JP5206034B2 - Measurement system, buoy, receiver, and measurement method - Google Patents

Description

  The present invention relates to a technique for receiving measurement data from a measurement buoy.

A buoy that is dropped from an aircraft and collects measurement data indicating measurement values measured in water can transmit the measurement data by radio waves. This buoy assigns a radio frequency to each sensor in order to avoid interference between buoys when performing ocean measurements over a wide area. For this reason, when using a large number of sensors, the radio band corresponding to the number of sensors to be used is used, but the radio frequency band is limited. In a limited frequency band, like the configuration disclosed in Patent Document 1, the buoy may be forced to transmit radio waves using the same frequency as the land radio equipment.
JP 7-191137 A

  However, in the configuration disclosed in Patent Document 1, since the buoy transmits radio waves having directivity in a direction close to the horizontal direction, as shown in FIG. 11, the radio waves of buoys dropped near the coast are directly It can reach radio equipment on the land in the horizontal direction and cause radio wave interference.

  In view of the above problems, an object of the present invention is to provide a technique for preventing radio wave interference between a radio wave transmitted by a measurement buoy and a radio wave transmitted by another radio.

   In order to achieve the above object, a measurement system according to the present invention includes a buoy that includes a measurement device and transmits measurement information indicating a measurement value of the measurement device using radio waves with controlled directivity on a vertical plane, and the buoy. A receiver that receives the radio wave transmitted from the receiver and acquires the measurement information.

  The buoy according to the present invention includes a measuring instrument and transmission means for transmitting measurement information indicating a measurement value of the measuring instrument using radio waves with controlled directivity on a vertical plane.

  If the radio wave transmitted by the buoy having the measuring instrument does not interfere with other radio waves, the receiver of the present invention transmits instruction information for instructing the buoy to control the directivity of the radio wave in the vertical plane. And reception means for receiving radio waves from a buoy that transmits measurement information indicating the measurement values of the measuring instrument using radio waves with controlled directivity on a vertical plane.

  In the measuring method of the present invention, a buoy having a measuring instrument can transmit measurement information indicating the measurement value of the measuring instrument using radio waves with controlled directivity on a vertical plane, and receive the radio waves transmitted from the buoys. The measurement information is acquired by a receiver placed at a different position.

  According to the present invention, since the buoy transmits a radio wave whose directivity is controlled on the vertical plane, radio wave interference between the radio wave transmitted by the buoy and other radio waves can be prevented.

(First embodiment)
A first embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an overall view showing the configuration of the measurement system 1. The measurement system 1 is a system that performs underwater measurement by dropping a buoy for underwater measurement from an aircraft and receiving measurement information indicating a measurement value from the buoy. Referring to FIG. 1, the measurement system 1 includes an aircraft 10 and a buoy 20.

  FIG. 2 is a block diagram showing the configuration of the aircraft 10. Referring to FIG. 1, aircraft 10 includes a transmission unit 101, a reception unit 103, map information 105, and a GPS (Global Positioning System) 107.

  In the present embodiment, the aircraft is not limited to a fixed wing aircraft, but means a machine that flies in the atmosphere such as a rotary wing aircraft, a glider, an airship, and a balloon.

  The transmitting unit 101 wirelessly transmits to the buoy 20 instruction information 1011 for instructing directivity control on a plane that is perpendicular to the water surface and includes the central axis of the buoy (hereinafter referred to as “vertical plane”). Specifically, the instruction information 1011 includes information for instructing (UP) the radiation angle on the vertical plane of the radio wave to be greater than or equal to a predetermined value, or information for instructing to be less than the predetermined value (DOWN). The radiation angle is an angle formed between the direction in which the radio wave intensity (gain) is maximum on the vertical plane and the horizontal direction. The receiving unit 103 receives measurement information 1031 indicating the measurement value measured by the buoy 20 from the buoy 20 and stores the received measurement information 1031.

  Note that the range of the radiation angle indicated by the instruction information is not limited to a range that is greater than or equal to a predetermined value. For example, the instruction information can indicate an upper limit value and a lower limit value. In addition to the radiation angle, the aircraft 10 can also instruct the radiation intensity at the radiation angle to be within a predetermined range.

  The map information 105 is information indicating a map around the area where the buoy 20 is dropped, and this map information 105 is obtained if there is another radio that transmits radio waves that may interfere with radio waves transmitted by the buoy 20. And information indicating the transmission range of the transmission radio wave.

  The GPS 107 acquires the current position where the aircraft 10 is flying. For example, the GPS 107 transmits / receives radio waves to / from a plurality of satellites in orbit, performs three-dimensional positioning based on the difference in transmission / reception time, and obtains the current position. The GPS 107 also acquires the position where the aircraft 10 dropped the buoy 20.

  The aircraft 10 obtains the transmission range of the transmission radio wave of the buoy 20 from the drop position of the buoy 20 acquired by the GPS 107. And the transmission range of another radio | wireless machine is read from the map information 105. FIG. Here, the transmission range is a transmission range of radio waves on a horizontal plane. The transmission range may include not only a horizontal plane but also a radio wave transmission range on a vertical plane.

  The aircraft 10 determines whether or not the transmission radio wave of the buoy 20 interferes with the transmission radio wave of another wireless device. The buoy 20 transmits radio waves in a direction close to the horizontal direction with a radiation angle as small as possible so that the aircraft 10 can receive the radio waves of the buoy 20 from a long distance. However, for example, when the buoy 20 is dropped near the coast, if the radiation angle is small, radio waves transmitted in a direction close to the horizontal direction may interfere with radio waves transmitted from nearby ground facilities.

  If it is determined that radio wave interference occurs, the aircraft 10 wirelessly transmits to the buoy 20 instruction information 1011 that instructs (UP) the radiation angle on the vertical plane to be greater than or equal to a predetermined value.

  By increasing the radiation angle with respect to the horizontal direction to some extent, the intensity of the radio wave transmitted in the horizontal direction becomes relatively smaller than the intensity of the radio wave transmitted in the vertical direction. As a result, it is possible to prevent radio wave interference with radio waves from coastal radio equipment in the horizontal direction.

  If the radiation intensity in the direction is increased while the radiation angle is set to a predetermined value or more, the beam is narrowed, and the intensity of the transmission radio wave in the horizontal direction is relatively further reduced.

  On the other hand, when radio wave interference does not occur, the aircraft 10 wirelessly transmits to the buoy 20 instruction information 1011 for instructing the radiating angle to be less than a predetermined value (DOWN).

  As described above, the aircraft 10 wirelessly transmits to the buoy 20 instruction information 1011 that instructs (UP) the radiation angle on the vertical plane to be equal to or greater than a predetermined value when radio wave interference with other wireless devices may occur. . On the other hand, when radio wave interference with other wireless devices does not occur, instruction information 1011 for instructing the emission angle to be less than a predetermined value (DOWN) is wirelessly transmitted to the buoy 20.

  It should be noted that the ship or ground radio equipment may transmit the instruction information 1011 to the buoy 20 and the aircraft 10 may receive the measurement information from the buoy 20. Further, the aircraft that transmits the instruction information to the buoy 20 need not be the same aircraft as the aircraft that receives the measurement information from the buoy 20.

  The buoy 20 may also have a GPS and transmit its own position information to the aircraft 10, and the aircraft 10 may obtain the radio wave transmission range of the buoy 20 from the received position information.

  Returning to FIG. 1, the buoy 20 is dropped from the aircraft 10, decelerated by a parachute, etc., and landed. The buoy 20 has a floating part 21 and an underwater sensor 23. The floating portion 21 and the underwater sensor 23 are integrated when dropped and separated after landing. The flying portion 21 has an antenna 22 and a radio circuit 24. The floating portion 21 floats on the water surface such that the antenna 22 jumps to the water surface by obtaining buoyancy by spreading the float with carbon dioxide gas or the like.

  The antenna 22 is a dipole antenna, for example, and includes antenna elements 22A and 22B. The antenna 22 receives instruction information from the aircraft 10 and transmits a radio wave whose directivity is controlled in the vertical plane according to the instruction information. The antenna elements 22A and 22B are arranged so as to be perpendicular to the water surface when the floating portion 21 floats on the water surface.

  FIG. 3A shows the radiation intensity and radiation angle of the vertical plane of the radio wave transmitted by the buoy 20 when the instruction information 1011 that instructs the radiant angle to be less than a predetermined value (DOWN) on the vertical plane of the radio wave is received. FIG. As shown in FIG. 5A, the buoy 20 transmits radio waves having a radiation angle of 0 degrees, that is, directivity directed in the horizontal direction. FIG. 5B is a side view showing the transmission range of the radio wave transmitted by the buoy 20 when receiving the instruction information 1011 that instructs (UP) the radiation angle to be greater than or equal to a predetermined value on the vertical plane of the radio wave. . As shown in FIG. 5B, the buoy 20 transmits a radio wave whose directivity is controlled so that the radiation angle (θ) is a predetermined value (for example, 30 degrees) or more on the vertical plane. The buoy 20 feeds power by giving a phase difference to each of the antenna elements 22A and 22B, so that the antenna 22 controls the directivity of the radio wave in the vertical plane. In addition, the buoy 20 supplies power without giving a phase difference to the antenna elements 22A and 22B, so that the antenna 22 transmits radio waves having directivity directed in the horizontal direction. In the figure, a one-dot chain line indicates a transmission range of a radio wave transmitted from each antenna element having a predetermined intensity or more.

  In this embodiment, two antenna elements are provided. However, the number of antenna elements and the type of antenna are not limited as long as radio waves can be transmitted by controlling the radiation angle in the vertical plane.

  Returning to FIG. 1, the underwater sensor 23 includes one or more measuring devices such as a temperature sensor, a sonar, and a pressure gauge, and measures a water temperature, a position of a school of fish, a water pressure, and the like. Then, the underwater sensor 23 transmits measurement information indicating the measurement value to the wireless circuit 24.

  Note that the buoy 20 may have a configuration that includes a sensor for measuring temperature, wind speed, and the like on the water in addition to the underwater sensor 23.

  The radio circuit 24 transmits the measurement information received from the underwater sensor 23 to the antenna 22 by using a radio wave whose directivity on the vertical plane is controlled.

  The configuration of the radio circuit 24 will be described in detail with reference to FIG. FIG. 2 is a block diagram showing the configuration of the radio circuit 24. Referring to the figure, the radio circuit 24 includes a receiving unit 241 and a transmitting unit 243. The receiving unit 241 receives the measurement information 2411 from the underwater sensor 23. The receiving unit 241 receives the instruction information 2412 from the aircraft 10 via the antenna 22 and stores the information.

  The transmission unit 243 includes a directivity circuit 2431. The directivity circuit 2432 controls the phase difference that supplies power to the antenna 22 so that a radio wave whose directivity is controlled in the vertical plane is transmitted. The transmission unit 243 wirelessly transmits the measurement information 2411.

  Thus, the radio circuit 24 receives the direction information 2412 from the aircraft 10 via the antenna 22 and receives the measurement information 2411 from the underwater sensor 23. The radio circuit 24 transmits a radio wave whose directivity is controlled on the vertical plane in accordance with the instruction information 2431.

  Next, the operation of the wireless circuit 24 of this embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing the operation of the radio circuit 24. When the wireless circuit 24 lands and power is supplied from a battery (not shown) built in the buoy 20 or the like, the wireless circuit 24 starts the operation shown in FIG. Referring to the figure, the receiving unit 241 receives measurement information 2411 from the underwater sensor 23 (step S5). The receiving unit 241 determines whether or not the instruction information 2411 received from the aircraft 10 is information for instructing (UP) the radiation angle on the vertical plane of the radio wave to be greater than or equal to a predetermined value (step S10).

  When the instruction information 2411 is information that instructs (UP) the radiation angle on the vertical plane of the radio wave to be greater than or equal to a predetermined value (step S10: YES), the directivity circuit 2432 has a radiation angle greater than or equal to the predetermined value on the vertical plane. The phase difference is fed to the antenna 22 so that The transmission unit 243 transmits the radio wave with the measurement information 2411 added (step S15).

  When the instruction information 2411 indicates that the emission angle is less than the predetermined value (DOWN) (step S10: NO), the directivity circuit 2432 causes the emission angle to be less than the predetermined value on the vertical plane. Power is supplied to the antenna 22. The transmitting unit 243 transmits the measurement information 2411 in the horizontal direction (step S20). After step S20, the radio circuit 24 ends the operation. The aircraft 10 receives and records the measurement information 2411 transmitted from the buoy 20.

  With reference to FIG. 6, the operation example of the measurement system 1 of this embodiment is demonstrated. Referring to the figure, the aircraft 10 that dropped the buoy 20 is flying over the radio equipment 30 on the ground, for example. The frequency band of the radio wave transmitted by the wireless facility 30 is close to the frequency band of the radio wave transmitted by the buoy 20, and these radio waves may interfere with each other.

  Therefore, the aircraft 10 transmits to the buoy 20 instruction information for instructing (UP) the radiation angle on the vertical plane of the radio wave to be a predetermined value or more. The buoy 20 transmits a radio wave whose directivity is controlled on the vertical plane according to the instruction information (step S15).

  Since the radio wave transmitted by the buoy 20 has a radiation angle equal to or greater than a predetermined value, the radio field intensity in the horizontal direction is relatively low, and the measurement system 1 avoids interference between this radio wave and the radio wave transmitted by the radio equipment 30. Can do.

  As described above, according to the present embodiment, the buoy 20 transmits a radio wave whose directivity is controlled in the vertical plane. If the buoy 20 increases the radiation angle of the transmission radio wave with respect to the horizontal direction, the intensity of the transmission radio wave in the horizontal direction relatively decreases, and interference with other radio waves from the horizontal direction can be prevented.

  In addition, since the buoy 20 controls the directivity in the vertical plane according to the instruction information 1011, the aircraft 10 can control the radio wave transmission of the buoy 20 by transmitting the instruction information 1011.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. The configuration of the communication system of the present embodiment is the same as that of the first embodiment except that the aircraft 10 does not transmit the instruction information 1011 to the buoy 20. FIG. 7 is an overall view showing the configuration of the radio circuit 24a of the present embodiment. Referring to the figure, the radio circuit 24a does not receive the instruction information 2412 and has map information 245 and a GPS (Global Positioning System) 247, as compared with the radio circuit 24 of the first embodiment. The second embodiment differs from the first embodiment in that the buoy 20 does not receive the instruction information 2412 and has the map information 245 and the GPS 247.

  The map information 245 and the GPS 247 have the same configuration as the map information 105 and the GPS 107 that the aircraft 10 has in the first embodiment. However, the GPS 107 obtains the current position where the buoy 20 is floating.

  The buoy 20 obtains the transmission range of the radio wave transmitted by itself from the current position acquired by the GPS 247. Then, the other radio wave transmission range is read from the map information 105. The buoy 20 determines whether its own transmission radio wave interferes with the transmission radio wave of another wireless device based on its current position and the transmission range of the other radio wave. When radio wave interference occurs, the buoy 20 transmits a radio wave having a radiation angle equal to or greater than a predetermined value on the vertical plane. When radio wave interference does not occur, the buoy 20 transmits a radio wave having a radiation angle less than a predetermined value.

  FIG. 8 is a flowchart showing the operation of the radio circuit 24a of this embodiment. Referring to the figure, after receiving the measurement information 2411 (step S5), the radio circuit 24a reads the transmission range of the transmission radio wave of the other radio equipment 30 from the map information 245 (step S11). Subsequently, the GPS 247 acquires the current position where the buoy 20 is floating (step S13). Then, the radio circuit 24a determines whether or not its own transmission radio wave interferes with the transmission radio wave of another wireless device based on the results of steps S11 and S13 (step S13).

  When radio wave interference occurs (step S13: YES), the directivity circuit 2431 supplies phase difference power to the antenna 22 so that a radio wave having a radiation angle of a predetermined value or more on the vertical plane is transmitted. The transmission unit 243 wirelessly transmits the measurement information 2411 (Step S15).

  When radio wave interference does not occur (step S10: NO), the directivity circuit 2432 supplies power to the antenna 22 so that a radio wave having a radiation angle less than a predetermined value is transmitted. The transmission unit 243 wirelessly transmits the measurement information 2411 (Step S20).

  As described above, according to the present embodiment, the buoy 20 determines the presence or absence of radio wave interference based on the current position of itself and the transmission range of another wireless device, so that it does not receive instruction information from the aircraft 10. In both cases, radio waves can be transmitted so that radio wave interference does not occur.

  In the present embodiment, the buoy 20 may be configured to determine whether radio wave interference occurs by receiving the map information 245 or the drop position of the buoy 20 from the aircraft 10.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. 9 and FIG. The configuration of the communication system of the present embodiment is the same as that of the first embodiment except that the aircraft 10 transmits a control radio wave to the buoy 20 instead of the instruction information 1011. FIG. 9 is an overall view showing the configuration of the wireless circuit 24b of the present embodiment. Referring to the figure, the radio circuit 24b does not have the instruction information 2412 and obtains the incident angle 2413 as compared with the radio circuit 24 of the first embodiment. The second embodiment differs from the first embodiment in that the buoy 20 does not receive the instruction information 2412 and obtains the incident angle 2413.

  The aircraft 10 flies in a relatively high sky when it is desired to avoid radio wave interference with ground radio equipment, and flies in a relatively low sky when it is not necessary. When receiving the measurement information 1031 from the buoy 20, the aircraft 10 transmits a control radio wave to the buoy 20.

  When receiving the control radio wave from the aircraft 10, the transmission unit 241 detects the phase difference between the electrical signals from the antenna elements 22 </ b> A and 22 </ b> B, and obtains the incident angle 2413 of the control radio wave from the aircraft 10 from the detected phase difference. If the calculated incident angle 2413 is equal to or greater than a predetermined value, the radio circuit 24b transmits a radio wave having a radiation angle equal to or greater than a predetermined value on the vertical plane. On the other hand, if the determined incident angle 2413 is less than a predetermined value, the radio circuit 24b transmits a radio wave having a radiation angle less than the predetermined value.

  FIG. 10 is a flowchart showing the operation of the radio circuit 24b of this embodiment. Referring to the figure, the operation of the radio circuit 24b of the present embodiment is the same as the operation of the radio circuit 24 of the first embodiment shown in FIG. 5 except that step S14 is executed instead of step S10.

  After receiving the measurement information 2411 (step S5), the radio circuit 24b obtains the incident angle 2413 of the control radio wave from the aircraft 10 from the phase difference between the electrical signals from the antenna elements 22A and 22B. Then, the radio circuit 24b determines whether or not the calculated incident angle 2413 is greater than or equal to a predetermined value (step S14). If the determined incident angle 2413 is equal to or greater than a predetermined value (step S14: YES), the radio circuit 24b transmits a radio wave having a radiation angle equal to or greater than a predetermined value on the vertical plane (step S15). On the other hand, if the determined incident angle 2413 is less than a predetermined value (step S14: NO), the radio circuit 24b transmits a radio wave having a radiation angle less than the predetermined value (step S20).

  As described above, according to the present embodiment, the buoy 20 controls the directivity in the vertical plane based on the incident angle of the control radio wave from the aircraft 10, so that the aircraft 10 does not have to transmit the instruction information 1011. The buoy 20 can transmit radio waves so as to avoid radio wave interference.

  Note that the radio circuit 24b may be configured to transmit radio waves having an incident angle 2413 obtained in step S14 and a radiation angle within a predetermined range. With this configuration, radio waves that match the altitude of the aircraft 10 are transmitted, and the aircraft 10 can easily receive the measurement information 1031.

  All or part of the processing shown in FIGS. 5, 8, and 10 can also be realized by a computer executing a software program.

1 is an overall view illustrating a configuration of a measurement system according to a first embodiment. It is a block diagram which shows the structure of the aircraft of a 1st Example. It is a figure which shows the transmission range of the electromagnetic wave of the buoy of 1st Embodiment. It is a block diagram which shows the structure of the radio | wireless circuit of 1st Embodiment. It is a flowchart which shows operation | movement of the radio | wireless circuit of 1st Embodiment. It is a figure which shows the operation example of the measurement system of 1st Embodiment. It is a block diagram which shows the structure of the radio | wireless circuit of 2nd Embodiment. It is a flowchart which shows operation | movement of the radio | wireless circuit of 2nd Embodiment. It is a block diagram which shows the structure of the radio | wireless circuit of 3rd Embodiment. It is a flowchart which shows operation | movement of the radio | wireless circuit of 3rd Embodiment. It is a general view which shows the structure of the conventional measurement system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Measurement system 10 Aircraft 20 Buoy 21 Floating part 22 Antenna 23 Underwater sensor 24, 24a Radio circuit 30 Radio equipment 22A, 22B Antenna element 101, 241 Transmitter 103, 243 Receiver 105, 245 Map information 107, 247 GPS
1011 Instruction information 1031 Measurement information 2411 Measurement information 2412 Instruction information 2431 Directional circuit

Claims (20)

A buoy having a measuring instrument and transmitting measurement information indicating the measurement value of the measuring instrument with radio waves with controlled directivity on a vertical plane;
A receiver that receives the radio wave transmitted from the buoy and obtains the measurement information;
I have a,
The receiver determines whether a radio wave transmitted by the buoy interferes with other radio waves, and transmits instruction information for instructing the buoy to control directivity on a vertical plane of the radio wave based on the determination. And
The buoy is a measurement system that controls directivity of the radio wave in a vertical plane according to the instruction information received from the receiver . A buoy having a measuring instrument and transmitting measurement information indicating the measurement value of the measuring instrument with radio waves with controlled directivity on a vertical plane;
A receiver that receives the radio wave transmitted from the buoy and obtains the measurement information;
Have
The buoy previously stores transmission range information indicating the transmission range of other radio waves, acquires its current position, and based on the transmission range indicated by the transmission range information and the acquired current position. A measurement system that determines whether or not the radio wave transmitted by the other radio wave interferes with the other radio wave, and controls the directivity of the radio wave in the vertical plane. The buoy in directivity control of the radio wave, and controls the emission angle with respect to the horizontal direction in the vertical plane of the radio wave, as claimed in claim 1 or 2 measuring system. The measurement system according to claim 3 , wherein the buoy controls a radiation intensity at the radiation angle of the radio wave in controlling the directivity of the radio wave. The receiver is mounted on an aircraft, transmits control radio waves to the buoy,
The buoy receives the control radio wave from the receiver, acquires an incident angle on the vertical plane of the received control radio wave, and controls directivity on the vertical plane of the radio wave according to the acquired incident angle. The measurement system according to any one of claims 1 to 4.   The measurement system according to claim 5, wherein the buoy receives the control radio wave with an antenna and acquires the incident angle based on a phase difference of an electric signal from the antenna.   The measurement system according to claim 5, wherein the buoy is controlled so that an angle difference between the radiation angle and the incident angle is within a predetermined range. Measuring instruments,
Transmitting means for transmitting measurement information indicating the measurement value of the measuring instrument by radio waves with controlled directivity on a vertical plane;
Storage means for storing transmission range information indicating the transmission range of other radio waves;
Current position acquisition means for acquiring its current position;
Have
The transmission means interferes with radio waves transmitted by itself and other radio waves based on the transmission range indicated by the transmission range information read from the storage means and the current position acquired by the current position acquisition means. A buoy that controls the directivity of the radio wave in the vertical plane . The buoy according to claim 8 , wherein, in the control of the directivity of the radio wave, the transmission unit controls a radiation angle with respect to a horizontal direction on a vertical plane of the radio wave. The buoy according to claim 9 , wherein the transmission unit controls a radiation intensity at the radiation angle of the radio wave in controlling the directivity of the radio wave. Further comprising instruction information receiving means for receiving instruction information for instructing directivity control in the vertical plane of the radio wave;
The buoy according to any one of claims 8 to 10 , wherein the transmitting unit controls directivity of the radio wave in a vertical plane according to the instruction information received by the instruction information receiving unit. Control radio wave receiving means for receiving control radio waves from an aircraft;
Incident angle acquisition means for acquiring an incident angle on a vertical plane of the control radio wave received by the control radio wave reception means;
Further comprising
The buoy according to any one of claims 8 to 11 , wherein the transmitting unit controls directivity of the radio wave in a vertical plane according to the incident angle acquired by the incident angle acquiring unit. The buoy according to claim 12 , wherein the incident angle acquisition unit acquires the incident angle based on a phase difference of an electrical signal from the control radio wave reception unit. The buoy according to claim 12 or 13 , wherein the transmission means controls the angle difference between the radiation angle and the incident angle to be within a predetermined range. A transmission that determines whether a radio wave transmitted by a buoy having a measuring instrument interferes with other radio waves, and transmits instruction information for instructing the buoy to control directivity on a vertical plane of the radio wave based on the determination Means,
Receiving means for receiving radio waves from a buoy for transmitting measurement information indicating measurement values of the measuring instrument by radio waves with controlled directivity on a vertical plane;
Having a receiver. The buoy according to claim 15 , wherein the instruction information includes information indicating an emission angle with respect to a horizontal direction on a vertical plane of the radio wave. The buoy according to claim 16 , wherein the instruction information includes information indicating a radiation intensity at the radiation angle of the radio wave. On board the aircraft,
The receiver according to any one of claims 15 to 17 , further comprising control radio wave transmission means for transmitting a control radio wave to the buoy. A buoy having a measuring instrument transmits measurement information indicating the measurement value of the measuring instrument by radio waves with controlled directivity on a vertical plane,
The measurement information is obtained by a receiver arranged at a position where the radio wave transmitted from the buoy can be received ,
The receiver determines whether a radio wave transmitted by the buoy interferes with other radio waves, and transmits instruction information for instructing the buoy to control directivity on a vertical plane of the radio wave based on the determination. And
A measurement method in which the buoy controls directivity of the radio wave in a vertical plane in accordance with the instruction information received from the receiver .   A buoy having a measuring instrument transmits measurement information indicating the measurement value of the measuring instrument by radio waves with controlled directivity on a vertical plane,
  The measurement information is obtained by a receiver arranged at a position where the radio wave transmitted from the buoy can be received,
  The buoy previously stores transmission range information indicating the transmission range of other radio waves, acquires its current position, and based on the transmission range indicated by the transmission range information and the acquired current position. Measuring method of determining whether or not the radio wave transmitted by the radio wave interferes with the other radio wave and, if so, controlling the directivity of the radio wave in the vertical plane.

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