JP2684903B2 - Display for air traffic control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air traffic control system display device, and more particularly to a random stroke type air traffic control system display device for time-divisionally displaying radar video and digital data.

[0002]

2. Description of the Related Art A conventional display device for an air traffic control system, as shown in FIGS. 2 and 3, has an external radar trigger signal 12 input from an external radar trigger signal generator 50.
0 is converted into a delay trigger signal 121 by the delay circuit 12 in order to match the time with the video, and the sweep counter 14
Then, the sweep gate 122 for displaying the sweep is generated in synchronization with the sweep clock input by the clock generation circuit 13. When the sweep gate 122 becomes "low (L)", the digital data control circuit 15 sets the digital gate 123 which makes the digital data valid "high (H)" to make the digital data valid. Then, by the next external radar trigger signal 120, the digital gate 123 is set to "L" to invalidate the digital data.

Next, the data selection circuit 18 transfers the sweep data 16 when the sweep gate is "H",
When the digital gate is "H", the digital data 17 is switched so as to be transferred and output. The output data is
The D / A converter 19 converts the digital data into analog data to generate the deflection waveform 124, and the deflection amplifier 2
It is amplified by 0, supplied to the CRT 21, and displayed on the screen.

[0004]

However, in this conventional display device, the sweep data and the digital data are time-divisionally displayed by the external radar trigger signal. Therefore, when the external radar trigger signal is not input, the sweep gate or the digital gate is displayed. It becomes impossible to generate control signals such as. For this reason, there is a problem in that data cannot be sent to the CRT, nothing is displayed on the display device, and operation is interrupted.

[0005]

It is an object of the present invention to provide a display device for an air traffic control system, which is capable of improving the disadvantages of the prior art and particularly effectively preventing a data display interruption accident caused by an external radio wave interference in the air traffic control system. To do
With that purpose.

[0006]

In the present invention, there is provided a means for solving], in a air traffic control system display of random stroke method of time division display of the sweep data and digital data based on this input the external Redatoriga signal, the external
Trigger signal detection to detect the presence or absence of radar trigger signal input
Circuit and internal radar equivalent to the external radar trigger signal
Internal radar trigger signal generation circuit that outputs trigger signal
And the external radar trigger signal and the internal radar trigger
A trigger selection circuit for selectively outputting any of the signals
Equipped at the input stage of the external radar trigger signal, the trigger
In the selection circuit, the trigger signal detection circuit is the external radar.
When an input disconnection of the trigger signal is detected, the external radar
Outputs the internal radar trigger signal instead of the trigger signal
It has an internal radar trigger signal switching output function
It has a structure that This aims to achieve the above-mentioned object.

[0007]

An embodiment of the present invention will be described below with reference to FIG. Here, the same reference numerals are used for the same components as those in the above-described conventional example. In FIG. 1, reference numeral 10 represents a random stroke type air traffic control system display device which receives an external radar trigger signal 120 and time-divisionally displays sweep data and digital data based on the external radar trigger signal 120. The input stage of the display device 10 for the air traffic control system is equipped with a trigger signal detection circuit 2 for detecting the presence / absence of the external radar trigger signal input, and an internal radar trigger signal generation circuit 1 for outputting a signal equivalent to the external radar trigger signal 120. Has been done. Further, a trigger selection circuit 3 for selectively outputting either an external radar trigger signal or an internal radar trigger signal is provided as needed.
The trigger selection circuit 3 has an internal radar trigger signal switching output function that operates immediately when the trigger signal detection circuit 2 detects an input disconnection of the external radar trigger signal and switches and outputs the internal radar trigger signal from the internal radar trigger signal generation circuit 1. ing.

The external radar trigger signal 120 input from the external radar trigger signal generation circuit 50 is
It is input to the radar trigger detection circuit 2 and the trigger selection circuit 3. In the internal radar trigger signal generation circuit 1, a signal equivalent to the external radar trigger signal is generated and input to the trigger selection circuit 3.

The radar trigger detection circuit 2 detects the presence or absence of the external radar trigger signal 120, and the result is input to the trigger selection circuit 3. In the trigger selection circuit 3, when the external radar trigger signal 120 is input, the external radar trigger signal 120 is output, and when the external radar trigger signal is no longer input, it is switched to the internal radar trigger signal and output.

The radar trigger signal output from the trigger selection circuit 33 is input to the display circuit 10 shown in FIG. 2 and processed in the conventional manner. As a result, when the external radar trigger signal is no longer input, a digital gate can be generated by the internal radar trigger signal, digital data can be displayed, and control by digital data can be continued.

[0011]

As described above, according to the present invention, when the external radar trigger signal is not input, when the external radar trigger signal is not input, the internal radar trigger signal is switched to operate. However, the digital data can be continuously displayed, and therefore, when the external radar trigger signal is transmitted wirelessly, especially in mobile air traffic control systems, etc. It is possible to provide an unprecedented excellent display device for an air traffic control system in which digital data can be continuously displayed even when it becomes impossible and air traffic control can be continuously performed without interruption.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional example.

FIG. 3 is a timing chart showing the operation of FIG.

[Explanation of symbols]

 1 Internal Radar Trigger Signal Generation Circuit 2 Radar Trigger Detection Circuit 3 Trigger Selection Circuit 10 Display Device 50 External Radar Trigger Signal Generator 120 External Radar Trigger Signal

Claims (1)

(57) [Claims] 1. A random stroke type air traffic control system display device for inputting an external radar trigger signal and displaying sweep data and digital data based on the external radar trigger signal, the trigger detecting the presence or absence of the external radar trigger signal input.
The signal detection circuit is the same as the external radar trigger signal.
Internal radar trigger signal output that outputs the radar trigger signal
Raw circuit, the external radar trigger signal and the internal radar
And a trigger selection circuit for selectively outputting any of the trigger signals
The external radar trigger signal input stage, the trigger selection circuit, the trigger signal detection circuit
If the input disconnection of the external radar trigger signal is detected,
The internal radar trigger instead of the external radar trigger signal
Internal radar trigger signal switching output function to output signals
A display device for an air traffic control system , which is characterized by being provided .