JP2002148329A - Disturbance wave removing method - Google Patents
Disturbance wave removing methodInfo
- Publication number
- JP2002148329A JP2002148329A JP2000381054A JP2000381054A JP2002148329A JP 2002148329 A JP2002148329 A JP 2002148329A JP 2000381054 A JP2000381054 A JP 2000381054A JP 2000381054 A JP2000381054 A JP 2000381054A JP 2002148329 A JP2002148329 A JP 2002148329A
- Authority
- JP
- Japan
- Prior art keywords
- wave
- pulse compression
- fourier transform
- disturbance wave
- fourier
- 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
Landscapes
- Radar Systems Or Details Thereof (AREA)
- Noise Elimination (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】 この発明はレーダ装置に照
射される強力な妨害波を減殺する妨害波除去方法に関す
るものである。[0001] 1. Field of the Invention [0002] The present invention relates to a method for removing an interference wave for reducing a strong interference wave applied to a radar device.
【０００２】[0002]
【従来の技術】レーダ装置では、強力な妨害波からその
機能を守るために種々の方法がサイドローブキャンセラ
（ＳＬＣ）として実用されている。従来の方法は、レー
ダ受信系の他に、ＳＬＣ専用の無指向性アンテナと受信
系を用意し、これによって得られる妨害波の振幅・位相
の情報を用いて、レーダ受信系の位相・振幅特性を自動
的に制御して妨害波成分を除去しようとするものであっ
た。2. Description of the Related Art In a radar apparatus, various methods have been put to practical use as a side lobe canceller (SLC) in order to protect its function from strong interference waves. In the conventional method, in addition to a radar receiving system, an omnidirectional antenna and a receiving system dedicated to SLC are prepared, and the phase / amplitude characteristics of the radar receiving system are obtained by using information on the amplitude / phase of the interfering wave obtained thereby. Is automatically controlled to remove the interference wave component.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
方法はアナログ的に受信系内で処理されるものであり、
信号形態が雑多な総ての妨害波に応動することは困難で
あり、微妙な応答特性の調整が必要であった。 また、
専用の受信系が必要となることから、装置が複雑になる
という問題があった。本発明は、上記のような問題を解
決しようとしてなされたもので、妨害波の除去の専用の
受信系を使用することなく、通常実用されているディジ
タル信号処理過程の１部に挿入するだけで妨害波除去処
理を実行できる妨害波除去方法の提供を目的とする。However, in the conventional method, analog processing is performed in a receiving system.
It was difficult to respond to all the disturbing waves having various signal forms, and it was necessary to finely adjust the response characteristics. Also,
Since a dedicated receiving system is required, there is a problem that the apparatus becomes complicated. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and does not use a dedicated receiving system for removing an interference wave, but simply inserts it into a part of a digital signal processing process which is normally used. An object of the present invention is to provide an interference wave removal method capable of executing an interference wave removal process.
【０００４】[0004]
【課題を解決するための手段】本発明による妨害波除去
方法では、パルス圧縮過程で実行される受信信号のフー
リエ変換によって得られる周波数スペクトルの中で、自
身の発射した電波の反射波の周波数分布を大きく凌駕し
た周波数成分を除去して、以後のパルス圧縮演算を実行
する。SUMMARY OF THE INVENTION In the method for removing an interfering wave according to the present invention, the frequency distribution of the reflected wave of the radio wave emitted by itself in the frequency spectrum obtained by the Fourier transform of the received signal executed in the pulse compression process. Are removed, and the subsequent pulse compression calculation is executed.
【０００５】[0005]
【作用】ＦＭレーダ波をフーリエ変換すると、変調帯域
に亘る連続スペクトルとなるが、妨害波のスペクトル
は、妨害波の変調姿態にもよるが、概ね、レベルの高い
線スペクトルとなる。この線スペクトルに基準波のスペ
クトルを掛けて逆変換しても妨害波レベルが高い場合に
は、妨害波が再生される。ここで、特定レベルを超える
線スペクトル成分を除去した後に、パルス圧縮をすれ
ば、線スペクトルの対象帯域に占める周波数帯域は微細
であるから、希望波のパルス圧縮に与える影響も微細で
あり、妨害波を除去したパルス圧縮が可能となる。The Fourier transform of an FM radar wave results in a continuous spectrum over the modulation band. The spectrum of the interfering wave is generally a high-level line spectrum depending on the modulating form of the interfering wave. Even if the line spectrum is multiplied by the spectrum of the reference wave and inversely transformed, if the disturbance wave level is high, the disturbance wave is reproduced. Here, if pulse compression is performed after removing the line spectrum component exceeding a specific level, the frequency band occupying the target band of the line spectrum is fine, so the influence on the pulse compression of the desired wave is also fine, and the interference is small. Pulse compression without waves can be performed.
【０００６】[0006]
【発明の実施の形態】図１は従来から行われているＦＭ
レーダのパルス圧縮の処理系統図である。図中、１はフ
ーリエ変換器ａで、時系列の受信信号をフーリエ変換し
て周波数系列の信号に変換する。２もフーリエ変換器ｂ
で、ＦＭレーダの送信波の基準となる基準信号をフーリ
エ変換する。３は外積演算器で、複素数として得られる
前記２系統のフーリエ演算結果の外積を計算する。４は
フーリエ逆変換器で、外積演算器３の結果を逆変換し
て、時系列の圧縮パルスを出力する。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a conventional FM system.
It is a processing system diagram of the pulse compression of a radar. In the figure, reference numeral 1 denotes a Fourier transformer a, which performs a Fourier transform on a time-series received signal to convert it into a frequency-series signal. 2 is also a Fourier transformer b
, A Fourier transform is performed on a reference signal serving as a reference of a transmission wave of the FM radar. Reference numeral 3 denotes an outer product calculator for calculating an outer product of the results of Fourier operation of the two systems obtained as a complex number. Reference numeral 4 denotes a Fourier inverse transformer, which inversely transforms the result of the outer product calculator 3 and outputs time-series compressed pulses.
【０００７】図２は本発明による妨害波除去方法の実施
の形態を説明するための系統図である。図中、１フーリ
エ変換器ａ、２フーリエ変換器ｂ、３外積演算器、４フ
ーリエ逆変換器は図１に示した動作と全く同様の動作を
行う。以下、本発明の動作を説明する。５は平均値演算
器であって、フーリエ変換器ａ１の出力レベルを全周波
数帯に亘って累積し、平均値を算出する。６はゲート回
路であって、フーリエ変換器ａ１の各周波数セグメント
の出力が、平均値演算器５で算出された値の所定倍数以
下のもののみ通過させ、外積演算器３に送出し、以下所
定のパルス圧縮演算を実行する。FIG. 2 is a system diagram for explaining an embodiment of the interference wave removing method according to the present invention. In the figure, 1 Fourier transformer a, 2 Fourier transformer b, 3 cross product arithmetic unit, and 4 Fourier inverse transformer perform exactly the same operation as that shown in FIG. Hereinafter, the operation of the present invention will be described. An average calculator 5 accumulates the output levels of the Fourier transformer a1 over the entire frequency band and calculates an average value. Reference numeral 6 denotes a gate circuit, which passes only those whose output of each frequency segment of the Fourier transformer a1 is equal to or less than a predetermined multiple of the value calculated by the average value arithmetic unit 5, sends the same to the outer product arithmetic unit 3, and transmits the signal to the predetermined unit. Is performed.
【０００８】[0008]
【発明の効果】本発明の妨害波除去方法によれば、特殊
のハードウェアを使用することなく、従来から行われて
いるパルス圧縮演算過程に簡単な演算を付加するだけで
妨害波の影響を除去することができる。According to the method for removing an interference wave according to the present invention, the influence of an interference wave can be reduced only by adding a simple operation to a conventional pulse compression operation process without using special hardware. Can be removed.
【０００９】[0009]
【図１】従来から行われているＦＭレーダのパルス圧縮
の処理系統図である。FIG. 1 is a processing system diagram of pulse compression of a conventional FM radar.
【図２】本発明による妨害波除去方法の実施の形態を説
明するための系統図である。FIG. 2 is a system diagram for explaining an embodiment of an interference wave removing method according to the present invention.
１；フーリエ演算器ａ ２；フーリエ演算器ｂ ３；外積演算器 ４；フーリエ逆演算器 ５；平均値演算器 ６；ゲート回路 1; Fourier calculator a 2; Fourier calculator b 3; Cross product calculator 4: Fourier inverse calculator 5; Average calculator 6; Gate circuit
Claims (1)
し、それぞれの変換結果の外積をフーリエ逆変換するＦ
Ｍレーダ装置のパルス圧縮演算過程において、受信信号
のフーリエ変換値に突出した部分が存在したとき、これ
を削除して、以後のパルス圧縮演算を実行することによ
って、妨害波の影響を減殺するようにしたことを特徴と
する妨害波除去方法。1. Fourier transform of a reference signal and a received signal, and an inverse product of Fourier transform of an outer product of each transform result
In the pulse compression calculation process of the M radar device, when there is a prominent portion in the Fourier transform value of the received signal, this is deleted, and the subsequent pulse compression calculation is performed to reduce the influence of the interference wave. A method for removing an interfering wave, the method comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000381054A JP2002148329A (en) | 2000-11-10 | 2000-11-10 | Disturbance wave removing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000381054A JP2002148329A (en) | 2000-11-10 | 2000-11-10 | Disturbance wave removing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002148329A true JP2002148329A (en) | 2002-05-22 |
Family
ID=18849136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000381054A Pending JP2002148329A (en) | 2000-11-10 | 2000-11-10 | Disturbance wave removing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002148329A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376436A (en) * | 2019-06-27 | 2019-10-25 | 东南大学 | A kind of multiple dimensioned line-spectrum detection method for noise power spectra |
-
2000
- 2000-11-10 JP JP2000381054A patent/JP2002148329A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110376436A (en) * | 2019-06-27 | 2019-10-25 | 东南大学 | A kind of multiple dimensioned line-spectrum detection method for noise power spectra |
| CN110376436B (en) * | 2019-06-27 | 2021-06-01 | 东南大学 | Multi-scale noise power spectral line spectrum detection method |
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