A server satellite that is parked in a stable distant retrograde orbit (DRO) in the vicinity of the
Moon can provide navigation service for satellites in the Earth–Moon system. In this study, X …

Millisecond X-ray pulsars are rapidly rotating neutron stars that emit broadband
electromagnetic radiation, including X-rays. These emissions can appear as pulsations to …

Onboard measurements of periodic x-ray signals from highly stable, rapidly spinning stars
called pulsars, enable determination of spacecraft position, velocity, and attitude states. Due …

Autonomous orbit determination (OD) is a complex process using filtering method to
integrate observation and orbit dynamic model effectively and estimate the position and …

We used one-way laser ranging data from International Laser Ranging Service (ILRS)
ground stations to NASA's Lunar Reconnaissance Orbiter (LRO) for a demonstration of orbit …

This paper presents a concept for the orbit determination and time synchronization (ODTS)
of a lunar radio navigation system. The proposed approach utilizes small ground antennas …

TRADITIONAL space navigation techniques are currently built on assets such as the Global
Positioning System (GPS) and ground stations such as the Deep Space Network (DSN) to …

The accuracy of X-ray pulsar-based navigation is greatly affected by the Doppler effect
caused by the spacecraft orbital motion and the systematic biases introduced by the pulsar …

The Flight Dynamics Facility (FDF) at the NASA Goddard Space Flight Center (GSFC) hosts
the navigation support for the Lunar Reconnaissance Orbiter (LRO). LRO is one of over 30 …

In November 2017, the NASA Goddard Space Flight Center (GSFC) Station Explorer for X-
ray Timing and Navigation Technology (SEXTANT) experiment successfully demonstrated …