Frost prevention fan system and blowing method

Abstract

To provide a frost prevention fan system and a blowing method capable of performing properly frost prevention in a farm field.SOLUTION: A frost prevention fan system 1 comprises: a frost prevention fan 10 for sending air to a farm field; a drone 200 which has a temperature sensor for measuring at least an air temperature, and flies autonomously; and a control unit 100 for controlling the drone 200 and the frost prevention fan 10. The drone 200 flies over the farm field and measures the air temperature over the farm field, and sends temperature data indicating the measured air temperature to the control unit 100. The control unit 100 controls air sending of air from the frost prevention fan 10 on the basis of the temperature data.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a frost-proof fan system and a method for blowing air. [Background technology]

[0002] In farm fields, anti-frost fans are used to protect crops from frost damage by blowing air from the inversion layer above the field onto the crops.

[0003] Patent Document 1 discloses an anti-frost system that uses an unmanned aerial vehicle such as a drone to protect entire agricultural crops from frost. This anti-frost system includes a management server that performs flight control of the drone, and a drone that performs flight to protect agricultural crops such as tea fields from frost. The management server acquires weather information from an external source, controls the drone based on this weather information, and protects agricultural crops from frost using airflow generated when the drone is operated, particularly in tea fields. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-000015 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the frost prevention system described in Patent Document 1, frost prevention is performed by utilizing the air current generated when a drone is operated based on weather information obtained from outside. If the weather information obtained from outside does not include the temperature above the field and the temperature near the ground, it is unclear whether an inversion layer exists above the field, making it difficult to perform appropriate frost prevention.

[0006] The present invention has been made in light of the above-mentioned circumstances, and an object of the present invention is to provide an anti-frost fan system and an air blowing method that appropriately protect a farm field from frost. [Means for solving the problem]

[0007] In order to achieve the above object, the frost-proof fan system according to the present invention comprises: A frost prevention fan that blows air into the field, An autonomous drone equipped with a temperature sensor that measures at least the air temperature; A control device for controlling the drone and the anti-frost fan, The drone measures an air temperature above the field while flying above the field, and transmits temperature data indicating the measured air temperature to the control device; The control device controls the airflow of the frost prevention fan based on the temperature data. It is characterized by:

[0008] The drone may further include a position sensor that detects the position of the drone itself, and may transmit the temperature data indicating the air temperature measured while flying a flight path set above the field, together with position data indicating the position where the air temperature was measured, to the control device.

[0009] The drone measures air temperature at a plurality of measurement points at different heights above the field, and transmits temperature data indicating the air temperature measured at each of the measurement points together with the position data indicating the position at which the air temperature was measured to the control device; When the control device determines that an inversion layer exists above the field based on the air temperatures measured at a plurality of the measurement points, it may operate the anti-frost fan.

[0010] At least one of the measurement points is at a first height that is less than or equal to one-third of the height of the frost prevention fan; At least one of the measurement points may be at a second height that is greater than or equal to two-thirds and less than or equal to four-thirds of the height of the frost prevention fan.

[0011] the first height is a height near the ground; The second height may be the same height as the anti-frost fan.

[0012] A plurality of the measurement points are set at the first height, The control device may create temperature distribution data indicating the temperature distribution at the first height, identify a low-temperature area at the first height, and adjust the blowing direction of the frost prevention fan so as to blow air to the identified low-temperature area.

[0013] When the difference in temperature between the temperature measured at the second height and the temperature measured at the first height is equal to or greater than a reference value, the control device may determine that an inversion layer exists and operate the anti-frost fan.

[0014] When the air temperature measured at the lowest measuring point is equal to or higher than a reference temperature, the control device may determine that there is no risk of frost and stop the anti-frost fan.

[0015] The control device may receive wind speed data indicating a wind speed in the field, and when it determines that the wind speed is equal to or greater than a reference wind speed, may stop the anti-frost fan.

[0016] The frost prevention fan includes a first frost prevention fan that blows air to a first air blowing area and a second frost prevention fan that blows air to a second air blowing area, The drone flies over the first air blowing area and the second air blowing area at a plurality of heights, and measures temperatures in the first air blowing area and the second air blowing area at a plurality of heights; The control device may identify an area where an inversion layer is formed based on temperature data indicating the temperature measured by the drone, and operate the first anti-frost fan or the second anti-frost fan so as to blow air to the area between the first air blowing area and the second air blowing area where an inversion layer is formed.

[0017] In order to achieve the above object, a blowing method according to the present invention includes: A frost prevention fan that blows air into the field, An autonomous drone equipped with a temperature sensor that measures at least the air temperature; A method for blowing air using an anti-frost fan system including the drone and a control device for controlling the anti-frost fan, Using the drone, while flying above the field, measure the air temperature above the field, and transmit temperature data indicating the measured air temperature to a control device; The control device controls the airflow of the anti-frost fan based on the temperature data. It is characterized by: Effect of the Invention

[0018] According to the present invention, it is possible to provide an anti-frost fan system and a blowing method that appropriately protect a farm field from frost. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a diagram showing an anti-frost system according to an embodiment. [Diagram 2] FIG. 1 is a diagram showing a drone according to an embodiment. [Diagram 3] FIG. 1 is a block diagram showing a drone according to an embodiment. [Figure 4] FIG. 2 is a diagram showing a flight path of a drone according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a diagram showing the flying height of a drone according to an embodiment. [Figure 6] FIG. 2 is a block diagram showing a control device according to the embodiment. [Figure 7] FIG. 13(A) is a diagram showing a measured temperature DB according to the embodiment, and FIG. 13(B) is a diagram showing a temperature distribution DB. [Figure 8] 5 is a flowchart showing a temperature distribution measurement process according to the embodiment. [Figure 9] 5 is a flowchart showing an air blowing process according to the embodiment. [Figure 10] FIG. 13 is a diagram showing an antifrost system according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a frost-proof fan system and a blowing method according to an embodiment of the present invention will be described with reference to the drawings.

[0021] As shown in Fig. 1, the anti-frost fan system 1 according to this embodiment is used to perform frost prevention in a field to prevent damage to a crop R. The anti-frost fan system 1 includes an anti-frost fan 10 that blows air into the field, an anemometer 30 that measures the wind speed in the field, an autonomously flying drone 200, and a control device 100 that controls the anti-frost fan 10 and the drone 200. The field is, for example, a tea field, and the crop R is, for example, tea.

[0022] The anti-frost fan 10 is disposed on a support 11 erected in a farm field, and includes a fan 12. The fan 12 is rotated by a motor (not shown). The fan 12 can blow air over the entire farm field by oscillating with an oscillating unit (not shown). The air volume of the anti-frost fan 10 is controlled by the control device 100 via an inverter included in the anti-frost fan 10. The anti-frost fan 10 is disposed at a height of 6 m to 10 m above the ground, for example, at a position 8 m above the ground.

[0023] The anemometer 30 measures the wind speed in the field, and transmits wind speed data indicating the measured wind speed to the control device 100.

[0024] As shown in Fig. 2, the drone 200 includes a propeller 21, a sensor unit 22, and a camera 23. The propeller 21 rotates by a motor (not shown). The camera 23 captures at least one image using visible light or infrared light. The camera 23 is attached to the main body of the drone 200 by an adjustment unit that adjusts the imaging direction. This makes it possible to adjust the imaging direction of the camera 23.

[0025] In addition, the drone 200 further includes, as functional components, a control unit 210, a communication unit 220, a ROM (Read Only Memory) 230, and a RAM (Random Access Memory) 240, as shown in FIG. 3.

[0026] The sensor unit 22 includes a temperature sensor 24 that measures the air temperature and a position sensor 25 that measures the position of the drone 200.

[0027] The temperature sensor 24 measures the air temperature in the vicinity of the drone 200, and includes, for example, a platinum resistance thermometer. The temperature sensor 24 also outputs temperature data indicating the measured temperature to the control unit 210.

[0028] The position sensor 25 measures the position of the drone 200, and measures the position in the height direction shown in FIG. 4, a first direction perpendicular to the height direction, and a second direction perpendicular to the height direction and the first direction. For example, the first direction is the ridge direction, and the second direction is the direction perpendicular to the ridge direction. The position sensor 25 also measures the position of the drone 200 and outputs position data indicating the position to the control unit 210. Specifically, the position sensor 25 includes one or more of a GPS (Global Positioning System) sensor, an acceleration sensor, a gyro sensor, a magnetic orientation sensor, and an ultrasonic sensor. The GPS sensor acquires data indicating the altitude, latitude, and longitude. The acceleration sensor and the gyro sensor measure the moving speed and attitude of the drone 200. The magnetic orientation sensor acquires data indicating the magnetic orientation of the drone 200. The ultrasonic sensor measures the height from the ground to the drone 200.

[0029] The communication unit 220 transmits the temperature data and the position data measured by the temperature sensor 24 and the position sensor 25 to the control device 100. The communication unit 220 also receives data transmitted from the control device 100. The communication unit 220 is configured from a wireless communication module such as a wireless LAN (Local Area Network) or Bluetooth (registered trademark).

[0030] The ROM 230 is made up of a non-volatile memory such as a flash memory, and stores programs for the control unit 210 to realize various functions as described above. The RAM 240 is made up of a volatile memory, and is used as a working area for the control unit 210 to execute programs for performing various processes.

[0031] The control unit 210 is configured with a CPU (Central Processing Unit) etc. The control unit 210 executes a program stored in the ROM 230 to function as a drone control unit 211 and a temperature measurement unit 212.

[0032] The drone control unit 211 controls the motor that rotates the propeller 21 based on the position of the drone 200 measured by the position sensor 25 and flight path data indicating a predetermined flight path or flight path data indicating a flight path transmitted from the control device 100, and causes the drone 200 to fly. As shown in FIG. 4, the drone control unit 211 starts flying the drone 200 from the measurement point D1 along the ridge direction, which is the first direction, and flies to the measurement point DN along the predetermined flight path. Data indicating the measurement points Dn (n=1 to N) is included in the flight path data. Also, as shown in FIG. 5, one or more measurement points Dn (n=1 to N) are set at each of the first height H1, the second height H2, and the third height H3. Preferably, a plurality of measurement points Dn (n=1 to N) are set at the first height H1, the second height H2, or the third height H3. For example, when a plurality of measurement points Dn (n=1 to N) are set at the first height H1, it is possible to measure the temperature distribution at a height near the vicinity of the field. The first height H1 is a height near the ground of the field, and is, for example, one third or less of the height of the frost-proof fan 10, specifically, 1 m or more and 3 m or less. The second height H2 is, for example, two thirds or more and four thirds or less of the height of the frost-proof fan 10, specifically, the same as the height of the frost-proof fan 10, specifically, 6 m or more and 10 m or less. The third height H3 is a height higher than the frost-proof fan 10, and is, for example, more than four thirds of the height of the frost-proof fan 10, specifically, 15 m or more and 20 m or less.

[0033] The temperature measurement unit 212 measures the temperature at measurement points Dn (n=1 to N) using the temperature sensor 24. Temperature data indicating the measured temperature is stored in the RAM 240 together with position data indicating the position of each measurement point Dn (n=1 to N) in the height direction, the first direction, and the second direction. In addition, the temperature measurement unit 112 transmits the temperature data and position data measured by the temperature sensor 24 and the position sensor 25 to the control device 100 via the communication unit 220.

[0034] As shown in FIG. 6, the control device 100 includes a control unit 110, a communication unit 120, a ROM 130, a RAM 140, and a frost prevention fan DB (Data Base) 150.

[0035] The communication unit 120 transmits data for controlling the drone 200, and receives temperature data and position data transmitted from the drone 200. The communication unit 120 is configured from a wireless communication module such as a wireless LAN or Bluetooth (registered trademark).

[0036] The ROM 130 is made up of a non-volatile memory such as a flash memory, and stores programs for implementing various functions of the control unit 110. The RAM 140 is made up of a volatile memory, and is used as a working area for the control unit 110 to execute programs for performing various processes.

[0037] The control unit 110 is configured with a CPU etc. The control unit 110 executes a program stored in the ROM 130 to function as a temperature distribution measuring unit 111 and an anti-frost fan control unit 112.

[0038] The temperature distribution measurement unit 111 receives position data indicating the measurement points Dn (n=1 to N) shown in FIG. 4 and temperature data measured at the measurement points Dn (n=1 to N), which are transmitted from the drone 200. The temperature distribution measurement unit 111 also stores the received position data and temperature data in the measured temperature DB 151. Next, the temperature distribution measurement unit 111 creates temperature distribution data indicating the temperature distribution above the field based on the position data and temperature data stored in the measured temperature DB 151. The created temperature distribution data includes the temperature data measured for each measurement point Dn (n=1 to N), and is stored in the temperature distribution DB 152. Next, the temperature distribution measurement unit 111 receives wind speed data indicating the wind speed in the field measured by the anemometer 30. The data indicating the measured wind speed is stored in the temperature distribution DB 152.

[0039] The antifrost fan control unit 112 controls the antifrost fan 10 based on the temperature distribution data indicating the temperature distribution above the field stored in the temperature distribution DB 152 and the wind speed data indicating the wind speed in the field. First, the antifrost fan control unit 112 judges whether the wind speed in the field measured by the anemometer 30 is less than the reference wind speed. If it is judged that the wind speed in the field measured by the anemometer 30 is equal to or greater than the reference wind speed, the antifrost fan 10 is stopped. If it is judged that the wind speed measured by the anemometer 30 is less than the reference wind speed, the antifrost fan control unit 112 judges whether an inversion layer exists above the field. If the differential temperature is equal to or greater than the reference value, the antifrost fan control unit 112 judges that an inversion layer exists. The differential temperature is a value obtained by subtracting the air temperature measured at the measurement point Dn at the first height H1 from the air temperature measured at the measurement point Dn at the second height H2. The reference value is, for example, 2°C. Specifically, as shown in FIG. 4 and FIG. 5, the frost prevention fan control unit 112 determines that there is an inversion layer above the field when the temperature measured at the measurement point Dn at the second height H2 is higher than the temperature measured at the measurement point Dn at the first height H1 by a reference value or more based on the temperature distribution data stored in the temperature distribution DB 152. For example, when the temperature measured at the measurement point Dn at the first height H1 is 3°C and the temperature measured at the measurement point Dn at the second height H2 is 5°C, the difference in temperature is 2°C and it is determined that there is an inversion layer. When it is determined that there is no inversion layer, the frost prevention fan 10 is stopped. When it is determined that there is an inversion layer, the frost prevention fan control unit 112 determines whether there is a risk of frost. The risk of frost is determined by determining whether the temperature measured at the measurement point Dn at the first height H1 among the temperature data measured by the drone 200 is equal to or lower than a reference temperature, and if it is equal to or lower than the reference temperature, it is determined that there is a risk of frost. The reference temperature is, for example, 5°C. If it is determined that there is no risk of frost, the anti-frost fan control unit 112 stops the anti-frost fan 10. If it is determined that there is a risk of frost, the anti-frost fan control unit 112 operates the anti-frost fan 10.

[0040] The anti-frost fan DB 150 stores data for controlling the anti-frost fan system 1, and includes a measured temperature DB 151 and a temperature distribution DB 152.

[0041] As shown in FIG. 7(A), the measured temperature DB 151 stores a serial number "No.", the "date and time" of measurement, the temperature data measured by the temperature sensor 24, and the position data of the measurement point Dn (1 to N) in association with each other.

[0042] 7(B), the temperature distribution DB152 stores data on the control of the frost prevention fan 10, and stores a serial number "No.", the "date and time" of measurement, temperature distribution data showing the temperature distribution above the field, and data showing the wind speed in the field, in association with each other. The "date and time" stored in the temperature distribution DB152 corresponds to the "date and time" of measurement stored in the measured temperature DB151.

[0043] Next, the temperature distribution measurement process and the air blowing process executed by the frost-proof fan system 1 including the drone 200 and the control device 100 will be described.

[0044] In response to a user's instruction to start the temperature distribution measurement process, or to receiving data indicating an instruction to start the temperature distribution measurement process from the control device 100, the drone 200 starts the temperature distribution measurement process shown in FIG.

[0045] When the temperature distribution measurement process is started, the drone control unit 211 shown in FIG. 3 sets an argument n=1 (step S101).

[0046] Next, the drone control unit 211 controls the drone 200 to fly to the measurement point D1 shown in Fig. 4 (step S102). The position data indicating the measurement point D1 may be stored in the RAM 240 of the drone 200 in advance, or may be transmitted from the control device 100 for each measurement.

[0047] Next, the temperature measurement unit 212 measures the air temperature at the measurement point D1 by the temperature sensor 24 (step S103). The temperature measurement unit 212 also stores in the RAM 240 temperature data indicating the measured air temperature.

[0048] Next, the temperature measurement unit 212 transmits the measured temperature data together with the position data indicating the measurement point D1 to the control device 100 (step S104).

[0049] Next, the drone control unit 211 determines whether the argument n=N (step S105), where N is the total number of measurement points Dn.

[0050] If it is determined that the argument n is not equal to N (step S105; NO), n is incremented (step S106), and steps S102 to S106 are repeated. This allows the temperature measurement unit 212 to transmit temperature data measured at the measurement points Dn (1 to N) to the control device 100 together with position data indicating the measurement points Dn (1 to N). As shown in FIG. 5, one or more measurement points Dn (1 to N) are set at each of a first height H1, a second height H2, and a third height H3. The first height H1 is a height near the ground of the field, and is, for example, one third or less of the height of the frost-proof fan 10. The second height H2 is, for example, two thirds or more and four thirds or less of the height of the frost-proof fan 10, and is specifically the same as the height of the frost-proof fan 10. The third height H3 is a height higher than the frost-proof fan 10, and is, for example, four thirds or more of the height of the frost-proof fan 10.

[0051] If it is determined that the argument n=N (step S105; NO), the temperature distribution measurement process ends. After that, the drone 200 flies to a predetermined position.

[0052] Furthermore, the control device 100 starts the air blowing process shown in FIG. 9 in response to an instruction from a user to start the air blowing process.

[0053] First, the temperature distribution measurement unit 111 receives position data indicating the measurement point Dn (n=1 to N) and temperature data measured at the measurement point Dn (n=1 to N) transmitted from the drone 200 (step S201). In addition, the temperature distribution measurement unit 111 stores the received position data and temperature data in the measured temperature DB 151.

[0054] Next, the temperature distribution measurement unit 111 creates temperature distribution data indicating the temperature distribution above the field (step S202) based on the position data and temperature data stored in the measured temperature DB 151. The created temperature distribution data includes the temperature data measured for each measurement point Dn (n=1 to N), and is stored in the temperature distribution DB 152.

[0055] Next, the temperature distribution measurement unit 111 receives wind speed data indicating the wind speed in the field measured by the anemometer 30 (step S203). The data indicating the measured wind speed is stored in the temperature distribution DB 152.

[0056] Next, the anti-frost fan control unit 112 determines whether or not the wind speed in the field measured by the anemometer 30 is less than a reference wind speed (step S204).

[0057] When it is determined that the wind speed in the field measured by the anemometer 30 is equal to or higher than the reference wind speed (step S204; NO), the frost prevention fan 10 is stopped (step S209). After that, the air blowing process is terminated.

[0058] When it is determined that the wind speed measured by the anemometer 30 is less than the reference wind speed (step S204; YES), the antifrost fan control unit 112 determines whether or not there is an inversion layer above the field (step S205). Specifically, based on the temperature distribution data stored in the temperature distribution DB 152, when the temperature measured at the measurement point Dn at the second height H2, which is higher than the temperature measured at the measurement point Dn at the first height H1, which is lower than the antifrost fan 10, is higher by a reference value or more, the antifrost fan control unit 112 determines that there is an inversion layer above the field. For example, the reference value is 2°C. In this case, when the temperature measured at the measurement point Dn at the first height H1 is 3°C and the temperature measured at the measurement point Dn at the second height H2 is 5°C, the temperature difference is 2°C and it is determined that there is an inversion layer.

[0059] If it is determined that there is no inversion layer (step S205; NO), the frost prevention fan 10 is stopped (step S209). After that, the air blowing process is terminated.

[0060] When it is determined that an inversion layer exists (step S205; YES), the anti-frost fan control unit 112 determines whether there is a risk of frost (step S206). The risk of frost is determined by determining whether the air temperature measured at the measurement point Dn at the first height H1, among the temperature data measured by the drone 200, is equal to or lower than a reference temperature, and if it is equal to or lower than the reference temperature, it is determined that there is a risk of frost. The reference temperature is, for example, 5°C.

[0061] If it is determined that there is no risk of frost (step S206; NO), the frost prevention fan 10 is stopped (step S209). After that, the air blowing process is stopped.

[0062] If it is determined that there is a risk of frost (step S206; YES), the anti-frost fan control unit 112 operates the anti-frost fan 10 (step S207).

[0063] Next, the temperature distribution measurement unit 111 causes the drone 200 to remeasure the air temperature above the field (step S208). The remeasurement is performed after a reference period has elapsed since the previous measurement. The temperature distribution measurement unit 111 transmits data indicating an instruction to the drone 200 to start a temperature distribution measurement process via the communication unit 120. When the drone 200 receives the data indicating an instruction to start a temperature distribution measurement process transmitted from the control device 100, it performs the temperature distribution measurement process again. Thereafter, steps S201 to S208 are repeated.

[0064] As described above, according to the frost prevention fan system 1 of the present embodiment, the control device 100 can determine whether or not an inversion layer has formed above the field by measuring the temperature distribution above the field using the drone 200. When an inversion layer has formed above the field, the control device 100 can operate the frost prevention fan 10. This allows the field to be appropriately protected from frost damage to agricultural crops in the field.

[0065] (Modification) In the above-described embodiment of the frost-proof fan system 1, an example has been described in which the frost-proof fan 10 is operated when an inversion layer is formed above the field. The control device 100 may create temperature distribution data showing the temperature distribution at the first height H1 based on temperature data measured by the temperature sensor 24 at a plurality of measurement points Dn (n=1 to N) set at the first height H1, identify a low-temperature area at the first height H1, and adjust the airflow direction of the frost-proof fan 10 so as to blow air to the identified low-temperature area. In this way, it is possible to blow air to an area where frost is likely to occur. In this case, the frost-proof fan 10 includes a depression angle adjustment unit that adjusts the depression angle of the airflow direction, and a horizontal angle adjustment unit that adjusts the horizontal angle of the airflow direction. The adjustment of the airflow direction is achieved by the control device 100 controlling the depression angle adjustment unit and the horizontal angle adjustment unit of the frost-proof fan 10. In this case, the frost-proof fan 10 is controlled by the control device 100, and can focus on blowing air to a low-temperature part of the field. In addition, the anti-frost fan 10 may focus on the parts of the field where the temperature is low, while the fan 12 may be swung and multiple anti-frost fans 10 may be used to blow air to the entire field other than the parts where the temperature is low.

[0066] In the above embodiment, the frost-proof fan system 1 has been described as an example having one frost-proof fan 10, but the frost-proof fan system 1 may have multiple frost-proof fans 10 as shown in Fig. 10. In this example, the frost-proof fan system 1 has a first frost-proof fan 10A that blows air to the first air-blowing area A1, a second frost-proof fan 10B that blows air to the second air-blowing area A2, and a third frost-proof fan 10C that blows air to the third air-blowing area A3. The drone 200 flies from the first air-blowing area A1 to the third air-blowing area A3 at multiple heights, and measures the temperatures of the first air-blowing area A1 to the third air-blowing area A3 at the first height H1 and the second height H2, respectively. The control device 100 identifies the area where the inversion layer is formed based on the temperature data indicating the temperature measured by the drone 200, and operates the first to third anti-frost fans 10A to 10C so as to blow air to the area where the inversion layer is formed among the first to third air blowing areas A1 to A3. This makes it possible to prevent frost damage to agricultural crops in the fields B1 to B3 in the first to third air blowing areas A1 to A3 to which air is blown by the first to third anti-frost fans 10A to 10C. In this way, one drone 200 can measure the temperature above the field to control multiple anti-frost fans 10. As a result, even if multiple anti-frost fans 10 are used, the control device 100 can efficiently determine whether or not there is an inversion layer above the field in each of the first to third air blowing areas A1 to A3, and can operate the anti-frost fans 10A to 10C in the air blowing areas A1 to A3 where an inversion layer is generated.

[0067] In addition, the core part of the temperature distribution measurement process and the air blowing process executed by the control device 100 and the drone 200, which are composed of a CPU, RAM, ROM, etc., can be executed using a normal information mobile terminal (smartphone, tablet PC), personal computer, etc., without using a dedicated system. For example, a computer program for executing the above-mentioned operations may be stored and distributed on a computer-readable recording medium (flexible disk, CD-ROM (Compact Disc Read Only Memory), DVD-ROM (Digital Versatile Disc Read Only Memory), etc.), and the information terminal that executes the above-mentioned processes may be configured by installing this computer program on an information mobile terminal, etc. In addition, the information processing device may be configured by storing this computer program in a storage device of a server device on a communication network such as the Internet, and downloading it to a normal information processing terminal, etc.

[0068] In addition, when the functions of the temperature distribution measurement processing and the air blowing processing are realized by sharing the functions between an OS (Operating System) and an application program, or by cooperation between the OS and an application program, only the application program portion may be stored in a recording medium or storage device.

[0069] It is also possible to superimpose the computer program on a carrier wave and distribute it via a communication network. For example, the computer program may be posted on a bulletin board (BBS: Bulletin Board System) on the communication network and distributed via the network. The computer program may then be started and executed under the control of the OS in the same way as other application programs, thereby enabling the above-mentioned processing to be performed.

[0070] Although the above describes a preferred embodiment of the present invention, the present invention is not limited to the specific embodiment, and the present invention includes the invention described in the claims and its equivalents. [Explanation of symbols]

[0071] 1. Frost prevention fan system 10…Frost prevention fan 10A…First anti-frost fan 10B…Second anti-frost fan 10C…Third anti-frost fan 11...Strut 12. Fan 21…Propeller 22…Sensor section 23…Camera 24...Temperature sensor 25...Position sensor 30…Anemometer 100...Control device 110, 210...Control unit 120, 220…Communications Department 130, 230…ROM 140, 240…RAM 150…Frost-proof fan DB 151...Measured temperature DB 152…Temperature distribution DB 111…Temperature distribution measurement section 112...Frost prevention fan control unit 200…Drone 211…Drone control unit 212...Temperature measurement section R…Crop H1…First height H2: Second height H3…The third height Dn, D1, D2, DN...Measurement points A1: First airflow area A2: Second airflow area A3: Third airflow area B1~B3: Fields

Claims

1. A frost prevention fan that blows air into the field, An autonomous drone equipped with a temperature sensor that measures at least the air temperature; A control device for controlling the drone and the anti-frost fan, The drone measures an air temperature above the field while flying above the field, and transmits temperature data indicating the measured air temperature to the control device; The control device controls the airflow of the frost prevention fan based on the temperature data. A frost prevention fan system.

2. The drone further includes a position sensor that detects the position of the drone itself, and transmits the temperature data indicating the air temperature measured while flying a flight path set above the field, together with position data indicating the position where the air temperature was measured, to the control device.

2. The frost-proof fan system according to claim 1 .

3. The drone measures air temperature at a plurality of measurement points at different heights above the field, and transmits temperature data indicating the air temperature measured at each of the measurement points together with the position data indicating the position at which the air temperature was measured to the control device; When the control device determines that an inversion layer exists above the field based on the air temperatures measured at the plurality of measurement points, the control device operates the anti-frost fan.

3. The frost-proof fan system according to claim 2.

4. At least one of the measurement points is at a first height that is less than or equal to one-third of the height of the frost prevention fan; At least one of the measurement points is at a second height that is greater than or equal to two-thirds and less than or equal to four-thirds of the height of the frost prevention fan.

4. The frost-proof fan system according to claim 3.

5. the first height is a height near the ground; The second height is the same height as the frost prevention fan.

5. The frost-proof fan system according to claim 4.

6. A plurality of the measurement points are set at the first height, The control device creates temperature distribution data indicating a temperature distribution at the first height, identifies a low-temperature area at the first height, and adjusts the blowing direction of the frost prevention fan so as to blow air to the identified low-temperature area.

6. The frost-proof fan system according to claim 4 or 5.

7. The control device determines that an inversion layer exists when a difference between the temperature measured at the second height and the temperature measured at the first height is equal to or greater than a reference value, and operates the anti-frost fan.

6. The frost-proof fan system according to claim 4 or 5.

8. When the air temperature measured at the lowest measuring point is equal to or higher than a reference temperature, the control device determines that there is no risk of frost and stops the anti-frost fan.

5. The frost-proof fan system according to claim 3 or 4.

9. The control device receives wind speed data indicating a wind speed in the field, and when it determines that the wind speed is equal to or higher than a reference wind speed, stops the anti-frost fan.

3. The frost-proof fan system according to claim 1 or 2.

10. The anti-frost fan includes a first anti-frost fan that blows air to a first air blowing area and a second anti-frost fan that blows air to a second air blowing area, The drone flies over the first air blowing area and the second air blowing area at a plurality of heights, and measures temperatures in the first air blowing area and the second air blowing area at a plurality of heights; The control device identifies an area where an inversion layer is formed based on temperature data indicating the temperature measured by the drone, and operates the first anti-frost fan or the second anti-frost fan so as to blow air to the area where an inversion layer is formed among the first air blowing area and the second air blowing area.

3. The frost-proof fan system according to claim 1 or 2.

11. A frost prevention fan that blows air into the field, An autonomous drone equipped with a temperature sensor that measures at least the air temperature; A method for blowing air using an anti-frost fan system including the drone and a control device for controlling the anti-frost fan, Using the drone, while flying above the field, measure the air temperature above the field, and transmit temperature data indicating the measured air temperature to a control device; The control device controls the airflow of the anti-frost fan based on the temperature data. A method of blowing air.

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