A5050155037- Astro and Planetary Science
- Advanced Frequency and Time Standards
- Planetary Science and Exploration
- Spacecraft Dynamics and Control
- Atomic and Subatomic Physics Research
- Spacecraft Design and Technology
- Inertial Sensor and Navigation
- Space Satellite Systems and Control
- Ionosphere and magnetosphere dynamics
- Satellite Communication Systems
- Target Tracking and Data Fusion in Sensor Networks
- Opportunistic and Delay-Tolerant Networks
- GNSS positioning and interference
- Space Science and Extraterrestrial Life
- Geophysics and Gravity Measurements
- Distributed systems and fault tolerance
- Space Exploration and Technology
- Space exploration and regulation
- Spacecraft and Cryogenic Technologies
- Quantum chaos and dynamical systems
- Stellar, planetary, and galactic studies
- Pulsars and Gravitational Waves Research
- Atmospheric Ozone and Climate
- Radio Astronomy Observations and Technology
- Solar and Space Plasma Dynamics
Jet Propulsion Laboratory
2010-2024
California Institute of Technology
2002-2020
Bell (Canada)
2005
Purdue University West Lafayette
1996-2000
Deep understanding of planetary habitability requires identifying key factors that govern the surface environment over time. Venus is ultimate control case for how Earth developed and maintained conditions suited to life. very likely had elements essential such as past water a dynamo. Tectonism volcanism, which create chemical disequilibrium, persist today. What caused diverge down different evolutionary paths? VERITAS would foundational, co-registered data sets high-resolution topography,...
This paper presents the initial results of lander and rover localization topographic mapping MER 2003 mission (by Sol 225 for Spirit 206 Opportunity). The has traversed a distance 3.2 km (actual traveled instead odometry) Opportunity at 1.2 km. We localized landers in Gusev Crater on Meridiani Planum using two-way Doppler radio positioning technology cartographic triangulations through landmarks visible both orbital ground images. Additional high-resolution images were taken to verify...
Routine use of one-way radiometric tracking for deep space navigation and radio science is not possible today because spacecraft frequency time references that state-of-the-art ultrastable oscillators introduce errors from their intrinsic drift instability on timescales past 100 s. The Deep Space Atomic Clock (DSAC), currently under development as a NASA Technology Demonstration Mission, an advanced prototype space-flight suitable, mercury-ion atomic clock can provide unprecedented stability...
There are many different atomic frequency standard technologies but only few meet the demanding performance, reliability, size, mass, and power constraints required for space operation. The Jet Propulsion Laboratory is developing a linear ion-trap-based mercury ion clock, referred to as DSAC (Deep-Space Atomic Clock) under NASA's Technology Demonstration Mission program. This clock expected provide new capability with broad application space-based navigation science. A one-year flight...
Covers advancements in spacecraft and tactical strategic missile systems, including subsystem design application, mission analysis, materials structures, developments space sciences, processing manufacturing, operations, applications of technologies to other fields.
Recent advances with space navigation technologies developed by NASA in space-based atomic clocks and pulsar X-ray combined past successes autonomous using optical imaging, brings to the forefront need compare optical, radiometric, pulsar-based measurements a common set of assumptions techniques. This review article examines these data types two different ways. First, simplified deep orbit determination problem is posed that captures key features dynamics geometry, then each type...
Eccentric and inclined resonant orbits exhibit complex motions that have the potential to become chaotic. Furthermore, these may also destabilize classical control strategies. Understanding mechanisms cause such occur is critical. Previous research has determined interaction between tesseral harmonics can produce chaotic responses in semi-major axis stroboscope mean node (primary variables of interest for groundtrack control) an orbit. However, previous work did not include effects...
Covers advancements in spacecraft and tactical strategic missile systems, including subsystem design application, mission analysis, materials structures, developments space sciences, processing manufacturing, operations, applications of technologies to other fields.
The Cislunar Autonomous Positioning System Technology Operations and Navigation Experiment (CAPSTONE) mission is an upcoming lunar flight demonstration, with a targeted launch in early 2022. primary objective of the to test out navigation operations same Near Rectilinear Halo Orbit (NRHO) that will be utilized by NASA's Lunar Gateway. In addition this objective, CAPSTONE contains dedicated board for (CAPS), framework autonomous or near-autonomous cislunar space developed Advanced Space....
Mean element propagation of perturbed two body orbits has as its mathematical basis the averaging theory nonlinear dynamical systems. elements define an orbit's long-term evolution characteristics consisting both secular and long-period effects. Using theory, a near-identity transformation can be found that transforms between mean their osculating counterparts augment with short period The ability to perform conversion is necessary so orbit design conducted in either or effectively converted...
NASA's Deep Space Atomic Clock mission is developing a small, highly stable mercury ion atomic clock with an Allan deviation of at most 1e-14 one day, and current estimates near 3e-15. This stability enables one-way radiometric tracking data accuracy equivalent to and, in certain conditions, better than two-way deep space data; allowing shift more efficient flexible navigation architecture. DSAC-enabled will benefit radio science by increasing the quantity quality data. Additionally, DSAC...
Mars has become the focus of an unprecedented series missions spanning many years, involving numerous nations and evolving from robotic to human exploration. Elements will be dispersed widely in longitude latitude over surface Mars. Some elements like rovers, balloons airplanes mobile. Other sample canisters orbit Finally manned sites require broadband, 24hr connectivity earth. The challenge been develop architecture technology roadmap that anticipate needs this mission set. NASA's Jet...
Pinpoint landing (defined for the purpose of this discussion as within 1km a preselected target) is key Advanced Entry, Descent and Landing (EDL) technology future Mars landers.
Guidance, Navigation, and Control (GN&C) is the measurement control of spacecraft position, velocity, attitude in support mission objectives. This paper provides an overview a preliminary design GN&C system Lunar Lander Altair. Key functions performed by various phases will first be described. A set placeholder sensors that needed to these next To meet Crew safety requirements, there must high degrees redundancy selected sensor configuration. Two sets thrusters, one on Ascent Module (AM)...
Chip scale atomic clocks (CSACs) have the potential to provide CubeSat missions with precision timekeeping capabilities support onboard radiometric tracking, reducing dependence on ground support. This work considers a baseline orbit determination (OD) scenario for low-Earth-orbit CubeSat, one-way measurements made using CSAC as timing reference. Methods simulating and estimating stochastic signature temperature-induced frequency variation are presented. Navigation clock estimation...
Abstract With the advent of Deep Space Atomic Clock, operationally accurate and reliable one-way radiometric data sent from a radio beacon (i.e., DSN antenna or other spacecraft ) collected using spacecraft’s receiver enables development use autonomous navigation. This work examines fusion with optical (i.e. OpNav) to yield robust trajectory solutions that include selected model reductions computationally efficient navigation algorithms can be readily adopted for onboard, The methodology is...