CN105759088A - System displaying channel state on signal generator - Google Patents
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- CN105759088A CN105759088A CN201410796348.6A CN201410796348A CN105759088A CN 105759088 A CN105759088 A CN 105759088A CN 201410796348 A CN201410796348 A CN 201410796348A CN 105759088 A CN105759088 A CN 105759088A
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Abstract
The invention discloses a system displaying channel state on a signal generator. The signal generator at least includes one signal channel and one display screen. The system includes a channel state judging module used for judging whether the signal channel is open or closed; a channel state drawing module used for drawing a channel state open state when the signal channel is open and drawing a channel state closed state when the signal channel is closed in an independent fixed display area, which is separated from other display areas, on the display screen of the signal generator, wherein the independent fixed display area is displayed in any display interface of the signal generator. According to the invention, by utilizing the independent fixed display area which is independent from other display areas and is displayed in any display interface of the signal generator for displaying the channel state open state or the channel state closed state, a user can perform channel state inquiry in real time.
Description
Technical field
The present invention relates to electric variable field tests, particularly relate to a kind of system of display channel state on signal generator.
Background technology
Signal generator, as common driving source, has been widely used scientific research and industrial engineering field.One typical case's application of signal generator is exactly simulate various signal in the lab, and as the input stimulus of circuit under test and system, the various performance indications for test circuit under test and system provide simulated environment.Traditional signal generator is divided into four big classes by its signal waveform: (1) sinusoidal signal generator: be mainly used in measuring circuit and the frequency characteristic of system, non-linear distortion, gain and sensitivity etc.；(2) function (waveform) signal generator: produce some specific periodically time function waveform (sine wave, square wave, triangular wave, sawtooth waveforms and impulse wave) signal, except being available for communication, instrument and automatic control system test, it is also widely used in other non-field of electric measurement；(3) pulse signal generator: produce the generator of width, amplitude and the adjustable rectangular pulse of repetition rate, can be used for the transient response of p-wire sexual system, or tests the performance of radar, multichannel communication multiple telecommunication and other pulse digit systems as analogue signal；(4) random signal generator: can be used for the noise simulating in actual operating conditions, introduces the stochastic signal of generation and treats examining system, thus measuring systematic function；The additional known noise Signals & Systems internal noise of system under test (SUT) can to compare to measure noise coefficient；Sinusoidal or pulse signal can also be replaced, to measure system dynamic characteristic etc. with stochastic signal.
Signal generator can be widely used in the fields such as electronics research and development, maintenance, measurement, calibration.In the use procedure of signal generator, which kind of state each passage is in, particularly being in open mode or be closed, needing be shown to user and facilitate user to check, therefore current most signal generator all has channel status display function.
With reference to Fig. 1, it is shown that the mode of a kind of signal generator display channel opening of prior art, with reference to Fig. 2, it is shown that the mode of this signal generator display channel closed mode of prior art.By Fig. 1 and Fig. 2 it can be seen that the display of these two kinds of channel statuses of signal generator only uses different characters to make a distinction, it is impossible to highlight the state that is turned on and off of passage, lacking the definition that key message shows, information shows unintelligible；And prior art is after entering into the assistant interface of signal generator, will no longer be shown channel status information, user cannot carry out the inquiry of channel status in real time, also just loses real-time.
Summary of the invention
It is an object of the invention to, what solve prior art signal generator display channel is turned on and off state, lacking the definition that key message shows, information shows technical problem that is unintelligible and that lack real-time, it is provided that a kind of system of display channel state on signal generator.
A kind of system of display channel state on signal generator, described signal generator at least includes a signalling channel and a display screen, including with lower module:
Channel status judge module, is used for judging that described signalling channel is on or off；
Channel status drafting module, for when described signalling channel is opened, one on the display screen of described signal generator independent of in the independent fixed display area of other viewing areas, draw a channel status and open mark, when described signalling channel is closed, in described independent fixed display area, drawing a channel status and close mark, described independent fixed display area is shown in arbitrary display interface of described signal generator.
The system of the present invention, utilizes the independent fixed display area independent of other viewing areas to draw channel status and opens mark or channel status closedown mark, and independent fixed display area is shown in arbitrary display interface of signal generator.Make to enter into the assistant interface of signal generator or other any interfaces, can independent display channel status information, user can carry out the inquiry of channel status in real time.
Illustrate as one, described independent fixed display area is a rectangular region, described independent fixed display area includes a graded bedding and a channel status draws layer, described graded bedding is with described rectangular bottom for string, the minor arc region formed in described rectangular region, the color of the pixel in described minor arc region is from the central point of described string, the radial direction round along described minor arc place is with linear rule gradual change, described channel status is drawn and is placed on described graded bedding, described channel status draws the colouring discrimination of layer in the color of described graded bedding, described channel status opens mark or described channel status is closed mark and is plotted on described channel status drafting layer.
Owing to the color of graded bedding of independent fixed display area is with linear rule gradual change, making graded bedding is shown or in by secretly showing to bright gradual change to dark gradual change by bright, narrow zone is created vision amplification effect, and channel status drafting is placed on graded bedding, more three-dimensional highlight channel status and open mark or channel status closes mark so that the display of channel status is prominent, clear, clearly.
Illustrating as one, draw described channel status with the color identical with current channel color and open mark, the color to be different from described current channel is drawn described channel status and is closed mark.
Drawing channel status with the color identical with current channel color and open mark, the color to be different from current channel is drawn channel status and is closed mark, it is possible to make user discover rapidly channel status, it is simple to observe.
Illustrating as one, the color of the pixel between the arc of the upper base of described rectangular region extremely described minor arc is identical with the background color of described display screen.
The upper base of rectangular region is identical with the background color of display screen to the color of the pixel between the arc of minor arc, more highlights the effect that the gradual change of graded bedding highlights.
Illustrating as one, the midpoint on the upper base of described rectangular region is the end points of a diameter of the circle at described minor arc place.
Illustrating as one, it is isosceles-trapezium-shaped that described channel status draws the shape of layer, and going to the bottom of described isosceles trapezoid overlaps with described string, and the color of the pixel within described isosceles trapezoid is identical with the background color of described display screen.
Illustrate as one, the color of two waists of described isosceles trapezoid and the pixel of upper base, it is different from the color of described graded bedding, and by two waists to upper base with linear rule gradual change.
It is isosceles trapezoid that channel status draws layer, and the color of two waists of isosceles trapezoid and the pixel of upper base is different from the color of graded bedding, and by two waists to upper base with linear rule gradual change, more highlights the third dimension of whole independent fixed display area.
Illustrating as one, in described independent fixed display area, the channel status drawing multiple signalling channel side by side opens mark or channel status closedown mark.
Illustrate as one, described channel status drafting module, it is plotted as, for described channel status unlatching mark or described channel status being closed mark according to the current system language of described signal generator, the mark represented with current system language.
Illustrate as one, also include
Path setting module, for setting the channel parameters of described signalling channel；
Status set module, for according to a coding rule, being converted to a coding maker position by described channel parameters；
Memory module, for storing described coding maker position in predetermined memory block；
Parameter acquisition module, for sequentially obtaining described coding maker position according to described predetermined memory block；
Decoding modular converter, for according to the decoding rule corresponding with described coding rule, being decoded as discernible character string by described coding maker position；
State parameter drafting module, in described independent fixed display area both sides, drawing described character string.
In independent fixed display area both sides with the form display channel parameter of character string, channel status and channel parameters are shown side by side, channel parameters also no longer disappears along with entering signal generator assistant interface so that user can become apparent from, pay close attention to the channel status of whole signal generator and all channel parameters clearly in real time.
Accompanying drawing explanation
Fig. 1 is the interface schematic diagram of a kind of signal generator display channel opening of prior art；
Fig. 2 is the interface schematic diagram of a kind of signal generator display channel closed mode of prior art；
Fig. 3 is a kind of method flow diagram of display channel state on signal generator of the present invention；
Fig. 4 is a kind of interface schematic diagram of display channel state on signal generator of the preferred embodiment of the present invention；
Fig. 5 is the interface schematic diagram of the signal generator entrance network settings assistant interface of the preferred embodiment of the present invention；
The signal generator that Fig. 6 is the preferred embodiment of the present invention enters the interface schematic diagram storing assistant interface；
Fig. 7 is preferred embodiment of the present invention partial enlarged drawing of the independent fixed display area 401 of display channel state on signal generator；
Fig. 8 is the method flow diagram that the preferred embodiment of the present invention draws graded bedding 4011；
Fig. 9 is preferred embodiment of the present invention system block diagram of display channel state on signal generator.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are further described in detail.
With reference to Fig. 3, in conjunction with reference to Fig. 4, a kind of method of display channel state on signal generator, described signal generator at least includes a signalling channel and a display screen 400, comprises the following steps:
Channel status judges step S301, it is judged that described signalling channel is on or off；
Channel status plot step S302, when described signalling channel is opened, on the display screen 400 of signal generator one is independent of in the independent fixed display area 401 of other viewing areas, draw a channel status and open mark 402, when signalling channel is closed, in independent fixed display area 401, drawing a channel status and close mark 403, independent fixed display area 401 is shown in arbitrary display interface of signal generator.
In the interface of this preferred embodiment, depicting the channel status of two signalling channels side by side, it is the mark that first passage is currently opened that channel status opens mark 402, and it is the mark that second channel is presently off that channel status closes mark 403.
As other citing, in this illustration, channel status unlatching mark or the channel status that can also only draw a passage in independent fixed display area 401 close mark.
As other citing, in this illustration, the channel status that can also draw multiple signalling channel in independent fixed display area 401 opens mark or channel status closedown mark.
With reference to Fig. 5, it is shown that the signal generator of the preferred embodiment of the present invention enters the interface schematic diagram of network settings assistant interface.With reference to Fig. 6, it is shown that be the interface schematic diagram of the signal generator entrance storage assistant interface of the preferred embodiment of the present invention.Can be seen that from two above assistant interface, independent fixed display area 401 is shown in arbitrary display interface of signal generator, no matter enter into assistant interface or other any interfaces of signal generator, can independent display channel status information, user can carry out the inquiry of channel status in real time.
With reference to Fig. 7, it is shown that the preferred embodiment of the present invention is the partial enlarged drawing of the independent fixed display area 401 of display channel state on signal generator.In the preferred embodiment, independent fixed display area 401 is a rectangular region, independent fixed display area 401 includes a graded bedding 4011 and a channel status draws layer 4012, graded bedding 4011 is with rectangular bottom for string, the minor arc region formed in rectangular region, the color of the pixel in minor arc region is from the central point of string, radial direction along minor arc place circle gradually becomes shallower as with linear rule, channel status is drawn layer 4012 and is placed on graded bedding 4011, channel status opens mark 402 and channel status is closed mark 403 and is plotted on channel status drafting layer 4012.In the preferred embodiment, the midpoint on the upper base of described rectangular region is the end points of a diameter of the circle at described minor arc place.As other citing, in this illustration, the upper base of described rectangular region and described minor arc can not have intersection point.In the preferred embodiment, it is isosceles-trapezium-shaped that channel status draws the shape of layer 4012, and going to the bottom of isosceles trapezoid overlaps with described string, and the color of the pixel within isosceles trapezoid is identical with the background color of display screen 400.In the preferred embodiment, the color of two waists of isosceles trapezoid and the pixel of upper base, relatively the color of graded bedding 4011 is deep, and is gradually become shallower as with linear rule to upper base by two waists.
With reference to Fig. 8, it is shown that the preferred embodiment of the present invention draws the method flow diagram of graded bedding 4011,
Step S801, the total pixel count iNum according to the wide and high calculating fixed display area 401 of fixed display area 401；
Step S802, starts counting up from ith pixel point, and i is initially 0；
Step S803, it is judged that whether i is less than total pixel count iNum；
When step S804, i are less than total pixel count iNum, calculate the distance Di between ith pixel point and the center of circle of minor arc；
Step S805, it is judged that the radius whether the distance Di between ith pixel point and the center of circle of minor arc is round less than or equal to minor arc place；
Step S806, when distance Di is less than or equal to the radius of minor arc place circle, according to the color of the color calculation ith pixel point of dark pixel point most on the color of brightest pixel point, minor arc on Di, minor arc；Due in the preferred embodiment, the color of the pixel in minor arc region is from the central point of string, radial direction along minor arc place circle gradually becomes shallower as with linear rule, so, the pixel that on minor arc, color is the deepest is the central point of string, the pixel that on minor arc, color is the most shallow be minor arc point on the circumference of the circle；
As other citing, in this illustration, the color of the pixel in minor arc region can also from the central point of string, radial direction along minor arc place circle deepens gradually with linear rule, so, the pixel that on minor arc, color is the most shallow is the central point of string, the pixel that on minor arc, color is the deepest be minor arc point on the circumference of the circle；
Step S807, draws ith pixel point；
Step S808, when distance Di is more than the radius of minor arc place circle, is plotted as the background color of display screen 400 by the color of ith pixel point；
As other citing, in this illustration, the upper base of rectangular region to the color of the pixel between the arc of minor arc can also be different from the background color of display screen 400, adopts other colors to draw.Simply the upper base of rectangular region to the color of the pixel between the arc of minor arc identical with the background color of display screen 400 time, best results, more highlight the effect that the gradual change of graded bedding highlights.
Step S809, pixel adds 1；
Step S810, when i is equal to total pixel count iNum, flow process terminates.
In the preferred embodiment, making two waists of isosceles trapezoid and the color of the pixel of upper base, relatively the color of graded bedding 4011 is deep, and is gradually become shallower as with linear rule by two waists to upper base and be specifically achieved in that
First, the coordinate of trapezoidal 4 end points is determined according to trapezoidal size；
Secondly the coordinate, according to described 4 end points, determine respectively the number of the pixel of trapezoidal upper base be n1, the number of the pixel of trapezoidal every waist be n2；
Then, it is color1 by the color settings of the pixel of trapezoidal upper base, the color of the pixel that the color of color1 is the most shallow compared with color on minor arc wants deep, the color settings of the pixel of trapezoidal two waist bottommosts is color2, the color of the pixel that the color of color2 is the deepest compared with color on minor arc wants deep, the color of trapezoidal two waists x-th pixel from the bottom to top is colorx, colorx=color2-(color2-color1) * x/n2.The computing of color is specifically performed in such a way that color value is to realize by the mode of coding, determine according to the figure place used in system: first a color value is formed R (red) by three parts, G (green), B (indigo plant), if system uses 24 place values to calculate color, RGB takies 8 respectively, value is from 0～255, altogether can encode the 24 power kind colors of 2, can select black is encoded to 0 (0x000000), white color-coded is 16777215 (0xFFFFFF), and other colors are between black and white；If system using 16 place values to calculate color, RGB takies 5,6,5 respectively, or 5,5,5 (highest order is invalid), still can select to be encoded to black 0 (0x0000), white color-coded is 65535 (0xFFFF), and other colors are between black and white.Realize color value by the mode of coding and belong to the implementation of prior art, no longer describe in detail here.
It is isosceles trapezoid that channel status draws layer 4012, and the color of two waists of isosceles trapezoid and the pixel of upper base is deeper than the color of graded bedding, and is gradually become shallower as with linear rule to upper base by two waists, more highlights the third dimension of whole independent fixed display area 401.
As other citing, in this illustration, the color of two waists of isosceles trapezoid and the pixel of upper base, it is possible to distinguish in the color of graded bedding, and deepened gradually with linear rule to upper base by two waists, as long as the third dimension that can strengthen independent fixed display area 401 is just passable.
In the preferred embodiment, it is draw channel status with the color identical with current channel color to open mark 402, draws channel status with gray color and close mark 403.
Draw channel status with the color identical with current channel color and open mark 402, draw channel status with the color of Lycoperdon polymorphum Vitt and close mark, it is possible to make user discover rapidly channel status, it is simple to observe.
As other citing, in this illustration, it is also possible to be different from the color of current channel color, select a kind of brightly painted color to draw channel status and open mark 402, as long as it is just passable to play the purpose highlighted.
In the preferred embodiment, according to the current system language English of described signal generator, channel status is opened mark 402 and be plotted as " ON " mark represented with current system language, channel status is closed mark 403 and is plotted as " OFF " mark represented with current system language.
As other citing, in this illustration, according to the current system language Chinese of described signal generator, channel status can also be opened mark 402 and be plotted as the "ON" mark represented with current system language, channel status be closed mark 403 and is plotted as the "Off" mark represented with current system language.
As other citing, in this illustration, it can be the arbitrary shape except isosceles trapezoid that channel status draws the shape of layer 4012.And channel status draw the color of the interior pixels point that pixel and the channel status on limit of layer 4012 draws layer 4012 all can be identical with the background color of display screen 400.
With reference to Fig. 9, in conjunction with reference to Fig. 4, the preferred embodiment of the present invention is the system of display channel state on signal generator, and described signal generator at least includes a signalling channel and a display screen 400, including with lower module:
Channel status judge module 901, it is judged that described signalling channel is on or off；
Channel status drafting module 902, when described signalling channel is opened, on the display screen 400 of signal generator one is independent of in the independent fixed display area 401 of other viewing areas, draw a channel status and open mark 402, when signalling channel is closed, in independent fixed display area 401, drawing a channel status and close mark 403, independent fixed display area 401 is shown in arbitrary display interface of signal generator.
On signal generator, the system of display channel state specifically flow chart shown in Fig. 3 performs each step.
The system of the present invention, owing to utilizing independent of drawing channel status unlatching mark 402 or channel status closedown mark 403 in the independent fixed display area 401 of other viewing areas, independent fixed display area 401 is shown in arbitrary display interface of signal generator.Make to enter into the assistant interface of signal generator or other any interfaces, can independent display channel status information, user can carry out the inquiry of channel status in real time.
With reference to Fig. 4, as other citing, in this illustration, on signal generator, the system of display channel state also includes such as lower module:
Path setting module, for setting the channel parameters of described signalling channel；
Status set module, for according to a coding rule, being converted to a coding maker position by described channel parameters；
Memory module, for storing described coding maker position in predetermined memory block；
Parameter acquisition module, for sequentially obtaining described coding maker position according to described predetermined memory block；
Decoding modular converter, for according to the decoding rule corresponding with described coding rule, being decoded as discernible character string by described coding maker position；
State parameter drafting module, in described independent fixed display area 401 both sides, drawing described character string.
Channel parameters can be set by the button on signal generator keyboard, it is also possible to is set by the soft menu of signal generator, and the channel parameters of signal generator includes basic wave waveform, trigger source, output mode, modulation waveform and output impedance etc..In this illustration, basic wave waveform in channel parameters is set by the button on signal generator, concrete, basic wave waveform includes " Sine ", " Square ", " Ramp ", " Pluse ", " Noise " and " Arb ", and they switch over selection respectively through " Sine ", " Square ", " Ramp ", " Pluse ", " Noise " and " Arb " key on signal generator keyboard and set.Trigger source switches over setting by the soft menu " trigger source " under Menu key " triggering ".Output mode then can be switched over by " Mod ", " Sweep " and " Burst " key on keyboard.Modulation waveform and output impedance are also switch over setting by the soft menu under Menu key.
In this illustration, coding rule specifically so limits: when " Sine ", " Square ", " Ramp ", " Pluse ", " Noise " and " Arb " key on keypad sets " Sine ", " Square ", " Ramp ", " Pluse ", " Noise " and " Arb " basic wave waveform respectively, the coding maker position of they correspondences respectively " 1 ", " 2 ", " 3 ", " 4 ", " 5 ", " 6 ".Other channel parameters such as output mode are also suitable same coding rule, during " Mod ", " Sweep " and " Burst " key on keypad, and corresponding coding maker position respectively " 1 " " 2 " " 3 ".
The storage position of each channel parameters has been reserved in advance in memory block, in the preferred embodiment, for basic wave waveform, output mode, trigger source, modulation waveform, output impedance preset 5 sequential memory area, be respectively used to storage the coding maker position " 1 " of basic wave waveform, " 2 ", " 3 ", " 4 ", " 5 ", " 6 "；Storage the coding maker position " 1 " of output mode, " 2 ", " 3 " etc..Concrete, when selected basic wave waveform parameter, when " Sine " button on keypad, in the memory area being used for storing basic wave waveform, just save coding maker position " 1 "；During " Square " button on keypad, in the memory area being used for storing basic wave waveform, just save coding maker position " 2 "；During " Ramp " button on keypad, in the memory area being used for storing basic wave waveform, just save coding maker position " 3 "；The like.Same, when selected output mode parameter, when " Mod " button on keypad, in the memory area being used for storing output mode, just save coding maker position " 1 "；During " Sweep " button on keypad, in the memory area being used for storing output mode, just save coding maker position " 2 "；During " Burst " button on keypad, in the memory area being used for storing output mode, just save coding maker position " 3 ".
Parameter acquisition module can inquire about predetermined memory area successively, and sequentially reads coding maker position from predetermined memory block.
In this illustration, when getting coding maker position " 1 " in basic wave waveform predetermined storage area, according to the decoding rule corresponding with coding rule, coding maker position " 1 " is decoded as discernible character string " Sine ".
Independent fixed display area 401 both sides on display screen 400, drafting character string " Sine ".
In this illustration, depicting the channel parameters of two signalling channels side by side, wherein " Sine " and " HighZ " of first row is basic wave waveform and the output impedance of passage 1 respectively." Sine " and " HighZ " of second row is basic wave waveform and the output impedance of passage 2 respectively, owing to the output mode in passage 1 and 2 is basic wave output, so there is no these channel parameters of trigger source, output mode and modulation waveform, correspondence position does not show content.
Above-described it is only the preferred embodiments of the present invention; it is it should be understood that; the explanation of preferred embodiment above is only intended to help to understand method and the core concept thereof of the present invention; the protection domain being not intended to limit the present invention; the any amendment made within all thought in the present invention and principle, equivalent replacement etc., should be included within protection scope of the present invention.
Claims (10)
1. a system for display channel state on signal generator, described signal generator at least includes a signalling channel and a display screen, it is characterised in that include with lower module:
Channel status judge module, is used for judging that described signalling channel is on or off；
Channel status drafting module, for when described signalling channel is opened, one on the display screen of described signal generator independent of in the independent fixed display area of other viewing areas, draw a channel status and open mark, when described signalling channel is closed, in described independent fixed display area, drawing a channel status and close mark, described independent fixed display area is shown in arbitrary display interface of described signal generator.
2. system according to claim 1, it is characterized in that, described independent fixed display area is a rectangular region, described independent fixed display area includes a graded bedding and a channel status draws layer, described graded bedding is with described rectangular bottom for string, the minor arc region formed in described rectangular region, the color of the pixel in described minor arc region is from the central point of described string, the radial direction round along described minor arc place is with linear rule gradual change, described channel status is drawn and is placed on described graded bedding, described channel status draws the colouring discrimination of layer in the color of described graded bedding, described channel status opens mark or described channel status is closed mark and is plotted on described channel status drafting layer.
3. system according to claim 2, it is characterised in that draw described channel status with the color identical with current channel color and open mark, the color to be different from described current channel is drawn described channel status and is closed mark.
4. system according to claim 3, it is characterised in that the color of the pixel between the arc of the upper base of described rectangular region extremely described minor arc is identical with the background color of described display screen.
5. system according to claim 4, it is characterised in that the midpoint on the upper base of described rectangular region is the end points of a diameter of the circle at described minor arc place.
6. the system according to claim 2,3,4 or 5, it is characterized in that, it is isosceles-trapezium-shaped that described channel status draws the shape of layer, and going to the bottom of described isosceles trapezoid overlaps with described string, and the color of the pixel within described isosceles trapezoid is identical with the background color of described display screen.
7. system according to claim 6, it is characterised in that the color of two waists of described isosceles trapezoid and the pixel of upper base, is different from the color of described graded bedding, and by two waists to upper base with linear rule gradual change.
8. the system according to claim 1,2,3,4 or 5, it is characterised in that in described independent fixed display area, the channel status drawing multiple signalling channel side by side opens mark or channel status closedown mark.
9. system according to claim 8, it is characterized in that, described channel status drafting module, is plotted as, for described channel status unlatching mark or described channel status being closed mark according to the current system language of described signal generator, the mark represented with current system language.
10. the system according to claim 1,2,3,4 or 5, it is characterised in that also include
Path setting module, for setting the channel parameters of described signalling channel；
Status set module, for according to a coding rule, being converted to a coding maker position by described channel parameters；
Memory module, for storing described coding maker position in predetermined memory block；
Parameter acquisition module, for sequentially obtaining described coding maker position according to described predetermined memory block；
Decoding modular converter, for according to the decoding rule corresponding with described coding rule, being decoded as discernible character string by described coding maker position；
State parameter drafting module, in described independent fixed display area both sides, drawing described character string.
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| CN110426684A (en) * | 2019-08-15 | 2019-11-08 | 北京无线电测量研究所 | Phased Array Radar Antenna front display methods, device, system and storage medium |
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