US 11,982,532 B1
Azimuth/attitude angle measuring device
Takafumi Moriguchi, Amagasaki (JP)
Assigned to Sumitomo Precision Products Co., Ltd., Amagasaki (JP)
Filed by Sumitomo Precision Products Co., Ltd., Amagasaki (JP)
Filed on Sep. 22, 2022, as Appl. No. 17/950,250.
Application 17/950,250 is a continuation of application No. PCT/JP2021/011917, filed on Mar. 23, 2021.
Claims priority of application No. 2020-052443 (JP), filed on Mar. 24, 2020.
Int. Cl. G01C 19/5776 (2012.01); G01C 21/16 (2006.01)
CPC G01C 19/5776 (2013.01) [G01C 21/16 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An azimuth/attitude angle measuring device comprising:
a first angular velocity sensor; and
a control unit, wherein
the first angular velocity sensor includes
a vibrator,
a primary side control circuit that has a closed control loop, an output of the closed control loop inducing primary vibration in the vibrator, and
a secondary side control circuit that has a closed control loop for detecting secondary vibration generated in the vibrator due to an angular velocity applied to the vibrator,
the primary side control circuit and the secondary side control circuit are configured so that a function as the primary side control circuit and a function as the secondary side control circuit are interchangeable, and
the control unit is configured to perform control for switching a state of the first angular velocity sensor between a first state in which the angular velocity is detected while repeatedly interchanging the function of the primary side control circuit and the function of the secondary side control circuit and a second state in which the angular velocity is detected without the function of the primary side control circuit and the function of the secondary side control circuit being interchanged.