Precision measuring method of high-precision star sensor

Abstract

The invention discloses a precision measuring method of a high-precision star sensor, and the method comprises the steps of fixing the star sensor for storing a star map on the earth and ensuring that a rolling shaft of the star sensor points to zenith; obtaining a first optimum posture matrix qi of the star sensor and an actual shooting time corresponding to the star map according to a direction vector of a navigation star under a coordinate system of the star sensor and a direction vector under the J2000.0 right-angle coordinate system; obtaining a second optimum posture matrix according to qi; obtaining a precision measuring conversion matrix associated to the star sensor according to the actual shooting time of the star sensor and the precession, nutation and autoroatation of the earth; obtaining a precision measuring matrix according to the second optimum posture matrix and the precision measuring conversion matrix; determining a three-axis pointing vector of the star sensor according to the precision measuring matrix; obtaining an angle respectively between three optimum pointing vectors of the star sensor at the actual shooting time and an X-axis vector, a Y-axis vector and a Z-axis vector of the star sensor according to the three-axis pointing vector; and obtaining the rolling precision and the pointing precision of the star sensor according to the angles.

Description

technical field [0001] The invention belongs to the technical field of attitude sensors, in particular to a precision measurement method of a high-precision star sensor. Background technique [0002] With the advantages of high precision, low power consumption, and small size, star sensors have become the most competitive attitude-sensing devices for spacecraft. At present, the attitude determination accuracy of star sensors can reach 10″, and the accuracy of some types of star sensors can even reach 1″ level. High precision is the key factor for the rapid development and wide application of star sensors. With the increasing accuracy of star sensors, higher requirements are put forward for accuracy expression and measurement methods. Traditional test methods are mainly based on star simulators and precision turntables. The position accuracy of turntables needs to be an order of magnitude higher than that of star sensors, that is, to reach the sub-arcsecond level. This kind ...

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Problems solved by technology

[0005] For this reason, the present invention provides a kind of precision measurement method of high-precision star sensor, the precision measurement method of described high-precision star sensor can realize the measurement of roll precision and pointing precision of star sensor easily and solve the problem of traditional The test method of the test method is complicated to operate and requires expensive precision turntables and star simulators. At the same time, the measurement results of the precision measurement method of the high-precision star sensor are more accurate and authentic than the turntable measurement method, and the test accuracy Can meet the requirements of the star sensor

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