A test method for evaluating the stability of the north reference for inertial group calibration

Abstract

The invention discloses a method for evaluating and testing the stability of a north reference prism used for inertial group calibration, comprising: (1) using a theodolite to measure the azimuth of the Polaris to obtain the true north direction, and lead it to the prism on the pier, that is, the mirror surface of the north reference prism. Carry out collimation, and fix the northward reference prism on the pier position after collimation as the northward reference; (2) use the theodolite to guide the northward reference determined by the above-mentioned northward reference prism to the prism on the turntable of the inertial group calibration equipment, that is, the northward positioning prism, And after the theodolite is aligned with the north positioning prism mirror, it is used as the positioning north of the inertial group calibration equipment; (3) the inertial group calibration equipment performs multiple north reference data collections according to the positioning north, and obtains the stability of the north reference after processing Evaluate the test results. The method of the invention solves the problem of stability monitoring of the northward reference, and effectively provides technical support for the inertial system; the test method is safe and reliable in operation, and the test curve is intuitive and accurate.

Description

technical field [0001] The invention belongs to the technical field of inertia, and in particular relates to a north reference stability evaluation test method for inertial group calibration, which is suitable for evaluating and testing the influence of various factors on north reference drift in a high-precision inertial system, so as to ensure inertial group calibration The accuracy and reliability of the data can be applied to technical fields such as aerospace, aviation, and ships. Background technique [0002] Inertial group (also known as inertial measurement combination or inertial measurement combination) is a component sensitive to acceleration and gyro angular rate, which is used to provide measurement information for guidance / navigation and other stable systems. Whether its accuracy meets the requirements of design technical indicators will be directly related to Product performance. The accuracy of the true north reference provided by the calibration system is t...

AI Technical Summary

Problems solved by technology

However, due to changes in related factors such as ground pulsation, pier subsidence, distortion, environmental temperature and humidity changes, the solidification material of the bracket on the isolation pier and the prism, and the interval time, etc., the error drift will be brought to the northward datum, thus making the calibration The value is not accurate enough (the accuracy requirement of the high-precision inertial system for the north reference is generally not greater than 1′), which leads to unreliable measurement results of the inertial group and cannot meet the accuracy requirements of the product

[0004] However, there is currently no test method for periodic testing and evaluation of northbound datums to analyze and determine the impact of various factors on northbound datum drift

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