CN106556832B - 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
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- 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 present invention provides a kind of distributed digital interference system based on synthetic aperture radiometer, comprising: module and number distribution convergence backbone module between several submatrix modules, several battle arrays；Each submatrix module is distributed to by the quantity of setting in all channels in receiver for radiometer by the distributed digital interference system, data in its each channel for being distributed of the submatrix module digital collection, and complete the data auto-correlation in channel and the data cross-correlation calculation between channel；The submatrix module digital signal collected of combination of two is distributed to module between each battle array by the described number distribution convergence backbone module, and receives the data correlation calculation result of module between submatrix module and battle array；Module completes the data cross-correlation calculation in the channel two-by-two between submatrix module between the battle array.Huge interference relevant calculation originally is split into multiple groups submatrix relevant calculation between related and battle array using above system, to optimize system structure this invention simplifies system design.
Description
Technical field
The present invention relates to synthetic aperture radiometer fields, and in particular to a kind of distributed number based on synthetic aperture radiometer
Word interference system.
Background technique
Microwave remote sensing is to receive the microwave signal of geographical various atural object transmittings or reflection using certain sensor, identification,
Object is analyzed, information needed for extracting object.Microwave remote sensing starting is later than visible light and infrared remote sensing, relative to visible light
For infrared remote sensor, microwave equipment can round-the-clock, round-the-clock work.And visual remote sensing can only work by day, it is infrared
Though remote sensing can cannot penetrate cloud and mist in night operation.Microwave radiometer is a passive type microwave remote sensing equipment, microwave radiation
Meter is mainly used for the monitoring of Small and Medium Sized weather phenomenon, such as storm, lightning, heavy rainfall, mist, frost and boundary layer turbulent flow.For
The Small and Medium Sized weather disaster for generating or dissipating in short time, although only zonal, partial event harmfulness is larger.?
At present in Study of Meso Scale Weather phenomenon monitoring process, sounding balloon and weather radar are common means.
The measured signal of microwave radiometer is incoherent noise, can not apply 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 receiving antenna: metric wave, decimetric wave,
Even superhigh frequency band, the physical pore size to realize antenna required for higher spatial resolution are 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 of diameter.However, then weight is also big greatly for antenna size, at high cost so as to cause AEROSPACE APPLICATION, technical difficulty is too big, Er Qiegeng
Serious problem is that wide aperture antenna is difficult or even cannot achieve mechanical scanning imaging.
Synthetic aperture radiometer uses interference type image-forming technology, mentions to break through the spatial resolution bottleneck of microwave radiometer
Effective technological means is supplied.Interference formula synthetic aperture imaging Technology origin was in radio astronomy field, 50~60 years 20th century
Generation, astronomers are applied to the angular resolution for improving radio astronomical telescope first, achieve good effect.From 20
The concept of the eighties in century, synthetic aperture are introduced in remote sensing fields, are applied to earth observation.Its basic thought is to adopt
Direct measurement of the conventional radiation meter to spatial domain is replaced with the measurement of spatial frequency domain.It is specifically exactly using with different bases
The interferometer in line length and direction carries out the sampling of spatial frequency domain, then obtains spatial image using Fourier transformation.By
Element antenna in interferometer can be shared multiple and element antenna aperture very little by different baselines, therefore original biggish
Antenna physical aperture can be replaced by sparse than junior unit aerial array that is great, spreading, while be not necessarily to mechanical scanning, just
In spaceborne realization.
Interference processing system is the core of entire synthetic aperture radiometer system, is mainly responsible for digital correlation algorithm, is integrated
Scheduling algorithm processing.The correlation reception system of early stage, due to the mlultiplying circuit not being satisfied with, people will be from two element antennas
Signal carry out mutually adduction amplification after, related operation is completed using square-law detector, accordingly using cross-correlation concentration at
Reason system；Then, due to the development of mlultiplying circuit, and develop as processing structure system respectively；These are all simulation related systems.
In the sixties, people have started the research of digital correlation processing technique again, have there is different digital correlation processing so far
Super large array telescope of the scheme for different occasion, such as Napier et al. to be developed uses at the digital correlation of 3 level
Reason scheme；The comprehensive radio telescope of the Miyun of Beijing Observatory development is using 2b its digital correlation processing scheme etc..From use
Interference processing system from the point of view of, it is other other than the C-band synthetic aperture radiometer of early stage ESTAR system and space center
System has been all made of digital interference technology.It is the trend of the times of synthetic aperture radiometer system from simulation-to-digital development.
Interference formula digital processing system converts the intermediate-freuqncy signal that receiver exports to 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
Sampling Theorem, the i.e. sample frequency of ADC are twice of intermediate-freuqncy signal bandwidth.Digital signal can be obtained by multiply-accumulate operation
Correlation.With the development of large scale integrated circuit, digital correlation processing can be carried out with ultra large scale FPGA chip, utilizes list
Chip realizes multichannel relevant treatment two-by-two, can efficiently reduce the volume, quality and power consumption of interference system.
Existing digitalized intervention system is designed using integrated form and algorithm, includes multi-channel digital sampling and large scale digital
Relevant treatment.After the signal for collecting n channel, correlation is done between any two to all channel signals digital correlation unit is complete
It calculates, but related algorithm is not split further.The processing mode of this centralization makes digital back-end system extremely huge, from
And the difficulty of system design is increased, and as being incremented by for the order of magnitude is even more presented in increasing for port number.Meanwhile now with sight
It surveys the needs of precision and leads to the changes in distribution of aerial array, under certain conditions, each receiver unit spacing is larger, at this time
The problem that the processing mode of digital sample and digital correlation centralization can bring high speed analog signal path too long.For this purpose, being badly in need of
Digitalized intervention system can be split into multiple subsystems by researching and developing one kind, modularization be realized, to simplify digital back-end structure
Design scheme.
Summary of the invention
It is an object of the present invention to lead to the fortune of system to solve existing digitalized intervention system using integrated form design
The technical issues of calculating high complexity, huge structure, the present invention provides a kind of distributed digitals based on synthetic aperture radiometer
Interference system, using the system that digital correlation is unit-modularized, each module flexible distributed is in system structure, to be distributed reality
The interference related operation in each channel in existing receiver for radiometer.When adding channel on existed system, it is only necessary to increase respective mode
Block, without to system redesign.This invention simplifies system designs, optimize system structure and distribution, to aperture synthesis spoke
The flexible expansion for penetrating multichannel large scale digital interference system in meter provides approach.
To achieve the above object, a kind of distributed digital based on synthetic aperture radiometer provided by the invention interferes system
System, comprising: module and number distribution convergence backbone module between several submatrix modules, several battle arrays；The distributed digital
Each submatrix module, the submatrix module are distributed to by the quantity of setting in all channels in receiver for radiometer by interference system
Data in its each channel for being distributed of digital collection, and complete the data auto-correlation in channel and the data between channel are mutual
It closes and calculates；The number distribution convergence backbone module distributes to the submatrix module digital signal collected of combination of two respectively
Module between battle array, and receive the data correlation calculation result of module between submatrix module and battle array；Module completes submatrix mould between the battle array
The data cross-correlation calculation in the channel two-by-two between block.
As a further improvement of the above technical scheme, the submatrix module includes: A/D converter and interference correlometer
Calculate module；The A/D converter is acquired and quantifies to the analog signal in channel, the digital signal that will acquire export to
Interfere relevant calculation module, the interference relevant calculation module converts A/D by several interference correlation units of setting
The digital signal of device output carries out relevant calculation, and quantization digital signal and correlation calculation result are sent to number distribution and converged
Backbone module；The number distribution convergence backbone module will quantify digital signal and correlation calculation result is forwarded to mould between battle array
Block.
As a further improvement of the above technical scheme, the number distribution convergence backbone module includes: several hairs
Emitter, several distributors and several receivers；The input terminal and output end of each transmitter are separately connected and one a pair
The submatrix module output end and distributor input terminal answered, for being emitted the sampled data of submatrix module with single channel to distributor；
The data multiplex of corresponding transmitter is fanned out to each receiver by the distributor；The input terminal of each receiver and two
The output end of a distributor connects, the input terminal connection of module between the output end of each receiver and its one-to-one battle array.
As a further improvement of the above technical scheme, the number distribution convergence backbone module is passed using parallel data
Defeated mode or serial data transmission mode.
As a further improvement of the above technical scheme, module is connect by number distribution convergence backbone module between the battle array
After the digital signal for receiving A/D converter output, carrying out serioparallel exchange to digital signal is multichannel data, and passes through the several of setting
A interference correlation unit carries out relevant calculation to multichannel data.
As a further improvement of the above technical scheme, the A/D converter is to digital signal progress serioparallel exchange
Multiple-channel output extremely interference relevant calculation module；The interference relevant calculation module carries out second quantization and secondary to digital signal
Number distribution convergence backbone module is sent to after serioparallel exchange processing, while treated to second quantization and secondary serioparallel exchange
Digital signal carries out relevant calculation, and correlation calculation result is sent to number distribution convergence backbone module.
As a further improvement of the above technical scheme, the A/D converter realizes data using EV8AQ160 chip
Acquisition, quantization and serioparallel exchange, sample rate 5Gb/s, quantization digit 8bit, serioparallel exchange 1:8demux；Export clock
DDR is selected, clock rate is 1st/16th of sample rate.
As a further improvement of the above technical scheme, the interference relevant calculation module is real using Kirtex7 chip
Existing second quantization and secondary serioparallel exchange, quantization digit 1bit, serioparallel exchange 1:2demux.
As a further improvement of the above technical scheme, the interference relevant calculation module is real using Virtex6 chip
The relevant calculation of existing digital signal.
As a further improvement of the above technical scheme, module is believed using Virtex6 chip realization number between the battle array
Number serioparallel exchange and relevant calculation.
A kind of distributed digital interference system advantage based on synthetic aperture radiometer of the invention is:
The present invention is by the digital correlation unit hardware modularization in digitalized intervention system, and each module being capable of flexible distributed
In system structure.On existed system, addition channel, which does to interfere, only to be needed to increase corresponding module, avoids setting again for system
Meter.Originally huge interference relevant calculation is split into multiple groups submatrix between related and battle array using the distributed digital interference system
Relevant calculation, so that system structure is optimized this invention simplifies system design, to multichannel large scale digital interference system
It flexibly expands and provides effective way.
Detailed description of the invention
Fig. 1 is that a kind of distributed digital interference system whole design structure based on synthetic aperture radiometer of the invention is shown
It is intended to.
Fig. 2 is the related distribution schematic diagram to related between battle array in related algorithm of submatrix of the invention.
Fig. 3 is the number distribution convergence backbone module structural schematic diagram in the embodiment of the present invention.
Fig. 4 is the electrical block diagram of the submatrix module in the embodiment of the present invention.
Fig. 5 is that the optical fiber in the embodiment of the present invention distributes line construction schematic diagram.
Fig. 6 is the electrical block diagram of 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 uses interference type image-forming technology, and so-called interference type image-forming technology needs to complete in receiver
The correlation in two channels is arbitrarily selected in all channels.For this purpose, the present invention be large scale digital related operation is decomposed it is multiple
Distribution calculates in correlation module, 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 provided by the invention, packet
It includes: module and number distribution convergence backbone module between several submatrix modules, several battle arrays；The distributed digital interferes system
Each submatrix module is distributed to by the quantity of setting in all channels in receiver for radiometer by system, and submatrix module completes institute in array
The data digital sampling in each channel of distribution, and the data auto-correlation and data cross-correlation calculation in setting channel are completed, it is described
Number distribution convergence backbone module the submatrix module digital signal collected of combination of two is distributed into module between each battle array, battle array
Between module complete submatrix module between channel two-by-two data cross-correlation calculation.Because submatrix module only needs to be performed in submatrix
The data sampling and relevant calculation in each channel, the submatrix module scale is smaller, directly can be placed on one with receiver in structure
It rising, the output end of receiver is directly docked with the digital collection end of submatrix module, the data after making digital quantization are transmitted backward,
It avoids transmitting drawback brought by analog signal over long distances.If necessary to increase port number on the basis of original system, then directly
Increase module between submatrix module and a certain number of battle arrays, do not need to do system design again, allow existing module after
It is continuous to continue to use.
Specifically, distributed digital interference system of the invention is will to need that relevant all channels is interfered to split into n
Group, every group contains m channel.Every group of channel is divided to a sub- array module, forms n sub- array modules altogether.Each submatrix module is complete
At the data sampling in m channel, and complete the data auto-correlation in the data cross-correlation and channel of interchannel.Module between each battle array
Complete the data cross-correlation calculation between any two submatrix module channels.Module is corresponding with the quantity of submatrix module between battle array, isIt is a.The overall data of the data interaction of module and system is transmitted between submatrix module and battle array, needs number distribution convergence maincenter
Module is completed.Number distribution convergence backbone module is responsible for the data distribution after submatrix module samples to module between corresponding battle array,
And the data correlation calculation result of module between submatrix module and battle array is received simultaneously.
It is using the theoretical basis that above-mentioned distributed digital interference system of the invention executes new algorithm: total correlation is torn open
Be divided into two kinds interference it is relevant and, conversion process refer to following formula description.It is whole n × m logical in formula left side of the equal sign
Data autocorrelation in data cross-correlation number and channel between road, right side of the equal sign first item are indicated with n sub- array modules, every height
Array module complete m interchannel data cross-correlation number beAnd data autocorrelation is in channelRight side of the equal sign second
InIndicate the number of combinations of optional two sub- array modules, after the matching of channel two-by-two between two optional sub- array modules
It is to all data cross-correlation numbersThe entire Section 2 of right side of the equal sign indicates to complete the data between all submatrix modules
Cross-correlation number summation, needs simultaneouslyA interference correlation unit.Thus mathematically demonstrate distributed algorithm can
Row.
As shown in Fig. 2, the related position and specific gravity to related between battle array in the algorithm of submatrix has been illustrated in it.Be applied to but
It is not limited only to 4m channel shown in figure, more channels are the expansions to this figure.It is horizontally and vertically channel point in Fig. 2
The crosspoint of cloth axis, horizontal axis and the longitudinal axis represents an interference correlation unit.White portion indicates that submatrix is related, black square table
Show related between battle array, the relevant calculation amount that thus module undertakes between each battle array known to figure is about each submatrix module relevant calculation amount
Twice, when 4 sub- array modules are arranged, need to be arranged simultaneously module between 6 battle arrays, to meet shown in figure calculating distribution knot
Fruit.
In addition, the number distribution convergence backbone module of system is the key that realize correlation distribution thought, data are completed by son
Distribution of the array module to module between battle array.There are mainly two types of data distribution modes, and one is high speed serialization distribution, another kind is high speed
Parallel distribution.As shown in figure 3, number distribution convergence backbone module is by several transmitters, several distributors, several receptions
Device composition.
The input terminal and output end of each transmitter are separately connected and its one-to-one submatrix module output end and distribution
Device input terminal, transmitter emit the sampled data of submatrix module to distributor with single channel, and distributor is by corresponding transmitting
The data multiplex of device fans out to each receiver.Module is provided with receiver between each battle array, the input terminal of each receiver and two
The output end of distributor connects, and the input terminal connection of module, is used between the output end of each receiver and its one-to-one battle array
Receive the data from two different submatrix modules.Transmitter can integrate in submatrix module, can also independently outside.Distribution
Device can integrate in submatrix module, can also be independently in outside, as individual devices.
Transmitter, distributor, receiver can use serial mode, can also be by the way of parallel bus.Serial side
Formula is to transmit signal using serial high-speed bus.There are many implementation methods for serial mode, such as: optical fiber technology is used, can be used
Optic module is made of fiber optic emitter, optical fiber distributor, fiber optic receiver；Using RapidIO technology, which is a kind of
Interconnection architecture based on packet-switching is a kind of opening for designing to meet the following high performance embedded system demand
Formula interconnection technique standard, RapidIO support chip to chip, plate to the communication between plate.
And the mode that line number passes transmits signal, such as parallel pci bus, traditional PCI technology using parallel high-speed bus
Using the parallel bus mode for being similar to above-mentioned memory interface, such as the pci interface of DSP, there is a 32bits data/address bus, when highest
Clock rate degree is 66MHz.
Embodiment one:
This gives the interference system scheme of 30 channel scales, each channel has 5Gb/s sample rate.It is described
Distributed digital interference system be divided into module between 5 sub- array modules and 10 battle arrays, 6 channels of each submatrix module assignment, son
Array module completes the data cross-correlation calculation of data auto-correlation and interchannel in 6 channels.Module completes two submatrixs between battle array
Channel data cross-correlation calculation between module.
Submatrix modular structure block diagram needs ultrahigh speed as shown in figure 4, because sampling rate has arrived 5Gb/s in the present embodiment
ADC data acquisition.In the present embodiment, the submatrix module includes: A/D converter and interference relevant calculation module；
Digital sample in submatrix module is completed using the EV8AQ160 chip of e2v.EV8AQ160 has high integration and low-power consumption special
Point.Each EV8AQ160 is 8bit quantization, and it is 1:8demux that the digital signal that will acquire after quantization, which carries out serioparallel exchange, when output
Clock selects DDR, and clock rate is 1st/16th of sample rate.Interference relevant calculation module is connect using Kirtex7 family chip
It receives the data after serioparallel exchange and second quantization is carried out to data, quantization digit 1bit will input number again after quantization
The demux of 1:2 is according to rate, such sample rate just greatly reduces.In view of the pin limitation of chip, a piece of Kirtex7 docking
Two panels EV8AQ160 chip.The output of every Kirtex7 is the data flow after the demux of 1:16, and rate is reduced to
312.5Mb/s occupies 16*2*2=64 io mouthfuls using LVDS differential level altogether.3 Kirtex7 are by second quantization and secondary
Treated that data export distributes in convergence backbone module to number and realize relevant calculation for serioparallel exchange, and by correlation calculation result
It is sent to number distribution convergence backbone module.In the present embodiment, the interference relevant calculation module uses Virtex6 chip
Complete the data cross-correlation calculation of the data auto-correlation and interchannel in 6 channels.The number distribution convergence backbone module
The digital signal of relevant calculation module output will be interfered to be forwarded to module between battle array.
In submatrix module, the data that Virtex6 is received under 312.5Mb/s rate can not directly carry out relevant calculation, need
The relevant calculations such as cumulative that are multiplied are carried out after reduction of speed again.After the demux for again passing by 1:2 in this way, process is total to since acquisition
The demux of 1:32, data transfer rate are reduced to 156.25Mb/s, and subsequent relevant calculation has 32 groups of data parallels to carry out.6 under synchronization
Group data auto-correlation needs 6 interference correlation units, and 6 groups of data cross-correlation need 15 interference correlation units, totally 21 interference
Correlation unit.So needing to be arranged simultaneously 672 interference correlation units under 32 groups of data parallel states.And each interference phase
It closes unit and consumes 8 slice, need 5376 slice altogether.Since Virtex6 contains greater than 30000 slice, it is possible to
Above-mentioned relevant calculation is completed, and saves certain slice surplus.So far, submatrix module completes 6 channels, and each channel is
5Gbps sample rate is 5*6*1Gbps=30Gbps by the total amount of data that submatrix module is sent out.
As shown in figure 5, in the present embodiment, data distribution convergence backbone module passes mode using fiber count, sent out by optical fiber
Emitter HTA8533, optical fiber distributor, fiber optic receiver HTA8534 composition.Fiber optic emitter HTA8533 is integrated in submatrix module
In, it is connect (as shown in Figure 4) with the HXT module in Virtex6 chip, by initial data, (A/D turns fiber optic emitter HTA8533
The digital signal of parallel operation output) according to serial mode the independent light distributor in submatrix outside is transmitted to by optical fiber.Described
Light distributor uses light PLC splitter, this optical fiber PLC splitter has one point of four function, and 1 tunnel inputs the output of 4 tunnels.It separates
Multi-channel optical fibre access module between battle array two-by-two.Module integrates two fiber optic receiver HTA8534 (as shown in Figure 6) between battle array, completes
Fiber-optic signal receives.The fiber optic receiver HTA8534 of module is connect with the HXT module in Virtex6 chip between battle array, by acquisition
Signal is sent to Virtex6.
Fiber optic emitter HTA8533 and fiber optic receiver HTA8534, typical transmission rate about 100Gbps, central wavelength
850nm, control terminal CMOS are compatible, using VCSEL array, have the characteristics that small power consumption.HTA8533 is as transmitting terminal, HTA8534
As receiving end.
It, can since match Sentos Virtex6HXT product can be seamlessly connected with being up to the linear speed of 11.18Gbps to optic module
Meets the needs of this design optical fiber transmission application.In addition, Virtex6HXT product relies on its outstanding jitter performance
(randomized jitter is lower than 500fs rms in the case of 11.18Gbps) and signal integrity avoid and adjust circuit using external, mention
Allowance needed for having supplied the powerful high-speed interface of building.
Between battle array in the Virtex6 of module, need to complete the data between each 6 channels that two sub- array modules are distributed
Interfere relevant calculation.After the signal for receiving fiber optic receiver HTA8534 transmitting using HXT module, using Virtex6 to letter
Number carry out serioparallel exchange, complete the demux of 1:32.Equally, 32 groups of data parallels carry out relevant calculation in Virtex6.?
Under synchronization, the correlation between two sub- array modules needs 36 interference correlation units, so under 32 groups of data parallel states,
Need to carry out 1152 interference correlation units simultaneously.Each interference correlation unit consumes 8 slice, needs 9216 altogether
slice.Virtex6 contains greater than 30000 slice, can complete relevant calculation.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, those skilled in the art should understand that, to technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (9)
1. a kind of distributed digital interference system based on synthetic aperture radiometer characterized by comprising several submatrix moulds
Module and number distribution convergence backbone module between block, several battle arrays；The distributed digital interference system receives radiometer
Each submatrix module is distributed to by the quantity of setting in all channels in machine, the submatrix module digital collection its distributed it is each
Data in channel, and complete the data auto-correlation in channel and the data cross-correlation calculation between channel；The number point
The submatrix module digital signal collected of combination of two is distributed into module between each battle array with convergence backbone module, and receives submatrix
The data correlation calculation result of module between module and battle array；Module completes the number in the channel two-by-two between submatrix module between the battle array
According to cross-correlation calculation；The submatrix module includes: A/D converter and interference relevant calculation module；The A/D converter pair
Analog signal in channel is acquired and quantifies, and the digital signal that will acquire is exported to interference relevant calculation module, described
Interference relevant calculation module carries out the digital signal that A/D converter exports by several interference correlation units of setting related
It calculates, and quantization digital signal and correlation calculation result is sent to number distribution convergence backbone module；The number distribution
Convergence backbone module will quantify digital signal and correlation calculation result is forwarded to module between battle array.
2. the distributed digital interference system according to claim 1 based on synthetic aperture radiometer, which is characterized in that institute
The number distribution convergence backbone module stated includes: several transmitters, several distributors and several receivers；Each transmitting
The input terminal and output end of device be separately connected with its one-to-one submatrix module output end and distributor input terminal, for will be sub
The sampled data of array module is emitted with single channel to distributor；The data of corresponding transmitter are sent to by the distributor
Each receiver；The input terminal of each receiver is connect with the output end of two distributors, the output end and one of each receiver
The input terminal connection of module between one corresponding battle array.
3. the distributed digital interference system according to claim 1 based on synthetic aperture radiometer, which is characterized in that institute
The number distribution convergence backbone module stated is using parallel data transmission mode or serial data transmission mode.
4. the distributed digital interference system according to claim 1 based on synthetic aperture radiometer, which is characterized in that institute
Between the battle array stated after digital signal of the module by number distribution convergence backbone module reception A/D converter output, to digital signal
Progress serioparallel exchange is multichannel data, and carries out relevant calculation to multichannel data by several interference correlation units of setting.
5. the distributed digital interference system according to claim 1 based on synthetic aperture radiometer, which is characterized in that institute
It is multiple-channel output extremely interference relevant calculation module that the A/D converter stated, which carries out serioparallel exchange to digital signal,；The interference phase
It closes after computing module carries out second quantization and the processing of secondary serioparallel exchange to digital signal and is sent to number distribution convergence maincenter mould
Block, while relevant calculation carried out to second quantization and secondary serioparallel exchange treated digital signal, and by correlation calculation result
It is sent to number distribution convergence backbone module.
6. the distributed digital interference system according to claim 5 based on synthetic aperture radiometer, which is characterized in that institute
The A/D converter stated realizes data acquisition, quantization and serioparallel exchange, sample rate 5Gb/s, quantization using EV8AQ160 chip
Number is 8bit, serioparallel exchange 1:8demux；Clock selecting DDR is exported, clock rate is 1st/16th of sample rate.
7. the distributed digital interference system according to claim 5 based on synthetic aperture radiometer, which is characterized in that institute
The interference relevant calculation module stated realizes second quantization and secondary serioparallel exchange using Kirtex7 chip, quantization digit 1bit,
Serioparallel exchange is 1:2demux.
8. the distributed digital interference system according to claim 5 based on synthetic aperture radiometer, which is characterized in that institute
The interference relevant calculation module stated realizes the relevant calculation of digital signal using Virtex6 chip.
9. the distributed digital interference system according to claim 4 based on synthetic aperture radiometer, which is characterized in that institute
Module realizes the serioparallel exchange and relevant calculation of digital signal using Virtex6 chip between the battle array stated.
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| 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 |
| 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 |
| 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 |
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