Simulated data generation method and system for distributed POS (Position and Orientation System) transfer alignment

Abstract

The invention discloses a simulated data generation method and system for distributed POS (Position and Orientation System) transfer alignment. According to the method and the system, the method comprises the following steps: setting distributed POS device parameters, track parameters and flexural deflection parameters, and generating accurate motion parameters, angular velocity and specific forcedata of the body at a mounting point of a main IMU (Inertial Measurement Unit); considering a misalignment angle of the main IMU, and generating the motion parameter of the main IMU, gyroscope data and accelerometer data. Meanwhile, a wing flexure deflection model is established from an angle of elastic mechanics according to the set flexural deflection parameters, the influences of the wing flexure deflection on positions and speeds of sub-IMUs in three axis directions of a body coordinate system are considered so as to generate the flexural deflection angular data at the mounting point of the main IMU and lever arm deflection data between the main and sub-IMUs, and the accurate motion parameter of the sub-IMUs, gyroscope data and accelerometer data are further generated. The method andsystem disclosed by the invention contribute to improving the accuracy for evaluating the performance of a distributed POS transfer alignment algorithm.

Description

technical field [0001] The invention relates to the technical field of aerial remote sensing inertial navigation systems, in particular to a method and system for generating analog data for distributed POS transfer alignment. Background technique [0002] At present, the airborne earth observation system is developing from a single remote sensing payload to an integrated earth observation system with multiple or multiple remote sensing payloads working simultaneously. For a high-performance airborne earth observation system equipped with multiple or multiple remote sensing loads, it is necessary to achieve high-precision measurement of the motion parameters of each load distribution point. [0003] The Distributed Position and Orientation System (DPOS) is currently the main means to obtain the multi-point position, speed, attitude and other motion parameters of the carrier aircraft. The main components of distributed POS include a high-precision main position and orientatio...

AI Technical Summary

Problems solved by technology

At present, the wing deflection model used in the process of generating simulation data is usually a Markov model. However, the deflection angles at multiple sub-IMU installation points generated by this model are independent of each other and have nothing to do with the actual situation.

The patent application with the application number 201210113395.7 considers the deflection of the wing from the perspective of elastic mechanics theory, and establishes the connection of the deflection angle at each sub-IMU installation point at each moment, but this patent neither considers the impact of the deflection of the wing on The impact of the position and velocity of the sub-IMU on the x-axis and y-axis of the body coordinate system, and the influence of the installation error angle of the main IMU on the simulated data such as the main IMU gyroscope, accelerometer, and attitude are not considered, so that the generated simulated data is consistent with There is still a large gap in the actual situation

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