A target device for remote sensing monitoring of water quality by unmanned aerial vehicles (UAVs)

Abstract

The present invention provides a target device for remote sensing monitoring of water quality by unmanned aerial vehicles, comprising an unmanned aerial vehicle body, mounting rods are threadedly connected at the four corners of the bottom of the unmanned aerial vehicle body, and an automatic delivery mark is installed at the lower part of each mounting rod, and the automatic delivery mark is composed of a disassembly assembly component and an umbrella-shaped folding assembly, and a paper tape is arranged on the outside of the umbrella-shaped folding assembly, and a contraction assembly is arranged inside the umbrella-shaped folding assembly, and the disassembly assembly comprises a protective sleeve, a fixed cover with holes is threadedly connected at the upper end of the protective sleeve, and a connecting inner tube is threadedly connected in the hole inside the fixed cover with holes. The umbrella-shaped folding assembly in the automatic delivery mark of the present invention can realize the carrying and follow-up delivery of the unmanned aerial vehicle body through the umbrella-shaped folding method, and the umbrella-shaped folding assembly can ensure rapid falling and will not deviate too far from the unmanned aerial vehicle body during the delivery process due to the initial velocity of the unmanned aerial vehicle body, so as to ensure that the calibration point can be present in the image of the unmanned aerial vehicle body at any time.

Description

Technical Field

[0001] The invention belongs to the technical field of water quality remote sensing monitoring, and in particular relates to a target device for unmanned aerial vehicle (UAV) water quality remote sensing monitoring. Background Art

[0002] Accurate and comprehensive water quality monitoring is one of the important tasks of water environment protection. Remote sensing technology, especially drone remote sensing, is increasingly used in water quality monitoring due to its advantages of wide monitoring area, high data accuracy, strong mobility and low economic cost.

[0003] The main principle of remote sensing water quality monitoring is to estimate the water quality parameter content based on the ability of water to reflect sunlight, that is, reflectivity. Therefore, in the remote sensing water quality monitoring work by drone, it is necessary to place a target with a known reflectivity in the open space of the monitoring area in advance, and obtain the radiance signal of the target based on the sensor carried by the drone to estimate the solar irradiance.

[0004] However, due to the influence of factors such as clouds and solar altitude angle, the solar irradiance will change during the entire UAV flight. Therefore, it is necessary to dynamically place targets during the flight of the UAV to complete the calculation of the solar irradiance at different time periods during the flight of the UAV. In addition, since the monitored object is a water body, the target should be designed to be easy to accompany the UAV, waterproof, and wave-proof, but the existing radiation calibration board is still in the most primitive cloth flexible material or hard plate structure, which cannot support mobile layout. And because the UAV monitoring range is large, some areas are difficult to enter by car, and radiation calibration of the entire monitoring range cannot be achieved. The lack of radiation calibration work has caused the reflectivity obtained by the UAV sensor to be seriously affected by light and cloud cover at different times, and the quality of water quality remote sensing monitoring results has been seriously disturbed.

[0005] Therefore, it is very necessary to invent a target device for UAV water quality remote sensing monitoring. Summary of the invention

[0006] In order to solve the above-mentioned technical problems, the present invention provides a target device for remote sensing monitoring of water quality by unmanned aerial vehicles, wherein the present invention is implemented by the following technical solutions:

[0007] A target device for remote sensing monitoring of water quality by unmanned aerial vehicle comprises an unmanned aerial vehicle body, mounting rods are threadedly connected to the four corners of the bottom of the unmanned aerial vehicle body, and an automatic delivery mark is installed at the lower part of each mounting rod. The automatic delivery mark is composed of a disassembly assembly component and an umbrella-shaped folding assembly, and a paper tape is arranged outside the umbrella-shaped folding assembly, and a shrinking assembly is arranged inside the umbrella-shaped folding assembly.

[0008] Preferably, the disassembly and assembly component includes a protective sleeve, a fixing cover with a hole is threadedly connected to the upper end of the protective sleeve, and a connecting inner tube is threadedly connected to the hole inside the fixing cover with a hole, and an electric attraction magnet block is screwed to the lower end of the connecting inner tube, and a disassembly tube is threadedly connected to the upper end of the connecting inner tube, and disassembly bolts are threadedly connected to the middle parts of the left and right sides of the disassembly tube.

[0009] Preferably, the protective sleeve is made of an aluminum alloy tube, and the disassembly tube is sleeved on the lower outer wall of the installation rod, and the connection between the disassembly tube and the installation rod is fastened by disassembly bolts.

[0010] Preferably, the umbrella-shaped folding assembly includes a shrinkable tube, movable seats are welded to the middle parts around the outer side of the shrinkable tube, and a shrinkable rod is axially connected inside each movable seat, and a reflective surface support rod is axially connected to the lower end of each shrinkable rod, and a mounting circular hole is opened in the middle part of the lower side of each reflective surface support rod, and a floating ball is screwed to the lower side of the outer end of each reflective surface support rod.

[0011] Preferably, an extendable push tube is movably inserted inside the retractable tube, a telescopic spring is sleeved on the outer wall of the upper part of the extendable push tube, an open ring is sleeved inside the annular groove opened on the outer wall of the upper end of the extendable push tube, and an umbrella cloth is screwed on the outer surface between the reflective surface support rods.

[0012] Preferably, the telescopic spring is a cylindrical stainless steel spring and is located between the shrink tube and the open ring.

[0013] Preferably, the lower portion of the protective sleeve is sleeved on the outer upper side of the shrink tube.

[0014] Preferably, a hole is provided in the middle of the reflective surface arranged on the upper surface of the umbrella cloth, and a reflective resin film layer is arranged on the concave surface of the umbrella cloth, and a hydrophobic polyvinyl chloride composite film layer is arranged on the inner surface of the umbrella cloth.

[0015] Preferably, the floating ball is a foam ball.

[0016] Preferably, the retractable rod is made of a plurality of aluminum alloy plates or a plurality of stainless steel thin plates.

[0017] Preferably, the shrinkage assembly includes a shrinkage rod, a limiting ring is arranged inside an annular groove opened in the outer wall of the upper end of the shrinkage rod, a retaining ring is sleeved inside an annular groove opened in the middle and lower part of the outer wall of the shrinkage rod, and an I-beam frame is threadedly connected to the lower end of the shrinkage rod.

[0018] Preferably, the front and rear parts on the left side and the front and rear parts on the right side of the I-beam frame are both provided with slide grooves, and a slide shaft is provided on the inner side between the slide grooves on the left part, and a slide shaft is provided on the inner side between the slide grooves on the right part.

[0019] Preferably, the I-shaped frame is hollowed out.

[0020] Preferably, the retractable pull rod is inserted into the extension push tube, and the outer wall of the retractable pull rod may be sleeved with a telescopic spring, and the telescopic spring is arranged between the limit ring and the upper end of the extension push tube.

[0021] Preferably, the limit ring and the retaining ring are arranged at the upper and lower ends of the extension push tube.

[0022] Preferably, the lower ends of the reflective surface support rods are arranged on the left and right sides of the I-shaped frame, and the sliding shaft is inserted into the mounting circular hole, and retaining rings are arranged inside the annular grooves formed on the outer walls at the front and rear ends of the sliding shaft.

[0023] Preferably, after the reflective surface support rod drives the umbrella cloth to unfold, the outer circle of the umbrella cloth is higher than the central part of the umbrella cloth.

[0024] Compared with the prior art, the target device for remote sensing monitoring of water quality by drone provided by the present invention has the following beneficial effects:

[0025] 1. The umbrella-shaped folding component in the automatic delivery mark of the present invention can be carried and delivered by the drone body through an umbrella-shaped folding method. During the delivery process, since the drone body has an initial velocity, the umbrella-shaped folding component can ensure rapid descent and will not deviate too far from the drone body, ensuring that the calibration point can be present in the image of the drone body at any time.

[0026] 2. The vertical area of ​​the umbrella-shaped folding assembly of the present invention is relatively small, and the drone body can be carried in multiple pieces, which can adapt to the remote sensing range of the entire route of the drone body.

[0027] 3. The drone body of the present invention does not need to be operated in rain. After the device is folded, it is fixed with a paper tape and can be automatically untied after entering the water, thus reducing the number of mechanical devices.

[0028] 4. The retractable rod, the reflective surface support rod, the floating ball, the extension push tube and the telescopic spring of the present invention are supported by the telescopic spring to achieve automatic opening after entering the water, while ensuring that the concave surface of the umbrella cloth, i.e. the reflective surface, is slightly higher than the water surface to prevent the influence of the reflecting surface support rod on the jumping waves.

[0029] 5. There is an opening in the middle of the reflective surface arranged on the upper surface of the umbrella cloth of the present invention, and under the action of the floating balls around, during the opening process, the surrounding areas are higher than the middle, and the water can flow away through the middle opening, preventing the presence of water from affecting the reflection calibration.

[0030] 6. The opening in the middle of the umbrella cloth of the present invention only allows the middle retracting rod to pass through, thereby ensuring the effective area ratio of the reflective surface of the umbrella cloth.

[0031] 7. The present invention adopts the magnetic connection mode of the electric magnet block and the upper buckle to prevent the paper tape from getting wet, and can be released quickly to ensure the safety of the drone body.

[0032] 8. The automatic dropping tag of the present invention is hung under the drone body and is folded up like an umbrella when mounted; the periphery is fixed and folded with paper tape; the concave surface of the umbrella-shaped umbrella cloth is a reflective resin film layer, and the outer circle of the umbrella ring is a floating ball, which supports the edge of the umbrella so that it has a certain height from the water surface; the inner surface of the umbrella-shaped umbrella cloth adopts an isotropic hydrophobic polyvinyl chloride composite film layer, and the umbrella-shaped reflective surface support rod maintains a certain inclination after being unfolded; the middle of the umbrella-shaped reflective surface support rod is an expansion and contraction component, and maintains a certain weight; and the I-shaped frame in the middle is a hollow design to allow water to drain.

[0033] 9. The folded state of the automatic drop tag of the present invention is an umbrella, and the umbrella is ensured to fall straight down by the umbrella-shaped folding assembly, paper tape and contraction assembly; when it falls to the water surface, the center of gravity ensures that the paper tape is immersed in the water, and then the paper tape is broken, and the umbrella-shaped folding assembly is opened by the contraction assembly, so that the umbrella cloth forms an umbrella cover; excess water on the umbrella cover is discharged into the water through the central opening of the umbrella cloth; the umbrella cover is opened to realize the reflectivity calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of a target device for remote sensing monitoring of water quality by an unmanned aerial vehicle provided by the present invention.

[0035] Figure 2 The present invention provides Figure 1 Schematic diagram of the structure in which the disassembly and assembly components and the umbrella-shaped folding components are coordinated for storage.

[0036] Figure 3 The present invention provides Figure 1 Schematic diagram of the top view of the unfolded plan structure of the umbrella-shaped folding component.

[0037] Figure 4 The present invention provides Figure 2 Schematic diagram of the connection and installation structure of the shrinkage components in the figure.

[0038] Figure 5 The present invention provides Figure 3 Schematic diagram of the structure of the disassembled components.

[0039] Figure 6 The present invention provides Figure 3 Schematic diagram of the structure of the umbrella-shaped folding component.

[0040] Figure 7 The present invention provides Figure 3 Schematic diagram of the structure of the contraction component in .

[0041] Figure 8 The present invention provides Figure 3 Schematic diagram of the unfolded structure of the umbrella-shaped folding component and the retracting component.

[0042] In the figure:

[0043] 1. Drone body; 2. Mounting rod; 3. Automatic label placement; 4. Disassembly and assembly components; 5. Umbrella-shaped folding components; 6. Paper tape; 7. Contraction components; 8. Protective sleeve; 9. Fixed cover with holes; 10. Connecting inner tube; 11. Electric magnet block; 12. Disassembly tube; 13. Disassembly and assembly bolts; 14. Contraction tube; 15. Moving seat; 16. Contraction rod; 17. Reflective surface support rod; 18. Mounting round hole; 19. Floating ball; 20. Extension push tube; 21. Telescopic spring; 22. Open ring; 23. Umbrella cloth; 24. Contraction pull rod; 25. Limit ring; 26. Retaining ring; 27. I-beam frame; 28. Slide groove; 29. ​​Sliding shaft; 30. Reflective surface. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings. Figure 1 , Attachment Figure 2 and attached Figure 4 As shown, a target device for remote sensing monitoring of water quality by unmanned aerial vehicle comprises an unmanned aerial vehicle body 1, four corners of the bottom of the unmanned aerial vehicle body 1 are threadedly connected with mounting rods 2, and an automatic delivery mark 3 is installed at the lower part of each mounting rod 2, a group of four automatic delivery marks 3 are hung below the unmanned aerial vehicle body 1, and because the remote sensing lens adopts orthophoto image acquisition, it can be placed to avoid the lens field of view, thereby ensuring the monitoring effect, and the automatic delivery mark 3 is composed of a disassembly assembly component 4 and an umbrella-shaped folding component 5, and the umbrella-shaped folding component 5 is provided with a paper tape 6 on the outside, and a shrinking component 7 is provided inside the umbrella-shaped folding component 5, and the automatic delivery mark 3 is automatically delivered to the unmanned aerial vehicle body 1. The umbrella-shaped folding component 5 in the delivery mark 3 can realize the carrying and follow-up delivery of the drone body 1 through an umbrella-shaped folding method. Since the drone body 1 has an initial velocity during the delivery process, the umbrella-shaped folding component 5 can ensure rapid descent and will not deviate too far from the drone body 1, ensuring that the calibration point can exist in the image of the drone body 1 at any time; and the vertical area of ​​the umbrella-shaped folding component 5 is small, and the drone body 1 can be carried in multiples, which can adapt to the remote sensing range of the entire route of the drone body 1; the drone body 1 does not need to operate in rain, and the device is fixed with a paper tape 6 after being folded, which can be automatically untied after entering the water, reducing mechanical devices.

[0045] In this embodiment, combined with the Figure 5As shown, the disassembly assembly 4 includes a protective sleeve 8, a fixing cover 9 with a hole is threadedly connected to the upper end of the protective sleeve 8, and a connecting inner tube 10 is threadedly connected to the hole inside the fixing cover 9 with a hole, which is convenient for disassembly and installation, and convenient for operation, and an electric suction magnet block 11 is screwed to the lower end of the connecting inner tube 10, and a disassembly tube 12 is threadedly connected to the upper end of the connecting inner tube 10, and disassembly bolts 13 are threadedly connected to the middle parts of the left and right sides of the disassembly tube 12, which are sleeved on the lower outer wall of the installation rod 2 through the disassembly tube 12, and then fastened by the disassembly bolts 13, which can be quickly disassembled or installed, and the electric suction magnet block 11 is magnetically connected to the upper part of the open ring 22; when the light rain wets the paper tape 6, it can be quickly released at the same time to ensure the safety of the drone body 1;

[0046] The protective sleeve 8 is made of an aluminum alloy tube to reduce weight, and the disassembly tube 12 is sleeved on the lower outer wall of the installation rod 2, and the connection between the disassembly tube 12 and the installation rod 2 is fastened by a disassembly bolt 13 to ensure quick connection, installation or disassembly.

[0047] In this embodiment, combined with the Figure 6As shown, the umbrella-type folding component 5 includes a shrinkable tube 14, and movable seats 15 are welded in four directions on the middle part of the outer side of the shrinkable tube 14, and a shrinking rod 16 is axially connected inside each movable seat 15, and a reflecting surface support rod 17 is axially connected at the lower end of each shrinking rod 16, and a mounting circular hole 18 is opened in the middle part of the lower side of each reflecting surface support rod 17, and a floating ball 19 is screwed to the lower side of the outer end of each reflecting surface support rod 17 to improve the floating effect, and an extension push tube 20 is movably inserted inside the shrinkable tube 14, and a telescopic spring 21 is sleeved on the outer wall of the upper part of the extension push tube 20, and an open ring 22 is sleeved inside the annular groove opened on the outer wall of the upper end of the extension push tube 20, and an umbrella cloth 23 is screwed on the outer surface between the reflecting surface support rods 17, and the telescopic spring 21 adopts a cylindrical stainless steel spring, and is located between the shrinkable tube 14 and the open ring 22, and is supported by the telescopic spring 21 to achieve automatic opening after entering the water. At the same time, it is ensured that the concave surface of the umbrella-shaped umbrella cloth 23, that is, the reflective surface 30, is slightly higher than the water surface to prevent the influence of the jumping waves on the reflective surface support rod 17. The lower part of the protective sleeve 8 is sleeved on the upper side of the shrink tube 14. The reflective surface 30 set on the upper surface of the umbrella cloth 23 is provided with an opening in the middle, and the concave surface of the umbrella cloth 23 is provided with a quick-drying diffuse reflective reflective resin film layer, and the inner surface of the umbrella cloth 23 is provided with a hydrophobic polyvinyl chloride composite film layer. The floating ball 19 adopts a foam ball to ensure the floating effect and avoid sinking, thereby ensuring the calibration effect. The shrink rod 16 adopts a stainless steel square rod to reduce the weight. When the umbrella cloth 23 is folded and stored into an umbrella shape through the reflective surface support rod 17, it is bound and fixed by the paper tape 6. There is an opening in the middle of the reflective surface 30 of the umbrella cloth 23, and it is affected by the floating balls 19 around it. During the opening process, the surface is basically flush, but when there are water droplets, it is affected by the gravity of the water droplets. The surrounding is slightly higher than the middle, and the water flow can flow away through the middle opening to prevent the presence of water from affecting the reflectivity calibration.

[0048] In this embodiment, combined with the Figure 7As shown, the contraction assembly 7 includes a contraction rod 24, a limiting ring 25 is arranged inside the annular groove opened on the outer wall of the upper end of the contraction rod 24, and a retaining ring 26 is sleeved inside the annular groove opened on the middle and lower part of the outer wall of the contraction rod 24, and an I-shaped frame 27 is threadedly connected to the lower end of the contraction rod 24, and the front and rear parts of the left side of the I-shaped frame 27 and the front and rear parts of the right side are provided with sliding grooves 28, and a sliding shaft 29 is arranged inside the sliding grooves 28 of the left part, and a sliding shaft 29 is arranged inside the sliding grooves 28 of the right part, the I-shaped frame 27 is hollowed out, and the contraction rod 24 is inserted in the extension Inside the push tube 20, and the outer wall of the retracting pull rod 24 can also be sleeved with a telescopic spring 21, and the telescopic spring 21 is arranged between the limit ring 25 and the upper end of the extension push tube 20, the limit ring 25 and the retaining ring 26 are arranged at the upper and lower ends of the extension push tube 20, the lower end of the reflective surface support rod 17 is arranged on the left and right sides of the I-shaped frame 27, and the sliding shaft 29 is inserted into the installation circular hole 18, and a retaining ring is arranged inside the annular groove opened on the outer wall at the front and rear ends of the sliding shaft 29, and the opening set in the middle part of the umbrella cloth 23 only allows the middle retracting pull rod 24 to pass through, so as to ensure the effective area ratio of the reflective surface 30 of the umbrella cloth 23;

[0049] The electric magnet block 11 is separated from the retractable rod 24, and the device enters the water. The paper tape 6 is wet and cracked, and the reflective surface support rod 17 disappears due to radial constraints, so that the telescopic spring 21 on the outer wall of the retractable rod 24 releases energy and drives the retractable rod 24 to move upward inside the extension push tube 20. At the same time, the telescopic spring 21 releases energy and drives the retractable tube 14 to move downward on the outer wall of the extension push tube 20, and the retractable rod 16 inside the moving seat 15 drives the reflective surface support rod 17 to drive the umbrella cloth 23 to unfold into an umbrella shape.

[0050] In this embodiment, combined with the Figure 3 and attached Figure 8 As shown, after the reflective surface support rod 17 drives the umbrella cloth 23 to unfold, the outer circle of the umbrella cloth 23 is higher than the center of the umbrella cloth 23, and there is an opening in the middle of the reflective surface 30 of the umbrella cloth 23, and under the action of the floating balls 19 around, during the opening process, the surroundings are higher than the middle, and the water will automatically flow away through the middle opening to prevent the presence of water from affecting the reflectivity calibration.

[0051] The working process of the present invention is as follows: the reflective surface support rod 17 adopts an umbrella support shape and is foldable and retractable; a group of four automatic delivery tags 3 are hung under the drone body 1, and because the remote sensing lens adopts orthographic image acquisition, the placement is considered to avoid the lens field of view to ensure the monitoring effect; the automatic delivery tag 3 is hung under the drone body 1 and is gathered like an umbrella when mounted; the periphery is gathered and fixed with a paper tape 6; the concave surface of the umbrella-shaped umbrella cloth 23 is a reflective resin film layer, and the outer circle of the umbrella ring is a floating ball 19, and the floating ball 19 supports the umbrella edge so that it has a certain height from the water surface; the inner surface of the umbrella-shaped umbrella cloth 23 adopts a hydrophobic polyvinyl chloride composite film layer, and the umbrella-shaped reflective surface support rod 17 maintains a certain inclination after being unfolded; the middle of the umbrella-shaped reflective surface support rod 17 is opened and retracted The retractable component 7 is provided, and a certain weight is maintained; and the I-shaped frame 27 in the middle is hollowed out to allow water to be discharged; the retractable pull rod 24 is connected to the electric magnet block 11 by electromagnetic force. After power failure, the automatic delivery mark 3 descends. During the lowering process of the automatic delivery mark 3, the disassembly and assembly component 4 is retained on the drone body 1, and only the automatic delivery mark 3 falls vertically; the automatic delivery mark 3 is an umbrella in the folded state, and the umbrella is ensured to fall straightly by the umbrella-shaped folding component 5, the paper tape 6 and the retractable component 7; when it falls to the water surface, the center of gravity ensures that the paper tape 6 is immersed in the water, and then the paper tape 6 is broken, and the umbrella-shaped folding component 5 is opened by the retractable component 7, so that the umbrella cloth 23 forms an umbrella surface; excess water on the umbrella surface is discharged into the water through the central opening of the umbrella cloth 23; the umbrella surface is opened to realize the reflectivity calibration.

[0052] Utilizing the technical solution described in the present invention, or those skilled in the art designing a similar technical solution inspired by the technical solution of the present invention to achieve the above-mentioned technical effects, all fall within the protection scope of the present invention.

Claims

1. A target device for remote sensing monitoring of water quality by an unmanned aerial vehicle, comprising an unmanned aerial vehicle body (1), characterized in that: The four corners of the bottom of the drone body (1) are all threadedly connected with mounting rods (2), and an automatic delivery mark (3) is installed at the bottom of each mounting rod (2), and the automatic delivery mark (3) is composed of a disassembly assembly (4) and an umbrella-shaped folding assembly (5), and a paper tape (6) is arranged outside the umbrella-shaped folding assembly (5), and a shrinking assembly (7) is arranged inside the umbrella-shaped folding assembly (5). The disassembly assembly (4) includes a protective sleeve (8), a fixing cover (9) with a hole is threadedly connected to the upper end of the protective sleeve (8), and a connecting inner tube (10) is threadedly connected in the hole inside the fixing cover (9), and an electric magnet block (11) is screwed to the lower end of the connecting inner tube (10), and a disassembly tube (12) is threadedly connected to the upper end of the connecting inner tube (10), and disassembly bolts (13) are threadedly connected to the middle part of the left and right sides of the disassembly tube (12), and the protective sleeve (8) is made of an aluminum alloy tube, and the disassembly tube (12) is sleeved on the lower outer wall of the installation rod (2), and is fastened and connected by a disassembly bolt (13) at the connection between the disassembly tube (12) and the installation rod (2), the lower part of the protective sleeve (8) is sleeved on the upper side of the outside of the shrink tube (14), and the umbrella-shaped folding component (5) includes a shrink tube (14), and a movable seat (15) is welded to the middle part of the outer side of the shrink tube (14), and a shrink rod (16) is axially connected inside each movable seat (15), and a reflective surface support rod (17) is axially connected to the lower end of each shrink rod (16), and a mounting circular hole (18) is opened in the middle part of the lower side of each reflective surface support rod (17), and a floating ball (19) is screwed to the lower side of the outer end of each reflective surface support rod (17), and the floating ball (19) is made of a foam ball, and the shrink rod (16) is made of a stainless steel square rod.

2. The target device for remote sensing monitoring of water quality by unmanned aerial vehicle according to claim 1, characterized in that: The retractable tube (14) is movably inserted with an extendable push tube (20), and a telescopic spring (21) is sleeved on the outer wall of the upper part of the extendable push tube (20), and an open ring (22) is sleeved inside an annular groove formed on the outer wall of the upper end of the extendable push tube (20), and an umbrella cloth (23) is screwed to the outer surface between the reflective surface support rods (17).

3. The target device for remote sensing monitoring of water quality by unmanned aerial vehicle according to claim 2, characterized in that: The telescopic spring (21) is a cylindrical stainless steel spring and is located between the shrink tube (14) and the open ring (22).

4. The target device for remote sensing monitoring of water quality by unmanned aerial vehicle according to claim 2, characterized in that: The reflective surface (30) provided on the upper surface of the umbrella cloth (23) has an opening in the middle, the concave surface of the umbrella cloth (23) is provided with a reflective resin film layer, and the inner surface of the umbrella cloth (23) is provided with a hydrophobic polyvinyl chloride composite film layer.

5. The target device for remote sensing monitoring of water quality by unmanned aerial vehicle according to claim 1, characterized in that: The retracting assembly (7) comprises a retracting rod (24), a limiting ring (25) is arranged inside an annular groove opened in the outer wall of the upper end of the retracting rod (24), a retaining ring (26) is sleeved inside an annular groove opened in the middle and lower part of the outer wall of the retracting rod (24), and an I-shaped frame (27) is threadedly connected to the lower end of the retracting rod (24).

6. The target device for remote sensing monitoring of water quality by unmanned aerial vehicle according to claim 5, characterized in that: The front and rear parts on the left side and the front and rear parts on the right side of the I-shaped frame (27) are both provided with slide grooves (28), and a slide shaft (29) is provided on the inner side between the slide grooves (28) on the left side, and a slide shaft (29) is provided on the inner side between the slide grooves (28) on the right side.

7. The target device for remote sensing monitoring of water quality by unmanned aerial vehicle according to claim 5, characterized in that: The I-shaped frame (27) is hollowed out, the retractable pull rod (24) is inserted into the extension push tube (20), and the outer wall of the retractable pull rod (24) can also be sleeved with a telescopic spring (21), and the telescopic spring (21) is arranged between the limit ring (25) and the upper end of the extension push tube (20).

8. The target device for remote sensing monitoring of water quality by unmanned aerial vehicle according to claim 5, characterized in that: The limiting ring (25) and the retaining ring (26) are arranged at the upper and lower ends of the extension push tube (20).

9. The target device for remote sensing monitoring of water quality by unmanned aerial vehicle according to claim 2, characterized in that: The lower ends of the reflective surface support rods (17) are arranged on the left and right sides of the I-shaped frame (27), and the sliding shaft (29) is inserted into the mounting circular hole (18), and retaining rings are arranged inside the annular grooves formed on the outer walls at the front and rear ends of the sliding shaft (29). After the reflective surface support rods (17) drive the umbrella cloth (23) to unfold, the outer ring of the umbrella cloth (23) is higher than the center of the umbrella cloth (23).

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