A5049914036- Planetary Science and Exploration
- Astro and Planetary Science
- Spacecraft Design and Technology
- Space Satellite Systems and Control
- Astronomical Observations and Instrumentation
- Advanced Optical Sensing Technologies
- Inertial Sensor and Navigation
- Particle Accelerators and Free-Electron Lasers
- Geophysics and Gravity Measurements
- Particle accelerators and beam dynamics
- Satellite Communication Systems
- Gyrotron and Vacuum Electronics Research
- GNSS positioning and interference
- Space Exploration and Technology
- CCD and CMOS Imaging Sensors
- Spacecraft Dynamics and Control
- Optical Systems and Laser Technology
- Ionosphere and magnetosphere dynamics
- Remote Sensing and LiDAR Applications
- 3D Surveying and Cultural Heritage
- Spacecraft and Cryogenic Technologies
- Satellite Image Processing and Photogrammetry
- Laser-induced spectroscopy and plasma
- Geology and Paleoclimatology Research
- Laser Design and Applications
Japan Aerospace Exploration Agency
2011-2024
Institute of Space and Astronautical Science
2011-2024
Meijo University
2024
The Graduate University for Advanced Studies, SOKENDAI
2020-2022
RIKEN Advanced Science Institute
2014
International Society of Automation
2011
Johns Hopkins University Applied Physics Laboratory
2006
University of Aizu
2006
Jet Propulsion Laboratory
2006
Gifu University
2004
Hayabusa2 at the asteroid Ryugu Asteroids fall to Earth in form of meteorites, but these provide little information about their origins. The Japanese mission is designed collect samples directly from surface an and return them for laboratory analysis. Three papers this issue describe team's study near-Earth carbonaceous 162173 Ryugu, which spacecraft arrived June 2018 (see Perspective by Wurm). Watanabe et al. measured asteroid's mass, shape, density, showing that it a “rubble pile” loose...
Collecting a sample of asteroid Ryugu The Hayabusa2 spacecraft recently traveled to the nearby carbonaceous collect samples and return them Earth for laboratory analysis. Morota et al. describe Hayabusa2's first collection, taken during brief touchdown on Ryugu's surface. Close-up images video sampling process allowed authors investigate surface colors morphology small scale. Relating these craters stratigraphy constrains evolution Ryugu. conclude that experienced prior period strong solar...
The ranging instrument aboard the Hayabusa spacecraft measured surface topography of asteroid 25143 Itokawa and its mass. A typical rough area is similar in roughness to debris located on interior wall a large crater 433 Eros, which suggests structure ejecta Eros. mass was estimated as (3.58 +/- 0.18) x 10(10) kilograms, implying bulk density (1.95 0.14) grams per cubic centimeter for volume (1.84 0.09) 10(7) meters porosity approximately 40%, that angular sands, when assuming an LL (low...
The Japanese lunar orbiter SELENE discovered three giant holes, Marius Hills Hole, Mare Tranquillitatis and Ingenii that exceed tens of meters in diameter depth, are possible lava tube skylights. These lunar-hole structures possibly underlying tubes have great significance for science potential utilization, thus should be priority targets future exploration. It is essential to acquire detailed information on terrain around the multi-layered outcrops inner walls debris thermal conditions...
Abstract The precise orbit of the Hayabusa2 spacecraft with respect to asteroid Ryugu is dynamically determined using data sets collected by spacecraft’s onboard laser altimeter (LIght Detection And Ranging, LIDAR) and automated image tracking (AIT). LIDAR range AIT angular play complementary roles because sensitive line-of-sight direction from Ryugu, while directions perpendicular it. Using AIT, all six components initial state vector can be derived stably, which difficult achieve only or...
Three-dimensional (3D) image sensors have many applications, including enabling autonomous vehicles to avoid obstacles and providing guidance, navigation, control for spacecraft immediately before landing on a celestial body. Flash LIDAR is system that can acquire 3D by emitting diffuse pulsed laser beam, hence suitable both obstacle detection terrain measurement. In the used LIDAR, photosensor array time measurement integrated circuit are vertically bonded. Here, we report results of...
The Jupiter Icy Moons Explorer (JUICE) is a science mission led by the European Space Agency, being developed for launch in 2023. Ganymede Laser Altimeter (GALA) an instrument onboard JUICE, whose main scientific goals are to understand ice tectonics based on topographic data, subsurface structure measuring tidal response, and small-scale roughness albedo of surface. In addition, from perspective astrobiology, it imperative study ocean scientifically. development GALA has proceeded through...
We report results of a laser link experiment between altimeter called light detection and ranging (LIDAR) aboard Hayabusa2 ground-based satellite stations conducted when the spacecraft was near Earth before after gravity assist operation. Uplink pulses from ground station were successfully detected at distance 6.6 million km, field view direction receiving telescope LIDAR determined in frame. The intensities received signals measured, budget to confirmed. By detecting two successive pulses,...
The polarimetric cross-talk calibration algorithm proposed by Quegan, which is more general than the one van Zyl, modified to improve SAR calibration. L-band data acquired JAXA/NICT airborne Pi-SAR, including a variety of natural and artificial targets, are calibrated introducing noise imbalance cross-polarized channels into Quegan deriving parameters from areas with low correlation between like observed echoes. achieved enhancement in stability parameter estimation removal over demonstrated...
Abstract An altimeter is a critical instrument in planetary missions, for both safe operations and science activities. We present required specifications link budget calculations light detection ranging (LIDAR) onboard the Martian Moons Exploration (MMX) spacecraft. During mission phase, this LIDAR will continuously measure distance between spacecraft its target. The time-series provides important diagnostic information geomorphological studies. Because MMX sample return mission, must...
HAYABUSA, launched May 2003, is the first Japanese spacecraft to explore small asteroid Itokawa. HAYABUSA had rendezvous Itokawa in three month 2005 and touched down it twice sample material from it. LIDAR a one of important navigation sensor measure distance between 50km 50m. operated months was estimated have shot more than 4 million laser pulses supplied ranging data system approach 30 m.