Human sensing detection method using radio waves utilizing radio wave absorption characteristics of human body

Abstract

To solve the problem in which human sensing detection using a radio wave method of an IQ signal does not produce results consistent with a radio wave propagation theory in enclosed spaces, such as unit bathrooms, where metal is embedded in walls.SOLUTION: A human sensing detection method using radio waves utilizing radio wave absorption characteristics of a human body includes measuring the total amount of radio waves when no one is present in an enclosed space in which there is provided a single or multiple radio wave sensors including at least a reference radio wave oscillation unit, a radio wave transmitting unit, a transmitting antenna unit, a receiving antenna unit, a radio wave receiving unit, an IQ signal processing unit, a distance calculation unit, a movement calculation unit, a memory unit for each reflected wave component, and a power supply unit, storing a value for each reflected wave component, extracting a component whose value, which is stored when no one is present, decreases each time someone enters the space and moves around, and thereby detecting a position and movement of a person. The human sensing detection method makes it easy to detect the location and movement of the person.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for detecting human presence using radio waves, utilizing the radio wave absorption characteristics of the human body. [Background technology]

[0002] Known electronic methods for detecting human presence include an infrared method, a radio wave method, and an image processing method.

[0003] The radio wave method has the advantage of being able to detect overlapping objects at different distances, so it is being used in an increasing number of products.

[0004] The radio wave method uses "In-Phase / Quadrature-Phase" (IQ) signals, which makes it possible to measure displacement in addition to distance.

[0005] When using radio wave positioning, a person's location can be determined by calculating the distance from the amount of radio wave reflection received by the positioning device when radio waves are emitted from the positioning device and reflected by the person.

[0006] In radio wave positioning, a person's displacement can be calculated from the phase difference between the radio waves emitted from the positioning device, reflected by the person, and received by the positioning device.

[0007] Human presence detection using the radio wave method of IQ signals produces results that are almost in line with radio wave propagation theory in free space.

[0008] In enclosed spaces where metal is embedded in the walls, such as unit bathrooms, human presence detection using the IQ signal's radio wave method does not produce results consistent with radio wave propagation theory. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 6537701 Summary of the Invention [Problem to be solved by the invention]

[0010] The advantage of this is that in enclosed spaces where metal is embedded in the walls, such as unit bathrooms, it is easy to detect the presence of human beings using the IQ signal's radio wave method. [Means for solving the problem]

[0011] The present invention is a method for detecting the difference between an unoccupied person and a person present in an enclosed space with metal embedded in the wall, such as a unit bathroom, by measuring the difference in total radio wave intensity. Effect of the Invention

[0012] The present invention is a method that utilizes the characteristic that the total amount of radio waves decreases when an occupant is present in an enclosed space with metal embedded in the wall, such as a modular bathroom, as the human body absorbs radio waves compared to the total amount of radio waves when no one is present.

[0013] In enclosed spaces with metal embedded in the walls, such as a unit bathroom, the total amount of radio waves when there is no one there can be stored for each reflected wave component, and when people are present and move around, the location and movement of the people can be calculated by comparing which reflected wave components decrease. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is an explanatory diagram of a method for detecting human presence using radio waves that utilizes the radio wave absorption characteristics of the human body (embodiment). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] A radio wave sensor 1 having at least a reference radio wave oscillator, a radio wave transmitter, a transmitting antenna unit, a receiving antenna unit, a radio wave receiver, an IQ signal processor, a distance calculator, a movement calculator, a memory unit for each reflected wave component, and a power supply unit is installed on the ceiling of a unit bath.

[0016] A radio wave type sensor 2 having the same configuration is installed on the wall of the unit bath.

[0017] A bathtub 4 is incorporated in the unit bath space 3.

[0018] Person 5 has entered the unit bath.

[0019] The radio wave type sensor 1 and the radio wave type sensor 2 store this value for each reflected wave component of the unit bathroom space 3 when the person 5 is absent.

[0020] When person 5 enters the unit bathroom and moves, a difference occurs between the stored values ​​for each reflected wave component of radio wave sensor 1 and radio wave sensor 2 when person 5 is absent because person 5 acts as an absorber for the emission and reflection of radio waves.

[0021] The difference between the component values ​​stored for each reflected wave component can be compared to calculate a person's position and movement. [Industrial Applicability]

[0022] The example in Figure 1 shows the possibility of further promoting the use of radio waves in situations where human presence detection using the radio wave method of IQ signals does not obtain results in line with radio wave propagation theory, such as in enclosed spaces where metal is embedded in the walls, such as unit bathrooms. [Explanation of symbols]

[0023] 1. Radio wave sensor 2. Radio wave sensor 3 Unit bath space 4. Bathtub 5 people

Claims

[Claim 1] A method for detecting human presence using radio waves that utilizes the radio wave absorption characteristics of the human body, in which a single or multiple radio wave sensors having at least a reference radio wave oscillator, a radio wave transmitter, a transmitting antenna unit, a receiving antenna unit, a radio wave receiver, an IQ signal processor, a distance calculation unit, a movement calculation unit, a memory unit for each reflected wave component, and a power supply unit are installed in an enclosed space, the total amount of radio waves is measured when no one is present, the values ​​are stored for each reflected wave component, and the components that were stored when no one is present but whose values ​​decrease each time someone enters the space and moves around are extracted to detect the position and movement of people.

Images