Abstract
In order to improve the precision of the spaceborne Inertial Measurement Unit (IMU), this paper proposes an adhesive joint assembly of the MEMS-redundant IMU. That is the application of special redundant installation of multiple MEMS gyroscopes in the IMU, which can improve the reliability of the MEMS-redundant IMU on the basis of reducing the weight of IMU. However, with the change of working environment, the traditional mechanical assembly of MEMS-redundant IMU will produce the large packaging stress and cause the deformation of MEMS gyroscope. This change will lead to changes in installation errors, scale factor errors, and bias errors of the MEMS gyroscope, resulting in a significant reduction in measurement precision of the MEMS-redundant IMU. Therefore, this paper selects the adhesive material that matches the thermal physical parameters of the material with the circuit board by analyzing the requirements of MEMS gyroscope on working environment at first. Then, by optimizing the bonding process, the installation error of each axis of MEMS-redundant IMU under different temperatures is better than the traditional mechanical connection mode. The experiment results of thermal vacuum show that the new assembly method can reduce the influence of temperature on the bias. Compared with the traditional method, the new assembly which is based on adhesive joint assembly can improve the measurement precision of MEMS-redundant IMU by an order of magnitude.
Highlights
In modern applications, with the growing demand of nanosatellites, the inertial navigation systems are developing towards the direction of low cost, miniaturization, and low power consumption [1, 2]
In order to decline the influence of working environment on gyroscope and improve the precision of Micro electro mechanical system (MEMS) redundant Inertial Measurement Unit (IMU), an optimization method on the precision of MEMSredundant IMU based on adhesive joint assembly is proposed in this paper. is method abandons the traditional way of mechanically installing gyroscopes and circuit boards
In order to reduce the influence of temperature on installation error and improve the measurement precision of the MEMS-redundant IMU, a novel method of redundant MEMS-IMU based on adhesive process is designed instead of the traditional mechanical assembly technique. e thermal vacuum experiments are performed to compare the influence of temperature on the installation error under the traditional and the new assembly method to verify the improvement of performance by the new assembly method
Summary
With the growing demand of nanosatellites, the inertial navigation systems are developing towards the direction of low cost, miniaturization, and low power consumption [1, 2]. E error processing technology of MEMS-redundant IMU is developed to improve the measurement and navigation precision of system [12, 13]. To reduce the error of measurement and improve the precision of inertial navigation system, the traditional method estimates and compensates the alignment error, scale factor error, and bias of gyroscope in MEMS-redundant IMU by calibration compensation technique [14]. When the temperature changed in the working environment of MEMS redundant IMU, MEMS gyroscope influenced by processing manufacturing and environmental conditions will produce deformation. It changes the error of installation and bias and reduces the precision of MEMS redundant IMU [19, 20]. In order to decline the influence of working environment on gyroscope and improve the precision of MEMS redundant IMU, an optimization method on the precision of MEMSredundant IMU based on adhesive joint assembly is proposed in this paper. is method abandons the traditional way of mechanically installing gyroscopes and circuit boards
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