The possibility to acquire and track signals for which the PRN code is not public (e.g. as for Galileo Public Regulated Service or any other non-public GNSS service) is of high interest in order to be able to assess, with real field signal, new acquisition and tracking techniques that otherwise can only be assessed with a full GNSS receiver with access to those PRN codes. In this context, the recovery of the unknown PRN codes from low-noise signal recordings (e.g.

Science missions such as SPICA (with the Safari instrument) and ATHENA (with the X-IFU instrument) require a complex cryogenic chain to ensure thermal bath temperatures in the order of 50 mK at the level of their respective detectors. The last cooling stage in these complex chains includes an Adiabatic Demagnetization Refrigerator (ADR) that takes advantage of the fact that the entropy of paramagnetic materials in a magnetic field is lower than when no field is present.

Future spacecraft missions require high accuracy (in relative and absolute kinematics as well as attitude parameters).

The Ka-band frequency (35 GHz) is becoming increasingly attractive for spaceborne remote sensing applications. Unlike other radar bands, the Ka-band enables the development of compact high resolution interferometric instruments and embarking the payloads on a single platform. This creates unique new opportunities in Earth observation science and civil security applications, for instance in monitoring the changing cryosphere, generating high resolution maps of ocean currents and ship and vehicle detection.

This activity is split in different parts focusing on various aspects of the overall methodology: 1) Models and structural analysis development, fidelity and coupling: Noise source models are the starting point of microvibration analysis. Some sources are well known and modelled (e.g. Reaction wheel) but others still require some development. In particular, cryo-cooler and stepper motors models are often key to microvibration performance but are generally based on black-box models coming from test characterization without a model representation of the physical phenomena.

A previous study (TRP Star sensing based safe mode) confirmed the interest of using star tracker as primary sensor in a generic safe mode: versatility, suitability to complex requirements and constraints (e.g.

Intentional and unintentional electromagnetic transmission can interfere with various space-borne receiving systems. Generally, such occasions are called Radio Frequency Interferences (RFI). Reports of RFI problems can be found from many space application domains that use radio receiving systems: Satellite navigation services (such as the Galileo service), telecommunications, Earth Observation, or satellite telemetry, tracking and commanding services.