CN104316913B - Multichannel receiver real time calibration device and calibration and error compensating method - Google Patents
Multichannel receiver real time calibration device and calibration and error compensating method Download PDFInfo
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- CN104316913B CN104316913B CN201410639853.XA CN201410639853A CN104316913B CN 104316913 B CN104316913 B CN 104316913B CN 201410639853 A CN201410639853 A CN 201410639853A CN 104316913 B CN104316913 B CN 104316913B
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- G—PHYSICS
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- 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
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Abstract
The invention discloses a kind of multichannel receiver real time calibration device, including synchronous error calibrating installation, for carrying out real-time synchronization calibration and error compensation to the multichannel receiver；And amplitude phase error calibrating installation, for carrying out real-time calibration of amplitude and phase and error compensation to the multichannel receiver.A kind of and multichannel receiver real-time calibration method.Apparatus and method of the present invention is to calibrating for error comprehensively, Integrated Architecture can be realized simultaneously carries out real-time synchronization calibration and calibration of amplitude and phase to multichannel receiver, with very strong real-time and flexibility, automaticity is high, its whole process that can be worked through system that calibrates for error, corresponding selection only need to be made in system control interface, changed without any line and hardware, the calibration process of system can be completed, it is simple to operate, using quick, environmental condition can accurately be compensated, the influence that device property is brought to receiving channel, effectively solves difficult of the reception of big bandwidth signal.
Description
Technical field
The invention belongs to Radar Technology field, more particularly, to a kind of multichannel receiver real time calibration device and school
Accurate and error compensating method.
Background technology
Due to synthetic aperture radar (SAR) can round-the-clock, it is round-the-clock be imaged over the ground, and with necessarily penetrating vegetation and camouflage
Ability, therefore be widely used in the fields such as military surveillance, disaster monitoring, resources survey, mapping, it is each by the world
State more and more payes attention to.With the continuous development of Synthetic Aperture Radar Technique and the continuous expansion of application field, to radar
Can requirement also one of more and more higher, core technology index of its intermediate-resolution as synthetic aperture radar, be more thus lifted to more
High position.
The raising of range resolution depends on the raising of signal bandwidth, to realize high-resolution imaging, it is necessary to solves big
The Receiver Problem of bandwidth signal, and bandwidth is up to signal more than gigahertz that there is presently no the high-speed a/d that can be directly sampled
Switching device.Directly this problem can not be changed in order to solve ultra wide band (UWB) radar signal by A/D, for LFM signals,
M.Skolnik etc. proposes the radar pulse compression scheme based on time-frequency conversion technology (Stretch Processing).The party
Case is highly effective to the LFM signals under certain condition, but also has following problem：(1) distortion compensation is difficult：During due to introducing
Frequency changes this link, brings time-frequency convert distortion accordingly, when target is mobile or frequency modulation local oscillator triggering moment becomes
During change, the influence of this distortion changes therewith, shows to move the property become, this just brings great difficulty to system balance；
(2) it is limited to survey and draw bandwidth：In order to reduce signal bandwidth, tiltedly processing is gone to be to sacrifice mapping with a width of cost, that is to say, that such as
Fruit requires mapping broader bandwidth, can not reach the purpose for reducing signal bandwidth after going tiltedly processing.Especially latter issue, sternly
The use range of the program is limited again.
Under the conditions of prior art, to improve the range resolution ratio of SAR system, multichannel synthesis is currently employed main skill
One of art means.The program is based on Digital Channelized Receiving technology, radar echo signal is divided into using Dividing in frequency domain method multiple
Subband is received, is sampled on each subband with the A/D of relative low speeds, finally frequency band synthesis is carried out in numeric field, obtains full band
Bandwidth signals.
Why this method turns into the mainstream technology of the Wideband Signal Processing, is because it can effectively reduce high-speed a/d
The technical requirements of device, single channel A/D designs and follow-up data record, the pressure of imaging is greatly reduced so that current big band
The lower wide swath of width is possibly realized.But this method needs emphasis to solve two problems, first, multi-channel A/D's synchronously asks
Topic, another question is the width phase distortion problem of multichannel.
Multi-channel A/D stationary problem first, that is, the interchannel delay of data acquisition unit, when same signal is the same as addition
After being downloaded to different acquisition passage, whether multigroup collection first point of time difference reflected in signal waveform of Number Sequence is zero.It
It is a very important basic index, is requiring sequential, phase etc. particularly severe SAR waveform acquisitions and recording process
In, the Delay Between Channels of data collecting system are the indexs that must accurately know, the follow-up amplitude phase error of radar
Compensation and imaging are established on the basis of each passage Complete Synchronization.
Another question is interchannel width phase distortion problem.Due to the unstability and inconsistency of analog device, he
Width phase difference not only changed with frequency, also often do slow change with the time.The direct multichannel synthesis of subband signal is not
But range resolution ratio can not be improved, can also make image quality severe exacerbation.SAR receiving channel error contain range error,
Phase error two parts, expression areH in formulan(w) it is the total amplitude phase error of the n-th passage
Function, An(w) range error is represented,Phase error is represented, w represents frequency.Above-mentioned error can produce to imaging results
Adverse effect, causes main lobe broadening, secondary lobe lifting, resolution ratio and image degradation of the distance to pulse compression shock response.
The estimation and compensation of inter-channel synchronization error and amplitude phase error, turn into the design of multichannel SAR system and signal transacting
Key technology.
The calibrating installation of synchronous error still without integration and amplitude phase error in the prior art, is missed both for single item
The compensation that difference is made.For the synchronous error of interchannel, prior art is often solved in numeric field, or to sampling clock
Handled with trigger signal, with reference to phase-locked loop and by means such as optimization circuits, realize multi-channel A/D synchronization；Pin
To the amplitude phase error of interchannel, typically now way is to use radar closed loop test means, disposably obtains experimental data；Or
Person, using standard measuring instruments such as vector network analyzer, the amplitude phase error of interchannel is measured；Again or, based on return
Wave number is according to directly progress error extraction.
For the synchronous error of interchannel, prior art is applicable in the case of A/D device sample rates are relatively low, once relate to
And high-speed a/d, receiving channel Sampling Rate is in more than 1.5GHz such as in SAR system, and now circuit is to clock signal jitter
Very sensitive, the error of ps levels may bring the asynchronous of interchannel during upper electric or reset every time, in this case above-mentioned side
Method it is difficult to ensure that between multiple acquisition channels of multi-group data delay-time difference be essentially 0 or keep steady state, be also just difficult to from
Fundamentally solves stationary problem.
For the amplitude phase error of interchannel, the common issue of the three kinds of methods used now is real-time deficiency, is all pin
The processing made to data record after the completion of, record and contained many uncertain width in the data of completion and mutually miss
Difference, residual error composition is still very big after overcompensation, it is impossible to makes standard for the time variation and temperature drift of analog channel performance
True compensation, influence the extraction and utilization of Large Copacity information in big bandwidth signal.
The content of the invention
For above-mentioned technical problem, an object of the present invention is to provide a kind of multichannel receiver real time calibration device
With calibration and error compensating method, with realize single treatment can complete two errors analysis and compensation.
To achieve the above object, as one aspect of the present invention, the invention provides a kind of multichannel receiver width phase
Calibrate for error device, including：
Amplitude phase error calibration network, the amplitude phase error for producing the corresponding each passage of multichannel receiver calibrate letter
Number；And
Amplitude phase error compensating unit, for based on amplitude phase error calibration signal pair caused by the amplitude phase error calibration network
The each passage of multichannel receiver carries out calibration of amplitude and phase and error compensation.
Wherein, the amplitude phase error calibration network includes：
One calibration of amplitude and phase signal source, for exporting the standard signal of calibration；
One signal conditioning circuit, the amplitude size of the standard signal for adjusting the calibration, to adapt to different echoes
Calibration of amplitude and phase between signal to noise ratio state lower channel；And
One calibration of amplitude and phase switchs, and for model selection, switches between calibration of amplitude and phase pattern and normal mode.
Wherein, the amplitude phase error compensating unit is to the method for each passage progress calibration of amplitude and phase and error compensation：Will
The data signal frequency-domain transform gathered is S (w), and calculates the frequency domain I (w) of ideal linearity FM signal, is thus obtained described
The transmission error of passageThe error H obtained using analysisn(w) connect to described
Receive passage and carry out calibration of amplitude and phase and error compensation processing.
As another aspect of the present invention, present invention also offers a kind of multichannel receiver real time calibration device, bag
Include：
Synchronous error calibrating installation, for carrying out real-time synchronization calibration and error compensation to the multichannel receiver；With
And
As above the amplitude phase error calibrating installation described in any one, for carrying out real-time width phase to the multichannel receiver
Calibration and error compensation.
Wherein, the synchronous error calibrating installation includes：
Synchronous error calibration network, the synchronous error calibration of each passage for producing the corresponding multichannel receiver
Signal, including：
One synchronous calibration signal source, for exporting synchronous error calibration signal, wherein the synchronous error calibration signal is
Point-frequency signal with certain amplitude；
One power division network, for the synchronous error calibration signal to be divided into multiple signals corresponding with port number；And
One switch matrix, for model selection, between the synchronous error calibration signal and normal mode of operation signal
Complete switching；And
Synchronous error compensating unit, mended for synchronizing calibration and error to each passage of the multichannel receiver
Repay, wherein calibration is synchronized to each passage for the synchronous error compensating unit and the method for error compensation is：Evaluate every
One first, passage gathered data initial phase corresponding in sine wave is fittedBetween different acquisition passage initial phase value
Corresponding phase differenceThe time difference Δ t of reflection, it is the interchannel delay time for the data collecting system to be obtained
Difference, compensate the synchronous calibration and error compensation that each passage is completed after the time difference.
Wherein, the amplitude phase error calibrating installation includes amplitude phase error calibration network and amplitude phase error compensating unit, described
Synchronous error calibrating installation includes synchronous error calibration network and synchronous error compensating unit；And
The amplitude phase error calibration network is described synchronously to miss between prime low-noise amplifier and N roads power division network
Poor calibration network is located at before multi-channel A/D unit inputs, and the synchronous error compensating unit is set afterwards close to multi-channel A/D units
Put, the amplitude phase error compensating unit is arranged on after the synchronous error compensating unit.
As another aspect of the invention, present invention also offers a kind of multichannel receiver real time calibration and error to mend
Compensation method, comprise the following steps：
Controlling switch matrix, the mode of operation of the multichannel receiver is switched to required mode of operation；And
When switching to synchronous calibration pattern, synchronous calibration signal source outputting standard point-frequency signal, by power division network point
Into multiple signals corresponding with port number, exported via switch matrix and give multichannel A/D units；Multichannel A/D units are to each logical
After road signal is digitized processing, it is sinusoidal in fitting that synchronous error compensating unit evaluates each first gathered data of passage
Corresponding initial phase in rippleCorresponding phase difference between different acquisition passage initial phase valueThe time difference of reflection
Δ t, it is the Delay Between Channels for the data collecting system to be obtained；Compensate complete after the time difference it is described each logical
The synchronous calibration and error compensation in road；
When switching to calibration of amplitude and phase pattern, the output of calibration of amplitude and phase signal source is calibrated by the amplitude phase error of pre-distortion compensated
Signal gives Digital Channelized Receiving unit；
The Digital Channelized Receiving unit each Ro-vibrational population calibration signal is carried out successively channelizing selection, down coversion,
A/D units are output to after the simulation process such as MGC amplifications；The amplitude phase error calibration signal is digitized by the A/D units
Processing, then amplitude phase error compensating unit is output to after digital demodulation is changed into digital baseband signal, the amplitude phase error compensation is single
The data signal frequency-domain transform gathered is S (w) by member, and calculates the frequency domain I (w) of preferable amplitude phase error calibration signal, by
This obtains the transmission error of the passageUtilize Hn(w) described receive is led to
Road carries out calibration of amplitude and phase and error compensation processing, eliminates phase, range error in the passage.
Wherein, can be needed to switch to synchronization and/or calibration of amplitude and phase pattern according to system at any time in system work process
Calibrated.
Wherein, be first switched to synchronous calibration pattern, after the completion of be switched to calibration of amplitude and phase pattern again.
As the still another aspect of the present invention, present invention also offers a kind of real time calibration of multichannel receiver and error
Compensation method, comprise the following steps：
Switch to synchronous calibration pattern；
Synchronous calibration signal source outputting standard point-frequency signal, is exported mono- to multichannel A/D by power division network, switch matrix
Member；
After digitized processing, synchronous error compensating unit evaluates each first gathered data of passage in fitting sine wave
In corresponding initial phaseCorresponding phase difference between different acquisition passage initial phase valueThe time difference Δ of reflection
T, be the Delay Between Channels for the data collecting system to be obtained, compensate complete after the time difference synchronous calibration and
Error compensation；
System is transferred to calibration of amplitude and phase pattern, simultaneously closes off synchronous calibration pattern；
Calibration of amplitude and phase signal source output by pre-distortion compensated ideal linearity FM signal, by signal condition unit,
Calibration of amplitude and phase mode selection circuit, which exports, gives Digital Channelized Receiving unit；
The signal in Digital Channelized Receiving unit successively by channelizing selection, down coversion, MGC amplifications etc. after simulation process,
Digitized process is completed in A/D units；
After digital demodulation is changed into digital baseband signal, the baseband signal is entered in Ro-vibrational population compensating unit
Line frequency analysis is to obtain the transmission characteristic of the passage and for error ideally, the data signal that will be gathered
Frequency-domain transform is S (w), and calculates the frequency domain I (w) of ideal linearity FM signal, is so obtained with the actual letter collected
Difference number with ideal linearity FM signal, that is, the transmission error of the passage
The error H obtained using analysisn(w) calibration of amplitude and phase is carried out to receiving channel and error compensation is handled；
Whole calibration process is completed, and system enters normal mode of operation.
According to the above-mentioned technical solution, the present invention calibrate for error comprehensively, by multichannel receiver integrated synchronous,
Calibration of amplitude and phase device, Integrated Architecture can be realized simultaneously carries out real-time synchronization calibration and calibration of amplitude and phase to multichannel receiver,
The control information of the multiple interchannels of automatic measurement, eliminate influence of two kinds of uncertainties to passage, it is important that the invention has
Very strong real-time and flexibility, automaticity are high, its whole process that can be worked through system that calibrates for error, only need to be
Corresponding selection is made in radar control interface, is changed without any line and hardware, you can completes the calibration process of system, operates
Simply, using quick, it can accurately compensate environmental condition, the influence that device property is brought to receiving channel, be multi-channel data
Processing lay a good foundation, can effectively solve the reception problem of big bandwidth signal.
Brief description of the drawings
Fig. 1 is the structural representation of traditional multichannel receiver；
Fig. 2 is the structural representation of the multichannel receiver for being integrated with real time calibration device of the present invention；
Fig. 3 is the principle schematic of the multichannel receiver for being integrated with real time calibration device of the present invention；
Fig. 4 (a) is the composition structural representation of the synchronous calibration device of the present invention；
Fig. 4 (b) is the schematic diagram of the synchronous error analysis and compensation method of the present invention；
Fig. 5 (a) is the composition structural representation of the calibration of amplitude and phase device of the present invention；
Fig. 5 (b) is the schematic diagram of amplitude phase error error analysis and the compensation method of the present invention；
Fig. 6 is the multichannel receiver Integral synchronous of the present invention, the flow chart of calibration of amplitude and phase method；
Fig. 7 is the flow chart of the method for the multichannel receiver synchronous calibration of the present invention (so that A/D resets as an example)；
Fig. 8 is that the calibrating installation of the present invention is applied to the pulse pressure result spectrum after real system, wherein including school
The contrast of signal, calibration front signal and standard signal after standard.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in further detail.
Under the conditions of prior art, to improve system, such as the range resolution ratio of synthetic aperture radar, multichannel synthesis is to work as
One of technical way of preceding use.But this method needs emphasis to solve two problems, first, multi-channel A/D's synchronously asks
Topic, another question is the width phase distortion problem of multichannel.
For two main error compositions of multichannel reception signal --- synchronous error and amplitude phase error, the present invention, which uses, to be divided
Calibration is decomposed into two effective steps by footwork, respectively the synchronous error calibration and amplitude phase error calibration between respective channel, and one
Secondary processing can complete the analysis and compensation of two errors；Importantly, the present invention has very strong real-time, on every subsystem
It can select to switch to the calibration mode whole calibrations of progress or the calibration of a certain item, automatic compensation after electricity or in system work process
The influence that environmental condition, device property are brought to receiving channel, it is especially suitable for the reception of big bandwidth multi channel signals.
The first aspect of the invention is the integrated real time calibration device of multichannel receiver, is calibrated comprising synchronous error
Network and synchronous error compensating unit, amplitude phase error calibration network and amplitude phase error compensating unit, the former is referred to as synchronous error
Calibrating installation, the latter are referred to as amplitude phase error calibrating installation.
The technical scheme that the multichannel receiver integration real time calibration device of the present invention uses is in multichannel receiver
Synchronization, calibration of amplitude and phase network and its error compensation unit are internally integrated, Integrated Architecture can be realized simultaneously to be received to multichannel
Machine carries out real-time synchronization calibration and calibration of amplitude and phase, accurately measures the control information of multiple interchannels.Using substep in specific implementation
Method carries out being calibrated and compensated for for multichannel, synchronizes calibrate for error first, synchronism is the basis of whole signal transacting, subsequently
The synchronization that calibration of amplitude and phase and all data processings are all relied between multi-channel A/D.Signal source exports a bit in synchronous calibration network
Frequency signal, A/D units carry out data acquisition, handled in synchronous error compensating unit, are changed by extracting phase information
For the time difference information of interchannel, so as to complete the calibration of synchronism；Second step, carry out amplitude phase error calibration, radar receiver
(behind front end) receives the output signal of calibration signal source, and data acquisition unit is entered after the processing by follow-up analog channel, number
Handled after word in amplitude phase error compensating unit, amplitude and phase information are extracted by comparing, it can be deduced that be each logical
Amplitude phase error between road, so as to complete calibration of amplitude and phase.
The present invention synchronous error calibrating installation include a synchronous calibration signal source, a power division network, a switch matrix and
Synchronous error compensating unit in passage.The point-frequency signal of the source of synchronising signal output with certain amplitude, by work(subnetting
N roads appropriate signals are formed after network, wherein N is the number of passage.The switch matrix is to model selection, in synchronizing signal and just
Normal mode of operation signal, such as switching is completed after down coversion between IF signals, due between synchronous calibration simply compensation A/D units
Synchronism error, it is unrelated with other devices, so the synchronizing network is placed close to A/D units, so can also be greatly reduced other
The uncertainty that part is brought to detection calibration.
For the calibration signal after A/D unit digitized processings, the synchronous error compensating unit evaluates each passage
One gathered data initial phase corresponding in sine wave is fittedCorresponding between different acquisition passage initial phase value
Phase differenceThe time difference Δ t of reflection, it is the Delay Between Channels for the data collecting system to be obtained, compensation should
Synchronous calibration is completed after time difference.
The amplitude phase error calibrating installation of the present invention includes a calibration of amplitude and phase signal source, a signal conditioning circuit, a width mutually school
Amplitude phase error compensating unit in quasi- switch and passage.The calibration of amplitude and phase signal source to export the standard signal of calibration,
The signal is regarded as preferable linear FM signal by pre-distortion compensated, and the signal conditioning circuit is mainly adjusting letter
Number amplitude size, to meet the calibration of amplitude and phase between different echo signal to noise ratio state lower channels, the calibration of amplitude and phase switch is to mould
Formula selects, and switches between calibration mode and normal mode.It should be noted that calibration of amplitude and phase network settings receive in multichannel
The centre position of machine common port, i.e., between prime low-noise amplifier and N roads power division network, have of both benefit, one
It is that can effectively avoid the error that receiver front end is brought to big bandwidth signal, second, it can also be ensured that calibration network is to receiving
The contribution of channel noise coefficient reaches negligible degree.Because receiver front end belongs to the common port of multichannel reception, this
It is highly beneficial and necessary for calibration of amplitude and phase that kind, which is set,.
Enter data acquisition unit after processing of the calibration of amplitude and phase signal by follow-up analog channel, be changed into by digital demodulation
After digital baseband signal, the amplitude phase error compensating unit carries out frequency analysis to obtain the transmission of the passage to the baseband signal
Characteristic and for error ideally, the data signal frequency-domain transform that will be gathered is S (w), and calculates ideal line
Property FM signal frequency domain I (w), be so obtained with the difference of actual signal and the ideal linearity FM signal of collection,
It is exactly the transmission error of the passageThe error H obtained using analysisn(w) it is right
Receiving channel carries out calibration of amplitude and phase and error compensation processing, it is possible to eliminates phase in signalling channel, range error.
The integrated real time calibration device composition of the present invention is as shown in table 1.
The integrated real time calibration device composition of table 1
The second aspect of the invention there is provided a kind of real time calibration and error compensation of multichannel receiver integration
Method, it is main using two main errors --- synchronous error and the amplitude phase error of the multiple receiving channels of method of fractional steps disposable compensation
Want step as follows：
Synchronous calibration pattern is switched to after system electrification is in stable condition；
Synchronous calibration signal source outputting standard point-frequency signal, is exported mono- to multichannel A/D by power division network, switch matrix
Member；
After digitized processing, synchronous error compensating unit evaluates each first gathered data of passage in fitting sine wave
In corresponding initial phaseCorresponding phase difference between different acquisition passage initial phase valueThe time difference Δ of reflection
T, it is the Delay Between Channels for the data collecting system to be obtained.Compensate complete after the time difference synchronous calibration and
Error compensation.
System is transferred to calibration of amplitude and phase pattern, simultaneously closes off synchronous calibration pattern.
Calibration of amplitude and phase signal source output by pre-distortion compensated ideal linearity FM signal, by signal condition unit,
Calibration of amplitude and phase mode selection circuit, which exports, gives Digital Channelized Receiving unit；
The signal in Digital Channelized Receiving unit successively by channelizing selection, down coversion, MGC amplifications etc. after simulation process,
Digitized process is completed in A/D units, now A/D units have been completed synchronous calibration and error compensation, the signal containing only
There is amplitude phase error；
After digital demodulation is changed into digital baseband signal, the baseband signal is entered in Ro-vibrational population compensating unit
Line frequency analysis is to obtain the transmission characteristic of the passage and for error ideally, the data signal that will be gathered
Frequency-domain transform is S (w), and calculates the frequency domain I (w) of ideal linearity FM signal, is so obtained with the actual letter collected
Difference number with ideal linearity FM signal, that is, the transmission error of the passage
The error H obtained using analysisn(w) calibration of amplitude and phase is carried out to receiving channel and error compensation is handled, it is possible to disappeared
Except phase, range error in signalling channel, the high-resolution imaging to synthetic aperture radar is realized.
Whole calibration process is completed, and system enters normal mode of operation.
It should be noted that being calibrated in system work process if necessary to not timing, calibrating die can be switched at any time
Formula is calibrated；Also partial collimation can be carried out, as needed to reset A/D units in system work process, then only needs to repeat
Environment temperature has and such as analog channel need to be carried out during certain change after synchronous calibration in said process, or system work
Calibration, then need to only repeat calibration of amplitude and phase process.
Below by the specific embodiment of the concrete application in synthetic aperture radar, the invention will be further elaborated.
Fig. 3 be for ultrahigh resolution synthetic aperture radar reception system used by, the present invention synthetic aperture radar
Calibrating installation during high-precision real, the device contain real-time synchronization calibrating installation, calibration of amplitude and phase device.The radio frequency of receiver input
Centre frequency 14.8GHz, bandwidth 3.2GHz, 8 subbands are divided into, 8 intermediate frequencies, IF-FRE scope are formd after downconverted
It is 1GHz ± 0.2GHz.
Synchronize and calibrate for error first after system electrification, real-time synchronization calibrating installation include synchronous error calibration network and
Two parts of synchronous error compensating unit, shown in real-time synchronization calibrating installation such as Fig. 4 (a), a synchronous calibration signal source, for defeated
Go out a standard sine signal；One power division network, for the standard signal to be divided into 8 road signals；One switch matrix, for marking
Switched between quasi- passage and normal work passage；Synchronous error compensating unit, for believing the synchronous calibration after digitlization
Number carry out Treatment Analysis and channel error compensation.Because synchronous calibration is to compensate the synchronism error between A/D units, with other
Device is unrelated, so the synchronous error calibration network is placed close to A/D units, other parts so can also be greatly reduced to test
The uncertainty that calibration tape comes.The synchronous error analysis of interchannel and compensation schematic diagram such as Fig. 4 (b) are shown.
Synchronous error calibration mode is opened in system, and calibration of amplitude and phase pattern is closed, some frequency of now source of synchronising signal output
Signal, the signal can be provided by the steady frequency synthesizer of height of radar system, and it is mutually complete that 8 road width are formed after the decile of power division network 8
Consistent standard signal, 8 road A/D converting units are entered after switch matrix, complete Channel Synchronous error compensation after digitlization
Unit evaluation goes out each first gathered data of passage initial phase corresponding in sine wave is fittedDifferent acquisition passage
Corresponding phase difference between initial phase valueThe time difference Δ t of reflection, it is the passage for the data collecting system to be obtained
Between delay-time difference, system completes synchronous calibration and error compensation task after compensating the time difference.
Then progress calibration of amplitude and phase and error compensation, real-time calibration of amplitude and phase device such as Fig. 5 (a), a calibration of amplitude and phase signal source,
For exporting a calibration of amplitude and phase signal, the signal passes through pre-distortion compensated, it is believed that is a preferable linear FM signal；One letter
Number modulate circuit, for adjusting the output amplitude of calibration signal source；One calibration of amplitude and phase switchs, in calibrated channel and normal work
Make to switch between passage；Amplitude phase error compensating unit, for carrying out Treatment Analysis to the calibration signal after digitlization and leading to
Road error compensation.Calibration of amplitude and phase network is placed in the centre position of receiver, i.e., in front of the receiver behind end, has both sides good
Place, first, the error that receiver front end is brought to big bandwidth signal can be effectively avoided, second, it can also be ensured that calibration network pair
The contribution of receiving channel noise coefficient reaches negligible degree.Because receiver front end belongs to the public of multichannel reception
End, this set is highly beneficial and necessary for calibration of amplitude and phase.The amplitude phase error analysis of interchannel is with compensating schematic diagram such as
Shown in Fig. 5 (b).
After calibration of amplitude and phase pattern is opened, calibration of amplitude and phase switch, which is placed in, receives calibration signal pattern, the broadband of calibration input
Signal is the ideal linearity FM signal by pre-distortion compensated, after Digital Channelized Receiving, have passed through one-level down coversion,
It is the modulated signal that carrier frequency reduces, then after digital demodulation is changed into digital baseband i/q signal, is mended in Ro-vibrational population
Repay and frequency analysis is carried out to the baseband signal in unit to obtain the transmission characteristic of the passage and for ideally
Error, the data signal frequency-domain transform that will be gathered is S (w), and calculates the frequency domain I (w) of ideal linearity FM signal, so
It is obtained with the actual signal of collection and the difference of ideal linearity FM signal, that is, the transmission error of the passageThe error H obtained using analysisn(w) calibration of amplitude and phase is carried out to receiving channel
With error compensation processing, it is possible to eliminate phase in signalling channel, range error, complete the calibration of amplitude and phase of more receiving channels, be
Further processing and high-resolution imaging establish good basis to multi-channel data.
By putting into practice checking on probation, the solution of the present invention calibrates for error comprehensively, same by being integrated in multichannel receiver
Step, calibration of amplitude and phase device, Integrated Architecture can be realized simultaneously synchronizes calibration and calibration of amplitude and phase to multichannel receiver, tool
There are very strong real-time and flexibility, automaticity is high, is changed without any line and hardware, you can complete the calibration of system
Process, it is simple to operate, using quick, it can accurately compensate environmental condition, the influence that device property is brought to receiving channel, effectively
Solves the reception problem of big bandwidth signal.
Particular embodiments described above, the purpose of the present invention, technical scheme and beneficial effect are carried out further in detail
Describe in detail bright, it should be understood that the foregoing is only the present invention specific embodiment, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., the protection of the present invention should be included in
Within the scope of.
Claims (9)
1. a kind of multichannel receiver real time calibration device, including：
Synchronous error calibrating installation, for carrying out real-time synchronization calibration and error compensation to the multichannel receiver；It is described same
Walking the device that calibrates for error includes：
Synchronous error calibration network, letter is calibrated for producing the synchronous error of each passage of the corresponding multichannel receiver
Number；
Synchronous error compensating unit, for synchronizing calibration and error compensation to each passage of the multichannel receiver；
Amplitude phase error calibrating installation, for carrying out real-time calibration of amplitude and phase and error compensation to the multichannel receiver；The width
The device that mutually calibrates for error includes：
Amplitude phase error calibration network, for producing the amplitude phase error calibration signal of the corresponding each passage of multichannel receiver；
Amplitude phase error compensating unit, for based on amplitude phase error calibration signal caused by the amplitude phase error calibration network to described
The each passage of multichannel receiver carries out calibration of amplitude and phase and error compensation；
Wherein, the amplitude phase error calibration network is described synchronously to miss between prime low-noise amplifier and N roads power division network
Poor calibration network is located at before multi-channel A/D unit inputs, and the synchronous error compensating unit is set afterwards close to multi-channel A/D units
Put, the amplitude phase error compensating unit is arranged on after the synchronous error compensating unit.
2. multichannel receiver real time calibration device according to claim 1, wherein the synchronous error calibration network bag
Include：
One synchronous calibration signal source, for exporting synchronous error calibration signal, wherein the synchronous error calibration signal be with
The point-frequency signal of certain amplitude；
One power division network, for the synchronous error calibration signal to be divided into multiple signals corresponding with port number；And
One switch matrix, for model selection, completed between the synchronous error calibration signal and normal mode of operation signal
Switching.
3. multichannel receiver real time calibration device according to claim 1, wherein the synchronous error compensating unit pair
Each passage synchronizes calibration and the method for error compensation is：It is sinusoidal in fitting to evaluate each first gathered data of passage
Corresponding initial phase in rippleCorresponding phase difference between different acquisition passage initial phase valueThe time difference of reflection
Δ t, be the Delay Between Channels for the data collecting system to be obtained, compensate complete after the time difference it is described each
The synchronous calibration and error compensation of passage.
4. multichannel receiver real time calibration device according to claim 1, wherein the amplitude phase error calibration network bag
Include：
One calibration of amplitude and phase signal source, for exporting the standard signal of calibration；
One signal conditioning circuit, the amplitude size of the standard signal for adjusting the calibration, to adapt to different echo noises
Than the calibration of amplitude and phase between state lower channel；And
One calibration of amplitude and phase switchs, and for model selection, switches between calibration of amplitude and phase pattern and normal mode.
5. multichannel receiver real time calibration device according to claim 1, wherein the amplitude phase error compensating unit is to each
Individual passage carries out calibration of amplitude and phase and the method for error compensation is：It is S (w) by the data signal frequency-domain transform gathered, and calculates reason
Think the frequency domain I (w) of linear FM signal, thus obtain the transmission error of the passage
The error H obtained using analysisn(w) calibration of amplitude and phase is carried out to the receiving channel and error compensation is handled；
Wherein, Hn(w) it is the total amplitude phase error function of the n-th passage, i.e. transmission error；An(w) range error is represented；Table
Show phase error；W represents frequency.
6. a kind of multichannel receiver real time calibration and error compensating method, comprise the following steps：
Controlling switch matrix, by comprising the multichannel receiver real time calibration device as described in claim 1 to 5 any one
The mode of operation of multichannel receiver is switched to required mode of operation；
When switching to synchronous calibration pattern, calibration of amplitude and phase pattern is closed, synchronous calibration signal source outputting standard point-frequency signal, warp
Cross power division network and be divided into multiple signals corresponding with port number, exported via switch matrix and give multichannel A/D units；Multichannel A/
After D units are digitized processing to each channel signal, synchronous error compensating unit evaluates each first collection number of passage
According to corresponding initial phase in sine wave is fittedCorresponding phase difference between different acquisition passage initial phase value
The time difference Δ t of reflection, it is the Delay Between Channels for the data collecting system to be obtained；Compensate after the time difference i.e.
Complete the synchronous calibration and error compensation of each passage；
When switching to calibration of amplitude and phase pattern, synchronous calibration pattern is closed, and pre-distortion compensated is passed through in the output of calibration of amplitude and phase signal source
Amplitude phase error calibration signal give Digital Channelized Receiving unit；The Digital Channelized Receiving unit is to each Ro-vibrational population calibration signal
A/D units are output to after carrying out channelizing selection, down coversion, MGC amplification simulation process successively；The A/D units are by the width
The signal that mutually calibrates for error is digitized processing, then amplitude phase error compensation is output to after digital demodulation is changed into digital baseband signal
Unit, the data signal frequency-domain transform gathered is S (w) by the amplitude phase error compensating unit, and is calculated preferable width and mutually missed
The frequency domain I (w) of poor calibration signal, it is derived from the transmission error of the passage
Utilize Hn(w) calibration of amplitude and phase is carried out to the receiving channel and error compensation is handled, eliminate phase in the passage, amplitude is missed
Difference；
Wherein, Hn(w) it is the total amplitude phase error function of the n-th passage, i.e. transmission error；An(w) range error is represented；Table
Show phase error；W represents frequency.
7. multichannel receiver real time calibration according to claim 6 and error compensating method, wherein worked in system
It can need to switch to synchronization according to system at any time in journey and/or calibration of amplitude and phase pattern is calibrated.
8. multichannel receiver real time calibration according to claim 6 and error compensating method, wherein being first switched to synchronization
Calibration mode, after the completion of be switched to calibration of amplitude and phase pattern again.
9. the real time calibration and error compensating method of a kind of multichannel receiver, the multichannel receiver includes such as claim
Multichannel receiver real time calibration device described in 1 to 5 any one, the real time calibration include as follows with error compensating method
Step：
Switch matrix is switched into synchronous calibration pattern；
Synchronous calibration signal source outputting standard point-frequency signal, exports by power division network, switch matrix and gives multichannel A/D units；
After digitized processing, synchronous error compensating unit evaluates each first gathered data of passage institute in sine wave is fitted
Corresponding initial phaseCorresponding phase difference between different acquisition passage initial phase valueThe time difference Δ t of reflection, i.e.,
It is the Delay Between Channels for the data collecting system to be obtained, synchronous calibration and error is completed after compensating the time difference
Compensation；
System is transferred to calibration of amplitude and phase pattern, simultaneously closes off synchronous calibration pattern；
The ideal linearity FM signal of pre-distortion compensated is passed through in the output of calibration of amplitude and phase signal source, by signal condition unit, width phase
Calibration mode selection circuit, which exports, gives Digital Channelized Receiving unit；
The signal Digital Channelized Receiving unit successively by channelizing selection, down coversion, MGC amplification simulation process after, it is mono- in A/D
Digitized process is completed in first；
After digital demodulation is changed into digital baseband signal, line frequency is entered to the baseband signal in Ro-vibrational population compensating unit
Rate analysis is to obtain the transmission characteristic of the passage and for error ideally, the data signal frequency domain that will be gathered
Be transformed to S (w), and calculate the frequency domain I (w) of ideal linearity FM signal, be so obtained with the actual signal that collects with
The difference of ideal linearity FM signal, that is, the transmission error of the passage
Wherein, Hn(w) it is the total amplitude phase error function of the n-th passage, i.e. transmission error；An(w) range error is represented；Represent phase
Position error；W represents frequency；
The transmission error H obtained using analysisn(w) calibration of amplitude and phase is carried out to receiving channel and error compensation is handled；
Whole calibration process is completed, and system enters normal mode of operation.
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