Time synchronization method for satellite time service three-axis flight simulation turntable and tested inertial navigation system

Abstract

The invention provides a time synchronization method for a satellite time service three-axis flight simulation turntable and a measured inertial navigation system, and the method comprises the steps: carrying out the time service of the three-axis flight simulation turntable through the precise time calculated by a satellite receiver; taking the accurate time resolved by the satellite receiver as the reference time of time synchronization of the triaxial flight simulation turntable and the measured inertial navigation system; employing 5ms pulses on the satellite receiver for triggering the measured inertial navigation system to send data outwards, and employing a 1s pulse on the satellite receiver for setting the frame number of the measured inertial navigation system to be zero, so the output form of the inertial navigation data frame number of the measured inertial navigation system is 0-199, and one cycle is completed every second; enabling the inertial navigation data output by the measured inertial navigation system with the frame number being zero to be aligned with turntable data output by the three-axis flight simulation turntable at the whole second moment, and after first alignment, enabling each subsequent group of data to be automatically aligned, so time synchronization of the three-axis flight simulation turntable and the measured inertial navigation system is realized.

Description

technical field [0001] The invention relates to the technical field of inertial navigation, in particular to a method for time synchronization between a satellite timing three-axis flight simulation turntable and an inertial navigation system under test. Background technique [0002] With the development and improvement of inertial navigation technology, the test requirements of inertial devices are becoming more and more stringent. In the process of calibration and testing of inertial devices, an indispensable auxiliary experimental tool is the three-axis flight simulation turntable. For a high-precision attitude measurement system, the accuracy, stability, and speed of tracking the attitude of the carrier are crucial. Due to the high precision, large maneuvering range, and good controllability of the three-axis flight simulation turntable, it can be effectively Simulate a variety of dynamic environments, so that a comprehensive simulation test of the inertial navigation sy...

AI Technical Summary

Problems solved by technology

Since the reference time of the inertial navigation system and the turntable system are not the same and there is a slight difference in the power-on time, even if the frame numbers of the three-axis flight simulation turntable and the data of the inertial navigation system under test are aligned manually, the data of the two will not be the same. There will be a slight difference in time. This is because the time bases of the two are different, so it is impossible to guarantee that the sampling points of the two data sampling points are at the same time. There may be a phase difference between the two adoption cycles, which may be measured by the inertial navigation system. It is the attitude value of the three-axis flight simulation turntable at a certain moment before this moment, and the output displayed by the three-axis flight simulation turntable is the attitude value of the three-axis flight simulation turntable at this moment, which will lead to inaccurate testing of the accuracy of the inertial navigation system

[0004] In addition, this method that requires subsequent time frame number alignment is also difficult to achieve long-term continuous real-time high-precision accuracy evaluation of the inertial navigation system under test using a three-axis flight simulation turntable

Images