CN103685977B - A kind of device of real-time display diameter radar image - Google Patents
A kind of device of real-time display diameter radar image Download PDFInfo
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Abstract
The device that the invention provides a kind of real-time display diameter radar image includes: format conversion unit, incoming frame buffer unit, ARM communication unit, frame buffer control unit, pretreatment unit, image frame buffer unit, video data integral unit and video image display unit.Compared with traditional SAR Real-time image display device, the special Real-time image display device of a kind of synthetic aperture radar that the present invention provides need not the intervention of computer, directly the realtime image data of synthetic aperture radar is converted into video image format, shows.
Description
Technical field
The present invention relates to Digital Image Display Technology field, particularly relate to one and show synthetic aperture in real time
The device of radar image.
Background technology
SAR is a kind of active high-resolution microwave imaging radar, it is possible to round-the-clock, round-the-clock obtain
Take the Microwave scattering characteristics image of atural object.The performance of its brilliance makes it obtain on military and civilian extensively
General application, played an important role.SAR radar system has been commonly equipped with realtime imaging
Processor, it processes the echo data after digitized in real time, obtains the two dimensional image of atural object, demonstrate
Supply operator's reference.
Real-time image display device is an important component part of Real-Time Imaging System.Existing reality
Time image display device structure as shown in Figure 1.Two kinds of implementations of general employing: the first is to use
Radar image data transmission is extremely calculated by general IO card (USB card, pci card or PCI-E card)
In the internal memory of machine, then, application call DirectDraw or Window Api function realize
The conversion of picture format, and display over the display；First scheme is first to carry out radar image
Compression, reduces speed, is simultaneously converted into as synchronizing RS422 formatted data, is transferred to display terminal.
At display terminal, first realize the decompression of data, be then transferred to meter by network or other modes
Calculation machine, under the control of computer software, display is on screen.
The method and technology difficulty of above-mentioned display diameter radar image is little, it is achieved easily.But, on
The method of stating needs the intervention of computer, and power consumption, volume, weight are the biggest, particularly poor reliability,
In flight test, fault rate is high, and the convenience of use is poor.
Summary of the invention
(1) to solve the technical problem that
In view of above-mentioned technical problem, the invention provides a kind of real-time display diameter radar image
Device, in the case of getting involved without computer, to show diameter radar image in real time.
(2) technical scheme
According to an aspect of the invention, it is provided the dress of a kind of real-time display diameter radar image
Put.This shows that the device of diameter radar image includes: format conversion unit, for defeated in real time
The synthetic aperture radar realtime image data entered carries out form conversion, it is changed by differential data form
For single ended data form, and cached to incoming frame buffer unit；Frame buffer control unit, is used for
Realize following two function: (1), when image frame buffer unit is in idle condition, delays from incoming frame
Memory cell extracts diameter radar image real time data, utilizes pretreatment unit that it is carried out pre-place
Reason, and stored to image frame buffer unit；(2) from image frame buffer unit, picture number is read
According to, transmit it to video data integral unit；ARM communication unit, for by frame buffer control
Unit processed extracts parameter to be shown from the assistance data that incoming frame buffer unit is embedded, generates character
Superimposed image；Video data integral unit, for the synthetic aperture that will be obtained by image frame buffer unit
Radar image real time data and the character adding image obtained by ARM communication unit merge, and
Given video image display unit to show；Video image display unit, after being used for being combined
Video data carry out form conversion and drive after, give display and show video image in real time；Wherein,
Frame buffer control unit, pretreatment unit, incoming frame buffer unit and video data integral unit are by one
Sheet fpga chip completes.
(3) beneficial effect
From technique scheme it can be seen that compared with traditional SAR Real-time image display device,
The Real-time image display device that a kind of synthetic aperture radar of present invention offer is special need not computer
Intervention, directly the realtime image data of synthetic aperture radar is converted into video image format, enters
Row display, it has the advantage that
(1) whole display device uses industrial design standard, breaks away from the intervention of computer, connector
Few, on-keyboard, mouse, use RS422 to communicate with system master, therefore reliability is the highest；
(2) for whole display device is mainly built by FPGA and ARM minimum system, at one piece
The circuit board of standard 3U size realizes, and power consumption only has about 6W, and volume is little, low in energy consumption and weight
Gently；
(3) after the synthetic aperture radar real time imaging of Real-Time Imaging System input enters this device,
The whole process delay time processing last display through links is a display to the maximum
Refresh cycle, the display of image is almost without time delay；
(4) can the display speed of adaptive tracing radar image；Can adjust the most neatly
The gray scale of whole image, viewing area and mode of operation, be particularly suitable for airborne synthetic aperture radar and scheme in real time
As display is used.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art Real-time image display device；
Fig. 2 is the composition block diagram of embodiment of the present invention synthetic aperture radar Real-time image display device；
Fig. 3 is synthetic aperture radar realtime image data form；
Fig. 4 is the form of video standard signal；
Fig. 5 is the write of embodiment of the present invention synthetic aperture radar Real-time image display device vertical blanking interval
Schematic diagram data；
Fig. 6 is image frame buffer list in embodiment of the present invention synthetic aperture radar Real-time image display device
Unit's storage organization.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with concrete real
Execute example, and referring to the drawings, the present invention is described in more detail.It should be noted that at accompanying drawing or
During description describes, similar or identical part all uses identical figure number.Accompanying drawing does not illustrates or retouches
The implementation stated, for form known to a person of ordinary skill in the art in art.Although it addition,
The demonstration of the parameter comprising particular value can be provided herein, it is to be understood that parameter is equal to accordingly without definite
Value, but can be similar to be worth accordingly in acceptable error margin or design constraint.
The present invention proposes the device of a kind of real-time display diameter radar image, has broken away from computer
This intermediate link, based on FPGA and embedded controller, it is achieved that SAR real time imaging is direct
The function shown to display.
In one exemplary embodiment of the present invention, it is provided that one shows synthetic aperture radar in real time
The device of image.Refer to Fig. 2, the present embodiment shows the device bag of diameter radar image in real time
Include: format conversion unit, incoming frame buffer unit, ARM communication unit, frame buffer control unit,
Pretreatment unit, image frame buffer unit, video data integral unit and video image display unit.
Format conversion unit, turns for the synthetic aperture radar realtime image data of input is carried out form
Change, it is converted to single ended data form by differential data form, and is cached to incoming frame caching
Unit；
Frame buffer control unit, is used for realizing following two function: (1) is at image frame buffer unit
When idle condition, from incoming frame buffer unit, extract diameter radar image real time data, profit
With pretreatment unit, it is carried out pretreatment, and stored to image frame buffer unit；(2) from figure
As frame buffer unit reads view data, transmit it to video data integral unit；
Video data integral unit, for the synthetic aperture radar figure that will be obtained by image frame buffer unit
As real time data and the character adding image obtained by ARM communication unit merge, and sent
Show to video image display unit；
Video image display unit, after the video data after being combined carries out form conversion and drives,
Give display and show video image in real time.
ARM communication unit, for embedded from incoming frame buffer unit by frame buffer control unit
Assistance data is extracted parameter to be shown (as GPS longitude, latitude, highly, speed etc.), raw
Become character adding image, and output this to video data integral unit；
Wherein, frame buffer control unit, pretreatment unit, incoming frame buffer unit and video data are whole
Close unit to be completed by a piece of fpga chip.
Each composition portion of display diameter radar image device real-time to the present embodiment individually below
Divide and be described in detail.
Format conversion unit
In order to ensure the correctness of data transmission, the synthetic aperture radar realtime image data stream of input is
The reliability of transmission and use differential level form, in fpga chip, the data acquisition of process is used
Single-ended format, therefore, before carrying out respective handling in entering fpga chip, by completing difference
Data form is to the conversion of single ended data form.The another one benefit so processed, by FPGA core
Sheet is isolated from the outside and comes, and plays the effect of protection fpga chip.
Incoming frame buffer unit
Incoming frame buffer unit is realized by two two-port RAM structures that fpga chip is embedded.Two
Individual two-port RAM is operated in the pattern alternately stored, i.e. synchronization, and a RAM inputs number
According to, another one RAM output data, vice versa.
The moment of RAM switching depends on whether the total amount of input data reaches predetermined threshold value, as
Fruit reaches, then input RAM becomes output RAM, exports RAM and is transformed into input RAM.Door
The setting (be equal to FPGA and open up the size of ram space) of threshold value need meet two conditions:
(1) display is within the time refreshing a two field picture, and input RAM can be by the data of input
Caching gets off, and this condition ensures that the data of prime input are not lost；
(2) in fpga chip, frame buffer control unit will be able to export within the time of field blanking
The data of RAM are quickly transferred to image frame buffer unit, and this condition ensures that the image of display is complete.
Two-port RAM structure efficiently solves view data and the rear class two field picture caching of prime output
The unmatched problem of read or write speed of unit.
It is said that in general, counting of a range line image is far longer than in synthetic aperture radar real time imaging
The horizontal direction resolution of display, if to show that whole distance is to image, then be necessary for former
The range line data begun extract, if need to ensure the coherent spot of image during extraction as far as possible
Noise is few, and the method can averaged with several points replaces extraction, this see panorama method be with
Reducing image resolution ratio is cost.If being not desired to reduce the resolution of image, it is possible to as required
The required partial distance line data observed are intercepted from range line image, so can be from image
Detailed information to atural object.
The above-mentioned function seeing real time imaging panorama and details is realized by incoming frame buffer unit.Incoming frame
The mode of operation that buffer unit transmits according to ARM communication unit determines it is panorama or image is thin
Joint, if panorama, then before the real time imaging after being changed by form is deposited into input RAM,
Length according to image distance line and display horizontal width, by several for the realtime image data stream of input
Result after point is averaged once stores in input RAM, and the image of so last display is big
Range radar panoramic picture.If details, then the real time imaging range line after form is changed
Intercepting the data that part interested is adjacent, be stored in input RAM, uninterested data are thrown away.
The image of so last display is the radar image that local is interested.
ARM communication unit
ARM communication unit, reads ginseng to be shown from fpga chip in frame buffer control unit
Number (as GPS longitude, latitude, highly, speed etc.), generate character adding image, be transferred to FPGA
Video data integral unit in chip.
Additionally, ARM communication unit is also responsible for extraneous by asynchronous RS422 interface communication, and with
Frame buffer control unit in fpga chip is connected.This ARM communication unit receives extraneous mould
After formula control command and status inquiry command, order is resolved, then control parameter is transferred to
Fpga chip, uploads the state of this device simultaneously.
Finally, current mode of operation is also preserved by this ARM communication unit, once goes up upper
After electricity, from memorizer, read pattern during last system work, it is ensured that system is when power-off last time
Quarter, state worked on.
In the present embodiment, ARM communication unit is realized by ARM, and in other embodiment of the present invention
In, this ARM communication unit can also be realized by DSP, single-chip microcomputer, embedded computer etc..
Pretreatment unit
With reference to Fig. 3, give the real time imaging form of synthetic aperture radar.It is in units of frame, and one
Frame represents a range line image, and the length of every frame is generally more than 4K point, has exceeded the aobvious of screen
Show width；It addition, each point is the magnitude image of 16bits, show with conventional 8bits gray scale
Device is inconsistent.In order to radar image can be shown over the display, need the synthetic aperture thunder to input
The length and the bit wide that reach image carry out pretreatment, in order to meet display requirement.
Pretreatment unit is used for: the form of the diameter radar image real time data of input is turned by (1)
It is changed to the form required by video image display unit；(2) synthetic aperture after form conversion will be carried out
Radar image real time data completes the conversion of 16b to 8b, to adapt to the requirement of monitor resolution.
In the present embodiment, synthetic aperture radar real time imaging each pixel amplitudes value is 16bits；And regard
Frequently each point of the input data demand of image-display units is 8bits width.Want to meet display
Ask, it is necessary to the view data that range value is 16b is converted to the vedio data that range value is 8b.
So-called 16b to 8b conversion, refers to from the 8bits data that 16bits data pick-up is the most adjacent, as this
Dot image gray value.
One critical function of 16b to 8b conversion is gray scale regulation.If taking the minimum 8bits of 16bits,
The gray value of this point is minimum, if taking the highest 8bits of 16bits, then the gray value of this point is the highest.
Take which 8bits on earth, ARM communication unit the mode of operation transmitted determines.It addition, it is simple
Ground extracts 8bits from 16bits and may result in image fault, such as: the 16bits gray scale of a point
Value is 1010000011111101, if D13～D6 to be asked for, result is: 10000011.As
Fruit D14～D7 to be asked for, result is 01000001, and it is less than 10000011, this and convention phase
Being contrary to, presentation is: regulation gray value wishes that image brightens, but image is the most dimmed.
In order to solve this problem, set 16b to 8b conversion rule as: from D15～D0Middle extraction
Dn～Dn-7,
(1) eight bit data of n=15: taking-up is: D15～D8；
(2) 7≤n ＜ 15: if D15～Dn+1>=0, then, the eight bit data of taking-up is 255,
Otherwise take Dn～Dn-7；
(3) other: if D15～Dn+1>=0, then, the eight bit data of taking-up is 255, otherwise,
The height of the eight bit data taken out half part is Dn～D0, latter half is 0.
Applying this rule, gray scale regulation is the most normal.
Frame buffer control unit
Frame buffer control unit is the FPGA read-write sequence according to frame buffer unit, view data is write
Enter or read frame buffer unit.The when of image display, frame buffer control unit is responsible for data from figure
As frame buffer unit reads；During blanking, frame buffer control unit is responsible for incoming frame buffer unit
In data no write de-lay in image frame buffer unit.
Image frame buffer unit
Image frame buffer unit uses the DDR3 chip of high-speed high capacity as memorizer.Its caching one
The view data that frame is complete, during display image, it is in reading data mode；In blanking interval, it is in
Write data mode.
In fpga chip, frame buffer control unit arranges two pointers: read pointer and write pointer.Reading refers to
Pin points to the initial address of picture frame；Write pointer points to the address of the current image line refreshed；In blanking
Phase, after write N row view data, write pointer increases N；Read pointer also increases N simultaneously, it is achieved figure
The real-time rolling of picture upwards shows.If pointer has exceeded the maximum row of picture frame, then pointer turns back
To beginning, restart counting.
Wherein, high speed DDR3 can replace with storage mediums such as SRAM, SDRAM.
Video data integral unit
Video data integral unit receives the character adding image from ARM communication unit and picture frame
Buffer unit view data, completes character adding function, then gives video by final view data
Display unit, shows.
The process that realizes of character adding function is: frame buffer control unit receives format conversion unit input
Realtime image data after, therefrom extract assistance data, ARM communication unit read, and solve
Analysis assistance data, obtain need display parameter (such as: GPS longitude, latitude, highly, speed,
Roll angle, azimuth and the angle of pitch etc.), then utilize character library that these Parameters Transformation are become the ash of image
Angle value.In fpga chip frame buffer control unit from image frame buffer unit read view data time
Waiting, in fpga chip, video data integral unit synchronizes to obtain the half-tone information required for character adding,
Two data streams carry out or operate, and its result is sent to video image display unit, it is achieved thereby that image
On character adding function.
Video image display unit
Image/video display unit uses special video interface chip.It can regarding according to different systems
Frequently form selects suitable interface chip, to current S-Video interface, CVBS composite video signal
Interface, USB interface, DVI interface and HDMI can be compatible with, it is achieved radar map
As the high-quality display on different types of display.
With reference to Fig. 4, give video data integral unit in fpga chip and send video display list to
The sequential of the data stream of unit.In Fig. 4, VS represents that field sync signal, the rising edge of VS pulse represent
The image that one frame is new starts；DE represents that data enable signal, and its high level represents that the data of transmission have
Effect, low level represents data invalid, is also the blanking interval shown simultaneously；HS represents line synchronising signal,
Its rising edge represents and starts to show new data line；ODCK is that continuous print send data clock, DATA
Represent video data stream to be shown；As a example by 1024*768 display resolution, the work of above signal
It is: first a VS signal to occur, 768 HS signals occur thereafter as flow process, each
HS signal represents the data line of image；In a HS signal, the high level of DE continues 1024
The individual clock cycle, in high level, video display unit is at the trailing edge latch data of the clock of ODCK
DATA, altogether 1024 data, 1024 pixels of the most corresponding display a line.In order to
Enabling the generation video data that video display unit is correct, the video data of fpga chip is integrated single
Unit needs the sequential provided in strict accordance with Fig. 4 to transmit view data to video display unit.
Pretreatment unit is transferred to the view data of video display unit from image frame buffer unit.Figure
As the DDR3 of frame buffer unit employing high-capacity and high-speed is as memorizer, its only one of which port, with
In one moment, can only therefrom read data or write to data.Obviously, in order to ensure that image can
Correct display, between the high period of DE signal, the frame buffer control unit of fpga chip can only
Enough from image frame buffer unit reading view data, then the view data of prime input is merely able to
During between the low period of DE, (blanking interval) is written to image frame buffer unit.Blanking interval is divided into two kinds:
Row latent period and vertical blanking period, row latent period is the shortest, only several clock cycle, vertical blanking period ratio
Longer, there is multiple HS cycle.
With reference to Fig. 5, give the principle utilizing vertical blanking period write to cache view data.With
As a example by the refreshing frequency of 60Hz, a refresh cycle is 16.7ms, is wherein used for transmitting view data
Effective time be 768 row, corresponding 15.866ms；Both time differences (785us) are field blanking
Phase, the frame control unit of fpga chip must make full use of this time and be written to figure by data cached
As in frame buffer unit.Now problem it is crucial that this blanking time the most enough, with 200MHz
Clock frequency as a example by, a clock writes two points, if all used by blanking interval, then altogether
314K point can be transmitted, if image refreshing frequency is 60Hz, the PRF of synthetic aperture radar can be calculated
Frequency reaches as high as: 18.84K, and this value is (real considerably beyond actual synthetic aperture radar pulse recurrence frequency
The PRF frequency of the carried SAR on border is up to about 4KHz)；This just illustrates the time of vertical blanking period
Length is enough.
While carrier aircraft flight, synthetic aperture radar is through the real-time substrate scattering properties processing and producing
Image exports with the form of range line, and the length geometric ratio of range line is in the width of mapping band；Article two, distance
The time interval of line image depends on the flight speed of carrier aircraft, and flight speed is high, and image out is fast,
Otherwise the slowest.In view of the fixing refreshing frequency of display, within a refresh cycle, in FPGA
Range line data temporary for embedding RAM are probably and do not wait, and this depends on flight speed.Synthetic aperture
The work characteristics of radar determines the mode that radar image shows: roll upwards, the most emerging image
Occur in the latter half of indicator screen.
With reference to Fig. 6, according to the display mode of radar image, by image frame buffer unit with behavior unit
It is divided into 768 row.Two pointers are set: read pointer and write pointer.Read pointer represents that picture frame initiates
The address of a line；Write pointer represents the address of presently written row.At vertical blanking period, fpga chip
Frame control unit writes a N bar range line (range line to image frame buffer unit write pointer beginning
Corresponding a line), often write a line, write pointer adds 1, if current write pointer is 768, then next line
Data write the 1st row, write pointer are set to 1 simultaneously；After writing N bar range line data, read to refer to
Pin adds N, if result is more than 768, then deducted 768, is up-to-date read pointer.?
Next VS at first, reads data from the position that new read pointer points to, just completes figure
As scroll up and new images in real time shown in double goal.
So far, already in connection with accompanying drawing, the present embodiment has been described in detail.According to above description, this
Skilled person should the device of display diameter radar image real-time to the present invention have clear
Understanding.
Additionally, the above-mentioned definition to each element, method be not limited in embodiment is mentioned various
Concrete structure, shape or method, it can be carried out knowing ground simply by those of ordinary skill in the art
Replace.
In sum, the invention discloses the Real-time image display device that a kind of synthetic aperture radar is special,
This device is by ARM communication unit, format conversion unit, incoming frame buffer unit, pretreatment and frame
Caching control unit, image frame buffer unit, video data integral unit and video image display unit
Deng composition.This device receives the view data of real time sar imaging processor output, then
According to the feature of radar image data, under the control of ARM communication unit, data are carried out snap shot
Or intercepting, 16b to 8b conversion etc. operate, form new view data and be stored in image frame buffer；With
Time, according to the display characteristic of display, read view data from image frame buffer unit, give video
Image-display units, shows over the display after conversion.A kind of synthetic aperture that the present invention provides
It is little, low in energy consumption, lightweight, easy to use that the special Real-time image display device of radar has volume
Advantage, it is possible to high-quality display real time image picture.
Particular embodiments described above, is carried out the purpose of the present invention, technical scheme and beneficial effect
Further describe, be it should be understood that the foregoing is only the present invention specific embodiment and
, be not limited to the present invention, all within the spirit and principles in the present invention, that is done any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (12)
1. the device of a real-time display diameter radar image, it is characterised in that including: lattice
Formula converting unit, incoming frame buffer unit, ARM communication unit, frame buffer control unit, locate in advance
Reason unit, image frame buffer unit, video data integral unit and video image display unit, wherein:
Format conversion unit, turns for the synthetic aperture radar realtime image data of input is carried out form
Change, it is converted to single ended data form by differential data form, and is cached to incoming frame caching
Unit；
Frame buffer control unit, is used for realizing following two function: (1) is at image frame buffer unit
When idle condition, from incoming frame buffer unit, extract diameter radar image real time data, profit
With pretreatment unit, it is carried out pretreatment, and stored to image frame buffer unit；(2) from figure
As frame buffer unit reads view data, transmit it to video data integral unit；
ARM communication unit, for embedded from incoming frame buffer unit by frame buffer control unit
Assistance data is extracted parameter to be shown, generates character adding image；
Video data integral unit, for the synthetic aperture radar figure that will be obtained by image frame buffer unit
As real time data and the character adding image obtained by ARM communication unit merge, and sent
Show to video image display unit；
Video image display unit, after the video data after being combined carries out form conversion and drives,
Give display and show video image in real time；
Wherein, frame buffer control unit, pretreatment unit, incoming frame buffer unit and video data are whole
Close unit to be completed by a piece of fpga chip.
Device the most according to claim 1, it is characterised in that described incoming frame buffer unit
Two the two-port RAM structures embedded by described fpga chip realize；
Said two two-port RAM is operated in the pattern alternately stored, i.e. synchronization, one
RAM inputs data, another one RAM output data, and vice versa, and wherein, RAM switches
Moment depend on whether the total amount inputting data reaches predetermined threshold value, if reached, then inputs
RAM becomes output RAM, output RAM and is transformed into input RAM.
Device the most according to claim 2, it is characterised in that below described threshold value meets
Two conditions:
(1) display is within the time refreshing a two field picture, and input RAM can be by the data of input
Caching gets off, and this condition ensures that the data of prime input are not lost；
(2) in fpga chip, frame buffer control unit will be able to export within the time of field blanking
The data of RAM are quickly transferred to image frame buffer unit, and this condition ensures that the image of display is complete.
Device the most according to claim 1, it is characterised in that described ARM communication unit is used
In reading supplementary number from the assistance data that incoming frame buffer unit is embedded by frame buffer control unit
According to, resolve assistance data and obtain the parameter needing display, then utilize character library these Parameters Transformation to be become
The gray value of image.
Device the most according to claim 4, it is characterised in that in described ARM communication unit,
Parameter to be shown includes: GPS longitude, latitude, height and/or speed.
Device the most according to claim 1, it is characterised in that described pretreatment unit is used for:
(1) form of the diameter radar image real time data of input is converted to video image display single
Form required by unit；(2) complete by carrying out the diameter radar image real time data after form conversion
Become the conversion of 16b to 8b, to adapt to the requirement of monitor resolution.
Device the most according to claim 6, it is characterised in that described pretreatment unit is used for
Diameter radar image real time data after carrying out form conversion according to following rule completes 16b and arrives
The conversion of 8b, from D15～D0Middle extraction Dn～Dn-7, wherein:
(1) eight bit data of n=15: taking-up is: D15～D8；
(2) 7≤n ＜ 15: if D15～Dn+1>=0, then, the eight bit data of taking-up is 255,
Otherwise take Dn～Dn-7；
(3) other: if D15～Dn+1>=0, then, the eight bit data of taking-up is 255, otherwise,
The height of the eight bit data taken out half part is Dn～D0, latter half is 0.
Device the most according to claim 1, it is characterised in that described image frame buffer unit
Caching the view data that a frame is complete, during display image, it is in reading data mode；In blanking interval,
It is in writes data mode；
Wherein, frame buffer control unit arranges two pointers: read pointer and write pointer；Read pointer points to
The initial address of picture frame；Write pointer points to the address of the current image line refreshed；At blanking interval, write
After entering N row view data, write pointer increases N；Read pointer also increases N simultaneously, it is achieved the reality of image
Time roll upwards show, if pointer has exceeded the maximum row of picture frame, then pointer go back to beginning,
Restart counting.
Device the most according to claim 8, it is characterised in that by image frame buffer unit with
Behavior unit is divided into 768 row；
Read pointer represents that picture frame initiates the address of the 1st row；Write pointer represents the address of presently written row；
At vertical blanking period, frame control unit writes N bar range line to image frame buffer unit write pointer beginning,
Often writing 1 row, write pointer adds 1, if current write pointer is 768, then next line data write the 1st
OK, write pointer is set to 1 simultaneously；After writing N bar range line data, read pointer adds N, if
Result is more than 768, then deducted 768, is up-to-date read pointer；
In next field sync signal VS at first, read from the position that new read pointer points to
Data, just complete the double goal that image scrolls up and new images shows in real time.
Device the most according to claim 8, it is characterised in that described image frame buffer unit
Use DDR3, SRAM or SDRAM memory.
11. devices according to claim 1, it is characterised in that described video data is integrated single
Unit realizes character adding function in such a way: in frame buffer control unit from image frame buffer unit
The when of reading view data, video data integral unit synchronizes to obtain the gray scale required for character adding
Information, two data streams carry out or operate, and its result is sent to video image display unit, thus realizes
Character adding function on image.
12. according to the device according to any one of claim 1 to 11, it is characterised in that described
Video image display unit selects corresponding video interface chip, compatible S-Video interface, CVBS
Composite video signal interface, USB interface, DVI interface and HDMI.
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| CN201310411249.7A CN103685977B (en) | 2013-09-11 | 2013-09-11 | A kind of device of real-time display diameter radar image |
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| CN201310411249.7A CN103685977B (en) | 2013-09-11 | 2013-09-11 | A kind of device of real-time display diameter radar image |
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| CN103685977A CN103685977A (en) | 2014-03-26 |
| CN103685977B true CN103685977B (en) | 2016-08-24 |
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| CN107094241B (en) * | 2017-04-28 | 2019-05-24 | 北京无线电测量研究所 | A kind of the real time imagery display methods and system of carried SAR |
| CN108038830B (en) * | 2017-12-18 | 2021-05-07 | 北京理工雷科电子信息技术有限公司 | Method for SAR image geometric correction by software cache technology |
| CN110658520B (en) * | 2019-08-19 | 2021-10-29 | 中国科学院电子学研究所 | Synthetic aperture radar imaging system and method |
| CN111683213B (en) * | 2020-06-16 | 2022-08-16 | 中国北方车辆研究所 | Self-adaptive character superposition system and method based on region-of-interest gray level image |
| CN113727151A (en) * | 2021-10-19 | 2021-11-30 | 西安微电子技术研究所 | Ultra-high-definition video distributed real-time processing system, method, equipment and medium |
| CN114020380A (en) * | 2021-10-21 | 2022-02-08 | 北京电子工程总体研究所 | Radar image display device and method |
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