JPS61205003A - Antenna system - Google Patents

Abstract

PURPOSE:To obtain a compact and lightweight antenna system which can correct the rock of a ship by controlling the radiated beams in the high-low direction with high-low revolutions of a reflecting plate while an antenna radiation system kept fixed to the ship. CONSTITUTION:The radio waves radiated from a primary radiation antenna 101 are reflected in the direction A by a flat reflecting plate 102 set at the position (1). The antenna beam direction is directed as if the line 101 were set at the position (a). Then a drive controller 205 calculates the sloping angle phiof the direction theta from the directed position theta of the line 101 and pitching and rolling angles P and R produced by the rock of a ship. Then the reflector 102 is turned via phi/2 from the position (1) and set at the position (2) by a rotation mechanism 104 for reflector 102 so that the sloping angle phi is corrected. Thus the antenna beam is corrected from the direction A by and directed toward B. This can correct the sloping angle owing to the rock of the ship.

Description

Detailed Description of the Invention (Technical Field) The present invention corrects errors in elevation angle and azimuth angle due to the tilt of the face of the moving body in a directional antenna that is mounted on a moving body and directs a single beam in a predetermined direction. The present invention relates to an antenna device.

(Prior Art) Conventionally, the oscillation correction of this comb antenna device involves mounting the entire antenna device on a stabilizer that has a mechanism that receives the inclination angle due to the oscillation of the ship body from an external device and is driven to correct this angle. This corrected the ship's motion.

(Problems to be Solved by the Invention) In this type of oscillation correction method, it is impossible to keep the transmission line of the radio wave and other lines leading to the antenna constant with respect to the ship's hull. In addition, it was necessary to provide an electric power transmitter to transmit power between the movable part and the fixed part, and to mount the wave generating part of the high cylindrical wave on the movable part. Because of this, the antenna system, together with the stabilizer, is not only complicated and expensive, but also large and heavy, which is a major drawback when mounted on the high part of a ship. Other examples of antenna sway correction There is also a method of using an electronic scanning antenna and electronically scanning the direction of the radiation beam based on information about the movement of the ship, but this method has the drawback that the 11-element scanning antenna is extremely complex and expensive. was.

The present invention eliminates such drawbacks and controls the radiation beam in the height direction by rotating the reflector in the height direction while the antenna radiation system is fixed to the ship's hull, thereby controlling the ship's motion using a small, simple, and lightweight mechanism. The present invention provides an antenna device that corrects for.

(Means for Solving the Problems) The oscillation-correcting antenna device of the present invention has a radiator mounted on a oscillating body, a flat reflector, and the flat reflector aligned along a predetermined axis or FiZ axis substantially on a reflecting surface. It is composed of a rotation mechanism that rotates the rotating mechanism, and a drive controller that receives a vibration angle signal from the vibration body and generates a drive signal for the rotation mechanism, and rotates the reflecting mirror in response to the vibration angle signal from the vibration body. By rotating the trap around the predetermined axis, a directional radiation beam is directed in a predetermined direction to correct the oscillation.

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

FIG. 2 shows the relationship between the inclination angle of the deck surface caused by the movement of the ship and the difference angle of the azimuth when pointing in a high elevation angle direction.

In FIG. 2, the inclination angle φ of the deck surface in the 0 direction is expressed by the following equation.

φ=Rsinθ−Pcnsθ (1) Also, the azimuth error Δθ is approximated by the following equation.

△φ=t3nθm tan (Ps inθ+R+co
sθ) (2) The present invention calculates the φ angle and Δ using equations (1) and (2) based on the pitching angle (8, rolling angle (R), antenna beam direction azimuth (θ), and target elevation angle (θ). The θ angle is calculated, and based on this, the inclination angle φ and the azimuth angle error Δθ are corrected with a simple structure.

FIG. 1 shows a first embodiment according to the invention.

In Fig. 1, 201#i-th radiant median line, 202 is the flat plate reflection value, and ZO3 is the fulcrum 52 of the flat plate reflector (202).
04 is a flat reflector rotation mechanism and a 205 drive controller.

The radio waves radiated from the primary radiation antenna (201) are reflected in the direction of A from the flat plate reflection * (202) K at position ■, and the antenna is reflected as if the -order radiation central line was at position a. The beam direction is directed.

At the same time, the drive controller 205 determines the antenna pointing direction (θ), the pitching angle (T) due to the ship's vibration, and the O-ring angle (I).
Upon receiving the smell, the flat reflector-transfer IA structure (204) is operated to calculate the inclination angle φ in the θ direction and correct this inclination angle based on this, and the flat reflector (202) is moved from the position of ■ to φ. Rotate it by /2 and set it to &. As a result, the antenna beam is corrected by φ from the person and directed in the direction B, making it possible to just correct the angle of inclination caused by the movement of the ship.

The first embodiment is effective in the case where ΔθFi is an extremely small value and can be ignored in a device that targets a low elevation angle target because θ is a low angle.

Figure gA3 shows a second embodiment of correcting the elevation and azimuth angles according to the present invention.

As shown in FIG. 2, when the elevation angle of the target is large, the azimuth error becomes large in addition to the elevation angle error due to the inclination of the deck surface.

When the elevation angle of the target is θ on the horizontal plane map, the aerial image beam, which was directly facing two points when the deck plane was horizontal, is directed in the direction of point b due to the slope of the plane.

As a result, an ia difference of Δθ occurs in the azimuth direction, so it is necessary to correct this. Δθ is expressed by the above equation (2).

In FIG. 3, 201 to 205 are the same as the first example shown in FIG. Mirror horizontal rotation mechanism and 303#: I-vertical drive controller.

In this configuration, the correction of the elevation angle is the same as the explanation with reference to FIG. (Based on (b), calculate the correction amount △θ using equation (2). Based on this, the vertical rotation mechanism (30
2) moves the flat reflector (202) by △θ/2 to the fulcrum (3
By using the patented motion control characterized by 01), it is possible to correct the heel angle caused by the motion of the ship over two dimensions.

(Effects of the Invention) As explained above, the present invention allows the antenna beam to always be directed in a predetermined direction by simply changing the #t$1 angle of the flat reflector, even though the antenna beam has a pointing direction error caused by the motion of the ship. Compared to the conventional method, the primary broadside system can be fixed to the hull, and it has the effect of being extremely simple, compact, lightweight, and inexpensive.

In addition, in the embodiment of the present invention, the vibration correction by pitching and rolling was explained when installed on a ship, but the use of the antenna device according to the present invention is not limited to ships, and the antenna device according to the present invention is installed on a vehicle, etc. All are available for those whose pace is unsettling.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the composition of the first embodiment of the present invention, and Fig. 2 is a diagram showing the relationship between the heel angle of the deck surface at about 1 and the azimuth error of the elevation target based on the heel of the hull at about 1. , FIG. 3 is a block diagram showing the second embodiment. 101...-Next radiation aerial proboscis, 102...
Flat reflector, 103.301... Fulcrum of the flat reflector, 104.302... Flat reflector rotation mechanism,
105°303... Drive controller. Agent Patent Attorney Otoko Uchihara 1st Ward

Claims (1)

[Claims] A radiator mounted on the shaking body, a flat reflecting mirror, a rotation mechanism for rotating the flat reflecting mirror around one or more predetermined axes substantially on the reflecting surface, and inputting a shaking angle signal from the shaking body. and a drive controller that generates a drive signal for the rotation mechanism, and rotates the reflecting mirror around the predetermined axis in response to the swing angle signal from the swing body, thereby directing the directional radiation beam to a predetermined direction. A sway correction antenna device characterized in that it corrects the sway by directing the antenna in a certain direction.