There is a growing interest in the use of legacy terrestrial Global Positioning System (GPS)
signals to determine the precise positioning and timing onboard a lunar satellite. Unlike prior …

To support the increasing interest in lunar exploration, the future lunar users will require
precise position, velocity, and timing (PVT) services on the Moon. Active efforts are being …

The development of a robust navigation infrastructure in cis-lunar space is crucial for the
coming new era of advanced lunar exploration. NASA has set a goal to develop an …

The ability of a deep space spacecraft to estimate its position, velocity, and clock errors
without external clock error estimation is investigated. A novel approach to onboard …

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 …

For the future lunar navigation satellite system (LNSS), a GPS-like constellation for the
Moon, NASA has expressed interest in using a smallsat platform. However, many design …

We describe our Lunar Navigation Satellite System (LNSS) that was designed to provide the
PNT service at the Lunar South Pole region. Our LNSS is composed of eight satellites …

After more than fifty years since the Apollo program, we are encountering a revived, second
Space Race with international space agencies seeking to not only return humans to the …

Precision relative navigation is an essential aspect of spacecraft formation flying missions,
both from an operational and a scientific point of view. When using GPS as a relative …

Recently, there has been significant interest in providing positioning, navigation, and timing
(PNT) capability from low-Earth orbit (LEO) satellites. Providing PNT independently of …