Method for measuring precision of star sensor and system using the same
US8433515B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2011 |
| Grant date | Apr 30, 2013 |
| Priority date | — |
| Expiry date | Aug 3, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for measuring a precision of a star sensor and a system using the same may be provided. The method may comprise steps of: 1) fixing the star sensor on the Earth; 2) inputting a current time (T) of a measuring start time relative to a J2000.0 time; 3) determining a directional vector of the navigation star in a J2000.0 Cartesian coordinate system at the current time (T) according to a right ascension and a declination of the navigation star in the J2000.0 Cartesian coordinate system and visual movement parameters (α′, δ′) of the navigation star in the direction of the right ascension and the declination which are stored in the star sensor; 4) converting the directional vector of the navigation star in the J2000.0 Cartesian coordinate system into a directional vector of the navigation star in an ecliptic coordinate system; 5) converting the directional vector of the navigation star in the ecliptic coordinate system into a directional vector (vCRFT) of the navigation star in a celestial coordinate system; and 6) converting the directional vector (vCRFT) of the navigation star in the celestial coordinate system into a directional vector (vTRF) of the navigation star in a terre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.