Self-contained navigation method for measurement of earth ultraviolet sensor

An autonomous navigation and sensor technology, applied in directions such as integrated navigators, can solve problems such as improving navigation accuracy and large linearization errors
CN102506876BActive Publication Date: 2014-07-02BEIJING INST OF CONTROL ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING INST OF CONTROL ENG
Publication Date
2014-07-02

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Abstract

The invention relates to a self-contained navigation method for measurement of an earth ultraviolet sensor, which comprises the following steps of: initializing: utilizing satellite injection information to supply a state initial value X~1 and a covariance initial value P~1 outlier of a satellite at a starting moment, accumulating geocentric vector information and earth apparent radius information obtained by the ultraviolet sensor for a specified period of time, and then utilizing an outlier eliminating algorithm to eliminate the outlier in the information; batch processing: performing a least square method on the geocentric vector information and the earth apparent radius information after the outlier is eliminated, and calculating a state estimation X`k and a covariance estimation Pk of the satellite at an ending moment of observation; unscented transformation: utilizing the unscented transformation to realize the time updating of the state and the covariance, obtaining a state forecast X~(k+1) and covariance forecast P~(k+1) of the satellite at the next ending moment of observation; and recursion: continuously accumulating the geocentric vector information and the earth apparent radius information for a period of time, and repeating the steps and performing continuous recursion and calculation, thereby continuously obtaining the estimation of the state of the satellite. According to the method, the precision and the stability of a navigation system are increased.
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Description

technical field

[0001] The invention belongs to the field of autonomous navigation of spacecraft, and relates to an autonomous navigation method for earth ultraviolet sensor measurement. Background technique

[0002] The earth's ultraviolet sensor can detect the image of the entire edge of the earth, and use a large number of edge point information to fit the geometric center of the image, so as to obtain the measurement data of the geocentric vector and the apparent radius of the earth. At the same time, the ultraviolet sensor can also be sensitive to stellar radiation, providing satellite Attitude information relative to inertial space. Utilizing the rich measurement information of the earth's ultraviolet sensor can completely realize the autonomous navigation of the earth satellite, thereby improving the autonomy and autonomous survivability of the satellite, and at the same time helping to reduce the satellite's dependence on the ground system.

[0003] The measurement ...

Claims

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