Information processing device and non-transitory computer-readable storage medium storing program

1 . An information processing device comprising:

an acquisition device configured to acquire, as a first strength, a strength of a radio signal related to position information and received at a position of a first height; and

a first determination device configured to determine that the first height is a water level when an attenuation amount of the first strength with respect to a reference strength exceeds a predetermined value, wherein

the acquisition device acquires, as a second strength, a strength of the radio signal received at a position of a second height different from the first height,

the first determination device determines that the second height is the water level when an attenuation amount of the second strength with respect to the reference strength exceeds the predetermined value,

the acquisition device includes:

one antenna configured to receive the radio signal;

a first moving device configured to move the antenna from the position of the first height to the position of the second height; and

a receiving device configured to calculate a strength of the radio signal received by the antenna at the first height as the first strength and calculate a strength of the radio signal received by the antenna at the second height as the second strength, and

the first moving device moves the antenna from the position of the first height to the position of the second height when the first determination device determines that the attenuation amount of the first strength exceeds the predetermined value while the antenna is disposed at the position of the first height.

2 . The information processing device according to claim 1 , wherein

the first determination device determines that the first height is the water level when the acquisition device fails to acquire the position information based on the radio signal received at the position of the first height.

3 . The information processing device according to claim 1 , wherein the acquisition device includes:

a first antenna configured to receive the radio signal at the position of the first height;

a second antenna configured to receive the radio signal at the position of the second height;

a receiving device configured to calculate a strength of the radio signal received by the first antenna at the position of the first height as the first strength and calculate a strength of the radio signal received by the second antenna at the position of the second height as the second strength; and

a switch configured to switch the receiving device between being electrically coupled to the first antenna and being electrically coupled to the second antenna.

4 . The information processing device according to claim 3 , wherein the switch switches the receiving device from being electrically coupled to the first antenna to being electrically coupled to the second antenna when the first determination device determines that the attenuation amount of the first strength exceeds the predetermined value while the receiving device is electrically coupled to the first antenna.

5 . The information processing device according to claim 1 , further comprising a second moving device configured to move the acquisition device to each of a first position and a second position different from the first position, wherein

the acquisition device acquires position information of the first position based on a radio signal received at the first position and acquires position information of the second position based on a radio signal received at the second position.

6 . The information processing device according to claim 5 , wherein

the acquisition device acquires a strength of the radio signal received at the first position as a third strength, and acquires a strength of the radio signal received at the second position as a fourth strength, and

the first determination device determines that the water level at the first position is higher than the water level at the second position when an attenuation amount of the third strength with respect to the reference strength exceeds the predetermined value and an attenuation amount of the fourth strength with respect to the reference strength is smaller than the predetermined value.

7 . The information processing device according to claim 5 , wherein

the acquisition device acquires a strength of the radio signal received at the first position as a third strength, and acquires a strength of the radio signal received at the second position as a fourth strength, and

the first determination device determines that the water level at the first position is higher than the water level at the second position when the third strength is smaller than the fourth strength.

8 . The information processing device according to claim 5 , wherein

the second moving device moves the acquisition device to a third position between the first position and the second position,

the acquisition device acquires position information of the third position based on a radio signal received at the third position,

the acquisition device acquires a strength of the radio signal received at the first position as a third strength, acquires a strength of the radio signal received at the second position as a fourth strength, and acquires a strength of the radio signal received at the third position as a fifth strength, and

the first determination device determines that the third position is a water level when the fifth strength is smaller than the fourth strength and larger than the third strength.

9 . An information processing device comprising:

a communication device configured to receive information including a first height and a first strength indicating a strength of a radio signal related to position information and received at a position of the first height;

a second determination device configured to determine that the first height is a water level when an attenuation amount of the first strength with respect to a reference strength exceeds a predetermined value;

an acquisition device that acquires, as a second strength, a strength of the radio signal received at a position of a second height different from the first height; and

an first determination device that determines that the second height is a water level when an attenuation amount of the second strength with respect to the reference strength exceeds the predetermined value, wherein

the acquisition device includes:

one antenna configured to receive the radio signal;

a first moving device configured to move the antenna from the position of the first height to the position of the second height; and

a receiving device configured to calculate a strength of the radio signal received by the antenna at the first height as the first strength and calculate a strength of the radio signal received by the antenna at the second height as the second strength, and

the first moving device moves the antenna from the position of the first height to the position of the second height when the first determination device determines that the attenuation amount of the first strength exceeds the predetermined value while the antenna is disposed at the position of the first height.

10 . The information processing device according to claim 9 , wherein the second determination device determines that the first height is the water level when the communication device fails to receive the position information.

11 . The information processing device according to claim 9 , wherein

the communication device receives information including a second height different from the first height and a second strength indicating a strength of a radio signal received at a position of the second height, and

the second determination device determines that the second height is the water level when an attenuation amount of the second strength with respect to the reference strength exceeds the predetermined value.

12 . The information processing device according to claim 9 , wherein

the communication device receives:

first information including position information of a first position and a third strength indicating a strength of a radio signal received at the first position; and second information including position information of a second position different from the first position and a fourth strength indicating a strength of a radio signal received at the second position, and

the second determination device determines that the water level at the first position is higher than the water level at the second position when an attenuation amount of the third strength with respect to the reference strength exceeds the predetermined value and an attenuation amount of the fourth strength with respect to the reference strength is smaller than the predetermined value.

13 . The information processing device according to claim 9 , wherein

the communication device receives:

first information including position information of a first position and a third strength indicating a strength of a radio signal received at the first position; and second information including position information of a second position different from the first position and a fourth strength indicating a strength of a radio signal received at the second position, and

the second determination device determines that the water level at the first position is higher than the water level at the second position when the third strength is smaller than the fourth strength.

14 . The information processing device according to claim 9 , wherein

the communication device receives:

first information including position information of a first position and a third strength indicating a strength of a radio signal received at the first position;

second information including position information of a second position different from the first position and a fourth strength indicating a strength of a radio signal received at the second position; and

third information including position information of a third position between the first position and the second position and a fifth strength indicating a strength of a radio signal received at the third position, and

the second determination device determines that the third position is a water level when the fifth strength is smaller than the fourth strength and larger than the third strength.

15 . A non-transitory computer-readable storage medium storing a program, the program being configured to cause a computer to execute:

acquiring, by an acquisition device, as a first strength, a strength of a radio signal related to position information and received at a position of a first height; and

determining, by a first determination device, that the first height is a water level when an attenuation amount of the first strength with respect to a reference strength exceeds a predetermined value, wherein

the acquisition device acquires, as a second strength, a strength of the radio signal received at a position of a second height different from the first height,

the first determination device determines that the second height is the water level when an attenuation amount of the second strength with respect to the reference strength exceeds the predetermined value,

the acquisition device includes:

one antenna configured to receive the radio signal;

a first moving device configured to move the antenna from the position of the first height to the position of the second height; and

a receiving device configured to calculate a strength of the radio signal received by the antenna at the first height as the first strength and calculate a strength of the radio signal received by the antenna at the second height as the second strength, and

the first moving device moves the antenna from the position of the first height to the position of the second height when the first determination device determines that the attenuation amount of the first strength exceeds the predetermined value while the antenna is disposed at the position of the first height.

16 . A non-transitory computer-readable storage medium storing a program, the program being configured to cause a computer to execute:

receiving, by an acquisition device, information including a first height and a first strength indicating a strength of a radio signal related to position information and received at a position of the first height; and

determining, by a first determination device, that the first height is a water level when an attenuation amount of the first strength with respect to a reference strength exceeds a predetermined value, wherein

the acquisition device acquires, as a second strength, a strength of the radio signal received at a position of a second height different from the first height,

the first determination device determines that the second height is the water level when an attenuation amount of the second strength with respect to the reference strength exceeds the predetermined value,

the acquisition device includes:

one antenna configured to receive the radio signal;

a first moving device configured to move the antenna from the position of the first height to the position of the second height; and

a receiving device configured to calculate a strength of the radio signal received by the antenna at the first height as the first strength and calculate a strength of the radio signal received by the antenna at the second height as the second strength, and

the first moving device moves the antenna from the position of the first height to the position of the second height when the first determination device determines that the attenuation amount of the first strength exceeds the predetermined value while the antenna is disposed at the position of the first height.