Description

The NSS ACS solution recommends Combining the data from the MEMS gyros with a stellar gyro as this achieves precision rate knowledge with no drift, allowing exceptional performance during eclipse periods at a fraction of the cost of a star mapper solution. The +/-0.5 degree accurate sun sensors and precision magnetometer provide an absolute pointing solution when sunlit. In eclipse, the attitude is propagated by the gyro combination, with the stellar gyro permitting a drift of typically less than 0.1 degree throughout the entirety of this orbit phase. Furthermore, a GPS receiver can also be integrated into the NSS ACS board, with the addition of a mezzanine board, to allow orbit position knowledge. This increases the fidelity of the magnetometer by improving position knowledge compared to an orbit propagator. The NSS GPS is independently controlled through a UART interface with all other functionality controlled via a single I2C interface. Ultimately, the NSS ACS board can be supplied either partially populated, for example with sensors and actuators for simple magnetic stabilization or safe mode control, or as a complete solution. Depending on the functionality required by the client, a fit-for-purpose board can be customized. Additionally, each of the NSS sensors and actuators, as well as the GPS receiver, are available individually to complement a client’s existing suite of components. Individual datasheets for these products are available on request.