WO2012101072A1 - Reflecteur passif d'onde electromagnetique pour la mesure de deformation locale de structure a la surface de la terre - Google Patents
Reflecteur passif d'onde electromagnetique pour la mesure de deformation locale de structure a la surface de la terre Download PDFInfo
- Publication number
- WO2012101072A1 WO2012101072A1 PCT/EP2012/050927 EP2012050927W WO2012101072A1 WO 2012101072 A1 WO2012101072 A1 WO 2012101072A1 EP 2012050927 W EP2012050927 W EP 2012050927W WO 2012101072 A1 WO2012101072 A1 WO 2012101072A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- slot
- plate
- rectilinear
- reflector
- earth
- 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.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/18—Reflecting surfaces; Equivalent structures comprising plurality of mutually inclined plane surfaces, e.g. corner reflector
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions [2D], e.g. paraboloidal
Definitions
- the present invention relates to a passive electromagnetic wave reflector for the measurement of local deformation of a structure located on the surface of the Earth.
- Passive electromagnetic wave reflectors also known as permanent scatterers or radar reflectors, are used to measure the deformation of soils and objects on the surface of the Earth.
- An electromagnetic wave is sent from a satellite to a radar reflector on the surface of the Earth.
- the electromagnetic wave reflected by the radar reflector is then sent back to the satellite.
- the measurement of the deformation is carried out, in the aim direction of the satellite, by using images taken at successive dates.
- the deformation measurement can reach a submillimetric accuracy.
- Figures 1-4 represent these four modes:
- FIG. 1 represents the ascending mode with aiming on the right
- FIG. 2 represents the ascending mode with aiming on the left
- FIG. 3 represents the descending mode with aiming on the right
- the ascending or descending mode is defined according to whether the trajectory of the satellite S "ascends” or “descends” the north-south axis of the earth T and the aiming to the right or to the left is defined by the orientation of the beam F emitted by the satellite relative to the plane defined by the trajectory of the satellite.
- Radar reflectors exist in the natural state or in the artificial state. In their natural state, radar reflectors are most often found in human infrastructures. In areas where there is no human infrastructure or little infrastructure, artificial radar reflectors are especially designed for measuring deformations.
- the best-known radar reflectors are generally cube-corner shaped, the cube corner being suitably positioned for satellite shooting.
- the main diagonal of the cube corner is preferably directed towards the satellite.
- This orientation of the cube corner with respect to the satellite limits the taking of useful images, both because of the trajectory of the satellite and because of the shooting mode of the satellite.
- These reflectors are thus dedicated to a satellite and an aiming mode, ascending or descending.
- the radar reflector of the invention does not have this disadvantage.
- the invention relates to a passive reflector of electromagnetic wave for the measurement of local deformation of a structure located on the surface of the Earth, the reflector being able to reflect, towards a satellite orbiting the Earth, a electromagnetic wave that it receives from said satellite.
- the passive reflector comprises:
- planar element with respect to the surface of the Earth, the planar element having a rectilinear side in contact with the structure located on the surface of the Earth and aligned along the axis of the poles of the Earth, and
- a mechanical structure having a first part situated on a first side of the plane element and a second part situated on a second side of the plane element, opposite the first side, the mechanical structure forming, on either side of the plane element, a rectilinear edge, the rectilinear edge and the rectilinear side being substantially located in the same plane perpendicular to the plane defined by the planar element and constituting means for holding the reflector on the plane.
- the first part of the mechanical structure and the second part of the mechanical structure being suitable, each, for reflect in the direction of the satellite the electromagnetic wave that it receives from the satellite.
- the passive radar reflector of the invention is advantageously visible by all satellites, regardless of the satellite shooting mode. It measures vertical and horizontal deformations along the line of sight of the satellite.
- Figures 1 to 4 already described represent the four different modes of sight of a satellite that are used to measure deformations
- FIGS. 5-7 represent constituent elements of a reflector according to the preferred embodiment of the invention and the reflector obtained by the combination of these constituent elements;
- the reflector according to the preferred embodiment of the invention comprises three planar elements or plates PI, P2, P3.
- Figure 5 shows the plate PI and Figure 6 the plates P2 and P3.
- the plate PI has a rectilinear side al and a side a2 of any shape which delimits a flat angular sector opposite the rectilinear side al.
- Two rectilinear openings in the form of slots f1, f2 are formed in the plate P1 from the same point M located on the side al.
- the slots are at 90 ° to each other and each make an angle of 45 ° with the side al. More generally, however, the angles ⁇ 1, ⁇ 2 that the respective slots f1, f2 with the side a1 are freely between 35 ° and 55 ° (by "freely", it is understood that the slots f1, f2 are then more "linked” by an angle of 90 ° between them).
- the slot fl has a length 11 and the slot f2 has a length 12.
- FIG. 6 shows the plates P2 and P3.
- Each plate P2, P3 has a rectilinear side a3 and a side a4 of any shape which delimits a flat angular sector.
- a rectilinear slot-shaped opening f is formed in each plate P2, P3 from the side a4.
- the axis of the slot f is perpendicular to the rectilinear side a3.
- the distance d1 separating the slot f from the rectilinear side a3 is equal to the length 11 of the slot f1.
- the distance d2 which separates the slot f from the rectilinear side a3 is equal to the length 12 of the slot f2.
- Figure 7 shows the reflector of the invention which results from the assembly of the plates PI, P2 and P3.
- the plates PI and P2 are nested one inside the other, as well as the plates PI and P3.
- the slit f of the plate P2 and the slit fl of the plate P1 are positioned one inside the other, to their end, and aligned and the slot f of the plate P3 and the slot f2 of the plate PI are also positioned one inside the other, to their end, and aligned. It follows from this assembly that the two straight sides a3 of the plates P2 and P3 are in contact with each other and define an edge which constitutes, in combination with the side al, ground holding means of the reflector.
- the reflector of the invention is thus advantageously self-supporting. Placed on the ground, the reflector of the invention thus requires no particular infrastructure. It suffices that the location on the ground whose deformations are to be monitored has an area equivalent to that defined by the sides al, a3. When the reflector is placed on the ground, the plate PI is substantially vertical. So that the reflector is visible from all the satellites, the side al is aligned along the axis of the geographic poles.
- the plates P2 and P3 define a mechanical structure forming two cavities located on either side of the plate PI, each cavity being able to reflect, in the direction of the satellite, the electromagnetic wave that it receives from the satellite.
- a notch e is formed on the edge a3 of each plate P2, P3, substantially in alignment with the slot f, so that, once the reflector mounted, an orifice appears in the lower part of each cavity. It is then advantageously possible, for example, to evacuate the rainwater.
- Figures 8 to 10 show a particular embodiment of the preferred embodiment of the invention.
- the plate PI is rectangular with a long side and a short side, one of the two long sides forming the side a1, and the plates PI and P2 form an isosceles triangle whose base forms the side a3.
- the slots f1 and f2 have the same length 1. They are positioned at 90 ° from each other and at 45 ° each relative to the side al. The distance d between the slot f and the base of the triangle is equal to the length 1 of the slots f 1, f 2.
- the reflector comprises a structure transparent to electromagnetic waves which surrounds the plates PI, P2, P3 in order to protect the plates from environmental aggressions.
- the reflector of the invention has a large number of advantages, namely: it is passive and autonomous and therefore requires no source of electrical energy to power it as is the case for GPS receivers (GPS for "Global Positioning System”), it is maintenance free and can be set up for a follow-up over several years, it is permanent and a path on each measuring point, often difficult to access, is not necessary as is the case with topographic techniques with optical sighting or GPS antenna, it is self- carrier and, as a result, does not require the construction of specific stable pillars as is the case for topographic or GPS techniques,
- the invention has applications in many fields such as, for example, civil engineering and earth sciences.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- General Physics & Mathematics (AREA)
- Aerials With Secondary Devices (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/981,287 US9083084B2 (en) | 2011-01-25 | 2012-01-23 | Passive electromagnetic wave reflector for measuring local strain in a structure on the Earth's surface |
| ES12700705.2T ES2673477T3 (es) | 2011-01-25 | 2012-01-23 | Reflector pasivo de onda electromagnética para medir la deformación local de una estructura en la superficie terrestre |
| EP12700705.2A EP2668699B1 (fr) | 2011-01-25 | 2012-01-23 | Reflecteur passif d'onde electromagnetique pour la mesure de deformation locale de structure a la surface de la terre |
| CA2823820A CA2823820C (fr) | 2011-01-25 | 2012-01-23 | Reflecteur passif d'onde electromagnetique pour la mesure de deformation locale de structure a la surface de la terre |
| JP2013549837A JP6000280B2 (ja) | 2011-01-25 | 2012-01-23 | 地球表面の構造体における局所的な歪み測定のためのパッシブ型電磁波反射体 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1150564 | 2011-01-25 | ||
| FR1150564A FR2970818B1 (fr) | 2011-01-25 | 2011-01-25 | Reflecteur passif d'onde electromagnetique pour la mesure de deformation locale de structure a la surface de la terre |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012101072A1 true WO2012101072A1 (fr) | 2012-08-02 |
Family
ID=45509519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2012/050927 Ceased WO2012101072A1 (fr) | 2011-01-25 | 2012-01-23 | Reflecteur passif d'onde electromagnetique pour la mesure de deformation locale de structure a la surface de la terre |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US9083084B2 (fr) |
| EP (1) | EP2668699B1 (fr) |
| JP (1) | JP6000280B2 (fr) |
| CA (1) | CA2823820C (fr) |
| ES (1) | ES2673477T3 (fr) |
| FR (1) | FR2970818B1 (fr) |
| PT (1) | PT2668699T (fr) |
| WO (1) | WO2012101072A1 (fr) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170302001A1 (en) * | 2016-04-19 | 2017-10-19 | Rosemount Tank Radar Ab | Floating roof target plate |
| CN108519599B (zh) * | 2018-03-26 | 2020-03-27 | 徐州工程学院 | 一种时序sar图像中增加实用ps点的选择方法 |
| AT18073U1 (de) * | 2022-07-26 | 2023-12-15 | Plasser & Theurer Export Von Bahnbaumaschinen Gmbh | Verfahren und System zum Vermessen der Position eines Referenzobjekts, insbesondere eines Festpunkts zum Vermessen eines Gleisstrukturelements und Messanordnung |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3119180A1 (de) * | 1981-05-14 | 1982-12-16 | Walter F. 3200 Hildesheim Röthemeier | "ortungs- und messreflektor" |
| US20030107519A1 (en) * | 2001-12-06 | 2003-06-12 | Snow Jeffrey M. | Apparatus and process for reflecting radar waves |
| CA2425073A1 (fr) * | 2003-04-10 | 2004-10-10 | Japan Aircraft Manufacturing Co., Ltd. | Reflecteur radar |
| FR2948188A1 (fr) * | 2009-07-20 | 2011-01-21 | Soletanche Freyssinet | Procede de surveillance des mouvements d'un terrain |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3324470A (en) * | 1963-10-17 | 1967-06-06 | Western Electric Co | Passive earth satellite reflector |
| GB1467481A (en) * | 1975-04-10 | 1977-03-16 | Stromberg Components Ltd | Radar corner reflectors |
| US4119965A (en) * | 1977-08-08 | 1978-10-10 | Philip Kaszyk | Radar reflector |
| JPH0756502Y2 (ja) * | 1990-11-22 | 1995-12-25 | 株式会社ゼニライトブイ | レーダリフレクタ |
| JPH05152833A (ja) * | 1991-11-27 | 1993-06-18 | Tootex Kk | レーダ用コーナー反射器 |
| JPH09221097A (ja) * | 1996-02-16 | 1997-08-26 | Zeniraito V:Kk | 頭 標 |
| JP2002111370A (ja) * | 2000-09-26 | 2002-04-12 | Japan Aircraft Mfg Co Ltd | レーダー用リフレクタ装置 |
| JP3987451B2 (ja) * | 2003-04-02 | 2007-10-10 | 応用地質株式会社 | 合成開口レーダを用いる地表面変動量計測方法 |
-
2011
- 2011-01-25 FR FR1150564A patent/FR2970818B1/fr not_active Expired - Fee Related
-
2012
- 2012-01-23 US US13/981,287 patent/US9083084B2/en not_active Expired - Fee Related
- 2012-01-23 EP EP12700705.2A patent/EP2668699B1/fr not_active Not-in-force
- 2012-01-23 PT PT127007052T patent/PT2668699T/pt unknown
- 2012-01-23 WO PCT/EP2012/050927 patent/WO2012101072A1/fr not_active Ceased
- 2012-01-23 ES ES12700705.2T patent/ES2673477T3/es active Active
- 2012-01-23 CA CA2823820A patent/CA2823820C/fr not_active Expired - Fee Related
- 2012-01-23 JP JP2013549837A patent/JP6000280B2/ja not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3119180A1 (de) * | 1981-05-14 | 1982-12-16 | Walter F. 3200 Hildesheim Röthemeier | "ortungs- und messreflektor" |
| US20030107519A1 (en) * | 2001-12-06 | 2003-06-12 | Snow Jeffrey M. | Apparatus and process for reflecting radar waves |
| CA2425073A1 (fr) * | 2003-04-10 | 2004-10-10 | Japan Aircraft Manufacturing Co., Ltd. | Reflecteur radar |
| FR2948188A1 (fr) * | 2009-07-20 | 2011-01-21 | Soletanche Freyssinet | Procede de surveillance des mouvements d'un terrain |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2970818B1 (fr) | 2014-01-24 |
| PT2668699T (pt) | 2018-06-25 |
| ES2673477T3 (es) | 2018-06-22 |
| CA2823820C (fr) | 2019-02-12 |
| JP6000280B2 (ja) | 2016-09-28 |
| FR2970818A1 (fr) | 2012-07-27 |
| US20130298689A1 (en) | 2013-11-14 |
| EP2668699B1 (fr) | 2018-03-21 |
| US9083084B2 (en) | 2015-07-14 |
| EP2668699A1 (fr) | 2013-12-04 |
| CA2823820A1 (fr) | 2012-08-02 |
| JP2014509471A (ja) | 2014-04-17 |
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