CN102136860A - Channel correction system and method for transmission digital beam forming technology - Google Patents
Channel correction system and method for transmission digital beam forming technology Download PDFInfo
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Abstract
The invention discloses a transmission channel error correction system and a transmission channel error correction method for a transmission digital beam forming technology. The system comprises a transmission channel, a weight control unit, a digital beam forming unit, a synthesis unit, a vector network analyzer, a receiving processing unit, a correction calculation unit and a storage unit. The method provided by the invention comprises the following steps of: 1, acquiring an internal correction coefficient, a system correction coefficient and an external correction coefficient; 2, judging whether the correction coefficients are required to be corrected or not, turning to a step 3 if the correction coefficients are required to be corrected, otherwise turning to the step 5; 3, updating the internal correction coefficient; 4, updating the system correction coefficient; 5, correcting a transmission channel; and 6, judging whether to stop the correction or not, finishing the correction of the correction is judged to be stopped, otherwise turning to the step 2. By the method provided by the invention, a calculated amount is greatly reduced, and the utilization of equipment is reduced; and beam forming weights in the transmission digital beam forming technology are fully utilized, and the output of the transmission channel is flexibly controlled to ensure the consistence of correction signal characteristic parameters of each transmission channel and more effectively form expected beams.
Description
Technical field
The present invention relates to the radar control communication technical field, further relate to a kind of system and method that is used for correct transmission digital beam formation technology channel error, be used for solving the many antennas of emission digital beam formation system and penetrate the passage width of cloth with pilosity and respond inconsistent problem mutually.
Background technology
At present, in the radar control communication technical field, correct transmission digital beam system amplitude phase error mainly adopts just two kinds of methods of injection reference correction and school for the blind both at home and abroad.
People such as leaf cleaning politics, economics, organization, and ideology disclose a kind of injection with reference to bearing calibration in its patent application document " a kind of method and system of transmitting channel correction " (publication number CN101304276A, application number 200810029111, applying date 2008.6.30).This method is the injection channel correction signal in each transmission channel, receives the channel correcting signal by each emission, goes out the correction coefficient of each transmission channel according to the channel correcting calculated signals that receives.This method can only be proofreaied and correct the passage from base band to the transmitting antenna mouth, and can not proofread and correct the whole transmission channel that comprises transmitting antenna.When injecting correction signal, need between each transmission channel, take turns to inject, be difficult to guarantee the consistency of correction signal characterisitic parameter in each transmission channel.
S.Kobayakawa, people such as M.Tsutsui and Y.Tanaka are at document " A Blind Calibration Method for an Adaptive Array Antena in DS-CDMA System Using an MMSE Algorithm " (VTC2000-Spring Tokyo.2000IEEE 51st, Vol 1, and page 21) in a kind of school for the blind equipment is disclosed.This device adopts the NLMS adaptive algorithm, and the reference signal that obtains directly being coupled from the transmitting antenna passage and the sampled signal of each radio-frequency channel of process transmitting antenna are done interative computation, thereby obtain the correction weights of each transmission channel.Blind correction method requires harsh to the signal data of applied environment and collection.Its requires by the direct reference signal data that obtain of coupling and through the sampled data strict synchronism of each radio-frequency channel of transmitting antenna of transmitting antenna passage, otherwise the adaptive iteration algorithm will disperse, and does not reach the purpose of correction.Yet in the communication environment of reality, the sampled data of the reference signal data that the direct coupling of transmitting antenna passage obtains and each radio-frequency channel of process transmitting antenna is difficult to accomplish strict synchronism, so blind correction method is difficult to direct application in emission digital beam formation technology.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of corrective system based on emission digital beam formation technology has been proposed, and the method for using this system compensation transmission channel amplitude phase error, thereby can make the width of cloth of each transmission channel in the emission digital beam formation technology respond unanimity mutually.
Channel error corrective system of the present invention comprises that transmission channel, weights control unit, digital beam form (Digital Beam Forming, DBF) unit, synthesis unit, arrow net analyzer, reception processing unit, correction calculation unit and memory cell.Transmission channel comprises a plurality of transmitters and transmitting antenna passage.The weights control unit links to each other with the DBF unit by bus, and the DBF unit links to each other with transmitter by coaxial cable, and the output of transmitter links to each other with transmitting antenna by coaxial cable.The synthesis unit input links to each other with transmitter by coupler, and output links to each other with vowing the net analyzer by coaxial cable.The output of receiving element links to each other with correction calculation unit by bus.Memory cell links to each other with the weights control unit with correction calculation unit by bus.
Use amplitude and phase error correction of the present invention system as follows to the step of N transmission channel realization amplitude and phase error correction in the emission digital beam formation technology:
(1) obtains interior correction coefficient.
1a) choose one wantonly as standard channel in N transmission channel, correction coefficient is 1 in the passage that sets up standard; In the transmission channel of the N-1 except that standard channel, choose one wantonly as passage to be measured.
1b) the weights control unit is exported one group of wave beam and is formed weights to the DBF unit, and the weights that wave beam forms weights standard channel and passage to be measured are set to 1, and the weights of all the other N-2 passage are set to 0.
1c) correction signal is input to the DBF unit, the DBF unit forms weights with the correction signal that receives through preliminary treatment and wave beam and multiplies each other and obtain N roadbed band digital complex signal, obtains N road intermediate frequency through up-conversion and simulates real signal and give transmitter.
1d) synthesis unit is coupled out N road radiofrequency signal through transmitter, the radiofrequency signal of standard channel is directly given vow the net analyzer as standard signal, and the radiofrequency signal of all the other N-1 passage synthetic a tunnel is given and vowed that the net analyzer is as measured signal.
1e) from vowing that the net analyzer reads phase difference and the amplitude difference of measured signal with respect to standard signal, phase difference and amplitude difference are expressed as the interior correction coefficient of passage to be measured with plural form.
1f) judge whether to have surveyed all transmission channels, if store correction coefficient in all transmission channels, end operation; Otherwise, except that standard channel and surveyed in the transmission channel the passage optional one as passage to be measured, and repeating step 1b), 1c), 1d), 1e), 1f).
(2) obtain the system compensation coefficient.
2a) in N transmission channel, choose one wantonly as passage to be measured;
2b) the weights control unit is exported one group of wave beam and is formed weights to the DBF unit, and wave beam forms weights passage weights to be measured and is set to 1, and the weights of all the other N-1 passage are set to 0.
2c) correction signal is input to the DBF unit, the DBF unit multiplies each other through preliminary treatment the correction signal that receives and obtains N roadbed band digital complex signal with wave beam formation weights, obtain N road intermediate frequency simulation real signal through up-conversion and give transmitter, the N road radiofrequency signal of transmitter output is launched by antenna; The DBF unit is with step 2a) in the base-band digital complex signal of selected passage to be measured give correction calculation unit as standard signal.
2d) receive the road radiofrequency signal that processing unit will receive and obtain a roadbed band digital complex signal, give correction calculation unit as measured signal through preliminary treatment.
2e) correction calculation unit is extracted the received standard signal and the characterisitic parameter of measured signal, relatively obtains the system compensation coefficient of passage to be measured.
2f) judge whether to have surveyed all transmission channels, if store all transmission channel system compensation coefficients, end operation; Otherwise, in the transmission channel of surveying the passage optional one as passage to be measured, and repeating step 2b), 2c), 2d), 2e), 2f).
(3) obtain outer correction coefficient.The weights control unit calls the system compensation coefficient and the interior correction coefficient of each transmission channel from memory cell, and the correspondence back of being divided by obtains outer correction coefficient, and stores memory cell into.
(4) judge whether to need to upgrade correction coefficient.If change step (5); Otherwise, change step (7).
(5) upgrade interior correction coefficient.Adopt the method for step (1) to upgrade interior correction coefficient.
(6) update system correction coefficient.The weights control unit calls the inside and outside correction coefficient of each transmission channel from memory cell, and correspondence multiplies each other and obtains the system compensation coefficient and store memory cell into.
(7) correct transmission passage.The weights control unit is given DBF the unit with the system compensation coefficient, and the DBF unit multiplies each other the system compensation coefficient with the transmission channel data are corresponding, realizes transmitting channel correction.
(8) judge whether to stop to proofread and correct.If then finish to proofread and correct; Otherwise, change step (4).
The present invention compared with prior art has the following advantages:
(1) the present invention proofreaies and correct the transmission channel that comprises the transmitting antenna passage, has overcome the deficiency that existing method is not proofreaied and correct the transmitting antenna passage, makes the width of cloth of each passage respond unanimity more mutually, can more effectively form the wave beam of expectation.
(2) channel correcting method of the present invention makes full use of the wave beam formation weights in the emission digital beam formation technology, the output of a plurality of transmission channels of control flexibly, overcome the shortcoming that existing method must be injected into the correction signal timesharing each passage, can guarantee the consistency of correction signal characterisitic parameter in a plurality of transmission channels, make that the error correction coefficient that obtains is more accurate.
(3) the present invention is not strict with applied environment and correction signal, has the scope of application widely.
(4) channel correcting method of the present invention is according to these characteristics of each passage amplitude phase error of transmitting antenna constant substantially (promptly outer correction coefficient is for determining constant), the system compensation coefficient acquisition methods of complexity is divided into the simple interior correction of repeatability and complicated outer correction of single, a large amount of amounts of calculation of simplifying, and the use of minimizing equipment, overcome conventional method loaded down with trivial details shortcoming aspect the computing system correction coefficient.
Description of drawings
Fig. 1 is the block diagram of system of the present invention;
Fig. 2 is a synthesis unit block diagram of the present invention;
Fig. 3 is the inventive method flow chart.
Embodiment:
Be further described below in conjunction with accompanying drawing 1 and 2 pairs of channel error corrective systems of the present invention of accompanying drawing.
System of the present invention comprises transmission channel, memory cell, weights control unit, DBF unit, synthesis unit, arrow net analyzer, receives processing unit and correction calculation unit.Transmission channel comprises N transmitter channels and transmitting antenna passage, and passage number N selects according to user's needs, and choosing passage number N in the present embodiment is 16.Transmitter links to each other by coaxial cable with transmitting antenna.(Digital Signal Processor, DSP) the weights control unit of Shi Xianing links to each other with memory cell with the DBF unit by data/address bus by a slice digital signal processor.The weights control unit is realized three functions: the first, and the output of control transmission channel.The weights control unit produces one group of wave beam formation weights and gives DBF the unit, is formed the output of weights control transmission channel by wave beam; The second, calculate outer correction coefficient.Call the system compensation coefficient and the interior correction coefficient of each transmission channel from memory cell, correspondence is divided by and is obtained outer correction coefficient; The 3rd, the update system correction coefficient is also given DBF the unit.Call the inside and outside correction coefficient of each transmission channel from memory cell, correspondence multiplies each other and obtains system compensation coefficient and storage.(Field Programmable Gates Array FPGA) forms with 16 way word upconverter (DUC) by No. one high-speed AD converter (ADC), a slice field programmable gate array in the DBF unit.ADC samples to input signal; FPGA carries out the digital quadrature interpolation to the digital real signal that sampling obtains, base-band digital complex signal behind the quadrature interpolation and wave beam are formed weights multiply each other and obtain 16 roadbed band digital complex signal, and when obtaining the system compensation coefficient, the base-band digital complex signal of passage to be measured is outputed to correction calculation unit; DUC does Digital Up Convert to 16 roadbed band digital complex signal and obtains 16 road analog intermediate frequency signals.The output of DUC links to each other with transmitter by coaxial cable.
Synthesis unit among Fig. 2 is made up of No. 16 couplers and a synthesizer, coupler is coupled out 16 tunnel radiofrequency signals from transmitter channels, give arrow net analyzer as standard signal with the radiofrequency signal of standard channel, give after the radiofrequency signal of all the other 15 passages is synthesized by synthesizer and vow that the net analyzer is as measured signal.Vow that the net analyzer relatively obtains amplitude difference and the phase difference of measured signal with respect to standard signal.Receive processing unit and form,, link to each other by bus with correction calculation unit with the transmitting antenna wireless connections by reception antenna, receiver, one road ADC, a slice FPGA.The reception antenna received RF signal is given receiver; Receiver is down-converted to intermediate frequency with radiofrequency signal; ADC carries out bandpass sampling to the intermediate frequency simulation real signal of receiver output; FPGA obtains the intermediate frequency digital complex signal to ADC sampling and does quadrature interpolation, obtains the base-band digital complex signal and gives correction calculation unit.Correction calculation unit is realized by a slice DSP, will relatively obtain the system compensation coefficient and store memory cell into from DBF unit and the base-band digital that the reception processing unit obtains.Correction calculation unit links to each other by bus with memory cell.It is the FLASH chip of 256M that memory cell adopts a slice capacity, is used for storing the inside and outside correction coefficient and the system compensation coefficient that obtain.
Below in conjunction with accompanying drawing 3, the present invention is realized that 16 transmission channel method of its error calibration are described further, its concrete steps are as follows:
Correction coefficient is 1 in the passage that sets up standard as standard channel 1a) to choose one wantonly in 16 transmission channels, chooses one wantonly as passage to be measured in the transmission channel except that standard channel.
1b) DSP exports one group of wave beam and forms weights to FPGA, and the weights that wave beam forms weights standard channel and passage to be measured are set to 1, and the weights of all the other 14 passages are set to 0.
1c) correction signal is input to the DBF unit, the ADC in the DBF unit does the digital band pass sampling to the correction signal that receives, and gives FPGA realization digital quadrature interpolation with the digital medium-frequency signal that sampling obtains.FPGA forms weights with base-band digital complex signal and wave beam and multiplies each other and obtain 16 roadbed band digital complex signal, obtains 16 road intermediate frequencies simulation real signal through the DUC up-conversion and gives transmitter.
Digital quadrature interpolation implementation method is among the present invention: the digital real signal that the ADC sampling is obtained is divided into two-way, multiply each other with the mutually orthogonal digital local oscillator of two-way respectively, intermediate-freuqncy signal is down-converted to base band, and, after 1/2 extraction, obtain the base-band digital complex signal by frequency spectrum in the low pass filter taking-up base band.
1d) coupler is coupled out 16 tunnel radiofrequency signals through transmitter, the radiofrequency signal of standard channel is directly given vow the net analyzer as standard signal, and the radiofrequency signal of all the other 15 passages is given by synthesizer synthetic a tunnel and vowed that the net analyzer is as measured signal.
1e) from vowing that the net analyzer reads phase difference and the amplitude difference of measured signal with respect to standard signal, phase difference and amplitude difference are expressed as the interior correction coefficient of passage to be measured with plural form.
1f) judge whether to have surveyed all transmission channels, if store correction coefficient C in all transmission channels
In, end operation; Otherwise, except that standard channel and surveyed in the transmission channel the passage optional one as passage to be measured, and repeating step 1b), 1c), 1d), 1e), 1f).
Step 2. is obtained the system compensation coefficient.
2a) in 16 transmission channels, choose one wantonly as passage to be measured.
2b) DSP exports one group of wave beam and forms weights to FPGA, and wave beam forms weights passage weights to be measured and is set to 1, and the weights of all the other N-1 passage are set to 0.
2c) correction signal is input to the DBF unit, the ADC in the DBF unit does digital band pass sampling to the correction signal that receives, and the digital medium-frequency signal that sampling is obtained is given FPGA and realized that the digital quadrature interpolation obtains the base-band digital complex signal.Digital quadrature interpolation implementation method and step 1b) described concrete steps are identical.FPGA forms weights with base-band digital complex signal and wave beam and multiplies each other and obtain 16 the tunnel, and gives correction calculation unit as standard signal with the base-band digital complex signal of passage to be measured by data/address bus.DUC carries out up-conversion with 16 roadbed band digital complex signal, obtains 16 road intermediate frequencies simulation real signal and gives transmitter.
2d) reception antenna one tunnel radiofrequency signal that will receive is an intermediate-freuqncy signal through the receiver analog down, ADC carries out the digital band pass sampling to it and obtains a way word intermediate-freuqncy signal, obtain a roadbed band digital complex signal through the FPGA quadrature interpolation, give correction calculation unit as measured signal it.
2e) correction calculation unit is extracted the received standard signal and the characterisitic parameter of measured signal, relatively obtains the system compensation coefficient of passage to be measured.Its processing procedure is: correction calculation unit is carried out the FFT conversion to standard signal and reference signal respectively, obtains the frequency spectrum of standard signal and searches for its spectrum peak, supposes the spectrum peak p position, and corresponding amplitude is N
pFind the amplitude N ' of p position of measured signal frequency spectrum
p, then the amplitude and phase error correction coefficient of passage to be measured is N
p/ N '
p
2f) judge whether to have surveyed all transmission channels, if store all transmission channel system compensation coefficient C
Sys, end operation; Otherwise, in the transmission channel of surveying the passage optional one as passage to be measured, and repeating step 2b), 2c), 2d), 2e), 2f).
Step 3. is obtained outer correction coefficient.The weights control unit calls the system compensation coefficient and the interior correction coefficient of each transmission channel from memory cell, and the correspondence back of being divided by obtains outer correction coefficient, i.e. C
Out=C
Sys/ C
In, C wherein
OutBe outer correction coefficient, C
SysBe system compensation coefficient, C
InBe interior correction coefficient, store outer correction coefficient into memory cell.
Step 4. judges whether to need to upgrade correction coefficient.If change step 5; Otherwise, change step 7.
Step 5. adopts the method for step 1 to upgrade interior correction coefficient, the interior correction coefficient C ' that obtains upgrading
In
Step 6. update system correction coefficient.The weights control unit calls the inside and outside correction coefficient of each transmission channel from memory cell, and correspondence multiplies each other and obtains system compensation coefficient, i.e. C '
Sys=C '
InC
Out, and the system compensation coefficient storage of upgrading is to memory cell.
Step 7. correct transmission passage.The weights control unit is with system compensation coefficient C '
SysGive DBF the unit, the DBF unit multiplies each other the system compensation coefficient with the transmission channel data are corresponding, realizes transmitting channel correction.
Step 8. judges whether to stop to proofread and correct.If then finish to proofread and correct; Otherwise, change step 4.
Claims (6)
1. channel correcting system that is used to launch digital beam formation technology, comprise transmission channel, receive processing unit, correction calculation unit, memory cell, it is characterized in that: described transmission channel comprises a plurality of transmitters and transmitting antenna passage, the weights control unit links to each other with the DBF unit by bus, the DBF unit links to each other with transmitter by coaxial cable, the output of transmitter links to each other with transmitting antenna by coaxial cable, the synthesis unit input links to each other with transmitter by coupler, output links to each other with vowing the net analyzer by coaxial cable, the output of described reception processing unit links to each other with correction calculation unit by bus, and described memory cell links to each other with the weights control unit with correction calculation unit by bus.
2. a kind of channel correcting system that is used to launch digital beam formation technology according to claim 1 is characterized in that described transmission channel comprises N passage, chooses one of them wantonly as standard channel.
3. a kind of channel correcting system that is used to launch digital beam formation technology according to claim 1, it is characterized in that, described synthesis unit is made up of N road coupler and a synthesizer, coupler links to each other with transmitter channels, the coupler output of standard channel correspondence links to each other with vowing the net analyzer by coaxial cable, the coupler output of all the other N-1 passage correspondences links to each other with synthesizer by coaxial cable, and the output of synthesizer links to each other with vowing the net analyzer by coaxial cable.
4. a channel correcting method that is used to launch digital beam formation technology is characterized in that, and is as follows to the step of N transmission channel realization amplitude and phase error correction in the emission digital beam formation technology:
(1) obtain in correction coefficient and store memory cell into;
(2) obtain system compensation coefficient and store memory cell into;
(3) obtain outer correction coefficient: the weights control unit calls the system compensation coefficient and the interior correction coefficient of each transmission channel from memory cell, and the correspondence back of being divided by obtains outer correction coefficient, and stores memory cell into;
(4) judge whether to need to upgrade correction coefficient, if change step (5); Otherwise, change step (7);
(5) adopt the method for step (1) to upgrade interior correction coefficient;
(6) update system correction coefficient: the weights control unit calls the inside and outside correction coefficient of each transmission channel from memory cell, and correspondence multiplies each other and obtains the system compensation coefficient and store memory cell into;
(7) correct transmission passage: the weights control unit is given DBF the unit with the system compensation coefficient, and the DBF unit multiplies each other the system compensation coefficient with the transmission channel data are corresponding, realizes transmitting channel correction;
(8) judge whether to stop to proofread and correct, if then finish to proofread and correct; Otherwise, change step (4).
5. a kind of channel correcting method that is used to launch digital beam formation technology according to claim 4 is characterized in that, the concrete steps of described step (1) are as follows:
1a) set up standard that correction coefficient is 1 in the passage, in the transmission channel of the N-1 except that standard channel, choose one wantonly as passage to be measured;
1b) the weights control unit is exported one group of wave beam and is formed weights to the DBF unit, and the weights that wave beam forms weights standard channel and passage to be measured are set to 1, and the weights of all the other N-2 passage are set to 0;
1c) correction signal is input to the DBF unit, the DBF unit forms weights with the correction signal that receives through preliminary treatment and wave beam and multiplies each other and obtain N roadbed band digital complex signal, obtains N road intermediate frequency through up-conversion and simulates real signal and give transmitter;
1d) synthesis unit is coupled out N road radiofrequency signal through transmitter, the radiofrequency signal of standard channel is directly given vow the net analyzer as standard signal, and the radiofrequency signal of all the other N-1 passage synthetic a tunnel is given and vowed that the net analyzer is as measured signal;
1e) from vowing that the net analyzer reads phase difference and the amplitude difference of measured signal with respect to standard signal, phase difference and amplitude difference are expressed as the interior correction coefficient of passage to be measured with plural form;
1f) judge whether to have surveyed all transmission channels, if store correction coefficient in all transmission channels, end operation; Otherwise, except that standard channel and surveyed in the transmission channel the passage optional one as passage to be measured, and repeating step 1b), 1c), 1d), 1e), 1f).
6. according to the described a kind of channel correcting method that is used to launch digital beam formation technology of claim 4, it is characterized in that the concrete steps of described step (2) are as follows:
2a) in N transmission channel, choose one wantonly as passage to be measured;
2b) the weights control unit is exported one group of wave beam and is formed weights to the DBF unit, and wave beam forms weights passage weights to be measured and is set to 1, and the weights of all the other N-1 passage are set to 0;
2c) correction signal is input to the DBF unit, the DBF unit multiplies each other through preliminary treatment the correction signal that receives and obtains N roadbed band digital complex signal with wave beam formation weights, obtain N road intermediate frequency simulation real signal through up-conversion and give transmitter, the N road radiofrequency signal of transmitter output is launched by antenna, and the DBF unit is with step 2a) in the base-band digital complex signal of selected passage to be measured give correction calculation unit as standard signal;
2d) receive the road radiofrequency signal that processing unit will receive and obtain a roadbed band digital complex signal, give correction calculation unit as measured signal through preliminary treatment;
2e) correction calculation unit is extracted the received standard signal and the characterisitic parameter of measured signal, relatively obtains the system compensation coefficient of passage to be measured;
2f) judge whether to have surveyed all transmission channels, if store all transmission channel system compensation coefficients, end operation; Otherwise, in the transmission channel of surveying the passage optional one as passage to be measured, and repeating step 2b), 2c), 2d), 2e), 2f).
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| CN102413082A (en) * | 2011-07-29 | 2012-04-11 | 西安空间无线电技术研究所 | Amplitude-phase error calibration method and calibration system for satellite-borne DBF (direct guided wave) transmitting channel |
| WO2014190946A1 (en) * | 2013-05-31 | 2014-12-04 | 华为技术有限公司 | Joint channel correction method and device |
| CN107579784A (en) * | 2017-09-11 | 2018-01-12 | 湖南中森通信科技有限公司 | A kind of method and apparatus of the broadband amplitude and phase correction of multichannel |
| CN108988965A (en) * | 2018-08-22 | 2018-12-11 | 西安空间无线电技术研究所 | A kind of in-orbit correction system and method for novel array antenna |
| CN111157964A (en) * | 2019-12-30 | 2020-05-15 | 西安电子科技大学 | Robust broadband frequency domain channel correction method based on singular value decomposition |
| CN111416649A (en) * | 2020-05-22 | 2020-07-14 | 西安电子科技大学 | Digital beam forming method based on zero intermediate frequency architecture |
| CN114070429A (en) * | 2021-10-28 | 2022-02-18 | 中国电子科技集团公司第二十九研究所 | Method for combining radio frequency internal and external correction and computer storage medium |
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| CN111416649A (en) * | 2020-05-22 | 2020-07-14 | 西安电子科技大学 | Digital beam forming method based on zero intermediate frequency architecture |
| CN114070429A (en) * | 2021-10-28 | 2022-02-18 | 中国电子科技集团公司第二十九研究所 | Method for combining radio frequency internal and external correction and computer storage medium |
| CN114070429B (en) * | 2021-10-28 | 2023-04-18 | 中国电子科技集团公司第二十九研究所 | Method for combining radio frequency internal and external correction and computer storage medium |
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Application publication date: 20110727 |