CN109901118B - Artificial corner reflector for synthetic aperture radar interferometry calibration - Google Patents
Artificial corner reflector for synthetic aperture radar interferometry calibration Download PDFInfo
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- CN109901118B CN109901118B CN201910233462.0A CN201910233462A CN109901118B CN 109901118 B CN109901118 B CN 109901118B CN 201910233462 A CN201910233462 A CN 201910233462A CN 109901118 B CN109901118 B CN 109901118B
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Abstract
The invention relates to an artificial corner reflector for the interferometric calibration of a synthetic aperture radar, which comprises a corner reflector and a base adjusting device, wherein the base adjusting device is arranged on the corner reflector; the base adjusting device is connected with the corner reflector and is configured for carrying out multidirectional adjustment on the corner reflector; the corner reflector is of a triangular pyramid structure with a folding hinge device, and the whole corner reflector is folded into a triangular plane through the hinge device after observation is finished; the base adjusting device comprises a warp angle adjusting device, a weft angle adjusting device, a pitching angle adjusting device and a tripod; the tripod is a steel tripod and is used as a part connected with the ground; the calibration device is suitable for calibration work of ground surface deformation monitoring of ground subsidence, ground cracks and the like in a plain area, has the characteristics of detachability, water accumulation prevention, high precision, convenience in adjustment, high reliability and the like, and lays a foundation for subsequent calibration and ground surface micro-deformation monitoring work.
Description
Technical Field
the invention relates to the technical field of measurement and monitoring, in particular to an artificial corner reflector for synthetic aperture radar interferometry calibration.
Background
A Synthetic Aperture Radar (SAR) is an imaging radar with a high resolution, which is capable of obtaining a two-dimensional and three-dimensional radar image with a relatively high resolution under poor conditions of a natural environment and a meteorological environment. To produce a radar image, it is necessary to send successive radio pulses to detect the target scene and then receive echoes of each pulse signal, the successively recorded radar echo signal processing allowing combined recording from these multiple antenna positions, the process forming a synthetic antenna aperture and allowing the creation of higher resolution images than a given physical antenna. The synthetic aperture radar has the characteristics of realizing all-day and all-weather ground observation without the limitation of illumination, weather conditions and the like, and can effectively identify camouflage and penetration covering objects, so that the synthetic aperture radar has been successfully applied to the aspects of ground settlement monitoring, geological disaster monitoring and the like, and has a good application effect.
The interference radar is a synthetic aperture radar adopting an interference measurement technology, also called a dual-antenna SAR or a coherent SAR, which is a product of the fusion of the traditional synthetic aperture radar technology and a radio astronomical interference technology, and transmits microwaves to a target area by utilizing the radar, then receives reflected echoes of a target ground object so as to obtain a synthetic aperture radar complex image pair imaged by the target area, if a coherent condition exists between the complex image pair, the synthetic aperture radar complex image pair is subjected to conjugate multiplication to obtain an interference diagram, and according to a phase value of the interference diagram, a path difference of the microwaves in two imaging processes is obtained, so that the terrain, the landform and the micro-change of the surface of the target area are calculated, and the interference radar can be used for the aspects of digital elevation model establishment, crust deformation detection, ground settlement monitoring, sudden geological disaster monitoring and the like.
In order to comprehensively ensure the monitoring precision of the synthetic aperture radar on a target ground object and realize effective measurement on the small deformation of the ground surface, the synthetic aperture radar needs to be calibrated, otherwise, the monitoring precision cannot be determined. Currently, calibration is mainly realized by arranging a standard reference calibrator in a selected calibration field to provide a radar cross-sectional area reference value. The corner reflector is the most convenient, important and accurate standard reference calibrator, and the accuracy and stability of the radar cross section greatly influence the calibration accuracy, so that the establishment of a reasonable, convenient, efficient and high-accuracy artificial corner reflector is expected to improve the monitoring accuracy.
the size, the structure, the shape and the installation mode of the artificial corner reflector can be artificially controlled in the calibration area, so that stable and clear amplitude information is displayed in a synthetic aperture radar image, the potential of monitoring surface micro-deformation by an InSAR technology in a low-coherence area can be realized, and the artificial corner reflector is widely applied and developed in recent years. The artificial corner reflector is arranged in a calibration area, radar incident light irradiates on a plurality of surfaces which are vertical to each other of the corner reflector, after a plurality of reflections, the incident light reflects back along the incoming direction of a path, bright spots in the shape of cross hairs and the like are formed on an image, and the size and the brightness of the bright spots are one or a plurality of resolution units. At present, many synthetic aperture radar interferometry units begin to use artificial corner reflectors to measure urban ground settlement, major linear engineering micro-change, landslide deformation and the like, and have wide application prospects.
However, the artificial corner reflector in the prior art has many problems in the aspects of ground settlement and sudden geological disaster monitoring. Firstly, in the manual corner reflector in the prior art, the lower angle adjusting device adopts a gear type adjusting valve, so that the angle of the manual corner reflector is extremely complex to adjust, the accuracy of the angle adjustment cannot be guaranteed, long time is needed for measurement and manual calibration when the angle is adjusted every time, and time and labor are consumed for adjusting the pitch angle of different satellites; secondly, because the traditional corner reflector made of aluminum skin, aluminum honeycomb and aluminum alloy is not ideal for radar reflection, the stability of the corner reflector has a certain problem, and after the corner reflector is subjected to wind and rain, the reflection performance of the aluminum material caused by weathering is greatly weakened, which also influences the reflectivity; thirdly, the existing artificial corner reflector adopts a totally-enclosed structure, so that water is easy to accumulate in summer, and the accuracy of the reflector is greatly influenced by the accumulated water; finally, the currently used corner reflectors are all fixed devices, and once the corner reflectors are installed, the corner reflectors cannot be moved, and cannot be moved and adjusted if the local environment changes, so that the corner reflectors are not portable, and the feasibility of moving and calibrating different areas cannot be met.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an artificial corner reflector for the interferometry calibration of a synthetic aperture radar, which can solve the problems that the calibration angle of the corner reflector is difficult to adjust, the precision is low, the portability is low, the corner reflector is difficult to clean, the material of the reflecting surface is not good and the like in the interferometry process of the synthetic aperture radar; the artificial corner reflector for the interferometry calibration of the synthetic aperture radar is suitable for the detachability, water accumulation prevention, high precision, convenient adjustment and high reliability of ground settlement monitoring in a plain area, and lays a foundation for the subsequent calibration and ground surface micro-deformation monitoring work.
The technical scheme of the invention is as follows:
An artificial corner reflector for synthetic aperture radar interferometry calibration, comprising a corner reflector and a base adjustment device; the base adjusting device is connected with the corner reflector; the corner reflector is provided with folding hinge devices, and the whole corner reflector is folded into a triangular plane through each hinge device after observation is finished; the corner reflector includes a first plate, a second plate, and a third plate. Every two flat plates are mutually perpendicular to form a triangular pyramid structure, and are light reflecting plates, and the top ends of the first plate and the second plate are fixed through buckles when the light reflecting plates are unfolded; the buckle is detachable rubber triangular pyramid device for the top of corner reflector is fixed when opening, prevents the branching.
Preferably, the first plate and the second plate are flat plates on the left and right sides of the upper part of the corner reflector, wherein each plate is used as a reflecting surface, the first plate comprises a first plate first part and a first plate second part, the first plate first part and the first plate second part are of symmetrical structures, and a first hinge device is arranged between the first plate first part and the first plate second part; the second plate comprises a second plate first part and a second plate second part, the second plate first part and the second plate second part are of symmetrical structures, and a second hinge device is arranged between the second plate first part and the second plate second part;
The first hinge device comprises a first part and a second part, the first part of the first hinge device is rotatably connected with the second part of the first hinge device, the first part of the first hinge device is connected with the first part of the first plate, the second part of the first hinge device is connected with the second part of the first plate, and the first hinge device is arranged on the outer side wall of the first plate;
the second hinge device comprises a first part and a second part, the first part of the second hinge device is rotatably connected with the second part of the second hinge device, the first part of the second hinge device is connected with the first part of the second plate, the second part of the second hinge device is connected with the second part of the second plate, and the second hinge device is arranged on the outer side wall of the second plate;
A third hinge device is arranged between the first plate and the third plate, and a fourth hinge device is arranged between the second plate and the third plate;
The third hinge device comprises a first part and a second part, the second part of the first plate is connected with the third plate through the third hinge device, the first part of the third hinge device is connected with the second part of the first plate, the second part of the third hinge device is connected with the third plate, the first part of the third hinge device is rotatably connected with the second part of the third hinge device, and the first part of the third hinge device is positioned on the inner side wall of the first plate.
The fourth hinge device comprises a first part and a second part, the second part of the second plate is connected with the third plate through the fourth hinge device, the first part of the fourth hinge device is connected with the second part of the second plate, the second part of the fourth hinge device is connected with the third plate, the first part of the fourth hinge device is rotatably connected with the second part of the fourth hinge device, and the first part of the fourth hinge device is positioned on the inner side wall of the second plate.
Preferably, the first plate, the second plate and the third plate are all of a three-layer structure, and comprise a back plate, a silver plating layer and a gold-plated matrix grid layer; the back plates of the first plate, the second plate and the third plate are all thin-layer carbon fiber plates; the back plates are all provided with silver coatings, and a gold-plated matrix grid layer is arranged on the silver coatings.
Preferably, a drain hole is provided at a junction of the rear end of the third plate with the first plate and the second plate.
Preferably, the gold-plated matrix grid is a square grid, the thickness of the thin-layer carbon fiber plate is 0.6mm, the diameter of the square grid in the gold-plated matrix grid layer is 2mm, and the distance between squares is 2 mm.
Preferably, the edge of each reflector is provided with a non-reflective rubber strip for realizing clear division with surrounding ground objects.
Preferably, the base adjusting device comprises a warp angle adjusting device, a weft angle adjusting device, a pitch angle adjusting device and a tripod, and the warp angle adjusting device, the weft angle adjusting device and the pitch angle adjusting device are arranged at the upper part of the tripod; the warp angle adjusting device is fixedly connected with the weft angle adjusting device, the weft angle adjusting device is fixedly connected with the pitching angle adjusting device, the pitching angle adjusting device is connected with the tripod, and the corner reflector is fixed on the upper portion of a warp angle adjusting shaft in the warp angle adjusting device.
preferably, the warp-wise angle adjusting device comprises a warp-wise angle adjusting shaft, a warp-wise angle adjusting handle, a warp-wise angle adjusting sleeve, a sleeve built-in baffle and a warp-wise angle adjusting fixing screw. The radial angle adjusting sleeve is internally provided with sleeve built-in baffles which are arranged in a pair in the sleeve, the radial angle adjusting shaft penetrates through the sleeve, and the diameter of a shaft section of the radial angle adjusting shaft between the two groups of baffles is larger than that of other parts of the radial angle adjusting shaft; warp direction angle adjustment sleeve is provided with the screw hole, and warp direction angle adjustment fixed screw installs to this screw hole, and warp direction angle adjustment handle is connected with warp direction angle adjustment axle, and warp direction angle adjustment axle carries out the rotation of arbitrary angle in warp direction angle adjustment sleeve through angle adjustment handle's rotation, adjusts the completion back, fixes through warp direction angle adjustment fixed screw.
Preferably, the meridional angle adjusting device further comprises a meridional angle adjusting dial and a meridional angle adjusting pointer; the warp-wise angle adjusting pointer is connected with the warp-wise angle adjusting shaft, and the warp-wise angle adjusting dial is fixed on the sleeve.
Preferably, the latitudinal angle adjusting sleeve is connected with the pitch angle adjusting device in a welding mode, and the exterior of the latitudinal angle adjusting sleeve can be adjusted by an angle of 0-360 degrees; the warp-wise angle adjusting sleeve is connected with the weft-wise angle adjusting device in a welding mode, and the outer part of the warp-wise angle adjusting sleeve can be adjusted by 0-360 degrees; the angle of the pitch angle adjusting device is determined by adjusting the included angle between the latitudinal angle adjusting sleeve and the tripod, and the adjusting range of the angle is 0-180 degrees.
Compared with the prior art, the artificial corner reflector for the interferometry calibration of the synthetic aperture radar enables the optimized equipment to be more convenient and accurate to serve the interferometry work of the synthetic aperture radar through the optimized design of the existing fixed corner reflector, can better serve the ground surface micro-change measurement of ground settlement, ground cracks, sudden geological disasters and major linear engineering, provides guarantee for urban planning and construction, is suitable for the detachable, water accumulation prevention, high precision, convenient adjustment and high reliability artificial corner reflector for the ground settlement monitoring of a plain area, can greatly reduce the satellite angle adjusting time, has stronger portability, and is suitable for the geological fields of ground settlement, ground crack monitoring and the like. Specifically, the artificial corner reflector for the interferometric calibration of the synthetic aperture radar has the following advantages:
(1) The artificial corner reflector of the invention has a folding hinge triangular pyramid structure, and a hinge device is arranged between the reflecting surfaces at the left side and the right side of the upper part of the artificial corner reflector; the two reflecting surfaces of the upper part and the reflecting surface of the bottom part are connected through hinge devices, once observation is finished, the whole corner reflector can be folded into a triangular plane through each hinge device, and the reflecting part, the tripod and the adjusting device are very easy to carry.
(2) Meanwhile, the manufacturing material is carbon fiber and a composite electroplating coating, so the weight is light and the carrying is convenient; because the lower part of the reflector adopts a tripod and a bearing device, the reflector has the same strong portability, and can be completely placed into a trunk of a vehicle for packing and taking away.
(3) The artificial corner reflector of the invention forms a triangular pyramid structure by three mutually perpendicular flat plates, wherein the flat plates are carbon fiber flat plates; due to its special geometry, it produces multiple internal reflections of the incident electromagnetic wave, with a strong Radar Cross Section (Radar Cross Section RCS). The invention adopts three carbon fiber flat plates which are mutually vertical in pairs, a uniform structure consisting of a silver coating and a gold-plated matrix grid is arranged on the carbon fiber flat plates, and small holes are arranged on a reflecting plane at the bottom of the carbon fiber flat plates for draining water in rainy days or reducing the influence of strong wind on a corner reflector.
(4) the corner reflector solves the problems that the corner reflector in the prior art is usually made of aluminum alloy materials, so that the total reflectivity of the corner reflector to light is low, and particularly the total reflectivity of the corner reflector can be further reduced along with the oxidation process of the aluminum alloy materials and the outdoor wind, sunlight and rain. The invention takes thin-layer carbon fiber as a back plate, the weight is light, the strength is high, the back plate is not easy to deform, the thickness is 0.6mm, the side length of a right-angle side of the corner reflector is 0.5m, and a silver coating is sprayed on the surface layer of the back plate, so that the surface reflectivity of the back plate is greatly higher than that of the prior aluminum alloy material. Meanwhile, in order to further improve the reflectivity of the surface, a gold-plated square matrix coating is added in the area of the reflection surface, the diameter of a square grid is 2mm, the distance between square grids is 2mm, and experiments prove that the surface material structure has a larger radar scattering sectional area, the reflection performance of the surface material structure is superior to that of a pure silver coating material, and the requirement of accurate calibration can be met.
(5) Meanwhile, the edge zone of the corner reflector has influence on the reflection of light rays, so that the edge zone of the reflector is provided with the black non-emission rubber strip, so that the black non-emission rubber strip can have an obvious segmentation boundary with surrounding ground objects, and the reflection characteristic can be conveniently extracted from the background which is easy to be confused.
(6) A corner reflector base adjusting device with a multidirectional adjusting function;
The part connected with the ground is of a steel tripod structure, the steel tripod structure is provided with three ground supporting points, each steel foot is 15mm in diameter, the length of a single support is 1m, the steel tripod structure is of a three-layer sleeve structure, and a fixing and stretching knob is arranged, so that the height can be adjusted according to requirements. The upper part of the device is provided with a warp angle adjusting device, a weft angle adjusting device and a pitch angle adjusting device, and the device is particularly shown in figure 2. The inside of the warp-wise angle adjusting device is of a bearing structure, and the outside of the warp-wise angle adjusting device can be adjusted by 0-360 degrees, so that the angle of the corner reflector can be adjusted according to the warp direction; the weft angle adjusting device is internally provided with a bearing structure, and the outer part of the weft angle adjusting device can be adjusted by 0-360 degrees, so that the angle of the corner reflector can be adjusted according to the weft direction; the pitch angle adjusting device is mainly a bearing for adjusting the pitch angle of the corner reflector, and the adjustable range of the angle is 0-180 degrees. The angle adjusting devices all use carbon fiber as a manufacturing material, and meet the requirements of lightness, strong rigidity and the like
Drawings
The advantages of the above and/or additional aspects of the present invention will become apparent and readily appreciated from the following description of the embodiments taken in conjunction with the accompanying drawings of which:
Fig. 1 is a schematic diagram of an artificial corner reflector for interferometric calibration of synthetic aperture radar in accordance with the present invention.
Fig. 2 is a schematic structural diagram of a corner reflector base adjustment device with multi-directional adjustment function for an artificial corner reflector for interferometry calibration of synthetic aperture radars according to the present invention.
Fig. 3 is a detailed block diagram of a meridional angle adjustment mechanism of an artificial corner reflector for synthetic aperture radar interferometry calibration according to the present invention.
Fig. 4 is a detailed structural diagram of a latitudinal angle adjustment device of an artificial corner reflector for interferometry calibration of synthetic aperture radars according to the present invention.
Fig. 5 is a detailed structural view of a pitch angle adjusting apparatus of an artificial corner reflector for interferometric calibration of a synthetic aperture radar according to the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
An artificial corner reflector for interferometric calibration of synthetic aperture radars according to an embodiment of the present invention, as shown in fig. 1 to 5, includes a corner reflector 1 and a base adjustment device.
The base adjustment means is connected to the corner reflector 1 and is configured for multidirectional adjustment of the corner reflector.
The corner reflector has a triangular pyramid structure with folding hinges, as shown in fig. 1. The corner reflector comprises a first plate 11, a second plate 12 and a third plate 13. The flat plates are perpendicular to each other two by two to form a triangular pyramid structure, and due to the special geometrical structure of the triangular pyramid structure, multiple internal reflections can be generated on incident electromagnetic waves, and the triangular pyramid structure has a strong backward Radar scattering Cross Section (Radar Cross Section RCS).
Preferably, the first plate 11, the second plate 12 and the third plate 13 are all light reflecting plates.
The first plate 11 and the second plate 12 are flat plates on both left and right sides of the upper portion of the corner reflector, each of which serves as a reflective surface, the first plate 11 includes a first plate first portion 111 and a first plate second portion 112, the first plate first portion 111 and the first plate second portion 112 are of a symmetrical structure, and a first hinge device 113 is provided between the first plate first portion 111 and the first plate second portion 112. The second panel 12 includes a first panel first portion 121 and a second panel second portion 122, which are symmetrical structures, with a second hinge arrangement 123 disposed therebetween.
Preferably, the first hinge means 113 comprises a first portion and a second portion, the first portion of the first hinge means being pivotally connected to the second portion of the first hinge means, the first portion of the first hinge means being connected to the first panel first portion, and the second portion of the first hinge means being connected to the first panel second portion, preferably the first hinge means being provided on an outer side wall of the first panel.
Preferably, the second hinge means 123 comprises a first portion and a second portion, the first portion of the second hinge means being pivotally connected to the second portion of the second panel, the first portion of the second hinge means being connected to the first portion of the second panel, and the second portion of the second hinge means being connected to the second portion of the second panel, preferably the second hinge means being provided on an outer side wall of said second panel.
Between the first and third panels there are third hinge means 14 and between the second and third panels fourth hinge means 15, by means of which the entire corner reflector can be folded into a triangular plane once viewing is complete, the reflecting part of which is very easy to carry.
Preferably, the third hinge 14 comprises a first portion and a second portion, the second portion of the first panel is connected to the third panel by a third hinge, the first portion of the third hinge is connected to the second portion of the first panel, the second portion of the third hinge is connected to the third panel, the first portion of the third hinge is rotatably connected to the second portion of the third hinge, and the first portion of the third hinge is preferably located on the inner side wall of the first panel.
Preferably, the fourth hinge means 15 comprises a first portion and a second portion, the second portion of the second panel is connected to the third panel by the fourth hinge means, the first portion of the fourth hinge means is connected to the second portion of the second panel, the second portion of the fourth hinge means is connected to the third panel, the first portion of the fourth hinge means is rotatably connected to the second portion of the fourth hinge means, and preferably, the first portion of the fourth hinge means is located on the inner side wall of the second panel.
The first plate, the second plate and the third plate are all triangular structures, when unfolded, the first plate and the second plate are connected with each other, the first plate and the second plate are respectively connected with the third plate to form a triangular pyramid structure, and when unfolded, the top ends of the first plate and the second plate are fixed through the buckle 16. The first plate, the second plate and the third plate are perpendicular to each other. The buckle is provided with a groove, the groove comprises two parts, and the two parts are perpendicular to each other and used for accommodating the tops of the first plate and the second plate to play a role in fixing.
Furthermore, the first plate, the second plate and the third plate are all of a three-layer structure and comprise a back plate, a silver coating layer and a gold-plated matrix grid layer; the back plates of the first plate, the second plate and the third plate are all thin-layer carbon fiber plates; the back plates are all provided with silver plating layers, the gold-plated matrix grid layer is arranged on the silver plating layers, and drain holes 17 are formed in the connecting positions of the rear ends of the third plates and the first plate and the second plate, are small holes with the diameter of 3mm, and are preferably three rows so as to drain water in rainy days or reduce the influence of strong wind on the corner reflector.
Preferably, the gold-plated matrix grid 18 is a square grid.
Preferably, the thin-layer carbon fiber plate has a thickness of 0.6mm, and the side length of the right-angle side of the corner reflector is 0.5 m.
And the surface layer of the thin-layer carbon fiber plate is sprayed with the silver coating, so that the surface reflectivity of the thin-layer carbon fiber plate is greatly higher than that of the prior aluminum alloy material. Meanwhile, in order to further improve the reflectivity of the surface, a gold-plated square matrix coating is added on the reflecting surface area.
Preferably, the diameter of the square grid in the gold-plated matrix grid layer is 2mm, and the space between each square is 2mm, as shown in fig. 1. Tests prove that the surface material structure has a larger radar scattering sectional area, the reflection performance of the surface material structure is superior to that of a pure silver coating material, and the requirement of accurate calibration can be met.
furthermore, because the edge zone of the corner reflector has influence on the reflection of light rays, the edge zone of each reflector is provided with a black non-emitting rubber strip, so that the reflector can have an obvious segmentation boundary with surrounding ground objects, and the reflection characteristic can be conveniently extracted from an unobvious background. The base adjusting device is positioned on the lower side of the third panel of the corner reflector and has a multidirectional adjusting function.
The base adjusting device comprises a warp angle adjusting device 2, a weft angle adjusting device 3, a pitching angle adjusting device 4 and a tripod 5.
The tripod 5 is a steel tripod, and serves as a portion connected to the ground. The tripod comprises a first steel foot, a second steel foot and a third steel foot; preferably, the diameter of each steel foot is 15mm, and the length of the single support is 1 m.
Preferably, each steel leg is of a three-layer sleeve structure and is provided with a fixed knob and a telescopic knob so as to adjust the height of the artificial corner reflector for calibrating the interferometry of the synthetic aperture radar from the ground according to the invention according to requirements.
Preferably, the internal structure of the warp-wise angle adjusting device 2 is shown in fig. 3, and the warp-wise angle adjusting device comprises a warp-wise angle adjusting shaft 21, a warp-wise angle adjusting handle 23, a warp-wise angle adjusting sleeve 24, a sleeve built-in baffle 25 and a warp-wise angle adjusting fixing screw 26. The built-in sleeve baffles 25 are arranged inside the warp-wise angle adjusting sleeve 24, the built-in sleeve baffles 25 are arranged in pairs in the warp-wise angle adjusting sleeve 24, the warp-wise angle adjusting shaft penetrates through the sleeve, and the diameter of the shaft section of the warp-wise angle adjusting shaft 21 between the two groups of baffles 25 is larger than that of other parts of the warp-wise angle adjusting shaft 21. The warp-wise angle adjustment sleeve is provided with a screw hole into which a warp-wise angle adjustment fixing screw 26 is mounted. The warp-wise angle adjusting handle is connected with a warp-wise angle adjusting shaft 21, and the warp-wise angle adjusting shaft 21 rotates at any angle in a warp-wise angle adjusting sleeve 24 through rotation of the warp-wise angle adjusting handle 23. After the adjustment is completed, it is fixed by a radial angle adjustment fixing screw 26.
Preferably, the meridional angle adjustment device further includes a meridional angle adjustment dial 28 and a meridional angle adjustment pointer 27. The warp-wise angle adjusting pointer 27 is connected with the warp-wise angle adjusting shaft 21, the warp-wise angle adjusting dial 28 is fixed on the warp-wise angle adjusting sleeve 24, the warp-wise angle adjusting shaft 21 rotates at any angle in the warp-wise angle adjusting sleeve 24 through the rotation of the angle adjusting handle 23, the angle before and after rotation is determined through the pointer 27 on the warp-wise angle adjusting shaft 21 and the angle scale on the warp-wise angle adjusting sleeve 24, and the angle can be fixed by screwing the fixing screw 26 after adjustment. The warp-wise angle adjusting sleeve 24 is connected with the weft-wise angle adjusting device 3 in a welding manner, and the outer portion of the warp-wise angle adjusting sleeve 24 can be adjusted by an angle of 0-360 degrees.
According to the embodiment of the invention, the diameter of the warp-wise angle adjusting sleeve 24 is 25cm, the warp-wise angle adjusting shaft penetrates through the warp-wise angle adjusting sleeve, and the first end of the warp-wise angle adjusting shaft 21 is connected with the corner reflector in a welding mode. Preferably, a supporting plate is arranged at a first end of the warp-wise angle adjusting shaft, and the warp-wise angle adjusting shaft is fixedly connected with the third plate through the supporting plate 29. Preferably, the support plate is a cylindrical structure, wherein the diameter of the radial angle adjusting shaft 21 is 10cm, and the diameter of the support plate connected with the corner reflector is 40cm, so as to increase the welding area with the corner reflector, thereby avoiding any shaking of the corner reflector and affecting the calibration accuracy. The internal reducing of warp direction angle modulation axle at the built-in baffle of sleeve is 20cm, and this makes warp direction angle modulation axle can rely on angle adjustment handle's rotation to carry out the rotation of arbitrary angle in the sleeve, and the angle around the rotation can be confirmed through the pointer on the warp direction angle modulation axle and the angle scale on the sleeve, and the angle can be fixed by screwing up set screw after adjusting. The warp-wise angle adjusting sleeve is connected with the weft-wise angle adjusting device in a welding mode. The outer part of the device can be adjusted by an angle of 0-360 degrees.
The upper part of the tripod 5 is provided with a warp angle adjusting device 2, a weft angle adjusting device 3 and a pitching angle adjusting device 4. The corner reflector 1 is fixed on the upper part of a warp-wise angle adjusting shaft 21 in the warp-wise angle adjusting device 2, wherein the warp-wise angle adjusting shaft 21 and the corner reflector 1 are connected together in a welding manner. Preferably, the diameter of the warp-wise angle-adjusting shaft 21 is 10cm, which is changed to 40cm at the end connected to the corner reflector 1, for example, in order to increase the welding area with the corner reflector 1, thereby preventing any shaking of the corner reflector 1, which affects the calibration accuracy.
the warp-wise angle adjusting fixing screw 26 is a screw locking structure which passes through the screw hole of the warp-wise angle adjusting sleeve and directly abuts against the warp-wise angle adjusting shaft 21, can ensure that the warp-wise angle adjusting sleeve 24 and the warp-wise angle adjusting shaft 21 cannot be displaced when in a locking position, and can adjust the warp-wise angle through the warp-wise angle adjusting shaft 21 when in a loosening position.
The structure inside at warp direction angle modulation sleeve is as shown in fig. 3, warp direction angle modulation sleeve diameter is 25cm, the inside part of baffle is built-in to warp direction angle modulation axle at the sleeve, the diameter becomes 20cm, this makes warp direction angle modulation axle can rely on warp direction angle modulation handle, enclose the arbitrary rotation of center in warp direction angle modulation sleeve, and angle around rotating can be through the angle scale on warp direction angle modulation pointer and the warp direction angle modulation sleeve on the warp direction angle modulation axle, if, the warp direction angle modulation calibrated scale is confirmed, the angle can be fixed by screwing up the set screw after adjusting. The warp-wise angle adjusting sleeve is connected with a weft-wise angle adjusting shaft in the weft-wise angle adjusting device in a welding mode.
Preferably, the warp-wise angle adjusting sleeve is connected with the first end of the weft-wise angle adjusting shaft by welding. Latitudinal direction angle adjusting device 3 includes latitudinal direction angle adjusting shaft 31, latitudinal direction angle adjusting sleeve 32, latitudinal direction angle adjusting fixed screw 33 and latitudinal direction angle adjusting handle 34.
The latitudinal direction angle adjusting sleeve 32 is internally provided with a second sleeve built-in baffle 35, the second sleeve built-in baffle 35 inside the latitudinal direction angle adjusting sleeve 32 is arranged in a paired mode in the latitudinal direction angle adjusting sleeve 32, the latitudinal direction angle adjusting shaft 31 passes through the latitudinal direction angle adjusting sleeve 32, and the diameter of the shaft section of the latitudinal direction angle adjusting shaft 31 between the two sets of second sleeve built-in baffles 35 is larger than the diameter of other parts of the latitudinal direction angle adjusting shaft 31. The latitudinal direction angle adjustment sleeve 32 is provided with a screw hole, and the latitudinal direction angle adjustment fixing screw 33 is installed in the screw hole. The latitudinal direction angle adjusting handle is connected with the latitudinal direction angle adjusting shaft, and the latitudinal direction angle adjusting shaft rotates at any angle in the latitudinal direction angle adjusting sleeve through the rotation of the latitudinal direction angle adjusting handle. After the adjustment is completed, the fixing is performed by the latitudinal angle adjusting fixing screw 33.
Preferably, the latitudinal angle adjustment device further comprises a latitudinal angle adjustment dial 36 and a latitudinal angle adjustment pointer 37. Latitudinal direction angle adjustment pointer 37 is connected with latitudinal direction angle adjustment shaft 31, and latitudinal direction angle adjustment dial 36 is fixed on latitudinal direction angle adjustment sleeve 32, and latitudinal direction angle adjustment shaft 31 carries out the rotation of arbitrary angle through the rotation of latitudinal direction angle adjustment handle 34 in latitudinal direction angle adjustment sleeve 32, confirms the angle around rotating through pointer 37 on latitudinal direction angle adjustment shaft 31 and the angle dial 36 on the latitudinal direction angle adjustment sleeve 32, and the angle can be screwed up the set screw after the regulation and fix.
Preferably, latitudinal direction angle adjusting device inner structure refers to fig. 4, and latitudinal direction angle adjusting sleeve 32 diameter is 25cm, and latitudinal direction angle adjusting shaft 31 runs through whole latitudinal direction angle adjusting sleeve structure, and the first end of latitudinal direction angle adjusting shaft 31 and warp direction angle adjusting device 2 adopt the welded mode to be connected. A second end of the latitudinal angle adjusting shaft 31 is provided with a latitudinal angle adjusting handle 34. Preferably, the diameter of the latitudinal angle adjusting shaft 31 is 10cm, but the inner diameter of the baffle 35 arranged in the second sleeve of the latitudinal angle adjusting sleeve 32 is 20cm, so that the latitudinal angle adjusting shaft 31 can rotate at any angle in the latitudinal angle adjusting sleeve 32 by means of the rotation of the latitudinal angle adjusting handle 34, the angle before and after rotation can be determined by a pointer 37 on the latitudinal angle adjusting shaft 31 and an angle dial 36 on the sleeve, and the latitudinal angle adjusting fixing screw 34 can be screwed to fix the angle after adjustment. The latitudinal angle adjusting sleeve 32 is connected with the pitch angle adjusting device 4 by welding. The outer part of the device can be adjusted by an angle of 0-360 degrees. Latitudinal direction angle accommodate sleeve diameter is 25cm, the part of latitudinal direction angle accommodate shaft between the built-in baffle 35 of latitudinal direction angle accommodate sleeve's second sleeve, the diameter of latitudinal direction angle accommodate shaft becomes 20cm, this makes latitudinal direction angle accommodate shaft can rely on latitudinal direction angle accommodate handle, enclose the rotation wantonly around the center in latitudinal direction angle accommodate sleeve, and the angle around the rotation can be confirmed through latitudinal direction angle accommodate pointer on the latitudinal direction angle accommodate shaft and the latitudinal direction angle accommodate calibrated scale on the sleeve, the fixed screw of latitudinal direction angle accommodate can be screwed up after the angle is adjusted and fix. The latitudinal direction angle adjusting sleeve is connected with the pitch angle adjusting device in a welding mode.
The pitch angle adjusting device 4 comprises a pitch angle adjusting platform 41, a pitch angle adjusting dial 42, a pitch angle adjusting pointer 43 and a pitch angle adjusting fixing screw 44, as shown in fig. 5, the angle of the pitch angle adjusting device is determined by adjusting an included angle between a latitudinal angle adjusting sleeve and a tripod, the angle adjusting range is 0-180 degrees, the angle is determined by the pitch angle adjusting pointer and the dial, and the pitch angle adjusting fixing screw can be screwed to fix the angle after the angle is adjusted. Preferably, the pitch angle adjusting device is as shown in fig. 5, the angle adjustment is determined by manually adjusting the included angle between the latitudinal angle adjusting sleeve and the tripod, the angle adjustment range is 0-180 degrees, the angle size is determined by the pitch angle adjusting pointer and the dial, and the angle can be fixed by screwing the fixing screw after being adjusted.
The lower part of every single move angle regulation platform sets up first connecting portion, first connecting portion are connected with the first end of tripod, the second end of tripod is as the ground fulcrum.
the upper part of the tripod is provided with a warp angle adjusting device, a weft angle adjusting device and a pitch angle adjusting device, as shown in figure 2.
preferably, weights 22 are provided along the lower portion of the angle adjusting shaft, and preferably, the weights are provided in plural sets to be weighted according to the weight of the corner reflector. Preferably, the weights at the lower part of the longitudinal angle adjustment axis are each 1kg, and will be weighted according to the weight of the upper corner reflector, and typically 2-3 weights will be used for balancing.
Preferably, every single move angle adjusting device, latitudinal direction angle adjusting device and warp direction angle adjusting device all use the carbon fiber as manufacturing material, satisfy requirements such as light, rigidity are strong.
The artificial corner reflector overcomes the defects that the angle adjustment is very complicated and the accuracy of the adjustment cannot be guaranteed due to the fact that a fixed point retaining ring is adopted for connection in the prior art, and the adjustment of the angle each time needs a long time and complexity; meanwhile, the problem that the corner reflector made of aluminum skin and aluminum honeycomb materials in the prior art is not ideal for radar reflection and cannot reflect electromagnetic waves in multiple frequency bands is solved, and after the corner reflector is subjected to wind and rain, the reflection performance of the aluminum material is low, so that the reflectivity is influenced. In addition, the middle lower part of the corner reflector disclosed by the invention is provided with the hollowed-out small hole, so that rainwater can be directly discharged to the ground.
The artificial corner reflector solves the problems that the lower part of the corner reflector in the prior art is fixed in a cement pier by using two steel columns, and the upper part of the corner reflector is vertically welded by using three aluminum masks, so that the corner reflector is not portable and cannot be dismantled once being installed.
the artificial corner reflector solves the problems that the corner reflector in the prior art adopts an aluminum skin structure, the total reflectivity of the corner reflector to light is low, and particularly the total reflectivity of the corner reflector is further reduced along with the oxidation process of aluminum materials and outdoor wind, sun and rain.
Meanwhile, the manufacturing material is carbon fiber and a composite electroplating coating, so the weight is light and the carrying is convenient; because the lower part of the reflector adopts a tripod and a bearing device, the reflector has the same strong portability, and can be completely placed into a trunk of a vehicle for packing and taking away.
The artificial corner reflector can be used for measuring ground settlement, ground cracks, sudden geological disasters and major linear engineering.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. Those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "at least three" means two or more unless otherwise specified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. An artificial corner reflector for interferometric calibration of synthetic aperture radars, comprising a corner reflector and a base adjustment device; the base adjusting device is connected with the corner reflector; the corner reflector is provided with folding hinge devices, and the whole corner reflector is folded into a triangular plane through each hinge device after observation is finished; the corner reflector comprises a first plate, a second plate and a third plate; every two flat plates are mutually perpendicular to form a triangular pyramid structure, and are light reflecting plates, and the top ends of the first plate and the second plate are fixed through buckles when the light reflecting plates are unfolded; the buckle is a detachable rubber triangular pyramid device and is used for fixing the top end of the corner reflector when the corner reflector is opened so as to prevent bifurcation; the first plate and the second plate are flat plates on the left side and the right side of the upper part of the corner reflector, each plate is used as a reflecting surface, the first plate comprises a first plate first part and a first plate second part, the first plate first part and the first plate second part are of symmetrical structures, and a first hinge device is arranged between the first plate first part and the first plate second part; the second plate comprises a second plate first part and a second plate second part, the second plate first part and the second plate second part are of symmetrical structures, and a second hinge device is arranged between the second plate first part and the second plate second part;
The first hinge device comprises a first part and a second part, the first part of the first hinge device is rotatably connected with the second part of the first hinge device, the first part of the first hinge device is connected with the first part of the first plate, the second part of the first hinge device is connected with the second part of the first plate, and the first hinge device is arranged on the outer side wall of the first plate;
The second hinge device comprises a first part and a second part, the first part of the second hinge device is rotatably connected with the second part of the second hinge device, the first part of the second hinge device is connected with the first part of the second plate, the second part of the second hinge device is connected with the second part of the second plate, and the second hinge device is arranged on the outer side wall of the second plate;
A third hinge device is arranged between the first plate and the third plate, and a fourth hinge device is arranged between the second plate and the third plate;
The third hinge device comprises a first part and a second part, the second part of the first plate is connected with a third plate through a third hinge device, the first part of the third hinge device is connected with the second part of the first plate, the second part of the third hinge device is connected with the third plate, the first part of the third hinge device is rotatably connected with the second part of the third hinge device, and the first part of the third hinge device is positioned on the inner side wall of the first plate;
the fourth hinge device comprises a first part and a second part, the second part of the second plate is connected with the third plate through the fourth hinge device, the first part of the fourth hinge device is connected with the second part of the second plate, the second part of the fourth hinge device is connected with the third plate, the first part of the fourth hinge device is rotatably connected with the second part of the fourth hinge device, and the first part of the fourth hinge device is positioned on the inner side wall of the second plate; the first plate, the second plate and the third plate are all of three-layer structures, and each three-layer structure comprises a back plate, a silver coating layer and a gold-plated matrix grid layer; the back plates of the first plate, the second plate and the third plate are all thin-layer carbon fiber plates; the back plates are all provided with silver coatings, and a gold-plated matrix grid layer is arranged on the silver coatings.
2. The artificial corner reflector for interferometric calibration of synthetic aperture radar according to claim 1, wherein a drain hole is provided at the junction of the rear end of the third plate with the first and second plates.
3. the artificial corner reflector for interferometry calibration of synthetic aperture radar according to claim 2, wherein the gold-plated matrix grid is a square grid, the thickness of the thin-layer carbon fiber plate is 0.6mm, the diameter of the square grid in the gold-plated matrix grid layer is 2mm, and the spacing between squares is 2 mm.
4. The artificial corner reflector for interferometry calibration of synthetic aperture radar according to claim 3, wherein the edge of each reflector is mounted with non-reflective rubber strips for achieving a well-defined segmentation from surrounding terrain.
5. The artificial corner reflector for interferometry calibration of synthetic aperture radar according to claim 4, wherein the base adjustment means comprises a warp angle adjustment means, a weft angle adjustment means, a pitch angle adjustment means and a tripod, and the warp angle adjustment means, the weft angle adjustment means and the pitch angle adjustment means are arranged at the upper part of the tripod; the warp angle adjusting device is fixedly connected with the weft angle adjusting device, the weft angle adjusting device is fixedly connected with the pitching angle adjusting device, the pitching angle adjusting device is connected with the tripod, and the corner reflector is fixed on the upper portion of a warp angle adjusting shaft in the warp angle adjusting device.
6. The artificial corner reflector for interferometry calibration of the synthetic aperture radar according to claim 5, wherein the meridional angle adjusting device comprises a meridional angle adjusting shaft, a meridional angle adjusting handle, a meridional angle adjusting sleeve, sleeve built-in baffles and meridional angle adjusting fixing screws, the sleeve built-in baffles are arranged inside the meridional angle adjusting sleeve, the sleeve built-in baffles are arranged in pairs inside the sleeve, the meridional angle adjusting shaft penetrates through the sleeve, and the diameter of a shaft section of the meridional angle adjusting shaft, which is located between the two groups of baffles, is larger than that of other parts of the meridional angle adjusting shaft; warp direction angle adjustment sleeve is provided with the screw hole, and warp direction angle adjustment fixed screw installs to this screw hole, and warp direction angle adjustment handle is connected with warp direction angle adjustment axle, and warp direction angle adjustment axle carries out the rotation of arbitrary angle in warp direction angle adjustment sleeve through angle adjustment handle's rotation, adjusts the completion back, fixes through warp direction angle adjustment fixed screw.
7. The artificial corner reflector for interferometry calibration of synthetic aperture radar according to claim 6, wherein the meridional angle adjustment means further comprises a meridional angle adjustment dial and a meridional angle adjustment pointer; the warp-wise angle adjusting pointer is connected with the warp-wise angle adjusting shaft, and the warp-wise angle adjusting dial is fixed on the sleeve.
8. The artificial corner reflector for interferometry calibration of synthetic aperture radar according to claim 7, wherein the latitudinal angle adjustment sleeve is connected with the pitch angle adjustment device by welding, and the exterior of the latitudinal angle adjustment sleeve can be angularly adjusted by 0-360 degrees; the warp-wise angle adjusting sleeve is connected with the weft-wise angle adjusting device in a welding mode, and the outer part of the warp-wise angle adjusting sleeve can be adjusted by 0-360 degrees; the angle of the pitch angle adjusting device is determined by adjusting the included angle between the latitudinal angle adjusting sleeve and the tripod, and the adjusting range of the angle is 0-180 degrees.
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| WO2021083853A1 (en) * | 2019-10-28 | 2021-05-06 | Geopartner Inspections A/S | System for use in determining the change in elevation and/or lateral displacement of a geographic location over time, and a link for such a system |
| CN110824435A (en) * | 2019-11-13 | 2020-02-21 | 北京环境特性研究所 | Water accumulation preventing corner reflector and mounting method thereof |
| CN113466846B (en) * | 2021-06-10 | 2024-03-26 | 上海铁路北斗测量工程技术有限公司 | High-speed railway bridge deviation monitoring method and system |
| CN113640748B (en) * | 2021-08-13 | 2024-01-26 | 西南大学 | Low-operation-dimension modularized corner reflector suitable for complex mountain area |
| CN116008988A (en) * | 2023-02-24 | 2023-04-25 | 中国科学院空天信息创新研究院 | Three-face angle passive scaler for quantitative remote sensing |
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| CN2113498U (en) * | 1992-02-20 | 1992-08-19 | 无锡市多通机械厂 | Angular reflection device for radar |
| RU2185013C2 (en) * | 2000-04-25 | 2002-07-10 | Центральный научно-исследовательский институт машиностроения | Radar flexible corner reflector |
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