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JPS60188866A - Synthetic aperture radar - Google Patents

Synthetic aperture radar

Info

Publication number
JPS60188866A
JPS60188866A JP59045020A JP4502084A JPS60188866A JP S60188866 A JPS60188866 A JP S60188866A JP 59045020 A JP59045020 A JP 59045020A JP 4502084 A JP4502084 A JP 4502084A JP S60188866 A JPS60188866 A JP S60188866A
Authority
JP
Japan
Prior art keywords
radar
signal processing
synthetic aperture
coherent
image
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
Application number
JP59045020A
Other languages
Japanese (ja)
Inventor
Makoto Ono
誠 小野
Hirokazu Tanaka
宏和 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP59045020A priority Critical patent/JPS60188866A/en
Publication of JPS60188866A publication Critical patent/JPS60188866A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
    • G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G01S7/4052—Means for monitoring or calibrating by simulation of echoes
    • G01S7/4082—Means for monitoring or calibrating by simulation of echoes using externally generated reference signals, e.g. via remote reflector or transponder

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

PURPOSE:To improve the picture of a synthetic aperture radar in quality by receiving an echo from a coherent target on the ground by a radar mounted on an artificial satellite or an aircraft, sending the echo to a signal processing device, and signal processing after separating the image of the coherent target. CONSTITUTION:A coherent target 7 is placed at an optional point on the ground, and its echo is received by a radar antenna mounted on an artificial satellite or an aircraft, and recorded in a data recording and transmitting system 3 through a receiving set 2. Then, recorded signals are sent to a primary signal processing device 4 on the ground, and the spectrum of the image is obtained by a coherent target image separating device 5, and an error at the determination of the orbit and an error data of inertial navigation are determined. The data are inputted to a secondary signal processing device 6 to correct the primary signal. A corner reflector parabola are used as a target 7. As this synthetic aperture radar makes signal processing by a coherent target image separating device, a picture with high quality can be obtained.

Description

【発明の詳細な説明】 〔発明の技術分野ｊ この発明は１人工衛星や航空機に搭載される合成開口レ
ーダに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention j] This invention relates to a synthetic aperture radar mounted on an artificial satellite or an aircraft.

〔従来技術〕[Prior art]

第１図は従来の合成開口レーダのシステム構成例を示す
図であり１図において、（１）はレーダアンテナ、（２
）はレーダ送受信機、（３）はレーダエコーデータを記
録あるいは伝送するデータ記録伝送システム、（４）は
レーダエコーデータを信号処理して映像を再生する信号
処理装置である。Figure 1 is a diagram showing an example of the system configuration of a conventional synthetic aperture radar. In Figure 1, (1) is a radar antenna, (2)
) is a radar transceiver, (3) is a data recording and transmission system that records or transmits radar echo data, and (4) is a signal processing device that performs signal processing on radar echo data to reproduce video.

従来の装置は上記のように構成され、レーダアンテナ（
１）、レーダ送受信機（２）およびデータ記録伝送シス
テム（３）は人工衛星あるいは航空機に搭載されて動作
し、地表あるいは海面からのレーダ反射波を地上へレー
ダデータとして送るか、上空で記録し地上へ持ち帰って
信号処理装置に入力していた。合成開口レーダでは、こ
のようにして、昼夜・天候に関係なく高分解能のレーダ
映像を得ているが、良い画質を得るためには、レーダシ
ステムを搭載する人工衛星や航空機の運動をレーダで使
用する電波の波長より高い精度で確定して信号処理装置
の処理条件関数として入力してやる事が必要である。The conventional device is configured as described above and includes a radar antenna (
1), the radar transceiver (2) and the data recording and transmission system (3) operate onboard an artificial satellite or aircraft, and either send radar reflected waves from the ground or sea surface to the ground as radar data or record them in the sky. It was brought back to the ground and inputted into a signal processing device. In this way, synthetic aperture radar obtains high-resolution radar images regardless of day or night or weather, but in order to obtain good image quality, the movement of the satellite or aircraft carrying the radar system must be used in the radar. It is necessary to determine the wavelength with a higher precision than the wavelength of the radio wave to be used and input it as a processing condition function of the signal processing device.

従来の方式では、これらのデータは１人工衛星であれば
、軌道決定計算の結果として得られる軌道要素データを
用い、航空機であれば慣性航法装置の制御信号データが
用いられていだが、これらのデータは精度が不充分の場
合が多く、良い画像が得られないという欠点があった。In the conventional method, for a single artificial satellite, this data uses orbital element data obtained as a result of orbit determination calculations, and for an aircraft, control signal data of an inertial navigation system is used. The disadvantage is that the accuracy is often insufficient and good images cannot be obtained.

〔発明の概要〕[Summary of the invention]

この発明は従来の方式の持つ上記の欠点を改善する目的
でなされたもので１画像データの内にある情報をもとに
良い画質の合成開口レーダ映像を得られるシステムを提
供しようとするものである。This invention was made with the aim of improving the above-mentioned drawbacks of the conventional method, and aims to provide a system that can obtain synthetic aperture radar images of good image quality based on the information contained in one image data. be.

〔発明の実施例〕[Embodiments of the invention]

第２図はこの発明の一実施例を示す構成図であ、Ｃ，（
１１〜（４）は上記従来システムと全く同一のものであ
る。（５）は従来方式により得られた映像から。FIG. 2 is a block diagram showing an embodiment of the present invention.
11 to (4) are completely the same as the above conventional system. (5) is from images obtained using the conventional method.

コヒーレントターゲット（７）の映像を抽出する装置。A device that extracts images of coherent targets (7).

（６）はこの映像データを基に信号処理を行って良質の
画像を得る装置、（７）は観測域に設置されるコヒーレ
ントターゲットである。(6) is a device that performs signal processing based on this video data to obtain a high-quality image, and (7) is a coherent target installed in the observation area.

以上の構成において、レーダ送受信機（２）によシ発生
した信号はアンテナ１１）を介して地上へ向ってット（
７）からの反射波を含むレーダエコーは再びアンテナ（
１’ｌで受信され、レーダ送受信機（２）を経由し。In the above configuration, the signal generated by the radar transceiver (2) is transmitted to the ground via the antenna (11).
The radar echo including the reflected wave from 7) returns to the antenna (
1'l and via the radar transceiver (2).

データ記録・伝送システムによりデータが記録された後
、１次信号処理装置により、従来方式と全く同様に信号
処理されて１次映像を得る。この映像の内にあるコヒー
レントターゲットの映像の周辺の像のみをコヒーレント
ターゲット映像分離装置により分離し、そのスペクトル
をめると、レーダで使用する電波の波長程度の精度での
軌道の決定誤差や、慣性航法装置の出力データの誤差が
められる。従って、このデータを用いれば１次信号処理
装置における処理条件関数の鰻定を補正して、最良の画
像を２次信号処理装置により出力する事が出来る。After data is recorded by the data recording/transmission system, the signal is processed by the primary signal processing device in exactly the same manner as in the conventional method to obtain a primary image. If we separate only the peripheral image of the coherent target image in this image using a coherent target image separation device and examine its spectrum, we can detect errors in determining the orbit with an accuracy comparable to the wavelength of radio waves used in radar, There is an error in the output data of the inertial navigation system. Therefore, by using this data, it is possible to correct the predetermined value of the processing condition function in the primary signal processing device, and output the best image by the secondary signal processing device.

以上の説明で、コヒーレントターゲット（７）の具体例
としてはコーナリフレクタあるいはパラボラアンテナ等
が用いられる。In the above description, a corner reflector, a parabolic antenna, or the like is used as a specific example of the coherent target (7).

なお上記の説明では、１次信号処理装置と２次信号処理
装置は別々の装置としであるが、同一の装置を反復使用
しても全く同様に処理可能である。In the above explanation, the primary signal processing device and the secondary signal processing device are separate devices, but even if the same device is used repeatedly, processing can be performed in exactly the same way.

〔発明の効果〕〔Effect of the invention〕

この発明は９以上説明したように、信号処理に使用する
条件関数の精度が不充分であっても良質の画像を得る事
が出来るので２合成開口レーダ゛の信号処理方式として
極めて有効である。As explained above, this invention is extremely effective as a signal processing method for a two-synthetic aperture radar, since it is possible to obtain a high-quality image even if the accuracy of the condition function used for signal processing is insufficient.

【図面の簡単な説明】[Brief explanation of the drawing]

＠１図は従来の合成開口レーダのシステム構成を示す図
、第２図はこの発明の合成開口レーダのシステム構成を
示す図である。 図において、（１）はレーダアンテナ、（２）はレーダ
送受信機、（４）は信号処理装置、（７）はコヒーレン
トターゲットである。 なお１図中、同一あるいは相当部分は同一符号を用いて
示しである。 代理人大岩増雄 第　１　図1 is a diagram showing the system configuration of a conventional synthetic aperture radar, and FIG. 2 is a diagram showing the system configuration of the synthetic aperture radar of the present invention. In the figure, (1) is a radar antenna, (2) is a radar transceiver, (4) is a signal processing device, and (7) is a coherent target. In FIG. 1, the same or equivalent parts are indicated using the same reference numerals. Agent Masuo Oiwa Figure 1

Claims (1)

【特許請求の範囲】[Claims] 航空機あるいは人工＃ｉ里に搭載されたコヒーレントパ
ルスレーダト、このコヒーレントパルスレーダによって
観測される地上の任意の点に配置さレタコヒーレントレ
ータ反射源ト、　コヒーレントパルスレーダによって得
られた複素型反射エコー信号を記録する手段と、この記
録されたエコー信号を信号処理してレーダ映像を作成す
る信号処理機能とから成る合成開口レーダにおいて、コ
ヒーレントレーダ反射源からの反射電波を１合成開口信
号処理における参照関数として用いる事を特徴とする合
成開口レーダ。A coherent pulse radar mounted on an aircraft or artificial intelligence, a recoherent radar reflection source placed at any point on the ground that can be observed by this coherent pulse radar, and a complex reflected echo signal obtained by the coherent pulse radar. In a synthetic aperture radar consisting of means for recording echo signals and a signal processing function for processing the recorded echo signals to create a radar image, the reflected radio waves from the coherent radar reflection source are converted into one reference function in synthetic aperture signal processing. A synthetic aperture radar characterized by being used as a
JP59045020A 1984-03-09 1984-03-09 Synthetic aperture radar Pending JPS60188866A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59045020A JPS60188866A (en) 1984-03-09 1984-03-09 Synthetic aperture radar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59045020A JPS60188866A (en) 1984-03-09 1984-03-09 Synthetic aperture radar

Publications (1)

Publication Number Publication Date
JPS60188866A true JPS60188866A (en) 1985-09-26

Family

ID=12707655

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59045020A Pending JPS60188866A (en) 1984-03-09 1984-03-09 Synthetic aperture radar

Country Status (1)

Country Link
JP (1) JPS60188866A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4786906A (en) * 1985-06-17 1988-11-22 Forsvarets Forskningstjeneste Method of motion compensation in synthetic aperture radar target imaging and a system for performing the method
CN110907933A (en) * 2019-11-26 2020-03-24 西安空间无线电技术研究所 A distributed-based synthetic aperture correlation processing system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4786906A (en) * 1985-06-17 1988-11-22 Forsvarets Forskningstjeneste Method of motion compensation in synthetic aperture radar target imaging and a system for performing the method
CN110907933A (en) * 2019-11-26 2020-03-24 西安空间无线电技术研究所 A distributed-based synthetic aperture correlation processing system and method

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