JPH0716128B2 - Truss structure antenna - Google Patents
Truss structure antennaInfo
- Publication number
- JPH0716128B2 JPH0716128B2 JP18515086A JP18515086A JPH0716128B2 JP H0716128 B2 JPH0716128 B2 JP H0716128B2 JP 18515086 A JP18515086 A JP 18515086A JP 18515086 A JP18515086 A JP 18515086A JP H0716128 B2 JPH0716128 B2 JP H0716128B2
- Authority
- JP
- Japan
- Prior art keywords
- mirror surface
- fixed
- antenna
- truss structure
- side lobe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Aerials With Secondary Devices (AREA)
Description
【発明の詳細な説明】 本発明は、高い鏡面精度が必要とされる大口径のアンテ
ナ、例えば、衛星搭載用の大口径アンテナに関するもの
である。Description: TECHNICAL FIELD The present invention relates to a large-diameter antenna for which high mirror surface accuracy is required, for example, a large-diameter antenna mounted on a satellite.
（従来の技術） 従来のアンテナの鏡面は、CFRPの表皮を両面に有し、そ
の間にアルミニウムハニカム製のコアを有するサンドイ
ッチ構造のものであり、高精度の要求される大口径アン
テナ用の大形鏡面を製造するには製造誤差が大きく充分
な性能のアンテナ鏡面を得ることができなかった。これ
を解決するためトラス構造アンテナ鏡面が考えられ、薄
い殻状の鏡面をトラス構造の骨組みに接続・固定すると
ともに、接続部にトラス構造と殻状の鏡面との間隔を調
整できる鏡面調整機構を用いることにより、トラス構造
や鏡面を構成する殻（鏡面殻）の製造誤差にかかわら
ず、所望の形状の鏡面が得られるように成されていた。(Prior Art) The mirror surface of a conventional antenna is a sandwich structure having CFRP skins on both sides and an aluminum honeycomb core between them, and is a large-sized antenna for a large-diameter antenna that requires high accuracy. There was a large manufacturing error in manufacturing a mirror surface, and an antenna mirror surface with sufficient performance could not be obtained. In order to solve this, a truss structure antenna mirror surface is conceivable.A mirror surface adjustment mechanism that can connect and fix a thin shell-shaped mirror surface to the frame of the truss structure and adjust the distance between the truss structure and the shell-shaped mirror surface is provided at the connection part. By using it, a mirror surface having a desired shape can be obtained regardless of a manufacturing error of a truss structure or a shell (mirror surface shell) forming a mirror surface.
第１図（ａ）は従来のトラス構造アンテナの鏡面の固定
点の配置を示す図である。第１図において、１の黒丸は
鏡面調整機構を介して鏡面殻がトラス構造に固定される
固定点、２は鏡面殻、３はトラス構造である。鏡面調整
機構としては、種々の構造のものが公知である。例え
ば、特開昭60−72305号公報には、その一例として、先
端に球状の突起を有する金具を１つの鏡面殻の裏部に取
り付け、この球状突起を台金具に２つのナットで止めた
四つ割りボルトでつかむようにし、この四つ割りボルト
の長さを上述の２つのナットによって調整する構成が開
示されている。FIG. 1 (a) is a diagram showing the arrangement of fixed points on the mirror surface of a conventional truss structure antenna. In FIG. 1, a black circle 1 is a fixing point at which the mirror surface shell is fixed to the truss structure via a mirror surface adjusting mechanism, 2 is a mirror surface shell, and 3 is a truss structure. As a mirror surface adjusting mechanism, various structures are known. For example, in Japanese Patent Laid-Open No. 60-72305, as an example, a metal fitting having a spherical projection at the tip is attached to the back of one mirror shell, and the spherical projection is fixed to a base fitting with two nuts. There is disclosed a configuration in which the bolt is gripped by a split bolt, and the length of the split bolt is adjusted by the two nuts described above.
この際、鏡面調整機構を設ける間隔は、トラス構造によ
り決まる鏡面調整機構設置の容易な一定の粗な間隔であ
った。At this time, the interval for providing the mirror surface adjusting mechanism was a fixed coarse interval that was easy to install the mirror surface adjusting mechanism determined by the truss structure.
（発明が解決しようとする問題点） このため、宇宙空間の苛酷な温度条件の下でトラス構造
と鏡面殻の熱膨張係数の差に起因する周期的な熱変形を
生じ、アンテナの重要な電気性能の１つであるサイドロ
ーブ特性が、通信に影響のある範囲内において、変形が
無い場合に比べて大きく劣化するという不具合を生じて
いた。また、第１図（ｂ）に示すようにサイドローブ特
性が劣化しないように細かい間隔で固定する場合、多数
の鏡面調整機構が必要となったり、時には、調整機構の
配置に合うようにトラス構造の間隔を細かくするため、
アンテナの製造・調整に多大の時間と人手を要しコスト
が高くなる、衛星搭載用アンテナとして重要な性能の１
つである軽量性が損なわれるというような欠点を生じて
いた。本発明は、トラス構造アンテナにおける所望の領
域におけるサイドローブ特性の劣化および鏡面調整機構
数の増加による鏡面調整の手間の増加、アンテナ全体の
重量の増加をなくすための手段を提供するものである。(Problems to be solved by the invention) Therefore, under severe temperature conditions in outer space, periodic thermal deformation occurs due to the difference in thermal expansion coefficient between the truss structure and the specular shell, and the important electric A side lobe characteristic, which is one of the performances, is greatly deteriorated within a range that affects communication, as compared with the case where there is no deformation. In addition, as shown in FIG. 1 (b), when fixing at a fine interval so that the side lobe characteristics are not deteriorated, a large number of mirror surface adjustment mechanisms are required, and sometimes the truss structure is adjusted to match the arrangement of the adjustment mechanisms. To make the interval of
It takes a lot of time and labor to manufacture and adjust the antenna, and the cost is high.
However, there is a drawback that the lightness, which is a problem, is impaired. The present invention provides means for eliminating the side lobe characteristic deterioration in a desired region in a truss structure antenna, the increase in the time and effort required for mirror surface adjustment due to an increase in the number of mirror surface adjustment mechanisms, and the increase in the weight of the entire antenna.
（問題点を解決するための手段） 本発明では、これらの欠点をなくすため、鏡面調整機構
を鏡面の中央部では粗な間隔で、また、鏡面の周辺部で
は密な間隔で配置するように鏡面調整機構の配置を定め
ることにより、サイドローブ特性を改善できるとともに
通信に影響の無いようにサイドローブの現れる位置を定
めることができるようにしたものである。第１図
（ｃ），（ｄ）に間隔が粗の部分、密な部分が示されて
いるが、これらの図から明らかなように、中央部とは中
心から外縁までの略半分のところまで、周辺部とは該略
半分のところから外縁まで相当しており、具体的には、
鏡面を保持するトラス構造の間隔、構成に依存するもの
である。密な間隔と粗な間隔とは例えば1:2程度とし、
かつ、サイドローブを抑左する方向に応じて前記間隔は
調節されるものとする。(Means for Solving Problems) In the present invention, in order to eliminate these drawbacks, the mirror surface adjusting mechanism is arranged at a coarse interval in the central portion of the mirror surface and at a close interval in the peripheral portion of the mirror surface. By defining the arrangement of the mirror surface adjusting mechanism, the side lobe characteristics can be improved and the position where the side lobes appear can be defined so as not to affect communication. 1 (c) and 1 (d) show a rough portion and a dense portion, but as is clear from these figures, the central portion is approximately halfway from the center to the outer edge. The peripheral part corresponds to the outer edge from the approximately half position, and specifically,
It depends on the distance and structure of the truss structure that holds the mirror surface. For example, the close interval and the coarse interval are about 1: 2,
In addition, the interval is adjusted according to the direction in which the side lobe is suppressed.
（作用） 鏡面の中央部と周辺部で鏡面調整機構による鏡面殻のト
ラス構造への固定点を配置する間隔を変化させ、過酷な
条件下での熱変形の周期性を少なくするとともに変形量
も低減することにより、鏡面全体を一様に粗な間隔で鏡
面調整機構により固定した場合に比して、サイドローブ
レベルも低くサイドローブの現れる位置を通信に影響の
無い位置にでき、また、鏡面全面を一様に密な間隔で鏡
面調整機構により固定した場合に比して、鏡面調整機構
数の削減が可能となり鏡面調整の手間の増加、アンテナ
全体の重量の増加を抑えることができる。(Operation) By changing the interval at which the fixing points of the mirror shell are fixed to the truss structure by the mirror adjusting mechanism at the center and the periphery of the mirror surface, the periodicity of thermal deformation under severe conditions is reduced and the amount of deformation is also reduced. By reducing it, the side lobe level is lower and the position where the side lobes appear can be set at a position that does not affect communication, compared to the case where the entire mirror surface is fixed by a mirror surface adjustment mechanism at a uniform coarse interval. As compared with the case where the entire surface is fixed by the mirror surface adjusting mechanism at uniform intervals, the number of mirror surface adjusting mechanisms can be reduced, and the time and effort for mirror surface adjustment and the weight of the entire antenna can be suppressed.
（実施例） 第１図には、従来の固定点配置である（ａ）（ｂ）の他
に、（ｃ）として中央部を等間隔で固定して低サイドロ
ーブ特性が得られるとともにサイドローブレベルのピー
クが通信に影響の無い位置になる間隔d2の２倍程度に粗
な間隔d1で、周辺部を密な間隔d2で固定する本発明のア
ンテナ鏡面固定点の配置例を示しており、（ｄ）として
本発明とは逆に中央部を密な間隔d2で、周辺部を粗な間
隔d1で固定し固定点数の節約を図った鏡面固定点の配置
例が示してあるまた、第２図には鏡面全面にわたり粗に
固定した従来の鏡面固定点配置（第１図（ａ）の配置）
によるアンテナのサイドローブ特性を曲線Ａとして、鏡
面全面にわたり密に固定した場合の固定点配置（第１図
（ｂ）の配置）によるアンテナのサイドローブ特性を曲
線Ｂとして、本発明の固定点配置（第１図（ｃ）の配
置）によるアンテナ鏡面を用いた場合のアンテナのサイ
ドローブ特性を曲線Ｃとして、中央部を密に周辺部を粗
に固定した固定点配置（第１図（ｄ）の配置）によるア
ンテナのサイドローブ特性を曲線Ｄとして、それぞれ示
してある。(Embodiment) In FIG. 1, in addition to the conventional fixed point arrangements (a) and (b), as shown in (c), the central portion is fixed at equal intervals to obtain low side lobe characteristics and side lobes. An example of arrangement of antenna mirror surface fixing points of the present invention is shown in which the level peak is fixed at a distance d 1 which is roughly twice as large as the distance d 2 where it does not affect communication and the peripheral portion is fixed at a close distance d 2. In contrast to the present invention, (d) shows an example of arrangement of mirror-fixed points in which the central portion is fixed at a close spacing d 2 and the peripheral portion is fixed at a coarse spacing d 1 to save the number of fixed points. Also, in FIG. 2, the conventional mirror surface fixing point arrangement in which the entire mirror surface is roughly fixed (arrangement of FIG. 1 (a))
The side lobe characteristic of the antenna according to the above is a curve A, and the side lobe characteristic of the antenna according to the fixed point arrangement (arrangement of FIG. 1B) when densely fixed over the entire mirror surface is a curve B, and the fixed point arrangement of the present invention is shown. A fixed point arrangement in which the side lobe characteristics of the antenna when the antenna mirror surface according to (arrangement of FIG. 1C) is used is a curve C and the central portion is densely fixed and the peripheral portion is roughly fixed (FIG. 1D). The side lobe characteristic of the antenna according to (arrangement) is shown as a curve D, respectively.
日本を対象とした衛星通信においては、例えば周波数の
繰り返し使用を行うためのサイドローブによる干渉を低
いレベルに抑える必要のある東京・大阪間、札幌・東京
間等は、0.8〜1.2度の間であり1.5℃以内の角度にサイ
ドローブレベルの高い個所が無いという特性が得られれ
ば良い。In satellite communication targeting Japan, for example, between Tokyo and Osaka, between Sapporo and Tokyo, where it is necessary to suppress the interference due to side lobes for repeated frequency use to a low level, between 0.8 and 1.2 degrees. Yes, it is sufficient if the characteristic that there is no high sidelobe level at an angle within 1.5 ° C is obtained.
これを満足するように定めた本発明の一実施例のアンテ
ナ鏡面の固定点の間隔は使用周波数の波長をλとして中
央部で50λ、周辺部で25λ程度としたとき、第２図中に
Ｃの線でその特性計算結果を示すように、サイドローブ
レベルも低くサイドローブの現れる位置を通信に影響の
無い位置に配置できている。従来の鏡面全体を粗に固定
した場合についてのサイドローブ特性の計算結果は第２
図のＡに示すとおりであるが、サイドローブレベルのピ
ークは約0.9度のところにあり、曲線Ｃのピークレベル
よりも大きい値となっている。第２図のＢは鏡面全体を
密に固定した場合についてのサイドローブ特性であり、
電気特性としては所望の特性が得られている。また、第
２図のＤは中央部を密に固定し周辺部を粗に固定したも
ののサイドローブ特性の計算結果である。サイドローブ
レベルのピークは約0.9度のところにあり、ピークレベ
ルも本発明のよるＣのものより大きい値となっている。The spacing between the fixed points on the antenna mirror surface of the embodiment of the present invention determined to satisfy this is C in FIG. 2 when the wavelength of the operating frequency is λ and the central portion is about 50λ and the peripheral portion is about 25λ. As the result of the characteristic calculation is shown by the line, the side lobe level is low and the position where the side lobe appears can be arranged at a position that does not affect communication. The calculation result of the side lobe characteristic in the case where the whole mirror surface is roughly fixed is
As shown in A of the figure, the peak of the side lobe level is at about 0.9 degree, which is larger than the peak level of the curve C. B of FIG. 2 is a side lobe characteristic in the case where the entire mirror surface is tightly fixed,
The desired electrical characteristics are obtained. Further, D in FIG. 2 is the calculation result of the side lobe characteristics of the case where the central portion is fixed tightly and the peripheral portion is fixed roughly. The peak of the side lobe level is about 0.9 degree, and the peak level is also larger than that of C according to the present invention.
これより、アンテナ鏡面の常識的な考えに反して鏡面の
中央部の影響が少なく、周辺部に影響が大きいこと、本
発明の固定点配置に従い鏡面調整機構を鏡面の中央部で
は粗に、鏡面の周辺部では密に配置するように鏡面調整
機構の間隔を定めることによりサイドローブレベルも低
くサイドローブの出現する位置を通信に影響の無い位置
にできることが分かる。第３図には第２図のA,B,C,Dを
計算により求める際に用いた鏡面変形のパターンをそれ
ぞれＡ′,B′,C′,D′，として示す。From this, contrary to the common sense of the antenna mirror surface, the influence of the central portion of the mirror surface is small and the influence on the peripheral portion is large, and according to the fixed point arrangement of the present invention, the mirror surface adjustment mechanism is rough in the central portion of the mirror surface, It can be seen that the side lobe level is low and the position where the side lobes appear can be set to a position that does not affect communication by setting the intervals of the mirror surface adjusting mechanisms so that they are densely arranged in the peripheral part. FIG. 3 shows the patterns of mirror surface deformation used when calculating A, B, C and D in FIG. 2 as A ′, B ′, C ′ and D ′, respectively.
第３図Ａ′は従来の鏡面全面にわたり鏡面精度調整点間
隔が粗で変形も大きい場合、Ｂ′は鏡面全面にわたり鏡
面精度調整点間隔が密で変形も小さい場合、Ｃ′は鏡面
の周辺部の鏡面精度調整点を増加させ変形量を低減する
ことによりその部分の変形の周期が短くなった場合、
Ｄ′は鏡面の中央部の鏡面精度調整点を増加させ変形量
を低減することによりその部分の変形の周期が短くなっ
た場合をそれぞれ想定したものであるが、サイドローブ
に影響の大きい波状の変形についてのみ着目し変形を模
擬しており、理想鏡面より第３図に示す鏡面変形が生じ
たとしてサイドローブ特性の計算を行っている。FIG. 3A 'is a case where the mirror surface precision adjustment point interval is coarse and the deformation is large over the conventional mirror surface, B'is a mirror surface precision adjustment point interval over the entire mirror surface is dense and the deformation is small, and C'is a peripheral portion of the mirror surface. If the cycle of deformation of that part is shortened by increasing the number of mirror surface precision adjustment points and reducing the amount of deformation,
D'is based on the assumption that the cycle of deformation of that portion is shortened by increasing the mirror surface precision adjustment point at the center of the mirror surface and reducing the amount of deformation. The deformation is simulated by paying attention only to the deformation, and the side lobe characteristics are calculated assuming that the mirror surface deformation shown in FIG. 3 occurs from the ideal mirror surface.
鏡面全体にわたり鏡面調整機構による固定点を密に配置
すれば、第２図のＢとして示すように鏡面の温度変化に
対する鏡面の変形の量と周期が小さくなりサイドローブ
レベルが小さくなるとともにサイドローブのピークが通
信に影響の無い位置にできることは明らかであるが、本
発明の固定点配置を採用する場合に比して、鏡面を固定
するための鏡面調整機構数の増大は避けられず、重量の
増加を生じることは明白である。また、鏡面調整機構を
鏡面全体にわたり所望の位置につけるためには、時には
トラス構造の変更部材の増加にもつながる場合もありそ
の際には、重量の増加もより一層大きなものになる。If the fixed points by the mirror surface adjusting mechanism are densely arranged over the entire mirror surface, the amount and period of the mirror surface deformation with respect to the temperature change of the mirror surface becomes small as shown in FIG. 2B, the side lobe level becomes small and the side lobe level becomes small. Although it is clear that the peak can be located at a position that does not affect communication, an increase in the number of mirror surface adjusting mechanisms for fixing the mirror surface is unavoidable as compared with the case where the fixed point arrangement of the present invention is adopted, and the weight is reduced. It is clear that it causes an increase. Further, in order to place the mirror surface adjusting mechanism at a desired position over the entire mirror surface, it may sometimes lead to an increase in the number of members for changing the truss structure, and in that case, the increase in weight becomes even greater.
（発明の効果） 以上説明したように、本発明のトラス構造アンテナで
は、鏡面調整機構の配置を鏡面中央部では粗の間隔で配
置し、この鏡面中央部の周りの鏡面周辺部では上述した
粗の間隔より密な間隔で配置している。このように、中
央部に近い部分と周辺に近い部分とで調整機構の配置間
隔に上述のごとき差をもたせているので、その相対的な
差に応じた次のごとき効果が得られる。即ち、鏡面調整
機構数を大幅に増加させることなく、少ない重量でサイ
ドローブレベルも低くサイドローブの現れる位置を通信
に影響の無い位置に配置することが可能となり、また鏡
面調整の手間の増加も少なく、軽量で電気性能も優れた
衛星搭載用のアンテナを実現できる。(Effects of the Invention) As described above, in the truss structure antenna of the present invention, the mirror surface adjusting mechanism is arranged with a rough interval in the central portion of the mirror surface. They are arranged at a closer spacing than the spacing. In this way, the above-described difference is provided in the arrangement interval of the adjusting mechanism between the portion close to the central portion and the portion close to the periphery, so that the following effects depending on the relative difference can be obtained. In other words, without significantly increasing the number of mirror surface adjustment mechanisms, it is possible to arrange the position where the side lobe level is low and the side lobe appears at a position that does not affect communication without increasing the number of mirror surface adjustment mechanisms. It is possible to realize a satellite-mounted antenna that is small, lightweight, and has excellent electrical performance.
第１図はアンテナの鏡面の固定点の配置を示す図、第２
図は種々の鏡面固定点配置に対するサイドローブ特性の
計算値を示す図、第３図は種々の鏡面固定点配置の対す
るサイドローブ特性に対応する鏡面変形パターンを示す
図である。 １は鏡面調整機構を介して鏡面殻とトラス構造を接続・
固定する点 ２は鏡面殻 ３はトラス構造 Ａは従来の鏡面全面にわたり粗に固定した場合のアンテ
ナサイドローブ特性 Ｂは従来の鏡面全面にわたり密に固定した場合のアンテ
ナサイドローブ特性 Ｃは本発明の１実施例のアンテナサイドローブ特性 Ｄは鏡面中央部を密に、鏡面周辺部を粗に固定した場合
のアンテナサイドローブ特性 Ａ′は従来の鏡面全面にわたり粗に固定した場合のアン
テナ鏡面の変形例を示す曲線 Ｂ′は従来の鏡面全面にわたり密に固定した場合のアン
テナ鏡面の変形例を示す曲線 Ｃ′は本発明の１実施例のアンテナ鏡面の変形例を示す
曲線 Ｄ′は鏡面中央部を密に、鏡面周辺部を粗に固定した場
合のアンテナ鏡面の変形例を示す曲線FIG. 1 is a diagram showing the arrangement of fixed points on the mirror surface of the antenna, and FIG.
FIG. 3 is a diagram showing calculated values of side lobe characteristics for various mirror surface fixed point arrangements, and FIG. 3 is a diagram showing mirror surface deformation patterns corresponding to side lobe characteristics for various mirror surface fixed point arrangements. 1 connects the mirror surface shell and the truss structure via the mirror surface adjustment mechanism.
A point 2 to be fixed is a mirror surface shell 3 is a truss structure A is an antenna side lobe characteristic when the conventional mirror surface is roughly fixed over the entire surface B is an antenna side lobe characteristic when the conventional mirror surface is densely fixed over the entire mirror surface C is the present invention Antenna side lobe characteristic D of one embodiment D is an antenna side lobe characteristic when the central portion of the mirror surface is densely fixed and the peripheral portion of the mirror surface is roughly fixed. A'is a modification of the antenna mirror surface when roughly fixed over the entire mirror surface. A curve B'indicating a modified example of the antenna mirror surface when the conventional mirror surface is densely fixed over the entire surface is a curve C'indicated by a modified example of the antenna mirror surface of one embodiment of the present invention. Curve that shows a modified example of the antenna mirror surface when the peripheral part of the mirror surface is loosely fixed
Claims (1)
を介して固定するトラス構造アンテナにおいて、前記鏡
面調整機構の配置を鏡面中央部では粗の間隔で配置し、
該鏡面中央部の周りの鏡面周辺部では前記粗の間隔より
密な間隔で配置したことを特徴とするトラス構造アンテ
ナ。1. A truss structure antenna in which a mirror shell is fixed to a truss structure via a plurality of mirror surface adjusting mechanisms, wherein the mirror surface adjusting mechanisms are arranged at a coarse interval in a central portion of the mirror surface,
A truss structure antenna, wherein the mirror surface peripheral portion around the mirror surface central portion is arranged at a denser interval than the rough interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18515086A JPH0716128B2 (en) | 1986-08-08 | 1986-08-08 | Truss structure antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18515086A JPH0716128B2 (en) | 1986-08-08 | 1986-08-08 | Truss structure antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6342204A JPS6342204A (en) | 1988-02-23 |
| JPH0716128B2 true JPH0716128B2 (en) | 1995-02-22 |
Family
ID=16165734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18515086A Expired - Lifetime JPH0716128B2 (en) | 1986-08-08 | 1986-08-08 | Truss structure antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0716128B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2649539B1 (en) * | 1989-07-06 | 1991-11-08 | Yves Devillers | REMOVABLE AND AEROTRANSPORTABLE ANTENNA FOR TWO-WAY TELECOMMUNICATIONS WITH A SATELLITE |
-
1986
- 1986-08-08 JP JP18515086A patent/JPH0716128B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6342204A (en) | 1988-02-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |