The Fine Digital Sun Sensor (FDSS) is a high-accuracy sun sensor designed to distinguish the Sun from Earth albedo and other unexpected light sources, providing reliable sun-tracking and attitude-determination data in challenging orbital conditions.

The FDSS captures images of the Sun in less than one millisecond and identifies the Sun independently from other light sources within its field of view. Its image-based sensing capability can also provide additional information, including the albedo vector, supporting enhanced spacecraft attitude determination.

Built using a combination of proven COTS components and space-grade parts, the FDSS offers a robust architecture designed for space applications.

With plug-and-play operation, the sensor integrates its required electronics and processing, eliminating the need for additional external electronic modules and simplifying integration with the spacecraft ADCS.