Dual-purpose registration target for ground-based laser radar and aerial photogrammetry

Abstract

The utility model relates to the technical field of measurement and calibration, and discloses a dual-purpose registration target for foundation laser radar and aerial photogrammetry, which comprises a target frame, a target plate is fixedly arranged in the middle of the upper end of the target frame, the target plate consists of a marking target and a laser radar transmitting target, ground inserting cylinders are arranged at four corners of the target frame in a sliding manner, and the ground inserting cylinders are connected with the laser radar transmitting target. Adjusting mechanisms are arranged at the four corners of the side face of the target frame correspondingly, ground inserting cones are fixedly arranged at the lower ends of the four ground inserting cylinders correspondingly, a plurality of driven bevel gears are rotatably arranged at the positions, close to the lower ends, in the ground inserting cylinders at equal intervals, the outer ends of the driven bevel gears are fixedly connected with sleeves correspondingly, and threaded rods are arranged in the sleeves in a threaded mode correspondingly. And the outer ends of the multiple threaded rods are fixedly connected with ground gripping cones correspondingly, and rotating rods are rotationally arranged in the middles of the interiors of the four ground inserting cylinders correspondingly. According to the utility model, the dual-purpose registration target is high in stability, and can be accurately arranged in soft soil and complex terrains.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement and calibration, in particular to a registration target for both ground-based lidar and aerial photogrammetry. Background Technique

[0002] The unmanned aerial vehicle (UAV) aerial photogrammetry system has the characteristics of small volume, low cost, flexibility, high imaging resolution, high speed and efficiency, and can quickly obtain high-quality and high-resolution remote sensing images. It can carry out operations in harsh environments and areas with high risks. Especially in small areas and areas with complex terrain and meteorological conditions, the flexibility and wide application range of UAV remote sensing are fully demonstrated. The ground-based lidar has functions such as three-dimensional simulation modeling, and has a complementary role with aerial photography to a certain extent in three-dimensional simulation modeling. When using a UAV to conduct oblique photogrammetry and three-dimensional modeling of terrain and buildings, due to the complexity of some areas and building shapes, the local modeling accuracy is insufficient. At this time, the ground-based lidar can be used to perform local area scanning measurement and three-dimensional simulation modeling. Its modeling accuracy is higher than that of aerial photogrammetry, and its point cloud data can assist the local model repair work of the oblique photogrammetry modeling results.

[0003] When the ground-based lidar is operating in the wild such as forest land, due to the lack of obvious texture features in the surrounding environment and insufficient existing known data, its orientation and registration are difficult to achieve, and it is difficult to register with the UAV image processing data during data processing after measurement. Therefore, ground control points need to be set on the ground during UAV photogrammetry, and at the same time, the point cloud data measured by the ground-based lidar needs to be registered.

[0004] The existing patent (application number: CN201922357141.X) discloses a registration target for both ground-based lidar and aerial photogrammetry. The device supports the upper registration target through a tripod. Although it can be applied to the wild area, there will be strong winds in the wild area during special seasons, which are likely to blow down the tripod and the stability is not high. Therefore, those skilled in the art provide a registration target for both ground-based lidar and aerial photogrammetry to solve the problems raised in the above background technique. Content of the Utility Model

[0005] The purpose of the content of the utility model is to solve the shortcomings existing in the prior art, and to propose a registration target for both ground-based lidar and aerial photogrammetry, which has high stability and can be accurately arranged on soft soil land and complex terrain.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A ground-based lidar and aerial photogrammetry dual-use registration target, including a target frame. In the middle of the upper end of the target frame, a target board is fixedly arranged. The target board is composed of a marking target and a lidar emission target. At the four corners of the target frame, insertion cylinders are slidably arranged. At the four corners of the side of the target frame, adjustment mechanisms are arranged. At the lower ends of the four insertion cylinders, insertion cones are fixedly arranged. Inside the insertion cylinders, a plurality of driven bevel gears are rotatably arranged at equal intervals near the lower end. At the outer ends of the plurality of driven bevel gears, sleeves are fixedly connected. Inside the plurality of sleeves, threaded rods are arranged. At the outer ends of the plurality of threaded rods, gripping cones are fixedly connected. In the middle of the four insertion cylinders, rotating rods are rotatably arranged. At the lower ends of the four rotating rods, driving bevel gears are fixedly connected. The four driving bevel gears are respectively meshed and connected with the corresponding driven bevel gears.

[0008] Further, the marking target includes a target center, black target blocks and white target blocks. The marking target is evenly divided into eight pieces in a cross shape, corresponding to the black target blocks and the white target blocks respectively.

[0009] Further, the four black target blocks and the four white target blocks are fixedly arranged around the target center in an alternating manner;

[0010] Through the above technical solution, the marking target can be used as a ground control point for aerial photogrammetry.

[0011] Further, the lidar emission target includes bearing blocks respectively arranged at the four corners of the surface of the target board. At the upper ends of the four bearing blocks, reflecting strips are fixedly arranged;

[0012] Through the above technical solution, the lidar emission target enables it to perform the functions of orientation and registration during ground-based lidar operations.

[0013] Further, the adjustment mechanism includes sliding holes opened at the four corners of the target frame and four adjusting screws. The four insertion cylinders slide in the corresponding sliding holes respectively. The four adjusting screws are threaded on the side of the target board, and the inner ends of the four adjusting screws extend into the corresponding sliding holes respectively;

[0014] Through the above technical solution, by rotating the adjusting screws, the insertion cylinders are lifted or lowered, so that the device is suitable for uneven terrains.

[0015] Further, chutes are opened on the upper end surfaces of the plurality of threaded rods. Inside the insertion cylinders and at the upper ends of the threaded rods, sliders are fixedly arranged. The plurality of sliders are respectively limited and slide inside the corresponding chutes;

[0016] Through the above technical solution, through the action of the sliders and the chutes, the threaded rods are limited, so that the rotation of the sleeves drives the threaded rods to move.

[0017] Furthermore, multiple said reflecting strips are all made of aluminum material;

[0018] Through the above technical solution, the reflecting strip made of aluminum material slows down the purpose of its rusting and increases the service life of the reflecting strip.

[0019] The utility model has the following beneficial effects:

[0020] A dual-purpose registration target for ground-based lidar and aerial photogrammetry proposed by the utility model is inserted into the ground through the ground-inserting cylinders at the four corners. Compared with the prior art of using a tripod to support the target board, this device has higher stability. At the same time, through the action of the extendable ground-gripping cones, the stability of the target is further improved, preventing the ground-inserting cylinders from tilting, and is applicable to soft soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a perspective view of a dual-purpose registration target for ground-based lidar and aerial photogrammetry proposed by the utility model;

[0022] Figure 2 is a schematic diagram of the target distribution of a dual-purpose registration target for ground-based lidar and aerial photogrammetry proposed by the utility model;

[0023] Figure 3 is a schematic diagram of the structure of the ground-inserting cylinder of a dual-purpose registration target for ground-based lidar and aerial photogrammetry proposed by the utility model;

[0024] Figure 4 is a schematic diagram of the structure of the inserting rod of a dual-purpose registration target for ground-based lidar and aerial photogrammetry proposed by the utility model;

[0025] Figure 5 is a partial exploded view of the ground-inserting cylinder of a dual-purpose registration target for ground-based lidar and aerial photogrammetry proposed by the utility model.

[0026] LEGEND DESCRIPTION:

[0027] 1. Target frame; 2. Target board; 3. Marking target; 31. Bull's-eye; 32. Black target block; 33. White target block; 4. Lidar emission target; 41. Bearing block; 42. Reflecting strip; 5. Ground-inserting cylinder; 6. Adjusting mechanism; 61. Slide hole; 62. Adjusting screw; 7. Ground-gripping cone; 8. Driven bevel gear; 9. Sleeve; 10. Threaded rod; 11. Ground-gripping cone; 12. Chute; 13. Slide block; 14. Rotating rod; 15. Driving bevel gear. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, in combination with the drawings in the specific embodiments of the present utility model, the technical solutions in the specific embodiments of the present utility model will be clearly and completely described. Obviously, the described specific embodiments are only a part of the specific embodiments of the present utility model, rather than all of the specific embodiments. Based on the specific embodiments of the present utility model, all other specific embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0029] Referring to Figures 1-5 , a specific embodiment provided by the present utility model: a ground-based lidar and aerial photogrammetry dual-use registration target, including a target frame 1, a target board 2 is fixedly arranged in the middle of the upper end of the target frame 1. The target board 2 is composed of a marker target 3 and a lidar emission target 4. Insertion cylinders 5 are slidably arranged at the four corners of the target frame 1. Adjusting mechanisms 6 are arranged at the four corners of the side surface of the target frame 1. Insertion cones 7 are fixedly arranged at the lower ends of the four insertion cylinders 5. A plurality of driven bevel gears 8 are rotatably arranged at equal intervals near the lower end inside the insertion cylinders 5. Sleeve 9 is fixedly connected to the outer end of each of the plurality of driven bevel gears 8. Threaded rods 10 are arranged inside the plurality of sleeves 9 in a threaded manner. Gripping cones 11 are fixedly connected to the outer ends of the plurality of threaded rods 10. Rotating rods 14 are rotatably arranged in the middle of the four insertion cylinders 5. Driving bevel gears 15 are fixedly connected to the lower ends of the four rotating rods 14. The four driving bevel gears 15 are respectively meshed and connected with the corresponding driven bevel gears 8;

[0030] The marker target 3 includes a target center 31, black target blocks 32 and white target blocks 33. The marker target 3 is evenly divided into eight pieces in a cross shape, corresponding to the black target blocks 32 and the white target blocks 33 respectively. The four black target blocks 32 and the four white target blocks 33 are fixedly arranged around the target center 31 in an alternating manner. The marker target 3 can be used as a ground image control point for aerial photogrammetry;

[0031] The lidar emission target 4 includes bearing blocks 41 respectively arranged at the four corners of the surface of the target board 2. Reflective strips 42 are fixedly arranged at the upper ends of the four bearing blocks 41. The lidar emission target 4 enables it to perform the functions of orientation and registration during ground-based lidar operations;

[0032] The adjusting mechanism 6 includes sliding holes 61 opened at the four corners of the target frame 1 and four adjusting screws 62. The four insertion cylinders 5 slide in the corresponding sliding holes 61 respectively. The four adjusting screws 62 are arranged on the side surface of the target board 2 in a threaded manner. The inner ends of the four adjusting screws 62 extend into the corresponding sliding holes 61 respectively. By rotating the adjusting screws 62, the insertion cylinders 5 are lifted and lowered, so that the device is suitable for uneven terrains;

[0033] Chute grooves 12 are provided on the upper end surfaces of multiple threaded rods 10. Sliders 13 are fixedly arranged inside the ground-inserting cylinder 5 and at the upper ends of the threaded rods 10. The multiple sliders 13 are respectively limited and slide inside the corresponding chute grooves 12. Through the action of the sliders 13 and the chute grooves 12, the threaded rods 10 are limited, so that the rotation of the sleeve 9 drives the threaded rods 10 to move.

[0034] Multiple reflecting strips 42 are all made of aluminum material. By using the reflecting strips 42 made of aluminum material, the purpose of slowing down their rusting is achieved, and the service life of the reflecting strips 42 is increased.

[0035] Working principle: When the ground-based lidar and aerial photogrammetry dual-purpose registration target is in use, by rotating the adjusting screw 62, the ground-inserting cylinder 5 is lifted and lowered. The ground-inserting cylinder 5 is inserted into the soil. By rotating the rotating rod 14, the driving bevel gear 15 is driven to rotate, so that the engaged driven bevel gear 8 drives the sleeve 9 to rotate. Affected by the limitation of the slider 13 and the chute groove 12, the threaded rod 10 moves inside the sleeve 9, so that the ground-gripping cone 11 extends out of the ground-inserting cylinder 5, and the ground-gripping cone 11 is horizontally inserted into the soil to increase the stability of the ground-inserting cylinder 5. The laser radar emits the target 4 to perform the functions of orientation and registration during ground-based lidar operations. The marking target 3 can be used as a ground image control point for aerial photogrammetry.

[0036] Finally, it should be noted that the above are only the preferred specific embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing specific embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dual-purpose registration target for ground-based laser radar and aerial photogrammetry, comprising a target stand (1), characterized in that: A target plate (2) is fixedly arranged at the middle of the upper end of the target frame (1), and the target plate (2) is composed of a marking target (3) and a laser radar emission target (4). Ground insertion tubes (5) are slidably arranged at the four corners of the target frame (1), and adjustment mechanisms (6) are arranged at the four corners of the side of the target frame (1). Ground insertion cones (7) are fixedly arranged at the lower ends of the four ground insertion tubes (5). A plurality of driven bevel gears (8) are equidistantly arranged in rotation inside the ground insertion tubes (5), and the plurality of ground insertion cones (7) are fixedly arranged at the lower ends of the four ground insertion tubes (5). The outer ends of the driven bevel gears (8) are fixedly connected to sleeves (9), the interiors of the sleeves (9) are threadedly provided with threaded rods (10), the outer ends of the threaded rods (10) are fixedly connected to ground-grabbing cones (11), the middle parts of the four ground-inserting tubes (5) are rotatably provided with rotating rods (14), the lower ends of the four rotating rods (14) are fixedly connected to driving bevel gears (15), and the four driving bevel gears (15) are respectively meshed and connected with the corresponding driven bevel gears (8).

2. A ground-based laser radar and aerial photogrammetry dual-purpose registration target according to claim 1, characterized in that: The marking target (3) comprises a bull's eye (31), a black target block (32) and a white target block (33); the marking target (3) is evenly divided into eight blocks in a cross shape, corresponding to the black target block (32) and the white target block (33), respectively.

3. A dual-purpose registration target for ground-based laser radar and aerial photogrammetry according to claim 2, characterized in that: The four black target blocks (32) and the four white target blocks (33) are fixedly arranged in an interlaced manner around the target center (31).

4. A ground-based laser radar and aerial photogrammetry dual-purpose registration target according to claim 1, characterized in that: The laser radar emission target (4) comprises bearing blocks (41) respectively arranged at the four corners of the surface of the target plate (2), and the upper ends of the four bearing blocks (41) are all fixedly provided with reflection strips (42).

5. The dual-purpose registration target for ground-based laser radar and aerial photogrammetry according to claim 1, characterized in that: The adjustment mechanism (6) comprises sliding holes (61) and four adjusting screws (62) provided at four corners of the target frame (1); the four ground inserting tubes (5) slide in the corresponding sliding holes (61) respectively; the four adjusting screws (62) are threadedly arranged on the side of the target plate (2); the inner ends of the four adjusting screws (62) extend into the corresponding sliding holes (61) respectively.

6. A dual-purpose registration target for ground-based laser radar and aerial photogrammetry according to claim 1, characterized in that: The upper end surfaces of the plurality of threaded rods (10) are each provided with a slide groove (12), and a slider (13) is fixedly provided inside the ground insertion tube (5) and located at the upper end of the threaded rod (10), and the plurality of sliders (13) are respectively limitedly slidable inside the corresponding slide groove (12).

7. A ground-based laser radar and aerial photogrammetry dual-purpose registration target according to claim 4, characterized in that: The plurality of reflective strips (42) are all made of aluminum.

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