JP2001091650A - Active Ground Control System for Synthetic Aperture Radar Image Precise Geometric Correction - Google Patents
Active Ground Control System for Synthetic Aperture Radar Image Precise Geometric CorrectionInfo
- Publication number
- JP2001091650A JP2001091650A JP26555899A JP26555899A JP2001091650A JP 2001091650 A JP2001091650 A JP 2001091650A JP 26555899 A JP26555899 A JP 26555899A JP 26555899 A JP26555899 A JP 26555899A JP 2001091650 A JP2001091650 A JP 2001091650A
- Authority
- JP
- Japan
- Prior art keywords
- aperture radar
- synthetic aperture
- active
- geometric correction
- radar 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.)
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- Position Fixing By Use Of Radio Waves (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
(57)【要約】
【課題】 合成開口レーダ画像の精密幾何補正における
地上基準点の選択が容易にでき、かつ正確な位置情報を
得ることができる合成開口レーダ画像精密幾何補正用地
上基準点装置を得る。
【解決手段】 アクティブリフレクタ等の能動型反射器
を主として構成される合成開口レーダ画像精密幾何補正
用地上基準点装置を合成開口レーダ画像撮像視野内に設
置し、それらの反射器からの強い反射によりできる合成
開口レーダ画像上の白い輝点を地上基準点とし、正確な
精密幾何補正画像を得る。
(57) [Problem] A ground reference point device for precise geometric correction of a synthetic aperture radar image capable of easily selecting a ground reference point in precise geometric correction of a synthetic aperture radar image and obtaining accurate positional information. Get. SOLUTION: A ground reference point device for precise geometric correction of a synthetic aperture radar image mainly including an active reflector such as an active reflector is installed in a synthetic aperture radar image imaging field of view, and strong reflection from the reflectors is used. An accurate precise geometrically corrected image is obtained by using a white luminescent spot on a possible synthetic aperture radar image as a ground reference point.
Description
【０００１】[0001]
【発明の属する技術分野】この発明は衛星等の飛しょう
体により取得した合成開口レーダ画像を精密幾何補正す
る際の地上基準点を得るための装置に関するものであ
る。なお、ここでは説明の便宜上衛星で取得した合成開
口レーダ画像を精密幾何補正する際の地上基準点を得る
ための装置について以下に説明する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for obtaining a ground reference point for precise geometric correction of a synthetic aperture radar image acquired by a flying object such as a satellite. Here, for convenience of explanation, an apparatus for obtaining a ground reference point when performing precise geometric correction on a synthetic aperture radar image acquired by a satellite will be described below.
【０００２】[0002]
【従来の技術】衛星画像による広域の地表観測は、作物
の収穫高見積り、森林伐採等環境破壊の監視、さらには
洪水等の災害の被害状況の把握を行う上で重要である。
特に合成開口レーダ画像による地表観測は、全天候性と
いった点からも重要視されている。このような衛星画像
による広域地表観測においては、衛星画像の画像座標系
を地図座標系により正確に対応させることが重要とな
る。これらの補正は、一般には衛星の位置、姿勢データ
や地球の幾何学的なモデル、およびセンサの幾何学的特
性データを用いて行われるが、これらの諸データに含ま
れる誤差に起因する歪を補正することはできない。そこ
で、地図などで緯経度が既知の点（地上基準点）と対応
する画像上の点とを対とするデータを用いることにより
それらの歪を除去することで画像座標系と地図座標系と
の対応精度を向上させる。この処理を精密幾何補正と呼
ぶ。2. Description of the Related Art Wide-area surface observations using satellite images are important in estimating crop yields, monitoring destruction of the environment such as deforestation, and grasping the damage status of disasters such as floods.
In particular, observation of the ground surface using synthetic aperture radar images is regarded as important in terms of all weather. In such a wide-area surface observation using a satellite image, it is important to make the image coordinate system of the satellite image more accurately correspond to the map coordinate system. These corrections are generally performed using satellite position and attitude data, a geometric model of the earth, and sensor geometric characteristic data.However, distortions caused by errors contained in these data are corrected. It cannot be corrected. Therefore, by using data that pairs a point with a known latitude and longitude (ground reference point) in a map or the like and a point on the corresponding image to remove those distortions, the image coordinate system and the map coordinate system can be compared. Improve correspondence accuracy. This process is called a precise geometric correction.
【０００３】図１０は精密幾何補正の処理を説明する図
であり、１は精密幾何補正される衛星画像、２は地図、
３は精密幾何補正される画像上の地上基準点、４は地図
上の地上基準点、５は精密幾何補正された衛星画像であ
る。一般的には、精密幾何補正される衛星画像１から位
置が確実に特定できる画素を見つけ出し、それを精密幾
何補正される画像上の地上基準点３とする。次に、その
精密幾何補正される画像上の地上基準点３に対応する位
置を地図２から探し、その座標を地図上の地上基準点４
とする。これらの地上基準点対を複数選び、アフィン変
換等で精密幾何補正される衛星画像１を座標変換するこ
とで精密幾何補正された衛星画像５を得る。これらの地
上基準点には、一般的には建造物、橋梁、特徴的な地形
等を目視により判断された画素が用いられる。FIG. 10 is a view for explaining the processing of the precise geometric correction. 1 is a satellite image to be subjected to the fine geometric correction, 2 is a map,
Reference numeral 3 denotes a ground reference point on the image subjected to the fine geometric correction, 4 denotes a ground reference point on the map, and 5 denotes a satellite image subjected to the fine geometric correction. Generally, a pixel whose position can be surely specified is found from the satellite image 1 to be precisely geometrically corrected, and is set as the ground reference point 3 on the image to be precisely geometrically corrected. Next, a position corresponding to the ground reference point 3 on the image subjected to the precise geometric correction is searched from the map 2, and its coordinates are found on the map at the ground reference point 4.
And A plurality of these ground reference point pairs are selected, and the satellite image 1 that is precisely geometrically corrected by affine transformation or the like is subjected to coordinate conversion to obtain a satellite image 5 that is precisely geometrically corrected. For these ground reference points, pixels that are visually determined for buildings, bridges, characteristic terrain, and the like are generally used.
【０００４】[0004]
【発明が解決しようとする課題】従来行われている衛星
画像の精密幾何補正では、その補正の精度が目視による
地上基準点の選択に大きく依存するといっても過言では
ない。光学画像の精密幾何補正の場合、画像そのものが
写真に近いものであり人間の目に馴染みやすいといった
ことから、地上基準点の選択が比較的容易である。これ
に対し合成開口レーダ画像の精密幾何補正の場合、画像
は電波の反射を映し出したものであり、またレイオーバ
ー、フォアショートニングといった合成開口レーダ画像
特有の現象による歪が生じることからも地上基準点の選
択は非常に困難であった。さらに、反射手段として受動
型反射器を用いることにも可能であるが、その場合電波
の波長により反射体を非常に大きくする必要があり、ま
た多偏波の電波にも対応できない。しかしながら合成開
口レーダ画像は、取得対象地域の雲量等の気象条件に依
存せず継続的に得られることから、近年その利用が非常
に期待されている。It is not an exaggeration to say that in the precision geometric correction of satellite images conventionally performed, the accuracy of the correction largely depends on the selection of ground reference points by visual observation. In the case of the precise geometric correction of the optical image, the ground reference point is relatively easy to select because the image itself is close to a photograph and is easily recognized by human eyes. On the other hand, in the case of precise geometric correction of the synthetic aperture radar image, the image reflects the reflection of radio waves, and distortion due to phenomena peculiar to the synthetic aperture radar image such as layover and fore shortening occurs, so that the ground reference point can be obtained. The choice was very difficult. Further, it is possible to use a passive reflector as the reflection means, but in that case, it is necessary to make the reflector very large depending on the wavelength of the radio wave, and it cannot cope with multi-polarized radio waves. However, since synthetic aperture radar images can be obtained continuously without depending on weather conditions such as the amount of clouds in the acquisition target area, their use is highly expected in recent years.
【０００５】この発明はかかる課題を解決するためにな
されたものであり、合成開口レーダ画像の精密幾何補正
における地上基準点の選択が容易にでき、かつ正確な位
置情報を得ることができる合成開口レーダ画像精密幾何
補正用能動型地上基準点装置を提供するものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and a synthetic aperture which can easily select a ground reference point in precise geometric correction of a synthetic aperture radar image and can obtain accurate position information. An object of the present invention is to provide an active ground control device for precise geometric correction of radar images.
【０００６】[0006]
【課題を解決するための手段】第１の発明の合成開口レ
ーダ画像精密幾何補正用能動型地上基準点装置は、衛星
に搭載された合成開口レーダから照射される電波を前記
衛星の方向に反射するためのアクティブリフレクタ等の
能動型反射器を用いた能動型反射手段を備えるものであ
る。According to a first aspect of the present invention, there is provided an active ground control device for precise geometric correction of a synthetic aperture radar image which reflects radio waves emitted from a synthetic aperture radar mounted on a satellite in the direction of the satellite. And an active reflector using an active reflector such as an active reflector.
【０００７】また第２の発明の合成開口レーダ画像精密
幾何補正用能動型地上基準点装置は、前記能動型反射手
段を複数備えるものである。Further, a second aspect of the present invention provides an active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image, comprising a plurality of the active reflecting means.
【０００８】第３の発明の合成開口レーダ画像精密幾何
補正用能動型地上基準点装置は、モータ等の動力により
前記能動型反射手段の向きを前記衛星等の飛しょう体の
飛行方向に向けるための反射体制御手段を備えるもので
ある。A third aspect of the present invention provides an active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image for turning the direction of the active reflecting means toward the flight direction of a flying object such as a satellite by the power of a motor or the like. Reflector control means.
【０００９】また第４の発明の合成開口レーダ画像精密
幾何補正用能動型地上基準点装置は、前記能動型反射手
段とを移動するための自動車等の移動手段を備えるもの
である。A fourth aspect of the present invention provides an active ground reference point device for precise geometric correction of a synthetic aperture radar image, comprising a moving means such as an automobile for moving the active reflecting means.
【００１０】第５の発明の合成開口レーダ画像精密幾何
補正用能動型地上基準点装置は、前記能動型反射手段と
前記反射体制御手段とを移動するための自動車等の移動
手段を備えるものである。According to a fifth aspect of the present invention, there is provided an active ground reference point device for synthetic aperture radar image precise geometric correction, comprising a moving means such as an automobile for moving the active reflecting means and the reflector controlling means. is there.
【００１１】第６の発明の合成開口レーダ画像精密幾何
補正用能動型地上基準点装置は、前記能動型反射手段の
位置を正確に測位するためにＤＧＰＳ等の航法システム
を用いた測位手段を備えるものである。A sixth aspect of the present invention is an active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image, which includes positioning means using a navigation system such as DGPS for accurately positioning the position of the active reflecting means. Things.
【００１２】[0012]
【発明の実施の形態】実施の形態１．図１はこの発明に
よる合成開口レーダ画像精密幾何補正用能動型地上基準
点装置の実施の形態１の構成を示すもので、６は能動型
反射手段、７は衛星からの送信電波、８は能動型反射手
段６の受信部、９は能動型反射手段６の送信部、１０は
衛星への送信電波である。図１において衛星から送信さ
れた電波７は、能動型反射手段６の受信部８で受信さ
れ、能動型反射手段６で増幅された後、能動型反射手段
６の送信部９より衛星への送信電波１０として送信され
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows the configuration of a first embodiment of an active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image according to the present invention, in which 6 is an active reflecting means, 7 is a transmitted radio wave from a satellite, and 8 is an active. The receiving section of the type reflecting means 6, 9 is the transmitting section of the active type reflecting means 6, and 10 is the radio wave transmitted to the satellite. In FIG. 1, a radio wave 7 transmitted from a satellite is received by a receiver 8 of the active reflector 6 and amplified by the active reflector 6, and then transmitted from the transmitter 9 of the active reflector 6 to the satellite. It is transmitted as an electric wave 10.
【００１３】以下に、前記合成開口レーダ画像精密幾何
補正用地上基準点装置を用いた合成開口レーダ画像精密
幾何補正の一例を示す。図２は合成開口レーダ画像精密
幾何補正用地上基準点装置と衛星の関係を示す図であ
り、１１は地表面、１２は撮像視野、１３は衛星、１４
は合成開口レーダ画像精密幾何補正用地上基準点装置で
ある。図２において、衛星１３から送信された電波７は
地表面１１上の撮像視野１２内に設置された合成開口レ
ーダ画像精密幾何補正用地上基準点装置１４で受信され
増幅された後、衛星への送信電波１０として送信され
る。そして再び衛星１３に戻る。図３は合成開口レーダ
画像精密幾何補正用地上基準点装置を用いて撮像された
合成開口レーダ画像の図であり、１５は合成開口レーダ
画像、１６は白い輝点である。合成開口レーダ画像精密
幾何補正用地上基準点装置１４により電波が反射された
地点は、それ以外の地点より強い反射が起こるため図３
の合成開口レーダ画像１５において白い輝点１６のよう
に映し出される。この白い輝点１６に対応する緯経度情
報は合成開口レーダ画像精密幾何補正用地上基準点装置
１４の設置位置から既知であるため、前記合成開口レー
ダ画像精密幾何補正用地上基準点装置を撮像視野１２内
に複数設置することにより合成開口レーダ画像１５を容
易に精密幾何補正することができる。An example of the precise geometric correction of the synthetic aperture radar image using the ground reference point device for precise geometric correction of the synthetic aperture radar image will be described below. FIG. 2 is a diagram showing a relationship between a ground reference point device for synthetic aperture radar image precise geometric correction and a satellite, where 11 is the ground surface, 12 is an imaging field of view, 13 is a satellite, 14
Is a ground control point device for precise geometric correction of synthetic aperture radar images. In FIG. 2, a radio wave 7 transmitted from a satellite 13 is received and amplified by a synthetic aperture radar image precise geometric correction ground reference point device 14 installed in an imaging field of view 12 on the ground surface 11, and then transmitted to the satellite. It is transmitted as transmission radio wave 10. Then, the process returns to the satellite 13 again. FIG. 3 is a diagram of a synthetic aperture radar image captured by using the synthetic aperture radar image ground reference point device for precise geometric correction, wherein 15 is a synthetic aperture radar image, and 16 is a white bright spot. The point where the radio wave is reflected by the ground reference point device 14 for the synthetic aperture radar image precise geometric correction is reflected more strongly than the other points.
Are projected like white bright spots 16 in the synthetic aperture radar image 15 of FIG. Since the latitude / longitude information corresponding to the white bright point 16 is known from the installation position of the synthetic aperture radar image precise geometric correction ground reference point device 14, the synthetic aperture radar image precise geometric correction ground reference point device is imaged in the field of view. By installing a plurality of the apertures in the aperture 12, the precise geometric correction of the synthetic aperture radar image 15 can be easily performed.
【００１４】実施の形態２．図４はこの発明のよる合成
開口レーダ画像精密幾何補正用能動型地上基準点装置の
実施の形態２の構成を示すもので、１７は左向きに取り
付けられた能動型反射手段、１８は右向きに取り付けら
れた能動型反射手段、１９は左上方向から受信された電
波、２０は左上方向に送信される電波、２１は右上方向
から受信された電波、２２は右上方向に送信される電波
である。左上方向から受信された電波１９は、左向きに
取り付けられた能動型反射手段１７により増幅され、左
上方向に送信される電波２０として送信される。また、
右上方向から受信された電波２１は、右向きに取り付け
られた能動型反射手段１８により増幅され、右上方向に
送信される電波２２として送信される。Embodiment 2 FIG. FIG. 4 shows the configuration of an active ground reference point device for synthetic aperture radar image precise geometric correction according to a second embodiment of the present invention, in which reference numeral 17 denotes an active reflecting means mounted to the left, and reference numeral 18 denotes a right mounting. The active reflection means, 19 is a radio wave received from the upper left direction, 20 is a radio wave transmitted in the upper left direction, 21 is a radio wave received from the upper right direction, and 22 is a radio wave transmitted in the upper right direction. The radio wave 19 received from the upper left direction is amplified by the active reflection means 17 attached to the left and transmitted as the radio wave 20 transmitted in the upper left direction. Also,
The radio wave 21 received from the upper right direction is amplified by the active reflection means 18 attached to the right and transmitted as the radio wave 22 transmitted to the upper right direction.
【００１５】実施の形態３．図５はこの発明のよる合成
開口レーダ画像精密幾何補正用能動型地上基準点装置の
実施の形態３の構成を示すもので、２３は反射体制御手
段である。反射体制御手段２３は、衛星からの送信電波
７の入射方向に従い能動型反射手段６の向きを制御す
る。そして衛星から送信された電波７は、能動型反射手
段６により増幅され、衛星への送信電波１０として送信
される。Embodiment 3 FIG. 5 shows the configuration of an active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image according to a third embodiment of the present invention. Reference numeral 23 denotes reflector control means. The reflector control means 23 controls the direction of the active reflection means 6 according to the incident direction of the transmission radio wave 7 from the satellite. Then, the radio wave 7 transmitted from the satellite is amplified by the active reflection means 6 and transmitted as a transmission radio wave 10 to the satellite.
【００１６】実施の形態４．図６はこの発明のよる合成
開口レーダ画像精密幾何補正用能動型地上基準点装置の
実施の形態４の構成を示すもので、２４は移動手段であ
る。能動型反射手段６は、移動手段２４により任意の位
置に移動する。そして衛星からの受信電波７は、能動型
反射手段６により増幅され、衛星への送信電波１０とし
て送信される。Embodiment 4 FIG. 6 shows a configuration of an active ground control point apparatus for precise geometric correction of a synthetic aperture radar image according to a fourth embodiment of the present invention, in which reference numeral 24 denotes a moving means. The active reflecting means 6 is moved to an arbitrary position by the moving means 24. The received radio wave 7 from the satellite is amplified by the active reflection means 6 and transmitted as a transmitted radio wave 10 to the satellite.
【００１７】実施の形態５．図７はこの発明のよる合成
開口レーダ画像精密幾何補正用地上基準点装置の実施の
形態５の構成を示すものである。能動型反射手段６は、
移動手段２４により任意の位置に移動する。そして反射
体制御手段２３は、衛星からの送信電波７の入射方向の
従い能動型反射手段６の向きを制御する。それにより衛
星からの受信電波７は、能動型反射手段６により増幅さ
れ、衛星への送信電波１０として送信される。Embodiment 5 FIG. 7 shows the configuration of Embodiment 5 of the ground reference point apparatus for synthetic aperture radar image precise geometric correction according to the present invention. The active reflection means 6
The moving means 24 moves to an arbitrary position. Then, the reflector control means 23 controls the direction of the active reflection means 6 according to the incident direction of the transmission radio wave 7 from the satellite. As a result, the radio wave 7 received from the satellite is amplified by the active reflection means 6 and transmitted as a radio wave 10 transmitted to the satellite.
【００１８】実施の形態６．図８はこの発明のよる合成
開口レーダ画像精密幾何補正用能動型地上基準点装置の
実施の形態６の構成を示すもので、２５はＤＧＰＳ等の
航法システムを用いた測位手段である。能動型反射手段
６は、移動手段２４により任意の位置に移動する。そし
て衛星からの受信電波７は、能動型反射手段６により増
幅され、衛星への送信電波１０として送信される。その
際、能動型反射手段６の位置情報が測位手段２５により
測位され、その情報が精密幾何補正を行う際の位置情報
として利用される。Embodiment 6 FIG. FIG. 8 shows the configuration of a sixth embodiment of the active ground reference point device for synthetic aperture radar image precise geometric correction according to the present invention, and 25 is a positioning means using a navigation system such as DGPS. The active reflecting means 6 is moved to an arbitrary position by the moving means 24. The received radio wave 7 from the satellite is amplified by the active reflection means 6 and transmitted as a transmitted radio wave 10 to the satellite. At this time, the position information of the active reflecting means 6 is measured by the positioning means 25, and the information is used as position information when performing precise geometric correction.
【００１９】実施の形態７．図９はこの発明のよる合成
開口レーダ画像精密幾何補正用能動型地上基準点装置の
実施の形態７の構成を示すものである。能動型反射手段
６は、移動手段２４により任意の位置に移動する。そし
て反射体制御手段２３は、衛星からの送信電波７の入射
方向の従い能動型反射手段６の向きを制御する。それに
より衛星からの受信電波７は、能動型反射手段６により
増幅され、衛星への送信電波１０として送信される。そ
の際、能動型反射手段６の位置情報が測位手段２５によ
り測位され、その情報が精密幾何補正を行う際の位置情
報として利用される。Embodiment 7 FIG. 9 shows the configuration of Embodiment 7 of the active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image according to the present invention. The active reflecting means 6 is moved to an arbitrary position by the moving means 24. Then, the reflector control means 23 controls the direction of the active reflection means 6 according to the incident direction of the transmission radio wave 7 from the satellite. As a result, the radio wave 7 received from the satellite is amplified by the active reflection means 6 and transmitted as a radio wave 10 transmitted to the satellite. At this time, the position information of the active reflecting means 6 is measured by the positioning means 25, and the information is used as position information when performing precise geometric correction.
【００２０】[0020]
【発明の効果】第１の発明によれば、従来困難であった
合成開口レーダ画像の精密幾何補正における地上基準点
の選択が容易にでき、かつ正確な位置情報を得ることが
できる。これにより、前記合成開口レーダ画像の精密幾
何補正における作業の簡単化と前記合成開口レーダ画像
を精密幾何補正することにより生成される精密幾何補正
画像の精度向上の効果が得られる。また、反射手段とし
て能動型反射器を用いることによりコーナリフレクタ等
の受動型反射器を用いた場合に比べ反射手段の小型化す
ることが可能となり、そして様々な偏波の電波にも対応
することができる。さらに、近年合成開口レーダの全天
候性から合成開口レーダ画像による干渉ＳＡＲ技術等を
利用した数値標高地図の作成が注目されており、前記数
値標高地図の精度向上の効果も得られる。According to the first aspect, it is possible to easily select a ground reference point in precise geometric correction of a synthetic aperture radar image, which has been difficult in the past, and to obtain accurate position information. Thereby, the effect of simplifying the operation in the precise geometric correction of the synthetic aperture radar image and improving the precision of the precise geometric correction image generated by performing the precise geometric correction of the synthetic aperture radar image can be obtained. In addition, the use of an active reflector as the reflection means makes it possible to reduce the size of the reflection means as compared to the case of using a passive reflector such as a corner reflector, and to cope with radio waves of various polarizations. Can be. Further, in recent years, creation of a digital elevation map using an interference SAR technique or the like based on a synthetic aperture radar image has attracted attention due to the all-weather nature of the synthetic aperture radar, and the effect of improving the accuracy of the digital elevation map is also obtained.
【００２１】また、第２の発明によれば、合成開口レー
ダ画像を撮像する飛しょう体からの撮像方向が常に決ま
っている場合においても、合成開口レーダ画像精密幾何
補正用地上基準点装置の設置状況を変更せずに、第１の
発明と同様の効果が得られる。According to the second aspect of the present invention, even when the imaging direction from the flying object for imaging the synthetic aperture radar image is always determined, the ground reference point device for precise geometric correction of the synthetic aperture radar image is installed. The same effect as the first invention can be obtained without changing the situation.
【００２２】第３の発明によれば、合成開口レーダ画像
を撮像する飛しょう体からの撮像方向が任意の場合にお
いても、合成開口レーダ画像精密幾何補正用地上基準点
装置の設置状況を変更せずに、第１の発明と同様の効果
が得られる。According to the third aspect of the present invention, the installation state of the ground reference point device for synthetic aperture radar image precise geometric correction can be changed even when the imaging direction from the flying object for imaging the synthetic aperture radar image is arbitrary. Instead, an effect similar to that of the first invention is obtained.
【００２３】また、第４の発明によれば、合成開口レー
ダ画像を撮像する飛しょう体からの撮像領域の広さが任
意の場合においても、その撮像領域へ移動することによ
り、第１の発明と同様の効果が得られる。Further, according to the fourth aspect of the present invention, even if the area of the imaging area from the flying object for imaging the synthetic aperture radar image is arbitrary, the imaging area is moved to the imaging area. The same effect can be obtained.
【００２４】第５の発明によれば、合成開口レーダ画像
を撮像する飛しょう体からの撮像領域の広さが任意でか
つ撮像方向が任意の場合においても、その撮像領域へ移
動することにより、第１の発明と同様の効果が得られ
る。According to the fifth aspect, even when the area of the imaging area from the flying object for imaging the synthetic aperture radar image is arbitrary and the imaging direction is arbitrary, the imaging area is moved to the imaging area. The same effect as that of the first invention can be obtained.
【００２５】また、第６の発明によれば、合成開口レー
ダ画像を撮像する飛しょう体からの撮像領域の広さが任
意の場合においても、その撮像領域へ移動することによ
り、第１の発明と同様の効果が得られる。さらに、ＤＧ
ＰＳ等の航法システムを用いた測位手段により測位され
た位置情報を地上基準点の位置情報として利用すること
ができる。According to the sixth aspect of the present invention, even when the area of the imaging area from the flying object for imaging the synthetic aperture radar image is arbitrary, the imaging area is moved to the imaging area. The same effect can be obtained. In addition, DG
Position information measured by positioning means using a navigation system such as a PS can be used as position information of a ground reference point.
【００２６】さらに、第６の発明によれば、合成開口レ
ーダ画像を撮像する飛しょう体からの撮像領域の広さが
任意でかつ撮像方向が任意の場合においても、その撮像
領域へ移動することにより、第１の発明と同様の効果が
得られる。さらに、ＤＧＰＳ等の航法システムを用いた
測位手段により測位された位置情報を地上基準点の位置
情報として利用することができる。Furthermore, according to the sixth aspect, even when the area of the imaging area from the flying object for imaging the synthetic aperture radar image is arbitrary and the imaging direction is arbitrary, the imaging area is moved to the imaging area. Thereby, the same effect as that of the first invention can be obtained. Further, position information measured by positioning means using a navigation system such as DGPS can be used as position information of a ground reference point.
【図１】 この発明による合成開口レーダ画像精密幾何
補正用能動型地上基準点装置の実施の形態１の構成を示
す図である。FIG. 1 is a diagram showing the configuration of a first embodiment of an active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image according to the present invention.
【図２】 実施の形態１の前記合成開口レーダ画像精密
幾何補正用地上基準点装置と衛星の関係を示す図であ
る。FIG. 2 is a diagram illustrating a relationship between a ground reference point device for precise geometric correction of the synthetic aperture radar image and a satellite according to the first embodiment.
【図３】 実施の形態１の前記合成開口レーダ画像精密
幾何補正用地上基準点装置を用いて撮像された合成開口
レーダ画像の図である。FIG. 3 is a diagram of a synthetic aperture radar image captured using the ground reference point device for precise geometric correction of the synthetic aperture radar image according to the first embodiment;
【図４】 この発明による合成開口レーダ画像精密幾何
補正用能動型地上基準点装置の実施の形態２の構成を示
す図である。FIG. 4 is a diagram showing the configuration of a second embodiment of the active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image according to the present invention.
【図５】 この発明による合成開口レーダ画像精密幾何
補正用能動型地上基準点装置の実施の形態３の構成を示
す図である。FIG. 5 is a diagram illustrating a configuration of a third embodiment of an active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image according to the present invention.
【図６】 この発明による合成開口レーダ画像精密幾何
補正用能動型地上基準点装置の実施の形態４の構成を示
す図である。FIG. 6 is a diagram showing a configuration of a fourth embodiment of an active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image according to the present invention.
【図７】 この発明による合成開口レーダ画像精密幾何
補正用能動型地上基準点装置の実施の形態５の構成を示
す図である。FIG. 7 is a diagram showing a configuration of a fifth embodiment of the active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image according to the present invention.
【図８】 この発明による合成開口レーダ画像精密幾何
補正用能動型地上基準点装置の実施の形態６の構成を示
す図である。FIG. 8 is a diagram showing a configuration of a sixth embodiment of an active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image according to the present invention.
【図９】 この発明による合成開口レーダ画像精密幾何
補正用能動型地上基準点装置の実施の形態７の構成を示
す図である。FIG. 9 is a diagram showing a configuration of a seventh embodiment of an active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image according to the present invention.
【図１０】 精密幾何補正の処理を説明する図である。FIG. 10 is a diagram illustrating a process of precise geometric correction.
１ 精密幾何補正される衛星画像、２ 地図、３ 精密
幾何補正される画像上の地上基準点、４ 地図上の地上
基準点、５ 精密幾何補正された衛星画像、６ 能動型
反射手段、７ 衛星からの送信電波、８ 能動型反射手
段６の受信部、９ 能動型反射手段６の送信部、１０
衛星への送信電波、１１ 地表面、１２ 撮像視野、１
３ 衛星、１４ 合成開口レーダ画像精密幾何補正用能
動型地上基準点装置、１５ 合成開口レーダ画像、
１６ 白い輝点、１７ 能動型反射手段、１８ 能動型
反射手段、１９ 左上方向から受信された電波、２０左
上方向に送信される電波、２１ 右上方向から受信され
た電波、 ２２右上方向に送信される電波、２３
反射体制御手段、２４ 移動手段、２５測位手段。1 satellite image to be precisely geometrically corrected, 2 maps, 3 ground reference points on the image to be precisely geometrically corrected, 4 ground reference points on the map, 5 satellite images with precise geometric correction, 6 active reflection means, 7 satellites , A transmission section of the active reflection means 6, a transmission section of the active reflection means 6,
Radio wave transmitted to satellite, 11 ground surface, 12 field of view, 1
3 satellites, 14 synthetic aperture radar image Active ground reference point device for precise geometric correction, 15 synthetic aperture radar image,
16 white bright spots, 17 active reflection means, 18 active reflection means, 19 radio waves received from the upper left direction, 20 radio waves transmitted in the upper left direction, 21 radio waves received in the upper right direction, 22 radio waves transmitted in the upper right direction Radio waves, 23
Reflector control means, 24 moving means, 25 positioning means.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 水野 政治 東京都千代田区丸の内二丁目２番３号 三 菱電機株式会社内 (72)発明者 高橋 史子 東京都千代田区丸の内二丁目２番３号 三 菱電機株式会社内 (72)発明者 濱窪 眞紀 東京都千代田区丸の内二丁目２番３号 三 菱電機株式会社内 Ｆターム(参考） 5J062 AA00 BB00 CC07 DD21 5J070 AE07 AF08 AK22 BE04 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mizuno Politics 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Fumiko Takahashi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. (72) Inventor Maki Hamakubo 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5J062 AA00 BB00 CC07 DD21 5J070 AE07 AF08 AK22 BE04
Claims (6)
開口レーダ画像を精密幾何補正する際の地上基準点を得
る 合成開口レーダ画像精密幾何補正用地上基準点装置
において、前記合成開口レーダから照射される電波を前
記飛しょう体の方向に反射するためのアクティブリフレ
クタ等の能動型反射器を用いた能動型反射手段を備えた
ことを特徴とする合成開口レーダ画像精密幾何補正用能
動型地上基準点装置。1. A ground reference point for precise geometric correction of a synthetic aperture radar image acquired by a flying object such as a satellite, etc. In a ground reference point device for synthetic aperture radar image precise geometric correction, irradiation from the synthetic aperture radar is performed. An active ground reference for accurate geometric correction of a synthetic aperture radar image, characterized by comprising active reflecting means using an active reflector such as an active reflector for reflecting a radio wave to be emitted in the direction of the flying object. Point device.
特徴とする請求項１記載の合成開口レーダ画像精密幾何
補正用能動型地上基準点装置。2. The active ground reference point apparatus for precise geometric correction of a synthetic aperture radar image according to claim 1, wherein a plurality of said active reflecting means are provided.
段の向きを前記衛星等の飛しょう体の飛行方向に向ける
ための反射体制御手段を設けたことを特徴とする請求項
１記載の合成開口レーダ画像精密幾何補正用能動型地上
基準点装置。3. The combination according to claim 1, further comprising reflector control means for directing the direction of the active reflection means to the flight direction of the flying object such as the satellite by the power of a motor or the like. Active ground control system for precise geometric correction of aperture radar images.
動車等の移動手段を設けたことを特徴とする請求項１〜
３いずれか記載の合成開口レーダ画像精密幾何補正用能
動型地上基準点装置。4. A moving means, such as an automobile, for moving the active reflecting means, is provided.
3. An active ground control point device for precise geometric correction of a synthetic aperture radar image according to claim 3.
段を移動するための自動車等の移動手段を設けたことを
特徴とする請求項３記載の合成開口レーダ画像精密幾何
補正用地上基準点装置。5. A ground reference point for precise geometric correction of a synthetic aperture radar image according to claim 3, further comprising moving means such as an automobile for moving said active reflecting means and said reflector controlling means. apparatus.
めにＤＧＰＳ等の航法システムを用いた測位手段を設け
たことを特徴とする請求項４又は５記載の合成開口レー
ダ画像精密幾何補正用能動型地上基準点装置。6. A synthetic aperture radar image for precise geometric correction according to claim 4, wherein positioning means using a navigation system such as DGPS is provided for positioning the position of said active reflection means. Active ground control device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26555899A JP2001091650A (en) | 1999-09-20 | 1999-09-20 | Active Ground Control System for Synthetic Aperture Radar Image Precise Geometric Correction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26555899A JP2001091650A (en) | 1999-09-20 | 1999-09-20 | Active Ground Control System for Synthetic Aperture Radar Image Precise Geometric Correction |
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| Publication Number | Publication Date |
|---|---|
| JP2001091650A true JP2001091650A (en) | 2001-04-06 |
Family
ID=17418790
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26555899A Pending JP2001091650A (en) | 1999-09-20 | 1999-09-20 | Active Ground Control System for Synthetic Aperture Radar Image Precise Geometric Correction |
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