US 12,474,363 B2
Inertial measurement unit
Fumikazu Otani, Matsumoto (JP); and Taketo Chino, Hokuto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Sep. 7, 2023, as Appl. No. 18/462,922.
Application 18/462,922 is a continuation of application No. 17/511,997, filed on Oct. 27, 2021, granted, now 11,789,032.
Claims priority of application No. 2020-181708 (JP), filed on Oct. 29, 2020.
Prior Publication US 2023/0417790 A1, Dec. 28, 2023
Int. Cl. G01P 1/00 (2006.01); G01P 3/00 (2006.01); G01P 15/18 (2013.01)
CPC G01P 1/006 (2013.01) [G01P 3/00 (2013.01); G01P 15/18 (2013.01)] 1 Claim
OG exemplary drawing
 
1. An inertial measurement unit comprising:
an inertial sensor that outputs inertial information;
a signal processing portion sampling the inertial information at a predetermined sampling interval and converting the inertial information into inertial information data D having a digital value;
a storage unit that stores a plurality of correction parameters related to nonlinear correction coefficients that are errors with respect to a linearity of the inertial information data D;
a parameter control portion that selects multiple selection correction parameters from the plurality of correction parameters based on external information received from an external source;
a weighting coefficient switching portion that applies a respective weighting coefficient to each of the selection correction parameters to produce weighted selection correction parameters, with each weighting coefficient adjusted based on an external information signal as the external information indicative of a movement condition of an object equipped with the inertial sensor; and
a correction calculation portion that corrects the inertial information data D using the weighted selection correction parameters.