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Error calibration method of uniaxial north seeker

An error calibration and north finder technology, applied in the field of inertial navigation, can solve the problems of incapable error model and calibration method calibration and compensation, etc.

Active Publication Date: 2016-04-20
BEIJING INST OF AEROSPACE CONTROL DEVICES
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AI Technical Summary

Problems solved by technology

Different from the traditional inertial navigation system with three gyroscopes and three plus meters, the single-axis north finder is only equipped with a single gyroscope and a single accelerometer, which cannot be calibrated and compensated according to the existing error model and calibration method, so the system must be re-analyzed To establish the error model and error calibration method suitable for single-axis north finder

Method used

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  • Error calibration method of uniaxial north seeker
  • Error calibration method of uniaxial north seeker
  • Error calibration method of uniaxial north seeker

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Embodiment

[0131] 1). Install the single-axis north finder on the turntable so that the load system coincides with each axis of the turntable. Start the north finder to control the OXYZ of the single-axis north finder to rotate around the OZ axis, so that the OY axis is locked at the zero position. Adjust the three-axis turntable to make the single-axis north finder system OX b Y b Z b Placed in 4 different positions, the average value of the pulse number of the sampling gyroscope at Δt=60s, as shown in Table 1.

[0132] Table 1 Four-position test sampling data

[0133]

[0134] And calculate the instrument system OXYZ and carrier system OX b Y b Z b The zero deflection angle Δφ=23.441571°;

[0135] 2). Adjust the three-axis turntable so that the single-axis north finder instrument system OXYZ is statically placed in 10 different positions, and collect the pulse numbers of the gyroscope and accelerometer after Δt=60s, as shown in Table 2.

[0136] Table 2 Ten position test sampling data

[0137]...

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Abstract

An error calibration method of an uniaxial north seeker comprises the following steps: firstly driving a rotary table to carry out four-position testing, and calibrating control drift angle between an instrument system and a carrier system of the uniaxial north seeker; then using the instrument system of the north seeker as a calibration coordinate system and controlling the rotary table to carry out corresponding position and rate testing; and finally finishing calculation of each error coefficient according to an error model of the uniaxial north seeker. The problem of indeterminate angle relation between the carrier system and the instrument system of the uniaxial north seeker is solved, and by the simple uniaxial north seeker's error compensation model and position and rate calibration method, error calibration of the uniaxial north seeker is realized. The calibration method is less time-consuming, has simple calculation and can be used to rapidly complete calibration test.

Description

Technical field [0001] The invention provides an error calibration method of a single-axis north finder, which is suitable for the occasion of using a single gyroscope and a single accelerometer for north finding, and belongs to the technical field of inertial navigation. Background technique [0002] The single-axis north finder is composed of a single gyroscope, a single accelerometer and a corresponding rotating mechanism device. The gyroscope and accelerometer are installed on the body of the north finder. The two ends of the body are equipped with an encoder and a rotating mechanism, which are controlled by a control algorithm. The rotating mechanism drives the main body to rotate in multiple positions, and then uses the output data of the gyroscope and accelerometer at each position to perform north finding calculation. [0003] The single-axis north finder takes the gyroscope and accelerometer data sampling based on the main instrument system, but the output of the north-see...

Claims

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C25/005
Inventor 郭涛张浩曾宪超靳猛管伟涛蒋鸿翔纪文涛
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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