy signal carries out digital sample through ADC and turns
Turn to digital signal；
3) digital signal is baseband signal after DDC Digital Down Convert, and baseband signal is formed after complex demodulation is handled
Emit signal copy i/q signal, spectrum analysis, phase analysis and the power analysis of transmitting signal are realized on i/q signal；
4) in Digital Calibration signal processing, various calibration signal, including postpones signal, mark are digitally generated
Quasi-sine-wave signal, white noise signal, spectrum signal, Any Digit waveform signal.Demarcation signal is handled by digital form, such as
Transmitting copy signal is modulated and is postponed, to generate the echo-signal in different distance.Copy signal is real using memory
The digital delay control of existing random length, the duration of delay depend on memory capacity；Emit copy signal and carry out amplitude control,
Dynamic range, the improvement factor parameter of instrumentation radar system；Digital phase shift is carried out to transmitting signal copy, to generate Doppler's frequency
It moves, the Doppler frequency shift that Simulated movable target generates, to detect the performance that tests the speed of radar；White noise is generated with pseudo noise,
Its excess noise ratio is adjusted by digital amplitude control, and according to the requirement of signal-to-noise ratio, superposition is made an uproar in proportion on transmitting signal copy
Sound, with measuring receiver noise coefficient and gain；Use the dynamic range and linear journey of standard sine wave signal measurement receiver
Degree；In the random waveform signal for generating emulation, Gaussian frequency spectrum letter is generated according to specified frequency, signal-to-noise ratio and spectrum width
Number, detectability and calibration are carried out to weather radar spectrum width algorithm；
5) treated demarcation signal, becomes analog signal through processing such as orthogonal transformation, adder and DAC.Using upper
Frequency conversion, the laggard infatuated T of filtering are divided into two paths of signals, and the microwave for inputting the compositions such as phase shifter, electric bridge, electronic switch respectively, which polarizes, to be controlled
Device processed, the amplitude and phase of adjustment signal generate required two-way H, V polarization demarcation signal；
6) H, V demarcation signal that polarizes synthesize the calibration polarized wave of any polarization characteristic all the way by OMT, into being mounted on day
Calibration loudspeaker at the top of line, to main feed source radiation；
7) main feed source electromagnetic horn receives demarcation signal, after waveguide, OMT, circulator, is entered radar H and V and receives and lead to
Road.Two-way receives signal and is input into radar signal processor, and shows in terminal, to detect radar transmitter and receiver
Performance parameter completes entire polarized signal on-line proving process.
Under the operating mode of calibration, by above-mentioned process, polarized signal is mutually adjusted from transmitting, calibration processing, polarization wave amplitude
Radar system parameters and performance are carried out online engineering calibrating by the closed loop test system of whole, calibration loudspeaker, receiver.
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.
Claims (1)
1. a kind of any polarized wave online calibration method of dual polarization radar, it is characterised in that steps are as follows:
Step 1: radar works under calibration mode, by coupler transmitter output end be coupled out with emit signal spectrum and
The identical copy signal of phase property；
Step 2: intermediate-freuqncy signal is obtained after copy signal is mixed with local oscillation signal, intermediate-freuqncy signal carries out digital sample through ADC and turns
Turn to digital signal；
Step 3: digital signal is baseband signal after DDC Digital Down Convert, and baseband signal is formed after complex demodulation is handled
Emit signal copy i/q signal；
Step 4: transmitting signal copy i/q signal being input in Digital Calibration signal processor, to transmitting signal copy I/Q letter
It number is modulated and postpones；The various calibration signal that postpones signal and Digital Calibration signal processor itself are generated is according to be checked
It surveys performance parameter and carries out selection output；The wherein various calibration signal, including standard sine wave signal, white noise signal,
Spectrum signal and Any Digit waveform signal；
Step 5: the output signal of Digital Calibration signal processor becomes analog signal through orthogonal transformation, adder and DAC, then
It is divided into two paths of signals by the laggard infatuated T of up-conversion, inputs the amplitude and phase of microwave polarization controller adjustment signal respectively, produces
Raw required two-way H, V polarization demarcation signal；The microwave polarization controller includes phase shifter, electric bridge and electronic switch；
Step 6:H, the V demarcation signal that polarizes synthesizes the calibration polarized wave of any polarization characteristic all the way by OMT, into being mounted on day
Calibration loudspeaker at the top of line, to main feed source loudspeaker radiation；
Step 7: the main received demarcation signal of Feed Horn enters two-way radar receiver through OMT, waveguide and circulator again, finally
It is input into radar signal processor, and is shown on terminal organ, it is complete to detect the performance parameter of radar transmitter and receiver
At entire polarized signal on-line proving process；
The related method thereof used in step 4: realizing that the digital delay of random length is controlled using memory length is changed, delay
Duration depends on memory capacity.
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| CN107219509B (en) * | 2017-05-22 | 2020-02-07 | 西安电子工程研究所 | Method for realizing online detection of radar system transmitting channel |
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