Locking accuracy test method and system of dual-shaft rotation frame inertial measurement unit

Abstract

The invention relates to a locking accuracy test method and system of a dual-shaft rotation frame inertial measurement unit. The locking accuracy test method comprises the steps of (1) installing thedual-shaft rotation frame inertial measurement unit on a calibration tool, and placing the dual-shaft rotation frame inertial measurement unit on a marble slab; (2) connecting the test system; (3) enabling an X axis of the inertial measurement unit to be horizontal and a Z axis to face downward; (4) performing polarity check after the dual-shaft rotation frame inertial measurement unit reaches stable time; (5) calculating standard difference A1; (6) calculating locking accuracy B1 of the direction; (7) enabling the X axis of the inertial measurement unit to face sky and a Y axis and the Z axisto be horizontal; (8) performing polarity check after the dual-shaft rotation frame inertial measurement unit reaches stable time; (9) calculating standard difference A2; (10) calculating locking accuracy B2 of the direction; and (11) expressing that the locking accuracy of the dual-shaft rotation frame inertial measurement unit conforms to requirement if the locking accuracy B1 and B2 both are smaller than a preset index value.

Description

technical field [0001] The invention relates to a method and system for testing the locking accuracy of a dual-axis rotating frame inertial group, which is applied to the research and production of the dual-axis rotating frame inertial group. Background technique [0002] The dual-axis rotating frame inertial group refers to the strapdown inertial group with self-calibration and self-alignment functions. It is mainly composed of a dual-axis rotating locking structure, inertia sensitive components and functional circuits. The dual-axis rotating locking mechanism is used to realize inertial group self-calibration And self-aligning indexing and locking, because the dual-axis rotating frame inertial group is essentially a strapdown inertial group with a new structure, so when in use, the frame is locked by the locking mechanism to maintain strapdown characteristics, and the locking mechanism The performance is reflected in two aspects. The first aspect is the locking rigidity, w...

AI Technical Summary

Problems solved by technology

[0003] At present, the method of measuring the locking accuracy is mainly through discrete calibration, using hexahedron tooling to measure the change of the table coordinate system relative to the installation reference coordinate system after repeated locking of the dual-axis rotating frame inertial group (the change of the three Euler angles of αxfαyFαzF ) for circumstantial evidence, but due to the large error in the transfer system of this method, the locking accuracy of the dual-axis rotating frame inertial group itself is a minimum value (arc-second level), so this method cannot identify the high-precision locking situation. Defects with large measurement errors, while the measurement process is cumbersome and takes a long time

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