Satellite calibration and positioning device based on butterfly-shaped corner reflector

Abstract

The utility model discloses a satellite calibration positioning device based on a butterfly-shaped corner reflector, which comprises an observation pillar pre-embedded assembly and a reflector assembly arranged on the observation pillar pre-embedded assembly, and the reflector assembly comprises a horizontal panel detachably arranged on the observation pillar pre-embedded assembly. A plurality of vertical panels perpendicular to the horizontal panel are arranged on the horizontal panel, and at least four dihedral corner reflectors are formed between the plurality of vertical panels and the horizontal panel; one side edges of the plurality of vertical panels are close to the central axis of the horizontal panel, and an antenna connecting rod is detachably connected above the intersection position of the plurality of vertical panels. The satellite calibration and positioning device can form a plurality of dihedral angle reflectors which can be respectively adaptive to the flight direction of a satellite lifting rail and various course angle states under left and right view conditions, and can realize coaxial observation of global satellite navigation system positioning by matching with the arrangement of the antenna connecting rod.

Description

Technical Field

[0001] The utility model relates to the technical fields of satellite navigation and satellite remote sensing, which is the integration of image geodetic technology and GNSS positioning technology, and specifically relates to a satellite calibration and positioning device based on a butterfly corner reflector. Background Art

[0002] In the field of artificial corner reflectors (CRs), research shows that the performance of a dihedral reflector composed of two right-angled surfaces is better than that of a triangular reflector composed of three right-angled surfaces when the lengths of the right-angled sides of their reflecting surfaces are the same. Therefore, the dihedral reflector can achieve greater radar backscattering performance with a smaller panel size.

[0003] The Global Navigation Satellite System (GNSS) and Synthetic Aperture Radar (SAR) interferometry can carry out high-precision surveying and mapping and deformation monitoring services, so they have been widely used in the field of geodesy. Patent ZL201921613782.0 proposes an assembled metal dihedral reflector that supports ascending and descending orbit radar satellites, which can well adapt to the right-looking or left-looking flight directions of radar satellites in ascending and descending orbits, but does not support simultaneous left and right looking observations of satellites, nor the installation of GNSS antennas. Patent ZL202021019638.7 proposes a high-precision calibration and positioning device for radar satellites and GNSS satellites, which adds the ability to adapt to the local incident angle of the radar and a GNSS antenna installation device on the basis of the previous patent. If a satellite calibration and positioning device is to meet the four signal incident conditions of left and right looking in both ascending and descending orbits of a satellite at the same time, the above designs do not meet the requirements.

[0004] In summary, the existing satellite calibration and positioning devices have deficiencies in adaptability when meeting the four signal incident conditions of left and right looking in both ascending and descending orbits of a satellite at the same time, and need to be further improved. Summary of the Invention

[0005] The purpose of the utility model is to provide a satellite calibration and positioning device based on a butterfly corner reflector for the problems existing in the prior art.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A satellite calibration and positioning device based on a butterfly corner reflector, comprising an observation pier embedded component, and a reflector component arranged on the observation pier embedded component. The reflector component includes a horizontal panel detachably installed on the observation pier embedded component, and a plurality of vertical panels perpendicular to the horizontal panel are arranged on the horizontal panel. At least four dihedral angle reflectors are formed between the plurality of vertical panels and the horizontal panel; one side edges of the plurality of vertical panels all approach the central axis of the horizontal panel, and an antenna connecting rod is detachably connected above the intersection position of the plurality of vertical panels.

[0008] By improving the support connection and installation positions of the horizontal panel and the vertical panels, this satellite calibration and positioning device can form a plurality of dihedral angle reflectors, which can respectively adapt to various heading angle states under the flight directions of the satellite ascending and descending orbits and the left and right view conditions. With the arrangement of the antenna connecting rod, coaxial observation for global satellite navigation system positioning can be realized.

[0009] Furthermore, bridging support plates are connected between the vertical panels with an acute angle between adjacent vertical panels. A plurality of the bridging support plates are arranged in parallel, and at least one bridging support plate is connected at a lower position of the vertical panel to connect the horizontal panel and / or the observation pier embedded component.

[0010] The arrangement of the bridging support plates can not only be used to connect and fix the vertical panels and install them on the observation pier embedded component, but also adjust or change the installation orientation of the vertical panels according to the angle size of the bridging support plates so that they can better adapt to the heading angle of the radar satellite ascending and descending orbits.

[0011] Furthermore, the horizontal panel is a circular plate, and a plurality of the vertical panels are installed on the circular plate; or, the horizontal panel is composed of multiple fan-shaped plates, and the vertical panels are arranged on the sides of the fan-shaped plates.

[0012] Specifically, the horizontal panel includes a fan-shaped first panel and a second panel, and the vertical panels include a third panel, a fourth panel, a fifth panel, and a sixth panel. The third panel and the fifth panel are respectively perpendicular to the first panel to form two of the dihedral angle reflectors, and the fourth panel and the sixth panel are respectively perpendicular to the second panel to form two of the dihedral angle reflectors.

[0013] Furthermore, the observation pier embedded component includes a top plate for supporting the reflector component, and a plurality of embedded support feet are arranged below the top plate, which can provide a solid support for the reflector, reduce the sway caused by external factors (such as wind force, vibration, etc.), and thus ensure the accuracy of the observation data.

[0014] In some embodiments, a north-pointing mark is provided above the top plate so that installers can directly adjust the direction of the embedded component according to the scale line.

[0015] In some embodiments, a transition connecting plate is further provided between the top plate and the horizontal panel, and the diameter of the top plate is smaller than the diameters of the transition connecting plate and the horizontal panel.

[0016] Furthermore, one end of the antenna connecting rod is provided with a connecting foot, the connecting foot is connected to the vertical panel, and the other end of the antenna connecting rod is provided with a positioning center coaxial with the central axis.

[0017] Furthermore, the bridging support plate is of a triangular or arc-shaped structure, with multiple angle models, covering at least four different course angles.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows: 1. By improving the support connection and installation positions of the horizontal panel and the vertical panel, the satellite calibration and positioning device of the present utility model can form multiple dihedral reflectors, which can respectively adapt to various course angle states under the satellite ascending and descending orbit flight directions and left and right viewing conditions. With the setting of the antenna connecting rod, coaxial observation for global satellite navigation system positioning can be achieved; 2. The setting of the bridging support plate can not only be used to connect and fix the vertical panel and install it on the embedded component of the observation pier, but also adjust or change the installation orientation of the vertical panel according to the angle size of the bridging support plate so that it can better adapt to the course angle and left and right viewing conditions of the radar satellite ascending and descending orbits; 3. The embedded component of the observation pier can provide a solid support for the reflector, reducing the shaking caused by external factors, thereby ensuring the accuracy of the observation data; 4. The existence of the north-pointing mark facilitates the azimuth calibration step during the installation process, and installers can directly adjust the direction of the embedded component according to the scale line; 5. The position of the GNSS positioning center on the antenna connecting rod is at the intersection of all relevant panels, which helps to make a more accurate relative position reduction of the axis of GNSS positioning and the scattering centers of the four corner reflectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a north-south side view of a satellite calibration and positioning device based on a butterfly corner reflector of the present utility model;

[0020] Figure 2 It is an east-west view of the satellite calibration and positioning device based on a butterfly corner reflector provided by an embodiment of the present application;

[0021] Figure 3 It is a top view of the satellite calibration and positioning device based on a butterfly corner reflector provided by an embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of the bottom of the satellite calibration and positioning device based on a butterfly corner reflector provided by an embodiment of the present application;

[0023] Figure 5 It is a schematic structural diagram of an observation pier embedded component provided by an embodiment of the present application;

[0024] Figure 6 It is a schematic structural diagram of a connecting plate provided by an embodiment of the present application;

[0025] Figure 7 It is a schematic structural diagram of a bridging support plate provided by an embodiment of the present application;

[0026] In the figure: 1. First panel; 2. Second panel; 3. Third panel; 4. Fourth panel; 5. Fifth panel; 6. Sixth panel; 7. Embedded support feet; 8. Bridging support plate; 9. Antenna connecting rod; 10. Top plate; 11. North-pointing mark; 12. Transition connecting plate. Detailed implementation manners

[0027] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] As Figures 1 to 7 shown, a satellite calibration and positioning device based on a butterfly corner reflector includes an observation pier embedded component and a reflector component provided on the observation pier embedded component. The reflector component includes a horizontal panel detachably installed on the observation pier embedded component. A plurality of vertical panels perpendicular to the horizontal panel are provided on the horizontal panel. At least four dihedral angle reflectors are formed between the plurality of vertical panels and the horizontal panel; one side edges of the plurality of vertical panels all approach the central axis of the horizontal panel, and an antenna connecting rod 9 is detachably connected above the intersection position of the plurality of vertical panels.

[0030] By improving the support connection and installation positions of the horizontal panel and the vertical panel, the satellite calibration and positioning device can form multiple dihedral reflectors, which can respectively adapt to various heading angle states under the satellite ascending / descending orbit flight directions and left / right viewing conditions. With the arrangement of the antenna connecting rod, coaxial observation for global satellite navigation system positioning can be realized.

[0031] In some embodiments, the horizontal panel is a circular plate, and multiple vertical panels are installed on the circular plate, and the circular plate is installed on the observation pier embedded component.

[0032] In some embodiments, the horizontal panel can also be multiple sector plates, and the vertical panels are arranged on the side edges of the sector plates, that is, the lower side edges of the vertical panels abut against the side walls of the sector plates, and the vertical panels are directly installed on the observation pier embedded component.

[0033] In this embodiment, the horizontal panel includes a first panel 1 and a second panel 2 of large sectors, and the vertical panels include a third panel 3, a fourth panel 4, a fifth panel 5 and a sixth panel 6. The third panel 3 and the fifth panel 5 are respectively perpendicular to the first panel 1 to form two dihedral reflectors, and the fourth panel 4 and the sixth panel 6 are respectively perpendicular to the second panel 2 to form two dihedral reflectors.

[0034] A butterfly dihedral reflector is formed by these six panels, and four dihedral reflectors can be formed to respectively adapt to four heading angle states under the satellite ascending / descending orbit flight directions and left / right viewing conditions. By installing an antenna connecting rod 9, such as a GNSS antenna connecting rod, at the top of the vertical panel, coaxial observation for high-precision positioning of the GNSS system can be realized.

[0035] The device formed by this fusion method can be used for high-precision ground point positioning and calibration by integrating spaceborne SAR and GNSS. This device can realize high-precision real-time monitoring of the three-dimensional changes of the monitoring points, and at the same time has the dual capabilities of Beidou and SAR satellite remote sensing displacement monitoring, and is especially suitable for four different signal incident directions of the ascending / descending orbits of radar satellites and left / right viewing flight directions.

[0036] Furthermore, bridging support plates 8 are connected between the vertical panels with an acute angle between adjacent vertical panels. There are multiple bridging support plates 8 arranged in parallel, and at least one bridging support plate 8 is connected at a lower position of the vertical panel to connect the horizontal panel and / or the observation pier embedded component.

[0037] In this embodiment, the bridging support plates 8 are respectively arranged between the third panel 3 and the fourth panel 4, and between the fifth panel 5 and the sixth panel 6, with two arranged vertically. The lower bridging support plate 8 can be directly installed on the observation pier embedded assembly.

[0038] The bridging support plates 8 are provided for connecting the vertical panels on one hand. The two panels on both sides are connected to the bridging support plates to form a unit component, which can be directly connected and installed on the observation pier embedded assembly, reducing the difficulty of installing the vertical panels. There is no need for the vertical panels to be connected to the horizontal panels or the observation pier embedded assembly through connectors.

[0039] On the other hand, the installation orientation of the vertical panels can be adjusted or changed according to the angle of the bridging support plates 8 so that it can better adapt to the azimuth angle of the radar satellite's ascending and descending orbits.

[0040] For example, the bridging support plates 8 are of triangular or arc-shaped structures, with multiple angle models, covering at least four different azimuth angles.

[0041] In some examples, there are slight differences in the azimuth angles under the left and right views of the SAR satellite's ascending and descending orbits. To adapt to this difference, the angles of the bridging support plates 8 need to adapt to the four different azimuth angles α, β, μ, ν corresponding to the satellite in four viewing states. The azimuth angles of the ascending and descending orbits corresponding to the north direction are α and β, and the azimuth angles of the ascending and descending orbits corresponding to the south direction are μ and ν.

[0042] Through the design of multiple bridging support plates 8 to meet the azimuth angle distribution under the four satellite viewing angles one by one, the four dihedral angles can be fully adapted to the satellite azimuth angles under the left and right views of the satellite's ascending and descending orbits. By selecting the angles of the bridging support plates 8, the azimuth angles (α, β, μ, ν) of the satellite in four different viewing states can be accurately adapted, so as to ensure accurate reflection signals under different flight directions and viewing conditions. By adjusting the angles of the support plates, the reflection path of the radar signal can be optimized, enabling the dihedral reflector to be adjusted according to the specific flight mode and observation requirements of the satellite.

[0043] The third panel 3 and the first panel 1 form a dihedral reflector, and the sixth panel 6 and the second panel 2 form a dihedral reflector. The two reflectors respectively support the left and right viewing angles of one SAR satellite orbit; the fourth panel 4 and the second panel 2 form a dihedral reflector, and the fifth panel 5 and the first panel 1 form a dihedral reflector. The two reflectors respectively support the left and right viewing angles of another SAR satellite orbit. When the azimuth angle differences between the left and right views of the satellite's ascending and descending orbits are not significant, the two dihedral reflectors on one side have a certain symmetry with the two dihedral reflectors on the other side.

[0044] When the SAR satellite is in orbit, it observes and images the earth's surface by looking left or right. To adapt to this observation method, it is necessary to ensure that the dihedral reflector can accurately reflect the radar wave back to the satellite receiver. Each dihedral reflector consists of two mutually perpendicular panels, which reflect the incident radar wave back to the satellite. By accurately determining the satellite heading angle and then designing the angle of the bridging support plate 8, it is possible to ensure that the radar wave maintains the required path and direction during the reflection process.

[0045] Furthermore, the antenna connecting rod 9 is a GNSS antenna connecting rod. A connecting foot is provided at the lower end of the antenna connecting rod 9, and the connecting foot is connected to the vertical panel. A positioning center coaxial with the central axis is provided at the upper end of the antenna connecting rod 9.

[0046] That is to say, the third panel 3, the fourth panel 4, the fifth panel 5, and the sixth panel 6 intersect at the axis of the antenna connecting rod 9. The positioning center is a GNSS positioning center, and the GNSS positioning center is located at the top of the antenna connecting rod 9 and covers the axis of the antenna connecting rod 9.

[0047] In this embodiment, the position of the GNSS positioning center is at the intersection of all relevant panels, which helps to make a more accurate relative position reduction between the axis of GNSS positioning and the scattering centers of the four corner reflectors.

[0048] In some embodiments of the present application, the scattering center (i.e., the geometric imaging center) of each dihedral reflector is located on the intersection line of the horizontal panel and the vertical panel; when and only when the effective reflection signal of the dihedral reflector conforms to the symmetry law, the geometric imaging center of the dihedral reflector is located at the midpoint position of the intersection line of the horizontal panel and the vertical panel.

[0049] In this embodiment, when the geometric imaging center of the dihedral reflector is located at the midpoint position of the intersection line, the calculation method of the difference value between its imaging axis position and the GNSS positioning position is the simplest.

[0050] Furthermore, the observation pier embedded component includes a top plate 10 for supporting the reflector component, and a plurality of embedded feet 7 are provided below the top plate 10.

[0051] The top plate, as a supporting plane, can directly support the horizontal panel and the bridging support plate through bolts, or an additional transition connecting plate can be added between them.

[0052] The embedded support feet 7 are rod bodies extending downward, and the ends are provided with bending structures, which can provide a solid support for the reflector, reduce the sway caused by external factors (such as wind force, vibration, etc.), and thus ensure the accuracy of the observed data. The design of multiple support feet helps to evenly distribute the weight of the reflector to the cement structure of the observation pier, reduces the pressure on a single support point, and reduces the risk of cracking of the observation pier due to uneven stress.

[0053] In some embodiments, a north-pointing mark 11 is provided above the top plate 10. By presetting a north-direction scale line on the top plate, it is ensured that the embedded components of the observation pier can accurately fit the installation of the horizontal orientation of the corner reflector. The existence of the scale line facilitates the orientation calibration step during the installation process. The installer can directly adjust the direction of the embedded components according to the scale line and use professional equipment such as a compass or a GNSS orientation instrument to achieve high-precision north-pointing orientation work.

[0054] In some embodiments, a transition connecting plate 12 is further provided between the top plate 10 and the horizontal panel, and the diameter of the top plate 10 is smaller than the diameters of the transition connecting plate 12 and the horizontal panel.

[0055] The transition connecting plate 12 has a plurality of screw holes. The connecting plate is respectively connected to the top plate 10 and the horizontal panel through the screw holes and bolts. The upper surface of the transition connecting plate 12 is connected to the first panel 1 and the second panel 2, and the lower surface of the transition connecting plate 12 is connected to the top plate 10. The setting of the screw holes of the connecting plate ensures that the north direction of the butterfly corner reflector installed thereon is completely consistent with the north-pointing direction of the top plate of the embedded components of the observation pier.

[0056] In this embodiment, the transition connecting plate 12 is used to connect the butterfly dihedral angle reflector and the embedded components of the observation pier. Optionally, the transition connecting plate 12 can be respectively connected to the horizontal panel and the top plate 10 through screw holes, or the top plate 10 can be directly connected to the horizontal panel through screw holes, and the transition connecting plate 12 abuts between the two.

[0057] The transition connecting plate 12 can help disperse and evenly distribute the stress transmitted by the horizontal panel to the top plate 10, reduce local stress concentration, so that the area of the top plate 10 is smaller, and it is convenient to make the diameter size of the observation pier smaller. The plurality of screw holes provide precise positioning for different reflector panels, which helps to reduce errors during the installation process and ensure the accurate installation of the embedded components of the observation pier.

[0058] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A satellite calibration and positioning device based on a butterfly corner reflector, comprising an observation pier embedding assembly and a reflector assembly arranged on the observation pier embedding assembly, characterized in that, The reflector assembly includes a horizontal panel detachably mounted on the observation pier embedded assembly, and a plurality of vertical panels perpendicular to the horizontal panel are provided on the horizontal panel. At least four dihedral reflectors are formed between the plurality of vertical panels and the horizontal panel; One side of each of the plurality of vertical panels approaches the central axis of the horizontal panel, and an antenna connecting rod is detachably connected above the intersection position of the plurality of vertical panels.

2. The satellite calibration and positioning device based on a butterfly corner reflector according to claim 1, wherein Bridge support plates are connected between the vertical panels with an acute angle between adjacent vertical panels. The bridge support plates are arranged in parallel and at least one of the bridge support plates is connected at a lower position of the vertical panel to connect the horizontal panel and / or the observation pier embedded assembly.

3. The satellite calibration and positioning device based on a butterfly corner reflector according to claim 1, characterized in that The horizontal panel is a circular plate, and the plurality of vertical panels are mounted on the circular plate; alternatively, the horizontal panel is composed of multiple fan-shaped plates, and the vertical panels are arranged on the sides of the fan-shaped plates.

4. The satellite calibration and positioning device based on a butterfly corner reflector according to claim 1 or 3, characterized in that The horizontal panel includes a first panel and a second panel in the shape of a sector. The vertical panels include a third panel, a fourth panel, a fifth panel, and a sixth panel. The third panel and the fifth panel are respectively perpendicular to the first panel to form two of the dihedral reflectors, and the fourth panel and the sixth panel are respectively perpendicular to the second panel to form two of the dihedral reflectors.

5. The satellite calibration and positioning device based on a butterfly corner reflector according to claim 1, wherein The observation pier embedded assembly includes a top plate for supporting the reflector assembly, and a plurality of embedded support feet are provided below the top plate.

6. The satellite calibration and positioning device based on a butterfly corner reflector according to claim 5, characterized in that A north-pointing mark is provided above the top plate.

7. The satellite calibration and positioning device based on a butterfly corner reflector according to claim 5, characterized in that, A transition connecting plate is further provided between the top plate and the horizontal panel, and the diameter of the top plate is smaller than the diameters of the transition connecting plate and the horizontal panel.

8. The satellite calibration and positioning device based on a butterfly corner reflector according to claim 1, wherein One end of the antenna connecting rod is provided with a connecting foot, and the connecting foot connects the vertical panel. The other end of the antenna connecting rod is provided with a positioning center coaxial with the central axis.

9. The satellite calibration and positioning device based on a butterfly corner reflector according to claim 2, characterized in that, The bridge support plate is in a triangular or arc-shaped structure and has multiple angle models, covering at least four different course angles.

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