JPH01197685A - Synchronous rotation system for plural nearby antennas - Google Patents

Abstract

PURPOSE:To obtain the synchronous rotation system for the nearby antennas by providing antenna controllers which controls servomotors for rotating the antennas and providing a means which controls one of the two antenna controllers. CONSTITUTION:An angle instruction generator 7 generates an angle signal synchronized with the rotation of the antennas 5a and 5b of a radar and supplies angle instructions 6a and 6b to the antenna controllers 1a and 1b. Then respective airport detection radars ASDE receive the instructions 6a and 6b and rotate the antennas 5a and 5b of the radar synchronously. Here, the controllers 1a and 1b and antennas 5a and 5b form servo loops and hardly have errors between the instructions 6a and 6b and the actual angles of the antennas 5a and 5b. Therefore, the antennas are rotated synchronously as long as the generator 7 generates the synchronous angle instructions. Then even when there are >=3 angle instructions, the phase difference of the signals generated by the generator 7 is selected properly and even at the time of an ASDE and other radars, the rotating speed and phase difference of the signals are selected properly to preclude mutual disturbance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a synchronized rotation system for a plurality of adjacent antennas of a radar.

[Conventional technology]

Conventional airport surface detection radar (hereinafter abbreviated as ASDE)
An example of the rotation control system of the antenna system is shown in FIG. 3 and will be explained.

In the figure, 11a and 11b are antenna starters, 12
a.

12b is a control signal generated by the antenna starters 11a and 11b, respectively; 13m and 13b are induction motors that start rotating according to the control signals 12m and 12bK, respectively; and 14a*14b are the motive power of the induction motors 13a and 13b, respectively. the radar antenna 15a,
15b.

Next, the operation will be explained. In addition, in this figure 3, 2
Two A30Es are shown, but since they operate in exactly the same way, only one will be explained.

To operate the A8DK, first connect the radar antenna 5a.
must be rotated. Therefore, first, the antenna starter 11a is operated, and the control signal 121 (induction motor 13
generate power (power supply to m).

Next, in response to this control signal 12a (power supply), the induction motor 13a starts rotating and rotates the radar antenna 15m via the drive shaft 14m.

[Problem to be solved by the invention]

In the conventional ASDE antenna system as described above, an induction motor was used, so synchronous rotation was impossible. There was no problem when a single AsDE was installed, but when multiple AsDEs were installed in close proximity, the antennas were not synchronized and sometimes faced each other directly. There were issues such as causing interference to other parties.

The present invention was made to solve this problem, and an object of the present invention is to provide a synchronized rotation system for a plurality of adjacent antennas that do not interfere with each other even when a plurality of ASDEs are installed close to each other.

[Means to solve the problem]

The synchronized rotation method of a plurality of adjacent antennas according to the present invention each has a servo motor for rotating the antennas and an antenna control device for controlling the servo motor, and means for controlling at least one of the antenna control devices. It is something to be prepared for.

[Effect]

In this invention, a plurality of antennas are rotated synchronously.

〔Example〕

FIG. 1 is a system diagram showing an embodiment of the synchronous rotation system of a plurality of adjacent antennas according to the present invention.

In the figure, 1 a r 1b is an antenna control device that controls a servo motor which will be described later, 2a and 2b are control signals, and 3
a, 3b are servo motors that rotate the antenna, 4m, 4
b is a drive shaft that transmits power to the radar antennas 5a and 5b, respectively; 6a and 6b are angle commands for controlling the antenna control devices Ia and 1b; and 7 is the angle command 6m and 6b.
't - Generate angle command generator.

This angle command generator 7 includes an antenna control device 1m,
1b.

Next, the operation of the embodiment shown in FIG. 4 will be explained.

First, the angle command generator 7 is a radar antenna of 5 m.

5b generates an angle signal synchronized with the rotation of the two AS
Angle commands 6a and 6b are given to DE, that is, antenna control devices 1a and 1b, respectively. Next, each AS
In response to the angle commands 6a and 6b, the DK performs synchronous rotation of the radar antennas 5m and 5b. Here, the antenna control device ii 1a, 1b or radar antenna 5a,
5b is designed to form a servo loop, and there is almost no error between the angle commands 6m, 6b and the actual angles of the radar antennas 5a, 5b. Therefore, as long as the angle command generator T generates synchronized angle commands, synchronous rotation of the antenna will occur.

Now, consider the signals generated by the angle command generator 7, that is, the angle commands 6m and 6b.

Since the antennas 5a and 5b of the two radars have the same rotation speed, the angle commands 6a and 6b are signals having the same adduction speed and different phase differences. For the purpose of preventing ASDEs from interfering with each other, a phase difference of, for example, 9000 may be provided. Even when there are three or more ASDKs, by appropriately selecting the phase difference between the signals generated by the angle command generator 7, the adduction speed and phase difference of the signals can be adjusted appropriately even when there are human SDEs and other radars. Mutual interference can be prevented by selecting .

In the above embodiment, two ASs are output from the angle command generator 7.
A signal was supplied to the DI, but in this example, one AS
By giving a certain phase difference to the antenna angle signal of DK, other AS
It may also be supplied to DK. In this case, the angle command generator 7 is not required, and the configuration of the device becomes somewhat simpler. Figure 2 shows the system diagram.

FIG. 2 is a system diagram showing another embodiment of the present invention.

In FIG. 2, the same reference numerals as in FIG. 1 indicate corresponding parts, 8 is an angle adder, and 9 is an angle signal.

The angle adder 8 constitutes means for controlling the antenna control device 1b.

[Effects of the Invention] As described above, the present invention has the effect that by performing synchronized rotation of a plurality of antennas, mutual interference of human SDI can be removed and an accurate radar system can be constructed.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an embodiment of the synchronized rotation system of multiple adjacent antennas according to the present invention, Fig. 2 is a system diagram showing another embodiment of the invention, and Fig. 3 is a system diagram showing a conventional ASDK antenna. FIG. 2 is a system diagram showing an example of a rotation control system of the system. 1m, 1b... Antenna control device, 3m, 3b...
...Servo motor, 5a, 5b - battle...Radar antenna, 6a, 6b...Angle command, 7...Angle command generator, 8...Angle adder.

Claims (1)

[Claims] A method for controlling a plurality of adjacent antennas, each of which has a servo motor for rotating the antenna, and an antenna control device for controlling the servo motor, and means for controlling at least one of the antenna control devices. Synchronous rotation method.