February 27, 2017

Bus

The Myriade-Evolutions bus is designed for a typical 7-year mission, in low orbit ranging from 500 km to 800 km and Sun-synchronous orbit (SSO) for all local time of ascending node (LTAN).

The bus structure is a parallelepiped rectangle with dimensions of 98 x 102 x 58 cm. It is composed of:

An interface ring with the launcher, supporting the propulsion module and the rest of the main structure
4 lateral honeycomb panels to accommodate equipment able to be opened out for integration operations
4 aluminium corners to give the structure extra rigidity
An upper honeycomb panel to accommodate the payload

A bi-compliant hydrazine and green propellant chemical propulsion module, based on 4 1-N motors, will assure the LEOP operations, operational orbit stationkeeping and de-orbiting at the end of the mission.

The avionics (computers and attitude control system) relies heavily on the avionics of the existing series at Airbus Defence & Space and Thales Alenia Space to maximize synergies across the range of low-orbit satellites.

The power system comprises a solar array made up of two wings, a battery and a new compact power regulation and distribution unit.

These elements are complemented by a new S-band transceiver for TM/TC, as well as a mass memory and a high data rate emitter in X band for the processing of the mission data flux.

These developments are compliant with the French Space Operation Act (FSOA) and cover functions such as end-of-life passivation (notably depressurization of the fuell tank and electrical passivation).