JPS6211804B2 - - Google Patents
Info
- Publication number
- JPS6211804B2 JPS6211804B2 JP13132179A JP13132179A JPS6211804B2 JP S6211804 B2 JPS6211804 B2 JP S6211804B2 JP 13132179 A JP13132179 A JP 13132179A JP 13132179 A JP13132179 A JP 13132179A JP S6211804 B2 JPS6211804 B2 JP S6211804B2
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- radio waves
- circuit
- directivity
- polarization
- 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
Links
- 230000010287 polarization Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 2
- 238000002592 echocardiography Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/2605—Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
- H01Q3/2611—Means for null steering; Adaptive interference nulling
- H01Q3/2629—Combination of a main antenna unit with an auxiliary antenna unit
- H01Q3/2635—Combination of a main antenna unit with an auxiliary antenna unit the auxiliary unit being composed of a plurality of antennas
Description
【発明の詳細な説明】
本発明は、レーダアンテナや通信用アンテナ等
の受信時に不要電波を除去するアンテナ方式に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antenna system that removes unnecessary radio waves during reception using a radar antenna, a communication antenna, or the like.
一般に、受信アンテナが、所望の信号以外の不
要電波を受信すると、Ｓ／Ｎの劣化が起こり、不
要電波の電界強度が大きくなると受信機の飽和や
レーダにおいては目標物のない方向にエコーが発
生する等の不都合が生ずる。これを避けるため従
来は、アンテナ指向性を鋭くしたり、サイドロー
プを抑制したアンテナを用いて不要電波を受信し
ないようにしている。あるいは所望信号と不要電
波の周波数は必ずしも同一でないことを利用し
て、相関回路により所望信号と相関のない不要電
波を除去するようにアンテナ指向性を合成するア
ダプテイブアレーを用いている。 In general, when a receiving antenna receives unnecessary radio waves other than the desired signal, the S/N ratio deteriorates, and when the field strength of the unnecessary radio waves increases, the receiver saturates, and radar echoes occur in the direction where there is no target. This may cause inconveniences such as To avoid this, conventional methods have sharpened antenna directivity or used antennas with suppressed side ropes to avoid receiving unnecessary radio waves. Alternatively, by taking advantage of the fact that the frequencies of the desired signal and unnecessary radio waves are not necessarily the same, an adaptive array is used that combines the antenna directivity using a correlation circuit to remove unnecessary radio waves that have no correlation with the desired signal.
これら、従来方式のうち前者は鋭いビームを形
成するためアンテナが大形になること、サイドロ
ープ抑圧のためアンテナ効率が低下することなど
の欠点があつた。また、後者の方法はアンテナは
小形でよいが所望の信号と不要信号が同一である
場合には、本質的に動作せず、不要信号除去が不
可能となる欠点を持つている。 Among these conventional methods, the former has disadvantages such as a large antenna due to the formation of a sharp beam, and a decrease in antenna efficiency due to sidelobe suppression. Furthermore, although the latter method requires a small antenna, it essentially does not work if the desired signal and unnecessary signal are the same, and has the disadvantage that it is impossible to remove the unnecessary signal.
本発明は、上記のような欠点に鑑みてなされた
もので、大形のアンテナを用いることなく、所望
信号と同一周波数の不要電波を除去しようとする
ものである。 The present invention has been made in view of the above-mentioned drawbacks, and is intended to remove unnecessary radio waves having the same frequency as a desired signal without using a large antenna.
以下、図面に従つて本発明の実施例を説明す
る。第１図に本発明の一実施例の構成を示す。同
図において、１は特定の偏波の所望信号を受信す
るアンテナで、その偏波は一般に楕円偏波であ
る。第１図では、アレーアンテナであるが、指向
性にヌルをもつ開口面アンテナでも良い。２は上
記の偏波と直交関係にある偏波を受信するアレー
アンテナである。すなわち１が垂直偏波を受信す
るアンテナならば、２は水平偏波を受信するアン
テナであり、また１が右旋円偏波を受信するアン
テナならば、２は左旋円偏波を受信するアンテナ
である。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of an embodiment of the present invention. In the figure, reference numeral 1 denotes an antenna that receives a desired signal of a specific polarization, and the polarization is generally an elliptical polarization. Although an array antenna is shown in FIG. 1, an aperture antenna with a null in directivity may also be used. 2 is an array antenna that receives polarized waves that are orthogonal to the above polarized waves. In other words, if 1 is an antenna that receives vertically polarized waves, 2 is an antenna that receives horizontally polarized waves, and if 1 is an antenna that receives right-handed circularly polarized waves, 2 is an antenna that receives left-handed circularly polarized waves. It is.
３はアンテナ１の指向性を制御する回路であ
る。３の機能は任意の方向に指向性のヌルを向け
ることにあり、第２図に示す構成例で実現出来
る。４は、アンテナ２に受信される電波の到来方
向を検出する回路であり、アンテナ２を構成する
素子アンテナ間の受信電圧位相差や受信波の時間
差を検出することにより、この回路の機能を実現
出来る。５はアンテナ２に受信される電波の到来
方向に対応した回路３の制御用信号を発生する回
路で、例えば回路３が電圧制御形可変移相器で構
成され、回路４の出力が位相である場合には、位
相と電圧の変換回路であり、良く知られている回
路で実現出来る。 3 is a circuit that controls the directivity of the antenna 1. The function of No. 3 is to direct the directional null in any direction, which can be realized by the configuration example shown in FIG. 4 is a circuit that detects the arrival direction of radio waves received by the antenna 2, and the function of this circuit is realized by detecting the received voltage phase difference between the element antennas that make up the antenna 2 and the time difference of the received waves. I can do it. Reference numeral 5 denotes a circuit that generates a control signal for the circuit 3 corresponding to the arrival direction of radio waves received by the antenna 2. For example, the circuit 3 is composed of a voltage-controlled variable phase shifter, and the output of the circuit 4 is a phase signal. In this case, it is a phase and voltage conversion circuit, which can be realized by a well-known circuit.
次に、上記実施例の動作を図面を用いて説明す
る。第３図において、所望信号１１はθｄの方向
から、不要電波１２はθｕの方向から到来するも
のとする。所望信号の偏波は予め分つているので
アンテナ１の偏波面は所望信号の偏波に合せてお
く。したがつて、アンテナ１の偏波面と直交関係
にある偏波面を持つアンテナ２には所望信号は受
信されない。一方、不要電波の偏波面は、所望信
号の偏波面と完全に同一であることは極めて稀な
ことであるため、アンテナ２には不要電波のみが
受信される。したがつて、回路４によつて検出さ
れる電波の到来方向は、不要電波の到来方向とな
る。回路５は、回路４で検出した不要電波到来方
向にアンテナ１の指向性のヌル方向を向けるため
の制御信号を発生する回路であるから、例えば第
２図の回路３にある可変移相器２１〜２３の移相
量を回路５の出力で制御しアンテナ１の指向性の
ヌル方向を不要電波の到来方向に向けることが出
来る。その結果、第４図に示すようなアンテナ１
の指向性となり、アンテナ１は不要電波１２を受
信しないアンテナとなる。 Next, the operation of the above embodiment will be explained using the drawings. In FIG. 3, it is assumed that the desired signal 11 comes from the direction θd, and the unnecessary radio wave 12 comes from the direction θu. Since the polarization of the desired signal is known in advance, the plane of polarization of the antenna 1 is matched to the polarization of the desired signal. Therefore, the desired signal is not received by the antenna 2, which has a polarization plane that is orthogonal to the polarization plane of the antenna 1. On the other hand, since it is extremely rare for the plane of polarization of unnecessary radio waves to be completely the same as the plane of polarization of the desired signal, the antenna 2 receives only the unnecessary radio waves. Therefore, the arrival direction of the radio waves detected by the circuit 4 is the arrival direction of the unnecessary radio waves. Since the circuit 5 is a circuit that generates a control signal for directing the null direction of the directivity of the antenna 1 toward the arrival direction of the unnecessary radio waves detected by the circuit 4, for example, the variable phase shifter 21 in the circuit 3 in FIG. By controlling the phase shift amount of .about.23 with the output of the circuit 5, it is possible to direct the null direction of the directivity of the antenna 1 toward the arrival direction of unnecessary radio waves. As a result, the antenna 1 as shown in FIG.
The antenna 1 becomes an antenna that does not receive unnecessary radio waves 12.
以上述べたように、本発明によるアンテナ方式
によつて既知の偏波面を持つ所望信号のみを受信
し、それを異なる偏波面を持つ不要電波はたとえ
同一周波数であつても受信しないアンテナが得ら
れＳ／Ｎの良好な受信がなされる。また、電界強
度の大きい不要電波による受信妨害を防ぐことも
出来、受信機の飽和やレーダにおいては主ビーム
以外からの偽のエコーが発生しない等の効果があ
る。 As described above, by using the antenna system according to the present invention, it is possible to obtain an antenna that receives only desired signals with a known polarization plane and does not receive unnecessary radio waves with a different polarization plane even if they have the same frequency. Good S/N reception is achieved. Further, it is possible to prevent reception interference due to unnecessary radio waves having a high electric field strength, and there are effects such as saturation of the receiver and generation of false echoes from sources other than the main beam in radar.
更に、本発明によれば、不要電波を除去するた
めビームを鋭くしたり、サイドロープを抑圧した
りする必要がないため小形で効率の良いアンテナ
を得ることが出来る。 Further, according to the present invention, it is not necessary to sharpen the beam or suppress side lobes in order to remove unnecessary radio waves, so it is possible to obtain a small and efficient antenna.
尚、以上の説明において、アンテナ１はアレー
アンテナで説明したがアレーアンテナに限らず１
個のアンテナでも良い。そのとき回路３は回転台
となり、回路５は回転台の回転角制御信号を出力
する。またアンテナ１とアンテナ２は異なる位置
にあるように図面に記載されているが第５図に示
すように例えばターンスタイルアンテナのような
直交する２偏波が受信可能なアンテナ素子を用い
て同一の位置に配置することも出来る。本発明を
レーダに用いるときには、送信アンテナを別に設
けるか又は送信時には回路５の出力を切り、回路
３を所望のビーム方向に向くようにする。 In the above explanation, the antenna 1 was explained as an array antenna, but it is not limited to an array antenna.
It is also possible to use individual antennas. At that time, the circuit 3 functions as a rotary table, and the circuit 5 outputs a rotation angle control signal for the rotary table. Although antennas 1 and 2 are shown in the drawing as being located at different positions, as shown in Fig. It can also be placed at any location. When the present invention is used in a radar, a transmitting antenna is provided separately, or the output of the circuit 5 is cut off during transmission, so that the circuit 3 is oriented in a desired beam direction.
第１図は、本発明一実施例の構成図、第２図は
第１図の回路３の具体例を示す図、第３図は不要
電波到来方向を示す図、第４図は本発明によるア
ンテナの指向性図、第５図は本発明の他の実施例
の構成図である。
１……受信アンテナ、２……不要電波受信用ア
レーアンテナ、３……アンテナ１の指向性制御回
路、４……不要電波到来方向検出回路、５……不
要電波到来方向に対応する制御信号発生回路、２
１，２２，２３……可変移相器、２４……出力合
成器。
FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a diagram showing a specific example of the circuit 3 in FIG. 1, FIG. 3 is a diagram showing the direction of arrival of unnecessary radio waves, and FIG. The antenna directivity diagram, FIG. 5, is a configuration diagram of another embodiment of the present invention. 1... Receiving antenna, 2... Array antenna for receiving unnecessary radio waves, 3... Directivity control circuit for antenna 1, 4... Unwanted radio wave arrival direction detection circuit, 5... Control signal generation corresponding to the unwanted radio wave arrival direction. circuit, 2
1, 22, 23... variable phase shifter, 24... output combiner.
Claims (1)
ナと、このアンテナの指向性を制御する指向性制
御回路と、前記偏波と直交関係にある偏波面の電
波を受信し複数個の素子アンテナで構成されるア
レーアンテナと、このアレーアンテナで受信され
る電波の到来方向を検出する検出回路と、到来方
向に対応した制御信号を発生し前記指向性制御回
路に供給する回路とを具備し、前記指向性制御回
路により前記アンテナの指向性のヌル方向を前記
アレーアンテナで受信される電波の到来方向に一
致させることを特徴とするアンテナ方式。1 An antenna that receives radio waves with a predetermined polarization plane, a directivity control circuit that controls the directivity of this antenna, and a plurality of element antennas that receive radio waves with a polarization plane that is orthogonal to the polarization. a detection circuit that detects the direction of arrival of radio waves received by the array antenna, and a circuit that generates a control signal corresponding to the direction of arrival and supplies it to the directionality control circuit, 1. An antenna system characterized in that a null direction of the directivity of the antenna is made to coincide with an arrival direction of radio waves received by the array antenna by a polarity control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13132179A JPS5656003A (en) | 1979-10-13 | 1979-10-13 | Antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13132179A JPS5656003A (en) | 1979-10-13 | 1979-10-13 | Antenna system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5656003A JPS5656003A (en) | 1981-05-16 |
| JPS6211804B2 true JPS6211804B2 (en) | 1987-03-14 |
Family
ID=15055213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13132179A Granted JPS5656003A (en) | 1979-10-13 | 1979-10-13 | Antenna system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5656003A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9027668B2 (en) | 2008-08-20 | 2015-05-12 | Foro Energy, Inc. | Control system for high power laser drilling workover and completion unit |
| US9089928B2 (en) | 2008-08-20 | 2015-07-28 | Foro Energy, Inc. | Laser systems and methods for the removal of structures |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07297738A (en) * | 1994-04-22 | 1995-11-10 | Nec Corp | Antenna direction adjustment device |
-
1979
- 1979-10-13 JP JP13132179A patent/JPS5656003A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9027668B2 (en) | 2008-08-20 | 2015-05-12 | Foro Energy, Inc. | Control system for high power laser drilling workover and completion unit |
| US9089928B2 (en) | 2008-08-20 | 2015-07-28 | Foro Energy, Inc. | Laser systems and methods for the removal of structures |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5656003A (en) | 1981-05-16 |
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