A Quantitative Evaluation Method of Transfer Alignment Accuracy Based on Common Base Installation

Abstract

The invention belongs to the field of inertial navigation system performance assessment and relates to a co-base installation-based transfer alignment accuracy quantitative evaluation method aiming at strapdown inertial navitation system transfer alignment accuracy. The method comprises installing slave and main inertial navigation devices sharing a base on an aluminum plate, constructing slave and main inertial navigation device orientation installation misalignment angles, putting the aluminum plate with the slave and main inertial navigation devices on a high precision rotary table, guiding the y axis of the main inertial navigation device to point to the true north direction through an optical sighting telescope, measuring slave and main inertial navigation device y axis orientation installation error angles as orientation installation error angle reference values through a laser tracker and starting the main inertial navigation device to carry out autocollimation. The method can acquire alignment accuracy evaluation reference before transfer alignment and through comparison between the reference value and the evaluation value, alignment accuracy quantitative evaluation is realized. The method is free of slave inertial navigation device navigation calculation and smooth calculation after alignment, greatly reduces computation complexity and data storage demands and realizes repeated tests in short time.

Description

technical field [0001] The invention belongs to the field of inertial navigation system performance evaluation, and in particular relates to a transfer alignment accuracy quantitative evaluation method based on common base installation for strapdown inertial navigation system transfer alignment accuracy. Background technique [0002] Transfer alignment technology, using high-precision inertial navigation system as the main inertial navigation system, can quickly realize the initial alignment of medium and low-precision inertial navigation systems. The accuracy evaluation of transfer alignment can effectively evaluate the accuracy of transfer alignment schemes, and is used for the evaluation and optimization of transfer alignment schemes. [0003] A typical transfer alignment accuracy evaluation method usually makes the inertial navigation system perform navigation calculation after the transfer alignment is completed, and smoothly estimates the residual misalignment angle at...

AI Technical Summary

Problems solved by technology

The shortcomings of this type of algorithm are: (1) It involves a large amount of data storage and calculation; (2) It is greatly affected by the reliability of external reference information, and has poor applicability to areas with weak coverage of satellite navigation systems such as polar regions; (3) ) azimuth misalignment angle evaluation ability is poor, and the effective evaluation of azimuth misalignment angle depends on the active maneuver of the carrier. For carriers with poor maneuverability such as large ships, it may even be impossible to accurately evaluate the azimuth misalignment angle Case

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