JPH0443704A - Satellite reception antenna system - Google Patents

Abstract

PURPOSE:To use a reflecting mirror for receiving a radio wave from a satellite in common and to simply the adjustment of the direction of plural radiators by using an offset reflecting mirror whose major axis is set laterally and arranging plural primary radiators with an electric focus of the reflecting mirror inbetween in obliquely front of the mirror. CONSTITUTION:An offset parabolic reflecting mirror is used horizontally. That is, a horn aperture 60a of a 1st satellite primary radiator 10a and a horn aperture 60b of a 2nd satellite primary radiator 10b are arranged almost on a line X and an electric focus F of the reflecting mirror 8 is placed on the line X. When the direction of the antenna is adjusted, a radio wave from a 1st satellite 1a is received by a 1st radio reception primary radiator 10a and a radio wave from a 2nd satellite 1b is received by a 2nd satellite reception primary radiator 10b in an excellent way respectively. Thus, even when a radio wave is received by plural satellites, the radio wave reception reflecting mirror is used by one satellite and the direction of the antenna is adjusted easily and simply the same as the reception of a radio wave from one satellite.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a method for transmitting radio waves from a plurality of geostationary satellites such as communication satellites and broadcasting satellites (for example, private communication satellites JC-8AT and Superbird) to a single reflecting mirror. The present invention relates to a satellite receiving antenna device capable of simultaneously receiving signals.

(Prior Art) In recent years, many geostationary satellites have been launched, and by receiving radio waves from each satellite on the ground, it has become possible to receive services in various broadcast modes. In addition, several geostationary satellites are scheduled to be launched in the future. The technology for receiving radio waves from these multiple geostationary satellites is as follows:
For example, there is a technology for a satellite receiving antenna device disclosed in Japanese Patent Laid-Open No. 62-51899. This technology uses an elliptical offset parabolic reflector (hereinafter also referred to as an offset reflector) in a vertically elongated manner, and radio waves from the first satellite in a geostationary satellite orbit above the equator are placed at the electrical focus of the reflector. The signal is received by the primary radiator for receiving the first satellite. In addition, radio waves from a second satellite that is aligned with the first satellite on a geostationary satellite orbit are received by a primary radiator for receiving the second satellite, which is installed at a position offset from the electrical focus of the same reflecting mirror. I have to.

(Problem to be Solved by the Invention) However, since the conventional satellite receiving antenna device described above uses an offset reflector in a vertically elongated manner, it can be used as a reflector for receiving radio waves from multiple satellites. If the mirror is also used as a reflector for receiving radio waves, there is a problem that radio waves from other satellites cannot be received sufficiently. In addition, since multiple radiators are lined up in the machine, each
In order to securely fix the secondary radiator to the reflector, a support with a complicated shape such as a Y shape or a star shape is required, and there is also the problem that installation and direction adjustment work for the secondary radiator is troublesome. be.

The present invention has been made in view of the above-mentioned prior art, and its purpose (b) is to reuse a reflector for receiving radio waves from one satellite even when receiving radio waves from multiple satellites. To provide a satellite receiving antenna device convenient for receiving radio waves from a plurality of satellites, which is inexpensive because it can be used, and can easily adjust the directions of a plurality of primary radiators.

(Means for Solving the Problems) In order to achieve the above object, the present invention 1d takes the measures as described in the claims above, and its effects are as follows.

(Function) When adjusting the direction of the satellite receiving antenna device, first adjust the polar axis direction adjustment tool so that the antenna and the antenna direction adjustment tool rotate around the polar axis direction (direction toward the North Star). Next, the antenna direction adjuster adjusts the elevation angle of the antenna to a predetermined elevation angle depending on the latitude of the installation location.

At that elevation angle, the antenna direction adjuster is rotated integrally with the antenna around the above-mentioned polar axis direction. This work is performed while measuring the level value corresponding to the reception level of any of the primary radiators. Then, the movement of the antenna direction adjuster is fixed in the direction where the level value is maximum. The primary radiator whose level value was measured during this adjustment is oriented in a direction where it can best receive radio waves from any one satellite. The other primary radiators are oriented in the direction that best allows them to receive radio waves from the other satellites on each side, and can be adjusted with just a few small adjustments.

Note that there is also a method of direction adjustment other than the above. Adjust both the polar axis direction adjustment tool and the antenna direction adjustment tool so that the antenna faces a predetermined elevation direction depending on the latitude of the installation location. Next, adjust the antenna direction adjustment tool so that the antenna is oriented at a predetermined angle depending on the longitude of the installation location with respect to the polar axis direction adjustment tool. Fix the positional relationship with the ingredients. Further, as described above, while measuring the level value corresponding to the reception level of any of the primary radiators, the antenna direction is adjusted by rotating the polar axis direction adjustment tool around the fixed object. It is sufficient to fix the polar axis adjustment tool so that it does not move at the position where the measured level value is maximum.

(Example) The drawings showing the embodiments of the present application will be described below.

FIG. 1 is a schematic perspective view of a satellite receiving antenna device, and FIG. 2 is an explanatory diagram of a radio wave path in the satellite receiving antenna device. 1a is the communication satellite Superbird A, which is exemplified as the first satellite, and 1b is JC, which is exemplified as the second satellite.
SAI-2 is shown respectively. For example, in the Nagoya region, these satellites 1a and lb are stationary at an angle of about 28 degrees and about 22 degrees on the horizontal plane axis from due south to east. 2Vi satellite receiving antenna device installed on the ground in gardens, etc. The satellite receiving antenna device 2 is constructed by attaching an antenna 7 to a support post 4 as a fixed object fixed on the ground using a polar axis direction adjustment tool 5 and an antenna direction adjustment tool 6.

Next, the antenna 7 will be explained in detail. Reference numeral 8 denotes a reflecting mirror, and the reflecting mirror 8e in one satellite receiving antenna 7e shown in FIG. 7 can be used as is without mirror surface correction. The reflecting mirror 8 may be manufactured by processing a steel plate as is well known, or may be made of FRP with a reflecting member such as a metal net embedded in the front surface. And its short axis diameter is 100~18
The one with a value of about 0 cM is selected. Reference numeral 9 denotes a support arm, which is fixed to the reflecting mirror 8 in a state in which it projects from the back side of the reflecting mirror 8 to the front side of the reflecting mirror 8 as shown in the figure. As the support arm 9,
For example, a die-cast aluminum alloy is used. 10a represents a primary radiator for receiving a first satellite, and 10b represents a primary radiator for receiving a second satellite.

11a represents a converter connected to the primary radiator 10a, and llb represents a converter connected to the primary radiator 10b.

Next, the polar axis direction adjustment tool 5 and the antenna direction adjustment tool 6 will be explained in detail. FIG. 3 is an enlarged and partially cutaway side view of the main part of the satellite receiving antenna device, and FIG. 4 is a rear view showing the main part of the satellite receiving antenna device in an enlarged manner. The polar axis direction adjustment tool 5 is composed of a hollow rotary cylinder 12, a pair of supports 13, a swinging body 14, an adjustment rod 15, and the like. Rotating cylinder 1
2 is made of a steel pipe, and the surface is plated with hot-dip galvanizing or the like. Further, its inner diameter is large enough to accommodate the tip of the support column 4, and a screw hole 16 is bored in the side surface. A bolt 17 is screwed into the screw hole 16. Reference numeral 18 denotes a pair of locking pieces, which are formed from steel plates into a substantially triangular shape, and have a through hole in the center.

Their base portions are welded to the rear side surface of the rotary cylinder 12, respectively. The pair of supports 13 are each formed by bending a steel plate. Each base piece 19 is a rotary cylinder 12
is welded to the tip. Reference numeral 20 denotes upright pieces, each of which extends in the same direction as the locking piece 18. The rocking body 14 is formed by processing a square steel pipe,
Its surface is plated with hot-dip galvanizing or the like. A through hole is bored in the upper side of this rocking body 14, and this through hole and a through hole provided in the upright piece of the support body 13 are overlapped, and the bolt 21 is passed through the through hole. be done.

The bolt 21 is the pivot of the polar axis adjustment tool 5, and a nut 22 is screwed into the threaded portion at the tip thereof. Further, below the rocking body 14, through holes are formed in both side walls 23, and a through hole 25 is formed in the top wall 24, respectively. 26 is a sliding body formed by joining two metal tubes together in a cross shape by means such as welding. The horizontal tube of this sliding body 26 is overlapped with the through hole in the lower side wall 23 of the rocking body 14, and the bolt 27 is passed through the through hole and the tube. A screw 28 is screwed into the threaded portion at the tip of the bolt 27.

The tip of the tube on the vertical side of the sliding body 26 is connected to the top wall 2 of the rocking body 14.
It protrudes upward from a through hole 25 provided in 4. Next, the adjustment rod 15 includes a rod body 29 having a threaded portion at its tip, and a tube body 30 connected to the base of the rod body 29 with its axis perpendicular to the rod body 29.
It is formed from. The rod body 29 is formed by processing a steel rod or a steel pipe, and the tube body 30 is formed by cutting out a steel pipe. These two are connected by welding. The holes in the tubular body 30 are overlapped with the through holes in the pair of locking pieces 18 described above, and the bolts 31 are passed through these holes. A nut 32 is screwed into the threaded portion at the tip of the bolt 31. A nut 34 is screwed onto the rod body 29 of the adjustment rod 15, and the vertical tube of the rocking body 14 is placed over the tip thereof. Furthermore, a nut 33 is screwed to the end thereof.

Next, the antenna direction adjustment tool 6 will be explained.

The antenna direction adjustment tool 6 includes a pair of tilting bodies 40 and a connecting body 41
, and a pair of mounting bodies 42. The pair of tilting bodies 40 are each formed by, for example, pressing a steel plate and applying plating such as hot-dip galvanizing. Each of them is provided with a base piece 43 and a rising piece 44, and the rising piece 4
41 has a round hole at the bottom and a long hole 45 at the top. Further, each base piece 43 is also provided with a through hole through which a port 46 for connecting the tilting body 40 and the mounting body 42 is inserted.

The connecting body 41 is made by punching out a steel plate, folding back the upper and lower parts toward the front to form a pair of rocking body mounting pieces 47, and further folding back both sides to form a pair of tilting body bristles. Each of the pair of rocking body mounting pieces 47 is provided with a through hole, and these through holes are overlapped with a through hole provided at the upper end of the rocking body 14, and the connecting bolt 48 is passed through the through hole.

A nut 49 is screwed into the threaded portion at the tip of the connecting bolt 48. In addition, two screw holes are provided in a row in each of the pair of tilting body bristles, and the upper screw hole is an elongated hole 45.
and the tilting body 40 so that the lower screw holes overlap the round holes respectively.
After the screws are fitted, bolts 50 or 51 are screwed into the respective screw holes. The pair of attachment bodies 42 are formed by punching out a metal plate such as a steel plate and bending it into an L-shape.

Reference numeral 52 indicates an attachment piece for attaching to the rib 54 on the back surface of the reflecting mirror 8, and 53 indicates an upper attachment piece of the tilting body. The attached piece 52 is provided with a threaded hole 56 formed by welding a nut at a position corresponding to the through hole for the upper fitting of the rib 54 of the reflector 8.
The attachment body 42 is attached to the reflecting mirror 8 by screwing the bolt 55 passed through the through hole 4 into the screw hole 56 of the attachment piece 52. The base piece 43 of the tilting body 40 is attached to the tilting body retaining piece 53.
Screw holes are provided at positions corresponding to the positions of the plurality of through holes, respectively, and these screw holes are used when connecting the tilting body 4o and the mounting body 42 with the bolts 46.

A fixture 65 is used to fix the positional relationship of each member of the antenna whose direction has been adjusted. This fixture 65
may be used as a handle when adjusting the antenna direction.

Next, the method of assembling the satellite receiving antenna device will be briefly explained.

(1) Set up a support 4 on the ground in a garden, etc.

(2) Assemble the antenna 7, polar axis direction adjustment tool 5, and antenna direction adjustment tool 6, respectively.

(3) Assemble the antenna direction adjustment tool 6 to the antenna reflector 8.

(4) Assemble the polar axis direction adjuster 5 to the support column 4.

(5) Connect the antenna direction adjustment tool 6 with the reflector 8 using the bolt 48 and nut 49.

A satellite receiving antenna device is assembled through the steps (1) to (5) above. Note that the order of steps (1) and (2) or the order of steps (3) and (4) may be reversed.

Next, the reflector 8 and the first and second satellite receiving radiators 1
The positional relationship with 0a and 10b will be explained in detail. A mounting body 42 is attached to the back surface of the reflecting mirror 8. Mounting body 4
The second attachment piece 52 has a substantially trapezoidal shape and has a narrow end 57.
a on the support arm attachment part 9a side of the reflector 8, and the wide end 57b on the opposite side of the support arm attachment part 9a.
mounted on. The first satellite receiving secondary radiator 10a is fixed to the tip of the support arm 9 with a holding piece 58a, and the second satellite receiving secondary radiator 10b is fixed to the tip of the supporting arm 9 with a holding piece 58b. When the secondary radiators 10a and 10b are fixed, as shown in FIG. 2, the horn opening 60a of the first satellite radiator 10a and the second satellite radiator 10b are The horn opening 60b of the pot is aligned substantially in a straight line X toward the reflecting mirror 8. This straight line X is the mounting body 4
The direction in which the arm 9 is taken out is determined to be perpendicular to the plane Y including the second tilting body fixing piece 53. The electrical focus F of the reflector 8 is located on this straight line X, the primary radiator 10a for the first satellite is closer to the reflector than the focus F, and the electrical focus F for the second satellite is The primary radiators 10b are positioned on the side farther from the reflecting mirror than the focal point F, and at positions sandwiching the focal point F from each other. The pointing directions of these first and second satellite radiators 10a and lQb are as follows: -order radiator 10b
is located closer to the support arm mounting portion 9a than the primary radiator 10a.

Next, the installation of the primary radiator 10a and IOb with converters will be described in detail. FIG. 5 shows the installation state of the primary radiators 10a*10b with converters, 61a and 61b are the primary radiators 510a and 10b, respectively.
The concave portions 62a and 62b provided at b indicate convex portions provided at the tip of the support arm 9, respectively. -order radiator 1゜a+1
0b places its concave parts 61a and 61b on the convex parts 62a and 62b at the tip of the support arm 9, covers them with the presser pieces 58a and 58b, respectively, and then screws the threaded rod 66 into the screw hole 67 and tightens it. Fixed. 68 indicates a through hole.

Next, the direction adjustment work of the above-mentioned satellite receiving antenna device will be explained.

(a) Rotate the rotary cylinder 12 in the direction of the arrow shown in FIG.
The swinging body 14 is also rocked in the direction of arrow B so that the bolt 48 faces in the polar axis direction (direction toward the North Star). When the polar axis is correctly oriented, tighten the bolts 17 and Nano H8, 22 to prevent the rotating cylinder I2 and the oscillator 14 from moving.

(b) Move the antenna direction adjuster 6 in the direction of arrow C shown in FIG. 3 to adjust the elevation angle of the antenna 7. For example, in the Nagoya region, the elevation angle is approximately 42.7 degrees. Once the elevation angle has been adjusted accurately, tighten POL) 50 and 51 and
゜ is fixed to the connecting body 41.

(c) Scan the antenna 7 by moving the antenna direction adjustment tool 6 in the direction of the arrow shown in FIG. 4 while checking the output of the first satellite converter lla with a level measuring device. When the reception level reaches the maximum, tighten the nut 49 to fix the antenna direction adjustment tool 6 so that it does not move.

(d) Finally, each member is fixed with a fixture 65 so that the positional relationship of each member is not disrupted.

If the direction of the antenna is adjusted according to the above method, the radio waves from the first satellite 1a will be transmitted to the primary radiator for receiving the 51st satellite, and the radio waves from the second satellite 1b will be transmitted to the primary radiator for receiving the 51st satellite. Both primary radiators can be received well. In FIG. 2, a dashed-dotted line G shows the arrival path of the radio waves from the first satellite 1a, and a dashed-double line H shows the arrival path of the radio waves from the second satellite 1b.

For reference, the path of the radio waves toward the focal point F is shown by a broken line J. This corresponds to the radio wave path Je in FIG.

FIG. 6 shows a different example of the primary radiator portion of the satellite receiving antenna device. Components corresponding to the previous one are indicated by the same reference numerals with the alphabet f appended thereto, and redundant explanations will be omitted. A branching filter for orthogonal polarization separation (also referred to as OMT) 70 is provided after the −-order radiator 10af. In this example, both vertically polarized radio waves and horizontally polarized radio waves from the satellite can be received.

As described above, the satellite receiving antenna device of the present application uses the polar axis direction adjustment tool 5 and the antenna direction adjustment tool 6 to adjust the antenna direction in an equatorial ceremony, and uses the offset parabolic reflector in a horizontally elongated manner. As a result, even if there are a plurality of -order radiators, it is possible to provide a support arm with a simple structure. This not only reduces manufacturing costs, but also reduces shielding of radio waves by the support arm, so-called blocking, and allows efficient reception of radio waves.

(Effects of the Invention) As described above, in the present application, even if radio waves from multiple satellites are to be received, the conventional reflecting mirror used for receiving radio waves from one satellite is used. A low-cost satellite receiving antenna device can be provided.

Moreover, since the satellite receiving antenna device of the present application is adjusted using an antenna direction adjustment tool and a polar axis direction adjustment tool, the antenna direction for receiving radio waves from a plurality of satellites lined up in a geostationary satellite orbit is adjusted. Another advantage is that adjustment work can be done as easily as receiving radio waves from a single satellite.

Furthermore, the present application has the effect that efficient radio wave reception can be performed.

[Brief explanation of the drawing]

The drawings relate to embodiments of the present application, and FIG. 1 is a schematic perspective view of a satellite receiving antenna device, FIG. 2 is an explanatory diagram of the radio wave path in the satellite receiving antenna device, and FIG. 3 is a main part of the satellite receiving antenna device. Fig. 4 is an enlarged rear view showing the main parts of the satellite receiving antenna device, and Fig. 5 shows how the primary radiator with converter is installed at the tip of the support arm. FIG. 6 is an exploded perspective view, FIG. 6 is a diagram showing a different example of a primary radiator with a converter, and FIG. 7 is a perspective view showing an antenna device for receiving radio waves from one satellite. 1a...first satellite, 1b...second satellite, 2.
- Satellite receiving antenna device, 4... Fixed object, 5... Polar axis direction adjustment tool, 6... Antenna direction adjustment tool, 7...
Antenna, 8... Reflector, 9... Support arm, 10a.
...First satellite reception-order radiator, 10b...Second satellite reception-order radiator, F...Electrical focus.

Claims (1)

[Claims] In a satellite receiving antenna device in which the polar axis direction adjustment tool is fixedly installed on a fixed object and the antenna and the polar axis direction adjustment tool are connected via the antenna direction adjustment tool, the offset parabolic reflector of the antenna is A satellite receiver characterized in that the antenna is attached to the antenna direction adjustment tool with its axial direction horizontal, and a plurality of primary radiators are arranged diagonally in front of the reflector, sandwiching the electrical focus of the reflector. antenna device.