JPS61194379A - Synthetic aperture radar image processing apparatus - Google Patents

Synthetic aperture radar image processing apparatus

Info

Publication number
JPS61194379A
JPS61194379A JP60035790A JP3579085A JPS61194379A JP S61194379 A JPS61194379 A JP S61194379A JP 60035790 A JP60035790 A JP 60035790A JP 3579085 A JP3579085 A JP 3579085A JP S61194379 A JPS61194379 A JP S61194379A
Authority
JP
Japan
Prior art keywords
correction
data
range
aperture radar
image data
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
Application number
JP60035790A
Other languages
Japanese (ja)
Other versions
JPH0543071B2 (en
Inventor
Masayuki Hiroguchi
正之 廣口
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP60035790A priority Critical patent/JPS61194379A/en
Publication of JPS61194379A publication Critical patent/JPS61194379A/en
Publication of JPH0543071B2 publication Critical patent/JPH0543071B2/ja
Granted 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
    • G01S13/9021—SAR image post-processing techniques
    • G01S13/9027—Pattern recognition for feature extraction

Abstract

PURPOSE:To reduce a memory region required in correction processing, by performing the earth rotation skew correction of satellite mounted synthetic aperture radar by the azimuth correction on one line and performing pixel interval correction by four range line data. CONSTITUTION:Raw data obtained by a satellite is taken in a data compression part 2 from a raw data input part 1 and image data, wherein information of each picture element was compressed, is formed in said compression part 2. The image data after compression is geometrically corrected in a geometrical correction part 3 but this correction is performed by a method wherein the image data after data compression is complemented at first by one range line in an azimuth direction on the basis of the correction amount from an earth rotation skew correction operation part 31 in an earth rotation skew correction part 32 and earth rotation skew correction is performed. Next, the correction data of one range line is formed from the data of four range lines in a range pixel interval correction part 34 and image data are superposed in a multilook processing part 4 to remove speckle noise.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は合成開口レーダ画像処理装置に関し、特に衛星
搭載合成開口レーダの幾何学的補正として地球自転スキ
ー−補正とレンジピクセル間隔補正を行う合成開口レー
ダ画像処理装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a synthetic aperture radar image processing device, and particularly to a synthetic aperture radar image processing device that performs earth rotation ski correction and range pixel spacing correction as geometric correction of a satellite-borne synthetic aperture radar. The present invention relates to an aperture radar image processing device.

〔従来の技術〕[Conventional technology]

従来、この種の合成開口レーダ画像処理装置は、幾何学
的補正の機能を持たないか、あるいは画像データ作成後
に幾何学的補正式を求めて補正を行うものとなっていた
。Conventionally, this type of synthetic aperture radar image processing apparatus either does not have a geometric correction function or performs correction by finding a geometric correction formula after image data is created.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上述した従来の合成開口レーダ画像処理装置は、画像作
成以前に幾何学的、補正が得られないため、画像処理の
中間段階の、例えば複素数データの段階で幾何学的補正
を行うことができないために、高分解能を保持した幾何
学補正ができないという欠点がある。In the conventional synthetic aperture radar image processing device described above, geometric correction cannot be obtained before image creation, so geometric correction cannot be performed at an intermediate stage of image processing, for example, at the stage of complex number data. However, it has the disadvantage that it is not possible to perform geometric correction while maintaining high resolution.

しかし、画像処理の中間段階、例えばマルチルック処理
以前でかつ複素数データの段階で補正を行おうとした場
合、データ量は最終画像データの数倍（通常８倍程度）
に及ぶため、補正処理に要するデータ記憶域が大きくな
り、実現が容易でないという困難があった。However, if you try to perform correction at an intermediate stage of image processing, for example before multi-look processing and at the stage of complex number data, the amount of data will be several times the final image data (usually about 8 times).
Therefore, the data storage area required for the correction process becomes large, and it is difficult to implement the correction process.

〔問題点を解決するための手段〕[Means for solving problems]

本発明の合成開口レーダ画像処理装置は、衛星搭載合成
量ロレーダ忙特有な地球自転スキュー歪とレンジスキュ
ー処理によって生じた歪を除去する機能を有し、かつデ
ータ記憶域をルンジライン分のデータしか必要としない
地球自転スキュー補正部と、レンジ方向のピクセル間隔
の非直線性を補正する機能を有し、かつデータ記憶域を
４レンジライン分のデータしか必要としないレンジピク
セル間隔補正部とを有している。The synthetic aperture radar image processing device of the present invention has a function of removing distortion caused by the earth rotation skew distortion and range skew processing that are unique to satellite-borne synthetic radar systems, and requires only data storage for lunge lines. and a range pixel interval correction unit that has the function of correcting non-linearity of the pixel interval in the range direction and requires data storage area of only 4 range lines of data. ing.

〔実施例〕〔Example〕

次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第１図は本発明の一実施例のプロ、り図である。FIG. 1 is a schematic diagram of an embodiment of the present invention.

生データ入力部１は衛星によつて取得された生データを
合成開口レーダ画像処理装置内に取込み、データ圧縮部
２は、生データ中に拡散して存在する各画素（ピクセル
）の情報を圧縮して画像データとする。幾何学的補正部
３は、圧縮後の画像データを幾何学的に補正する。地球
自転スキュー補正演算部３１は生データのへ、ダデータ
をもとに地球自転スキュー歪とレンジスキュー歪の補正
量を演算し、地球自転スキュー補正部３２へ送る。The raw data input unit 1 inputs the raw data acquired by the satellite into the synthetic aperture radar image processing device, and the data compression unit 2 compresses the information of each pixel that is diffused in the raw data. and use it as image data. The geometric correction unit 3 geometrically corrects the compressed image data. The earth rotation skew correction calculation unit 31 calculates correction amounts for earth rotation skew distortion and range skew distortion based on raw data and data, and sends them to the earth rotation skew correction unit 32.

地球自転スキュー補正部３２は、地球自転スキー−補正
演算部３１からの補正量をもとに、データ圧縮後の画像
データをルンジラインずつアジマス方向に補関し、地球
自転スキー−補正を行う。The earth rotation skew correction unit 32 interpolates the compressed image data in the azimuth direction for each lunge line based on the correction amount from the earth rotation ski correction calculation unit 31, and performs the earth rotation ski correction.

レンジピクセル間隔補正演算部３３は生データのへ、ダ
データをもとにレンジビクセル間隔歪の補正量を演算す
る。レンジピクセル間隔補正部３４は、レンジピクセル
間隔補正演算部３３からの補正量をもとに、地球自転ス
キュー補正後の４レンジラインのデータから補正後のデ
ータをルンジライン作成する。マルチルック処理部４は
、補正後の画像データをいわゆるノンコヒーレントに重
ね合せ、スペックルノイズを除去する。画像出力部５は
、マルチルック処理部４から出力された画像データをブ
ラウン管あるいは、磁気テープ装置等の出力機器へ出力
する。なお、マルチルック処理部４は、地球自転スキー
補正部３２と、レンジピクセル間隔補正部３４の間で実
施することも可能である。第２図には上述地球自転スキ
ュー補正とレンジピクセル間隔補正を説明するだめの模
式％式％ 地球自転スキュー補正演算部３１で使用する補正式の一
例線第（１）式に示される。The range pixel interval correction calculating section 33 calculates the correction amount of the range pixel interval distortion based on the raw data and the data. The range pixel interval correction section 34 creates lunge lines of corrected data from the data of the four range lines after earth rotation skew correction, based on the correction amount from the range pixel interval correction calculation section 33. The multi-look processing unit 4 superimposes the corrected image data in a so-called non-coherent manner and removes speckle noise. The image output unit 5 outputs the image data output from the multi-look processing unit 4 to an output device such as a cathode ray tube or a magnetic tape device. Note that the multi-look processing unit 4 can also be implemented between the earth rotation ski correction unit 32 and the range pixel interval correction unit 34. FIG. 2 shows an example of a correction formula used in the earth rotation skew correction calculating section 31 as a schematic diagram for explaining the above-mentioned earth rotation skew correction and range pixel interval correction.

但し　　　番 Ｘ、Ｙ：補正後の座標 ｘ’　、　ｙ’　：補正前の座標 ａｅ Ｗｅ：　　赤道自転角速度 Ｅ　：　地球半径 ψ　：　搏度 ａｅ　：　赤道半径 ｔ　＝　ＰＡ７／ＰＲ，Ｆ ＰＡＺ：方位方向画素番号 ＰＲＦ　　：パルス繰返し周波数 またレンジピクセル間隔補正演算部３３で使用する補正
式の一例は第（２）式に示されている。However, No. X, Y: Coordinates after correction Number PRF: Pulse repetition frequency or range An example of a correction formula used in the pixel interval correction calculation section 33 is shown in equation (2).

ΔＸ／＝ΔＸ　　ｓｉｎ　ｐ　　　　　　　（２）ΔＸ
：　補正後のレンジピクセル間隔 ΔＸ′：　　補正前の　　　Ｉ Ｅ　：　地球半径 Ｈ：　衛星高度 Ｒ：　衛星対目標間距離 〔発明の効果〕 以上説明したように本発明は、衛星搭載合成開口レーダ
の地球自転スキュー補正をルンジライン上のアジマスス
キュー補正によって行い、レンジビクセル間隔補正を４
レンジラインのデータを用いて、補正前のレンジライン
に平行な線上の補間によって行うことにより、補正処理
に要する記憶域を少なくシ、かつ衛星搭載合成開口レー
ダの特性に合った補正ができる効果がある。ΔX/=ΔX sin p (2) ΔX
: Range pixel interval ΔX' after correction: IE before correction: Earth radius H: Satellite altitude R: Satellite-to-target distance [Effects of the Invention] As explained above, the present invention provides Rotational skew correction is performed by azimuth skew correction on the lunge line, and range vixel interval correction is performed by 4
By using range line data and performing interpolation on a line parallel to the range line before correction, it is possible to reduce the storage area required for correction processing and to make corrections that match the characteristics of the satellite-mounted synthetic aperture radar. be.

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

第１図は本発明の一実施例のプロ、り図、第２図は地球
自転スキュ補正とレンジピクセル間隔補正の説明図であ
る。 １・・・・・・生データ入力部、２・・・・・・データ
圧縮部、３・・・・・・幾何学補正部、３１・・・・・
・地球自転スキュー補正演算部、３２−−−−−地球自
転スキュー補正部、３３・・−・・レンジビクセル間隔
補正演算部、３４−・・・・・レンジピクセル間隔補正
部、４・・・・・・マルチルック処理部、５・・・・・
・画像出力部。 【）ナシ　　　　ノ　　　　　　１ン１茅、２　　回FIG. 1 is a schematic diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of earth rotation skew correction and range pixel interval correction. 1...Raw data input section, 2...Data compression section, 3...Geometric correction section, 31...
-Earth rotation skew correction calculation unit, 32----Earth rotation skew correction unit, 33... Range pixel interval correction calculation unit, 34-... Range pixel interval correction unit, 4... ...Multi-look processing section, 5...
・Image output section. [)Nashi no 1 n 1 mo, 2 times

Claims (1)

【特許請求の範囲】[Claims] 衛星搭載合成開口レーダの画像処理において、合成開口
レーダの生データを装置内部に取込む生データ入力部と
、前記生データをレンジスキュー補正を有するデータ圧
縮によって画像データを作成するデータ圧縮部と、前記
画像データの幾何学的補正を行う幾何学補正部と、幾何
学補正後の画像データのスペックルノイズを減少させる
マルチルック処理部と、マルチルック処理後の画像デー
タを外部に取出す画像出力部とを具備する合成開口レー
ダ画像処理装置において、前記幾何学補正部に、レンジ
スキュー補正によるレンジ方向の歪と地球自転の影響に
よるアジマス方向のスキュー歪を複素数領域のアジマス
キュー補正によって補正する地球自転スキュー補正部と
、レンジ方向のピクセル間隔の非直線性を補正前のレン
ジラインに平行なレンジライン上の補間によって補正す
るレンジピクセル間隔補正部とを有することを特徴とす
る合成開口レーダ画像処理装置。In image processing of a satellite-borne synthetic aperture radar, a raw data input section that takes raw data of the synthetic aperture radar into the device, a data compression section that creates image data by compressing the raw data with range skew correction; a geometric correction section that performs geometric correction on the image data; a multi-look processing section that reduces speckle noise in the image data after the geometric correction; and an image output section that outputs the image data after the multi-look processing. In the synthetic aperture radar image processing device, the geometric correction unit includes an earth rotation system that corrects distortion in the range direction due to range skew correction and skew distortion in the azimuth direction due to the influence of earth rotation by azimuth skew correction in the complex domain. A synthetic aperture radar image processing device comprising: a skew correction section; and a range pixel spacing correction section that corrects non-linearity of pixel spacing in the range direction by interpolation on a range line parallel to the range line before correction. .
JP60035790A 1985-02-25 1985-02-25 Synthetic aperture radar image processing apparatus Granted JPS61194379A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60035790A JPS61194379A (en) 1985-02-25 1985-02-25 Synthetic aperture radar image processing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60035790A JPS61194379A (en) 1985-02-25 1985-02-25 Synthetic aperture radar image processing apparatus

Publications (2)

Publication Number Publication Date
JPS61194379A true JPS61194379A (en) 1986-08-28
JPH0543071B2 JPH0543071B2 (en) 1993-06-30

Family

ID=12451707

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60035790A Granted JPS61194379A (en) 1985-02-25 1985-02-25 Synthetic aperture radar image processing apparatus

Country Status (1)

Country Link
JP (1) JPS61194379A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7006031B1 (en) * 2004-10-19 2006-02-28 Raytheon Company Interrupt SAR image restoration using linear prediction and Range Migration Algorithm (RMA) processing
US7764220B1 (en) * 2009-04-22 2010-07-27 Raytheon Company Synthetic aperture radar incorporating height filtering for use with land-based vehicles
US8035545B2 (en) 2009-03-13 2011-10-11 Raytheon Company Vehicular surveillance system using a synthetic aperture radar
JP2019219356A (en) * 2018-06-22 2019-12-26 株式会社東芝 Image radar device and radar signal processing method therefor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57179769A (en) * 1981-04-30 1982-11-05 Toshiba Corp Correcting system for picture distortion of synthetic aperture-face radar

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57179769A (en) * 1981-04-30 1982-11-05 Toshiba Corp Correcting system for picture distortion of synthetic aperture-face radar

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7006031B1 (en) * 2004-10-19 2006-02-28 Raytheon Company Interrupt SAR image restoration using linear prediction and Range Migration Algorithm (RMA) processing
US8035545B2 (en) 2009-03-13 2011-10-11 Raytheon Company Vehicular surveillance system using a synthetic aperture radar
US7764220B1 (en) * 2009-04-22 2010-07-27 Raytheon Company Synthetic aperture radar incorporating height filtering for use with land-based vehicles
JP2019219356A (en) * 2018-06-22 2019-12-26 株式会社東芝 Image radar device and radar signal processing method therefor

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Publication number Publication date
JPH0543071B2 (en) 1993-06-30

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