JPS5990405A - Side lobe canceller - Google Patents
Side lobe cancellerInfo
- Publication number
- JPS5990405A JPS5990405A JP57200593A JP20059382A JPS5990405A JP S5990405 A JPS5990405 A JP S5990405A JP 57200593 A JP57200593 A JP 57200593A JP 20059382 A JP20059382 A JP 20059382A JP S5990405 A JPS5990405 A JP S5990405A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- band
- amplifier
- output signal
- circuit
- 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.)
- Pending
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
Landscapes
- Radar Systems Or Details Thereof (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、レーダ等の受信装置において、受信アンテナ
のサイドロープより入射する妨害波等の不要電波の影響
を抑圧し、主ロープからの所望信号のみを忠実に再現す
る機能を持つ、サイドローブ・キャンセラの改良に関す
る。[Detailed Description of the Invention] The present invention suppresses the influence of unnecessary radio waves such as interference waves incident from the side ropes of a receiving antenna in a receiving device such as a radar, and faithfully reproduces only the desired signal from the main rope. Concerning improvements to functional sidelobe cancellers.
サイドロープ・キャンセラは主アンテナである受信アン
テナ以外に、無指向性の補助アンテナを一個または複数
個設け、各補助アンテナに対して。In addition to the main receiving antenna, the side rope canceller has one or more omnidirectional auxiliary antennas for each auxiliary antenna.
相関ループが連らなる構成をしており、主アンテナの受
信信号と、各補助アンテナの受信信号の相関値に基づい
て、主アンテナの受信信号におけるサイドロープより入
射する不要電波の推定信号を生成し、これを主アンテナ
の受信信号から減する事によって、出力信号として所望
信号のみを残す機能を持つものである。It has a structure with a series of correlation loops, and based on the correlation value between the received signal of the main antenna and the received signal of each auxiliary antenna, it generates an estimated signal of unnecessary radio waves incident from the side rope of the received signal of the main antenna. However, by subtracting this from the signal received by the main antenna, it has the function of leaving only the desired signal as the output signal.
第1図は、2つの補助アンテナを有するサイドロープ・
キャンセラの回路構成図を示している。Figure 1 shows a side rope antenna with two auxiliary antennas.
A circuit configuration diagram of a canceller is shown.
第1図において、(1)は主アンテナ、 (21,(3
1は補助アンテナである。これらのアンテナで受信され
た信号は1局部発振器(4)と、ミキサt51. (6
)、 (71によシ、中心周波数ω1−ω。(ω工〉ω
。)を持った中間周波数(IP)の信号に変換される。In Figure 1, (1) is the main antenna, (21, (3
1 is an auxiliary antenna. The signals received by these antennas are passed through one local oscillator (4) and mixer t51. (6
), (71, center frequency ω1−ω.(ωwork〉ω
. ) is converted to an intermediate frequency (IP) signal.
ミキサ(6)及び(7)の出力信号の複素色落成分をそ
れぞれXl及びx2と記す。(以下、新たに出現する信
号を表わす記号はすべてその複素色落成分を意味するも
のとする。)′iだ、(8)は2周波数ω工より低い周
波数ω。The complex discoloration components of the output signals of mixers (6) and (7) are denoted as Xl and x2, respectively. (Hereinafter, all symbols representing newly appearing signals shall mean their complex color-degraded components.)'i, (8) is a frequency ω lower than the two-frequency ω.
の正強波を生ずる局部発振器、(9)はミキサである。(9) is a mixer.
これら局部発振器(8)及びミキサ(9)により、主ア
ンテナよりの入力信号は、更に、中心工F周波数ω工、
を待った信号Uに変換される。信号Uのことを主信号と
呼ぶ。また、信号X 1.X2のことを参照信号と呼ぶ
。(IQは加算器であり、主信号Xから。These local oscillators (8) and mixers (9) further convert the input signal from the main antenna into
is converted into signal U. Signal U is called the main signal. Also, signal X1. X2 is called a reference signal. (IQ is an adder, from main signal X.
X中の妨害波信号成分の推定信号yを引き去シ。Subtract the estimated signal y of the interference wave signal component in X.
主信号中に含まれる所望信号成分を残す役割をする。+
111は帯域フィルタであり、中心周波数をω、とする
IF周波数帯の信号のみを通過させ、残差出力信号2を
出力する。残差出力信号2は、妨害波信号成分の推定信
号yを作る時の荷重値を作成する相関ループへの入力と
してフィードバックされる。即ち、相関器(Iり及び0
■により残差出力信号2と、参照信号x1またはX2と
の相関信号を生成し。It serves to leave the desired signal components included in the main signal. +
A bandpass filter 111 passes only signals in an IF frequency band whose center frequency is ω, and outputs a residual output signal 2. The residual output signal 2 is fed back as an input to a correlation loop that creates a weight value when creating the estimated signal y of the interference signal component. That is, the correlator (I and 0
A correlation signal between the residual output signal 2 and the reference signal x1 or X2 is generated by (2).
帯域増幅器(18,Qlによシフイードバックの荷重信
号がWl及びW2が生成される。相関信号は、残差出力
信号2の中心周波数ω工と参照信号X1またはX2の中
心周波数ω1−ω。との差周波数ω。を中心周波数とす
るIF帯域を持っており、従って、相関器aa、 ui
中に使われる狭帯域フィルタ141. +1?)の通過
帯域の中心周波数及び帯域増幅器+11. QIの中心
周波数はω。のものが使われる。このようにして生成さ
れる荷重W1及びW2は2周波数O〕。の狭帯域信号と
なシ、これをミキサ((イ)、01)に入力し。The band amplifier (18, Ql) generates shifted feedback weight signals Wl and W2.The correlation signal is generated by the center frequency ω of the residual output signal 2 and the center frequency ω1-ω of the reference signal X1 or X2. It has an IF band with the center frequency at the difference frequency ω. Therefore, the correlators aa, ui
A narrowband filter 141. +1? ) passband center frequency and band amplifier +11. The center frequency of QI is ω. are used. The loads W1 and W2 generated in this way have two frequencies O]. input the narrowband signal to the mixer ((A), 01).
参照信号x1及びx2と混合し、加算器(ハ)により混
合された信号を加えることにより、主信号X中の妨害波
成分の推定信号yが生成される。以上の動作を説明する
ために、ベクトル
X−〔xl、x2〕”・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・(1,I
W−〔w4.W2〕T・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・(2)を
定義すると、Wに関して次のような微分方程式%式%
(3)
但し、(3)式において71gはそれぞれ狭帯域フィル
タ0→、(Iηの時定数及び帯域増幅器01. (11
のゲインである。荷重が一定値に収束した後の収束値は
。An estimated signal y of the interference wave component in the main signal X is generated by mixing it with the reference signals x1 and x2 and adding the mixed signal by an adder (c). In order to explain the above operation, vector X-[xl, x2]”
・・・・・・・・・・・・・・・・・・・・・(1,I
W-[w4. W2〕T・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・ When (2) is defined, the following differential equation for W is obtained. (3) However, in equation (3), 71g are the narrowband filter 0→, (Iη time constant and bandpass amplifier 01. (11
is the gain of The convergence value after the load converges to a constant value is.
次のようになる。It will look like this:
w = g (工+gR) dL・・・・・・・・
・・・・・・・・・・・・・・・・・・・(4)但し、
(4)式において、 dLはuXの平装置、RはxX
*の平均値である。w = g (engine + gR) dL・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・(4) However,
In equation (4), dL is the square unit of uX, R is xX
*This is the average value.
さて、第1図において、帯域増幅器OQ及びQlのゲイ
ンgが同じ値でg〉1であれば
W=R’dL・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・・
・(5)という最適解が得られる。ところが、帯域増幅
器部。Now, in Fig. 1, if the gains g of the band amplifiers OQ and Ql are the same value and g>1, then W=R'dL...
・・・・・・・・・・・・・・・・・・・・・・・・
- The optimal solution (5) is obtained. However, the band amplifier section.
(11の特性が異なシアゲインが異なった値となる場合
には必ずしも荷重な(5)のような最適解になるとは限
らない。(If the shear gains with different characteristics in 11 have different values, the optimal solution such as load (5) is not necessarily obtained.
本発明は、サイドローブ・キャンセラにおける以上の欠
点を解決するために、第2図のように残差出力信号2を
フィードバックする最初の地点(即ち相関器tta、
(1!9に入力する以前の地点)で(ハ)のような帯域
増幅器を挿入し、第1図における帯域増幅器H,(11
を取シ去った構造としたものである。当然の事ながら、
残差出力信号2の中心周波数はω、であるから、帯域増
幅器(ハ)の通過周波数は、中心周波数をω工とするI
F帯域である。In order to solve the above-mentioned drawbacks in the sidelobe canceller, the present invention provides the first point (i.e., the correlator tta,
Insert a band amplifier like (c) at (the point before inputting to 1!9), and band amplifier H, (11
It has a structure that removes the elements. Naturally,
Since the center frequency of the residual output signal 2 is ω, the pass frequency of the band amplifier (c) is I, where the center frequency is ω.
This is the F band.
このようにすることにより、複数個の相関ループにおけ
る帯域増幅器は1個で済ます事ができるため、第1図に
おけるような帯域増幅器間のゲインの調整を行う必要が
なく2回路の調整が容易となるだけでなく2回路構成上
も簡単になり、低価格にて回路が実現できる。By doing this, only one band amplifier is required for multiple correlation loops, so there is no need to adjust the gain between the band amplifiers as shown in Figure 1, making it easy to adjust the two circuits. Not only that, but the two-circuit configuration is also simplified, and the circuit can be realized at a low cost.
以上のように2本発明に関るサイドローブ・キャンセラ
では、帯域増幅器の数を1個に減する事によって2回路
の調整を容易にし、構成を簡単にする事ができる。As described above, in the sidelobe canceller according to the present invention, by reducing the number of bandpass amplifiers to one, adjustment of the two circuits can be facilitated and the configuration can be simplified.
第1図は、主アンテナと2個の補助アンテナ。
2個の相関ループを有し相関ループ中の荷重W1W2を
生成する直前に帯域増幅器を有する従来のサイドローブ
・キャンセラの回路構成図、第2図は。
本発明のサイドローブ・キャンセラの回路構成図で、上
述の帯域増幅器を取り去り2代わりに残差出力信号を相
関ループに入力する直前に帯域増幅器を挿入したもので
ある。
図において、(I)は主アンテナ、 (21,(31は
補助アンテナ、 (41,(8)は局部発振器、 (5
1,(6)、 (刀、(9)。
(1渇、 f16)、(イ)、 (2+1はミキサ、t
ll、(2)は加算器、IはIF通過の帯域フィルタ、
(+3. (i!9は相関器、 Q4)、αηは相関
器中で使用される狭帯域フィルタ、 (II、 Qlは
、中心周波数ω。の帯域増幅器、(2漕は中心周波数ω
工の帯域増幅器である。尚2図中同一あるいは相当部分
には同一符号を付して示しである。
代理人 葛野信−
(7)
第1図Figure 1 shows the main antenna and two auxiliary antennas. FIG. 2 is a circuit diagram of a conventional sidelobe canceller having two correlation loops and a bandpass amplifier immediately before generating the load W1W2 in the correlation loop. This is a circuit configuration diagram of the sidelobe canceller of the present invention, in which the above-mentioned band amplifier is removed and a band amplifier is inserted instead just before inputting the residual output signal to the correlation loop. In the figure, (I) is the main antenna, (21, (31 is the auxiliary antenna, (41, (8) is the local oscillator, (5
1, (6), (sword, (9). (1 thirst, f16), (a), (2+1 is mixer, t
ll, (2) is an adder, I is a bandpass filter for passing IF,
(+3. (i!9 is the correlator, Q4), αη is the narrowband filter used in the correlator, (II, Ql is the bandpass amplifier with center frequency ω, (2 rows is the center frequency ω)
This is an engineered band amplifier. In the two figures, the same or corresponding parts are designated by the same reference numerals. Agent Makoto Kuzuno (7) Figure 1
Claims (1)
した受信信号を入力信号とし、主アンテナのサイドロー
プ方向から入射する妨害波の影響を抑圧し、主アンテナ
のメインローブ方向からの信号のみを出力するサイドロ
ーブ・キャンセラにおいて、サイドローブ・キャンセラ
の出力信号を帯域増幅器に入力するとともにその帯域増
幅器からの出力信号と、補助アンテナの受信信号を相関
器に入力し、相関器からの出力信号と補助アンテナの受
信信号を直接ミキサに入力し、ミキサの出力信号を主ア
ンテナからの入力信号から減算するような回路によって
相関ループを構成した事を特徴とするサイドローブ・キ
ャンセラ。The input signal is the received signal received by the main antenna and one or more auxiliary antennas, suppresses the influence of interference waves incident from the side lobe direction of the main antenna, and outputs only the signal from the main lobe direction of the main antenna. In a sidelobe canceller that performs A sidelobe canceller characterized in that a correlation loop is constructed by a circuit that directly inputs the received signal of the antenna to a mixer and subtracts the output signal of the mixer from the input signal from the main antenna.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57200593A JPS5990405A (en) | 1982-11-16 | 1982-11-16 | Side lobe canceller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57200593A JPS5990405A (en) | 1982-11-16 | 1982-11-16 | Side lobe canceller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5990405A true JPS5990405A (en) | 1984-05-24 |
Family
ID=16426925
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57200593A Pending JPS5990405A (en) | 1982-11-16 | 1982-11-16 | Side lobe canceller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5990405A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005241418A (en) * | 2004-02-26 | 2005-09-08 | Tech Res & Dev Inst Of Japan Def Agency | Radar device |
-
1982
- 1982-11-16 JP JP57200593A patent/JPS5990405A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005241418A (en) * | 2004-02-26 | 2005-09-08 | Tech Res & Dev Inst Of Japan Def Agency | Radar device |
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