JPH01274087A - Airport surveillance radar system - Google Patents

Abstract

PURPOSE:To display the line-of-sight distances of aircraft which are changed depending on terrain features on a scope, by storing line-of-sight distance data beforehand, and outputting the stored line-of-sight distance data into a display part in synchronization with a synchronizing signal from a transceiver part. CONSTITUTION:Line-of-sight data which are obtained by computation based on terrain features, aircraft altitudes and the like beforehand are stored in a map generating part 1. Meanwhile, a transceiver part 3 transmits a radiowave into air through an antenna part 2 and outputs an angle signal 5 and a trigger signal 6 which are associated with the radio transmission to the generating part 1. The generating part 1 outputs the line-of-sight distance data which are inputted beforehand into a display part 4 as mapping signals 7 in synchronization with the angle signal and the trigger signal from the transceiver part 3. The display part 4 displays a map indicating the line-of-sight distances on a scope based on the mapping signals from the generating part 1. At the same time, echoes which are received by the transceiver part 3 are displayed on the scope of the display part 4. In this way, when the echo of the aircraft within a coverage suddenly disappears, the fact that this phenomenon is caused by the terrain feature can be recognized by the air traffic controller at a glance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an airport surveillance radar device, and particularly to an airport surveillance radar device used for air traffic control.

[Conventional technology]

ASR (Airport 5urveillanc)
Airport surveillance radar, commonly referred to as e-Radar, is installed at airports and used to monitor aircraft flying around the airport.

Incidentally, the detection distance, which is one of the most important performance characteristics of a radar, is determined by transmission power, antenna gain, receiver sensitivity, reflection cross section of an aircraft, etc. In the case of airport surveillance radar, this detection distance varies depending on the model, but the radius is approximately 50
~7ONM (nautical miles).

However, this detection distance is a distance in free space where there are no hills or mountains around the airport surveillance radar, and is actually limited by the surrounding hills or mountains. Therefore, the actual detection distance of an airport surveillance radar is determined by the performance of the radar itself and the line-of-sight distance depending on the terrain.

[Problem to be solved by the invention]

In the conventional airport surveillance radar described above, the detection distance path is determined by the performance of the radar itself and the line-of-sight distance depending on the terrain. By the way, if the terrain where the airport surveillance radar is installed is, for example, the terrain shown in Fig. 4, the line-of-sight distance due to this terrain is the installation altitude of the airport surveillance radar,
It is determined by the aircraft's flight altitude H,,82. For example, the line-of-sight distance at a flight altitude of H is a distance R, as shown in FIG. And line-of-sight distance R
After that, the aircraft cannot be detected even within the radar's own coverage area.

FIG. 3 shows an example of a scope display in an airport surveillance radar in which the detection distance is determined based on the line-of-sight distance due to terrain. As shown in Figure 3, if an aircraft echo suddenly appears at point A, moves to point B, and suddenly disappears at point B, the controller knows from experience. Aside from that, I wasn't sure if the radar performance had deteriorated or if it was a problem with visibility.

In other words, with the conventional airport surveillance radar mentioned above, the line-of-sight distance cannot be determined on the scope, so if the aircraft echo disappears even though it is within the radar coverage area, it may be because the radar performance has deteriorated or it has entered the shadow of a mountain etc. The disadvantage is that it is not clear whether it is visible or not.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such drawbacks and to provide an airport surveillance radar system that can display on a scope the line-of-sight distance of an aircraft that changes depending on the terrain.

[Means to solve the problem]

The present invention provides an airport surveillance radar device that includes a transmitting/receiving section that transmits radio waves into the air via an antenna section and receives echoes of the radio waves, and an instruction section that displays the echoes received by the transmitting/receiving section. The present invention is characterized by comprising a map generation unit that stores the line-of-sight distance data and outputs the stored line-of-sight data to the instruction unit in synchronization with a synchronization signal related to radio wave transmission from the transmitter/receiver unit. There is.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

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

This airport surveillance radar device includes an antenna section 2 and a transmitter/receiver section 3.
, an instruction section 4 , and a map generation section 1 .

In the airport monitoring radar device having such a configuration, the transmitting/receiving section 3 transmits radio waves into the air via the antenna section 2.

Then, the transmitting/receiving section 3 receives an echo, which is a reflected wave of this radio wave from the aircraft, via the antenna section 2. Also,
The transmitting/receiving section 3 outputs a synchronization signal, which is made up of an angle signal and a trigger signal, and is related to the transmission of radio waves, to the map generating section 1.

The map generating section 1 stores line-of-sight distance data inputted in advance, that is, line-of-sight distance data calculated from data such as terrain and aircraft altitude. The map generating section 1 then outputs this line-of-sight distance data inputted in advance to the instruction section 4 as a map signal in synchronization with the angle signal and trigger signal from the transmitting/receiving section 3. Furthermore, since the line-of-sight distance varies depending on the altitude of the aircraft, the map generating section 1 can specify the altitude as necessary.

The instruction section 4 includes a scope, and displays the echo received by the transmitting/receiving section 3 on this scope. At the same time, a line indicating the line-of-sight distance, that is, a map, is displayed on the scope by the map signal from the map generator 1.

Next, the operation of this embodiment will be explained.

The map generator 1 stores in advance line-of-sight distance data calculated from data such as terrain and aircraft altitude. On the other hand, the transmitting/receiving section 3 transmits radio waves into the air via the antenna section 2.

Then, the transmitting/receiving section 3 outputs an angle signal and a trigger signal related to the transmission of the radio wave to the map generating section 1. The map generating section 1 outputs line-of-sight distance data input in advance to the instruction section 4 as a map signal in synchronization with the angle signal and trigger signal from the transmitting/receiving section 3. The indicating unit 4 uses the map signal from the map generating unit 1 to generate a map 1, which is a line indicating the line of sight distance, on the scope, as shown in FIG.
01 is displayed. At the same time, on the scope of the instruction unit 4,
The echo received by the transmitting/receiving section 3 is displayed. At this time,
An aircraft echo appears at point A, moves to point B, and disappears at point B, but the controller can confirm that the aircraft echo is affected by the terrain based on the map 101, even within the radar coverage area. You can know.

Please note that line-of-sight distance varies depending on the altitude of the aircraft.
The controller can specify the altitude using the map generator 1 if necessary.

〔Effect of the invention〕

As explained above, the present invention can display the line-of-sight distance on the indicator, so if the aircraft echo suddenly disappears within the coverage area, the controller can be informed at a glance that the phenomenon is due to the terrain. .

In other words, the controller can predict the influence of terrain in advance, which is effective in reducing the load on the controller.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an example of a scope display according to the embodiment shown in FIG. 1, and FIG. 3 is an example of a scope display according to the prior art. Figure 4 is a diagram showing the relationship between flight altitude and line-of-sight distance. 1...Map generating section 2...Antenna section 3...Transmitting/receiving section 4...Instruction section Agent Patent attorney Yoshiyuki Iwasa Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) In an airport surveillance radar device comprising a transmitting/receiving section that transmits radio waves into the air via an antenna section and receives echoes of the radio waves, and an instruction section that displays the echoes received by the transmitting/receiving section, The map generation unit stores line-of-sight distance data and outputs the stored line-of-sight data to the instruction unit in synchronization with a synchronization signal related to radio wave transmission from the transmitting/receiving unit. Airport surveillance radar equipment.