Beam antenna device

Abstract

The objective is to provide a beam antenna device that can perform beam tracking for a flight squadron circling in the air, even if it cannot rotate permanently in the pan direction. [Solution] In a communication system, the beam antenna device comprises 1 a flat plate portion 10, a first rotating body 12 that rotates about a first axis 21 perpendicular to the flat plate portion but does not rotate permanently relative to the flat plate portion, a second rotating body 14 that rotates about a second axis 23 perpendicular to the first axis, a planar antenna 16 that is perpendicular to the second axis, is provided on the second rotating body and directs its antenna directivity 30 toward a fixed direction when viewed from the second rotating body, and a control unit that controls the rotation of the first and second rotating bodies, and the flat plate portion is installed at a predetermined angle Θ inclined with respect to the horizontal line 41.

Claims

1. A flat plate section, A first rotating body that rotates with a first axis perpendicular to the flat plate portion as its axis of rotation, the first rotating body that does not rotate permanently relative to the flat plate portion, A second rotating body having a second axis perpendicular to the first axis as its axis of rotation, An antenna positioned perpendicular to the second axis, mounted on the second rotating body, and having its antenna directivity directed toward the fixed direction as viewed from the second rotating body, A control unit that controls the rotation of the first rotating body and the second rotating body, Equipped with, The flat plate portion is installed at a predetermined angle relative to the horizontal plane. Beam antenna device.

2. The beam antenna device directs its antenna direction toward an aircraft orbiting in the sky. The beam antenna device according to feature 1.

3. The aforementioned aircraft is a HAPS (High Altitude Platform Station). The beam antenna device according to feature 2.

4. The beam antenna device is installed within the range vertically below the swivel circle around which the HAPS rotates. The beam antenna device according to feature 3.

5. The installation angle of the beam antenna device is (θ, ψ azimuth )year, θ is the angle of the flat plate portion with respect to the horizontal plane, ψ azimuth Let be the rotation angle from true north, where the reference direction of the flat plate on the horizontal plane points, with true north being 0 degrees in azimuth. The limit angle of tilt is θ tilt_max , the limiting angular velocity in the pan direction is ω pan_max year, When (x(t), y(t), z(t)) is the relative position of the HAPS beam antenna device at time t, [Math 1] The above equation (1) is true, and Ry and Rz are rotation matrices that satisfy the following: [Math 2] [Math 3] From equation (1), [Math 4] [Math 5] This can be calculated, [Math 6] [Number 7] The angle θ that satisfies equations (2) and (3) is defined as the predetermined angle. The beam antenna device according to feature 4.

6. The beam antenna device is The system includes an acquisition unit that acquires the current relative position (x, y, z) of the HAPS, The current relative position satisfies the following conditions: [Number 8] The control unit, [Number 9] [Number 10] Controlling the rotation of the first and second rotating bodies so that this occurs The beam antenna device according to feature 5.

Images