JPS60150304A - Disturbing wave suppressing radar system - Google Patents
Disturbing wave suppressing radar systemInfo
- Publication number
- JPS60150304A JPS60150304A JP59006762A JP676284A JPS60150304A JP S60150304 A JPS60150304 A JP S60150304A JP 59006762 A JP59006762 A JP 59006762A JP 676284 A JP676284 A JP 676284A JP S60150304 A JPS60150304 A JP S60150304A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- main antenna
- auxiliary
- antennas
- main
- 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.)
- Granted
Links
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
Abstract
Description
【発明の詳細な説明】
（発明の分野）
本発明は、任意の方向から入射する妨害波、特に広帯域
特性を有する妨害波に対し、自動的にかつ周波数特性と
して広帯域なパターンナルを形成することにより、これ
を抑圧するレーダ方式に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention is directed to automatically forming a pattern with a broadband frequency characteristic for interference waves incident from any direction, especially interference waves having broadband characteristics. Therefore, it relates to a radar system that suppresses this.
（従来技術）
従来レーダの分野において、妨害波抑圧装置としてよく
利用されているサイドロープキャンセラでは、主アンテ
ナと一般にＮ個の補助アンテナを直線上又は主アンテナ
の開口面上で主アンテナの周囲に配置したアンテナ構成
を有している。このようなアンテナ構成では、主アンテ
ナの開口面に対し垂直な方向から到来する妨害波に対し
ては広帯域な抑圧特性が得られるが、一般に斜めな方向
から到来する妨害波に対しては、妨害波の周波数によっ
て主アンテナと補助アンテナとで受信信号の位相差が変
化するため広帯域な抑圧特性が得られないという欠点が
おった。このことを数式を用いて簡単に説明する。(Prior art) In the conventional radar field, a side rope canceller, which is often used as an interference wave suppression device, connects a main antenna and generally N auxiliary antennas around the main antenna in a straight line or on the aperture of the main antenna. It has an antenna configuration. Such an antenna configuration provides broadband suppression characteristics for interference waves arriving from a direction perpendicular to the aperture of the main antenna, but generally suppresses interference waves arriving from an oblique direction. Since the phase difference between the received signals between the main antenna and the auxiliary antenna changes depending on the frequency of the waves, a drawback is that broadband suppression characteristics cannot be obtained. This will be briefly explained using a mathematical formula.
主アンテナでの受信信号をＸｏ（ｔ）、−搬にＮ個の補
助アンテナでの受信信号をｘＫ（ｔ） （Ｋ＝１１−Ｉ
Ｎ）とすると、サイドロープキャンセラの出力信号ｙ（
ｔ）は
ｙ（ｔ）＝、４．ＷＫＸＫ（ｔ）＝Ｗ Ｘ（ｔ）・・・
（１）
Ｗ：重み付は係数ベクトル
Ｘ：受信信号ベクトル
として与えられる。The received signal at the main antenna is Xo(t), and the received signal at the N auxiliary antennas is xK(t) (K=11-I
N), the output signal of the side rope canceller y(
t) is y(t)=,4. WKXK(t)=WX(t)...
(1) W: weighting is given as coefficient vector X: received signal vector.
（１）式において妨害信号を最大限に抑圧する（すなわ
ち、サイドローブキャンセラ出力信号パワーを最小とす
る）ための１み付は係数は、Ｗｏｐｔ−μΦ−Ｉ Ｓ＊
、、、（２゜で与えられることが知られている。In equation (1), the coefficient for maximally suppressing the interference signal (that is, minimizing the sidelobe canceller output signal power) is Wopt-μΦ-IS*
, , (It is known that it is given by 2°.
μ：定数
Φ：入力信号の共分散マトリクス
Ｅ：期待値オペレータ
ここでは、簡単のため補助アンテナが１つの場合を考え
ると、（２）式は
μ′：比例定数
と表わされる。μ: constant Φ: covariance matrix of input signal E: expectation value operator Here, for simplicity, considering the case where there is only one auxiliary antenna, equation (2) is expressed as μ′: proportionality constant.
一般に妨害波が第１図に示すように法線方向からθの角
度で入射するものとし、広帯域妨害信号の簡単々例とし
て、２つの正弦波が合成されている場合を考える。Generally, it is assumed that the interference wave is incident at an angle θ from the normal direction as shown in FIG. 1, and as a simple example of a broadband interference signal, consider the case where two sine waves are synthesized.
入力信号を
Ｘ（ｔ）”ａ Ｉｅｊｗ”＋８２ ｅｊＷ２’ ”’包
）とすると、主アンテナにおける受信信号Ｘｏ（ｔ）
及び補助アンテナでの受信信号ｘＩ（ｔ）は、主アンテ
ナの利得をＧｏ１補助アンテナの利得を０１とすると、
ｘｏ（ｔ）＝Ｇｏ （ａｔ ｅｊＷ１ｔ＋ａ２ ｅｊＷ
２’ ） −（５）ｘ １（ｔ）＝ （ｊ １ （ａＩ
ｅ ｊ（”’ ””＋ａ ２ ｅ ”′ｖ２”Ｍ −（
６）で与えられる１、ここで、φ！、φ２は主アンテナ
の開口面に対して、妨害信号が斜めから入射することに
より生じる位相差であり、次式によって表わされる。If the input signal is X(t)"a Iejw"+82 ejW2'"'hull), the received signal at the main antenna is Xo(t)
And the received signal xI(t) at the auxiliary antenna is xo(t)=Go (at ejW1t+a2 ejW
2' ) −(5)x 1(t)= (j 1 (aI
e j(”' ””+a 2 e ”′v2”M −(
6), where φ! , φ2 is a phase difference caused by the interference signal obliquely entering the aperture of the main antenna, and is expressed by the following equation.
Ｌ：王アンテナと補助アンテナ間の距離このとき（３）
式から最適な重み付は係数はＷｏ＝（ａｌ＋ａ２ ）／
Ｇｏ ・・’（８）Ｗｌ ＝ （ａ：ｅ−”＋ａ：ｅ−
” ’）／Ｇ １ −（９）と１、（ｔ）式から、サイ
ドローブキャンセラ出力ｙ（ｔ）は
ｙ（ｔ）−ａ 、ａ ２゜ （１−ｅ−”φｌ−φ２）
）＋ａ１ａ２ｅ （１−ｅ−１（ｄ＋−４ｚ）） ・・
・（１の２ ｊｗ２ｔ
となる。Ｑｏ）式に２いて、θ＝０のとぎ、φ１＝φ２
＝０となり、すなわち主アンテナ開口面に対し法線方向
から入射する妨害波の場合には、周波＠ｗｔ ＋Ｗ２に
よらず妨害波は除去される。又、一般にθ〆０の場合に
はＷ １ ”” Ｗ ２ならはφ！−φ２となシ、妨害
波除去が可能であることを示しており、θｙＯ，ｗ１．
＃ｗ２の場合（すなわち、広帯域妨害が斜めから入射す
る場合）には妨害波は完全には除去されない。L: Distance between the king antenna and the auxiliary antenna (3)
From the formula, the optimal weighting coefficient is Wo=(al+a2)/
Go...'(8) Wl = (a:e-"+a:e-
"')/G 1 - From (9) and 1, (t), the sidelobe canceller output y(t) is y(t) - a , a 2゜ (1-e-"φl-φ2)
)+a1a2e (1-e-1(d+-4z)) ・・
・(1 of 2 jw2t becomes.Qo) 2 in the equation, θ=0, φ1=φ2
= 0, that is, if the interference wave is incident from the normal direction to the main antenna aperture, the interference wave is removed regardless of the frequency @wt +W2. In addition, in general, if θ〆0, W 1 "" If W 2, φ! -φ2 indicates that interference wave removal is possible, and θyO, w1.
In case #w2 (that is, when broadband interference is incident obliquely), the interference waves are not completely removed.
以上説明してきたように、主アンテナの開口面上主アン
テナの周囲に補助アンテナを配置する従来技術では主ア
ンテナ開口面に対して妨害波が直角方向から入射した場
合には問題ないが、主アンテナ開口面に対して斜め方向
から入射する広帯域の妨害波に対しては、主アンテナと
補助アンテナとで伝搬路長が異なり、それによる位相差
が周波数によって変化するため充分除去できないという
問題点があった。As explained above, with the conventional technology in which auxiliary antennas are placed around the main antenna on the aperture of the main antenna, there is no problem when interference waves are incident from a direction perpendicular to the aperture of the main antenna. The problem with broadband interference waves that are incident obliquely to the aperture surface is that the main antenna and the auxiliary antenna have different propagation path lengths, and the resulting phase difference changes depending on the frequency, making it impossible to sufficiently eliminate them. Ta.
（発明の目的および構成）
本発明は、主アンテナを中心として、補助アンテナを主
アンテナの方位方向ビーム走査面内の周囲に配置するこ
とにより従来のサイドローブキャンセラでは対処できな
かった上記問題点を解決できる方式を提供するものであ
る。(Objective and Structure of the Invention) The present invention solves the above-mentioned problems that could not be solved by conventional sidelobe cancellers by arranging auxiliary antennas around the main antenna in the azimuthal beam scanning plane of the main antenna. It provides a method that can solve the problem.
即ち本発明によれば、広帯域妨害波がどの方向から入射
してきても、主アンテナと補助アンテナを結ぶ線と、妨
害波の入射方向に対し、９０°に近い角度で配置された
主アンテナと補助アンテナの組合せが存在するから、広
帯域特性をもったパターンナルが形成できる。That is, according to the present invention, no matter from which direction broadband interference waves are incident, the line connecting the main antenna and the auxiliary antenna and the line connecting the main antenna and the auxiliary antenna arranged at an angle close to 90° with respect to the direction of incidence of the interference waves. Since there are combinations of antennas, a pattern with broadband characteristics can be formed.
（発明の実施例） 以下本発明の実施例を図面を参照して説明する。(Example of the invention) Embodiments of the present invention will be described below with reference to the drawings.
本発明による、妨害波抑圧レーダ方式の一実施例を説明
する第３図及び第４図におけるアンテナ配置は、第２図
のように配置するものとする。The antenna arrangement in FIGS. 3 and 4 for explaining an embodiment of the interference wave suppression radar system according to the present invention is as shown in FIG. 2.
第３図を用いて妨害波抑圧の実施例を説明する。An example of interference wave suppression will be explained using FIG.
第３図はＮ個の補助アンテナをすべて使って最適重み付
は係数Ｗ。、ｔを計算する方式を説明するための図であ
る。In Figure 3, the optimal weighting is by coefficient W using all N auxiliary antennas. , t is a diagram for explaining a method of calculating.
主アンテナ３００及びＮ個の補助アンテナ３０１〜３Ｏ
Ｎによって受信されたレーダ受信信号Ｘｏ（ｔ）及びＸ
Ｋ（ｔ）（ｋ＝１ ＋２＋−−−＋Ｎ）は、重み付は係
数演算回路３１０に送られて、（２）式に基づき所定の
アルゴリズムに従って最適な止み付は係数が計算される
。乗算器３２０〜３２Ｎは、それぞれ対応した補助アン
テナの受信信号ＸＫ（ｉ） （ｋ＝ １ ＋ −一−＋
Ｎ）に、止み付は係数演算回路３１０から与えらた重み
付は係数Ｗ （１−ＷＮを乗算し、ＷｏＸｏ（ｔ）〜Ｗ
Ｎｘ Ｈ（ｔ）を計算する。そして、加算器３３０にお
い゛で、
ｙ（ｔ）＝ ΣＷＫＸＫ（ｔ）
ｌ（−〇
）演′ｘ７！ｉｌ−行い、出力信号ｙ （ｔ）が出力端
子３４０に得られる。このとき、アンテナの配置は第２
図に示されているように、主アンテナ３００のまわりに
、補助アンテナ３０１〜３ＯＮが主アンテナの方位方向
ビーム走査面内に配置されているから、いかなる方向か
ら入射した妨害波でも対処できる。Main antenna 300 and N auxiliary antennas 301 to 3O
The radar received signals Xo(t) and X received by N
The weighting of K(t) (k=1 +2+---+N) is sent to the coefficient calculation circuit 310, and the optimal stopping coefficient is calculated according to a predetermined algorithm based on equation (2). The multipliers 320 to 32N each receive the received signal XK(i) of the corresponding auxiliary antenna (k=1 + -1-+
N), the weighting given from the coefficient calculation circuit 310 is the coefficient W (multiplying by 1-WN, WoXo(t) ~ W
Calculate Nx H(t). Then, in the adder 330, y(t) = ΣWKXK(t) l(-〇)x7! il-, and an output signal y(t) is obtained at output terminal 340. At this time, the antenna placement is
As shown in the figure, the auxiliary antennas 301 to 3ON are arranged around the main antenna 300 in the beam scanning plane in the azimuth direction of the main antenna, so that interference waves incident from any direction can be dealt with.
もう一つの実施例を、第４図を用いて説明する。Another embodiment will be explained using FIG. 4.
妨害波到来方向検出器４１０は主アンテナ４００におい
て受信された信号を用い、妨害波受信信号強度がアンテ
ナの指向特性に従って変化することをオリ用し、所定の
アルゴリズムに従っ゛Ｃ妨害波の到来方向ヲ扶゛出する
。次に妨害波到来方向に対し、主アンテナと補助アンテ
ナとを結ぶ線が９０°に近い補助アンテナ（一般に複数
）を選択する。このように選択された主アンテナと補助
アンテナからの受信信号を用い、（２）式に基づき、所
定のアルゴリズムに従って重み付は係数演算回路４２０
で最適な重みうけ係数を算定する。この場合選択されな
かった補助アンテナに対しては重みづけ係数を０とする
。乗算器４３０〜４３Ｎは、このようにして与えられた
重み付は係数をそれぞれの入力信号に乗じ、加算器４４
０ですべてを加昇する。The interfering wave arrival direction detector 410 uses the signal received by the main antenna 400, takes advantage of the fact that the received interfering signal strength changes according to the directivity characteristics of the antenna, and detects the arrival direction of the interfering wave according to a predetermined algorithm. I will provide support. Next, auxiliary antennas (generally a plurality of antennas) are selected whose line connecting the main antenna and the auxiliary antenna is close to 90° with respect to the direction in which the interference wave arrives. Using the received signals from the main antenna and auxiliary antenna selected in this way, weighting is performed by the coefficient calculation circuit 420 according to a predetermined algorithm based on equation (2).
Calculate the optimal weighting coefficient. In this case, the weighting coefficient is set to 0 for the auxiliary antenna that is not selected. Multipliers 430 to 43N multiply each input signal by the weighting coefficient given in this way, and adder 44
Increase everything with 0.
（発明の効果）
以上説明してきたように、本発明によれは如何なる方向
から入射する広帯域妨害波に対しても自動的に妨害波到
来方向に広帯域特性をもったパターンナルが形成でき、
妨害波の除去が可能となるという効果がある。(Effects of the Invention) As explained above, according to the present invention, a pattern having broadband characteristics can be automatically formed in the interference wave arrival direction for broadband interference waves incident from any direction.
This has the effect of making it possible to remove interference waves.
第１図はサイドロープキャンセラにおける、従来のアン
テナ配置を説明するだめの図、第２図は本発明における
アンテナ配ｆｄを説明するだめの図、第３図及び第４図
は本発明の詳細な説明するための図でおる。
１００．２００．３００．４００・・・・・・主アンテ
ナ、１０１．２０１〜２ＯＮ、３０１〜３ＯＮ。
４０１〜４ＯＮ・・・・・・補助アンテナ、３１０．４
２０・・・・・・重み付は係数演算回路、３２０〜３２
Ｎ。
４３０〜４３Ｎ・・・・・・乗ｙ器％３３０．４４０・
・・・・・加算器、３４０．４５０・・・・・・出力端
子、４１０・・・・・・妨害波到来方向検出器。
カ？図FIG. 1 is a diagram for explaining the conventional antenna arrangement in a side rope canceller, FIG. 2 is a diagram for explaining the antenna arrangement fd in the present invention, and FIGS. 3 and 4 are detailed diagrams for explaining the antenna arrangement fd in the present invention. This is a diagram for explanation. 100.200.300.400... Main antenna, 101.201-2ON, 301-3ON. 401~4ON・・・Auxiliary antenna, 310.4
20... Weighting is done by coefficient calculation circuit, 320-32
N. 430~43N・・・Multiplier%330.440・
... Adder, 340.450 ... Output terminal, 410 ... Interfering wave arrival direction detector. mosquito? figure
Claims (2)
アンテナを中心とする周囲上に一般にＮ個の補助アンテ
ナを配置したアンテナ構成を有し、前記主アンテナでの
受信信号と、谷補助アンテナでの受信信号とにそれぞれ
所定の１み付は係数を乗じて加算することによシ妨害波
を抑圧することを特徴とする妨害波抑圧レーダ方式。(1) It has an antenna configuration in which N auxiliary antennas are generally arranged around the main antenna within the azimuth direction beam running lock of the main antenna, and the received signal at the main antenna and the valley An interference wave suppression radar system characterized in that interference waves are suppressed by multiplying and adding a predetermined coefficient to a received signal at an auxiliary antenna.
主アンテナを中心とする周囲上に一般にＮ個の補助アン
テナを配置したアンテナ構成を有するとともに妨害波の
到来方向を検出する検出手段を有し、この検出結果に基
づいて妨害波到来方向に対し主アンテナと補助アンテナ
とを結ぶ線とのなす角が９０°に近い補助アンテナ（一
般に複数）を選択し、このように選択された補助アンテ
ナと主アンテナの受信信号に対して所定の重み付は係数
を乗じて加算することにより妨害波を抑圧することを特
徴とする妨害波抑圧レーダ方式。(2) It has an antenna configuration in which N auxiliary antennas are generally arranged around the main antenna in the beam scanning plane in the azimuth direction of the main antenna, and detecting means for detecting the arrival direction of the interference wave. Based on this detection result, an auxiliary antenna (generally multiple) whose angle between the line connecting the main antenna and the auxiliary antenna is close to 90° with respect to the direction of interference wave arrival is selected, and the auxiliary antenna selected in this way is An interference wave suppression radar system characterized in that interference waves are suppressed by multiplying and adding predetermined weighting coefficients to signals received by an antenna and a main antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59006762A JPS60150304A (en) | 1984-01-18 | 1984-01-18 | Disturbing wave suppressing radar system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59006762A JPS60150304A (en) | 1984-01-18 | 1984-01-18 | Disturbing wave suppressing radar system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60150304A true JPS60150304A (en) | 1985-08-08 |
| JPH0441789B2 JPH0441789B2 (en) | 1992-07-09 |
Family
ID=11647183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59006762A Granted JPS60150304A (en) | 1984-01-18 | 1984-01-18 | Disturbing wave suppressing radar system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60150304A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02161375A (en) * | 1988-12-14 | 1990-06-21 | Mitsubishi Electric Corp | Side lobe canceller |
| JPH04117802A (en) * | 1990-09-07 | 1992-04-17 | Mitsubishi Electric Corp | Side lobe canceller |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59210384A (en) * | 1983-05-16 | 1984-11-29 | Oki Electric Ind Co Ltd | Reception system for low frequency signal |
-
1984
- 1984-01-18 JP JP59006762A patent/JPS60150304A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59210384A (en) * | 1983-05-16 | 1984-11-29 | Oki Electric Ind Co Ltd | Reception system for low frequency signal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02161375A (en) * | 1988-12-14 | 1990-06-21 | Mitsubishi Electric Corp | Side lobe canceller |
| JPH04117802A (en) * | 1990-09-07 | 1992-04-17 | Mitsubishi Electric Corp | Side lobe canceller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0441789B2 (en) | 1992-07-09 |
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