NASA’s Dragonfly completes first full simulated flight ahead of Titan mission

NASA’s Dragonfly mission has completed its most comprehensive simulated flight to date, allowing engineers to test how the rotorcraft’s navigation and flight systems work together ahead of its planned journey to Saturn’s moon Titan.

The test, announced by NASA on Oct 23, was conducted on a computer testbed at the Johns Hopkins Applied Physics Laboratory (APL) in Maryland. It recreated the sequence of events involved in Dragonfly’s first flight, including surveying the terrain, identifying a safe landing site and descending towards it.

The exercise did not involve an actual flight. Instead, it used flight-like computer hardware and simulated sensor inputs to assess the spacecraft’s ability to carry out complex manoeuvres autonomously.

Testing navigation and landing systems together

The simulation integrated Dragonfly’s flight software and avionics with data representing inputs from its navigation cameras, inertial measurement units and lidar system.

Lidar will help the rotorcraft measure terrain altitude and slope and identify potential hazards. Engineers generated simulated terrain for the system and created real-time images resembling the scenes Dragonfly’s cameras are expected to encounter on Titan.

The test brought these elements together in a single sequence, allowing engineers to examine how the systems communicate and respond to information in real time.

Zach Putnam, Dragonfly’s mobility subsystem lead engineer at APL, said the first-flight scenario was particularly challenging because it uses every piece of flight-sensor hardware on the lander.

The team had previously tested individual capabilities incrementally, from spinning a single rotor to performing repositioning and partial scouting manoeuvres. Adding lidar enabled a more comprehensive simulation of the flight and landing sequence.

Why autonomous flight matters on Titan

Dragonfly is designed to travel between locations on Titan, using its rotors to explore the moon’s surface and investigate its chemistry, geology and atmosphere.

Because Titan is so far from Earth, the spacecraft will have to perform flight operations without real-time instructions from mission controllers. Its systems must therefore interpret sensor data, assess the terrain and respond to potential hazards autonomously.

NASA says further tests will include running the first-flight sequence on Dragonfly’s actual flight system, rather than a testbed. Engineers also plan to evaluate other flight profiles and deliberately introduce faults to test how the spacecraft responds when something goes wrong.

These tests are part of the mission’s preparation for launch, currently scheduled no earlier than 2028. Dragonfly is expected to reach Titan in 2034 and conduct a mission lasting approximately three years.

The simulated flight marks a step in testing the systems needed for that mission, but it does not mean the spacecraft has flown on Titan or completed its testing programme.