Measuring method for installation errors of alignment prism

Abstract

The invention specifically provides a method for measuring the installation errors of an alignment prism based on the coordinate system of a navigation system to guarantee heading precision of an aircraft during collimation, orientation and inertial guidance, belonging to the technical field of error measurement. An aerospace system coordinate system of an inertial unit is established on the basis of calibration equipment of an inertial instrument, e.g., the spatial attitude of a rotary table, wherein the spatial reference of the rotary table can be represented by a reference surface installed on an inner frame, the normal of a plane formed by three installing plates is used for representing an X axis, and the normal of a plane formed by the generatrices of two positioning pins is used for representing a Y axis; and thus, the installation errors of the alignment prism of the coordinate system of the navigation system are equivalent to alpha and beta, wherein alpha is a parallelism error between the projection of the alignment prism on a cardinal installation plane and a cardinal orientation plane, and beta is a parallelism error between the projection of the alignment prism on the cardinal orientation plane and the cardinal installation plane.

Description

technical field [0001] The invention belongs to the technical field of error measurement, and in particular relates to a method for measuring the installation error of an aiming prism. Background technique [0002] The inertial navigation system is the main navigation system of large unmanned aerial vehicles such as launch vehicles. The aiming prism installed on the inertial group is the collimation target when it is aiming orienting. location requirements. [0003] The installation error of the aiming prism includes the following two items, such as figure 1 Shown: [0004] α: the parallelism or perpendicularity error of the aiming prism relative to the positioning reference around the X axis; [0005] β: The parallelism error of the aiming prism around the Z axis relative to the installation reference. [0006] These two errors will directly affect the accuracy of aiming and orientation, so it is very necessary to measure them accurately. [0007] However, in the past,...

AI Technical Summary

Problems solved by technology

In this way, the installation error of the scope and the installation error of the inertial instrument are tested according to different benchmarks during calibration, and the installation error of the scope is not fully reflected in the coordinate system of the navigation system.

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