Tuesday night’s Plenary Session at ION GNSS+ took attendees to space with a high-flying presentation on NASA’s planetary exploration endeavors by keynote speaker James L. Green, director of Planetary Science for NASA. He touched on most of the planets, with the July fly-by of Pluto by the New Horizons probe the climax of his talk.
Following the keynote, the ION GNSS+ program chairs shared insights on the topics to be covered at the conference in a lighthearted — and very fast-moving — format. Each presenter had only five minutes to describe their program track. Afterward, they were invited to the set of “The ION GNSS+ Show,” where moderator (and GPS World editor and publisher) Alan Cameron asked them a few questions.
This year’s conference feature panels of industry experts, policy updates, the world’s largest GNSS commercial exhibit and more than 300 technical presentations presented through both Systems and Application Tracks and Peer-Reviewed Tracks.
Program chairs who gave lightning talks before joining Alan on the couch, and their topics, were: Paul McBurney, GopherHush Corp., Mass-Market Applications; Sandra Kennedy, NovAtel, High Performance & Safety-Critical Applications; Andre Hauschild, German Aerospace Center, System Updates, Plans and Policies; Zainab Syed InvenSense, Multisensor Navigation and Applications; Olivier Julien, ENAC, Algorithms and Methods; and Grace Gao, University of Illinois at Urbana-Champaign, Advanced GNSS Technologies.
Planetary Navigation. During his keynote address, Green took the audience on a journey navigating through the solar system. He explained that NASA’s goals are to advance our knowledge of the origin and history of the solar system, discover the potential for life elsewhere, and assess what hazards humans may face in exploring space. First stop was our nearest neighbor, the Moon, which was explored in 2012 by NASA’s Gravity Recovery and Interior Laboratory (GRAIL) spacecraft. GRAIL uncovered the origin of massive invisible regions that make the moon’s gravity uneven, a phenomenon that affects the operations of lunar-orbiting spacecraft. Because of GRAIL’s findings, spacecraft on missions to other celestial bodies can navigate with greater precision in the future.
Moving on to Mars, Green shared the background and successes of the Curiosity rover, which is still on Mars researching the Red Planet. Curiosity also took a selfie.
Green said Andy Weir’s novel The Martian, which has been made into a movie that will be out in October, is a realistic depiction of what exploring the hostile red planet would be like for humans.
The New Horizons flyby of Pluto drew several audience questions following Green’s presentation. With an orbit of 248 years, it was a challenge to determine the precise navigation route to the Solar System’s outermost planet, especially when travel at 16 kilometers a second could spell disaster if the probe encountered any space debris — even a particle the size of a grain of sand could end the mission. Mission control constantly reassessed the spacecraft’s trajectory using imagery from the Hubble space telescope and then New Horizons itself.
