Distributed POS (Position and Orientation System) sub-IMU (Inertial Measurement Unit) synchronous data acquisition system

Abstract

A distributed POS (Position and Orientation System) sub-IMU (Inertial Measurement Unit) synchronous data acquisition system comprises a synchronous control / data receiving module based on FPGA (Field Programmable Gate Array), a high-speed asynchronous serial bus and a data acquisition / processing module based on ARM (advanced RISC machine), wherein the synchronous control / data receiving module based on FPGA realizes the control of time synchronization of a distributed POS system and receives data of a plurality of sub IMUs in real time; the high-speed asynchronous serial bus realizes communication between the master POS and sub IMUs at different measurement nodes; and the data acquisition / processing module based on ARM realizes parallel acquisition and real-time processing of the signal of a fiber-optic gyroscope, the signal of an accelerometer and the temperature signals of the gyroscope and the accelerometer. The distributed POS sub-IMU synchronous data acquisition system realizes real-time data acquisition of a plurality of sub IMUs of the distributed POS, reduces the size and power consumption of the sub IMUs, meets the requirement of miniaturization of the subsystem and simultaneously realizes time synchronization of the distributed POS system.

Description

technical field [0001] The invention relates to a distributed POS sub-IMU data synchronous acquisition system, which belongs to the technical field of inertia and is mainly applied to the data acquisition of a distributed POS sub-system. Background technique [0002] Aerial remote sensing to achieve high-precision imaging requires the aircraft to move in a straight line at a uniform speed. However, due to factors such as airflow disturbances and flight control system errors, the aircraft will inevitably deviate from the ideal straight line motion at a uniform speed, resulting in motion errors, resulting in a serious decline in the resolution and accuracy of remote sensing imaging. Perform high-precision motion compensation. The Position and Orientation System (POS) is a special inertial / satellite combined measurement system that can accurately measure motion parameters such as the position, velocity, and attitude of the remote sensing load center. It is a high-resolution aer...

AI Technical Summary

Problems solved by technology

However, the main POS system and the sub-IMUs of different measurement nodes are independent systems, and there are different time references, which cannot effectively realize the data fusion of the distributed POS system

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