JPS5848072B2 - Marker display device for wide range underwater detection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a marker display device for measuring the distance, direction, etc. of a displayed detected object in an underwater detection device that performs detection in a wide range of directions.

FIG. 1 shows an example of displaying a marker signal M on a cathode ray tube display surface, and the marker signal M can be placed at an arbitrary position. By displaying it at the position of the detected object, its direction, distance, etc. can be measured.

The rusk on the cathode ray tube display (■) requires several seconds for one rusk when the detection distance is long.

When displaying the marker signal M on such a rask,
In order to display the marker M without flickering, a method is used in which the display operation is temporarily interrupted at regular intervals while one rask is drawn, and the marker M is displayed several times during the interruption time. .

Therefore, during this interruption time, a portion of the detected image is extracted and displayed.

In displaying the marker M in the above-described manner, this invention allows the parts to be extracted on the rask to be extracted at predetermined specific distances, thereby displaying the extracted parts on the rask in the detected image. It is characterized by being used as a distance scale.

Examples of the present invention will be described below.

In FIG. 2, the wave transmitting/receiving device 1 is based on the transmitter 2.
Ultrasonic pulses are transmitted in a wide range of directions at regular intervals.

In the wave transmitting/receiving device 1, a large number of wave transmitters/receivers are arranged in advance so as to be oriented in each direction, and all of the wave transmitters/receivers are simultaneously excited to transmit ultrasonic pulses in a wide range of directions.

The reflected waves returning from each direction are received by transducers oriented in the respective directions, and then sent to the time series circuit 3.

The time series circuit 3 converts the reflected waves returning from each direction into a time series at high speed and transmits the time series.

The time-series signal is then sent to the brightness control terminal of the cathode ray tube display 5 via the switch 4.

On the other hand, the output of the transmitter 2 is sent to an X-axis deflection circuit 6 and a Y-axis deflection circuit 7.

Based on the X-axis deflection circuit 6, the Y-axis deflection circuit T, and the transmitter 2, the electron beam of the cathode ray tube 5 is scanned in a spiral manner in synchronization with the transmission of ultrasonic pulses.

The X-axis deflection circuit 6 sends out a sine wave voltage whose amplitude increases in a sawtooth manner, and the Y-axis deflection circuit 7 sends out a cosine wave voltage whose amplitude increases in a sawtooth manner.

The sine wave voltage of the X-axis deflection circuit 6 is guided to the X-axis deflection circuit of the cathode ray tube 5 via a switch 8, and the cosine wave voltage of the Y-axis deflection circuit 70 is guided to the Y-axis deflection circuit of the cathode ray tube 5 via a switch 9. .

As a result, the electron beam of the cathode ray tube 5 is swept in a spiral manner.

Then, in synchronization with this spiral sweep, the time series circuit 3 performs a time series operation on the received signal. That is, when the electron beam of the cathode ray tube 5 is swept in a spiral shape, the time series circuit 3 performs a time series operation on the received signal. The received signal is transmitted in time series.

As described above, while the underwater detection signal in a wide range of directions is displayed, the marker signal generation circuit 10 generates a marker signal, thereby displaying the marker M on the cathode ray tube display I.

The marker M can be displayed in any shape by appropriately deflecting the electron beam.

Further, the marker M is not limited to a spot-like marker as shown in FIG. 1, but it is also possible to display a distance marker concentric with the spiral sweep.

The marker deflection voltage sent out by the marker signal generation circuit 10 is guided to the X-axis and Y-axis deflection circuits of the cathode ray tube 5 through the switching devices 8 and 9, respectively, and the luminance signal for displaying the marker M is transmitted through the switching devices 8 and 9. 4 to the brightness terminal of the cathode ray tube 5.

Therefore, when the switches 4, 8, and 9 are switched to the marker side, the marker M is displayed on the cathode ray tube display (2).

This switching operation is performed by the control circuit 11 as follows.

The control circuit 11 switches the switches 4, 8, and 9 to the marker side at regular intervals after the ultrasonic pulse is transmitted by the transmitter 2 for a length i''L.

At this time, the switching times of the switching devices 4, 8, and 9 are set so that the display distance on the cathode ray tube display (FIG. 1) is changed every predetermined specific distance.

For example, set the detection distance on the cathode ray tube display to 1 000
m, the switching operation is performed every 200 m.

Therefore, if the propagation speed of ultrasonic waves is 1500 m/sec, the time required to travel 200 m back and forth is approximately 267 m.
sec, the control circuit 11 performs a switching operation every 267 msec to display the marker M after transmitting the ultrasonic pulse based on the transmitter 2.

As a result, the marker M is displayed several times on the cathode ray tube display (2) while one rask is drawn, and thereby the marker M can be displayed without flickering.

Further, when the marker M is displayed, a part of the displayed image is extracted, and the extracted part appears on the concentric circle indicated by the dotted line in FIG.

As is clear from the above, this concentric circle portion appears at every fixed distance of the detected image on the cathode ray tube display I.

Therefore, this can be used as a distance scale for the displayed detection image.

[Brief explanation of the drawing]

FIG. 1 shows an example of a cathode ray tube display, and FIG. 2 shows an embodiment of the present invention.

Claims (1)

[Claims] 1. In a wide range underwater detection device that transmits ultrasonic pulses in a wide range of directions and time-series the reflected waves returning from each direction and displays them at corresponding positions on a cathode ray tube display, a marker signal generation circuit that displays a marker signal; and a switching device that temporarily interrupts the display of the time-series signal to switch and display the marker signal, and performs the switching display at every specific distance on the cathode ray tube display. A marker display device in a wide range underwater detection device comprising: