Real-Time Hardware-in-the-loop Test-Rig for Space Rider‘S Drop Test

The Space Rider project, led by the European Space Agency (ESA) with Thales Alenia Space as the prime contractor for the reentry module, seeks to develop an uncrewed, reusable re-entry spacecraft for various orbital missions. The final phase of the Space Rider mission consists in a guided parafoil descent and precision landing. In this framework, the Italian Aerospace Research Center (CIRA) is responsible for the design and implementation of a system-level test for the in-flight verification of the Descent and Landing phase of the mission. The test article is a full-scale vehicle model fully replicating the Space Rider Re-entry Module in shape, mass distribution and size; furthermore, it is also representative of some interfaces/layout arrangement and functioning of critical subsystem as Descent System, Landing System, Mechanism and GN&C algorithms. A Hardware-in-the-Loop (HIL) setup has been prepared to perform the Space Rider drop test for the validation on the test article avionics and software and consequently the overall Descent and Landing System. Rapid Prototyping with Automatic Code Generation techniques are used to ensure a rapid and efficient process in the software development. The HIL test-rig for Space Rider Drop Test integrates hardware and software components in a simulation environment, allowing real-time data acquisition from the onboard sensors and other equipment, such as an inertial navigation unit, which provides critical data related to the spacecraft’s attitude, velocity, and position measurements. The mission computers process these data and execute the commands to manage the parafoil shape during the descent and landing phases, according to the Parafoil GN&C logics. Additionally, the setup includes strain gauges and accelerometers that measure the forces experienced during landing. Finally, the air data sensors monitor the atmospheric conditions during the whole flight. The HIL test-rig is crucial to test and validate the software for the acquisition of real-time data from the spacecraft’s sensors and the proper functioning of uplink systems. It ensures that commands are accurately sent to the parafoil and other equipment controlled by the mission computer software. By sending as external input pre-programmed test cases scenarios, the test verifies the correct behavior of the avionics during all the mission phases such as the parafoil's deployment and control mechanisms, ensuring they function as intended. The data collected during the drop test are invaluable for identifying and addressing potential issues in the Descent and Landing system, contributing to the overall risk reduction and success of the Space Rider mission. The successful implementation of these tests highlights the importance of HIL testing in the Space Rider mission development lifecycle, enhancing the robustness and reliability of one of the most critical subsystems. The paper will present the insights gained from the HIL testing phase, which are crucial for the continued development and success of the Space Rider project, ensuring the spacecraft’s readiness for operational missions.