A large dynamic performance testing device and method of an inertial measurement unit

Abstract

A large dynamic performance testing device and method for an inertial measurement unit, comprising: a load-bearing structure, a pressure bearing, an angular dial, an angular pointer, a limit pin, a rigid swing arm, and a mounting plate. The load-bearing structure includes a bottom plate, a support column and a cantilever beam connected in sequence. The support column is used to change the distance between the cantilever beam and the bottom plate; the mounting plate is fixedly connected to one end of the rigid swing arm, and the other end of the rigid swing arm is connected to the cantilever beam of the load-bearing structure through the pressure bearing; the connection position of the rigid swing arm and the pressure bearing Set the angle dial, the angle pointer is fixedly connected with the rigid swing arm, the angle dial and the angle pointer are used to measure the rotation angle between the rigid swing arm and the pressure bearing; the rigid swing arm is used to change the distance between the mounting plate and the cantilever beam The cantilever beam is provided with a limit pin for restricting the swing of the rigid swing arm, and the mounting plate is used to install the inertial measurement unit to be measured. The present invention can be used to verify the product performance of the inertial measurement unit under the large dynamic conditions of angular velocity over 1000° / s and acceleration over 5g.

Description

technical field [0001] The invention relates to a large dynamic performance testing device and method of an inertial measurement unit, belonging to the technical field of inertial measurement unit performance verification. Background technique [0002] The inertial measurement unit (IMU) is a key sensor in the inertial navigation system. It generally consists of 3 gyroscopes and 3 accelerometers. It is widely used in aerospace and other fields. In some special cases, inertial measurement unit products need to measure and navigate under large dynamic conditions, such as conditions with an angular velocity of more than 1000° / s. Therefore, before the IMU product is officially put into use, its performance needs to be fully verified in the ground laboratory. [0003] A turntable is usually used to evaluate the performance of inertial measurement unit products. For example, patent CN201310675186.6 discloses a dynamic testing method for inertial navigation systems. This inventio...

AI Technical Summary

Problems solved by technology

For example, patent CN201310675186.6 discloses a dynamic testing method for inertial navigation systems. This invention uses a three-axis turntable to verify the performance of the inertial navigation system. performance testing requirements under certain circumstances, and the turntable is expensive

[0004] In addition to the turntable, patent CN201320777425.4 discloses a simulation test system for inertial navigation technology, including a vehicle, a shelter, an alignment simulation device, a vehicle test system, a GPS forwarding system, and a power supply system. The travel and the rotation of the vehicle-mounted turntable provide a real operating environment for the inertial navigation to be tested, but generally cannot provide a large enough dynamic environment, and the test cost of the invention is relatively high

Patent CN201220006096.9 discloses a gyroscope testing device, including a fulcrum, a power arm, a pendulum, a gyroscope integrated circuit best sample and a gyroscope integrated circuit to be tested, but the invention designs a An active pendulum device, the design is relatively complicated, the development cost is high, and the applicability in the large dynamic environment is not given. In addition, the invention can only be used to measure the gyroscope signal, and cannot verify the navigation performance of the inertial measurement unit.

Images