JP3300860B2 - Antenna device and receiving method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for receiving a radio wave arriving from a satellite such as a broadcasting satellite or a communication satellite, and more particularly, to an individual primary radiator for receiving radio waves arriving from a plurality of satellites. The present invention relates to an antenna device and a method for directing the antenna toward the satellite.

[0002]

2. Description of the Related Art When receiving radio waves arriving from a plurality of satellites, a separate parabolic antenna is used for each satellite.

[0003]

However, in such a case, it is necessary to install a number of parabolic antennas corresponding to the number of satellites to be received, which requires a large space for the installation of the parabolic antennas, or There was a problem that each antenna had to be adjusted so as to direct it to the satellite, and the work was very troublesome.

The present invention has been made to solve the above-mentioned problems (technical problems) of the prior art, and radio waves arriving from a plurality of satellites are respectively received by an antenna device using only one reflecting mirror. It is an object of the present invention to provide an antenna device and a receiving method that can be installed in such a manner that the space required for installation is small, and that the adjustment operation for pointing the antenna toward the satellite can be performed very easily.

[0005]

An antenna device according to the present invention comprises a reflector for reflecting radio waves arriving from a plurality of satellites, and a plurality of radio waves reflected by a reflector in front of the reflector. In the antenna device including a plurality of primary radiators each arranged at a position where the primary radiator can be individually received and a supporting device for supporting the reflecting mirror, the directions 7a and 8a of the reception polarization planes of the respective primary radiators are respectively It is set so as to coincide with the directions 45a and 46a of the polarization planes of the corresponding satellites 45 and 46, and the supporting device is provided at an intermediate position between the center of the aperture in the reflector and the intermediate point of the plurality of satellites. A first coupler capable of adjusting the azimuth of the point directing line, a second coupler capable of adjusting the elevation angle of the intermediate point directing line in the reflector, and having a scale indicating the elevation angle; Midpoint pointing lines in reflectors It is freely rotating reflector centered, and those constructed from the third coupler which has a scale indicating the rotation angle.

[0006]

In order to receive radio waves arriving from a plurality of satellites, respectively, the reflecting mirror is turned around the intermediate point directing line by the third coupler to adjust the rotation angle scale to a predetermined point. Further, the elevation angle of the reflector is adjusted so that the elevation scale has a predetermined value. Thereafter, the reflector is turned horizontally in the first coupler so that the radio wave can be received at the maximum level in any of the primary radiators. The adjustment is completed by these operations.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In FIG. 1, reference numeral 1 denotes an antenna device. Reference numeral 2 denotes a mast of the antenna device, which is installed in a vertical state, and whose lower end is fixed to a fixed object such as a foundation. Reference numeral 3 denotes a supporting device mounted on the top of the mast 2, and reference numeral 4 denotes a parabolic antenna supported by the supporting device 3, which is an offset parabolic antenna as an example. 5 is a reflector in the antenna 4, 6 is an arm for supporting a primary radiator, 7 and 8 shown in FIG. 4 are primary radiators for receiving radio waves arriving from different satellites, respectively. Even has a built-in converter. 9 is an output terminal of each primary radiator.

The primary radiators 7 and 8 will be described.
The primary radiator 7 is for receiving radio waves arriving from Superbird B as an example of a satellite.
Is for receiving an incoming radio wave from JCSAT2 as an example of another satellite. These primary radiators are arranged symmetrically with respect to the focal point F of the reflecting mirror 5 as shown in FIG. The interval between the two satellites corresponds to the interval between two satellites to be received. In FIG. 5, reference numeral 7a denotes the direction of the reception polarization plane of the primary radiator 7, which is inclined by 27.5 ° from the direction 5a of the long axis of the reflecting mirror 5. Reference numeral 8a denotes the direction of the reception polarization plane of the primary radiator 8, and the direction 5 of the short axis of the reflecting mirror 5.
34 ° from b. The primary radiator uses a number corresponding to the number of satellites that want to receive the transmitted radio wave. If the number is odd, one is placed at the position of the focal point F and the other is placed on the left and right of the Placed at intervals. In addition, in the case of an even number, they are arranged at positions separated by a predetermined interval on the left and right around the focal point F.

Referring again to FIG. 1, reference numeral 10 denotes the center of the opening of the reflecting mirror 5 (r = r '). Reference numeral 11 denotes a midpoint directing line in the reflecting mirror 5, and the center of the aperture when the radio waves coming from a plurality of satellites are individually received by the corresponding primary radiators.
This is a line connecting 10 with the intermediate positions of the above-mentioned plurality of satellites. The intermediate point directing line 11 is parallel to the optical axis (the central axis of the paraboloid of revolution) of the reflecting mirror 5 in this example. The intermediate position of a plurality of satellites is the intermediate position of the middle two satellites when the number of satellites is even, and is the position of the satellite located exactly in the middle when the number of satellites is odd.

Next, the support device 3 will be described. Fifteen
Denotes a first coupler, and a midpoint directing line 11 in the reflecting mirror 5
This is for adjusting the azimuth angle. Reference numeral 16 denotes a second coupler for adjusting the elevation angle of the intermediate point directing line 11. Reference numeral 17 denotes a third coupler for rotating the reflecting mirror 5 about the intermediate point directing line 11.

The first coupler 15 will be described. Reference numeral 21 denotes a base adapted to be along the mast 2, reference numeral 22 denotes a fastening piece opposed to the base 21 with the mast 2 interposed therebetween, and reference numeral 23 denotes a screw rod for tightening. These can fix the base 21 to the mast 2 by tightening the screw rod 23, and can rotate the base 21 around the mast 2 in the horizontal direction by loosening.
Reference numeral 24 denotes a stopper attached to the base 21 for engaging the upper end of the mast 2 to prevent the fitting 15 from dropping.

Next, the second coupler 16 will be described. This coupling uses the base 21 in common. Reference numeral 26 denotes a tilting body, which can tilt up and down with respect to a base 21 around a pivotal attachment 27 (for example, a screw rod). Reference numeral 28 denotes a fixture, for example, using a bolt, which is screwed to the base 21 through an elongated hole 29 formed in the tilting body 26. By loosening the fixture 28, the tilting body 26 can be freely tilted, and by tightening, the tilting body 26 is fixed to the base 21. Reference numeral 30 denotes a scale attached to the tilting body 26 for displaying the elevation angle of the intermediate point directing line 11. The fixture 28 also serves as an index for indicating the scale 30.

Next, the third coupler 17 will be described with reference to FIGS. 32 is a shaft body, which is a cylindrical body. Reference numeral 33 denotes a reflecting mirror mounting member attached to one end of the shaft body, and the reflecting mirror 5 is mounted on the mounting member 33. The relationship between the shaft 32 and the reflecting mirror 5 is such that the central axis of the shaft 32 matches the midpoint directing line 11 of the reflecting mirror 5. Reference numeral 34 denotes a support for supporting the shaft 32, which is fixed to the tilting body 26. Reference numeral 35 denotes a receiving portion of the receiving tool, which is formed in a semicircular arc shape corresponding to the shape of the shaft 32. Reference numeral 36 denotes a stopper attached to the receiving member 34 for preventing the shaft 32 from sliding down. Reference numeral 37 denotes a holding member provided so as to face the receiving member 34 with the shaft 32 interposed therebetween. Reference numeral 38 denotes a holding portion of the holding member 37, which is formed in a semicircular arc shape corresponding to the shape of the shaft 32. Numeral 39 denotes a screw rod for tightening, which penetrates the presser 37 and is screwed to a nut 40 fixed to the receiver 34.

In the third coupler 17 having the above structure, the shaft 32 is rotatable by loosening the tightening screw bar 39, and the reflecting mirror 5 is rotated about the intermediate point directing line 11. And presser 37 and holder 34 by tightening screw bar 39.
And can be fixed so that it cannot rotate with the shaft body 32 interposed therebetween. Reference numeral 41 shown in FIG. 4 denotes a scale provided on the shaft body 32, which is graduated on the entire circumference of the shaft body 32, for example, as a scale of 0 ° to 360 °. Note that 0 ° is a point at which the long axis 5a of the reflecting mirror 5 is located in the vertical plane. Reference numeral 42 denotes an index provided on the presser 37, which indicates a scale 41.
Note that the relationship between the shaft body 32, the receiving member 34, and the holding member 37 is relative, and the former may be attached to the tilting body 26, and the latter may be attached with a reflecting mirror.

Next, the installation of the antenna device will be described. First, the mast 2 is set up at a predetermined installation place, and the support device 3 is attached to the mast 2. Thereafter, the pre-assembled antenna 4 is attached to the supporting device 3.

Next, adjustment of the direction of the installed antenna will be described. First, the third coupler 17 is loosened, and the reflecting mirror 5 is rotated about the shaft 32 so that the index 42 indicates a scale 41 of a predetermined value for the installation area of the antenna. Then, the third coupler 17 is fixed at that position. As a result of this adjustment, when the antenna device 1 is viewed along the midpoint directivity line 11, the state shown in FIG. 6 is obtained. 6 is a rotation angle obtained by rotating the reflecting mirror 5 based on the scale 41. Next, the second coupler 16 is loosened, and the reflecting mirror 5 is swung up or down around the pivotal attachment 27 so that the indicator 28 indicates a scale 30 of a predetermined value for the installation area of the antenna. To Then, the second coupler 16 is fixed at that position. Next, for example, a level meter is connected to the output terminal 9 of any primary radiator. Then loosen the first coupler 15,
The reflecting mirror 5 is turned in the horizontal direction around the mast 2 so that the indicated value of the level meter becomes maximum. Then, the first coupler 15 is fixed in this state. This completes the adjustment work. In this completed state, the intermediate point directing line 11 is correctly directed to the intermediate points of a plurality of satellites, and the radio wave from the super bird B is reflected by the reflecting mirror 5 to be properly focused on the primary radiator 7 and the primary radiator 7 is focused. The radio wave received by the radiator 7 and the radio wave from the JCSAT 2 is reflected by the reflecting mirror 5, is correctly focused at the primary radiator 8, and is received by the primary radiator 8.

Next, FIG. 7 shows a state in which the satellite Superbird B (indicated by reference numeral 45) and the satellite JCSAT2 (indicated by reference numeral 46) are seen in Nemuro, and FIG. Show. In these figures, 51 is the geosynchronous orbit plane of both satellites, 52 is the vertical line in each area, 53 is the direction of the perpendicular to the geosynchronous orbit plane at the position of each satellite, 45
a and 46a indicate the directions of the polarization planes of the radio waves emitted from the respective satellites. In the antenna device having the above-described configuration, as described above, the reflecting mirror 5 is rotated as one, the scale 41 of the rotation angle is adjusted, and the reflecting mirror 5 is shaken up or down as two. The intermediate point directing line 11 can be correctly adjusted by adjusting the elevation scale 30 and turning the reflector horizontally in three directions.
45 and 46, and the directions 7a and 8a of the receiving polarization plane of each primary radiator in the antenna device are the satellites 45 and 46, respectively.
It becomes a state that coincides with the directions 45a and 46a of the polarization plane of 46, and even if the arriving radio wave is a circular polarization or the arriving radio wave is a linear polarization, regardless of the nature of those polarizations,
Circularly polarized waves or linearly polarized waves from any of the satellites can be properly received.

[0018]

As described above, according to the present invention, even when radio waves arriving from a plurality of satellites 45 and 46 are individually received by a plurality of primary radiators 7 and 8 respectively corresponding to the plurality of satellites 45 and 46, a plurality of the Is reflected by a single reflecting mirror 5 and can be received by individual primary radiators 7 and 8, respectively. When adjustment is performed to enable reception, the reflecting mirror 5 is rotated to adjust the scale 41 of the rotation angle, and
Shake the reflector 5 up or down to adjust the elevation scale 30 and then turn the reflector horizontally to adjust the azimuth, "just make three adjustments". Thus, there is an effect that radio waves from any of the satellites can be properly received. Moreover, in the present invention, the directions 7a and 8a of the reception polarization planes of the primary radiators are set so as to match the directions 45a and 46a of the corresponding polarization planes of the satellites 45 and 46, respectively. Therefore, even if the incoming radio wave is circularly polarized or the incoming radio wave is a linearly polarized wave, naturally, regardless of the nature of those polarized waves, Just performing "doing" has an effect that radio waves from any satellite can be properly received. As described above, according to the configuration of the present invention, there is no need for discrimination that requires specialized knowledge, such as whether an incoming radio wave is circularly polarized or linearly polarized. However, there is an effect that the adjustment work can be performed extremely easily and quickly ignoring these circumstances.

[Brief description of the drawings]

FIG. 1 is a side view of an antenna device.

FIG. 2 is a longitudinal sectional view of a third coupler.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a view in the direction of the arrow IV in FIG. 1 (a partially cutaway view).

FIG. 5 is a view of the primary radiator in the direction of arrow V in FIG. 1;

FIG. 6 is a view in the direction of the arrow VI in FIG. 1;

FIG. 7 is a diagram showing a state in which two satellites are viewed in Nemuro.

FIG. 8 is a diagram showing a state in which two satellites are viewed in Naha.

[Explanation of symbols]

 Reference Signs List 3 Supporting device 5 Reflector 7, 8 Primary radiator 11 Intermediate point directing line 15 First coupler 16 Second coupler 17 Third coupler

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01Q 3/00-3/46 H01Q 19/17

Claims (2)

(57) [Claims] 1. A reflector for reflecting radio waves arriving from a plurality of satellites, and a plurality of radio waves reflected by a reflector in front of the reflector are arranged at positions where they can be individually received. In the antenna device including a plurality of primary radiators and a supporting device that supports the reflecting mirror, the directions of the reception polarization planes of the respective primary radiators correspond to each other.
The satellite is set so that it matches the direction of the polarization plane of the satellite.
And a first coupler which can adjust the azimuth of a midpoint directional line connecting the center of the opening in the reflector and the midpoint of the plurality of satellites, and an intermediate part in the reflector. The second coupler having a scale capable of adjusting the elevation angle of the point directing line and indicating the elevation angle, and the rotation of the reflecting mirror centering on the intermediate point directing line in the reflecting mirror,
And a third coupler provided with a scale indicating the rotation angle thereof. 2. A reflecting radio waves coming respectively from a plurality of satellites in a single reflector, Oite anti them in front of the reflector
The above multiple radio waves reflected by the mirror can be individually received
In the method of individually receiving with a plurality of primary radiators arranged at different positions, the directions of the reception polarization planes of the respective primary radiators correspond to the respective ones in advance.
Be in a state that matches the direction of the polarization plane of the satellite
When the reception is performed, turning the reflector around the intermediate point directing line in the reflecting mirror, adjusting the elevation angle of the intermediate point directing line, and setting the azimuth angle of the intermediate point directing line to Performing the adjusting step.