Inertia measurement unit

Abstract

The invention relates to an inertia measurement unit, which comprises a gyroscope, an accelerometer, a temperature sensor, a GPS (Global Position System), a magnetic field sensor, a pneumatic height gauge, an airspeed pipe, an optical image sensor, a thermal infrared image sensor and a signal processing unit; a signal modulating and converting circuit is connected with output ends of various sensors and used for receiving signals of various sensors; the signal modulating and converting circuit is connected with a calibration and digital processing circuit; the calibration and digital processing circuit is used for processing measurement signals of various sensors and then conveying into an SPI (Serial Peripheral Interface) circuit and a CAN (Controller Area Network) controller; the gyroscope and the accelerometer are connected with a self-detecting circuit and a digital control circuit; the signal modulating and converting circuit is directly connected with the digital control circuit; and the calibration and digital processing circuit is connected with the digital control circuit through an alarm circuit. The inertia measurement unit disclosed by the invention has the advantage of overcoming the inertia measurement precision problem of a micro electromechanical system and is multiple in function, high in precision, low in cost, minimized and high in reliability.

Description

technical field [0001] The invention relates to a measuring device, in particular to an inertial measurement unit. Background technique [0002] Micro-electromechanical system (MEMS) inertial sensors have the advantages of low cost, small size, large measurement range, high reliability, and easy digitization, and the MEMS inertial measurement unit composed of MEMS inertial sensors is an autonomous inertial navigation combination. With the characteristics of good concealment, high data update rate, high short-term accuracy and good stability, the navigation and guidance technology based on MEMS inertial measurement unit has been developed rapidly, and is widely used in the fields of automobile industry, aerospace, national defense technology, etc. . However, limited by the current technological level, detection circuit and other conditions, the current MEMS inertial sensors generally have shortcomings such as low measurement accuracy and large noise, which restricts the accu...

AI Technical Summary

Problems solved by technology

However, limited by the current technological level, detection circuit and other conditions, the current MEMS inertial sensors generally have shortcomings such as low measurement accuracy and large noise, which restricts the accuracy of the system. Necessary measures need to be taken to improve its accuracy.

At the same time, when a MEMS inertial measurement unit is composed of multiple single-axis or dual-axis MEMS inertial sensors, its assembly will bring large errors, which restricts the measurement accuracy of the MEMS inertial measurement unit to a certain extent.

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