CN106556832A - A kind of distributed digital interference system based on synthetic aperture radiometer - Google Patents
A kind of distributed digital interference system based on synthetic aperture radiometer Download PDFInfo
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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
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Abstract
The invention provides a kind of distributed digital interference system based on synthetic aperture radiometer, including：Backbone module is converged in module and numeral distribution between several submatrix modules, several battle arrays；All passages in receiver for radiometer are distributed to each submatrix module by the quantity of setting by described distributed digital interference system, data in its allocated each passage of described submatrix module digital collection, and complete the data cross-correlation calculation between data auto-correlation and passage in passage；Described numeral distribution is converged backbone module and the digital signal gathered by the submatrix module of combination of two is distributed to module between each battle array, and receives the data correlation calculation result of module between submatrix module and battle array；Between described battle array, module completes the data cross-correlation calculation of the passage two-by-two between submatrix module.Originally huge interference correlation computations are split into in multigroup submatrix correlation computations between related and battle array using said system, so as to this invention simplifies system design, optimizes system structure.
Description
Technical field
The present invention relates to synthetic aperture radiometer field, and in particular to a kind of distributed number based on synthetic aperture radiometer
Word interference system.
Background technology
Microwave remote sensing is to receive geographical various atural object transmittings or the microwave signal for reflecting using certain sensor, recognize,
Analysis object, extracts the information needed for object.Microwave remote sensing starting is later than visible ray and infrared remote sensing, relative to visible ray
For infrared remote sensor, microwave equipment can the work of round-the-clock, round-the-clock.It is and visual remote sensing can only work by day, infrared
Though remote sensing can not penetrate cloud and mist in night operation.Microwave radiometer is a passive type microwave remote sensing equipment, microwave radiation
Meter is mainly used in the monitoring of Small and Medium Sized weather phenomenon, such as storm, lightning, heavy showers, mist, frost and boundary region turbulent flow.For
The Small and Medium Sized weather disaster for generating in short time or dissipating, although simply zonal, but partial event hazardness is larger.
At present in Study of Meso Scale Weather phenomenon monitoring process, sounding balloon and weather radar are conventional means.
The measured signal of microwave radiometer is incoherent noise, it is impossible to using the imaging mechanism of active SAR therefore traditional
The spatial resolution of single antenna total power microwave radiometer is totally dependent on the physics bore of reception antenna：Metric wave, decimetric wave,
Even superhigh frequency band, is to realize that the physical pore size of the antenna required for higher spatial resolution is larger；In geostationary orbit
On, due to apart from earth 36000Km, even millimeter wave radiometer is also required to very macropore to reach high spatial resolution
The antenna in footpath.However, the big then weight of antenna size is also big, so as to cause AEROSPACE APPLICATION high cost, technical difficulty is too big, Er Qiegeng
Serious problem is that wide aperture antenna is difficult or even cannot realize mechanical scanning imaging.
Synthetic aperture radiometer adopts interference type image-forming technology, and which is that the spatial resolution bottleneck for breaking through microwave radiometer is carried
Effective technological means are supplied.Interference formula synthetic aperture imaging Technology origin in radio astronomy field, 50～60 years 20th century
In generation, astronomers, are applied to the angular resolution for improving radio astronomical telescope first, achieve good effect.From 20
The eighties in century, the concept of synthetic aperture are introduced in remote sensing fields, are applied to earth observation.Its basic thought is to adopt
Replace direct measurement of the conventional radiation meter to spatial domain with the measurement of spatial frequency domain.It is exactly specifically using with different bases
The interferometer in line length and direction carries out the sampling of spatial frequency domain, then obtains spatial image through Fourier transformation again.By
Element antenna in interferometer can be shared multiple and element antenna aperture very little by different baselines, therefore original larger
Antenna physical aperture just can by it is sparse than greatly, the junior unit aerial array that spreads replace, while without the need for mechanical scanning, just
In spaceborne realization.
Interference treatment system is the core of whole synthetic aperture radiometer system, mainly responsible digital correlation algorithm, integration
Scheduling algorithm process.The correlation reception system of early stage, due to the mlultiplying circuit for not having satisfaction, people are by from two element antennas
After signal is added and is amplified, related operation is completed using square-law detector, accordingly used at cross-correlation concentration
Reason system；Then, due to the development of mlultiplying circuit, processing structure system respectively is developed into again；These are all simulation related systems.
In the sixties, people have started the research of digital correlation treatment technology again, have had different digital correlations to process so far
Scheme is used for different occasions, and the super large array telescope that such as Napier et al. is developed is employed at the digital correlation of 3 level
Reason scheme；The Miyun synthesis radio telescope that Beijing Observatory is developed is using 2b its digital correlation processing schemes etc..From employing
Interference treatment system from the point of view of, in addition to the C-band synthetic aperture radiometer of early stage ESTAR system and space center, other
System employs digital interference technology.It is the trend of the times of synthetic aperture radiometer system from simulation-to-digital development.
The intermediate-freuqncy signal that receiver is exported is converted into by interference formula digital processing system first with analog-digital converter (ADC)
Digital signal.In order to make full use of the bandwidth of signal, higher sensitivity is obtained, the sample frequency of ADC needs to meet Nyquist
Twice of the sample frequency of Sampling Theorem, i.e. ADC for intermediate-freuqncy signal bandwidth.Digital signal can be obtained through multiply-accumulate computing
Correlation.With the development of large scale integrated circuit, digital correlation process can be carried out with ultra large scale FPGA chip, using list
Chip realizes multichannel relevant treatment two-by-two, can efficiently reduce volume, quality and the power consumption of interference system.
Existing digitalized intervention system is designed using integrated form and algorithm, is sampled comprising multi-channel digital and large scale digital
Relevant treatment.After the signal for collecting n passage, correlation is done between any two to all channel signals digital correlation unit is complete
Calculate, but related algorithm does not further split.The processing mode of this centralization causes digital back-end system extremely huge, from
And the difficulty of system design is increased, and as increasing for port number is even more presented being incremented by for the order of magnitude.Meanwhile, now with sight
Survey the needs of precision and cause the changes in distribution of aerial array, under certain conditions, each receiver unit spacing is larger, now
Digital sample can bring the long problem in high speed analog signal path with the centralized processing mode of digital correlation.For this purpose, being badly in need of
Digitalized intervention system can be split into multiple subsystems by one kind to be researched and developed, and realize modularity, to simplify digital back-end structure
Design.
The content of the invention
It is an object of the present invention to cause the fortune of system in order to solve existing digitalized intervention system using integrated form design
Complexity height, the technical problem of huge structure are calculated, the invention provides a kind of distributed digital based on synthetic aperture radiometer
Interference system, it is digital correlation is unit-modularized using the system, each module flexible distributed in system structure, to be distributed reality
The interference related operation of each passage in existing receiver for radiometer.When adding passage on existed system, it is only necessary to increase respective mode
Block, without the need for system redesign.This invention simplifies system design, optimizes system structure and distribution, to aperture synthesis spoke
The flexible expansion for penetrating multichannel large scale digital interference system in meter provides approach.
For achieving the above object, a kind of distributed digital based on synthetic aperture radiometer that the present invention is provided interferes system
System, including：Backbone module is converged in module and numeral distribution between several submatrix modules, several battle arrays；Described distributed digital
All passages in receiver for radiometer are distributed to each submatrix module, described submatrix module by the quantity of setting by interference system
Data in its allocated each passage of digital collection, and the data completed between data auto-correlation and passage in passage are mutual
Close and calculate；Described numeral distribution is converged backbone module and distributes to respectively the digital signal gathered by the submatrix module of combination of two
Module between battle array, and receive the data correlation calculation result of module between submatrix module and battle array；Between described battle array, module completes submatrix mould
The data cross-correlation calculation of the passage two-by-two between block.
Used as the further improvement of above-mentioned technical proposal, described submatrix module includes：A/D converter and interference correlometer
Calculate module；Described A/D converter is acquired and is quantified to the analogue signal in passage, by the digital signal of acquisition export to
Correlation computations module, described interference correlation computations module is interfered to be changed to A/D by several interference correlation units for arranging
The digital signal that device is exported carries out correlation computations, and quantization digital signal is sent to numeral distribution convergence with correlation calculation result
Backbone module；Described numeral distribution convergence backbone module will quantify digital signal and correlation calculation result is forwarded to mould between battle array
Block.
Used as the further improvement of above-mentioned technical proposal, backbone module is converged in described numeral distribution to be included：Several
Emitter, several distributors and several receptors；The input and outfan of each emitter connects and a pair of one respectively
The submatrix module outfan answered and distributor input, for the sampled data of submatrix module is launched to distributor with single channel；
The data multiplex of corresponding emitter is fanned out to each receptor by described distributor；The input of each receptor and two
The outfan connection of individual distributor, the input connection of module between the outfan of each receptor and its one-to-one battle array.
Used as the further improvement of above-mentioned technical proposal, described numeral distribution is converged backbone module and is passed using parallel data
Defeated mode or serial data transmission mode.
Used as the further improvement of above-mentioned technical proposal, between described battle array, module converges backbone module by numeral distribution and connects
After receiving the digital signal of A/D converter output, it is multichannel data that serioparallel exchange is carried out to digital signal, and some by what is arranged
Individual interference correlation unit carries out correlation computations to multichannel data.
Used as the further improvement of above-mentioned technical proposal, described A/D converter carries out serioparallel exchange to digital signal and is
Multiple-channel output is to interference correlation computations module；Described interference correlation computations module carries out second quantization and secondary to digital signal
Send after serioparallel exchange process to numeral distribution and converge backbone module, while after processing to second quantization and secondary serioparallel exchange
Digital signal carries out correlation computations, and correlation calculation result is sent to numeral distribution convergence backbone module.
Used as the further improvement of above-mentioned technical proposal, described A/D converter realizes data using EV8AQ160 chips
Collection, quantization and serioparallel exchange, sample rate is 5Gb/s, and quantization digit is 8bit, and serioparallel exchange is 1：8demux；Output clock
Select DDR, clock rate for sample rate 1/16th.
Used as the further improvement of above-mentioned technical proposal, described interference correlation computations module adopts Kirtex7 chip realities
Existing second quantization and secondary serioparallel exchange, quantization digit is 1bit, and serioparallel exchange is 1：2demux.
Used as the further improvement of above-mentioned technical proposal, described interference correlation computations module adopts Virtex6 chip realities
The correlation computations of existing digital signal.
Used as the further improvement of above-mentioned technical proposal, between described battle array, module realizes numeral letter using Virtex6 chips
Number serioparallel exchange and correlation computations.
The present invention a kind of distributed digital interference system advantage based on synthetic aperture radiometer be：
The present invention is by the digital correlation unit hardware modularity in digitalized intervention system, and each module being capable of flexible distributed
In system structure.On existed system, addition passage does interference and only needs to increase corresponding module, it is to avoid the setting again of system
Meter.Originally huge interference correlation computations are split in multigroup submatrix between related and battle array using the distributed digital interference system
Correlation computations, so as to this invention simplifies system design, optimizes system structure, to multichannel large scale digital interference system
Flexibly expand there is provided effective way.
Description of the drawings
Fig. 1 is that a kind of distributed digital interference system global design structure based on synthetic aperture radiometer of the present invention is shown
It is intended to.
Fig. 2 is the related distribution schematic diagram in related algorithm related between battle array of submatrix of the present invention.
Fig. 3 is that backbone module structural representation is converged in the numeral distribution in the embodiment of the present invention.
Electrical block diagrams of the Fig. 4 for the submatrix module in the embodiment of the present invention.
Fig. 5 is the optical fiber distribution line construction schematic diagram in the embodiment of the present invention.
Electrical block diagrams of the Fig. 6 for module between the battle array in the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples to a kind of distributed digital based on synthetic aperture radiometer of the present invention
Interference system is described in detail.
Synthetic aperture radiometer adopts interference type image-forming technology, so-called interference type image-forming technology to need to complete in receiver
The correlation of two passages is selected in all passages arbitrarily.For this purpose, the present invention be large scale digital related operation is decomposed it is multiple
Distribution in correlation module is calculated, and correlation module is divided to two kinds：Module between submatrix module and battle array.
As shown in figure 1, a kind of distributed digital interference system based on synthetic aperture radiometer that the present invention is provided, bag
Include：Backbone module is converged in module and numeral distribution between several submatrix modules, several battle arrays；Described distributed digital interferes system
Being united and all passages in receiver for radiometer each submatrix module are distributed to by the quantity of setting, submatrix module completes institute in array
The data digital sampling of each passage of distribution, and complete to set the data auto-correlation and data cross-correlation calculation in passage, it is described
Numeral distribution converge backbone module the digital signal gathered by the submatrix module of combination of two is distributed to into module between each battle array, battle array
Between module complete the data cross-correlation calculation of the passage two-by-two between submatrix module.Because submatrix module is only need to be performed in submatrix
The data sampling and correlation computations of each passage, the submatrix module scale are less, directly can be placed on one with receiver in structure
Rise, the outfan of receiver directly docked with the digital collection end of submatrix module, the data after digital quantization is transmitted backward,
Avoid the drawbacks of transmission analogue signal is brought over long distances.If necessary to increase port number on the basis of original system, then directly
Increase module between submatrix module and a number of battle array, it is not necessary to do again system design, allow existing module after
It is continuous to continue to use.
Specifically, distributed digital interference system of the invention is will to need to interfere related all passages to split into n
Group, per group contains m passage.Every group of passage is divided to a sub- array module, forms n sub- array module altogether.Each submatrix module is complete
Into the data sampling of m passage, and complete interchannel data cross-correlation and the data auto-correlation in passage.Module between each battle array
Complete the data cross-correlation calculation between any two submatrix module channels.Between battle array, module is corresponding with the quantity of submatrix module, isIt is individual.The overall data transmission of the data interaction of module and system between submatrix module and battle array, needs numeral distribution convergence maincenter
Module is completed.Numeral distribution is converged backbone module and is responsible for the data distribution after submatrix module samples to module between corresponding battle array,
And while receive the data correlation calculation result of module between submatrix module and battle array.
Using the theoretical basiss of the new algorithm of the above-mentioned distributed digital interference system execution of the present invention it is：Total correlation is torn open
It is divided into two kinds and interferes related sum, description of the conversion process with reference to following formula.It it is whole n × m logical on the formula equal sign left side
Data autocorrelation in data cross-correlation number and passage between road, on the right of equal sign, Section 1 is represented with n sub- array module, per height
Array module completes m interchannel data cross-correlation numberAnd data autocorrelation is in passageSecond on the right of equal sign
InThe number of combinations of optional two sub- array modules is represented, after the matching of passage two-by-two between two optional sub- array modules
To all of data cross-correlation number it isOn the right of equal sign, whole Section 2 represents the data completed between all submatrix modules
Cross-correlation number summation, while needingIndividual interference correlation unit.Thus mathematically demonstrate distributed algorithm can
Row.
As shown in Fig. 2 which illustrates the related position and proportion in the algorithm related between battle array of submatrix.Be applied to but
The 4m passage illustrated in being not limited only to figure, more passages are the expansions to this figure.Passage point is in Fig. 2 horizontally and vertically
Cloth axis, transverse axis represent an interference correlation unit with the cross point of the longitudinal axis.White portion represents that submatrix is related, black bars table
Show related between battle array, thus figure understands that the correlation computations amount that module undertakes between each gust is about each submatrix module correlation computations amount
Twice, when 4 sub- array modules are arranged, need simultaneously to arrange module between 6 battle arrays, to meet the calculating illustrated in figure distribution knot
Really.
In addition, it is the key for realizing correlation distribution thought that backbone module is converged in the numeral distribution of system, data are completed by son
Distribution of the array module to module between battle array.Mainly there are two kinds of data distribution modes, one kind is high speed serialization distribution, and another kind is at a high speed
It is parallel to distribute.As shown in figure 3, numeral distribution converges backbone module by several emitters, several distributors, several receptions
Device is constituted.
The input and outfan of each emitter connects and its one-to-one submatrix module outfan and distribution respectively
The sampled data of submatrix module is launched to distributor by device input, emitter with single channel, and distributor is by corresponding transmitting
The data multiplex of device fans out to each receptor.Between each battle array, module is provided with receptor, the input of each receptor and two
The outfan connection of distributor, between the outfan of each receptor and its one-to-one battle array, the input connection of module, is used for
Receive the data from two different submatrix modules.Emitter can be integrated in submatrix module, it is also possible to independently outside.Distribution
Device can be integrated in submatrix module, it is also possible to independent in outside, used as individual devices.
Emitter, distributor, receptor can adopt serial mode, it would however also be possible to employ the mode of parallel bus.Serial side
Formula is to transmit signal using serial high-speed bus.Serial mode has various implementation methods, for example：Using optical fiber technology, can adopt
Optic module, is made up of fiber optic emitter, optical fiber distributor, fiber optic receiver；Using RapidIO technologies, the technology is a kind of
Based on the interconnection architecture of packet-switching, it is to meet following high performance embedded system demand and one kind for designing is open
Formula interconnection technique standard, RapidIO support chip to chip, plate to the communication between plate.
And the mode that line number is passed transmits signal using parallel high-speed bus, such as parallel pci bus, traditional PCI technologies
Using the parallel bus mode similar to above-mentioned memory interface, the such as pci interface of DSP has 32bits data/address bus, during highest
Clock rate degree is 66MHz.
Embodiment one：
This gives the interference system scheme of 30 passage scales, each passage has 5Gb/s sample rates.It is described
Distributed digital interference system be divided into module between 5 sub- array modules and 10 battle arrays, 6 passages of each submatrix module assignment, son
Array module completes the data auto-correlation in 6 passages and interchannel data cross-correlation calculation.Between battle array, module completes two submatrixs
Channel data cross-correlation calculation between module.
Submatrix modular structure block diagram is as shown in figure 4, because sampling rate has arrived 5Gb/s in the present embodiment, need ultrahigh speed
ADC data acquisitions.In the present embodiment, described submatrix module includes：A/D converter and interference correlation computations module；
Digital sample in submatrix module is completed using the EV8AQ160 chips of e2v.EV8AQ160 has high integration and low-power consumption special
Point.Each EV8AQ160 quantifies for 8bit, and the digital signal of acquisition is carried out serioparallel exchange for 1 after quantization：8demux, during output
Clock selects DDR, clock rate for sample rate 1/16th.Correlation computations module is interfered to connect using Kirtex7 family chips
Receive the data Jing after serioparallel exchange and data are carried out with second quantization, quantization digit is 1bit, after quantifying again, number will be input into
1 is done according to rate：2 demux, such sample rate are just greatly reduced.Limit in view of the pin of chip, a piece of Kirtex7 docking
Two panels EV8AQ160 chip.Every Kirtex7 is output as through 1：Data flow after 16 demux, speed are reduced to
312.5Mb/s, using LVDS differential levels, takes 16*2*2=64 io mouth altogether.3 Kirtex7 are by second quantization and secondary
Data output after serioparallel exchange process is converged in backbone module to numeral distribution and realizes correlation computations, and by correlation calculation result
Send to numeral distribution and converge backbone module.In the present embodiment, described interference correlation computations module adopts Virtex6 chips
Complete the data auto-correlation and interchannel data cross-correlation calculation in 6 passages.Backbone module is converged in described numeral distribution
The digital signal for interfering the output of correlation computations module is forwarded to into module between battle array.
In submatrix module, the data that Virtex6 is received under 312.5Mb/s speed cannot directly carry out correlation computations, need
To carry out the correlation computations such as cumulative that are multiplied again after reduction of speed.1 is again passed by so：After 2 demux, start common process from collection
1：32 demux, data transfer rate are reduced to 156.25Mb/s, and subsequent correlation computations have 32 groups of data parallels to carry out.6 under synchronization
Group data auto-correlation needs 6 interference correlation units, 6 groups of data cross-correlation to need 15 interference correlation units, totally 21 interference
Correlation unit.So under 32 groups of data parallel states, need to arrange 672 interference correlation units simultaneously.And each interferes phase
Close unit and consume 8 slice, need 5376 slice altogether.As Virtex6 contains more than 30000 slice, it is possible to
Above-mentioned correlation computations are completed, and preserves certain slice surpluses.So far, submatrix module completes 6 passages, and each passage is
5Gbps sample rates, the total amount of data being sent out by submatrix module are 5*6*1Gbps=30Gbps.
As shown in figure 5, in the present embodiment, data distribution converges backbone module and passes mode using fiber count, is sent out by optical fiber
Emitter HTA8533, optical fiber distributor, fiber optic receiver HTA8534 compositions.Fiber optic emitter HTA8533 is integrated in submatrix module
In, it is connected (as shown in Figure 4) with the HXT modules in Virtex6 chips, by initial data, (A/D turns fiber optic emitter HTA8533
The digital signal of parallel operation output) light distributor independent outside submatrix is delivered to by optical fiber according to serial mode.Described
Light distributor adopts light PLC shunts, this optical fiber PLC shunts to possess one point of four function, and 1 tunnel is input into the output of 4 tunnels.Separate
Multi-channel optical fibre access module between battle array two-by-two.The integrated two fiber optic receiver HTA8534 (as shown in Figure 6) of module between battle array, complete
Fiber-optic signal is received.Between battle array, the fiber optic receiver HTA8534 of module is connected with the HXT modules in Virtex6 chips, by what is obtained
Signal is sent to Virtex6.
Fiber optic emitter HTA8533 and fiber optic receiver HTA8534, typical transmission rate about 100Gbps, centre wavelength
850nm, control end CMOS are compatible, using VCSEL array, the characteristics of with small power consumption.HTA8533 is used as transmitting terminal, HTA8534
As receiving terminal.
Can be seamlessly connected to optic module with the linear speed for being up to 11.18Gbps due to matching SEL Virtex6HXT products, can
Meet the demand of this design fiber-optic transfer application.Additionally, Virtex6HXT products rely on its outstanding jitter performance
(in the case of 11.18Gbps randomized jitter be less than 500fs rms) and signal integrity, it is to avoid adjust circuit using outside, carries
The allowance supplied needed for the powerful high-speed interface of structure.
Between battle array in the Virtex6 of module, need to complete the data between each 6 passages that two sub- array modules are distributed
Interfere correlation computations.After the signal of fiber optic receiver HTA8534 transmission is received using HXT modules, using Virtex6 to letter
Number serioparallel exchange is carried out, complete 1：32 demux.Equally, in Virtex6 32 groups of data parallels carry out correlation computations.
Under synchronization, 36 interference correlation units of the related needs between two sub- array modules, so under 32 groups of data parallel states,
Need to carry out 1152 interference correlation units simultaneously.Each interferes correlation unit to consume 8 slice, needs 9216 altogether
slice.Virtex6 contains more than 30000 slice, can complete correlation computations.
It should be noted last that, above example is only to illustrate technical scheme and unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be understood by those within the art that, the technical side to the present invention
Case is modified or equivalent, and without departure from the spirit and scope of technical solution of the present invention, which all should be covered in the present invention
Right in the middle of.
Claims (10)
1. a kind of distributed digital interference system based on synthetic aperture radiometer, it is characterised in that include：Several submatrix moulds
Backbone module is converged in module and numeral distribution between block, several battle arrays；Radiometer is received by described distributed digital interference system
All passages in machine distribute to each submatrix module by the quantity of setting, its allocated each of described submatrix module digital collection
Data in passage, and complete the data cross-correlation calculation between data auto-correlation and passage in passage；Described numeral point
The digital signal gathered by the submatrix module of combination of two is distributed to into module between each battle array with backbone module is converged, and receives submatrix
The data correlation calculation result of module between module and battle array；Between described battle array, module completes the number of the passage two-by-two between submatrix module
According to cross-correlation calculation.
2. the distributed digital interference system based on synthetic aperture radiometer according to claim 1, it is characterised in that institute
The submatrix module stated includes：A/D converter and interference correlation computations module；Described A/D converter is believed to the simulation in passage
Number it is acquired and quantifies, the digital signal of acquisition is exported to interfering correlation computations module, described interference correlation computations mould
Block carries out correlation computations by several interference correlation units for arranging to the digital signal that A/D converter is exported, and will quantify
Digital signal is sent to numeral distribution with correlation calculation result and converges backbone module；Backbone module is converged in described numeral distribution will
Quantify digital signal and correlation calculation result is forwarded to module between battle array.
3. the distributed digital interference system based on synthetic aperture radiometer according to claim 1, it is characterised in that institute
Backbone module is converged in the numeral distribution stated to be included：Several emitters, several distributors and several receptors；Each transmitting
The input and outfan of device connects and its one-to-one submatrix module outfan and distributor input respectively, for by son
The sampled data of array module is launched to distributor with single channel；The data multiplex of corresponding emitter is fanned by described distributor
Go out to each receptor；The input of each receptor is connected with the outfan of two distributors, the outfan of each receptor with
The input connection of module between its one-to-one battle array.
4. the distributed digital interference system based on synthetic aperture radiometer according to claim 1, it is characterised in that institute
The numeral distribution stated converges backbone module using parallel data transmission mode or serial data transmission mode.
5. the distributed digital interference system based on synthetic aperture radiometer according to claim 2, it is characterised in that institute
After between the battle array stated, module distributes the digital signal for converging backbone module reception A/D converter output by numeral, to digital signal
It is multichannel data to carry out serioparallel exchange, and carries out correlation computations to multichannel data by several interference correlation units for arranging.
6. the distributed digital interference system based on synthetic aperture radiometer according to claim 2, it is characterised in that institute
The A/D converter stated carries out serioparallel exchange and extremely interferes correlation computations module for multiple-channel output to digital signal；Described interference phase
Close after computing module carries out second quantization and the process of secondary serioparallel exchange to digital signal and send to numeral distribution convergence maincenter mould
Block, while the digital signal after processing to second quantization and secondary serioparallel exchange carries out correlation computations, and by correlation calculation result
Send to numeral distribution and converge backbone module.
7. the distributed digital interference system based on synthetic aperture radiometer according to claim 6, it is characterised in that institute
The A/D converter stated is realized data acquisition, is quantified and serioparallel exchange using EV8AQ160 chips, and sample rate is 5Gb/s, quantization
Number is 8bit, and serioparallel exchange is 1：8demux；Output clock selecting DDR, clock rate for sample rate 1/16th.
8. the distributed digital interference system based on synthetic aperture radiometer according to claim 6, it is characterised in that institute
The interference correlation computations module stated realizes second quantization and secondary serioparallel exchange using Kirtex7 chips, and quantization digit is 1bit,
Serioparallel exchange is 1：2demux.
9. the distributed digital interference system based on synthetic aperture radiometer according to claim 6, it is characterised in that institute
The interference correlation computations module stated realizes the correlation computations of digital signal using Virtex6 chips.
10. the distributed digital interference system based on synthetic aperture radiometer according to claim 5, it is characterised in that
Between described battle array, module realizes the serioparallel exchange and correlation computations of digital signal using Virtex6 chips.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107290720A (en) * | 2017-06-21 | 2017-10-24 | 中国科学院国家空间科学中心 | A kind of detection method of the moving spot targets based on passive microwave interference imaging |
| CN107290720B (en) * | 2017-06-21 | 2019-12-17 | 中国科学院国家空间科学中心 | method for detecting moving point target based on passive microwave interference imaging |
| CN111339484A (en) * | 2020-02-20 | 2020-06-26 | 中国科学院自动化研究所 | Method and device for realizing large radio interference array correlator based on FPGA |
| CN111339484B (en) * | 2020-02-20 | 2022-07-01 | 中国科学院自动化研究所 | FPGA-based large-scale radio interference array correlator realization method and device |
| CN111505637A (en) * | 2020-04-29 | 2020-08-07 | 中国科学院国家空间科学中心 | Self-calibration near field imaging method and system based on two-unit scanning interferometer |
| CN111505637B (en) * | 2020-04-29 | 2022-03-08 | 中国科学院国家空间科学中心 | Self-calibration near field imaging method and system based on two-unit scanning interferometer |
| CN112596036A (en) * | 2020-09-25 | 2021-04-02 | 南京信息工程大学 | Diagnosis method of MIMO radar array under impulsive noise |
| CN112596036B (en) * | 2020-09-25 | 2023-09-22 | 南京信息工程大学 | Diagnosis method of MIMO radar array under impact noise |
| CN113189408A (en) * | 2021-04-30 | 2021-07-30 | 上海航天测控通信研究所 | Related matrix processing system capable of realizing super-large-scale operation through rapid expansion |
| CN113189408B (en) * | 2021-04-30 | 2023-01-20 | 上海航天测控通信研究所 | Related matrix processing system capable of realizing super-large-scale operation through rapid expansion |
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