Article Published: July 8, 2014
Article Published: July 8, 2014
Astrobotic Technology and Masten Space Systems announced today that the Astrobotic Autolanding System (AAS) successfully directed the Xombie vertical-takeoff vertical-landing suborbital rocket in a closed-loop test on June 20, 2014. In this technology demonstration, a computer vision system scanned the landscape, selected a landing spot, and directed a rocket-powered lander to a safe touchdown point, all without a human operator. The flight test was funded by the Flight Opportunities Program of NASA's Space Technology Mission Directorate and conducted at the Mojave Air and Space Port in Mojave, CA.
Future NASA and commercial missions will likely target destinations with challenging topography and limited communication, such as unmapped asteroids, surface rendezvous sites for sample return, and terrain features like polar peaks, crater rims, and skylights on Mars and the Moon. The Astrobotic Autolanding System (AAS) autonomously selects a landing location for a robotic spacecraft to safely land at a precise location, a capability that is critical for landing in such hazardous terrain.
Unlike typical drone landings, which rely on GPS, the AAS uses a technique called Terrain Relative Navigation to precisely track the spacecraft's location and attitude using only cameras and an inertial measurement unit (IMU). This is necessary in environments where GPS is not available, like the Moon. The AAS then uses LIDAR to detect hazards and select a landing point. "Conceptually, this is like the Apollo missions where the astronauts navigated to a safe landing by looking out the window of the LEM,” said Kevin Peterson, Astrobotic’s CTO. “In this case, we have an onboard computer instead of an astronaut, and the cameras, IMU (Inertial Measurement Unit), and software are so precise that they can track the craft's location to within a few meters."
Developing navigation and hazard avoidance for a self-landing, rocket-powered spacecraft on Earth is challenging, due to the need to test in the same operating conditions that the system would encounter in a planetary landing. Astrobotic and Masten collaborated on a framework that enabled the test flight without prior knowledge of exactly where the rocket would choose to land. Astrobotic’s AAS scanned the landscape and selected a safe landing point. Masten’s onboard flight system received input from the Astrobotic vision and navigation system, validated the input, and accepted the selection of a path to the touchdown point. The flexible architecture enables flight testing while simultaneously limiting risk to vehicle, payload, and people. The successful flight was the capstone of only a few months of work together.
Masten’s CEO Sean Mahoney said, “Today was a great demonstration of how a rocket powered lander can select a safe landing site without human intervention. There are so many innovations on display in this flight campaign from both teams that it really drives home the reality that barriers to space access are falling.”
Masten’s terrestrial rocket testbed next takes to flight later this year in support of future rocket landing technologies, while the company continues to build the next generation of vertical take off/vertical landing vehicles.