Calibration apparatus, calibration method, and non-transitory computer readable medium having recorded thereon calibration program

A method for position detection comprising:

• acquiring a first detection value from sensor data relating to a first slit row provided in a mobile body;
• acquiring a second detection value from sensor data relating to a second slit row provided in the mobile body;
• calculating a slit position signal based on the first detection value and the second detection value;
• calculating a first slit number based on the slit position signal;
• acquiring, from the storage device, a predetermined correction value that corrects the slit position signal, based on detection result of the first detection value and the first slit number;
• applying the correction value to the slit position signal, and acquiring the first slit number after correction based on the slit position signal after correction;
• deriving a position of the mobile body based on the first slit number after correction and the first detection value;
• wherein
• the correction value is determined by performing the following processes:
• (1) acquiring a reference slit position signal at each of a plurality of inspection positions in a moving range of the mobile body, and deciding ideal slit numbers corresponding to each of the plurality of inspection positions based on each reference slit position signal;
• (2) acquiring the slit position signals at each of the plurality of inspection positions, detecting a detection position based on the slit position signals, and acquiring an error of the slit position signal with respect to the reference slit position signal at each of the plurality of inspection positions;
• and
• (3) for each detection position acquired by step (2),
• generating the correction value based on any value between a maximum value and a minimum value of two or more errors associated with the detection position, for the detection position in which the ideal slit numbers are acquired at different two or more inspection positions.

A non-transitory computer readable medium having recorded thereon a position detection program that is executed by a computer including a signal processing circuit and a storage device and causes the signal processing circuit to perform the following processes:

• acquiring a first detection value from sensor data relating to a first slit row provided in a mobile body;
• acquiring a second detection value from sensor data relating to a second slit row provided in the mobile body;
• calculating a slit position signal based on the first detection value and the second detection value;
• calculating a first slit number based on the slit position signal;
• acquiring, from the storage device, a predetermined correction value that corrects the slit position signal, based on detection result of the first detection value and the first slit number;
• applying the correction value to the slit position signal, and acquiring the first slit number after correction based on the slit position signal after correction;
• deriving a position of the mobile body based on the first slit number after correction and the first detection value;
• wherein
• the correction value is determined by performing the following processes:
• (1) acquiring a reference slit position signal at each of a plurality of inspection positions in a moving range of the mobile body, and deciding ideal slit numbers corresponding to each of the plurality of inspection positions based on each reference slit position signal;
• (2) acquiring the slit position signals at each of the plurality of inspection positions, detecting a detection position based on the slit position signals, and acquiring an error of the slit position signal with respect to the reference slit position signal at each of the plurality of inspection positions;
• and
• (3) for each detection position acquired by step (2),
• generating the correction value based on any value between a maximum value and a minimum value of two or more errors associated with the detection position, for the detection position in which the ideal slit numbers are acquired at different two or more inspection positions.