JPH03115886A - Precision approach radar - Google Patents

Abstract

PURPOSE:To execute beam tracking of an airplane by an operation mode only for tracking and to improve a search performance of PAR by inputting a height information on an airplane obtained separately even when there is no height information thereon from a transponder. CONSTITUTION:When position data from ASR are inputted to a coordinate conversion element 2, the coordinate conversion element 2 compares the data from the ASR with installation position data on the place of installation of PAR for correction and converts the data from the ASR into position data wherein the PAR is taken as the origin. Receiving the position data as an input, an integrating element 4 integrates them with height information data (height H) from a height information input element 6 and delivers the integrated data to a data converter element 8. A tracking processing element 10 determines a beam number showing an antenna beam, which is sent from the data converter element 8, and outputs it to a beam control element 14. The beam control element 14 starts tracking in the direction of a target corresponding to the beam number from the tracking processing element 10. A radio wave for tracking is displayed in a display element 12 through the tracking processing element.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a precision approach radar (Prec) used for air traffic control.
ision Approach Radar ;Hereafter P
Regarding AR), especially secondary surveillance radar (Second Surveillance Radar)
dary 5urvet11ance Radar;
This invention relates to a precision approach radar that can capture and track a target by two-dimensional electronic scanning even without altitude information from the SSR (hereinafter referred to as SSR).

[Conventional technology]

PAR has a plurality of operation modes, and these operation modes are switched depending on the weather and other conditions.

Examples of two of these operation modes are shown in the second example.
As shown in Fig. 3.

The first operation mode is TWS (Trac) in PAR.
k While 5 search) mode,
This method performs beam tracking of a specific target while searching for the target within a limited search plane using a pencil beam in a predetermined scanning order. FIG. 2 shows beam scanning and time allocation in this method.

In this method, during the search time (search data rate),
No, 1 to No, search for n, tracking of targets A and B, No
, Search for n+1~No, 2n, Track targets A and B, N
o, 2n+1 = No, 3n search, target A, B
In the following tracking order, beam tracking scanning is performed three times for each of the two targets A and B. Further, tracking of targets A and B, No., n+1 to No., 2n are tracking data rates. The second operation mode is a mode for improving detection performance in times of rain, etc., and as shown in the tracking-only beam scanning and time allocation in Figure 3, the number of transmitted pulses is increased to improve detection performance. I'm letting you do it. In this operation mode, while maintaining the tracking data rate for target acquisition, the search timing is deleted for the purpose of increasing the number of transmitted pulse hits, and all the free time is spent searching for target A,
It is assigned to tracking B. However, in the second operation mode, the search timing is removed, so
There is no position information of the aircraft, and beam tracking cannot be started in this state. Therefore, conventional precision approach radars provide aircraft position information (distance, azimuth, etc.).

altitude) and the airport surveillance radar (Airport 5 surveillance radar) in the same airport where PAR is installed.
Radar (hereinafter referred to as ASR) was manually input from the SSR and used as data to start beam tracking.

[Problem to be solved by the invention]

In the second operation mode in the conventional PAR, acquiring aircraft position information from the SSR is a prerequisite for starting beam tracking. However, because the transponder does not have a mode function, aircraft cannot transmit altitude information to the SSR.

Aircraft with a malfunctioning transponder and aircraft without a transponder (hereinafter collectively referred to as non-equipped aircraft)
, because the aircraft's transponder cannot transmit the aircraft's altitude information to the SSR, the PAR is
Unable to obtain aircraft position information from SR, therefore PAR
The second mode of operation of was disabled.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such drawbacks and provide a precision approach radar (PAR) that can use the second operational mode even without altitude information of the aircraft from a transponder.

[Means to solve the problem]

The present invention provides a precision approach radar that includes a beam control section that controls an antenna that beam-tracks an aircraft, and a tracking processing section that obtains position data of the antenna from azimuth data and elevation data and sends it to the beam control section. a coordinate conversion unit that converts the two-dimensional position information data of the aircraft from the airport surveillance radar into coordinates having the precision approach radar as the origin and sends out the coordinate conversion data; an altitude information input section that outputs separately obtained altitude information of the aircraft as the altitude information data; The apparatus is characterized by comprising a data conversion section that obtains the azimuth angle data and the elevation angle data necessary for controlling the control section and sends them to the tracking processing section.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram showing one embodiment of the present invention. This PAR includes a coordinate conversion section 2, a synthesis section 4, an altitude information input section 6, a data conversion section 8, a tracking processing section 10, a display section 12, a beam control section 14, a reception section 16,
It includes a transmitting section 18, a transmitting/receiving switching section 20, and an antenna 22.

The coordinate conversion unit 2 inputs two-dimensional aircraft position data from the ASR, such as distance and direction data to the target aircraft, and compares these data with installation position data of the PAR installation location. Correct the difference in the installation position of ASR and convert it into data with PAR as the origin,
Send it to the general department 4.

The synthesis section 4 synthesizes the data from the coordinate conversion section 2 and the altitude information data from the altitude information input section 6, and converts the data into three-dimensional position information (distance, azimuth, altitude) of the aircraft into the data conversion section 8.
Send to.

The altitude information input unit 6 inputs the altitude information of the aircraft separately obtained from the pilot without using the altitude information of the aircraft from the SSR by the transponder, and sends it to the synthesis unit 4. With this altitude information, detection and tracking of the target aircraft can be started in a tracking-only operation mode even without altitude information from the SSR.

The data conversion section 8 calculates the elevation angle from the distance and altitude of the three-dimensional position information of the aircraft from the synthesis section 4, and sends these data together with the azimuth angle to the tracking processing section 10.

The tracking processing section 10 obtains a beam number indicating the position of the antenna from the azimuth angle and elevation angle data from the data conversion section 8 and sends it to the beam control section 14 . It also sends out the received data from the receiving section 16 to the display section 12. The display section 12 displays the received data from the tracking processing section 10 on a display or the like. The beam control section 14 sends antenna phase shift data corresponding to the beam number from the tracking processing section 10 to the antenna 22 for control. Antenna 22 directs the antenna beam in the direction of the target aircraft corresponding to the phase shift data from beam controller 14 .

The receiving section 16 and the transmitting section 18 share the antenna 22 by switching with the transmitting/receiving switching section 20 to transmit and receive radio waves.

Next, the operation of this embodiment will be explained. When detecting and tracking PAR in tracking-only operation mode, position data from ASR (distance Rl to target aircraft, azimuth θA2
') is input to the coordinate conversion unit 2, the coordinate conversion unit 2 compares and corrects the data from the ASR and the installation position data of the PAR installation location, and converts the data from the ASR into the PAR.
is converted into position data (distance R2 azimuth θA□) with the origin as the origin.
When inputting 2), the altitude information data (altitude H) from the altitude information input unit 6 is integrated to create three-dimensional position information data of the aircraft (distance R2 azimuth θ□, altitude H), and then data conversion is performed. Send it to Section 8. Here, regarding the altitude information data from the altitude information input unit 6, since aircraft are equipped with equipment such as a barometric altimeter or radio altimeter to grasp the altitude of the aircraft due to aviation needs, the altitude information data is input from this equipment. The obtained altitude information is obtained by obtaining the altitude information from the pilot through radio communication, etc., and inputting it from the altitude information input section 6.

Next, the data conversion unit 8 converts the elevation angle θ from the distance R and altitude H to the target aircraft out of the three-dimensional position information data of the aircraft from the synthesis unit 4. is determined and output to the tracking processing section 10 along with the azimuth θA2. The tracking processing unit 10 obtains a beam number indicating the antenna beam from the data conversion unit 8 and outputs it to the beam control unit 14.
A phase shift code for the antenna 22 corresponding to the beam number starting from 0 is generated and sent to the antenna 22. The antenna 22 starts tracking the antenna beam in the direction of the predicted target based on the phase shift code from the beam r&IJ controller 14. The tracking radio waves are antenna 22. It is received by the receiving unit 16 via the transmission/reception switching unit 20 and sent to the display unit 1 via the tracking processing unit 10.
2 will be displayed.

As explained above, in the tracking-only operation mode, the precision approach radar of the present invention can start beam tracking using the altitude information separately obtained from the pilot, without changing to the altitude information from the SSR. This is also valid for on-board aircraft.

〔Effect of the invention〕

As explained above, when the present invention is used in a tracking-only operation mode, even if there is no altitude information of the aircraft from the transponder, by inputting separately obtained altitude information, the aircraft can be operated in the tracking-only operation mode. beam tracking, which has the effect of improving PAR detection performance.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention, FIG. 2 is a diagram explaining a first operation mode showing an example of the conventional technology, and FIG. 3 is a diagram following FIG. 2. It is a figure explaining the 2nd operation mode. 2... Coordinate conversion unit 4, 6, 8, 10, 14, 22, - General unit, altitude information input unit, data conversion unit, tracking processing unit, beam control unit, antenna

Claims (1)

[Claims] (1) In a precision approach radar comprising a beam control section that controls an antenna that beam-tracks an aircraft, and a tracking processing section that obtains position data of the antenna from azimuth data and elevation data and sends it to the beam control section. , a coordinate conversion unit that converts the two-dimensional position information data of the aircraft from the airport surveillance radar into coordinates with the precision approach radar as the origin and sends out the coordinate conversion data; a synthesis unit that obtains three-dimensional position information data by integrating the altitude information data; an altitude information input unit that sends separately obtained aircraft altitude information as the altitude information data; and a beam control unit that uses the three-dimensional position information data. A precision measurement approach radar, comprising: a data conversion section that obtains the azimuth angle data and the elevation angle data necessary for controlling the azimuth angle data and sends the data to the tracking processing section.