CN110426706A - A kind of multichannel intermediate frequency data synchronization processing method and system for array image-forming - Google Patents
A kind of multichannel intermediate frequency data synchronization processing method and system for array image-forming Download PDFInfo
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- CN110426706A CN110426706A CN201910717183.1A CN201910717183A CN110426706A CN 110426706 A CN110426706 A CN 110426706A CN 201910717183 A CN201910717183 A CN 201910717183A CN 110426706 A CN110426706 A CN 110426706A
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- intermediate frequency
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- frequency data
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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
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
Abstract
Present disclose provides a kind of multichannel intermediate frequency data synchronization processing methods and system for array image-forming.Processor is connect by trigger collection line with each intermediate frequency analog input card, and intermediate frequency acquisition process board is connect with processor by bus, the interaction for multichannel intermediate frequency data.Processor receives the trigger signal sampled to intermediate frequency data, and sends trigger signal in intermediate frequency acquisition process board；Intermediate frequency acquisition process board synchronizes receive trigger signal after, carry out ADC sampling, processor carries out Fast synchronization processing to multi-channel data, compared to the acquisition of existing multichannel intermediate frequency and digital processing method, the disclosure provides a kind of multichannel intermediate frequency data synchronization processing method and system for array image-forming, realize the Phase synchronization of multichannel intermediate-freuqncy signal acquisition in array image-forming, it realizes that Flash array is imaged by the Fast synchronization digital processing of the multi-channel data to acquisition simultaneously, improves the testing efficiency of imaging.
Description
Technical field
This disclosure relates to a kind of multichannel intermediate frequency data synchronization processing method and system for array image-forming.
Background technique
Only there is provided background technical informations relevant to the disclosure for the statement of this part, it is not necessary to so constitute first skill
Art.
Traditional microwave mm-wave imaging system is mostly synthetic aperture to be formed by way of mechanical scanning, and then realize mesh
Lateral high-resolution imaging is marked, but this mechanical scanning has that sweep time is long, testing efficiency is low, is unable to satisfy fast short-term training
The demand of picture.In order to solve the problems, such as the purely mechanic sweep test low efficiency of tradition, at present mostly using the array of multiple-input multiple-output at
Image space case is successively controlled transmitting antenna by high speed electronic switch and carries out signal transmitting, and multiple receiving antennas receive target simultaneously
Echo-signal can increase substantially image taking speed in this way.Wherein, multi-channel synchronous receives and high speed data processing technology is battle array
One of key content in column imaging scheme, while array image-forming data volume is big, in order to realize array fast imaging, frequency in realization
According to Fast synchronization processing be also to realize one of the key technology of Flash array imaging.
At present in terms of multichannel intermediate frequency synchronous acquisition and digital processing, typically by guaranteeing adopting for ADC in each channel
Sample frequency fs is consistent and Phase synchronization, is simply to ensure that the equal length on physical connection for the sampled signal in each channel to protect
It is synchronous to demonstrate,prove sampling phase.If cannot achieve the Phase synchronization of multichannel intermediate frequency acquisition, will be unable to realize array image-forming.For in
In the processing of frequency evidence, big multi-method is that FPGA in different channels carries out data processing or by the data in different channels at present
Data operation processing is carried out by different channel datas in same FPGA, such treatment process has the resource aspect of FPGA
Bigger waste, and not can guarantee the Fast synchronization processing of multi-channel data, this will affect the testing efficiency of array image-forming.
Summary of the invention
The purpose of the disclosure is solution above-mentioned technical problem, provides a kind of multichannel intermediate frequency data for array image-forming
Synchronization processing method and system, realize the Phase synchronization of multichannel intermediate-freuqncy signal acquisition in array image-forming, while realizing to acquisition
The Fast synchronization digital processing of multi-channel data come realize Flash array be imaged, improve the testing efficiency of imaging.
To achieve the goals above, the disclosure adopts the following technical scheme that
The disclosure provides a kind of multichannel intermediate frequency data System of Synchronous Processing for array image-forming, including processor and more
A intermediate frequency acquisition process board；
Processor is connect by trigger collection line with each intermediate frequency analog input card,
Intermediate frequency acquisition process board is connect with processor by bus, the interaction for multichannel intermediate frequency data.
Further, 16 road ADC sampling channel of Dou You on each intermediate frequency acquisition process board, when using same sampling
Clock；
Further, the bus uses PXIe bus, realizes the interaction of data.
The disclosure provides a kind of multichannel intermediate frequency data synchronization processing method for array image-forming, includes:
The trigger signal sampled to intermediate frequency data is received, and sends trigger signal in intermediate frequency acquisition process board；
Further, the intermediate frequency acquisition process board setting periodic reference signal compensates trigger signal and adopts to different IF
The time of collection processing board；
Further, the periodic reference signal carries out period regulation by synchronous clock domains, and all intermediate frequencies are adopted
The periodic reference signal of collection processing board uses identical clock.
Intermediate frequency acquisition process board synchronizes receive trigger signal after, start to carry out ADC to the intermediate frequency data of multichannel to adopt
Sample, the Phase synchronization of each channel ADC sampling；
Further, the trigger signal reaches at corresponding intermediate frequency acquisition before the arrival of next cycle reference signal
Board is managed, when next cycle reference signal arrives, all intermediate frequency acquisition process boards will all receive synchronous touching simultaneously
Signalling starts the sampling of multichannel intermediate frequency data.
The intermediate frequency data that intermediate frequency acquisition process board obtains multi-channel sampling is transferred in processor；
Processor receives multichannel intermediate frequency data and carries out Fast synchronization processing.
Further, the processor, which receives multichannel intermediate frequency data and carries out Fast synchronization processing method, includes,
Processor carries out independent digital quadrature mixing to multichannel intermediate frequency data, obtains the road I and the Q number of multichannel
According to；
The road I of multichannel and Q circuit-switched data are extracted respectively, reduce sample rate；
To extract obtain the road multichannel I and Q circuit-switched data are incorporated into same filter and carry out the synchronous of multi-channel data
Quick filter；
By the road I of filtered multichannel and Q circuit-switched data, it is output to rear level processor and is handled.
Further, the filter uses FIR filter.
Compared with prior art, the disclosure has the beneficial effect that
Compared to the acquisition of existing multichannel intermediate frequency and digital processing method, the disclosure provides a kind of for array image-forming
Multichannel intermediate frequency data synchronization processing method and system realize the Phase synchronization of multichannel intermediate-freuqncy signal acquisition in array image-forming, together
Shi Shixian realizes that Flash array is imaged to the Fast synchronization digital processing of the multi-channel data of acquisition, improves the test effect of imaging
Rate.
Detailed description of the invention
The Figure of description for constituting a part of this disclosure is used to provide further understanding of the disclosure, and the disclosure is shown
Meaning property embodiment and its explanation do not constitute the improper restriction to the disclosure for explaining the disclosure.
Fig. 1 is the intermediate frequency digital receiver overall construction drawing of the prior art；
Fig. 2 is the multichannel intermediate-frequency receiver structure drawing of device that the disclosure provides；
Fig. 3 is the realization multichannel intermediate-frequency receiver Phase synchronization schematic diagram that the disclosure provides；
Fig. 4 is the processor process flow diagram that the disclosure provides.
Specific embodiment:
The disclosure is described further with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the disclosure.Unless another
It indicates, all technical and scientific terms used herein has usual with disclosure person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the disclosure.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
For array imaging system, the Phase synchronization between multi-receiver channel is a very crucial problem, is determined
Can determine array imaging system realize imaging function.The Phase synchronization of multichannel collecting is for the effect of array imaging system
Can make array antenna realize synthetic aperture in along direction echo coherent and array antenna imaging after system it is non-apart from when
The phase difference prolonged is zero.
As shown in Figure 1, in the prior art, intermediate frequency digital receiver structure, multichannel intermediate-frequency receiver, which receives, comes from high frequency
The multi-channel analog intermediate-freuqncy signal of receiving unit output, intermediate frequency digital receiver hardware platform is mainly by signal distribution board and number
Frequency acquisition process board group at.
The clock signal of input, ES signal, control signal and power supply are allocated by signal distribution board, corresponding defeated
Out to the intermediate frequency acquisition process plate of rear class；
Intermediate frequency acquisition process plate mainly carries out simulated modulation, high speed acquisition, Digital Down Convert, filtering output etc. to signal.
Wherein in intermediate frequency acquisition process plate, bandpass sampling is carried out using intermediate-freuqncy signal of the high-speed ADC to simulation, then by the number of acquisition
Word intermediate frequency data is sent in FPGA, carries out the intermediate-freuqncy signal digital processing of rear class.
But in the ADC sampling process of intermediate-freuqncy signal, sample rate f s will affect the phase of sampled signal, it is ensured that more
Signal phase between channel is synchronous, need to guarantee between multichannel sampling clock with frequently and with phase, and the shake of clock
Want small.The ADC sampling in plurality of channel provides the system clock of a 200MHz to the FPGA in respective channel respectively, if not
System clock with channel cannot be guaranteed signal with the same phase of frequency, it will generates random phase, leads between each system signal not phase
Ginseng.
The collected digital intermediate frequency data in each channel are treated in journey with FPGA, if ADC is mentioned in multichannel
The 200MHz working clock frequency and phase for supplying FPGA cannot synchronize, then will be unable to guarantee in the treatment process of each channel data
The synchronization process of data need to guarantee that the local oscillator sequence in each channel keeps synchronizing, that is, guarantee secondly during carrying out down coversion
The Serial No. sequence that each channel signal is multiplied is consistent with frequency, otherwise will be generated random phase, be influenced interchannel
Coherent.
Embodiment 1
As shown in Fig. 2, the multichannel intermediate-frequency receiver device that the disclosure provides is synchronous for realizing multichannel intermediate frequency data
Processing method, including processor and multiple intermediate frequency acquisition process boards；
Processor is connect by trigger collection line with each intermediate frequency analog input card,
Intermediate frequency acquisition process board is connect with processor by bus, the interaction for multichannel intermediate frequency data.
Embodiment as one preferred, the intermediate frequency acquisition process board setting periodic reference signal compensate trigger signal
To the time of different IF acquisition process board；
It is further preferred that the periodic reference signal by synchronous clock domains carry out period regulation, and it is all in
The periodic reference signal of frequency acquisition process board uses identical clock；
It is adopted it is further preferred that the trigger signal reaches corresponding intermediate frequency before the arrival of next cycle reference signal
Collection processing board, when next cycle reference signal arrives, all intermediate frequency acquisition process boards will all receive together simultaneously
Step trigger signal starts the sampling of multichannel intermediate frequency data.
Embodiment as one preferred, 16 road ADC sampling channel of Dou You on each intermediate frequency acquisition process board, is adopted
With same sampling clock；In order to improve the resolution ratio of array image-forming, it will need to increase the channel of array antenna, so corresponding need
Increase multiple intermediate frequency acquisition process boards, all intermediate frequency acquisition process plates all use same sampling clock；
It is further preferred that the bus uses PXIe bus, the interaction of data is realized.
Embodiment 2, the disclosure provide a kind of multichannel intermediate frequency data synchronization processing method for array image-forming,
As shown in figure 3, the disclosure realizes multichannel intermediate-frequency receiver Phase synchronization schematic diagram, specific steps are as follows:
The trigger signal sampled to intermediate frequency data is received, and sends trigger signal in intermediate frequency acquisition process board；
Intermediate frequency acquisition process board synchronizes receive trigger signal after, start to carry out ADC to the intermediate frequency data of multichannel to adopt
Sample, the Phase synchronization of each channel ADC sampling；
The intermediate frequency data that intermediate frequency acquisition process board obtains multi-channel sampling is transferred in processor；
Processor receives multichannel intermediate frequency data and carries out Fast synchronization processing.
Embodiment as one preferred, as shown in figure 4, processor reception multichannel intermediate frequency data progress is quickly same
Walking processing method includes,
Processor carries out independent digital quadrature mixing to multichannel intermediate frequency data, obtains the road I and the Q number of multichannel
According to；
The road I of multichannel and Q circuit-switched data are extracted respectively, reduce sample rate；
To extract obtain the road multichannel I and Q circuit-switched data are incorporated into same filter and carry out the synchronous of multi-channel data
Quick filter；
By the road I of filtered multichannel and Q circuit-switched data, it is output to rear level processor and is handled.
It is further preferred that the filter uses FIR filter.
The above is only preferred embodiment of the present disclosure, are not limited to the disclosure, for those skilled in the art
For member, the disclosure can have various modifications and variations.It is all the disclosure spirit and principle within, it is made it is any modification,
Equivalent replacement, improvement etc., should be included within the protection scope of the disclosure.
Although above-mentioned be described in conjunction with specific embodiment of the attached drawing to the disclosure, model not is protected to the disclosure
The limitation enclosed, those skilled in the art should understand that, on the basis of the technical solution of the disclosure, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within the protection scope of the disclosure.
Claims (6)
1. a kind of multichannel intermediate frequency data synchronization processing method for array image-forming characterized by comprising
The trigger signal sampled to intermediate frequency data is received, and sends trigger signal in intermediate frequency acquisition process board；
Intermediate frequency acquisition process board synchronizes receive trigger signal after, start to carry out ADC sampling to the intermediate frequency data of multichannel, respectively
The Phase synchronization of channel ADC sampling；
The intermediate frequency data that intermediate frequency acquisition process board obtains multi-channel sampling is transferred in processor；
Processor receives multichannel intermediate frequency data and carries out Fast synchronization processing.
2. a kind of multichannel intermediate frequency data synchronization processing method for array image-forming as described in claim 1, feature exist
In,
The processor receives multichannel intermediate frequency data progress Fast synchronization processing method,
Processor carries out independent digital quadrature mixing to multichannel intermediate frequency data, obtains the road I and the Q circuit-switched data of multichannel；
The road I of multichannel and Q circuit-switched data are extracted respectively, reduce sample rate；
To extract obtain the road multichannel I and Q circuit-switched data are incorporated into same filter and carry out multi-channel data simultaneously and rapidly
Filtering；
By the road I of filtered multichannel and Q circuit-switched data, it is output to rear level processor and is handled.
3. a kind of multichannel intermediate frequency data synchronization processing method for array image-forming as described in claim 1, feature exist
In,
It further include that the intermediate frequency acquisition process board setting periodic reference signal compensates trigger signal to different IF acquisition process
The time of board.
4. a kind of multichannel intermediate frequency data synchronization processing method for array image-forming as claimed in claim 3, feature exist
In,
The periodic reference signal carries out period regulation, and the week of all intermediate frequency acquisition process boards by synchronous clock domains
Phase reference signal uses identical clock.
5. a kind of multichannel intermediate frequency data synchronization processing method for array image-forming as claimed in claim 3, feature exist
In,
The trigger signal reaches corresponding intermediate frequency acquisition process board before the arrival of next cycle reference signal, next
When a periodic reference signal arrives, all intermediate frequency acquisition process boards all will receive simultaneously synchronous triggering signal and start multi-pass
The sampling of road intermediate frequency data.
6. a kind of multichannel intermediate frequency data System of Synchronous Processing for array image-forming, which is characterized in that including processor and more
A intermediate frequency acquisition process board；
The processor is connect by trigger collection line with each intermediate frequency analog input card,
The intermediate frequency acquisition process board is connect with processor by bus, the interaction for multichannel intermediate frequency data.
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