JP4090838B2 - Antenna equipment for non-geostationary satellite - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antenna device that can be mounted on a satellite orbiting a non-stationary satellite orbit, and in particular, an antenna for mounting on a non-stationary satellite that performs communication with an earth station antenna installed in a coverage area of a specific area. It relates to the device.
[0002]
[Prior art]
Hereinafter, a conventional antenna device will be described (see Non-Patent Document 1). The conventional antenna device is installed on the north-south surface of the satellite, a reflector antenna fixed on the satellite and directed to the coverage area, a plurality of primary radiators that are also fixed on the satellite and feed radio waves to the reflector antenna. It consists of solar cell paddles. This satellite is launched in a geosynchronous orbit and is controlled so that the reference direction of the satellite is centered on the earth (center) and the solar cell paddle is oriented in the north-south direction.
[0003]
FIG. 13 is a diagram illustrating an arrangement example of the multi-beams 202 radiated from the antenna device configured as described above toward the coverage area 201. The coverage area 201 schematically illustrates a Japanese archipelago. ing. Here, as an example, a transmission process in the antenna device is assumed. A plurality of radio signals radiated into the space from a plurality of primary radiators are reflected by the reflector antenna to form a multi-beam that covers the coverage area. In general, one primary radiator corresponds to one beam, but a plurality of primary radiators may form one beam.
[0004]
In the conventional antenna device, the satellite is launched into a geosynchronous orbit, and the relative position between the earth and the satellite is fixed. Therefore, the direction of the coverage area viewed from the satellite is also fixed.
[0005]
[Non-Patent Document 1]
Ohm Publishing, edited by Naoshi Iida "Satellite Communications", 127-128 pages
[0006]
[Problems to be solved by the invention]
However, when the conventional antenna device is applied to a satellite that travels in a non-geostationary orbit where the orbit inclination angle is not 0 degrees, the relative position between the earth and the satellite changes. There was a problem that the direction and shape of the coverage area as seen from the view changed, and the beam was out of the coverage area.
[0007]
FIG. 14 is a diagram showing the problems of a conventional antenna device. For example, the far point is almost above Hokkaido in an orbital inclination angle of 45 °, an eccentricity of about 0.1, a far point altitude of about 40,000 km, and a period of 24 hours. The coverage area seen from the satellite when the satellite is launched in such a non-geostationary satellite orbit, the reference direction of this satellite is directed to the earth center (center), and the solar cell paddle is directed to the north-south direction The movement of is shown. In FIG. 14, 201a represents the coverage area seen from the satellite at the time of the far point-4 hours, 201b represents the coverage area seen from the satellite at the time of the far point, and 201c represents the coverage area seen from the satellite at the time of the far point + 4 hours. Represents. It can be seen that the coverage area has moved greatly with respect to the satellite due to the orbit of the satellite.
[0008]
The present invention has been made in view of the above, and even when the coverage area moves due to the orbit of the artificial satellite, the multi-beam, the forming beam, or the combination of the multi-beam and the shaped beam deviates from the coverage area. An object of the present invention is to obtain an antenna device for mounting on a non-geostationary satellite that can operate without any interference.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems and achieve the object, the antenna device for mounting on a non-stationary satellite according to the present invention is mounted on an artificial satellite that circulates on a non-stationary orbit and is configured by a plurality of beams. As a configuration for forming a multi-beam toward the required coverage area, the reference beam is directed to the ground reference position, and the coverage area is rotated around the ground reference position according to the orbit of the artificial satellite. Beam control means for controlling the directivity direction of the multi-beam antenna so as to cover the range with the multi-beam including the reference beam.
[0010]
According to the present invention, the reference beam is continuously directed to the ground reference position, and the rotation range of the coverage area is covered by a plurality of beams (multi-beams), for example, the beam corresponding to the current position of the rotating coverage area is selected. Thus, the required minimum number of spot beams are arranged without being affected by the movement of the coverage area due to the orbit of the satellite.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of an antenna device for mounting on a non-stationary satellite according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
[0012]
Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of a first embodiment of an antenna device for mounting on a non-stationary satellite according to the present invention. This non-stationary satellite-mounted antenna device receives a multi-beam antenna 11 that is mounted on a satellite and radiates a plurality of beams toward the earth, and radio signals of each beam radiated from the multi-beam antenna 11 toward the earth. Multi-beam terminals 61 to 72 for output (67 is a reference multi-beam terminal), a beam selector 12a for selecting a required number of beams from a plurality of multi-beam terminals 61, and similarly multi-beam terminals 62 to 65 , 69 to 72, beam selectors 12b to 12i for selecting a required number of beams, and a beam input / output terminal 101 for inputting and outputting a radio signal of the beam selected by the beam selector 12a. Beam input / output terminals 102 to 105 and 109 for inputting and outputting radio signals of the beams selected by the beam selectors 12b to 12i. 112, beam input / output terminals 106 to 108 respectively connected to the multi-beam terminals 66 and 68 and the reference multi-beam terminal 67, and a multi-beam antenna which controls the directing direction and selection method of the multi-beam according to the orbit of the satellite. 11 includes a beam controller 21 that outputs a directivity control signal and 11 outputs beam control signals to the beam selectors 12a to 12i.
[0013]
The multi-beam terminals 61 to 66 and 68 to 72 are terminal groups each composed of a plurality of terminals, 22 represents a directional control line for transmitting a directional control signal, and 23 represents a beam control signal. Represents a beam control line for transmission.
[0014]
2 is a diagram illustrating an example of rotation of the coverage area, and FIG. 3 is a diagram illustrating rotation of the coverage area schematically representing FIG. In the figure, 115a represents the coverage area seen from the satellite when rotated counterclockwise, 115b represents the coverage area seen from the satellite when rotated most clockwise, and 117 represents a ground reference for continuously directing the reference beam. Represents the position. 2 and 3, the satellite is in a non-stationary satellite orbit in which the orbit inclination angle is 45 °, the eccentricity is about 0.1, the far point altitude is about 40,000 km, and the far point is almost over Hokkaido in a cycle of 24 hours. Assuming that this satellite is used in a time zone in the range of about ± 4 hours at a far point.
[0015]
4 is a diagram showing the arrangement of multi-beams. 61a to 72a are multi-beams radiated from the multi-beam antenna 11 corresponding to the multi-beam terminals 61 to 72 in FIG. 1 (67a is a reference). Reference beam corresponding to the multi-beam terminal 67). Each of the beams 61a to 72a is fixedly arranged with respect to a coordinate shape with the multi-beam antenna 11 as a reference. The beams 61a to 72a are arranged so as to cover the entire rotation range of the coverage areas 115a to 115b. In addition, beams having the same sign (for example, beam 61a) are arranged at the same distance around the reference beam 67a, and the beams 61a to 66a and 68a to 72a are arranged concentrically. As a result, when a spot beam is selected from the fixed multi-beams, a required spot beam can be selected only from beams on the same radius of a concentric circle, so that control for re-forming the beam is facilitated.
[0016]
Here, the operation of the antenna device for mounting on a non-stationary satellite according to the present embodiment will be described. Note that the antenna device for mounting on a non-stationary satellite according to the present embodiment is applicable to both transmission and reception, but here, the case of reception is used for convenience of explanation.
[0017]
The multi-beam antenna 11 directs the reference beam 67 a to the ground reference position 117 based on the directivity control signal output from the beam controller 21 transmitted using the directivity control line 22. Thereby, from the satellite, as shown in FIGS. 2 and 3, the coverage areas 115 a to 115 b appear to rotate around the ground reference position 117.
[0018]
Further, the multi-beam antenna 11 is configured so that all the beams (corresponding to the multi-beam terminals 61 to 72) cover the rotation ranges of the coverage areas 115a to 115b based on the directivity control signal. , 68a to 72a). As a control method, for example, a mechanical drive system is installed in the multi-beam antenna 11, and the direction of the multi-beam antenna 11 is changed by moving the mechanical drive system.
[0019]
Next, the operation when the coverage area rotates from 115a to 115b and from 115b to 115a corresponding to the orbit of the satellite will be described. Corresponding to the rotating coverage area, the beam controller 21 uses the beam control line 23 to send beam control signals to the beam selectors 12a to 12i. In the beam selector 12a, signals of a plurality of spot beams 61a corresponding to the positions of the coverage area (ranges 115a to 115b) are selected from the multi-beam terminal 61 and output to the beam input / output terminal 101. Similarly, the other beam selectors 12b to 12i select signals of a plurality of spot beams (61a to 65a, 69a to 72a) from the multi-beam terminals 62 to 65 and 69 to 72, and beam input / output terminals 102 to 105, respectively. , 109 to 112.
[0020]
In FIG. 4, the signals of the beams 66a and 68a and the reference beam 67a are the same as the selected beam even when the coverage area is rotated. The signals are output to the beam input / output terminals 106 to 108 as signals of the beams 106a to 108a.
[0021]
FIG. 5 is a diagram showing an example of the arrangement of the spot beams selected in the state of the coverage area 115b, and 101a to 112a are spot beams respectively corresponding to the beam input / output terminals 101 to 112 in FIG.
[0022]
As described above, in the present embodiment, the reference beam 67a is continuously directed to the ground reference position, the rotation range of the coverage area is covered by the plurality of beams 61a to 72a, and further rotated by the beam selectors 12a to 12i. The beam corresponding to the position of the coverage area is selected. As a result, the minimum required number of spot beams can be placed without being affected by the movement of the coverage area due to the orbit of the satellite, and for mounting on non-stationary satellites that can operate so that multiple beams do not deviate from the coverage area. An antenna device can be obtained.
[0023]
In the present embodiment, the multi-beam antenna 11 is configured to perform the directivity control of the reference beam and the control of the directivity areas of the beams 61a to 72a that are fixedly arranged. Thereby, the structure of a multi-beam antenna can be simplified compared with the method of controlling individually the shape and number of multi-beams, and the arrangement position.
[0024]
In the present embodiment, the multi-beam antenna 11 controls the directivity direction of the reference beam 67a and the directivity areas of the beams 61a to 66a and 68a to 72a, and the beam selectors 12a to 12i select the beam. To distribute each function. Thereby, control of the beam controller 21 is also facilitated.
[0025]
In the present embodiment, for example, a method of mechanically driving the main body of the multi-beam antenna 11 is used as a method for controlling the directivity direction of the reference beam 67a and the beams (61a to 66a, 68a to 72a) by the multi-beam antenna 11. However, the present invention is not limited to this. For example, the attitude of the satellite body may be controlled, or the directivity of the beams 61a to 72a may be controlled collectively by adopting a phased array antenna system. Alternatively, it may be a digital beam forming antenna that samples the RF signal with discrete values and controls the amplitude phase as a digital signal.
[0026]
Further, the beam controllers 12a to 12i in the present embodiment are not particularly limited in the form of an RF analog circuit, an IF analog circuit, a digital circuit, or the like.
[0027]
In the present embodiment, the spot beams 101a to 112a are formed using all the beams 61a to 72a including the reference beam 67a. For example, a part of the beams and the spot beams are virtual beams. The corresponding beam input / output terminal, beam selector, and beam input / output terminal may be deleted. For example, the beam 64a and the spot beam 104a corresponding thereto are assumed to be virtual beams, and the corresponding multi-beam terminal 64, beam selector 12d, and beam input / output terminal 104 are deleted. The virtual beam, spot beam, multi-beam terminal, and beam input / output terminal may be the reference beam 67a, spot beam 107a, multi-beam terminal 67, and beam input / output terminal 107.
[0028]
In this embodiment, the beam selectors 12a to 12i are connected to the beams 61a to 65a and 69a to 72a, and the beam selector is not used for some of the beams 66a and 68a. A beam selector may be used for the beam.
[0029]
Embodiment 2. FIG.
FIG. 6 is a diagram showing the configuration of the second embodiment of the antenna device for mounting on a non-stationary satellite according to the present invention. It should be noted that the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. Here, instead of the beam selectors 12a to 12i, the spot beam 101b as a desired signal is generated by synthesizing the amplitude, phase, or both of the amplitude and phase of the signal from the multi-beam terminal 61, and the corresponding beam input / output is generated. The beam combiner 13a to be output to the terminal 101 is combined with the signals of the multi-beam terminals 62 to 65 and 69 to 72 by the same processing to generate the desired beams of the spot beams 102b to 105b and 109b to 112b as beam input / output terminals. Beam combiners 13b to 13i that output to 102 to 105 and 109 to 112, respectively.
[0030]
FIG. 7 is a diagram showing the arrangement of the spot beams synthesized in the state of the coverage area 115b, and 101b to 112b represent spot beams corresponding to the beam input / output terminals 101 to 112 in FIG.
[0031]
Here, the operation of the antenna device for mounting on a non-stationary satellite according to the present embodiment will be described. In the present embodiment, only operations and effects different from those of the first embodiment will be described.
[0032]
In the multi-beam antenna 11, the reference beam 67 a is directed to the ground reference position 117 based on the directivity control signal from the beam controller 21. In the multi-beam antenna 11, the directivity directions of the beams 61a to 72a are controlled so that all the beams 61a to 72a cover the rotation range of the coverage areas 115a and 115b.
[0033]
Next, in response to the position of the rotating coverage area, the beam controller 21 sends a beam control signal to each of the beam combiners 13a to 13i. The beam combiner 13a combines the signals of the multi-beam beam 61a, generates a plurality of spot beams 101b corresponding to the positions of the coverage areas 115a to 115b, and outputs them to the beam input / output terminal 101. The other beam combiners 13b to 13i perform the same processing, and output the spot beams 102b to 105b and 109b to 112b to the beam input / output terminals 102 to 105 and 109 to 112, respectively. That is, here, the beam is reformed so as to always have the same beam arrangement with respect to the coverage area.
[0034]
In FIG. 7, the beams 66a and 68a and the reference beam 67a are the same beam selected even when the coverage area is rotated. Therefore, the direct spot beam 106b is not controlled by the beam combiner. Are output to the beam input / output terminals 106 to 108 as .about.108b.
[0035]
Thus, in the present embodiment, the reference beam 67a is continuously directed to the ground reference position, the rotation range of the coverage area is covered by the plurality of beams 61a to 72a, and further rotated by the beam combiners 13a to 13i. It is configured to synthesize / select a beam corresponding to the position of the coverage area. As a result, the minimum required number of spot beams can be continuously arranged without being affected by the movement of the coverage area due to the orbit of the satellite.
[0036]
In the present embodiment, the multi-beam antenna 11 controls the directivity of the reference beam 67a and the directivity areas of the beams 61a to 66a and 68a to 72a, and the beam combiners 13a to 13i And make choices and distribute the functions respectively. Thereby, control of the beam controller 21 is also facilitated.
[0037]
Embodiment 3 FIG.
FIG. 8 is a diagram showing a configuration of a third embodiment of the antenna apparatus for mounting on a non-stationary satellite according to the present invention. In addition, the same code | symbol is attached | subjected about the structure similar to the above-mentioned Embodiment 1 or 2, and the description is abbreviate | omitted. In the present embodiment, there is provided a shaped beam former 14 for synthesizing the amplitude, phase or both amplitude and phase of the signals of all the multi-beam terminals 61 to 72 and outputting the desired signal after synthesis as a shaped beam 120a. . Reference numeral 120 denotes a shaped beam input / output terminal for inputting / outputting a signal of the shaped beam 120a.
[0038]
FIG. 9 is a diagram showing shaped beams arranged corresponding to the coverage areas 115a and 115b.
[0039]
Here, the operation of the antenna device for mounting on a non-stationary satellite according to the present embodiment will be described. In the present embodiment, only operations and effects different from those of the first or second embodiment will be described.
[0040]
In the multi-beam antenna 11, the reference beam 67 a is directed to the ground reference position 117 based on the directivity control signal from the beam controller 21. In the multi-beam antenna 11, the directivity directions of the beams 61a to 72a are controlled so that all the beams 61a to 72a cover the rotation range of the coverage areas 115a to 115b.
[0041]
Next, the beam controller 21 sends a beam control signal to the shaped beam former 14 corresponding to the position of the rotating coverage area. The shaped beam former 14 synthesizes the amplitude, phase or both amplitude and phase of the signals of the multi-beam terminals 61 to 72 based on the beam control signal, and a shaped beam 120a corresponding to the positions of the coverage areas 115a to 115b. Form. Then, a signal corresponding to the shaped beam 120 a is output to the shaped beam input / output terminal 120.
[0042]
As described above, in the present embodiment, the reference beam 67a is continuously directed to the ground reference position, the rotation range of the coverage area is covered by the plurality of beams 61a to 72a, and the coverage rotated by the shaped beam former 14 is further provided. A shaped beam corresponding to the position of the area is formed. Thereby, it is possible to form a shaped beam consistent with the position and shape of the coverage area without being affected by the movement of the coverage area due to the orbit of the satellite.
[0043]
Further, in the present embodiment, the multi-beam antenna 11 is configured to perform directivity control of the reference beam 67a and control of directivity areas of the beams 61a to 72a that are fixedly arranged. As a result, the structure of the multi-beam antenna can be simplified as compared with the method of directly forming the shaped beam by individually controlling the shape, number and arrangement position of the multi-beam.
[0044]
In the present embodiment, the multi-beam antenna 11 controls the directivity of the reference beam 67a and the directivity areas of the beams 61a to 66a and 68a to 72a, and the shaped beam former 14 Forming beams are formed from each, and their functions are dispersed. Thereby, control of the beam controller 21 is also facilitated.
[0045]
Embodiment 4 FIG.
FIG. 10 is a diagram showing a configuration of a fourth embodiment of the antenna device for mounting on a non-geostationary satellite according to the present invention, and here, a configuration in which the second embodiment and the third embodiment described above are combined is shown. . In addition, the same code | symbol is attached | subjected about the structure similar to the above-mentioned Embodiment 1, 2, or 3, and the description is abbreviate | omitted. In the present embodiment, the shaped beam former 14b for synthesizing the amplitude, phase or both amplitude and phase of the signals at the multi-beam terminals 61 to 64, and outputting the desired signal after synthesis as a shaped beam 121a, And a shaped beam former 14c that synthesizes both the amplitude, phase, and amplitude and phase of the signals at terminals 70 to 72, and outputs the desired signal after synthesis as a shaped beam 122a. Reference numerals 121 and 122 denote shaped beam input / output terminals for inputting / outputting signals of the shaped beams 121a and 122a, respectively.
[0046]
FIG. 11 is a diagram showing a spot beam and a shaped beam arranged corresponding to the coverage area 115b.
[0047]
Here, the operation of the antenna device for mounting on a non-stationary satellite according to the present embodiment will be described. In the present embodiment, only operations and effects different from those of the first, second, or third embodiment will be described.
[0048]
Corresponding to the position of the rotating coverage area, the beam controller 21 sends beam control signals to the beam combiners 13e and 13f and the shaped beam formers 14b and 14c. The beam combiner 13e combines the signals of the multi-beam beam 65a, selects a plurality of spot beams 105b corresponding to the positions of the coverage areas 115a to 115b, and outputs them to the beam input / output terminal 105. The beam combiner 13f performs the same processing and outputs the spot beam 109b to the beam input / output terminal 109. Further, the shaped beam former 14b controls the amplitude, phase or both amplitude and phase of each signal of the multi-beam terminals 61 to 72 based on the beam control signal, and shaped corresponding to the positions of the coverage areas 115a to 115b. A beam 121a is formed. Then, a signal corresponding to the shaped beam 121 a is output to the shaped beam input / output terminal 121. The shaped beam former 14 c also performs the same processing and outputs a signal corresponding to the shaped beam 122 a to the shaped beam input / output terminal 122.
[0049]
Thereby, in this Embodiment, the effect similar to above-mentioned Embodiment 2 and Embodiment 3 can be acquired.
[0050]
Embodiment 5. FIG.
FIG. 12 is a diagram showing the arrangement of multi-beams according to the fifth embodiment. 61c to 73a are beams of the multi-beams radiated from the multi-beam antenna 11 shown in the first to fourth embodiments (67c is a reference multi-beam). Reference beam corresponding to the terminal 67). Here, each of the beams 61c to 73c is fixedly arranged with respect to a coordinate shape with the multi-beam antenna 11 as a reference. Each beam 61c to 73c is arranged so as to cover the entire rotation range of the coverage areas 115a to 115b.
[0051]
In the first to fourth embodiments, beams having the same sign (for example, the beam 61a) are arranged at the same distance from the reference beam 67a, and the beams 61a to 66a and 68a to 72a are concentric. However, in the present embodiment, 61c to 66c and 68c to 73c are arranged in a triangular lattice pattern.
[0052]
The multi-beam arrangement shown in FIG. 12 can be applied to all of the above-described first to fourth embodiments. When this multi-beam arrangement is applied to each embodiment, the same effect can be obtained. .
[0053]
【The invention's effect】
As described above, according to the present invention, the reference beam is continuously directed to the ground reference position, the rotation range of the coverage area is covered by a plurality of beams, and the beam corresponding to the position of the rotating coverage area is selected. Possible configuration. As a result, the minimum required number of spot beams can be placed without being affected by the movement of the coverage area due to the orbit of the satellite, and for mounting on non-stationary satellites that can operate so that multiple beams do not deviate from the coverage area. There is an effect that an antenna device can be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a first embodiment of an antenna device for mounting on a non-stationary satellite according to the present invention.
FIG. 2 is a diagram illustrating an example of rotation of a coverage area.
FIG. 3 is a diagram showing rotation of a coverage area schematically showing FIG. 2;
FIG. 4 is a diagram showing an arrangement of multi-beams.
FIG. 5 is a diagram illustrating an arrangement example of spot beams selected when the coverage area is in a state;
FIG. 6 is a diagram showing a configuration of a second embodiment of an antenna device for mounting on a non-stationary satellite according to the present invention.
FIG. 7 is a diagram showing an example of the arrangement of spot beams synthesized in the state of a coverage area.
FIG. 8 is a diagram showing a configuration of a third embodiment of an antenna device for mounting on a non-stationary satellite according to the present invention.
FIG. 9 is a diagram showing a shaped beam arranged corresponding to each coverage area.
FIG. 10 is a diagram showing a configuration of a fourth embodiment of an antenna apparatus for mounting on a non-stationary satellite according to the present invention.
FIG. 11 is a diagram showing a spot beam and a shaped beam arranged corresponding to a coverage area.
FIG. 12 is a diagram showing an arrangement of multi-beams according to the fifth embodiment.
FIG. 13 is a diagram illustrating an arrangement example of multi-beams radiated from a conventional antenna device toward a coverage area.
FIG. 14 is a diagram illustrating a problem of a conventional antenna device.
[Explanation of symbols]
11 Multi-beam antenna, 12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i Beam selector, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h, 13i Beam combiner, 14, 14b , 14c Shaped beam former, 21 Beam controller, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72 Multi-beam terminal, 101, 102, 103, 104, 105, 106, 107 , 108, 109, 110, 111, 112 Beam input / output terminals, 120, 121, 122 Shaped beam input / output terminals.

Claims (6)

In an antenna device mounted on a non-stationary satellite that is mounted on an artificial satellite orbiting in a non-geostationary orbit and forms a multi-beam composed of a plurality of beams toward a required coverage area,
The reference beam includes a reference beam having a rotation range indicating the entire range that can be rotated in the coverage area that directs the reference beam to the ground reference position, and further rotates around the ground reference position according to the orbit of the artificial satellite. to cover the arranged multiple beams so as to include a part of the rotation range of the coverage area, and beam control means for controlling the orientation of the multibeam antenna,
Beam selecting means for selecting a beam corresponding to the shape of the current coverage area from multi-beams covering the rotation range of the coverage area;
An antenna device for mounting on a non-stationary satellite. In an antenna device mounted on a non-stationary satellite that is mounted on an artificial satellite orbiting in a non-geostationary orbit and forms a multi-beam composed of a plurality of beams toward a required coverage area,
Covering a reference beam with a reference beam having a rotation range indicating the entire range in which the reference beam is directed to the ground reference position and further rotating within a coverage area that rotates around the ground reference position according to the orbit of the artificial satellite. Beam control means for controlling the directivity direction of the multi-beam antenna so as to cover the multi-beam arranged so as to include a part of the rotation range of the area;
Beam combining means for combining the amplitude, phase or both amplitude and phase of a multi-beam signal covering the rotation range of the coverage area, and re-forming a beam corresponding to the shape of the current coverage area;
Non-geostationary satellite antenna device you comprising: a. In an antenna device mounted on a non-stationary satellite that is mounted on an artificial satellite orbiting in a non-geostationary orbit and forms a multi-beam composed of a plurality of beams toward a required coverage area,
Covering a reference beam with a reference beam having a rotation range indicating the entire range in which the reference beam is directed to the ground reference position and further rotating within a coverage area that rotates around the ground reference position according to the orbit of the artificial satellite. Beam control means for controlling the directivity direction of the multi-beam antenna so as to cover the multi-beam arranged so as to include a part of the rotation range of the area;
Shaping beam forming means for synthesizing the amplitude, phase or both amplitude and phase of a multi-beam signal covering the rotation range of the coverage area, and forming a shaped beam corresponding to the shape of the current coverage area;
Non-geostationary satellite antenna device you comprising: a. In an antenna device mounted on a non-stationary satellite that is mounted on an artificial satellite orbiting in a non-geostationary orbit and forms a multi-beam composed of a plurality of beams toward a required coverage area,
Covering a reference beam with a reference beam having a rotation range indicating the entire range in which the reference beam is directed to the ground reference position and further rotating within a coverage area that rotates around the ground reference position according to the orbit of the artificial satellite. Beam control means for controlling the directivity direction of the multi-beam antenna so as to cover the multi-beam arranged so as to include a part of the rotation range of the area;
A beam that combines the amplitude, phase, or both amplitude and phase of a predetermined number of beam signals covering a specific part of the rotation range of the coverage area, and reshapes the beam corresponding to the specific part of the shape of the current coverage area Combining means;
Synthesize the amplitude, phase or both amplitude and phase of the signal of a predetermined number of beams covering the remaining part other than the specific part of the rotation range of the coverage area, and correspond to the remaining part of the shape of the current coverage area A shaped beam forming means for forming a shaped beam;
Non-geostationary satellite antenna device you comprising: a. The antenna apparatus for mounting on a non-stationary satellite according to any one of claims 1 to 4 , wherein the multi-beams covering the rotation range of the coverage area are arranged concentrically with a reference beam as a center. . The non-geostationary satellite mounting according to any one of claims 1 to 4 , wherein the multi-beams covering the rotation range of the coverage area are arranged so as to form a triangular lattice with the reference beam as a center. Antenna device.

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