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Antreasian, P.

Publications and source records attributed to Antreasian, P..

At least 19 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS2019

OSIRIS-REx Gravity Field Estimates for Bennu Using Spacecraft and Natural Particle Tracking Data

The current best estimates of Bennu’s gravity field will be presented, based on the independent solutions from four different teams involved on the OSIRIS-REx mission. The discovery of ejected particles about Bennu that may remain in orbit for several days or more provide a unique opportunity to probe the gravity field to higher degree and order than possible by using conventional spacecraft tracking. However, the non-gravitational forces acting on these particles must also be characterized, and their impact on solution accuracy must be assessed. This talk will present the latest results from the mission, incorporating spacecraft tracking from the lowest orbit in which the satellite will be during the mission.

Scheeres, D. J.↗
NASA NTRS2006

Use of Very Long Baseline Array Interferometric Data for Spacecraft Navigation

The main VLBI technique that is used at JPL is known as the Delta Differential One-way Ranging ((Delta)DOR). Two DSN antennas simultaneously track a source, and alternate between sources. The signals recorded at the antennas from each source are correlated to obtain the delay in arrival to the two antennas, and the delays are differenced to remove common-source errors. An alternative technique is to use carrier phase differences between antennas. This is routinely done by the Very Large Baseline Array (VLBA) as part of source imaging. The VLBA capabilities are used for scientific research, but also have the potential to be used for navigation. Two main experiments were performed with the VLBA and JPL spacecraft. This paper describes and analyzes these experiments and discusses the possible uses of VLBA tracking for spacecraft navigation.

Very Large Baseline Array (VLBA)↗
NASA NTRS2002

The Mars Odyssey navigation experience

The 2001 Mars Odyssey Mission has returned an Orbiter to Mars to map the planet and search for water. This paper will present an overview of the Navigation performance, with a comparison of the pre-launch requirements and expected performance to the in-flight experience.

Mars Odyssey navigation↗
NASA NTRS2000

Navigation, Altimetry, Asteroids

The impact of using altimeter range measurements as an observation type for navigation of spacecraft about small bodies is evaluated.

Navigation Altimetry Asteroids↗
NASA NTRS1999

Challenges in Near Navigation

The Near Earth Asteroid Rendezvous (NEAR) Discovery mission is the first to send a spacecraft to rendezvous with and orbit about an asteroid.

NEAR Discovery navigation↗