CN109507651A - A kind of MIMO imaging system calibration method and device - Google Patents
A kind of MIMO imaging system calibration method and device Download PDFInfo
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- CN109507651A CN109507651A CN201811303358.6A CN201811303358A CN109507651A CN 109507651 A CN109507651 A CN 109507651A CN 201811303358 A CN201811303358 A CN 201811303358A CN 109507651 A CN109507651 A CN 109507651A
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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
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4008—Means for monitoring or calibrating of parts of a radar system of transmitters
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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
- G01S13/887—Radar or analogous systems specially adapted for specific applications for detection of concealed objects, e.g. contraband or weapons
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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
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
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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
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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- Radar, Positioning & Navigation (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The embodiment of the invention discloses a kind of MIMO imaging system calibration method and devices, wherein, the described method includes: the transmitting antenna and receiving antenna to the first face of mimo antenna array are calibrated, and determine the inconsistency parameter of transmission channel, the inconsistency parameter of the receiving channel in the first face and the first optimal delay phase compensation term in the first face；The transmitting antenna and receiving antenna in the second face of mimo antenna array are calibrated, and determine the inconsistency parameter of transmission channel, the inconsistency parameter of the receiving channel in the second face and the second optimal delay phase compensation term in the second face；According to each inconsistency parameter, the first optimal delay phase compensation term and the second optimum angle compensation of delay item, MIMO imaging system echo data collected is calibrated.This method, which no longer needs to prepare high-precision calibration component, calibrates MIMO imaging system, can reduce the complexity and difficulty of system calibration, it is more convenient convenient to make to calibrate.
Description
Technical field
The present embodiments relate to millimeter wave safety check technical field of imaging more particularly to a kind of MIMO imaging system calibration sides
Method and device.
Background technique
The attack of terrorism of recent domestic frequently occurs, and the type of dangerous goods is also more and more, traditional peace
Inspection means have been unsatisfactory for the demand in current safety check market.Traditional metal detector is only capable of detection metal contraband, to plastics
Bomb, sintex are all helpless；Although X-ray rays safety detection apparatus can detect all prohibited items, have to human health
Certain threat, nor optimal safety check means.Millimeter wave 3 dimension imaging technology is a kind of traditional safety check means of substitution at present
Effective ways.
The cylinder of L3 company scans the anti-of 3-D imaging system, the QPS 3-D imaging system of RS company and Smith company
Surface antenna battle array imaging system is penetrated, is all main millimeter wave 3-D imaging system currently on the market.Millimeter wave on the market at present
Rays safety detection apparatus is all the rays safety detection apparatus of formula, be not suitable with the public place of high-throughput to quickly, by formula and open
The demand of safety check.In order to improve image taking speed while not increase cost excessively, sparse face battle array such as MIMO is generallyd use
(Multiple-Input Multiple-Output, multiple-input, multiple-output) imaging system completes signal acquisition.However current
The characteristics of work of MIMO imaging system has with roomy in microwave and millimeter wave wave band, multichannel, this leads to the line of big bandwidth signal
Property degree, the consistent property of pair in channel and the consistent property of pair between channel be difficult to ensure that institute exists at image to be defocused, loses
The problems such as true.Currently, mainly completing the calibration of signal sensor gain and phase uncertainties using high-precision calibration component, but use high-precision
The complexity calibrated of calibration component and difficulty it is very high.
Summary of the invention
The embodiment of the present invention provides a kind of MIMO imaging system calibration method and device, to solve in the prior art using height
When the calibration component of precision calibrates MIMO imaging system, complexity and the high problem of difficulty.
In order to solve the above-mentioned technical problem, the present invention is implemented as follows:
In a first aspect, the embodiment of the invention provides a kind of MIMO imaging system calibration methods, wherein the method packet
It includes:
The transmitting antenna and receiving antenna in the first face of mimo antenna array are calibrated, and determine first face
The inconsistency parameter of transmission channel, the inconsistency parameter of the receiving channel in first face and the first optimal delay phase
Compensation term；
The transmitting antenna and receiving antenna in the second face of mimo antenna array are calibrated, and determine second face
The inconsistency parameter of transmission channel, the inconsistency parameter of the receiving channel in second face and the second optimal delay phase
Compensation term；Wherein, the inconsistency parameter includes: error distance calibration factor and amplitude calibration coefficient；
According to each inconsistency parameter, the first optimal delay phase compensation term and the second optimal delay
Phase compensation term calibrates MIMO imaging system echo data collected.
Preferably, the transmitting antenna and receiving antenna in first face to mimo antenna array are calibrated, and are determined
The inconsistency parameter and first of the inconsistency parameter of the transmission channel in first face, the receiving channel in first face
The step of optimal delay phase compensation term, comprising: the calibration mode of mimo antenna array is switched into the mimo antenna array
The first face transmitting unit emit radiofrequency signal to the second face receiving antenna unit；Determine the transmission channel in first face
Inconsistency parameter；The calibration mode of the mimo antenna array is switched to second face of the mimo antenna array
Transmitting unit emit radiofrequency signal to first face receiving antenna unit；Determine the receiving channel in first face not
Parameter of consistency；The inconsistency parameter of transmission channel according to first face, the receiving channel in first face it is different
Cause property parameter, determines the first optimal delay phase compensation term of the MIMO imaging system.
Preferably, the step of inconsistency parameter of the transmission channel in the determination first face, comprising: pass through signal
The calibration signal of processing unit acquisition first echo signal and the first linear FM signal, wherein the first echo signal is logical
The radiofrequency signal for the transmitting antenna transmitting for crossing the first face generates；Is extracted from the calibration signal of first linear FM signal
One linear FM signal calibration factor matrix；It will believe after the first echo signal Digital Down Convert with first linear frequency modulation
Number calibration factor matrix multiple, the first one-dimensional range profile signal after obtaining pulse pressure；According to first after the pulse pressure it is one-dimensional away from
From as signal, the error distance calibration factor and amplitude calibration coefficient of the transmission channel in first face are determined.
Preferably, the step of inconsistency parameter of the receiving channel in the determination first face, comprising: pass through signal
The calibration signal of processing unit acquisition second echo signal and the first linear FM signal, wherein the second echo signal is logical
The radiofrequency signal for the transmitting antenna transmitting for crossing the second face generates；Is extracted from the calibration signal of second linear FM signal
Bilinear FM signal calibration factor matrix；It will believe after the second echo signal Digital Down Convert with second linear frequency modulation
Number calibration factor matrix multiple, the second one-dimensional range profile signal after obtaining pulse pressure；According to second after the pulse pressure it is one-dimensional away from
From as signal, the error distance calibration factor and amplitude calibration coefficient of the receiving channel in first face are determined.
Preferably, described according to each inconsistency parameter, the first optimal delay phase compensation term and described
Second optimum angle compensation of delay item, the step of calibration to MIMO imaging system echo data collected, comprising: in institute
During stating MIMO imaging system images, by the first echo signal in collected first face multiplied by the hair in first face
Penetrate the error distance calibration factor in channel, the receiving channel in first face error distance calibration factor and described first most
Excellent delay phase compensation term, divided by the width of the receiving channel of the amplitude calibration coefficient and the first face of the transmission channel in first face
After spending calibration factor, target image is obtained using default imaging algorithm；By the second echo signal in collected second face
It is calibrated multiplied by the error distance of the error distance calibration factor of the transmission channel in second face, the receiving channel in second face
Coefficient and the second optimal delay phase compensation term, divided by the amplitude calibration coefficient of the transmission channel in second face and
After the amplitude calibration coefficient of the receiving channel in two faces, target image is obtained using default imaging algorithm.
Second aspect, the embodiment of the invention provides a kind of MIMO imaging system calibrating installation, wherein described device includes:
First calibration module, transmitting antenna and receiving antenna for the first face to mimo antenna array are calibrated,
And determine the inconsistency parameter of the transmission channel in first face, the inconsistency parameter of the receiving channel in first face with
And the first optimal delay phase compensation term；
Second calibration module, transmitting antenna and receiving antenna for the second face to mimo antenna array are calibrated,
And determine the inconsistency parameter of the transmission channel in second face, the inconsistency parameter of the receiving channel in second face with
And the second optimal delay phase compensation term；Wherein, the inconsistency parameter includes: error distance calibration factor and amplitude calibration
Coefficient；
Third calibration module, for according to each inconsistency parameter, the first optimal delay phase compensation term with
And the second optimum angle compensation of delay item, MIMO imaging system echo data collected is calibrated.
Preferably, first calibration module includes: the first switching submodule, for by the calibrating die of mimo antenna array
The transmitting unit that formula switches to the first face of the mimo antenna array emits the receiving antenna unit of radiofrequency signal to the second face；
First determines submodule, the inconsistency parameter of the transmission channel for determining first face；Second switching submodule, is used for
The calibration mode of the mimo antenna array is switched to the transmitting unit transmitting in second face of the mimo antenna array
Radiofrequency signal to first face receiving antenna unit；Second determines submodule, and the reception for determining first face is logical
The inconsistency parameter in road；Compensation term determines submodule, for the transmission channel according to first face inconsistency parameter,
The inconsistency parameter of the receiving channel in first face determines the first optimal delay phase compensation of the MIMO imaging system
?.
Preferably, described first determine that submodule includes: the first acquisition unit, for acquiring the by signal processing unit
The calibration signal of one echo-signal and the first linear FM signal, wherein the first echo signal passes through the transmitting in the first face
The radiofrequency signal of antenna transmitting generates；First extraction unit, for being mentioned from the calibration signal of first linear FM signal
Take the first linear FM signal calibration factor matrix；First pulse pressure unit is used for the first echo signal Digital Down Convert
Afterwards with the first linear FM signal calibration factor matrix multiple, the first one-dimensional range profile signal after obtaining pulse pressure；First
Factor determination unit, for determining the transmission channel in first face according to the first one-dimensional range profile signal after the pulse pressure
Error distance calibration factor and amplitude calibration coefficient.
Preferably, described second determine that submodule includes: the second acquisition unit, for acquiring the by signal processing unit
The calibration signal of two echo-signals and the first linear FM signal, wherein the second echo signal passes through the transmitting in the second face
The radiofrequency signal of antenna transmitting generates；Second extraction unit, for being mentioned from the calibration signal of second linear FM signal
Take the second linear FM signal calibration factor matrix；Second pulse pressure unit is used for the second echo signal Digital Down Convert
Afterwards with the second linear FM signal calibration factor matrix multiple, the second one-dimensional range profile signal after obtaining pulse pressure；Second
Factor determination unit, for determining the receiving channel in first face according to the second one-dimensional range profile signal after the pulse pressure
Error distance calibration factor and amplitude calibration coefficient.
Preferably, the third calibration module includes: the first submodule, in the MIMO imaging system images process
In, the first echo signal in collected first face is calibrated into system multiplied by the error distance of the transmission channel in first face
The error distance calibration factor of the receiving channel in several, described first face and the first optimal delay phase compensation term, divided by
After the amplitude calibration coefficient of the receiving channel of the amplitude calibration coefficient and the first face of the transmission channel in first face, using default
Imaging algorithm obtains target image；Second submodule, for by the second echo signal in collected second face multiplied by institute
State the error distance calibration factor of the transmission channel in the second face, the receiving channel in second face error distance calibration factor with
And the second optimal delay phase compensation term, amplitude calibration coefficient and the second face divided by the transmission channel in second face
After the amplitude calibration coefficient of receiving channel, target image is obtained using default imaging algorithm.
The present invention has the following beneficial effects: compared to the prior art
In MIMO imaging system calibration method provided in an embodiment of the present invention, respectively to the first face of mimo antenna array,
The transmitting antenna and receiving antenna in the second face are calibrated, and the inconsistency parameter of the transmission channel in determining first face,
The transmission channel of the inconsistency parameter of the receiving channel in first face and the first optimal delay phase compensation term, the second face
Inconsistency parameter, the inconsistency parameter of the receiving channel in second face and the second optimal delay phase compensation term,
It is right according to each inconsistency parameter, the first optimal delay phase compensation term and the second optimum angle compensation of delay item
MIMO imaging system echo data collected is calibrated, and core is the calibration using opposite antenna array receiver transmitting unit
Method no longer needs to prepare high-precision calibration component, can reduce the complexity and difficulty of system calibration, makes the calibration of system more
It is convenient, it is convenient.
Detailed description of the invention
Fig. 1 is a kind of flow chart of according to embodiments of the present invention one MIMO imaging system calibration method；
Fig. 2 is MIMO imaging system schematic three dimensional views；
Fig. 3 is a kind of flow chart of according to embodiments of the present invention two MIMO imaging system calibration method；
Fig. 4 is a kind of structural block diagram of according to embodiments of the present invention three MIMO imaging system calibrating installation；
Fig. 5 is a kind of structural block diagram of MIMO imaging system calibrating installation of the embodiment of the present invention four.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Embodiment one
Referring to Fig.1, the flow chart of MIMO imaging system calibration method provided in an embodiment of the present invention is shown.
The MIMO imaging system calibration method of the embodiment of the present invention the following steps are included:
Step 101: the transmitting antenna and receiving antenna in the first face of mimo antenna array being calibrated, and described in determination
The inconsistency parameter of the transmission channel in the first face, the inconsistency parameter of the receiving channel in first face and first are optimal
Delay phase compensation term.
Attached drawing 2 is the schematic three dimensional views of MIMO imaging system.Common MIMO imaging system includes: two or more
The composition such as mimo antenna array, highly integrated mmic chip, signal processor and display terminal.On each antenna plane
There are M transmission antenna unit, N number of receiving antenna unit, M transmission antenna unit corresponds to M transmission channel, N number of receiving antenna
Unit corresponds to N number of receiving channel.Can be by M transmission antenna unit transmitted in sequence of switch control, N number of receiving antenna unit is same
When receive.In the present invention, 100≤M≤5000,100≤N≤5000.Minimum interval between two antennas is a wavelength
λ.It is more that the form of transmitting unit and receiving unit can be electromagnetic horn, dielectric rod antenna, microstrip antenna, Waveguide slot antenna etc.
Kind antenna form, the bore of antenna are a wavelength X, and the beam angle of antenna is 30 degree -150 and spends, preferably 80 degree.
Inconsistency parameter includes: error distance calibration factor and amplitude calibration coefficient.It needs first to carry out one in this step
Secondary antenna calibrates the error distance calibration factor and amplitude calibration coefficient of the transmission channel in first face that determines, then carries out a secondary antenna
The error distance calibration factor and amplitude calibration coefficient of the receiving channel in first face that determines are calibrated, finally determines the first optimal delay
Phase compensation term.
Step 102: the transmitting antenna and receiving antenna in the second face of mimo antenna array being calibrated, and described in determination
The inconsistency parameter of the transmission channel in the second face, the inconsistency parameter of the receiving channel in second face and second are optimal
Delay phase compensation term.
Need first to carry out the mistake of the transmission channel in the second face that an antenna calibration determines mimo antenna array in this step
Poor range calibration coefficient and amplitude calibration coefficient, then carry out the reception that an antenna calibration determines the second face of mimo antenna array
The error distance calibration factor and amplitude calibration coefficient in channel finally determine the second optimal delay phase compensation term.For specific
Method of determination can be configured according to actual needs by those skilled in the art, not do specific limit in the embodiment of the present invention to this
System.
Step 103: according to each inconsistency parameter, the first optimal delay phase compensation term and described second
Optimal delay phase compensation term calibrates MIMO imaging system echo data collected.
During MIMO imaging system images, by the first echo signal in collected first face multiplied by the hair in the first face
Penetrate the error distance calibration factor in channel, the error distance calibration factor of the receiving channel in the first face and the first optimal delay phase
Position compensation term, divided by the amplitude calibration coefficient of the receiving channel of the amplitude calibration coefficient and the first face of the transmission channel in the first face
Afterwards, target image is obtained using default imaging algorithm；By the second echo signal in collected second face multiplied by the hair in the second face
Penetrate the error distance calibration factor in channel, the error distance calibration factor of the receiving channel in the second face and the second optimal delay phase
Position compensation term, divided by the amplitude calibration coefficient of the receiving channel of the amplitude calibration coefficient and the second face of the transmission channel in the second face
Afterwards, target image is obtained using default imaging algorithm.
MIMO imaging system calibration method provided in an embodiment of the present invention, respectively to the first face of mimo antenna array,
The transmitting antenna and receiving antenna in two faces are calibrated, and determine the inconsistency parameter of the transmission channel in first face, institute
State the inconsistency parameter of the receiving channel in the first face and the transmission channel of the first optimal delay phase compensation term, the second face
Inconsistency parameter, the inconsistency parameter of the receiving channel in second face and the second optimal delay phase compensation term, according to
According to each inconsistency parameter, the first optimal delay phase compensation term and the second optimum angle compensation of delay item, to MIMO
Imaging system echo data collected is calibrated, and core is the calibration side using opposite antenna array receiver transmitting unit
Method no longer needs to prepare high-precision calibration component, can reduce the complexity and difficulty of system calibration, keeps the calibration of system more square
Just, convenient.
Embodiment two
Referring to Fig. 3, the flow chart of MIMO imaging system calibration method provided in an embodiment of the present invention is shown.
The MIMO imaging system calibration method of the embodiment of the present invention the following steps are included:
Step 201: the calibration mode of mimo antenna array is switched to the transmitting in the first face of the mimo antenna array
Unit emits the receiving antenna unit of radiofrequency signal to the second face.
Mimo antenna array includes two faces, respectively the first face and the second face, is separately included on the first face and the second face
Multiple receiving antennas and multiple transmitting antennas, antenna can be described as antenna element again.
In this step, mimo antenna battle array is switched to the first surface launching antenna calibration mode of calibration mode, the first face
Transmission antenna unit successively emits radiofrequency signal to some receiving antenna unit of the second face, and by the second face, the receiving antenna unit is connect
It receives, and sends reception signal to the reception chip in the second face, do the reception processing including dechirp processing in chip receiving
Afterwards, signal processing unit is sent a signal to, which is then first echo signal.
Step 202: determining the inconsistency parameter of the transmission channel in first face.
A kind of mode of inconsistency parameter preferably determining the transmission channel in the first face includes:
Firstly, the calibration signal of first echo signal and the first linear FM signal is acquired by signal processing unit,
In, the first echo signal is generated by the radiofrequency signal that the transmitting antenna in the first face emits；
Signal processing unit acquires the calibration signal of linear FM signal, the calibration letter while acquiring first echo signal
Number Sref_correction (t) is to generate the signal of the VCO signal of linear FM signal after 20 times of frequency dividings by acquisition to obtain
, send the calibration signal Sref_correction (t) after acquisition to signal processing unit, wherein time variable t ∈ [0,
T], T is pulse width.
Secondly, extracting the first linear FM signal calibration factor matrix from the calibration signal of the first linear FM signal；
Calibration signal Sref_correction (t) is filtered out into high order phase term, filtering method by the method filtered first
Filter method including the routine such as Fourier Transform Filtering method, the filter method based on polynomial interopolation or FIR filter method.Filter out high order
The calibration signal of phase term is Sref ' _ correction (t).Then range direction variable R (n) is discrete for NzA distance is single
Member, the cell spacing of distance unit are Δ z, and, Δ z is less than or equal to distance resolution, n ∈ [0, NZ], each distance unit
Delay phase is exp (j4 π fR (n)/c).WhereinfsFor the sample rate for receiving signal.High order phase will be filtered out
Calibration signal Sref ' _ correction (t) of position item does Fourier transformation and is transformed into after frequency domain multiplied by delay phase item exp (j4
π fR (n)/c), obtain the correction signal Sref ' of frequency domainfft_ correction (f, n), is then transformed into through inverse Fourier transform
Time domain, to obtain transition matrix the first linear FM signal calibration factor matrix Sref ' about time and distanceT_
Correction (m, n), wherein [0, Nf] m ∈.
Again, it, with the first linear FM signal calibration factor matrix multiple, will be obtained after first echo signal Digital Down Convert
The first one-dimensional range profile signal after to pulse pressure；
Finally, determining the mistake of the transmission channel in first face according to the first one-dimensional range profile signal after the pulse pressure
Poor range calibration coefficient and amplitude calibration coefficient.
Signal S ' after signal s (m) Digital Down Convert (DDC) received, after obtaining Digital Down ConvertT(m) and turn
Change matrix S 'T_ correction (m, n) is multiplied, and while completing linear FM signal linearity correction, completes range direction
Pulse pressure, the one-dimensional range profile signal S " after obtaining pulse pressureT(n) i.e. the first one-dimensional range profile signal.Seek one-dimensional distance after pulse pressure
As signal S "T(n) maximum value position Pos (nT) and amplitude calibration coefficient Amp (nT), wherein nt∈[0,NT], and NTFor transmitting
The number of unit, thus distance R of the first surface launching antenna measured to the second face receiving antennatestFor Pos (nT)Δz。
It is (x that known second face, which is chosen for the position where the receiving antenna of calibration,0R,y0R,z0R), the position of the first surface launching antenna
For (xT,yT,zT), then the first surface launching antenna to the second face chooses the theoretical distance R of the receiving antenna for calibrationrealForIt then chooses and is used as in some transmission antenna unit to the second face on the first face
The error distance calibration factor Δ R of the receiving unit of calibrationtFor (Rtest(nT)-Rreal(nT)).By Δ RTWith Amp (nT) be saved in
In memory, the parameter extraction of the first surface launching difference between channels is completed.
Step 203: the calibration mode of the mimo antenna array is switched to described the second of the mimo antenna array
The transmitting unit in face emits the receiving antenna unit of radiofrequency signal to first face.
Mimo antenna battle array is switched to the first face receiving antenna calibration mode of calibration mode, the receiving antenna unit in the first face
The transmitting signal of some transmission antenna unit chosen of the second face is received simultaneously, and sends reception signal to the reception in the first face
Chip sends a signal to signal processing unit, the letter after receiving the reception processing done in chip and handled including dechirp
It number is then second echo signal.
Step 204: determining the inconsistency parameter of the receiving channel in first face.
The concrete mode of the inconsistency parameter of the receiving channel in the first face is determined, referring to the one of the transmission channel in the first face
Cause property parameter method of determination can be specifically:
Firstly, the calibration signal of second echo signal and the second linear FM signal is acquired by signal processing unit,
In, the second echo signal is generated by the radiofrequency signal that the transmitting antenna in the second face emits；
Secondly, extracting the second linear FM signal calibration factor square from the calibration signal of second linear FM signal
Battle array；
Again, by after the second echo signal Digital Down Convert with the second linear FM signal calibration factor matrix
It is multiplied, the second one-dimensional range profile signal after obtaining pulse pressure；
Finally, determining the mistake of the receiving channel in first face according to the second one-dimensional range profile signal after the pulse pressure
Poor range calibration coefficient and amplitude calibration coefficient.
Linear FM signal calibration factor matrix i.e. the second linear frequency modulation letter is obtained using with mode identical in step 202
Number calibration factor matrix Sref 'R_correction(m,n).Then the signal S that will be receivedR(m) after Digital Down Convert (DDC),
Signal S ' after obtaining Digital Down ConvertR(m) with transition matrix obtained above i.e. the second linear FM signal calibration factor square
Battle array Sref 'R_ correction (m, n) is multiplied, and while completing linear FM signal linearity correction, completes range direction
Pulse pressure, the second one-dimensional range profile signal S " after obtaining pulse pressureR(n).The second one-dimensional range profile signal S " after seeking pulse pressureR(n)
Maximum value position Pos ' (nR) and amplitude A mp ' (nR), wherein nR∈[0,NR], and NRFor the number of receiving unit, to obtain
The distance R' of the selected transmitting antenna of the first face receiving antenna to the second face measuredtestFor Pos ' (nR)Δz.Known second face
Choosing for the position where the transmitting antenna of calibration is (x0T,y0T,z0T), the position of the first face receiving antenna is (xR,yR,
zR), then the first surface launching antenna to the second face chooses the theoretical distance R ' of the receiving antenna for calibrationrealForIt then chooses and is used as in some transmission antenna unit to the second face on the first face
The range error Δ R of the receiving unit of calibrationRFor (R 'test(nR)-R′real(nR)).The error distance of receiving channel is calibrated into system
Number Δ RRWith the amplitude calibration coefficient Amp ' (n of receiving channelR) be saved in memory, it is inconsistent to complete the first face receiving channel
The parameter extraction of property.
Step 205: the inconsistency parameter of the transmission channel according to first face, the receiving channel in first face
Inconsistency parameter determines the first optimal delay phase compensation term of the MIMO imaging system.
In the normal mode of operation, one group of sky background echo signals is acquired, collected echo-signal is logical multiplied by transmitting
The error distance calibration factor exp (j (k of road receiving channelf_kfc)(-ΔRT-ΔRR)), center wave number kfc=2 π λ c ', wave number kf
=2 π λ ', λ ' are a series of wavelength in bandwidth of operation, λ ' ∈ [λ 'min,λ′max],λ′minFor the minimum wavelength in working band,
λ′maxFor the maximum wavelength in working band, λ c ' is the central wavelength of work, then the amplitude divided by transmission channel and receiving channel
Calibration factor Amp (nT) and Amp ' (nR).Then the echo-signal multiplied by error distance correction coefficient and amplitude correction coefficient is done
Fourier transformation measures the position Pos " where maximum value, then measuring to the distance of surface antenna is Pos " Δ z, it is known that opposite day
The actual range of line is R "real, optimal delay distance is Ropt=Pos " (n) Δ z-R "real, pass through well known BP imaging algorithm pair
Opposite array is imaged, and saves the first optimal delay phase compensation term exp (j (kf_kfc)Ropt).Wherein optimal delay
Distance is Ropt。
Step 206: the transmitting antenna and receiving antenna in the second face of mimo antenna array being calibrated, and described in determination
The inconsistency parameter of the transmission channel in the second face, the inconsistency parameter of the receiving channel in second face and second are optimal
Delay phase compensation term.
Wherein, inconsistency parameter includes: error distance calibration factor and amplitude calibration coefficient.
Step 201 to step 205 is to calibrate to the transmitting antenna and receiving antenna in the first face of mimo antenna array,
And determine the inconsistency parameter of the transmission channel in the first face, the inconsistency parameter and first of the receiving channel in the first face most
Identical mode can be used during specific implementation and determine the second surface launching for the specific implementation flow of excellent delay phase compensation term
Inconsistency parameter, the inconsistency parameter of the receiving channel in the second face and the second optimal delay phase compensation term in channel.
Step 207: according to each inconsistency parameter, the first optimal delay phase compensation term and described second
Optimum angle compensation of delay item calibrates MIMO imaging system echo data collected.
In imaging process later, the echo-signal in collected first face is missed multiplied by transmission channel and receiving channel
Poor range calibration coefficient exp (j (kf_kfc)(-ΔRT-ΔRR)) and the first delay phase compensation term exp (j (kf_kfc)Ropt),
Divided by the amplitude calibration coefficient Amp (n of transmission channel and receiving channelT) and Amp ' (nR).It is tested with well known imaging algorithm
The optimum image of target.The echo-signal in the second face also executes identical operation, and the echo-signal in the second face is logical multiplied by transmitting
Road and receiving channel error distance calibration factor and the second delay phase compensation term, divided by the width of transmission channel and receiving channel
Calibration factor is spent, the optimum image of measured target is obtained with well known imaging algorithm.
MIMO imaging system calibration method provided in an embodiment of the present invention, respectively to the first face of mimo antenna array,
The transmitting antenna and receiving antenna in two faces are calibrated, and determine the inconsistency parameter of the transmission channel in first face, institute
State the inconsistency parameter of the receiving channel in the first face and the transmission channel of the first optimal delay phase compensation term, the second face
Inconsistency parameter, the inconsistency parameter of the receiving channel in second face and the second optimal delay phase compensation term, according to
According to each inconsistency parameter, the first optimal delay phase compensation term and the second optimum angle compensation of delay item, to MIMO
Imaging system echo data collected is calibrated, and core is the calibration side using opposite antenna array receiver transmitting unit
Method no longer needs to prepare high-precision calibration component, can reduce the complexity and difficulty of system calibration, keeps the calibration of system more square
Just, convenient.
Embodiment three
Referring to Fig. 4, the structural block diagram of MIMO imaging system calibrating installation provided in an embodiment of the present invention is shown.MIMO at
It is able to achieve the details of the MIMO imaging system calibration method in previous embodiment as system calibration equipment, and reaches identical effect
Fruit.
The MIMO imaging system calibrating installation of the embodiment of the present invention includes: the first calibration module 301, for mimo antenna
The transmitting antenna and receiving antenna in the first face of array are calibrated, and determine the inconsistency of the transmission channel in first face
Parameter, the inconsistency parameter of the receiving channel in first face and the first optimal delay phase compensation term；
Second calibration module 302, transmitting antenna and receiving antenna for the second face to mimo antenna array carry out school
Standard, and determine the inconsistency parameter of the transmission channel in second face, the inconsistency of the receiving channel in second face ginseng
Several and the second optimal delay phase compensation term；Wherein, the inconsistency parameter includes: error distance calibration factor and amplitude
Calibration factor；
Third calibration module 303, for according to each inconsistency parameter, the first optimal delay phase compensation term
And the second optimum angle compensation of delay item, MIMO imaging system echo data collected is calibrated.
MIMO imaging system calibrating installation provided in an embodiment of the present invention, respectively to the first face of mimo antenna array,
The transmitting antenna and receiving antenna in two faces are calibrated, and determine the inconsistency parameter of the transmission channel in first face, institute
State the inconsistency parameter of the receiving channel in the first face and the transmission channel of the first optimal delay phase compensation term, the second face
Inconsistency parameter, the inconsistency parameter of the receiving channel in second face and the second optimal delay phase compensation term, according to
According to each inconsistency parameter, the first optimal delay phase compensation term and the second optimum angle compensation of delay item, to MIMO
Imaging system echo data collected is calibrated, and core is the calibration side using opposite antenna array receiver transmitting unit
Method no longer needs to prepare high-precision calibration component, can reduce the complexity and difficulty of system calibration, keeps the calibration of system more square
Just, convenient.
Example IV
Referring to Fig. 5, the structural block diagram of MIMO imaging system calibrating installation provided in an embodiment of the present invention is shown.
MIMO imaging system calibrating installation provided in an embodiment of the present invention is to the further of device described in embodiment three
Optimization, the MIMO imaging system calibrating installation after optimization includes: the first calibration module 401, for the to mimo antenna array
Transmitting antenna and receiving antenna on one side is calibrated, and determines the inconsistency parameter of the transmission channel in first face, institute
State the inconsistency parameter and the first optimal delay phase compensation term of the receiving channel in the first face；
Second calibration module 402, transmitting antenna and receiving antenna for the second face to mimo antenna array carry out school
Standard, and determine the inconsistency parameter of the transmission channel in second face, the inconsistency of the receiving channel in second face ginseng
Several and the second optimal delay phase compensation term；Wherein, the inconsistency parameter includes: error distance calibration factor and amplitude
Calibration factor；
Third calibration module 403, for according to each inconsistency parameter, the first optimal delay phase compensation term
And the second optimum angle compensation of delay item, MIMO imaging system echo data collected is calibrated.
Preferably, first calibration module 401 includes: the first switching submodule 4011, is used for mimo antenna array
Calibration mode switch to the mimo antenna array the first face transmitting unit emit radiofrequency signal to the second face reception
Antenna element；First determines submodule 4012, the inconsistency parameter of the transmission channel for determining first face；Second cuts
Submodule 4013 is changed, for the calibration mode of the mimo antenna array to be switched to described the second of the mimo antenna array
The transmitting unit in face emits the receiving antenna unit of radiofrequency signal to first face；Second determines submodule 4014, for true
The inconsistency parameter of the receiving channel in fixed first face；Compensation term determines submodule 4015, for according to first face
Transmission channel inconsistency parameter, the inconsistency parameter of the receiving channel in first face, determine MIMO imaging
The optimal delay phase compensation term of the first of system.
Preferably, described first determine that submodule includes: the first acquisition unit, for acquiring the by signal processing unit
The calibration signal of one echo-signal and the first linear FM signal, wherein the first echo signal passes through the transmitting in the first face
The radiofrequency signal of antenna transmitting generates；First extraction unit, for being mentioned from the calibration signal of first linear FM signal
Take the first linear FM signal calibration factor matrix；First pulse pressure unit is used for the first echo signal Digital Down Convert
Afterwards with the first linear FM signal calibration factor matrix multiple, the first one-dimensional range profile signal after obtaining pulse pressure；First
Factor determination unit, for determining the transmission channel in first face according to the first one-dimensional range profile signal after the pulse pressure
Error distance calibration factor and amplitude calibration coefficient.
Preferably, described second determine that submodule includes: the second acquisition unit, for acquiring the by signal processing unit
The calibration signal of two echo-signals and the first linear FM signal, wherein the second echo signal passes through the transmitting in the second face
The radiofrequency signal of antenna transmitting generates；Second extraction unit, for being mentioned from the calibration signal of second linear FM signal
Take the second linear FM signal calibration factor matrix；Second pulse pressure unit is used for the second echo signal Digital Down Convert
Afterwards with the second linear FM signal calibration factor matrix multiple, the second one-dimensional range profile signal after obtaining pulse pressure；Second
Factor determination unit, for determining the receiving channel in first face according to the second one-dimensional range profile signal after the pulse pressure
Error distance calibration factor and amplitude calibration coefficient.
Preferably, the third calibration module 403 includes: the first submodule 4031, in the MIMO imaging system
In imaging process, by the first echo signal in collected first face multiplied by the transmission channel in first face error away from
From calibration factor, the error distance calibration factor of the receiving channel in first face and the first optimal delay phase compensation
, after the amplitude calibration coefficient divided by the receiving channel of the amplitude calibration coefficient and the first face of the transmission channel in first face,
Target image is obtained using default imaging algorithm；Second submodule 4032, for by second time of collected second face
Wave signal multiplied by the error distance calibration factor of the transmission channel in second face, the receiving channel in second face error away from
From calibration factor and the second optimal delay phase compensation term, divided by the amplitude calibration system of the transmission channel in second face
After the amplitude calibration coefficient of several and the second face receiving channel, target image is obtained using default imaging algorithm.
MIMO imaging system calibrating installation provided in an embodiment of the present invention can be realized in the embodiment of the method for Fig. 1 to Fig. 3
Each process, to avoid repeating, which is not described herein again.
MIMO imaging system calibrating installation provided in an embodiment of the present invention, MIMO imaging system calibration method are right respectively
First face of mimo antenna array, the transmitting antenna in the second face and receiving antenna are calibrated, and determine the hair in first face
The inconsistency parameter in channel, the inconsistency parameter of the receiving channel in first face and the first optimal delay phase is penetrated to mend
Repay item, the inconsistency parameter of the transmission channel in the second face, the inconsistency parameter of the receiving channel in second face and
Two optimal delay phase compensation terms, most according to each inconsistency parameter, the first optimal delay phase compensation term and described second
Excellent phase delay compensation term calibrates MIMO imaging system echo data collected, and core is using opposite antenna array
Column receive transmitting unit calibration method, no longer need to prepare high-precision calibration component, can reduce system calibration complexity and
Difficulty keeps the calibration of system more convenient, convenient.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical solution of the present invention substantially in other words does the prior art
The part contributed out can be embodied in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal (can be mobile phone, computer, service
Device, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form belongs within protection of the invention.
Claims (10)
1. a kind of MIMO imaging system calibration method, which is characterized in that the described method includes:
The transmitting antenna and receiving antenna in the first face of mimo antenna array are calibrated, and determine the transmitting in first face
The inconsistency parameter in channel, the inconsistency parameter of the receiving channel in first face and the first optimal delay phase compensation
?；
The transmitting antenna and receiving antenna in the second face of mimo antenna array are calibrated, and determine the transmitting in second face
The inconsistency parameter in channel, the inconsistency parameter of the receiving channel in second face and the second optimal delay phase compensation
?；Wherein, the inconsistency parameter includes: error distance calibration factor and amplitude calibration coefficient；
According to each inconsistency parameter, the first optimal delay phase compensation term and the second optimal delay phase
Compensation term calibrates MIMO imaging system echo data collected.
2. the method according to claim 1, wherein the transmitting antenna in first face to mimo antenna array
It is calibrated with receiving antenna, and determines the reception of the inconsistency parameter, first face of the transmission channel in first face
The step of inconsistency parameter in channel and the first optimal delay phase compensation term, comprising:
The transmitting unit that the calibration mode of mimo antenna array switches to the first face of the mimo antenna array is emitted into radio frequency
Signal to the second face receiving antenna unit；
Determine the inconsistency parameter of the transmission channel in first face；
The calibration mode of the mimo antenna array is switched to the transmitting unit in second face of the mimo antenna array
Emit the receiving antenna unit of radiofrequency signal to first face；
Determine the inconsistency parameter of the receiving channel in first face；
The inconsistency parameter of transmission channel according to first face, the inconsistency of the receiving channel in first face ginseng
Number, determines the first optimal delay phase compensation term of the MIMO imaging system.
3. according to the method described in claim 2, it is characterized in that, the transmission channel in the determination first face it is inconsistent
The step of property parameter, comprising:
Pass through the calibration signal that signal processing unit acquires first echo signal and the first linear FM signal, wherein described the
One echo-signal is generated by the radiofrequency signal that the transmitting antenna in the first face emits；
The first linear FM signal calibration factor matrix is extracted from the calibration signal of first linear FM signal；
It, with the first linear FM signal calibration factor matrix multiple, will be obtained after the first echo signal Digital Down Convert
The first one-dimensional range profile signal after pulse pressure；
According to the first one-dimensional range profile signal after the pulse pressure, the error distance calibration of the transmission channel in first face is determined
Coefficient and amplitude calibration coefficient.
4. according to the method described in claim 2, it is characterized in that, the receiving channel in the determination first face it is inconsistent
The step of property parameter, comprising:
Pass through the calibration signal that signal processing unit acquires second echo signal and the first linear FM signal, wherein described the
Two echo-signals are generated by the radiofrequency signal that the transmitting antenna in the second face emits；
The second linear FM signal calibration factor matrix is extracted from the calibration signal of second linear FM signal；
It, with the second linear FM signal calibration factor matrix multiple, will be obtained after the second echo signal Digital Down Convert
The second one-dimensional range profile signal after pulse pressure；
According to the second one-dimensional range profile signal after the pulse pressure, the error distance calibration of the receiving channel in first face is determined
Coefficient and amplitude calibration coefficient.
5. the method according to claim 1, wherein described according to each inconsistency parameter, described first
Optimal delay phase compensation term and the second optimal delay phase compensation term, to MIMO imaging system number of echoes collected
According to the step of being calibrated, comprising:
During the MIMO imaging system images, by the first echo signal in collected first face multiplied by described
The error distance calibration factor of transmission channel on one side, first face receiving channel error distance calibration factor and institute
The first optimal delay phase compensation term is stated, divided by the amplitude calibration coefficient of the transmission channel in first face and the reception in the first face
After the amplitude calibration coefficient in channel, target image is obtained using default imaging algorithm；
The second echo signal in collected second face is calibrated multiplied by the error distance of the transmission channel in second face
Coefficient, second face receiving channel error distance calibration factor and the second optimal delay phase compensation term, remove
After the amplitude calibration coefficient of the transmission channel in second face and the amplitude calibration coefficient of the receiving channel in the second face, using pre-
If imaging algorithm obtains target image.
6. a kind of MIMO imaging system calibrating installation, which is characterized in that described device includes:
First calibration module, transmitting antenna and receiving antenna for the first face to mimo antenna array are calibrated, and really
The inconsistency parameter of transmission channel in fixed first face, the inconsistency parameter of the receiving channel in first face and the
One optimal delay phase compensation term；
Second calibration module, transmitting antenna and receiving antenna for the second face to mimo antenna array are calibrated, and really
The inconsistency parameter of transmission channel in fixed second face, the inconsistency parameter of the receiving channel in second face and the
Two optimal delay phase compensation terms；Wherein, the inconsistency parameter includes: error distance calibration factor and amplitude calibration system
Number；
Third calibration module, for according to each inconsistency parameter, the first optimal delay phase compensation term and institute
The second optimum angle compensation of delay item is stated, MIMO imaging system echo data collected is calibrated.
7. device according to claim 6, which is characterized in that first calibration module includes:
First switching submodule, for the calibration mode of mimo antenna array to be switched to the first face of the mimo antenna array
Transmitting unit emit radiofrequency signal to the second face receiving antenna unit；
First determines submodule, the inconsistency parameter of the transmission channel for determining first face；
Second switching submodule, for the calibration mode of the mimo antenna array to be switched to the institute of the mimo antenna array
The transmitting unit for stating the second face emits the receiving antenna unit of radiofrequency signal to first face；
Second determines submodule, the inconsistency parameter of the receiving channel for determining first face；
Compensation term determines submodule, for the inconsistency parameter of the transmission channel according to first face, first face
The inconsistency parameter of receiving channel determines the first optimal delay phase compensation term of the MIMO imaging system.
8. device according to claim 7, which is characterized in that described first determines that submodule includes:
First acquisition unit, for acquiring the calibration of first echo signal and the first linear FM signal by signal processing unit
Signal, wherein the first echo signal is generated by the radiofrequency signal that the transmitting antenna in the first face emits；
First extraction unit, for extracting the first linear FM signal school from the calibration signal of first linear FM signal
Quasi- coefficient matrix；
First pulse pressure unit, for will be calibrated after the first echo signal Digital Down Convert with first linear FM signal
Coefficient matrix is multiplied, the first one-dimensional range profile signal after obtaining pulse pressure；
First factor determination unit, for determining first face according to the first one-dimensional range profile signal after the pulse pressure
The error distance calibration factor and amplitude calibration coefficient of transmission channel.
9. device according to claim 7, which is characterized in that described second determines that submodule includes:
Second acquisition unit, for acquiring the calibration of second echo signal and the first linear FM signal by signal processing unit
Signal, wherein the second echo signal is generated by the radiofrequency signal that the transmitting antenna in the second face emits；
Second extraction unit, for extracting the second linear FM signal school from the calibration signal of second linear FM signal
Quasi- coefficient matrix；
Second pulse pressure unit, for will be calibrated after the second echo signal Digital Down Convert with second linear FM signal
Coefficient matrix is multiplied, the second one-dimensional range profile signal after obtaining pulse pressure；
Second factor determination unit, for determining first face according to the second one-dimensional range profile signal after the pulse pressure
The error distance calibration factor and amplitude calibration coefficient of receiving channel.
10. device according to claim 6, which is characterized in that the third calibration module includes:
First submodule is used for during the MIMO imaging system images, by first time of collected first face
Wave signal multiplied by the error distance calibration factor of the transmission channel in first face, the receiving channel in first face error away from
From calibration factor and the first optimal delay phase compensation term, divided by the amplitude calibration system of the transmission channel in first face
After the amplitude calibration coefficient of several and the first face receiving channel, target image is obtained using default imaging algorithm；
Second submodule, for the transmission channel by the second echo signal in collected second face multiplied by second face
Error distance calibration factor, second face receiving channel error distance calibration factor and the second optimal delay
Phase compensation term, divided by the amplitude calibration of the receiving channel of the amplitude calibration coefficient and the second face of the transmission channel in second face
After coefficient, target image is obtained using default imaging algorithm.
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