JP2635659B2 - Reflector antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to, for example, a two-piece reflector antenna device suitable for mounting on an artificial satellite.

(Related Art) In general, when transmitting and receiving radio waves to and from an artificial satellite or the like, a reflector antenna device rotates an antenna body including an antenna feed unit by a rotation driving mechanism, and controls its directivity.

By the way, in such a reflector type antenna device, a large inertia load of the antenna body must be rotated at a large acceleration during the pointing control, so that a very large reaction force is applied. Therefore, the reflector itself and the antenna support structure are formed to have high rigidity. As a result, a rotary drive mechanism that rotates the antenna body is provided with a performance having a large output torque.

However, in the above reflector antenna device, when mounted on a spacecraft such as an artificial satellite, there is a possibility that the attitude of the artificial satellite may be disturbed due to recoil at the time of directivity control, and the rigidity of the antenna support structure and the like must be high. Therefore, the weight is promoted, so that mounting is difficult.

Therefore, it is conceivable to use a two-reflector reflector antenna device in which the reflector is divided into two main reflectors and a sub-reflector, and only the sub-reflector is used for directivity control. Such a two-piece reflector antenna device requires only a small inertial load during directivity control, and therefore has a small reaction force. Therefore, the reflector itself and the antenna support structure are formed with low rigidity. Is possible, and its rotary drive mechanism is
This is because a small output torque is sufficient.

However, in the two-reflector reflector antenna device, since the variable angle of the directivity direction is narrower than that of a system in which the antenna body is rotationally driven due to its configuration, it is not suitable for directivity control over a wide range. Had.

(Problems to be Solved by the Invention) As described above, the conventional reflector antenna device has a large inertial load and is heavy,
Due to its narrow pointing range, it is not suitable for mounting on space vehicles such as artificial satellites.

The present invention has been made in view of the above circumstances, and it is possible to reduce the inertial load at the time of directional control, to reduce the weight, and to realize directional control as wide as possible. It is an object of the present invention to provide a reflecting mirror antenna device.

[Constitution of the Invention] (Means for Solving the Problems) The present invention relates to a first rotary drive mechanism for rotating an antenna having a sub-reflector disposed opposite to a main reflector to set a directional direction. A second rotation drive mechanism that rotationally drives the sub-reflector to set a directivity direction, and a tracking reception unit that is connected to an antenna feed unit and receives an electric wave from a directivity target to detect an antenna directivity error; The first and second rotary drive mechanisms are driven and controlled in response to the pointing error signal detected by the tracking receiving means, and the first rotary drive mechanism is controlled to be lower than the second rotary drive mechanism. And control means for performing drive control in a band.

(Operation) According to the above configuration, the sub-reflector having a small moment of inertia is driven with high responsiveness by the second rotation driving mechanism, and the antenna including the main and sub-reflectors having the large moment of inertia is the first rotation driving mechanism. Drive control is performed with lower responsiveness. As a result, the power consumption is reduced as compared with the power consumption of the rotary driving mechanism in the conventional reflector antenna device, the driving torque is reduced, and the reaction force to the antenna support structure is reduced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a reflector antenna device according to an embodiment of the present invention. For example, a support 10 attached to a satellite body is formed in a concave shape with a reinforcing fiber plastic such as CFRP. The main reflector 11 is rotatably supported via a first rotation drive mechanism 12 for directivity control. The first rotary drive mechanism 12 includes, for example, a drive motor and a reduction mechanism in an azimuth-elevation system (see FIG. 2A) or an XY system (see FIG. 2B). To change the direction of the antenna in a wide range. The main reflecting mirror 11 is provided with an antenna feed unit 13 at a substantially central portion thereof.
For example, a tracking receiver 14 for pointing error detection of a higher-order mode system or a multi-horn system is provided. A supporting member 15 is attached to the main reflecting mirror 11, and a sub-reflecting mirror 16 is rotatably supported on the supporting member 15 via a second rotation driving mechanism 17 for directivity control. This second rotation drive mechanism 17
As shown in FIG. 3, a yoke 17b is rotatably disposed around a Y-axis via a shaft 17c in a housing 17a attached to the support member 15. In the yoke 17b, a mounting member 17d supporting the sub-reflecting mirror 16 is disposed via a shaft 17e so as to be rotatable around the X axis. The displacement amount of each of the yoke 17b and the mounting member 17d is detected by the displacement sensor 17f, and the displacement amount is determined via the actuator 17g.
The directional control of the sub-reflection mirror 16 is changed by rotation control about the axis and the X-axis.

Further, a drive control device 18 is connected to the first and second rotary drive mechanisms 12 and 17. For example, as shown in FIG. 4, the drive control device 18 generates a pointing error signal by a subtractor 19 from the target angle Θd and the antenna pointing direction angle Θ, and the pointing error signal is guided to the tracking receiver 14. . The tracking receiver 14 generates a deviation signal in the pointing direction from the pointing error signal, and has a first output terminal connected to the first rotation drive mechanism 12.
A first drive control unit 20 for controlling the drive of the motor is connected, and a second output terminal thereof is connected to a second drive control unit 21 for controlling the drive of the second rotation drive mechanism 17. This first
And the second drive control units 20 and 21 are for controlling the drive of the first and second rotary drive mechanisms 12 and 17 in the direction of decreasing the deviation of the deviation signal, of which the antenna from the first drive control unit 20 is provided. The driving angle is set to such an extent that it can be driven to a value less than the value that allows directivity control by driving the sub-reflecting mirror based on the information of the deviation signal of the directing direction, and the driving angle of the sub-reflecting mirror from the other second drive control unit 21 is high It is set to be able to follow in response. That is, the first
The drive control unit 20 is set so as to control the drive of the control band of the first rotary drive mechanism 12 in a band lower than the control band of the second rotary drive mechanism 17 by the second drive control unit 21.

In the above configuration, the drive controller 18 generates an antenna drive angle signal and a sub-reflector mirror drive angle signal in the first and second drive controllers 20 and 21 according to the pointing error signal detected by the tracking receiver 14. Then, the first and second rotation drive mechanisms 12, 17 are drive-controlled. The first drive control unit 20 controls the drive of the first rotary drive mechanism 12 in a control band lower than that of the second rotary drive mechanism 17, and the other second drive control unit 21 controls the second rotary drive mechanism. The drive of the mechanism 17 is controlled in a higher control band than that of the first rotary drive mechanism 12. Thus, the main reflecting mirror 11 including the sub-reflecting mirror 16 is driven and controlled with low response, and
Only 16 is driven and controlled with high responsiveness to control the antenna directional angle Θ. This antenna pointing direction angle Θ is physically determined by the drive angle of the first drive control unit 20 and the second drive control unit 21.
Is obtained by adding a value obtained by multiplying the drive angle by the directivity change characteristic.

As described above, the reflector antenna device is
A first rotary drive mechanism 12 for driving a main reflecting mirror 11 including a mirror to control a directivity direction, and a second rotary drive mechanism 17 for driving a sub-reflector 16 to rotate and set a directivity direction. In response to a pointing error signal from a tracking receiver 14 that receives an electric wave from the target and detects an antenna pointing error, the first rotary drive mechanism 12 is driven and controlled in a lower control band than the second rotary drive mechanism 17 in response to a pointing error signal. It was configured as follows. According to this, the sub-reflector 16 having a small moment of inertia is driven with high responsiveness by the second rotation driving mechanism 17, and the main reflection mirror 11 including the sub-reflection mirror 16 having a large moment of inertia is moved to the first rotation driving mechanism. Drive control is performed with a lower responsiveness than in 12, and quick pointing control is realized. As a result, as compared with the power consumption of the rotary drive mechanism in the conventional reflector antenna device, the total power consumption is reduced, the driving torque is reduced, and the inertia load is reduced, thereby realizing the antenna support structure. As a result, the reaction force is reduced, and a wider range of directivity than the conventional two-mirror reflector antenna device is realized, so that it can be mounted on an artificial satellite as much as possible.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[Effects of the Invention] As described above in detail, according to the present invention, it is possible to reduce the inertial load during the directional control and to reduce the weight,
In addition, it is possible to provide a reflector antenna device capable of realizing directivity control in a range as wide as possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a reflector antenna device according to an embodiment of the present invention, FIG. 2 is a diagram showing a first rotary drive mechanism of FIG. 1 taken out, and FIG. FIG. 4 is a block diagram showing the drive control device of FIG. 1 taken out and shown. 10 ... support, 11 ... main reflecting mirror, 12 ... first rotary drive mechanism, 13 ... antenna feeder, 14 ... tracking receiver, 15 ...
... Support member, 16... Sub-reflector, 17... Second rotational drive mechanism, 18... Drive control device, 19... Subtractor, 20... First drive control unit, 21. Drive control unit, 22 ... directional change characteristics.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaki Tanaka 1 Koga Toshiba-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Toshiba Komukai Plant (56) References Kaisho 61-82503 (JP, A)

Claims (1)

(57) [Claims] A first rotary drive mechanism for rotating an antenna having a sub-reflector disposed opposite to a main reflector to set a directivity direction; A second rotary drive mechanism for setting a direction, a tracking receiving means connected to the antenna feeder for receiving a radio wave from a pointing target and detecting an antenna pointing error, and responding to a pointing error signal detected by the tracking receiving means And control means for controlling the drive of the first and second rotary drive mechanisms, and for controlling the drive of the first rotary drive mechanism in a control band lower than that of the second rotary drive mechanism. Characteristic reflector antenna device.