MEMS gyroscope accurate installation reference component and installation method thereof

Abstract

The invention provides an assembly of the reference body for the precision installation of a MEMS gyrometer and the installing method. The assembly comprises a precision installation reference body and a mini MEMS vibration gryometer body with a horizontal sensitive-axis that is inserted into the concave space in the reference body. The reference body is made of material with good assembling performance and secondary machining performance. The assembly is connected with a carrier through a first reference face and a second reference face. At installation, firs the preliminary shape of the reference body is machined, and the gyrometer is mounted, then the out-of-spec angle of the input axis of the gyro is measured, the installation drift angle is calculated; then the reference face of the reference body is corrected based on the drift angle so that the drift angle approaches to zero. The invention takes use of the excellent assembling and secondary machining performance of the material from which the reference body is made, improves the installation accuracy of the gyro by machining and correction, is applicable for mini gyrometers with horizontal sensitive-axis installed by circuit board, especially for mini MEMS vibration gyrometer in inertia measuring units in small carriers.

Description

technical field [0001] The invention belongs to the technical field of navigation, guidance and control, in particular to a MEMS gyroscope precision installation reference body assembly and an installation method thereof, which are suitable for low-cost, micro-miniature MEMS vibrating gyroscopes with various sensitive axis levels. Background technique [0002] Inertial measurement unit is a very important device in navigation, guidance and control system. It consists of three gyroscopes and three accelerometers. According to the requirements of the inertial navigation principle, the sensitive axes of the three gyroscopes are required to be perpendicular to each other in space and parallel to the corresponding three carrier coordinate axes. The inertial measurement unit does not rely on external information, does not radiate energy to the outside world, and is not easily disturbed. This unique advantage makes it a widely used main carrier, especially in the fields of aerospac...

AI Technical Summary

Problems solved by technology

[0007] (1) The micro MEMS gyroscope relies on the circuit board to ensure the direction of the horizontal sensitive axis, and the circuit board is generally a plastic substrate, its stiffness, strength, hardness and other indicators are very low, easy to deform, poor stability, low vibration mode, and easy to be affected by The influence of the external environment and poor anti-interference ability greatly reduce the assembly accuracy of the micro MEMS gyroscope body and other components

[0008] (2) The flatness, smoothness and other indicators of the surface of the circuit board are far lower than the general metal mounting surface. If the circuit board with core sensitive components is directly installed on the bracket of the inertial measurement unit, these factors will directly affect the micro MEMS. The size of the vertical deflection angle of the horizontal sensitive axis of the gyroscope makes the installation error of the vertical deflection angle α of the horizontal sensitive axis of the micro MEMS gyroscope large, and the accuracy is difficult to control

[0009] (3) The circuit board is fixed by screws through the mounting holes, and there is generally an interference fit between the mounting holes and the screws. Before the screws are fastened, the gyroscope is not constrained in the mounting reference plane, and the level of the micro MEMS gyroscope cannot be controlled. The installation accuracy of the lateral deflection angle of the sensitive axis, after the screw is tightened, the installation error of the lateral deflection angle β of the horizontal sensitive axis of the micro MEMS gyroscope will be large, and the accuracy is difficult to control

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