Add GPS Orbital Determination Subroutine

[planetaryeclipse]

To achieve higher accuracy pointing requirements at future points in time, we need to develop orbital determination strategies utilizing a GPS. This GPS comes from the recommendations of the team given at the first CDR given the tight requirements for the QeyNet payload.

Ideally, the GPS alone should be able to generate an orbit although the addition of an IMU might lead to better results given the acceleration of the IMU is to be known. We need a solution using some sort of algorithm or filter to facilitate such determination.

Requirements:

• GPS-only approach for orbital determination
• GPS- and IMU-based approaches for orbital determination