An On-line Calibration Method Applied to the Inertial Group of the Missile

Abstract

The invention discloses an online calibration method applied to the inertial group on the missile, which includes: the carrier runs along the planned running path, and obtains several groups of satellite receiver output information and inertial group pulse output information with the same number of groups; After completion, the first set of pure inertial navigation information is obtained according to the acquired initial navigation information and the first set of inertial group pulse output information, and the filtering time is updated; when the first set of pure inertial navigation information and filtering time update are completed, according to the first set The satellite receiver output information constructs the observation equation and performs filtering measurement update to obtain the state estimation of the upper inertial group in the current group; according to the next group of satellite receiver output information and the next group of inertial group pulse output information, repeat the above steps, The state estimation of the next group is calculated until the state estimation of all groups is calculated; the basic calibration parameters are corrected and updated according to the state estimation of the last group, and the execution is repeated multiple times to obtain the final basic calibration parameters and complete online calibration.

Description

technical field [0001] The invention relates to the technical field of aerospace strapdown inertial navigation, in particular to an online calibration method applied to inertial groups on missiles. Background technique [0002] The strapdown inertial navigation system has the advantages of short response time, high reliability, small size, and light weight. It is widely used in military and civilian navigation fields such as aircraft, ships, and missiles. It has important national defense significance and huge economic benefits. [0003] The calibration technology of inertial measurement combination is one of the core technologies in the field of inertial navigation. It is a kind of error identification technology, that is, to establish the error model of inertial devices and inertial navigation system, and solve the error items in the error model through a series of experiments. , and then compensate the error through the software algorithm. The calibration result of IMU d...

AI Technical Summary

Problems solved by technology

[0004] Inertial measurement combined calibration methods are generally discrete calibration and system-level calibration; as traditional calibration methods, discrete calibration and system-level calibration need to disassemble the upper inertial group and perform calibration on a special turntable in the laboratory, and Calibration time is long

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