The Cold Atom Rubidium Interferometer in Orbit for Quantum Accelerometry (CARIOQA) Quantum Pathfinder Mission aims at demonstrating a quantum technology-based accelerometer in space as a precursor for a later use onboard a satellite gravimetry mission. A dedicated satellite will be launched for the Pathfinder Mission in the early 2030s to raise the technology level of the required technologies for applications on operational missions. The Phase A study to investigate the feasibility of this mission has concluded and the Phase B started in October of 2025. We present studies from the Phase A on the relationship between available models of the atmospheric conditions in low Earth orbits and the instrument and satellite design. We examine the impact of drag models on the development of requirements to fulfil the mission objectives. In addition to the demonstration of the functionality of the quantum sensor, the Pathfinder Mission will provide accelerometer measurements in low Earth orbits for the expected mission lifetime of three years. As a scientific objective of the mission, this dataset will be used to derive parameters like thermosphere density or atmospheric crosswinds.