JPH05180932A - Monopulse radar equipment - Google Patents
Monopulse radar equipmentInfo
- Publication number
- JPH05180932A JPH05180932A JP3360190A JP36019091A JPH05180932A JP H05180932 A JPH05180932 A JP H05180932A JP 3360190 A JP3360190 A JP 3360190A JP 36019091 A JP36019091 A JP 36019091A JP H05180932 A JPH05180932 A JP H05180932A
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- JP
- Japan
- Prior art keywords
- difference
- sum
- signal
- output
- phase
- 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.)
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- Radar Systems Or Details Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、モノパルスレーダ装置
に関し、特に和、差のアンテナパターンを用いるモノパ
ルス測角において、和、差受信信号各々のバラツキによ
る測角誤差を自動的に補正する補正回路を備えたモノパ
ルスレーダ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monopulse radar device, and in particular, in a monopulse angle measurement using an antenna pattern of a sum and a difference, a correction circuit for automatically correcting an angle measurement error due to variations in each of the sum and difference received signals. The present invention relates to a monopulse radar device equipped with.
【０００２】[0002]
【従来の技術】従来、この種の和、差アンテナパターン
を用いるモノパルスレーダ装置においては、ビームノー
ズの左右（以降、象限と呼ぶ。）を判定するために、図
５に示すようにモノパルス空中線１からの和、差各々の
受信信号に１対１に対応した、各受信信号を増幅し位相
検波することによりビデオ信号（Ｉビデオ）及びＩビデ
オの直交位相検波成分信号（Ｑビデオ）を出力する受信
装置２と、このＩ，Ｑビデオ信号を各々ディジタル信号
に変換するＡ／Ｄ変換器３と、Ａ／Ｄ変換器３からのデ
ィジタルＩ，Ｑビデオ信号出力を入力として受信信号の
振幅値を算出するＩ／Ｑ合成器２０１及びＩ，Ｑ信号が
成す位相角を算出する位相角算出器２０２と、和、差各
々の位相角を入力として和差の位相角の差を算出し象限
を判定する象限判定器２０３と、和、差各々の振幅値を
入力として和差の振幅比を算出する振幅比算出器２０４
を有する。ここで、位相角算出器２０２はｔａｎ-1（Ｑ
／Ｉ）を算出する必要があるが、ｔａｎ-1の算出には関
数近似を用いる必要がありレーダー信号処理のようにリ
アルタイム処理が必要な用途では、実現が困難である。
このため、通常ｔａｎ-1の算出には、予めｔａｎ-1の値
を算出しておきテーブルとして参照する、テーブル・ル
ックアップ回路が用いられる。また、象限の判定は、図
４に示すように和、差の受信信号の位相が、和ビームの
ビームノーズを境として逆相になることを利用し、和差
の位相差がほぼゼロの場合（和差同相の場合）ビームノ
ーズの右、和差の位相差がほぼ 180°の場合（和差逆相
の場合）ビームノーズの左と判断する。2. Description of the Related Art Conventionally, in a monopulse radar apparatus using this kind of sum and difference antenna pattern, a monopulse antenna 1 as shown in FIG. 5 is used to determine the left and right of the beam nose (hereinafter referred to as quadrant). Each of the sum signal and the difference signal from (1) corresponds to the one-to-one correspondence with the received signal, and the received signal is amplified and phase-detected to output a video signal (I-video) and a quadrature-phase detected component signal (Q-video) of the I-video. The receiver 2 and the A / D converter 3 for converting the I and Q video signals into digital signals respectively, and the digital I and Q video signal outputs from the A / D converter 3 as inputs, The I / Q combiner 201 for calculating and the phase angle calculator 202 for calculating the phase angle formed by the I and Q signals, and the phase angle of the sum and difference are input to calculate the difference between the phase angles of the sum and difference to determine the quadrant. Quadrant A vessel 203, amplitude ratio calculator calculates the amplitude ratio of the sum and difference sum, the difference each amplitude value as an input 204
Have. Here, the phase angle calculator 202 determines that tan −1 (Q
/ I) needs to be calculated, but it is difficult to realize tan −1 in applications that require real-time processing, such as radar signal processing.
Therefore, the calculation of the normal tan -1, referred to as a table in advance by calculating the value of the advance tan -1, table lookup circuit is used. Further, as shown in FIG. 4, the quadrant determination uses the fact that the phases of the received signals of the sum and the difference are opposite to each other with the beam nose of the sum beam as a boundary. (In the case of the sum difference in-phase) It is judged as the right of the beam nose, and when the phase difference of the sum difference is approximately 180 ° (in the case of the sum difference opposite phase) it is judged as the left of the beam nose.
【０００３】一方、この象限の判定に際し、和、差各々
で受信装置が異なり、お互いの受信装置のバラツキのた
めに、空中線においてはほぼゼロであった和、差信号の
位相差が、受信装置出力ではゼロとならなくなる。この
ため、空中線出力に基準信号を重畳し、この基準信号に
対する受信装置出力での和、差の位相差を補正値として
受信装置において差信号の位相を移相器により補正値分
移相させることにより、このバラツキによる誤差の補正
を行っていた。On the other hand, in the determination of this quadrant, the receiving devices are different depending on the sum and the difference, and due to the variations of the receiving devices, the phase difference between the sum and the difference signals, which was almost zero in the antenna, is the receiving device. The output will never be zero. For this reason, the reference signal is superimposed on the antenna output, and the phase difference of the difference signal is shifted by the phase shifter in the receiving device using the phase difference of the sum and difference at the output of the receiving device with respect to this reference signal as the correction value. Therefore, the error due to this variation is corrected.
【０００４】[0004]
【発明が解決しようとする課題】このような従来の移相
器による位相の補正方式では、移相器が位相を移相させ
ることのできる最小の単位（分解能と呼ぶ。）を小さく
することが困難（アナログ信号の位相を移相させるため
には、所定の分解能相当の移相量を持った基本移相器
を、必要な移相量が得られるまで、縦続接続する。この
ため、分解能を小さくすれば必要な縦続接続数が多くな
るため規模が大きくなり、実現が困難になる。）なた
め、算出した補正値の変動により移相量が変動する場合
が生じる。近年のドップラ処理を行うレーダー処理にお
いては、このような位相の変動は処理誤差となるため、
許容できない。In such a conventional phase correction method using a phase shifter, it is possible to reduce the minimum unit (called resolution) by which the phase shifter can shift the phase. Difficult (In order to shift the phase of analog signals, basic phase shifters with a phase shift amount equivalent to a predetermined resolution are cascaded until the required phase shift amount is obtained. If it is made small, the number of cascade connections required becomes large and the scale becomes large, which makes it difficult to realize.) Therefore, the amount of phase shift may change due to the change in the calculated correction value. In radar processing that performs Doppler processing in recent years, such phase fluctuations cause processing errors.
Unacceptable.
【０００５】このため、Ａ／Ｄ変換後ディジタル処理に
より補正値の算出及び補正処理を行う方法が考えられて
いる。しかしこの場合には、補正処理のため、いわゆる
複素乗算処理が必要（位相検波後のＩ，Ｑ信号は直交信
号であり、処理上は複素数として取り扱われる。）であ
り、回路構成が複雑となる問題点があった（複素乗算で
あり、乗算器４個、加算器２個必要である。）。Therefore, a method of calculating and correcting a correction value by digital processing after A / D conversion has been considered. However, in this case, so-called complex multiplication processing is necessary for correction processing (I and Q signals after phase detection are quadrature signals, and are treated as complex numbers in processing), and the circuit configuration becomes complicated. There was a problem (complex multiplication requires 4 multipliers and 2 adders).
【０００６】[0006]
【発明の目的】本発明は、かかる従来例の有する不都合
を改善し、とくに、空中線からの和又は差の受信信号の
バラツキに対する補正を容易になし得るモノパルスレー
ダ装置を提供することを、その目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a monopulse radar device which improves the disadvantages of the conventional example, and in particular can easily correct the variation of the received signal of the sum or the difference from the antenna. And
【０００７】[0007]
【課題を解決するための手段】本発明では、和又は差ア
ンテナパターンを用いてモノパルス測角を行うモノパル
スレーダ装置において、前記モノパルス空中線からの和
又は差の各受信信号に基準信号を重畳する基準信号合成
器と、前記各受信信号に１対１に対応して、各受信信号
を位相検波しビデオ信号（Ｉビデオ）及びこのＩビデオ
の直交位相検波成分信号（Ｑビデオ）を出力する受信装
置と、このＩ，Ｑビデオ信号を各々ディジタル信号に変
換するＡ／Ｄ変換器と、このＡ／Ｄ変換器からのディジ
タルＩ，Ｑビデオ信号出力を入力として各々の絶対値
Ｉ ， Ｑ を算出する絶対値算出器と、この絶対値に
重み付け係数を乗じた後お互いを加算する複数の重み付
け演算器と、前記複数の重み付け演算器出力より最大値
を選択する比較選択器と、この比較選択器がどの重み付
け演算回路の出力を選択したかを出力する比較判定結果
出力器と、前記絶対値回路の入力であるＩ，Ｑビデオ信
号各々の符号を判定する符号判定器と、和又は差各々の
前記比較判定結果出力器の出力と前記符号判定器の出力
とを入力として和又は差信号の位相差を算出する位相差
算出器と、前記基準信号が重畳されている時に前記基準
信号に対する前記位相差算出器の出力を記憶する記憶器
と、前記位相差算出器出力に前記記憶出力を加算または
減算する加減算器と、前記加減算器出力より和又は差受
信信号が成す位相角の象限判定を行う象限判定器と、和
又は差各々の振幅値を入力として和差の振幅比を算出す
る振幅比算出器とを備える、という構成をとっている。
これによって前述した目的を達成しようとするものであ
る。According to the present invention, in a monopulse radar device for performing monopulse angle measurement using a sum or difference antenna pattern, a reference for superposing a reference signal on each sum or difference received signal from the monopulse antenna. A signal synthesizer and a receiving device for phase-detecting each received signal in a one-to-one correspondence with each received signal and outputting a video signal (I video) and a quadrature-phase detected component signal (Q video) of this I video. And an A / D converter for converting each of the I and Q video signals into a digital signal, and an absolute value of each of the digital I and Q video signals output from the A / D converter as inputs.
An absolute value calculator for calculating I and Q; a plurality of weighting calculators for multiplying the absolute values by weighting coefficients and adding each other; and a comparison selector for selecting the maximum value from the plurality of weighting calculator outputs. A comparison judgment result output device for outputting which weighting operation circuit the comparison selector has selected, and a code judgment device for judging the sign of each of the I and Q video signals input to the absolute value circuit, A phase difference calculator that calculates the phase difference of the sum or difference signal by using the output of the comparison determination result output unit of the sum or the difference and the output of the code determination unit as input, and the phase difference calculator when the reference signal is superimposed. A memory for storing the output of the phase difference calculator with respect to a reference signal, an adder / subtractor for adding or subtracting the memory output to the output of the phase difference calculator, and a phase angle formed by a sum or difference received signal from the adder / subtractor output of A quadrant determiner for performing limited determination, and a magnitude ratio calculator that calculates an amplitude ratio of the sum and difference as an input an amplitude value of the sum or difference respectively, taking a configuration that.
This aims to achieve the above-mentioned object.
【０００８】[0008]
【実施例】次に、本発明について図面を参照して説明す
る。図１に本発明の一実施例を示す。この図１に示す実
施例は、モノパルス空中線１からの和，差各々の受信信
号に基準信号を重畳する基準信号合成器２と、和，差各
々の受信信号に１対１に対応し各受信信号を増幅し位相
検波することによりビデオ信号（Ｉビデオ）及びＩビデ
オの直交位相検波成分信号（Ｑビデオ）を出力する受信
装置３とを備えている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention. The embodiment shown in FIG. 1 includes a reference signal synthesizer 2 for superposing a reference signal on the received signals of the sum and the difference from the monopulse antenna 1 and one-to-one correspondence with the received signals of the sum and the difference. A receiver 3 for outputting a video signal (I video) and a quadrature phase detection component signal (Q video) of the I video by amplifying the signal and performing phase detection.
【０００９】更に、このＩ，Ｑビデオ信号を各々ディジ
タル信号に変換するＡ／Ｄ変換器４と、Ａ／Ｄ変換器か
らのディジタルＩ，Ｑビデオ信号出力を入力として受信
信号の振幅値（すなわち●（Ｉ2 ＋Ｑ2 ））を算出する
近似式「Ａ Ｉ ＋Ｂ Ｑ」においてＩ，Ｑ各々の絶対
値を算出する絶対値算出器１０１，１０２と、（Ａ，
Ｂ）の組として（１，１／８），（７／８，１／２），
（１／２，７／８），（１／８，１），（４５／６４，
４５／６４）の重み付けを前記絶対値算出器１０１，１
０２出力に行う重み付け演算器１０３〜１０７とを備え
ている。Further, the A / D converter 4 for converting the I and Q video signals into digital signals respectively, and the digital I and Q video signal outputs from the A / D converter as inputs, the amplitude value of the received signal (ie, ● Absolute value calculators 101 and 102 for calculating absolute values of I and Q respectively in an approximate expression “A I + B Q” for calculating (I 2 + Q 2 ), and (A,
As a set of B), (1, 1/8), (7/8, 1/2),
(1/2, 7/8), (1/8, 1), (45/64,
45/64) is assigned to the absolute value calculators 101, 1
The weighting calculators 103 to 107 for the 02 output are provided.
【００１０】また、更に、この５個の重み付け演算器出
力を各々２個づつ，すなわち（１，１／８）の重み付け
を行う重み付け演算器１０３出力と（７／８，１／２）
の重み付けを行う重み付け演算器１０４出力とを比較し
大きな方を出力する比較選択器１１１と、（１／２，７
／８）の重み付けを行う重み付け演算器１０５出力と
（１／８，１）の重み付けを行う重み付け演算器１０６
出力とを比較し大きな方を出力する比較選択器１１２
と、（４５／６４，４５／６４）の重み付けを行う重み
付け演算器１０７出力と前記比較選択器１１１出力とを
比較し大きな方を出力する比較選択器１１３と、前記比
較選択器１１２出力と前記比較選択器１１３出力とを比
較し大きな方を出力する比較選択器１１４とを備えてい
る。Further, each of the outputs of the five weighting calculators is two, that is, the output of the weighting calculator 103 for weighting (1, 1/8) and (7/8, 1/2).
A comparison selector 111 for comparing the output of the weighting calculator 104 for weighting
/ 8) weighting calculator 105 output and (1/8, 1) weighting calculator 106
Comparison selector 112 that compares the output with the larger one
And a comparison selector 113 for comparing the output of the weighting calculator 107 for weighting (45/64, 45/64) with the output of the comparison selector 111, and the output of the comparison selector 112 and the output of the comparison selector 112. It is provided with a comparison selector 114 that compares the output of the comparison selector 113 and outputs the larger one.
【００１１】そして、前記比較選択器１１１〜１１４が
どちらかの入力を選択したか（すなわちどの（Ａ，Ｂ）
の組が選択されたか）を出力する比較判定結果出力器１
２１〜１２４と、前記絶対値算出器１０１，１０２の入
力であるＩ，Ｑ信号の符号を判定する符号判定器１３
１，１３２と、和，差各々の前記比較判定結果出力器の
出力と前記符号判定器の出力とを入力とし和，差信号の
位相差を算出する位相差算出器１４０と、前記基準信号
が重畳されている時に基準信号に対する位相差算出器１
４０の出力を記憶する記憶器１４１と、前記位相差算出
器１４０出力に記憶器１４１出力を加算または減算する
加減算器１４２と、加減算器１４２出力より和，差受信
信号が成す位相角の象限判定を行う象限判定器１５０
と、和，差各々の振幅値（前記比較選択器１１４出力）
を入力として和差の振幅比を算出する振幅比算出器１５
０とを備えている。Then, which input is selected by the comparison selectors 111 to 114 (that is, which (A, B))
Comparison result output device 1 for outputting
21 to 124, and a code determiner 13 for determining the signs of the I and Q signals input to the absolute value calculators 101 and 102.
1, 132, and a phase difference calculator 140 for calculating the phase difference between the sum and difference signals with the output of the comparison judgment result output unit for the sum and the difference and the output of the sign judgment unit as inputs, and the reference signal. Phase difference calculator 1 for the reference signal when superposed
40, a memory 141 for storing the output of 40, an adder / subtractor 142 for adding or subtracting the output of the memory 141 to the output of the phase difference calculator 140, and a quadrant determination of the phase angle formed by the sum and difference received signals from the output of the adder / subtractor 142 Quadrant determiner 150
And sum and difference amplitude values (output of the comparison selector 114)
Amplitude ratio calculator 15 that calculates the amplitude ratio of the sum difference by inputting
It has 0 and.
【００１２】ここで上記の角（Ａ，Ｂ）の組は、位相角
の変化につれて順次最大値を与える。すなわち、（１，
１／８）は（０°〜18.4°）、（７／８，１／２）は
（18.4°〜40.2°）、（４５／６４，４５／６４）は
（40.2°〜49.8°）、（１／２，７／８）は（49.8°〜
71.6°）、（１／８，１）は（71.6°〜90°）の範囲
で、各々前記近似式「Ａ Ｉ ＋Ｂ Ｑ 」出力の最大
値を与える係数となる（ここで、本近似式による振幅値
の値については、実用新案・直交信号合成器（56−0479
95）に詳しい）。Here, the set of angles (A, B) sequentially gives maximum values as the phase angle changes. That is, (1,
(1/8) is (0 ° to 18.4 °), (7/8, 1/2) is (18.4 ° to 40.2 °), (45/64, 45/64) is (40.2 ° to 49.8 °), ( 1/2, 7/8) is (49.8 ° ~
71.6 °) and (1 / 8,1) are coefficients in the range of (71.6 ° to 90 °) that give the maximum value of the output of the approximate expression “A I + B Q” (where, by this approximate expression) Regarding the value of the amplitude value, the utility model / quadrature signal synthesizer (56-0479
95) detailed).
【００１３】したがって、前記の比較判定結果出力器１
２１〜１２４と符号判定器１３１，１３２とを組み合わ
せることにより、Ｉ，Ｑ信号が成す位相角（正確には、
360度を20個に分割した中のどれか）を判定することが
できる。和，差各々のこの位相角判定結果を元に和，差
各々の差が、所定の値以下であれば和差同相、所定の値
以上であれば和差逆相とすることにより、象限判定が行
われる。この象限判定において、和，差信号間にバラツ
キがあると、和，差信号が成す位相角がこのバラツキ分
誤差を含むことになる。Therefore, the comparison / determination result output device 1 described above is used.
By combining 21 to 124 and the code determiners 131 and 132, the phase angle formed by the I and Q signals (more accurately,
Any of the 360 degrees divided into 20) can be determined. Based on the phase angle judgment results of the sum and the difference, if the difference between the sum and the difference is less than or equal to a predetermined value, the sum / difference in-phase is performed, and if the difference is more than or equal to the predetermined value, the sum / difference reverse phase is used to determine the quadrant. Is done. In this quadrant determination, if there is a variation between the sum and difference signals, the phase angle formed by the sum and difference signals will include this variation error.
【００１４】したがって、この誤差を取り除くため基準
信号を基準信号合成器に入力し、この基準信号に対する
和，差の位相差の理論値（例えば、基準信号として和，
差同相となる信号を与えれば、位相差はゼロとなる。）
からのズレを補正値として記憶器１４１から出力し、加
減算器１４２にて補正を行う。Therefore, in order to remove this error, the reference signal is input to the reference signal synthesizer, and the theoretical value of the phase difference between the sum and the difference with respect to this reference signal (for example, the sum as the reference signal,
If signals with different in-phase are given, the phase difference becomes zero. )
The deviation from is output as a correction value from the storage unit 141, and the addition / subtraction unit 142 corrects it.
【００１５】次に、第２の実施例を図２に示す。この第
２実施例は、図１の実施例のＡ／Ｄ変換器４と絶対値算
出器１０１，１０２との間に、信号処理器１６０を有す
る。この信号処理器１６０は、受信信号のドップラ情報
を用いて不要信号の抑圧あるいは雑音信号に対する信号
強度比の改善を行う。位相補正及び象限判定は、この信
号処理後の信号に対し行われる。ここでの補正の分解能
はあまり高くないが、信号処理を行った後での処理であ
り、かつ、象限判定を行うときのみ実施される処理であ
り、信号処理に与える影響は問題とならない。Next, a second embodiment is shown in FIG. The second embodiment has a signal processor 160 between the A / D converter 4 and the absolute value calculators 101 and 102 of the embodiment shown in FIG. The signal processor 160 suppresses unnecessary signals or improves the signal strength ratio with respect to noise signals by using Doppler information of received signals. Phase correction and quadrant determination are performed on the signal after this signal processing. Although the resolution of the correction here is not so high, it is the processing after the signal processing is performed and is the processing performed only when the quadrant determination is performed, and the influence on the signal processing does not pose a problem.
【００１６】[0016]
【発明の効果】以上説明したように本発明は、Ｉ／Ｑ合
成における近似計算を利用することにより、簡単な回路
でかつ和，差各受信装置間のバラツキの補正も容易に実
現可能であり、かつ信号処理への影響も回避可能とな
る、という従来にない優れたモノパルスレーダ装置を提
供することができる。As described above, according to the present invention, by using the approximate calculation in the I / Q combination, it is possible to easily realize the correction of the variation between the sum and difference receiving devices with a simple circuit. In addition, it is possible to provide an unprecedented excellent monopulse radar device in which the influence on the signal processing can be avoided.
【図１】本発明の一実施例を示す系統図である。FIG. 1 is a system diagram showing an embodiment of the present invention.
【図２】本発明の第２の実施例を示す系統図である。FIG. 2 is a system diagram showing a second embodiment of the present invention.
【図４】和，差受信信号の位相関係の一例を示す説明図
である。FIG. 4 is an explanatory diagram showing an example of a phase relationship between sum and difference received signals.
【図５】従来例におけるモノパルス測角回路を示す系統
図である。FIG. 5 is a system diagram showing a monopulse angle measuring circuit in a conventional example.
１ モノパルス空中線 ２ 基準信号合成器 ３ 受信機 ４ Ａ／Ｄ変換器 １０１，１０２ 絶対値算出器 １０３〜１０７ 重み付け演算器 １１１〜１１４ 比較選択器 １２１〜１２４ 比較判定結果出力器 １３１，１３２ 符号判定器 １４０ 象限判定器 １５０ 振幅比算出器 １６０ 信号処理器 ２０１ Ｉ／Ｑ合成器 ２０２ 位相角算出器 ２０３ 象限判定器 ２０４ 振幅比算出器 ３０１ 和受信信号 ３０２ 差受信信号 DESCRIPTION OF SYMBOLS 1 monopulse antenna 2 reference signal synthesizer 3 receiver 4 A / D converter 101, 102 absolute value calculator 103-107 weighting calculator 111-114 comparison selector 121-124 comparison determination result output device 131, 132 code determiner 140 quadrant determiner 150 amplitude ratio calculator 160 signal processor 201 I / Q combiner 202 phase angle calculator 203 quadrant determiner 204 amplitude ratio calculator 301 sum received signal 302 difference received signal
【手続補正書】[Procedure amendment]
【提出日】平成４年１２月１１日[Submission date] December 11, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】発明の詳細な説明[Name of item to be amended] Detailed explanation of the invention
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、モノパルスレーダ装置
に関し、特に和、差のアンテナパターンを用いるモノパ
ルス測角において、和、差受信信号各々のバラツキによ
る測角誤差を自動的に補正する補正回路を備えたモノパ
ルスレーダ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monopulse radar device, and in particular, in a monopulse angle measurement using an antenna pattern of a sum and a difference, a correction circuit for automatically correcting an angle measurement error due to variations in each of the sum and difference received signals. The present invention relates to a monopulse radar device equipped with.
【０００２】[0002]
【従来の技術】従来、この種の和、差アンテナパターン
を用いるモノパルスレーダ装置においては、ビームノー
ズの左右（以降、象限と呼ぶ。）を判定するために、図
５に示すようにモノパルス空中線１からの和、差各々の
受信信号に１対１に対応した、各受信信号を増幅し位相
検波することによりビデオ信号（Ｉビデオ）及びＩビデ
オの直交位相検波成分信号（Ｑビデオ）を出力する受信
装置２と、このＩ，Ｑビデオ信号を各々ディジタル信号
に変換するＡ／Ｄ変換器３と、Ａ／Ｄ変換器３からのデ
ィジタルＩ，Ｑビデオ信号出力を入力として受信信号の
振幅値を算出するＩ／Ｑ合成器２０１及びＩ，Ｑ信号が
成す位相角を算出する位相角算出器２０２と、和，差各
々の位相角を入力として和差の位相角の差を算出し象限
を判定する象限判定器２０３と、和，差各々の振幅値を
入力として和差の振幅比を算出する振幅比算出器２０４
を有する。2. Description of the Related Art Conventionally, in a monopulse radar apparatus using this kind of sum and difference antenna pattern, a monopulse antenna 1 as shown in FIG. 5 is used to determine the left and right of the beam nose (hereinafter referred to as quadrant). Each of the sum signal and the difference signal from (1) corresponds to the one-to-one correspondence with the received signal, and the received signal is amplified and phase-detected to output a video signal (I-video) and a quadrature-phase detected component signal (Q-video) of the I-video. The receiver 2 and the A / D converter 3 for converting the I and Q video signals into digital signals respectively, and the digital I and Q video signal outputs from the A / D converter 3 as inputs, The I / Q combiner 201 for calculating and the phase angle calculator 202 for calculating the phase angle formed by the I and Q signals, and the phase angle of the sum and difference are input to calculate the difference between the phase angles of the sum and difference to determine the quadrant. Quadrant A vessel 203, amplitude ratio calculator calculates the amplitude ratio of the sum and difference sum, the difference each amplitude value as an input 204
Have.
【０００３】ここで、位相角算出器２０２はｔａｎ−１
（Ｑ／Ｉ）を算出する必要があるが、ｔａｎ−１の算出
には関数近似を用いる必要があり、レーダー信号処理の
ようにリアルタイム処理が必要な用途では、実現が困難
である。このため、通常ｔａｎ−１の算出には、予めｔ
ａｎ−１の値を算出しておいてテーブルとして参照す
る、テーブル・ルックアップ回路が用いられる。また、
象限の判定は、図４に示すように和，差の受信信号の位
相が、和ビームのビームノーズを境として逆相になるこ
とを利用し、和差の位相差がほぼゼロの場合（和差同相
の場合）ビームノーズの右、和差の位相差がほぼ１８０
°の場合（和差逆相の場合）ビームノーズの左と判断す
る。Here, the phase angle calculator 202 is tan −1.
Although it is necessary to calculate (Q / I), it is necessary to use function approximation to calculate tan −1 , which is difficult to realize in applications that require real-time processing such as radar signal processing. Therefore, in order to calculate the normal tan −1 , t
A table lookup circuit is used that calculates the value of an −1 and refers to it as a table. Also,
The quadrant is determined by utilizing the fact that the phases of the received signals of the sum and the difference are opposite to each other with the beam nose of the sum beam as a boundary, as shown in FIG. In the case of difference in-phase) The phase difference of the sum difference is about 180 to the right of the beam nose.
In case of ° (in the case of sum difference opposite phase), it is judged as the left of the beam nose.
【０００４】一方、この象限の判定に際し、和、差各々
で受信装置が異なり、お互いの受信装置のバラツキのた
めに、空中線においてはほぼゼロであった和，差信号の
位相差が、受信装置出力ではゼロとならなくなる。この
ため、空中線出力に基準信号を重畳し、この基準信号に
対する受信装置出力での和，差の位相差を補正値として
受信装置において差信号の位相を移相器により補正値分
移相させることにより、このバラツキによる誤差の補正
を行っていた。On the other hand, in the determination of this quadrant, the receivers are different for each of the sum and the difference, and due to the variations of the receivers, the phase difference between the sum and difference signals, which was almost zero in the antenna, is the receiver. The output will never be zero. For this reason, the reference signal is superimposed on the antenna output, and the phase of the difference signal is phase-shifted by the phase shifter in the receiving device using the phase difference of the sum and difference at the output of the receiving device with respect to this reference signal as the correction value. Therefore, the error due to this variation is corrected.
【０００５】[0005]
【発明が解決しようとする課題】このような従来の移相
器による位相の補正方式では、移相器が位相を移相させ
ることのできる最小の単位（分解能と呼ぶ。）を小さく
することが困難（アナログ信号の位相を移相させるため
には、所定の分解能相当の移相量を持った基本移相器
を、必要な移相量が得られるまで、縦続接続する。この
ため、分解能を小さくすれば必要な縦続接続数が多くな
るため規模が大きくなり、実現が困難になる）であるこ
とから、算出した補正値の変動により移相量が変動する
場合が生じる。近年のドップラ処理を行うレーダー処理
においては、このような位相の変動は処理誤差となるた
め、許容できない。In such a conventional phase correction method using a phase shifter, it is possible to reduce the minimum unit (called resolution) by which the phase shifter can shift the phase. Difficult (In order to shift the phase of analog signals, basic phase shifters with a phase shift amount equivalent to a predetermined resolution are cascaded until the required phase shift amount is obtained. If it is made small, the number of cascade connections required becomes large, and the scale becomes large, which makes it difficult to realize). Therefore, the amount of phase shift may change due to the change in the calculated correction value. In the radar processing that performs the Doppler processing in recent years, such a phase fluctuation is a processing error, and thus cannot be allowed.
【０００６】このため、Ａ／Ｄ変換後ディジタル処理に
より補正値の算出及び補正処理を行う方法が考えられて
いる。しかしこの場合には、補正処理のため、いわゆる
複素乗算処理が必要（位相検波後のＩ，Ｑ信号は直交信
号であり、処理上は複素数として取り扱われる）であ
り、回路構成が複雑となる問題点があった（複素乗算で
あり、乗算器４個、加算器２個必要である）。Therefore, a method of calculating and correcting a correction value by digital processing after A / D conversion has been considered. However, in this case, so-called complex multiplication processing is necessary for correction processing (I and Q signals after phase detection are quadrature signals, and are treated as complex numbers in processing), and the circuit configuration becomes complicated. There was a point (complex multiplication, requiring 4 multipliers and 2 adders).
【０００７】[0007]
【発明の目的】本発明は、かかる従来例の有する不都合
を改善し、とくに、空中線からの和又は差の受信信号の
バラツキに対する補正を容易になし得るモノパルスレー
ダ装置を提供することを、その目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a monopulse radar device which improves the disadvantages of the conventional example, and in particular can easily correct the variation of the received signal of the sum or the difference from the antenna. And
【０００８】[0008]
【課題を解決するための手段】本発明では、和又は差ア
ンテナパターンを用いてモノパルス測角を行うモノパル
スレーダ装置において、モノパルス空中線からの和又は
差の各受信信号に基準信号を重畳する基準信号合成器
と、各受信信号に１対１に対応して、各受信信号を位相
検波しビデオ信号（Ｉビデオ）及びこのＩビデオの直交
位相検波成分信号（Ｑビデオ）を出力する受信装置と、
このＩ，Ｑビデオ信号を各々ディジタル信号に変換する
Ａ／Ｄ変換器と、このＡ／Ｄ変換器からのディジタル
Ｉ，Ｑビデオ信号出力を入力として各々の絶対値Ｉ ，
Ｑを算出する絶対値算出器と、この絶対値に重み付け係
数を乗じた後お互いを加算する複数の重み付け演算器
と、複数の重み付け演算器出力より最大値を選択する比
較選択器と、この比較選択器がどの重み付け演算回路の
出力を選択したかを出力する比較判定結果出力器と、絶
対値回路の入力であるＩ，Ｑビデオ信号各々の符号を判
定する符号判定器とを備えている。更に、和又は差各々
の比較判定結果出力器の出力と符号判定器の出力とを入
力として和又は差信号の位相差を算出する位相差算出器
と、基準信号が重畳されている時に基準信号に対する位
相差算出器の出力を記憶する記憶器と、位相差算出器出
力に記憶出力を加算または減算する加減算器と、加減算
器出力より和又は差受信信号が成す位相角の象限判定を
行う象限判定器と、和又は差各々の振幅値を入力として
和差の振幅比を算出する振幅比算出器とを備える、とい
う構成をとっている。これによって前述した目的を達成
しようとするものである。According to the present invention, in a monopulse radar device for performing monopulse angle measurement using a sum or difference antenna pattern, a reference signal for superposing a reference signal on each sum or difference received signal from a monopulse antenna. and combiner, in one-to-one correspondence with each received signal, a receiver for outputting a phase detection in a video signal of each reception signal (I video) and quadrature phase detection component signal of the I video (Q video),
An A / D converter for converting each of the I and Q video signals into a digital signal, and an absolute value I.sub.2 for each of the digital I and Q video signal outputs from the A / D converter as inputs.
An absolute value calculator for calculating Q, a plurality of weighting calculators for multiplying the absolute values by weighting factors and then adding each other, a comparison selector for selecting the maximum value from the outputs of the plurality of weighting calculators , and this comparison a comparison determination result output unit that outputs whether to select the output of the selector what weighting calculation circuit, absolute
A code judging device for judging the sign of each of the I and Q video signals which are the inputs of the logarithmic circuit . Furthermore, a phase difference calculator for calculating a phase difference of the sum or difference signal and outputs of the code decision unit the comparison determination result output unit of the sum or difference respectively as an input, a reference signal when the reference signal is superimposed place for
A storage unit for storing the output of the phase difference calculator, and a subtracter for adding or subtracting the stored output to the phase difference calculator output <br/> force, subtraction
A quadrant determiner that determines the quadrant of the phase angle formed by the sum or difference received signal from the output of the device, and an amplitude ratio calculator that calculates the amplitude ratio of the sum and difference by inputting the amplitude values of the sum and the difference, respectively. Is taking. This aims to achieve the above-mentioned object.
【０００９】[0009]
【実施例】次に、本発明について図面を参照して説明す
る。図１ないし図２に本発明の一実施例を示す。この図
１ないし図２に示す実施例は、モノパルス空中線１から
の和，差各々の受信信号に基準信号を重畳する基準信号
合成器２と、和，差各々の受信信号に１対１に対応し各
受信信号を増幅し位相検波することによりビデオ信号
（Ｉビデオ）及びＩビデオの直交位相検波成分信号（Ｑ
ビデオ）を出力する受信装置３とを備えている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. 1 and 2 show an embodiment of the present invention. The embodiment shown in FIGS. 1 and 2 corresponds to a reference signal synthesizer 2 for superposing a reference signal on the received signals of the sum and the difference from the monopulse antenna 1 and one-to-one correspondence to the received signals of the sum and the difference. Then, each received signal is amplified and phase detected to obtain a video signal (I video) and a quadrature phase detection component signal (Q) of the I video.
And a receiving device 3 for outputting (video).
【００１０】更に、このＩ，Ｑビデオ信号を各々ディジ
タル信号に変換するＡ／Ｄ変換器４と、Ａ／Ｄ変換器か
らのディジタルＩ，Ｑビデオ信号出力を入力として受信
信号の振幅値（すなわち（Ｉ２＋Ｑ２）１／２）を算出
する近似式『Ａ・｜Ｉ｜＋Ｂ・｜Ｑ｜』においてＩ，Ｑ
各々の絶対値を算出する絶対値算出器１０１，１０２
と、（Ａ，Ｂ）の組として（１，１／８），（７／８，
１／２），（１／２，７／８），（１／８，１），（４
５／６４，４５／６４）の重み付けを絶対値算出器１０
１，１０２出力に行う重み付け演算器１０３〜１０７と
を備えている。Further, the A / D converter 4 for converting the I and Q video signals into digital signals respectively, and the digital I and Q video signal outputs from the A / D converter as inputs, the amplitude value of the received signal (that is, In the approximate expression “A · | I | + B · | Q |” for calculating (I 2 + Q 2 ) ½ ), I and Q
Absolute value calculator 101, 102 for calculating each absolute value
And (1, 1/8), (7/8,) as a set of (A, B)
1/2), (1/2, 7/8), (1/8, 1), (4
5/64, 45/64) and the absolute value calculator 10
1, 102 output, and weighting calculators 103 to 107 are provided.
【００１１】また、更に、この５個の重み付け演算器出
力を各々２個づつ，すなわち（１，１／８）の重み付け
を行う重み付け演算器１０３出力と（７／８，１／２）
の重み付けを行う重み付け演算器１０４出力とを比較し
大きな方を出力する比較選択器１１１と、（１／２，７
／８）の重み付けを行う重み付け演算器１０５出力と
（１／８，１）の重み付けを行う重み付け演算器１０６
出力とを比較し大きな方を出力する比較選択器１１２
と、（４５／６４，４５／６４）の重み付けを行う重み
付け演算器１０７出力と比較選択器１１１出力とを比較
し大きな方を出力する比較選択器１１３と、比較選択器
１１２出力と比較選択器１１３出力とを比較し大きな方
を出力する比較選択器１１４とを備えている。Further, each of the five weighting calculator outputs is two, that is, the weighting calculator 103 output for weighting (1, 1/8) and (7/8, 1/2).
A comparison selector 111 for comparing the output of the weighting calculator 104 for weighting
/ 8) weighting calculator 105 output and (1/8, 1) weighting calculator 106
Comparison selector 112 that compares the output with the larger one
If, (45 / 64,45 / 64) weighting and weighting calculator 107 outputs to perform a comparison selector 113 compares the comparison selector 111 outputs to output a larger one, comparator selector 112 outputs a comparison selector A comparison selector 114 is provided for comparing the 113 output and the larger one.
【００１２】そして、比較選択器１１１〜１１４がどち
らかの入力を選択したか（すなわちどの（Ａ，Ｂ）の組
が選択されたか）を出力する比較判定結果出力器１２１
〜１２４と、絶対値算出器１０１，１０２の入力である
Ｉ，Ｑ信号の符号を判定する符号判定器１３１，１３２
と、和，差各々の比較判定結果出力器１２１〜１２４の
出力と符号判定器１３１，１３２の出力とを入力とし
和，差信号の位相差を算出する位相差算出器１４０と、
基準信号が重畳されている時に基準信号に対する位相差
算出器１４０の出力を記憶する記憶器１４１と、位相差
算出器１４０出力に記憶器１４１出力を加算または減算
する加減算器１４２と、加減算器１４２出力より和，差
受信信号が成す位相角の象限判定を行う象限判定器１５
０と、和，差各々の振幅値（比較選択器１１４出力）を
入力として和差の振幅比を算出する振幅比算出器１５０
とを備えている。Then, the comparison / judgment result output device 121 for outputting which input the comparison selectors 111 to 114 have selected (that is, which (A, B) pair has been selected)
To 124, and code determiners 131 and 132 for determining the signs of the I and Q signals input to the absolute value calculators 101 and 102.
And a phase difference calculator 140 for calculating the phase difference of the sum and difference signals by inputting the outputs of the comparison judgment result output devices 121 to 124 and the outputs of the sign judgment devices 131 and 132 , respectively.
A storage unit 141 for storing the output of the phase difference calculator 140 with respect to the reference signal when the reference signal is superimposed, the phase difference
An adder / subtractor 142 that adds or subtracts the output of the memory 141 to the output of the calculator 140, and a quadrant determiner 15 that determines the quadrant of the phase angle formed by the sum and difference received signals from the output of the adder / subtractor 142
An amplitude ratio calculator 150 for calculating the amplitude ratio of the sum and difference by inputting 0 and the amplitude values of the sum and the difference (the output of the comparison selector 114 ).
It has and.
【００１３】ここで上記の角（Ａ，Ｂ）の組は、位相角
の変化につれて順次最大値を与える。すなわち、（１，
１／８）は（０°〜１８．４°）、（７／８，１／２）
は（１８．４°〜４０．２°）、（４５／６４，４５／
６４）は（４０．２°〜４９．８°）、（１／２，７／
８）は（４９．８°〜７１．６°）、（１／８，１）は
（７１．６°〜９０°）の範囲で、各々前記近似式『Ａ
・｜Ｉ｜＋Ｂ・｜Ｑ｜』出力の最大値を与える係数とな
る（ここで、本近似式による振幅値の値については、実
用新案・直交信号合成器（５６−０４７９９５）に詳し
い）。Here, the above-mentioned set of angles (A, B) sequentially gives maximum values as the phase angle changes. That is, (1,
1/8) is (0 ° -18.4 °), (7/8, 1/2)
Is (18.4 ° to 40.2 °), (45/64, 45 /
64) is (40.2 ° to 49.8 °), (1/2, 7 /
8) is in the range of (49.8 ° to 71.6 °), and (1/8, 1) is in the range of (71.6 ° to 90 °), and the approximate expression “A
-| I | + B- | Q | " is a coefficient that gives the maximum value of the output (here, the value of the amplitude value according to this approximate expression is detailed in the utility model / quadrature signal synthesizer (56-047995)).
【００１４】したがって、前述した比較判定結果出力器
１２１〜１２４と符号判定器１３１，１３２とを組み合
わせることにより、Ｉ，Ｑ信号が成す位相角（正確に
は、３６０度を２０個に分割した中のどれか）を判定す
ることができる。和，差各々のこの位相角判定結果を元
に和，差各々の差が、所定の値以下であれば和差同相、
所定の値以上であれば和差逆相とすることにより、象限
判定が行われる。この象限判定において、和，差信号間
にバラツキがあると、和，差信号が成す位相角がこのバ
ラツキ分誤差を含むことになる。Therefore, by combining the above-mentioned comparison / decision result output devices 121 to 124 and the code judgment devices 131 and 132, the phase angle formed by the I and Q signals (more accurately, 360 degrees is divided into 20). Can be determined). If the difference between the sum and the difference is less than or equal to a predetermined value based on the phase angle determination result of the sum and the difference, the sum-difference in-phase,
If the difference is equal to or more than a predetermined value, the quadrant determination is performed by setting the sum difference difference opposite phase. In this quadrant determination, if there is a variation between the sum and difference signals, the phase angle formed by the sum and difference signals will include this variation error.
【００１５】したがって、この誤差を取り除くため基準
信号を基準信号合成器に入力し、この基準信号に対する
和，差の位相差の理論値（例えば、基準信号として和，
差同相となる信号を与えれば、位相差はゼロとなる。）
からのズレを補正値として記憶器１４１から出力し、加
減算器１４２にて補正を行う。Therefore, in order to remove this error, the reference signal is input to the reference signal synthesizer, and the theoretical value of the phase difference between the sum and the difference with respect to the reference signal (for example, the sum as the reference signal,
If signals with different in-phase are given, the phase difference becomes zero. )
The deviation from is output as a correction value from the storage unit 141, and the addition / subtraction unit 142 corrects it.
【００１６】次に、第２の実施例を図３に示す。この第
２実施例は、図１の実施例のＡ／Ｄ変換器４と絶対値算
出器１０１，１０２との間に、信号処理器１６０を有す
る。この信号処理器１６０は、受信信号のドップラ情報
を用いて不要信号の抑圧あるいは雑音信号に対する信号
強度比の改善を行う。位相補正及び象限判定は、この信
号処理後の信号に対し行われる。ここでの補正の分解能
はあまり高くないが、信号処理を行った後での処理であ
り、かつ、象限判定を行うときのみ実施される処理であ
り、信号処理に与える影響は問題とならない。Next, a second embodiment is shown in FIG . The second embodiment has a signal processor 160 between the A / D converter 4 and the absolute value calculators 101 and 102 of the embodiment shown in FIG. The signal processor 160 suppresses unnecessary signals or improves the signal strength ratio with respect to noise signals by using Doppler information of received signals. Phase correction and quadrant determination are performed on the signal after this signal processing. Although the resolution of the correction here is not so high, it is the processing after the signal processing is performed and is the processing performed only when the quadrant determination is performed, and the influence on the signal processing does not pose a problem.
【００１７】[0017]
【発明の効果】以上説明したように本発明は、Ｉ／Ｑ合
成における近似計算を利用することにより、簡単な回路
でかつ和，差各受信装置間のバラツキの補正も容易に実
現可能であり、かつ信号処理への影響も回避可能とな
る、という従来にない優れたモノパルスレーダ装置を提
供することができる。As described above, according to the present invention, by using the approximate calculation in the I / Q combination, it is possible to easily realize the correction of the variation between the sum and difference receiving devices with a simple circuit. In addition, it is possible to provide an unprecedented excellent monopulse radar device in which the influence on the signal processing can be avoided.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】図面の簡単な説明[Name of item to be corrected] Brief description of the drawing
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の一実施例を示す系統図である。FIG. 1 is a system diagram showing an embodiment of the present invention.
【図２】図１の全体的出力信号を入力し所定の象限判定
を行なうためのブロック図である。 FIG. 2 is a predetermined quadrant judgment by inputting the overall output signal of FIG .
It is a block diagram for performing.
【図３】本発明の第２の実施例を示す系統図である。 FIG. 3 is a system diagram showing a second embodiment of the present invention.
【図４】和，差受信信号の位相関係の一例を示す説明図
である。FIG. 4 is an explanatory diagram showing an example of a phase relationship between sum and difference received signals.
【図５】従来例におけるモノパルス測角回路を示す系統
図である。FIG. 5 is a system diagram showing a monopulse angle measuring circuit in a conventional example.
【符号の説明】 １ モノパルス空中線 ２ 基準信号合成器 ３ 受信機 ４ Ａ／Ｄ変換器 １０１，１０２ 絶対値算出器 １０３〜１０７ 重み付け演算器 １１１〜１１４ 比較選択器 １２１〜１２４ 比較判定結果出力器 １３１，１３２ 符号判定器 １４０ 象限判定器 １５０ 振幅比算出器 １６０ 信号処理器 ２０１ Ｉ／Ｑ合成器 ２０２ 位相角算出器 ２０３ 象限判定器 ２０４ 振幅比算出器 ３０１ 和受信信号 ３０２ 差受信信号[Description of Reference Signs] 1 monopulse antenna 2 reference signal combiner 3 receiver 4 A / D converter 101, 102 absolute value calculator 103-107 weighting calculator 111-114 comparison selector 121-124 comparison determination result output device 131 , 132 code determiner 140 quadrant determiner 150 amplitude ratio calculator 160 signal processor 201 I / Q combiner 202 phase angle calculator 203 quadrant determiner 204 amplitude ratio calculator 301 sum received signal 302 difference received signal
【手続補正４】[Procedure amendment 4]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図３[Name of item to be corrected] Figure 3
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図３】 [Figure 3]
【手続補正５】[Procedure Amendment 5]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図５[Name of item to be corrected] Figure 5
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図５】 [Figure 5]
Claims (2)
パルス測角を行うモノパルスレーダ装置において、前記
モノパルス空中線からの和又は差の各受信信号に基準信
号を重畳する基準信号合成器と、前記各受信信号に１対
１に対応して、各受信信号を位相検波しビデオ信号（Ｉ
ビデオ）及びこのＩビデオの直交位相検波成分信号（Ｑ
ビデオ）を出力する受信装置と、このＩ，Ｑビデオ信号
を各々ディジタル信号に変換するＡ／Ｄ変換器と、この
Ａ／Ｄ変換器からのディジタルＩ，Ｑビデオ信号出力を
入力として各々の絶対値 Ｉ ， Ｑ を算出する絶対
値算出器と、この絶対値に重み付け係数を乗じた後お互
いを加算する複数の重み付け演算器と、前記複数の重み
付け演算器出力より最大値を選択する比較選択器と、こ
の比較選択器がどの重み付け演算回路の出力を選択した
かを出力する比較判定結果出力器と、前記絶対値回路の
入力であるＩ，Ｑビデオ信号各々の符号を判定する符号
判定器と、和又は差各々の前記比較判定結果出力器の出
力と前記符号判定器の出力とを入力として和又は差信号
の位相差を算出する位相差算出器と、前記基準信号が重
畳されている時に前記基準信号に対する前記位相差算出
器の出力を記憶する記憶器と、前記位相差算出器出力に
前記記憶器出力を加算または減算する加減算器と、前記
加減算器出力より和又は差受信信号が成す位相角の象限
判定を行う象限判定器と、和又は差各々の振幅値を入力
として和差の振幅比を算出する振幅比算出器とを備えた
ことを特徴とするモノパルスレーダ装置。1. A monopulse radar apparatus for performing monopulse angle measurement using a sum or difference antenna pattern, and a reference signal synthesizer for superposing a reference signal on each sum or difference reception signal from the monopulse antenna, and each reception signal. The received signals are phase-detected in a one-to-one correspondence with the video signals (I
Video) and the quadrature detection component signal (Q
Video), an A / D converter for converting the I and Q video signals into digital signals, and a digital I, Q video signal output from the A / D converter as an input for each absolute signal. An absolute value calculator for calculating the values I and Q, a plurality of weighting calculators for multiplying the absolute values by weighting coefficients and then adding each other, and a comparison selector for selecting the maximum value from the outputs of the plurality of weighting calculators. And a comparison judgment result output device for outputting which weighting operation circuit the comparison selector has selected, and a code judgment device for judging the sign of each of the I and Q video signals input to the absolute value circuit. , A sum or difference phase difference calculator for calculating the phase difference of the sum or difference signal with the output of the comparison judgment result output unit and the output of the sign judgment unit as input, and when the reference signal is superimposed. The base A memory for storing the output of the phase difference calculator for the quasi signal, an adder / subtractor for adding or subtracting the memory output to the phase difference calculator output, and a phase formed by the sum or difference received signal from the adder / subtractor output A monopulse radar device, comprising: a quadrant determiner for making a quadrant determination of an angle; and an amplitude ratio calculator for calculating an amplitude ratio of a sum difference, with an amplitude value of each sum or difference as an input.
に、受信信号のドップラ情報を用いたコヒアレントな信
号処理を行う信号処理器を装備したことを特徴とする請
求項１記載のモノパルスレーダ装置。2. A signal processor for performing coherent signal processing using Doppler information of a received signal is provided between the A / D converter and the absolute value calculator. Monopulse radar device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3360190A JP2727838B2 (en) | 1991-12-27 | 1991-12-27 | Monopulse radar device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3360190A JP2727838B2 (en) | 1991-12-27 | 1991-12-27 | Monopulse radar device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05180932A true JPH05180932A (en) | 1993-07-23 |
| JP2727838B2 JP2727838B2 (en) | 1998-03-18 |
Family
ID=18468299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3360190A Expired - Fee Related JP2727838B2 (en) | 1991-12-27 | 1991-12-27 | Monopulse radar device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2727838B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05240935A (en) * | 1992-02-26 | 1993-09-21 | Nec Corp | Monopulse angle measuring instrument |
| WO2010143462A1 (en) * | 2009-06-08 | 2010-12-16 | 株式会社 東芝 | Radar apparatus |
| JP2015121404A (en) * | 2013-12-20 | 2015-07-02 | 日本電気株式会社 | Angle measuring device, angle measuring method and program |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50150395A (en) * | 1974-05-21 | 1975-12-02 | ||
| JPS6057024A (en) * | 1984-07-12 | 1985-04-02 | Matsushita Electric Ind Co Ltd | Disk brake |
| JPS6220022U (en) * | 1985-07-19 | 1987-02-06 |
-
1991
- 1991-12-27 JP JP3360190A patent/JP2727838B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50150395A (en) * | 1974-05-21 | 1975-12-02 | ||
| JPS6057024A (en) * | 1984-07-12 | 1985-04-02 | Matsushita Electric Ind Co Ltd | Disk brake |
| JPS6220022U (en) * | 1985-07-19 | 1987-02-06 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05240935A (en) * | 1992-02-26 | 1993-09-21 | Nec Corp | Monopulse angle measuring instrument |
| WO2010143462A1 (en) * | 2009-06-08 | 2010-12-16 | 株式会社 東芝 | Radar apparatus |
| JP2015121404A (en) * | 2013-12-20 | 2015-07-02 | 日本電気株式会社 | Angle measuring device, angle measuring method and program |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2727838B2 (en) | 1998-03-18 |
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