In this article, we generate accurate global positioning system (GPS) legacy navigation
(LNAV) orbital parameters to provide truth satellite positions and satellite clock biases for …

Abstract Since 2013, the International GNSS Service (IGS) real-time service (RTS) has been
providing precise orbit and clock corrections for ten years, which enables real-time …

In this research study we describe our last effort in further improving the achievable Global
Navigation Satellite System (GNSS) based navigation performance in an Earth-Moon …

This paper deals with the problem of real-time onboard relative positioning of low-Earth-orbit
spacecraft over long baselines using the Global Positioning System. Large intersatellite …

There are multiple Global Navigation Satellite Systems (GNSS's), comprising over 100
navigation satellites in the Earth's medium and high orbits. Most of these satellites have …

There is growing interest in designing a future lunar navigation satellite system (LNSS) while
utilizing a SmallSat platform. However, many design decisions, eg, regarding the satellite …

A high-fidelity simulation is developed to test the theory that relative range and rangerate
measurements between a satellite in a geosynchronous orbit and a satellite in orbit about …

This paper shows the architecture of a Lunar Radio Navigation System (LRNS) constituted
by a small constellation of satellites supported from Earth by a dedicated network of small …

The Lunar GNSS Receiver Experiment (LuGRE) is a joint NASA-Italian Space Agency flight
demonstration payload that will fly onboard the Blue Ghost Mission 1 (BGM1) lunar lander to …

Recent advances have revealed new ways to use relative satellite-to-satellite tracking (SST)
data to perform absolute navigation of one or more satellites. The Global Positioning System …