JPS6252829B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display method for precision radar (PAR) used in an airport radar control system.

Conventionally, in airport radar control systems, PAR has been used to control the final approach to the runway of aircraft without an onboard ILS receiver under poor visibility. As shown in Figure 1, PAR scans the aircraft by emitting two electron beams alternately in the azimuth AZ direction and the elevation (height) EL direction. _AZ ) and elevation angle ( _θEL ). FIG. 2 shows an example of a screen of a PAR display device. In the figure, R indicates a range mark, T indicates an aircraft radar echo, and AP indicates an approach course. Aircraft that have been controlled by airport surveillance radars (ASR, SSR) are transferred to a PAR controller at about 10 nautical miles from the runway, but the ASR/SSR radar display device and PAR radar Since the screens of each display device are quite different, when there are many aircraft, it is difficult to determine which radar image displayed on the PAR display device is the aircraft about to transfer control.
Furthermore, in normal mechanical scanning PAR, the scanning range is the first
As shown in the figure, since the azimuth and elevation angles are cross-shaped, if you are controlling an aircraft that is landing in front of you and the following aircraft happens to deviate from its course, that aircraft will have a PAR of Because it is out of the scanning range and is not displayed on the PAR display device, it is impossible to know the status of the following aircraft, and when starting to control the following aircraft, the PAR's servo mechanism must be repositioned to reacquire it. However, the drawback was that it was difficult to find.
In Figures 3a and b, A is the leading aircraft under control, B' is the position where the following aircraft can be seen, φ _AZ is the elevation detection range of the horizontal scanning antenna, θ _EL is the horizontal detection range of the elevation scanning antenna, B indicates the succeeding aircraft.

The present invention attempts to solve the above-mentioned drawbacks by making it easy to see the location of a desired control aircraft on a PAR display device with the help of information from airport surveillance radars (ASR, SSR).

Recently, digital processing technology has advanced for airport surveillance radar (ASR, SSR) displays, especially
Using SSR radar, it is now possible to identify aircraft (by call sign), maintain it, and obtain aircraft altitude by responding in mode C, and display the results in alphanumeric form on the display to inform the controller. I'm offering it. Compared to this, PAR
Because the introduction of digital processing technology is expensive, air traffic controllers rely on conventional analog radar displays and voice communications to identify and control aircraft.

Therefore, if it is possible to mark a desired aircraft on the PAR display device based on digital information from airport surveillance radar, it will be possible to quickly recognize the aircraft to which control is being transferred on the PAR display device when it is crowded.
It becomes possible to early predict the position of a given aircraft that is not captured by PAR on the PAR display device. Figure 4 shows the situation, and Aircraft A is the original PARBLIP.
Immediately after that, Aircraft B is not yet captured by PAR, but if the PAR servo mechanism works, it will be there.
Immediately after the processing in which PARBLIP appears, a composite BLIP based on search radar information is generated.
(here it is slightly wider in the distance direction) is displayed.

Next, an embodiment of the present invention will be described with reference to FIG. 5 of the drawings.

The ASR data and SSR data are digitally processed by the ASR/SSR tracking device section 1. This tracking unit normally performs tracking prediction and correlation calculations each time the ASR/SSR data update cycle is 4 seconds. Based on this predicted data, the detailed predicted position calculation section 2 performs aircraft position predicted calculations every 0.5 seconds. This calculation is only performed for aircraft entering the PAR coverage area. Further, the calculation will be simpler if it is performed only for the aircraft for which the radar control transfer processing has been instructed from the ASR/SSR data processing and display system. (Restrictions on Target Aircraft) Next, the coordinate conversion calculation unit 3 converts the three-dimensional position of the specific aircraft expressed in ASR/SSR coordinates (the height of the aircraft is also known from the mode C data) into the PAR coordinate system.
The conversion to the PAR coordinate system here means ASR/
This includes correction of the positional deviation between the SSR radar site and the PAR site, and converts it to a PAR AZ system or EL system scanning antenna system.

PAR data (angle, AZ/EL scan switching signal, etc.)
Based on the above, the PAR display device timing generator 5:
Sends a signal to the PAR indicator 8 and also sends a necessary timing signal to the PAR video generator 4,
Helps generate PAR videos based on ASR/SSR data. The PAR video generation section 4 strobes and extracts the output of the coordinate transformation calculation section 3 in synchronization with the scanning AZ→EL→EL→AZ→AZ... of the PAR indicator.
In order to create an arc as a PAR blip, create a video from a location slightly shifted in both AZ and EL from the converted PAR coordinate values (the shift is also
Of course, a circuit (which is reversed by scanning from AZ to EL or EL to AZ) is built-in. Further, the output of the PAR video generating section 4 is sent to a video decompression circuit 6 to create a PAR video for displaying a composite video expanded in the distance direction as shown in FIG. The PAR video based on the ASR/SSR data thus generated is added to the original PAR video data in the video mixer 7, and is supplied to the PAR indicator 8. Here, it is assumed that the detailed predicted position calculation unit 2 makes predictions every 0.5 seconds, but this does not necessarily have to be synchronized with the PAR scan of 1 Hz. Because the original ASR/SSR data is updated every 4 seconds, the combined ASR/SSR
The PAR video data is only a reference for PAR control, and predictions every 0.5 seconds are considered sufficient.

By adopting the method of the present invention, when transferring control from the final stage of control using ASR/SSR data (referred to as feeder control or final approach) to PAR control in air traffic control, it is possible to It becomes extremely easy to quickly recognize which aircraft is the target. This is shown in Figure 4.
This is obvious if you consider that only aircraft designated from the ASR/SSR control seat are marked after the normal PAR blip.

Furthermore, when starting PAR tracking of an aircraft anew, the approximate position of the aircraft can be determined on the PAR indicator using ASR/SSR data.
This has the advantage of making PAR servo operation extremely easy. This is clear from the explanation of Aircraft B in Figure 4.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the PAR method showing antenna scanning in the horizontal and elevation directions of PAR, Figure 2 is an example of a PAR display screen, and Figures 3a and b are PAR tracking on the PAR indicator. A conceptual diagram explaining the positional relationship between an aircraft and an untracked aircraft, FIG. 4 is an example of a display on a PAR indicator based on the PAR display method according to the present invention, and FIG. 5 is a block diagram showing an embodiment of the present invention. It is. 1... Tracking device section, 2... Detail predicted position calculation section, 3... Coordinate transformation calculation section, 4... PAR video generation section, 5... Timing generation section, 6... PAR
Video decompression circuit, 7... Video mixer, 8...
PAR indicator.

Claims (1)

[Claims] 1 Convert the three-dimensional position data of the aircraft captured by the primary or secondary search radar into the desired precision radar (PAR) position coordinates, create a radar blip in synchronization with the precision radar (PAR), and A precision radar display method characterized by mixed display with survey radar video.