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Gyro-assisted method for improving output frequency of star sensor

A technology of star sensor and output frequency is applied in the field of increasing the output frequency of star sensor based on the aid of gyroscope, which can solve the problem of low data update frequency and achieve the effect of increasing the update frequency

Active Publication Date: 2018-07-31
SOUTHEAST UNIV
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Problems solved by technology

At present, the star sensor has the problem of low data update frequency, and the data update rate is an important indicator of the star sensor

Method used

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  • Gyro-assisted method for improving output frequency of star sensor
  • Gyro-assisted method for improving output frequency of star sensor
  • Gyro-assisted method for improving output frequency of star sensor

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Embodiment 1

[0025] Such as figure 1 , the invention discloses a method for improving the output frequency of a star sensor based on gyroscope assistance, comprising the following steps:

[0026] (1) The star sensor outputs the star map of the current frame (time t), and extracts the position of the star point in the star map of the current frame.

[0027] (2) According to the angular velocity information output by the gyroscope, predict the position of the star point in the star map of the current frame at time t+Δt, assuming that the 3×3-dimensional attitude matrix of the star sensor in the celestial coordinate system is A, and the navigation star S i The direction vector in the celestial coordinate system is v i , the direction vector can be measured by the star sensor, and its corresponding image vector in the star sensor coordinate system can be expressed as w i . The position of the center point of the star sensor in the star map plane is expressed as (x 0 ,y 0 ), Navstar S i ...

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Abstract

The invention discloses a gyro-assisted method for improving the output frequency of a star sensor, the method comprises the following steps: (1) the star sensor outputs a current frame star map, andthe position of a star point in the current frame star map are extracted; (2) the position of the star point of the current frame star map is predicted in a next-moment star map according to angular velocity information outputted by a gyro; (3) posture information of a carrier where the star sensor is in is calculated and outputted. The position of the star point of the current frame star map canbe predicted in the next-moment star map according to the angular velocity information outputted by the gyro, and the data updating frequency of the star sensor can be improved.

Description

technical field [0001] The invention relates to a method for increasing the output frequency of a star sensor, in particular to a method for increasing the output frequency of a star sensor based on gyroscope assistance. Background technique [0002] In recent years, with the rapid development of navigation technology, the requirements for positioning accuracy are getting higher and higher, so the research on attitude measurement sensors that ensure high attitude accuracy and stability of the carrier is becoming more and more urgent. The star sensor is an important measurement component in the attitude control system of the carrier, and it is also an optical attitude sensor widely used at present; it uses stars in space as a reference source for attitude measurement, and outputs the direction of the optical axis of the sensor in the inertial reference system. The attitude determination accuracy of the star sensor is high, and it can provide inertial attitude information at t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 陈熙源柳笛邵鑫方琳
Owner SOUTHEAST UNIV
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