SU1541786A1 - Radar television indicator - Google Patents

Abstract

The purpose of the invention is to improve the accuracy of reproduction. The indicator contains a master oscillator, the first and second outputs of which are connected to the corresponding inputs of the scanner unit and to the corresponding inputs of the video monitoring unit. It additionally introduces a storage cathode ray tube unit, a sweep switch, the first and second digital-to-analog converters, the first and second keys, and the amplitude selector. 1 il.

Description

The invention relates to television technology and can be used as a radar indicator for detecting oil pollution of the sea surface.

A radar television indicator is known that contains a video monitoring unit whose signal input is a radar signal input and the synchronization input is connected to the output of the driver P. However, this indicator does not provide the required accuracy of reproduction of signals from oil-1s of the sea surface.

Closest to the invention is a radar television indicator comprising a master oscillator, the first and second inputs of which are connected to the corresponding inputs of the scanner unit and the video monitor unit, the signal input of which is connected to the output of the read amplifier, the first output of the master oscillator connected to the first input of the control unit 2j „

A disadvantage of the known indicator is also in the low reproduction accuracy of the de-control block of oil pollution zones of the sea surface on the screen.

The purpose of the invention is to improve the accuracy of reproducing radar information, in particular, oil pollution zones of the sea surface.

The goal is achieved in that the radar television indicator containing the master oscillator, the first and second outputs of which are connected to the corresponding inputs of the scanner unit and to the corresponding inputs of the video control unit, the signal input of which is connected to the output of the read amplifier, the first output of the master oscillator connected to the first input of the control unit e entered the storage cathode ray tube unit (ZELT), the switch scanner, the first and second5 digital-to-analogue converters ne vy and second switches and the amplitude CE lecturer, the input of which is .The inputs radar signal, and output through the first switch connected to the input target block ZELT ,, to an input of the second switch and to the output of the first 1-tsifroznalo traction converter, wherein

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The first, second and third inputs of the first digital-to-analog converter are respectively connected to the first, second and third inputs of the second digital-to-analog converter and connected respectively to the first, second and third outputs of the control unit, the fourth output of which is connected to the cathode input of the ZELT block, and the second input is the input signal of the angular coordinates of the radar, the first and second outputs of the scanner unit are connected respectively to the first and second inputs of the sweep switch, the third and fourth inputs of which These are the inputs of the radar sweep signals, the control input of the sweep switch is connected to the second output of the control unit and to the control input of the first key, as well. The first and second outputs of the switchboard sweep are connected to the corresponding inputs of the ZELT unit, the modulator input of the ZELT unit is connected to the output of the second digital-to-analog converter, the third output of the control unit is connected to the control input of the second key, the output of which is connected to the input of the read amplifier.

Figure 1 shows the structural electrical circuit of the television indicator of the radar} in Fig. 2 are diagrams explaining the operation of the control unit; in Fig - structural scheme of the target ZELT

Radar TV indicator, contains a radar transceiver 1 with antenna 2 vertical polarization, amplitude selector 3, video control unit 4, control unit 5, first 6 and second 7 analog-to-digital converters, electron-tube storage tube 8 (ZELT), master oscillator 9, the scanning unit 10, the first AND and the second 12 keys, the recording amplifier 13, the scanning signal amplifier 14, the reading amplifier 15 and the scanning switch 16 and the decoupling element 17.

Unit 8 ZELT contains a storage cathode-ray tube 18 and a deflecting system 19.

On diagrams 20-24 (figure 2) are respectively the clock pulses of the master oscillator 9 and pulses

start preparation, recording and reading, produced by control unit 5.

The target ZELT 18 consists of insulated elements 25 located on a conductive substrate 26, in front of which an equalization grid 27 is installed.

The television indicator of the radar works as follows.

Formed by transceiver

The sounding pulse is emitted by the antenna 2 with vertical polarization. The signal reflected from the sea surface under study is received by antenna 2 and fed to transceiver 1 where it is amplified and detected. From the output of transceiver 1, the radar signal is fed to the input of the amplitude selector 3, After the 21 Start signal arrives, the unit The 10 sweeps form signals which, passing through the switch 16 and the amplifier 14, are fed to the deflecting system 19 of the ZELT 18 of the block 3, turning s of the body into a ZIZ beam 18, which scanning the target surface. A bias voltage is applied to the conductive substrate 26 of the target, which is covered with a mosaic of isolated elements of silicon dioxide 25, from decoupling element 17, from the second digital-analogue converter 7, controlled by the signal 22 Preparing coming from the third output of the unit

5 controls

The magnitude of the bias voltage of the conductive substrate 26 of the target is 4-5 V less than the voltage of the equalizing grid 27 s which is at a constant potential.

The secondary electron emission coefficient of the isolated elements of the target in this case is greater than 1, and they acquire a positive charge. The potential of the isolated elements 25 rises until the potential of the leveling grid 27 of the ZELT 18 target is reached. This process occurs very quickly and after the selected In advance of a 2–3-fold scanning of the target, all isolated elements 25 have a potential of (+) 5 V relative to the conductive substrate 26 of the target.

Then, the control unit 5 generates a signal 23, which switches the ZELT 18 to the recording mode. First key

I1 allows the passage of a signal with

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the amplitude selector 3 through the amplifier 13 to the conductive substrate 26 of the target ZELT 18, the first digital-to-analogue converter 6 sets a voltage on the ZELT 18 modulator, which corresponds to the typical mode. At the output of the second digital-to-analog converter 7, a voltage of 15 V is set, which, via the coupling element 17, is applied to the conducting substrate 26 of the target ZELT 18, and the switch 16 switches to the inputs

amplifier 14 signals of radar sweep, providing a radial-circular sweep of the ZELT 18 beam, synchronous and common-mode rotation of the antenna 2 "

During the subsequent zero-potential mode, the potential of the conducting substrate 26 and the target of the ZELT 18 is modulated by an input radar signal, which is a scattered signal of a sea surface with oil pollution, while the electron beam of constant density scans the target its surface is a radial-circular raster law. To efficiently extract oil spot or petroleum signals from the probing signals scattered by the sea surface, the signals are integrated into the SELT 18 due to repeated accumulation, which allows increasing the signal-to-noise ratio and, thus, increasing the probability of spot detection. The selected number of frames of accumulation of the recorded video signal, therefore, the potential of the substrate 26 of the target is regulated within 0-5 V, respectively, for the level of white and black. The coefficient of secondary electron emission of the target is B 1, and the electron beam shifts the potential of the target towards the potential of the cathode when it commutes this section. After an n-fold scanning of the target by a radial-circular raster on Q, a potential relief is formed, which represents the averaged stored radar situation: since in adjacent frames the fluctuation reflection from the sea surface is uncorrelated, the signal-to-noise ratio increases by approximately П GHz.

As a result of the accumulation, those target areas on which

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the white level (i.e., the video signal level in these areas is minimal, which corresponds to the reflected signal from pollution), acquires a potential of 15 V, and the areas where the black level is recorded (the video signal level in these areas is maximum, which corresponds to the reflected signal from JQ net surface) acquire a potential of 20 B,

In the Record mode, the possibility of accumulating 2, 43 8 or 16 frames is provided, operatively selected in jj depending on the degree of waves, the selection of the number of accumulated frames is made on the panel of the control block 5, which operates in accordance with the timing diagram 20 (Fig. 2).

The synchronization of the block is missing in the recording mode by external synchronization signals, which represent the full rotation signal of the antenna 2, the angle generated by the transducer — in the other modes, the control unit 5 is synchronized by the TV frame sync pulses 20 generated by the 30 master oscillator 9 "

At the end of the recording, a signal 24 is read on the first output of the control unit 5.

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a potential of –10 V „levels absorb an intermediate value from –5 V to –10 V relative to the ZELT cat 18. The voltage value of the direct substrate 26 10 V is chosen so that the electron beam can pass between the isolated elements of 25 V areas where the white level is recorded, and can not get where the black level is recorded.

The accumulated potential relief for the signal 24 Read the change of the electron trajectory of the reading beam electrons. An electron beam with a constant current density is collimated so that the electrons hit the target at a right angle, the charged dielectric and conductive parts of target 3 form some kind of electrostatic grid that controls the current value of the electron beam reaching the target. In the load circuit, a current flows with a modeled amplitude representing the accumulated information. Reading in this case is not destructive, since the loss of isolated elements 25, which is negative for the ZELT 18 cathode, prevents the electron from falling on the target. With the arrival of the second key 12 control input to the control input, the Read command allows the read signal to pass through the amplifier

As a result, the output of the first digital-i5 readout on the video monitor converter 5 is supplied with voltage, corresponds to its typical mode, and the output of the second digital-analog converter 7 establishes a voltage of about +10 V Kom ™ 40, the mutator 16 connects to the amplifier 14 the deflection voltage of the television standard, and the video block 4 is synchronized with a clock generator clock generator 9.45

Those parts of isolated elements 25 ZELT, on which the white level is recorded, have a potential of 5 V with respect to the cathode of ZELT 18, and

on which the black level is recorded

block 4, on the other inputs of which p is given from the generator 9, frame and line sync pulses, on the screen there is a fragment of the sea surface with available spots

Since in the proposed indicator, the radar signal scattered by the sea surface accumulates in block 8, the signal-to-noise ratio increases, which distinguishes it from the known prototype as the reproducing accuracy of the image of oil pollution of the sea surface increases.

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gray potential –10 V levels are intermediate from –5 V to –10 V relative to the ZELT cathode 18. The voltage of the conducting substrate 26 10 V is chosen so that the electron beam can pass between the isolated elements 25 in the regions where the white level is recorded, and cannot pass, where the black level is recorded.

The accumulated potential relief at signal 24 A read changes the trajectories of the reading beam electrons. An electron beam with a constant current density is collimated so that the electrons hit the target at a right angle. The charged dielectric and conductive parts of the ZEL target form some kind of electrostatic grid that controls the amount of current of the electron beam reaching the target. A current flows in the load circuit with a simulated amplitude displaying the accumulated information. Reading in this case is not destructive, since the potential of the isolated elements 25, which is negative with respect to the cathode of the Selt 18, prevents the electron beam from striking the target. With the arrival on the control input of the second key 12 of the command Read, the passage of the read signal through the amplifier is permitted

i5 video reader

block 4, to the other inputs of which are supplied from the generator 9, frame and line sync pulses, a fragment of the sea surface with available spots is observed on the screen;

Since the radar signal scattered by the sea surface accumulates in block 8 in the proposed indicator, the signal-to-noise ratio increases, which distinguishes it from the known prototype as the reproduction accuracy of the image of oil pollution of the sea surface increases.

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Claims (1)

TELEVISION INDICATOR OF RA- И DIOCOLATOR, containing the master ge. a herator, the first and second outputs of which are connected to the corresponding inputs of the scan unit and to the corresponding inputs of the video control unit, the signal input of which is connected to the output of the readout amplifier, the first output of the master oscillator connected to the first input of the control unit, characterized in that, in order to increase accuracy of playback, a cathode ray tube storage unit (ZELT), a sweep switch, the first and second digital-to-analog converters, the first and second keys, and the amplitude selector , the input of which is the input of the radar signal, and the output through the first key is connected to the input of the target of the ZELT unit, to the input of the second key and to the output of the first digital-to-analog converter, while the first, second and third inputs of the first digital-to-analog converter are combined, respectively, with the first, second and third the inputs of the second digital-to-analog converter and are connected respectively to the first, second and third outputs of the control unit, the fourth output of which is connected to the input of the cathode of the ZELT unit, and the second input is the signal input of the radar coordinate coordinate is entered, the first and second outputs of the scan unit are connected respectively to the first and second inputs of the scan switch, the third and fourth inputs of which are inputs of the signals of the radar scan, the control input of the scan switch is connected to the second output of the control unit and to the control the input of the first key, and the first and second outputs of the switcher switch are connected to the corresponding inputs of the ZELT block, the input of the modulator of the ZELT block is connected to the output of the second digital alogovogo converter, the third output control unit is connected to the control input of the second switch, whose output is connected to the input of the sense amplifier. SU „„ 1541786