SU467663A1 - Device for sweeping image in radar - Google Patents

Description

one

The invention relates to shipborne radar technology and is used to reproduce a large-scale image in indicators with a limited scanning speed.

A device for scanning images in radar is known, comprising an image signal quantizer, a quantizing pulse generator, and an indicator on a cathode ray tube. Large-scale images of the indicators of such devices, the sweep of which has high speed, are characterized by low brightness.

The purpose of the invention is to increase the brightness of the image.

This is achieved by connecting the shift register and the code level converter between the quantizer and indicator, the control inputs of which through the Record-Play switch, the image scale switch and the counter are connected to the quantization pulse generator, and the Record switch connected The source of the start-up pulse of the radar, and the input “Playback” - to the output of the shift register, and the corresponding, signaling inputs of the switch are connected to the bits of the counter.

On. The drawing shows the functional scheme of the proposed device.

A sweep device: assembled in radar contains a quantizer 1

image signals, shift register 2, code-level converter 3, quantizing pulse generator 4, counter 5, image scale switch 6, "Record-Playback" switch 7, consisting of trigger 8, AND 9 and 10 circuits, and OR 11 circuit, indicator 12 on a cathode ray tube. Control outputs of quantizer 1, shift register 2, code-level converter 3 through a switch

7 "Record-Play, an image scale switch 6 and counter 5 are connected to a quantization pulse generator 4. In this case, one of the control inputs of the Switch Record 7 record is connected to the start-pulse source of the radar, and the Playback input is connected to the output of the shift register 2, and the corresponding signal inputs of the switch 7 are connected to the bits of the counter 5.

The device works as follows.

The video signal from the receiver output is fed to the quantizer 1 of the IMAGE image signals, where it is quantized in amplitude and duration and then recorded in a shift register 2 with a clock frequency that is determined by the scale and spectrum of the image signals. The quantization time interval and the shift cycle of the quantized signals in shift register 2 are set by the generator 4 nm quantization pulses and the counter 5.

The quantized signals from the output of the shift register 2 are fed to the inverse transducer 3. the code-level and read to the indicator 12 with a clock frequency determined by the sweep speed of the indicator 12 on the cathode ray tube.

The number system in which the counter 5 operates and the number of its bits depends on the image scales received in the radar and the scan rate of the indicator 12. The image scale switching is performed by the switch 6.

One cycle of time conversion of the signals received after the emission of a probe, its pulse, consists of two intervals: the recording interval and the playback interval (sweep). The boundaries of the intervals are determined by probe, pulse (start) and the same pulse that passed the path: quantizer 1 - shift register 2. These pulses control through trigger 8 of switch 7 circuits AND 9 and 10, the outputs of which are connected by the OR circuit 11 and are connected with outputs of quantizer control 1, shift register 2, and code-level converter 3.

In the first interval, recording is performed by shifting in the shift register 2 received signals and quantized signals. Quantization and shift are performed with the frequency of the quantization pulses, corresponding to its image scale, selected by switch 6 (AND 9 open). In the second interval, reading is performed by shifting from shift register 2 through converter 3, the code level to indicator 12 of recorded signals and their sweep with a frequency of shift pulses corresponding to the sweep scale (open circuit and 10).

Claims (1)

Invention Formula A device for scanning an image in a radar, comprising an image signal quantizer, a pulse generator quantization and an indicator on a cathode-ray tube, characterized in that, in order to increase the image brightness, between the quantizer and the indicator, the shift register and the code-level converter are connected in series, the control inputs of which through the Record-Playback switch, image scale switch and counter are connected with a quantization pulse generator, with In this case, the control input of the switch is “Recording connected to the source of the start-pulse of the radar, and the input“ Playback ”to the output of the shift register, and the corresponding signal inputs of the switch are connected to the bits of the counter.