JPH04168389A - Accurate measurement approach control radar - Google Patents

Abstract

PURPOSE:To enable detection tracking in a mode for only tracking even for a non-mounting airplane transmitting no height information by dealing with only ASR (airport surveillance radar) data as a coordinate conversion object of the radar origin and providing a surveying signal generator. CONSTITUTION:This radar uses an electronic scanning antenna 5 and is applied by switching between an operation mode for searching and tracking, and an operation mode for only tracking. In the mode for only tracking, a coordinate converter 1 converts an aircraft data obtained by the ASR to a data on a coordinate having the origin where the radar is installed. Based on this output, a searching signal generator 2 outputs searching beam angle signals for starting tracking and continues to output changing the angle of elevation in turn until it receives a termination command. And a tracking processor 3 outputs the termination command and start tracking when the target is caught. Thus, without the data from a secondary surveillance radar in the case of including no height information, the detection tracking is possible by outputting the searching beam angle signals.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a precision approach radar that captures and tracks a target by two-dimensional scanning using an electronic scanning antenna.

(Prior technology) Precision approach radar (PAR)
ApproachRadar) is a radar used for air traffic control that controls electronic scanning antennas to perform two-dimensional scanning and capture and track targets. (Fig. 2) and a second operation mode (Fig. 3) in which only tracking is performed, which can be switched depending on the weather.

Figures 2 and 3 show the case where the number of tracking aircraft is two, but in the first operation mode, as shown in Figure 2, within one search time, the PAR coverage area is moved from the left end to the right end. While shifting the direction of the beam one by one, the pencil beam is scanned from top to bottom to evenly scan the entire coverage area.
This is a method in which tracking is performed by aiming the beam at two targets individually an appropriate number of times (three times in the example shown) within the search period.
(Track 1lhile 5search) method.

On the other hand, the second operation mode, as shown in Figure 3, deletes the search timing and allocates all the free time to tracking, increasing the number of transmitted pulse hits while maintaining the data rate for target acquisition. This is intended to improve detection performance during times of rain, etc. In this second operation mode, since there is no search mode, position information of the aircraft cannot be obtained and it is impossible to start beam tracking in this state. Therefore, conventionally, airport surveillance radar (ASR: Airport 5u) installed in the same airport as PAR was used.
rvei-Iance Radar) and secondary surveillance radar (SSR: 5eco-ndary 5urveila)
The aircraft's position information (distance, azimuth, altitude) is obtained from the radar and used as data for starting beam tracking.

(Problem to be Solved by the Invention) The second operation mode in the conventional PAR described above is S
It is assumed that aircraft altitude data can be obtained using SR mode C. 5SR) For aircraft without Mode C function in the transponder, aircraft with a malfunctioning transponder, or aircraft without a transponder (hereinafter collectively referred to as "non-equipped aircraft"),
There is a drawback that altitude information for PAR cannot be obtained and the second operation mode cannot be used.

The present invention has been made in view of such conventional problems, and its purpose is to provide a precision approach radar that can detect and track even non-equipped aircraft in the second operation mode.

(Means for Solving the Problems) In order to achieve the above object, the precision approach radar of the present invention has the following configuration.

That is, the precision approach radar of the present invention has a first operational mode in which the entire coverage area is searched and tracked using an electronic scanning antenna, and a second operational mode in which only tracking is performed, and the radar can be operated by switching between the two modes. In the precision approach radar in the second operation mode, the precision approach radar converts the aircraft data acquired by the airport surveillance radar into coordinate data whose origin is the installation position of the precision approach radar and outputs it. A coordinate transformation section;
a search signal generation unit that outputs a search beam angle signal for starting tracking in response to the output of the coordinate conversion unit, and then outputs a search beam angle signal in which the angle in the elevation direction is sequentially changed until an output stop command is received; A tracking processing section outputs a tracking beam signal upon receiving the search beam angle signal, and outputs the output stop command to start tracking when the target is captured. .

(Function) Hereinafter, the function of the precision approach radar of the present invention configured as described above will be explained.

In the present invention, since SSR data may not include altitude information, only ASR data is used, and first, the ASR data is converted into coordinate data with the origin at the installation position of the PAR in a coordinate conversion section. Then, the search signal generator outputs a search beam angle signal for starting tracking. The search beam angle signal instructs the top position of the coverage area in a certain azimuth direction, and the search beam angle signal that is output until the output stop command arrives after that indicates the beam position in the elevation direction by one point from the top position. It will indicate the lowered position one by one.

In summary, according to the precision approach radar of the present invention, in the second operation mode of only tracking, the beam can be scanned in the elevation direction at the azimuth angle based on the azimuth angle information of the ASR data, so that the altitude information It has the effect of reliably detecting and tracking even non-equipped aircraft that do not exhibit .

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a precision approach radar (second approach radar) according to an embodiment of the present invention.
Hereinafter, the sections related to the present invention will be mainly explained.

In FIG. 1, the coordinate conversion unit 1 includes installation position data and A
SR data is input. Installation location data is PAR and A
It consists of data from both SR. The ASR data consists of the distance R' to the target, the direction θAZ', and the target speed V'. The coordinate conversion unit 1 corrects the difference between the installation locations of the ASR and PAR, converts the ASR data into data (R1θ^2, ■) at the PAR installation position, and outputs the data to the search signal generation unit 2.

Note that, as is clear from the above configuration, conventionally, AS
In the present invention, the R/SSR data is converted to data at the PAR installation position and outputted to the tracking processing section 3. However, in the present invention, only the ASR data is converted, and the search signal generation section 2
is newly established, and some functions are added to the tracking processing section 3.

The search signal generation section 2 uses the direction θ input from the coordinate conversion section 1 until the search stop signal is input from the tracking processing section 3.
A search beam angle signal (θA2, θEL, ■) in which the elevation angle θEL is sequentially changed in the Az direction is output to the tracking processing section 3.

That is, the search signal generating section 2 first selects the input direction θA.
A search beam angle signal is generated specifying (θEL) wax corresponding to the upper limit elevation angle in the z direction.

The tracking processing unit 3 converts the input elevation angle (θEL) m□ into a corresponding beam number and sends it to the beam control unit 4. The beam control unit 4 forms phase data corresponding to the beam number, outputs it to the electronic scanning antenna 5, and directs the antenna beam in a predetermined azimuth angle θAz and elevation angle (θitton□).

If an aircraft at a distance R cannot be detected in this beam direction and a search stop signal is not sent from the tracking processing unit 3, the search signal generation unit 2 detects (θE
L) Generate an elevation signal that is one position lower in the elevation direction from □8 and cause the antenna to emit a beam in that direction.

Thereafter, the elevation angle position is lowered one by one until the target aircraft signal can be received at the distance R. Repeat the cycle.

When the target aircraft is captured, the tracking processing section 3 generates a search stop signal, stops the search signal generation section 2 from outputting the search beam angle signal, and starts tracking by the tracking processing section 3 itself.

The target velocity V is used to predict the next beam position at the start of tracking, but in the subsequent tracking process, tracking is continued using the velocity calculated by PAR itself.

(Effects of the Invention) As explained above, according to the precision approach radar of the present invention, in the second operation mode of only tracking, the beam is scanned in the elevation direction at the azimuth angle based on the azimuth angle information of the ASR data. This makes it possible to reliably detect and track even non-equipped aircraft that do not display altitude information.

[Brief explanation of drawings]

FIG. 1 shows a precision approach radar (second approach radar) according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of the beam control method in the first operation mode, and FIG. 3 is an explanatory diagram of the beam control method in the second operation mode. 1... Coordinate conversion unit, 2... Search signal generation unit, 3... Tracking processing unit, 4...
Beam i control unit, 5...Electronic scanning antenna. Agent Patent Attorney Yoshi Yahata Hiroshi Hiroshi Hu's skin is in full swing (24 years old)'s bravery 19
Leaf L Figure Kaya/α Haruyou-Y's beam vice test 2nd flash AR 2nd 1 use-) (beam control method dog

Claims (1)

[Claims] In a precision approach radar that has a first operational mode that searches and tracks the entire coverage area using an electronically scanned antenna and a second operational mode that performs only tracking, and operates by switching between both modes; The precision approach radar in the mode includes a coordinate conversion unit that converts the aircraft data acquired by the airport surveillance radar into coordinate data whose origin is the installation position of the precision approach radar and outputs the data; an output of the coordinate conversion unit; a search signal generating section that outputs a search beam angle signal for starting tracking in response to a search beam angle signal and then outputs a search beam angle signal whose angle in an elevation direction is sequentially changed until receiving an output stop command; A tracking processing unit that outputs a tracking beam signal upon receiving the target, and outputs the output stop command to start tracking when the target is captured.