CN210803712U - Assembled metal dihedral corner reflector supporting lifting orbit radar satellite - Google Patents
Assembled metal dihedral corner reflector supporting lifting orbit radar satellite Download PDFInfo
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- CN210803712U CN210803712U CN201921613782.0U CN201921613782U CN210803712U CN 210803712 U CN210803712 U CN 210803712U CN 201921613782 U CN201921613782 U CN 201921613782U CN 210803712 U CN210803712 U CN 210803712U
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Abstract
The utility model discloses an assembled metal dihedral corner reflector supporting a lifting orbit radar satellite, which comprises a corner reflector body used for reflecting radar satellite signals, a base arranged on an observation pier and used for mounting the corner reflector body, and an assembled connector; the corner reflector body comprises a first panel and a second panel which are vertical to each other, a third panel and a fourth panel which are vertical to each other, and the four panels form two symmetrical vertical two-plane corner panel structures; wherein, second panel and fourth panel level are fixed in the upper surface of base, two perpendicular two-sided corner plate structures are connected to the modular connector. The utility model has the advantages that: the corner reflector of the utility model supports the lifting orbit mode, shortens the satellite revisit period and can realize rapid monitoring; the corner reflector is of a split structure and is formed by detachably connecting a plurality of structures, and the structure is convenient to assemble and disassemble, so that field transportation of equipment, repeated utilization of the equipment and replacement and installation of parts are facilitated.
Description
Technical Field
The utility model relates to a radar satellite remote sensing scattering intensity calibration and deformation monitoring technology field, concretely relates to assembled metal dihedral corner reflector who supports lift rail radar satellite.
Background
Since the first synthetic aperture radar satellite SEASAT launched in 1978, the radar satellite remote sensing technology is gradually mature, and forms the current main technical means for earth observation together with optical remote sensing. The radar satellite adopts an active microwave remote sensing mode, is not influenced by factors such as cloud and fog, sunshine and the like, and has the advantages of all-day and all-day image acquisition and earth surface change sensing. ERS-1 satellite emitted by the European and air Bureau in 1992 firstly reveals the deformation field of the same earthquake of Landers in the United states, and then the radar interferometry technology is widely applied to the field of deformation field measurement of earthquake, volcano, glacier, landslide and the like at present.
The Synthetic Aperture Radar (SAR) technology is to improve the Radar resolution in the distance direction by the distance direction pulse compression technology and to improve the resolution in the direction by simulating a large antenna system by the SAR technology, thereby greatly improving the image resolution of the real Aperture Radar. The Synthetic Aperture Radar interferometry (Interferometric Synthetic Aperture Radar) technique refers to a method in which a Radar satellite acquires two SAR images of the same area in the same orbit and the same shooting mode, and the two SAR images are registered by using a precise registration technique to acquire an interference phase image. Then, after phase unwrapping, the elevation of the terrain (DEM) can be obtained from the interference fringes. The differential interferometric radar measurement technique (D-InSAR) is a measurement technique for removing the phase contribution of topographic information (DEM) from an interference image to obtain the micro deformations of the earth's surface. The topographic relief can adopt the currently free SRTM-DEM (global digital earth elevation acquired by American space shuttle) and can also adopt the high-precision DEM acquired by an interferometric technique. Compared with other traditional measurement technologies, the D-InSAR technology has the coverage advantages of wide area and space continuity, and is a space-to-ground monitoring technology with great development potential.
The artificial corner reflector is generally used for calibration of radar satellites, high-precision positioning of images, geocoding and the like, and is currently a triangular reflector. The general structure of the triangular reflector is a regular triangular pyramid with three side surfaces which are right-angled triangles and are mutually vertical; the arrangement of the type of corner reflector needs to consider that the horizontal azimuth angle of the type of corner reflector is consistent with the flight direction of the radar satellite, and a certain elevation angle is adopted to enable the central axis of the reflector to be consistent with the side view angle of the radar satellite, so that the installation difficulty and the structural complexity of the type of corner reflector are high. In addition, in landslide disaster monitoring areas and other large-scale infrastructure such as large dams, highway high-speed railway subgrades, river banks and other monitoring areas, artificial corner reflectors which are high in deformation monitoring precision, simple in structure, low in cost, convenient to install and small in size as far as possible need to be arranged. Therefore, there is a need to develop new artificial corner reflectors for high-precision monitoring of important targets.
Disclosure of Invention
An object of the utility model is to prior art not enough, provide a deformation monitoring precision height and simple to operate's assembled metal dihedral corner reflector of supporting lift rail radar satellite.
The utility model adopts the technical proposal that: an assembled metal dihedral corner reflector supporting a lifting orbit radar satellite is characterized by comprising a corner reflector body for reflecting radar satellite signals, a base for mounting the corner reflector body and an assembled connector; the corner reflector body comprises a first panel and a second panel which are vertical to each other, a third panel and a fourth panel which are vertical to each other, and the four panels form two symmetrical vertical two-plane corner panel structures; wherein, second panel and fourth panel level are fixed in the upper surface of base, two perpendicular two-sided corner plate structures are connected to the modular connector.
According to the scheme, the projection of the first panel on the horizontal plane is consistent with the flight direction of the orbit rising radar satellite, and the projection of the third panel on the horizontal plane is consistent with the flight direction of the orbit falling radar satellite.
According to the scheme, the assembly type connector comprises a triangular support frame and a plurality of L-shaped connecting rods, the triangular support frame comprises a first rod piece which is attached and fixed with the back side of the first panel and a second rod piece which is attached and fixed with the north side of the third panel, and the end parts of the first rod piece and the second rod piece are fixedly connected to form a vertex angle of the triangular support frame; the L-shaped connecting rods are arranged at intervals along the length direction of the first rod piece and the second rod piece, the vertical sections of the L-shaped connecting rods are fixedly attached to the back side of the first panel/the third panel, and the horizontal sections of the L-shaped connecting rods are fixedly attached to the bottom surface of the second panel/the fourth panel.
According to the scheme, the triangular support frame further comprises a third rod piece connected with the first rod piece and the second rod piece.
According to the scheme, the base comprises an upper layer frame and a lower layer frame which are formed by enclosing angle steel, and a plurality of steel columns for connecting the upper layer frame and the lower layer frame; the upper layer frame is connected with the second panel/the fourth panel; and the lower layer frame is fixed with the surface of the observation pier or the horizontal ground.
According to the scheme, the first panel, the second panel, the third panel and the fourth panel are all semicircular panels, the first panel is connected with the chord side edge of the second panel, and the third panel is connected with the chord side edge of the fourth panel.
According to the scheme, the first panel, the second panel, the third panel and the fourth panel are all rectangular panels.
According to the scheme, the corner reflector body is made of a metal plate.
The utility model has the advantages that:
1. the corner reflector of the utility model comprises a vertical dihedral corner plate structure, which supports a lifting rail mode, shortens the satellite revisiting period and can realize rapid monitoring; the vertical dihedral angle reflection mode supports radar irradiation with multiple incident angles, enhances the usability of the corner reflector to different radar satellite incident angles, can be used for InSAR deformation monitoring with high precision on the surface of a landslide, and can also be used for traditional leveling or GPS settlement monitoring substitution means in large-scale infrastructure such as dams, expressways or high-speed railway beds, river banks and dikes.
2. Corner reflector is split type structure, is formed by a plurality of structure releasable connection, and convenient equipment of this kind of structure is favorable to field transportation, the equipment reuse of equipment to and the change and the installation etc. of spare part, solved that the equipment size that exists among the prior art is big, be difficult to transportation and installation scheduling problem, improved the installation effectiveness of whole equipment, reduced equipment operation and maintenance cost, manual work intensity is synchronous low.
3. The utility model relates to a subassembly formula connector, its apex angle of the triangular support frame of subassembly formula connector can be adjusted according to radar satellite orbit to satisfy the accurate adjustment of satellite lifting orbit azimuth under the condition of different latitude areas and different radar satellites, the commonality is strong; the L-shaped connecting rod can be used for vertically connecting and assembling two vertical panels, so that high-precision vertical assembly is realized.
4. The base of the utility model comprises three independent structural components, which is convenient for batch production and installation; the angle steel is connected with the panel through bolts, so that the vertical two-surface angle plate can keep good stability.
Drawings
Fig. 1 is a general schematic diagram of an embodiment of the present invention.
Fig. 2 is an overall schematic diagram of the second embodiment.
Fig. 3 is a schematic view of a corner reflector body (four panels are semicircular panels).
Fig. 4 is a schematic diagram of the modular connector of the present embodiment.
Fig. 5 is a schematic view of the tripod.
FIG. 6 is a schematic view of an L-shaped link.
Fig. 7 is a schematic view of the base in this embodiment.
Fig. 8 is a second schematic view of the corner reflector body (four panels are all rectangular panels).
Fig. 9 is a schematic diagram illustrating the principle of selecting angles of the triangular support frame under the radar right-view adjustment.
Fig. 10 is a schematic diagram of an angle selection principle of the triangular support frame under radar left-view adjustment.
FIG. 11 is a schematic diagram of an angle between a declination and a true north direction.
Wherein: 1. a first panel; 2. a second panel; 3. a third panel; 4. a fourth panel; 5. a triangular support frame; 6. an L-shaped connecting rod; 7. an upper frame; 8. a lower layer frame; 9. a steel column; 10. the flight direction of the orbit rising radar satellite; 11. and the flight direction of the orbit-descending radar satellite.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
An assembled metal dihedral corner reflector supporting a lifting orbit radar satellite as shown in fig. 1 and 2 comprises a corner reflector body for reflecting radar satellite signals, a base for mounting the corner reflector body, and an assembled connector; as shown in fig. 3, the corner reflector body comprises a first panel 1 and a second panel 2 which are perpendicular to each other, and a third panel 3 and a fourth panel 4 which are perpendicular to each other, wherein the four panels form two symmetrical vertical dihedral corner panel structures; wherein the second panel 2 and the fourth panel 4 are horizontally fixed to the upper surface of the base (the second panel 2 and the fourth panel 4 are coplanar), and the modular connector connects two vertical dihedral corner plate structures. The utility model discloses in, projection and the lift rail radar satellite direction of flight 10 of first panel 1 on the horizontal plane are unanimous, and projection and the lift rail radar satellite direction of flight 11 of third panel 3 on the horizontal plane are unanimous.
Preferably, as shown in fig. 4 to 6, the modular connector includes a triangular support frame 5 and a plurality of L-shaped connecting rods 6, the triangular support frame 5 includes a first rod piece (which can be fixed by screw or bolt connection) attached and fixed to the back side of the first panel 1, and a second rod piece (which can be fixed by screw or bolt connection) attached and fixed to the north side of the third panel 3, and the ends of the first rod piece and the second rod piece are fixedly connected to form a vertex angle of the triangular support frame 5; l type connecting rod 6 sets up along the length direction interval of first member and second member, and L type connecting rod 6's vertical section is fixed with the dorsal part laminating of first panel 1/third panel 3, and L type connecting rod 6's horizontal segment is fixed with the bottom surface laminating of second panel 2/fourth panel 4. The utility model discloses in, the length direction of its first member of triangular supports frame 5 and the orbit direction looks adaptation of rising rail radar satellite, the length direction of second member and the orbit direction looks adaptation of falling rail radar satellite. In order to improve the overall stability of the connecting frame, the triangular support frame 5 further comprises a third rod piece connecting the first rod piece and the second rod piece. In this embodiment, the L-shaped connecting rods 6 have four sets, and two sets are respectively disposed on the first rod and the second rod.
Preferably, as shown in fig. 7, the base includes an upper frame 7 and a lower frame 8 enclosed by angle steel, and a plurality of steel columns 9 (which may be connected by bolts) for connecting the upper frame 7 and the lower frame 8; the upper-layer frame 7 is connected with the second panel 2/the fourth panel 4 through bolts (specifically connected with angle steel forming the upper-layer frame 7); the lower layer frame 8 is fixed with the surface of an observation pier (which can be a cement observation pier) or the horizontal ground through expansion bolts. In this embodiment, the steel columns 9 are circular steel columns, and four steel columns are provided and are respectively arranged at four corners of the upper and lower frames 8.
Preferably, the first panel 1, the second panel 2, the third panel 3 and the fourth panel 4 are all semicircular panels, as shown in fig. 3, the first panel 1 is connected with the second panel 2 at the chord side, and the third panel 3 is connected with the fourth panel 4 at the chord side.
Preferably, the first panel 1, the second panel 2, the third panel 3 and the fourth panel 4 are all rectangular panels, as shown in fig. 8.
Preferably, the corner reflector body is manufactured from a metal plate.
In the utility model, in order to make the corner reflector obtain the maximum reflection strength, the azimuth angle of two vertical dihedral angle plate structure installation is required to be consistent with the flight direction of the lifting rail radar, and the effective reflection of the lifting rail radar satellite signal is realized by utilizing the characteristic of strong reflection of vertical dihedral angle metal plates to the aperture radar signal; the projection of the first panel 1 on the horizontal plane is consistent with the flight direction 10 of the orbit rising radar satellite, and the projection of the third panel 3 on the horizontal plane is consistent with the flight direction 11 of the orbit falling radar satellite. The apex angle of the triangular support frame 5 of the assembly type connector can be adjusted according to the radar satellite orbit so as to meet the requirement of accurate adjustment of the satellite lifting orbit azimuth angle under the conditions of different latitude areas and different radar satellites, the universality is strong, the L-shaped connecting rod 6 can be used for vertically connecting and assembling two vertical panels with high precision, and high-precision vertical assembly is realized.
The utility model discloses a corner reflector's assembly method does:
firstly, two horizontally symmetrical vertical dihedral corner plate structures are assembled respectively: the second panel 2 and the fourth panel 4 are horizontally placed, the first panel 1 and the third panel 3 are vertical, the first panel 1 and the second panel 2 are connected by an L-shaped rod piece of the assembled connector to form a group of vertical dihedral angle plate structures, the third panel 3 and the fourth panel 4 are connected by the L-shaped rod piece to form another group of vertical dihedral angle plate structures, and the L-shaped connecting rod 6 is respectively connected with each panel through bolts or screws;
secondly, through two perpendicular dihedral corner plate structures of assembled connector symmetric connection: the first panel 1 and the third panel 3 are connected by a triangular support frame 5, and the angle of the two panels in the horizontal projection direction is consistent with the included angle of the flight direction of the lifting orbit satellite; by using
Thirdly, mounting a base: each steel column 9 is connected to the upper frame 7 and the lower frame 8 by bolts.
And finally, connecting the vertical dihedral corner plate structure and the base through bolts.
The utility model discloses a corner reflector's mounting method does: acquiring a radar satellite lifting orbit azimuth angle of an angle reflector mounting area through an approximate formula or a satellite company, and determining a vertex angle of the triangular support frame 5; and then, inquiring to obtain the geomagnetic declination of the installation area of the corner reflector, and determining the true north direction of the horizontal disc surface of the corner reflector through a high-precision geological compass to realize accurate and efficient installation.
The utility model discloses in, its first member of triangular supports frame 5 and second member end connection constitute the apex angle, and the apex angle is the flight orbit of rising rail radar satellite and the contained angle α of true north direction1(i.e. the included angle between the projection of the third panel 3 on the horizontal ground and the true north direction), and the included angle α between the flight orbit of the off-orbit radar satellite and the true north direction2(i.e. the angle between the projection of the first panel 1 on a level ground and the true north). Because the orbit direction of the radar satellite on the ground changes along with the difference of the latitude of the earth, the method can be calculated by using the formula 1:
in the formula, α1，α2The method comprises the steps of obtaining a lifting orbit azimuth angle of an area by a parameter file provided by an SAR satellite company, wherein the lifting orbit azimuth angle is an approximate angle between a satellite subsatellite point track direction and a true north direction, theta is an included angle between a flight direction and an equatorial plane when a satellite passes through an equator, β is a latitude of an installation position of a corner reflector, when the above formula is adopted for approximate calculation, the value range of β is 0-60 degrees, and when the latitude is higher than 60 degrees, the formula (1) is not available.
The method for setting the true north direction of the corner reflector by using the high-precision geological compass comprises the following steps: and (4) determining the installation direction of the corner reflector by pointing north on the cement observation pier through a geological compass. If the radar satellite lifting orbit data are all right-view imaging, the installation angles of the corner reflectors are shown in fig. 9 (if the radar satellite lifting orbit data are all left-view imaging, the installation angles of the corner reflectors are shown in fig. 10). The magnetic north direction is obtained through the geological compass, the local magnetic declination correction number is consulted, and the correct true north direction is obtained by correcting as shown in figure 11. And (3) fixing the square angle steel upper base 15 of the corner reflector to the cement observation pier by using the expansion bolt based on the true north direction. The method is also suitable for the imaging mode of the satellite orbit radar with the same southern hemisphere.
The utility model discloses the actual installation precision in horizontal position can reach about positive negative 1 degree, satisfies the demand that high accuracy deformation was surveyd.
Although the terms panel, tripod 5, L-shaped link 6, base, steel column, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
It should be noted that the above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that the technical solutions described in the foregoing embodiments can be modified or some technical features can be replaced with equivalents, but any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. An assembled metal dihedral corner reflector supporting a lifting orbit radar satellite is characterized by comprising a corner reflector body for reflecting radar satellite signals, a base for mounting the corner reflector body and an assembled connector; the corner reflector body comprises a first panel and a second panel which are vertical to each other, a third panel and a fourth panel which are vertical to each other, and the four panels form two symmetrical vertical two-plane corner panel structures; wherein, second panel and fourth panel level are fixed in the upper surface of base, two perpendicular two-sided corner plate structures are connected to the modular connector.
2. The assembled metal dihedral corner reflector supporting a raised and lowered radar satellite as claimed in claim 1, wherein the projection of the first panel on the horizontal plane coincides with the flight direction of the raised and lowered radar satellites, and the projection of the third panel on the horizontal plane coincides with the flight direction of the lowered and raised radar satellites.
3. The assembled metal dihedral corner reflector supporting a raised-and-lowered rail radar satellite as claimed in claim 1, wherein the assembly connector comprises a triangular support frame and a plurality of L-shaped connecting rods, the triangular support frame comprises a first rod attached and fixed to the back side of the first panel and a second rod attached and fixed to the north side of the third panel, and the first rod is fixedly connected to the end of the second rod to form a vertex angle of the triangular support frame; the L-shaped connecting rods are arranged at intervals along the length direction of the first rod piece and the second rod piece, the vertical sections of the L-shaped connecting rods are fixedly attached to the back side of the first panel/the third panel, and the horizontal sections of the L-shaped connecting rods are fixedly attached to the bottom surface of the second panel/the fourth panel.
4. The assembled metal dihedral corner reflector supporting a raised-orbit radar satellite as claimed in claim 3, wherein the triangular support further comprises a third bar connecting the first bar and the second bar.
5. The assembled metal dihedral corner reflector supporting a raised-and-lowered radar satellite as claimed in claim 1, wherein the base includes upper and lower frames surrounded by angle steel, and a plurality of steel columns for connecting the upper and lower frames; the upper layer frame is connected with the second panel/the fourth panel; and the lower layer frame is fixed with the surface of the observation pier or the horizontal ground.
6. The fabricated metal dihedral corner reflector supporting a raised-orbit radar satellite as claimed in claim 1, wherein the first, second, third and fourth panels are semicircular panels, the first panel being connected to the second panel at a chordal side and the third panel being connected to the fourth panel at a chordal side.
7. The assembled metal dihedral corner reflector supporting a raised-orbit radar satellite of claim 1, wherein the first, second, third and fourth panels are rectangular panels.
8. The assembled metal dihedral corner reflector supporting a raised rail radar satellite as claimed in claim 1, wherein the corner reflector body is made of a metal plate.
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| CN201921613782.0U CN210803712U (en) | 2019-09-25 | 2019-09-25 | Assembled metal dihedral corner reflector supporting lifting orbit radar satellite |
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| CN201921613782.0U CN210803712U (en) | 2019-09-25 | 2019-09-25 | Assembled metal dihedral corner reflector supporting lifting orbit radar satellite |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531356A (en) * | 2019-09-25 | 2019-12-03 | 武汉大学 | A kind of assembled metal Dihedral Corner Reflectors for supporting lift rail radar satellite |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531356A (en) * | 2019-09-25 | 2019-12-03 | 武汉大学 | A kind of assembled metal Dihedral Corner Reflectors for supporting lift rail radar satellite |
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