Galileo HAS Initial Service for spaceborne orbit determination & time synchronisation: HAUT-S

Kurzfassung

The satellite sector is expanding fast, fueled by miniaturization and rising demand for Earth observation, communications, and positioning services. The growth of satellite constellations is pushing operators towards greater onboard autonomy, while reducing reliance on continuous ground contact. At the same time, LEO's dynamic environment makes precise orbit determination and accurate time knowledge critical to mission performance and to emerging navigation and positioning concepts. To address this need, Spaceopal and the German Aerospace Center (DLR) have partnered on a technology transfer effort to develop HAUT-S, a commercial space-qualified payload providing real-time onboard Orbit Determination and Time Synchronization for LEO, low-MEO, CubeSats, and sounding rockets. By delivering precise orbit and time information directly onboard, HAUT-S reduces latency and enables advanced mission concepts such as LEO-based positioning, navigation, and timing, applications that depend on satellites knowing their orbit and time with high precision even when ground contact is limited. As a market-ready product, HAUT-S combines orbit determination and time synchronization into a single building block and targets real-time onboard 3D accuracy of about one decimeter, leveraging Galileo HAS Initial Service corrections to improve broadcast ephemeris quality. An optional chip scale atomic clock can be integrated directly on the main electronics board to provide GNSS time-synchronized 10 MHz and 1 PPS outputs for other subsystems. The product is designed for resilience and includes fault tolerance and redundancy, interference detection and mitigation, and anti-spoofing via Galileo Open Service Navigation Message Authentication. HAUT-S offers multiple outputs (observables, orbit products, PPS, 10 MHz) and supports configurable orbit determinations setups (constellations, signals, corrections), interfaces for Optical Time Transfer and Ranging inputs, and upgradable software with spare processing capacity for future functions. HAUT-S is developed using a rigorous COTS EEE strategy combined with countermeasures for the space environment. The qualification has demonstrated performance, vibration, and thermal-vacuum qualification for space environment as well as antenna calibration for enhanced navigation chain characterization.