JPS6175603A - Portable earth station antenna system for satellite broadcast - Google Patents

Abstract

PURPOSE:To open a relay broadcast earth station within a short time by containing amount while being folded upright at transportation, fixing a reflec tion mirror center part to the mount normally, incorporating a primary radiator together with a sub reflection mirror and mounting it to the center of the reflec tion mirror with one touch. CONSTITUTION:The antenna is of Cassegra in type and the main reflection mirror 1 is an axial symmetrical parabola reflection mirror. A primary radiator 2 has a sub reflection mirror 2a and a primary horn 2b, and the sub reflection mirror 2a is fixed to the tip and the primary aradiator 2 is attached and detached to/from the center of the main reflection mirror 1 in one touch. Fur ther, the main reflection mirror center 1a is fixed normally to a folded maount 3 and contained upright to a base 4 fixed to the floor of a cabin at transporta tion. When the antenna reaches a disaster-stricken district and a satellite relay broadcast earth station is opened, a pin 5 fixing the mount 3 to the base 4 is removed, the mount 3 is turned by 90 deg. around a pin bolt 6 and installed to the cabin floor via legs 7. Then the primary radiator 2 is fitted to the center of the main reflection mirror center part 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a portable earth station antenna device for satellite broadcasting used in the event of an emergency disaster.

In satellite broadcasting, highly mobile relaying is important in the event of an emergency disaster. If a small, portable earth station is brought to the disaster area and transmits radio waves to satellites, accurate information on the situation can be immediately communicated to the whole country. The establishment of an earth station for relay broadcasting on-site is required to be quick and reliable. The equipment for this portable earth station is usually moved by being mounted on a car. Large cars are not suitable for rushing to disaster areas, and small cars are generally used. In addition, if it is difficult to transport by land, it may be possible to transport the equipment by loading it on a helicopter. Therefore, it is necessary to make the structure compact.

b. Prior art A conventional portable earth station antenna device has a diameter of, for example, 2.5 mm.
The structure is such that the split-type main reflector (m) is first assembled and attached to a mount, and the sub-reflector and primary horn are individually attached to the main reflector. In this case, more than 30 minutes are consumed in configuring the high-precision antenna device.

Furthermore, the power width at half maximum of the large antenna is 12GI (0 in the Z band).
．． Because the main beam is sharp at 8 degrees, it is difficult to adjust the direction to catch satellites, and the establishment of a relay broadcasting earth station will be significantly delayed.

Problems to be solved by the C6 invention As a portable earth station antenna device for satellite broadcasting in the event of an emergency, it has a compact structure in which the main reflector is divided into a central part and a peripheral part so that it can be conveniently transported on a small car. However, upon arriving at the disaster-stricken area, we assembled a small earth station antenna in a short time, quickly and reliably caught the satellite, and immediately started relay broadcasting.Also, we enlarged the main reflector while operating it as an antenna. The problem of the present invention is to provide an earth station antenna that can ultimately achieve high performance as a large antenna and ensure high-quality broadcasting.

d8 Means for solving the problem The above problem is solved by the primary radiation system, which has a structure in which the reflector can be divided into a center part and a peripheral part of the reflector, and is easy to assemble, and a built-in circularly polarized wave generator, primary horn, etc. The reflector can be integrally attached to the center of the reflector, the center of the reflector is held by a reflector holding member, and the reflector holding member is held in a horizontal plane with respect to a mount fixed to the vehicle body or the ground. The center of the reflector is mounted rotatably around one horizontal axis on an azimuth-adjustable intermediate pedestal, and the elevation angle of the center of the reflector about the horizontal axis is set between one point of the reflector holding member and the intermediate pedestal. It has a foldable mount that is set by adjusting the length of a variable length rod placed between one point, and has a structure that directly connects the one point of the reflector holding member and the one point of the intermediate pedestal when moving. Solved by earth station antenna equipment.

e. Embodiment Hereinafter, a preferred embodiment of the portable earth station antenna device for satellite broadcasting according to the present invention will be described with reference to FIGS. 1 to 7.

FIG. 1 is a side view of the antenna device according to the present invention when it is completed as an earth station antenna.

This antenna is a high-performance Cassegrain type antenna, and as shown in Figures 1 and 2, the main reflector 1 has a diameter of 2.5 m.
This is an axisymmetric parabolic reflector.

The primary radiator 2 includes a sub-reflector 2a, a primary horn 2b,
A feed dome 2c made of glass finely reinforced resin (GFRP) to which the sub-reflector 2a is fixed at the tip and which protects the primary horn 2b from damage caused by rain and snow, and a primary radiator 2.
It is formed as an integrated primary radiator assembly consisting of a circularly polarized wave generator built into the feeding waveguide of the main reflecting mirror 1, and has a structure that can be attached to and detached from the center of the main reflecting mirror 1 in one click.

FIG. 2 is a front view of the parabolic reflector 1 shown in FIG. 1.

This main reflecting mirror 1 is made of carbon finely reinforced resin (CFRP) and is lightweight and strong, and is divided into five parts for ease of transportation. That is, the center portion 1a is an axisymmetric parabolic reflector with a diameter of 1.2 m, and the peripheral portion is 1.2 m in diameter.

It is divided into four parts: 1c + 1d + le. The weight of this one piece is 15 kg or less.

As shown in FIG. 3, the main reflecting mirror central portion 1a is always fixed to a foldable mount 3. When moving, it is stored upright on a base 4 fixed to the floor of the vehicle body.

To arrive at the disaster area and establish an earth station for satellite relay broadcasting, remove the pin 5 fixing the mount 3 to the base 4, rotate it 90 degrees around the pin bolt 6, as shown in Figure 4.
The mount 3 is installed on the floor of the vehicle body via the legs 7. First, the primary radiator 2 is attached to the center of the main reflecting mirror central portion 1a (not shown).

FIG. 5 is a top view of the portion of the earth station antenna device shown in FIG. 4 with the parabolic reflector removed.

When moving, fold the reflector holding member 8, remove the pin 9 that fixes it, raise the reflector 1a around the rotation axis 10, and remove the metal fitting 11a that fixes the variable length rod 11 to the reflector holding member 8. Rotate the rod 1 around the pin llb.
Fix the lower part of 1 with pin 9.

When the handle 12 of the variable length rod 11 is operated, pin 1
The elevation angle of antenna 1 is 40°±10″ with 0 as the central axis.
It can be adjusted within the range. The elevation angle of the antenna 1 during direction adjustment can be read on the scale 13.

' The direction adjustment of the azimuth angle is performed using the second screw rod 1.
4 by operating the handle 15. With respect to the mount 3, the intermediate pedestal 16 is placed in a horizontal plane with the pin 17a as the central axis.
Can be varied within the range of ±lO°. At this time, a guide pin 17c is fitted into the guide groove 17b, so that the antenna can operate smoothly without horizontal vibration during adjustment.

The guide pin 17c also serves as a lock bolt after the azimuth is determined. The deflection angle of the antenna during horizontal adjustment can be read on the scale 18.

In addition, as shown in FIG. 5, the mount 3 is a Y-shaped reinforcing member 3.
a, and the Δ-shaped reflector holding member 8 is also reinforced by the reinforcing member 8a.
is reinforced with.

In the present invention, as described above, the main reflector central portion 1a is an axisymmetric parabolic reflector with a diameter of 1.2 m, and when the primary reflector 2 is attached to this, it immediately operates as a Cassegrain antenna.

FIG. 6 is a side view when the earth station antenna device according to the present invention is used using only the main reflecting mirror central portion 1a. Its power half-width is 1 in the receiving frequency band of 12 GHz.
．． Since it is 28' and broad, it is easy to carry satellites.
You can do it. That is, upon arriving at the disaster area, first assemble a 1.2 m parabolic antenna, and connect the receiving end of the antenna output end to a receiver via a coaxial cable 20 via an 85 down converter 19.

By connecting the antenna input end and the transmitter with the waveguide 21, relay broadcasting can be started immediately as an earth station. In this case, the illuminance distribution of the excitation wave on the antenna aperture is as follows:
It has an optimal design. When the 1.2 m reflector 1a is used, the antenna gain is slightly lower than that of a standard design using a reflector of the same size. This makes the main beam broader by the amount of gain reduction, making it easier to adjust the direction to catch the satellite.

Next, while operating as an earth station with a 1.2m parabolic antenna, a central part 1a of the reflector and a peripheral part 1b+1 of the reflector were installed.
If c+ 1cL le is attached, the main reflector aperture diameter will operate as a Cassegrain antenna of 2.5m.

FIG. 7 is a rear view of the earth station antenna device when the peripheral portion of the reflector is attached.

Gain is approximately 10dB by attaching the peripheral part of the reflector.
The wide-angle directivity is improved, and the G/T is also significantly improved. In other words, it becomes a high-performance antenna and ensures high-quality relay broadcasting. Lightweight reflector peripheral area 1b+ 1c+ l
The d+le connection is secured using a wing nut, and this installation process can be completed within 10 minutes.

f9 Effects of the Invention The antenna device according to the present invention can be stored upright by folding the mount 3 during transportation, so the floor space occupied in the vehicle is reduced. In addition, the center part 1a of the reflector is always fixed to the mount 3, and the primary radiator 2, including the sub-reflector 2a, is an integral structure, and it is installed in the center of the reflector 1 with a single touch, so that it can easily reach the disaster area. After that, a relay broadcasting earth station can be opened and installed within a short time. Furthermore, a small antenna with a broad main beam can catch satellites quickly and reliably, and while operating relay broadcasts, it can also be used as a large, high-performance antenna by attaching the surrounding areas of the reflectors 1b, lc, ld, and le. As a result, it is possible to finally secure high-quality relay broadcasting in a short time.

[Brief explanation of drawings]

Fig. 1 is a side view of the antenna device according to the present invention when it is completed as an earth station antenna, Fig. 2 is a front view of the parabolic reflector shown in Fig. 1, and Fig. 3 is a mount of the antenna device according to the present invention. Fig. 4 is a side view of the antenna device shown in Fig. 3 when it is rotated 90'', and Fig. 5 is a side view of the earth station antenna device shown in Fig. 4 with the parabolic reflector removed. 6 is a side view when the earth station antenna device according to the present invention is used using only the center portion 1a of the reflector, and FIG. 7 is a side view when the peripheral portion of the reflector is attached. It is a rear view of the earth station antenna device.■...Main reflector, 1a...Reflector center, lb, lc, ld, 1e...Reflector periphery, 2...Primary radiator. , 2a... Sub-reflector, 2b... Primary horn 2C...
Feeding dome, 3...Mount, 3a...Mount reinforcing member, 4...Base, 5
... Pin, 6... Pin bolt, 7... Leg, 8... Reflector holding member, 8a... Reinforcement member, 9... Pin, 10... Rotating shaft, 11...・Variable length rod, lla...metal fitting, 11b...pin, 12...handle, 13...
・Scale, 14... Screw rod, 15... Handle, 16... Intermediate pedestal, 17a...
Pin, 17b... true inner groove, 17c...
...Guide pin, 18...Scale, 19...BS down converter, 20...Coaxial cable, 21...Waveguide. Figure 1 Figure 2 Figure 3 jI4 Figure 15

Claims (1)

[Claims] (1) A split reflector consisting of a center part of the reflector, a peripheral part of the reflector that can be attached to the center part of the reflector, and a circularly polarized wave generator.
A primary radiator assembly that has a built-in primary horn etc. and can be integrally attached to the center of the reflector, a reflector holding member that holds the center of the reflector, and a reflector that is rotatable about a horizontal axis. an intermediate pedestal to which a mirror holding member is attached; a variable length rod rotatably attached to one point of the reflecting mirror holding member and fixed to one point of the intermediate pedestal with a pin; and the intermediate pedestal is rotatable in a horizontal plane. It consists of a mount that can be attached to the intermediate pedestal and a means for adjusting and fixing the rotation angle of the intermediate pedestal with respect to the mount, and when moving, the one point of the reflector holding member and the one point of the intermediate pedestal are directly fixed with a pin. A portable earth station antenna for satellite broadcasting, which is characterized by having a foldable structure.