This paper discusses an evolvable deep space relay architecture that provides
communications and navigation services for spacecraft in the Mars vicinity and in the inner …

The recent exploration initiatives for robotic and human missions to the Moon and Mars
require long-term communications and navigation infrastructures that provide accurate and …

Currently, it is more efficient to use LEO small spacecraft as radio control points to determine
the compliance of the radiation parameters of electronic means with the relevant norms and …

Lunar descent and landing requires accurate position, velocity, and timing (PVT) knowledge
in real-time. This paper introduces the use of Joint Doppler and Ranging (JDR) fused with …

Joint Doppler and Ranging (JDR) is a relative Doppler and range-based positioning method
that can localize a surface user with a minimal navigation infrastructure. The traditional …

Currently, deep space missions beyond the Moon are all robotic missions. For their
communication needs, these missions either rely on large Earth-based antenna apertures …