SU1691880A1 - Radar data crt display unit - Google Patents

Abstract

The invention relates to automation and computing, in particular to devices for displaying radar information on a television display screen. The purpose of the invention is to increase the reliability of the displayed information by eliminating its losses and the possibility of displacing the center of the image — achieved by introducing a block 16 of the time reference for the video signal and the imager 15 of the scan point codes. In the proposed device, the reflected radar signal converted into a code does not immediately enter the block 3 of the buffer memory, but is processed in block 16 of the time signal assignment of the video signal. In this block, the digital information about the reflected signal received at an arbitrary moment in the period of the distance pulses is accumulated and after the end of the period is output for recording in the block 3 of the buffer memory. The accumulation process is carried out at a quadruple frequency pulse distance, which completely eliminates information loss. The scanner point code generator 15 generates the X and Y coordinate codes, taking into account the radar image center shift codes applied to its input, which allows expanding the range of the observed image in a given direction and thereby further increasing the reliability of the displayed information. 5 il. J

Description

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The invention relates to automation and computing and can be used in devices for displaying radar information on a television indicator screen.

The aim of the invention is to increase the reliability of the displayed radar information.

FIG. 1 shows a block diagram of the device; in fig. 2 is a functional diagram of an azimuth tag former; in fig. 3 - functional diagram of the angle-code converter; in fig. 4 is a functional diagram of a sweep point code generator; in fig. 5 is a functional block diagram of the time reference video signal.

The device contains an analog-to-digital converter 1 (ADC), synchronizer 2, buffer memory block 3, address driver 4, driver control generator 5, raster memory block 6, pulse distributor 7, digital-analog converter 8 (D / A converter), video - deamplifier 9, shaper 10 scanning voltages, deflecting system 11 (OS), cathode-ray tube 12 (CRT), shaper 13 azimuth marks (FAM), angle-code converter 14, shaper 15 code of scanning points, time block 16 video signal assignments.

The shaper 13 azimuth marks contains a counter-divider 17 by twelve, a shaper 18 of a single pulse, a shaper 19 marks of thirty degrees, the elements are NOT 20 and 21.

The angle-code converter 14 contains a binary counter 22, elements NOT 23 and 24, register 25, sign maker 26, comparison block 27, constant memory block 28 of sine (cosine) values, registers 29 and 30.

Shaper 15 of the sweep points code contains a range multiplier 31 to the sine of the current angle, range multiplier 32 to the cosine of the current angle, register 33. center offset along the X coordinate, center offset register 34 along the Y coordinate, dividers 35, 36 by four, driver X code 37 , the shaper 38 of the U code, the shaper 39 of the pulse of the end of the sweep.

The temporary anchor block 16 contains an AND element 40, the HE elements 41 and 42, D-flip-flops 43, 44, a comparison block 45, the HE elements 46 and 47.

Items 48-51 designate the information inputs from the first to the fourth, respectively, and the position 52 of the control input of the device.

The device works as follows.

Analog-to-digital converter (ADC) 1 converts analog information received at its information input to the ECM into a digital luminance code.

The luminance code from the output of the A / D converter 1 is fed to the information input of the block 16 for assigning a video signal to distance pulses.

0 Through elements 41, 42, the luminance code is sent to the D-inputs of D-flip-flops 43 and 44, to the input of which through the element 40, from the synchronizer 2, the distance pulses of a quadruple repetition frequency. When the luminance code coincides with the pulses, the luminance code is written to the D-flip-flops 43 and 44. Distance pulses are sent to the setup input of the D-flip-flops 43 and 44 of synchronizer 2, resetting the D-flip-flops 43 and 44 to the left state. Thus, during the period of the pulse distance repetition, the video signal to the D-flip-flops 43, 44 is recorded four times. The outputs of the D-flip-flops 43 and 44 are connected to the output B of the block 45 compared to 5, and also through elements 1 of HE 46 and 47 are output to the block of 16. The input of the comparison block 45 through the elements of HE 41. 42 receives the luminance code. If the code at input A is greater than the code at output B, then

0 output A B according to Vits level log. 1, which arrives at the second input of the element And 40. If there is at the second input of the element And 40 log. 1 quadruple frequency pulses are passed to write the code

5 luminosities on D-flip-flops.

The luminance code from the outputs of the block 16 of the video signal to the distance pulses is fed to the information inputs of the block 3 of the buffer memory.

0 Synchronizer 2 is synchronized by a Start pulse arriving at its input from the radar. The second (installation) input of synchronizer 2 from the first output of the former 15 sweep point code is received

5 signal End of sweep. Synchronizer 2 generates signals that control the operation of the device, and contains a quartz oscillator, counters-dividers, decoders, distance mark makers, control pulse formers, control pulse shaper, range pulse shaper, frame pulse shaper, damper shaper, shaper

5 read / write pulses (not shown). In synchronizer 2, a crystal oscillator generates reference pulses whose frequency is equal to the frequency of decomposition pulses of a television raster and a multiple of the frequency of the range pulses. Reference pulses

served on counters-dividers, as well as on the control input of the distributor 7 pulses. From the outputs of the counter-dividers, the codes are sent to the decoders forming the sequence of shifted pulses and to the driver of the control pulses, which is a permanent programmable memory. From pulses taken from the decoders and from pulses of a constant programmable memory, pulses are generated that control the device. Line, frame and damping pulses from synchronizer 2 are fed to the shaper of 10 sweep voltages. Shaper 10 comprises a line generator, a frame scan generator, and line and frame voltage amplifiers (not shown); line and frame sweeps from amplifiers arrive at the deflecting system 11 of the CRT 12. Small azimuth pulses (MAI) and the North sign from the radar antenna rotation sensor arrive at the shaper 13 azimuth marks at inputs 48 and 49. MAI and North signals through HE elements 20 and 21 are fed to the imaging unit 14 angle code.

By the sign of North, the counter-divider 17 by twelve is set to the zero state. The signals of the MAI arrive at the counting input of the splitter counter to twelve, from the output of which every twelfth pulse arrives at the first input of the former 18 of a single pulse, the second input of which from the synchronizer 2 receives the range pulses. The first; the range impulse that came after the twelfth impulse of the MAI arrives at the shaper of 19 thirty-degree marks. The latter contains a scheme for binding to a trigger pulse and a trigger. The start pulse, which coincides with the twelfth MAI pulse, triggers the trigger, and the Disruption pulse, coming from synchronizer 2, switches to its original state. Thus, on the way out; the trigger generates a pulse that corresponds to a thirty-degree tag. Impulses of thirty-degree marks arrive at ADC 1. The elements of MAI and North enter the first two inputs of the converter 14 through the elements HE 20 and 21.

The angle-code converter 14 converts linear corner marks into the sine cosine code of the current angle.

By a North pulse arriving at the installation input of the binary counter 22, the binary counter 22 is set to the zero state. Binary counter 22 counts the MAI impulses arriving at its

counting input For example, 4096 pulses arrive at 360 ° radar antenna rotation, for example, each pulse arrives at a time during which the antenna rotates through an angle of 5 ° 27.

Thus, the number of MAIs that arrived after the arrival of the North pulse determines the angle of rotation of the antenna. The code received at the outputs of binary counter 22 is an angle code. The code from the two most significant bits of the binary counter 22 through the first register 25 is fed to a sign maker 26, where sine and cosine signs are formed. The remaining bits of the binary counter 22 are connected via the first register 25 to the constant-memory unit 27 of the sine-cosine values, with the penultimate bit being fed through the comparison circuit 27. The constant memory block 28 of the sine-cosine values of the current angle is programmed so that each angle code at its input corresponds to a sine or cosine of the angle at its output.

The sine and cosine codes of the angle are written to registers 29 and 30, from the outputs of which the code of the sweep points is transmitted to the imaging unit 15.

In the imaging unit 15, the code of the sweep points points, the sine code is fed to the input of the range multiplier 31 to the sine of the current angle, the cosine code to the input of the range multiplier 32 to the cosine of the current angle. The impulse start multipliers 31 and 32 are set to the zero state. The counting inputs of the multipliers 31 and 32 are pulsed distance. In order to increase the accuracy of multiplying by distance, the pulse repetition rate of the distance should be four times the range sampling frequency. The number of pulses of the distance M should be

k, D -4

M as well

where D is the range of the radar, km;

d - range discrete, km.

Multipliers are built on frequency multiplier counters and can be implemented on 133IE8 chips. The sine and cosine codes of the angle go to the inputs of the multiplier chip 133IE8.

The number of pulses Ki, Ka at the outputs of the multipliers 31 and 32 is equal to:

  sin o;

  cos, where a is the current angle;

M - the number of impulses distance.

To match the repetition period of the pulses Ki and Ka to the decomposition points of the television raster, the repetition period

the output pulses of the multipliers 31 and 32 are divided into four on dividers 35, 36. The code for displacing the center in coordinates X, Y by the control pulse from the synchronizer 2 is written to registers 33 and 34 for displacing the center in coordinates X, Y and arriving at the inputs of the formers 37 codes X and 38 codes U. The counting inputs of the drivers 37 of code X and 38 codes Y receive pulses Ki and K2, the repetition frequency of which is divided into four. Shaper 37 code X and shaper 38 code Y are built on binary counters with pre-recorded code. The control center offset code is written into the counters. When pulses arrive at the counting input, a summary code is formed at the counter outputs.

Thus, taking into account the center offset code by the shapers 37 of the X code and 38 of the Y code, the X code and Y code are formed. The number of bits of X, Y codes is determined by the number of points in the raster line and the number of lines. When the code exceeds the number of points in a line and the number of lines in the raster of the imager 37, the X code and 38 U code generate overflow pulses, which are fed to the sweep end imager 39. The end scanner 39 generates the End of Sweep signal, which is fed to synchronizer 2. Codes X and Y are sent to block 3 of the buffer memory.

The buffer memory unit 3 is designed to record information of two radar sweeps (two probes) and contains the first memory matrix for the first sweep, the second memory matrix for the second raevote, the address generator of the first memory matrix, the address generator of the second memory matrix, output switch and sweep counter (not shown). At the time of the radar sounding, the X code, the Y code and the luminance code of one radar sweep are recorded in the first memory array. From the second memory array at this time, the information is read. The address for recording information is formed from range pulses coming from the output of synchronizer 2. The address for reading information is formed from pulses synchronous to the raster decomposition pulses. At the same time, the repetition period of read pulses corresponds to sixteen periods of raster decomposition pulses. If the address generator of the first memory array generates an address for writing, the address generator of the second memory matrix generates the address of the day of reading.

The switch is controlled by the sweep counter signals, so the memory matrix with which the information is read is connected to the switch output.

Four lower bits of the X code from block 3 are fed to block 6 of the raster memory, the remaining bits of the X code and all bits of the Y code are sent to the shaper 4 addresses. The luminance code is fed to the driver 5 control signals.

Shaper 4 is designed to generate an address for recording and reading information from block 6 and contains a binary pulse decomposition counter for the line, a binary string counter, a switch (not shown). The address to write to block 6 is the codes X and Y, which are fed to shaper 4 from block 3. The address to read from block 6 is the code from the outputs of the binary raster decomposition pulse counter and the outputs of the binary row counter. The write address goes to one input of the switch, and the read address goes to the other. The switch is controlled by a signal arriving at address shaper 4 from synchronizer 2. Data for writing to block 6 at the address generated by shaper 4 is received from the outputs of shaper 5 of control signals. Shaper 5 is designed to compare the luminance code from the buffer memory unit 3. If the luminance code of block 3 of the buffer memory is less than the luminance code of block 6 of raster memory, then the luminance code of block 6 of raster memory is lowered by one and again written to block 6 of raster memory at the same address.

The driver 5 of the control signals comprises a register, an adder, a comparison unit and a switch (not shown).

Before writing the luminance code at any address in the raster memory block 6, information from block 6 is read at this address. The read information is written to the register, from the register it goes to the inputs of the adder and the comparison block. During the writing of the luminance code in block b, the luminance code from the register and the luminance code read from the buffer memory block 3 are compared in the comparison block. If the luminance code read from block 3 is greater than the luminance code read to this address from block b, the signal supplied from the comparison block to the switch allows the code of brightness 3 of the buffer memory to pass through the switch to the output. If the brightness code of block 3 of the buffer memory is less than the code of brightness of block 6

raster memory, the signal from the comparison unit switches the switch to the translation of the code to the output from the adder, in which the luminance code is reduced by one luminance gradation,

The raster memory unit 6 contains a decoder, a memory matrix for each bit of brightness, a memory matrix for forming a trace of the displayed point (not shown). Each matrix has a memory capacity equal to the number of raster decomposition points. Information is written in each matrix bit-wise, reading - in columns (16 points in the column). When writing, the selection of memory chips in the block is performed by a decoder. Four low bits of the X code arrive at the inputs of the decoder. The address inputs of all the matrices are combined.

Information from each memory matrix is fed in parallel to the distributor 7, which contains a counter-divider of sixteen, shift registers (not shown), the number of which is determined by the number of memory matrices of the raster memory block b. The information read from the memory matrices in parallel form by the pulse of the divisor counter by sixteen is written to the shift registers in such a way that the first point of the row of the column is at the output of the register. The information shift (reading) is carried out by raster decomposition pulses, coming from the fifth output of synchronizer 2. Thus, from the shift registers of each bit at the time of raster display, information from each raster point is read. This information is fed to the inputs of the D / A converter 8, the output of which forms the analog luminance signal of each raster point corresponding to the luminance code. This signal is fed through video amplifier 9 to the CRT modulator 12 and reproduced on the screen at the corresponding points of the raster.

Thus, the invention makes it possible to increase the reliability of the displayed radar information by eliminating its losses.

In block 16, the digital information about the reflected radar signal received at an arbitrary time period of the distance pulses is accumulated and, after the end of the period, is output for writing to the block 3 of the buffer memory. The accumulation process is carried out at the quadruple frequency of the distance pulses.

The shaper 15 sweep point codes generates the X, Y coordinate codes, taking into account the center shift codes applied to its input. The accumulated digital information OP of the reflected signal, arriving at an arbitrary moment of the period of the radar image, allows us to expand the range of the observed image in a given direction and thus further increase the reliability of the displayed information.

FORUMAWLAH AND ISLANDS

A device for displaying radar information on a cathode-ray tube (CRT) screen containing a sweep voltage generator, the output of which is connected to a deflection system of a CRT, a video amplifier whose output is connected to a CRT modulator, and an input to the output of a digital-analog converter, whose input connected to the output of the pulse distributor, the information inputs of which are connected to the first output of the raster memory block, and the control input to the first control input of the analog-digital converter, W The control input of which is connected to the first output of the azimuth mark maker, the second output of which is connected to the information input of the angle-code converter, the first control input of which is connected to the third output of the synchronizer, and the second control input to the fourth control azimuth mark maker input input, the first and second information inputs of which are, respectively, the first and second information inputs of the device, the buffer memory block, the first equal to L which is input yuschy

the control input of the device and is connected to the second control input of the azimuth mark maker, the third - to the control input of the analog-digital converter with the control input

synchronizer, the fifth output of which is connected to the first control input of the voltage sweep voltage generator, the second control input of which is connected to the sixth output of the synchronizer and to the first

the control input of the address former, the second control input of which is connected to the seventh synchronizer output, the second control input of the buffer memory block and the first control input of the raster memory block, the first information input of which is connected to the first output of the buffer memory block, and the second information input - with the first output of the address generator, the second output of which is connected to the first information input of the control signal generator, the output of which is connected to the second control input of the raster the second memory input, the second information input with the second output of the raster memory block, and the third information input with the second output of the buffer memory block, the third output of which is connected to the first information input of the address generator, the first control input of the control signaling generator is connected to the eighth output of the synchronizer, the information input of the analog-to-digital converter is the third information input of the device, characterized in that, in order to increase the reliability of the displayed information, em eliminates its losses and the possibility of displacing the center of the image, the device contains a block of temporary video signal assignment, the information input of which is connected to the output of the analog-digital converter, and a scanner point code generator, the first and second information inputs of which are connected respectively to the first and second outputs of the angle converter - code, first control input - with control input

devices, second control input — with the third control input of the azimuth mark maker, the ninth output of the synchronizer and the first control input of the video timebinding unit, the second control input of the video timebinding block is connected to the tenth output of the buffer memory block and with the second control input of the driver control signals, and

the output is connected to the first information input of the buffer storage unit, the third control input of the scanner point code generator is connected to the third output of the synchronizer, the first output to the setup input of the synchronizer, the second output to the second information input of the buffer storage block, and the third information input is the fourth information input device.

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Claims (1)

Claim A device for displaying radar information on the screen of a cathode ray tube (CRT), containing a voltage generator of scans, the output of which is connected to a rejecting CRT system, a video amplifier whose output is connected to a CRT modulator, and the input to the output of a digital-to-analog converter, the input of which is connected to the output pulse distributor, the information inputs of which are connected to the first output of the raster memory unit, and the control input to the first control input of the analog-to-digital converter, second the first control input of which is connected to the first output of the azimuthal markers, the second output of which is connected to the information input of the angle-code converter, the first control input of which is connected to the third output of the synchronizer, and the second control input - to the fourth output of the synchronizer and to the first control input of the azimuthal labels, the first and second information inputs of which are respectively the first and second information inputs of the device, a buffer memory unit, the first control the input of which is the control input of the device and is connected to the second control input of the azimuth marking device, the third control input of the analog-to-digital converter, with the control input of the synchronizer, the fifth output of which is connected to the first control input of the scan voltage generator, the second control input of which is connected to the sixth the output of the synchronizer and with the first control input of the address generator, the second control input of which is connected to the seventh output of the synchronizer, the second the control input of the buffer memory block and with the first control input of the raster memory block, the first information input of which is connected to the first output of the buffer memory block, and the second information input - with the first output of the address shaper, the second output of which is connected to the first information input of the control signal shaper, the output of which is connected to the second control input of the raster memory unit, the second information input to the second output of the raster memory unit, and the third information input to the second output a buffer memory unit, the third output of which is connected to the first information input of the address generator, the first control input of the driver of control signals is connected to the eighth output of the synchronizer, the information input of the analog-to-digital converter is the third information input of the device, which is necessary to increase the reliability the information displayed by eliminating its losses and the possibility of shifting the center of the image, the device contains a block of time reference video signal, inform the input of which is connected to the output of an analog-to-digital converter, and a code generator of scan points, the first and second information inputs of which are connected respectively with the first and second outputs of the converter, the angle code, the first control input with the control input of the device, the second control input with the third control input of the shaper of azimuth marks, the ninth output of the synchronizer and with the first control input of the video timing block, the second control input of the timing block to the ideosignal is connected to the tenth output of the buffer memory unit and to the second control input of the control signal generator, and the output is connected to the first information input of the buffer memory module, the third control input of the scan point code generator is connected to the third synchronizer output, the first output is to the synchronization installation input, the second the output is to the second information input of the buffer memory unit, and its third information input is the fourth information input of the device. Launch Small azimuthal sweep North ’ From · {synchronizer —Ы0 To analog to digital converter On spruce -3> \ the sine-cosine / current angle code From Synchronizer From the world 's form, they are mutant. tags I From p synchro bottom 4 torus b FIG. I FIG. 3 OM SRig.Z