A technology assessment of alternative communications systems for the space exploration initiative

Abstract

Telecommunications, Navigation, and Information Management (TNIM) services are vital to accomplish the ambitious goals of the Space Exploration Initiative (SEI). This paper provides a technology assessment of four alternative lunar and Mars operational TNIM systems based on detailed communications link analyses. The four alternative systems range from a minimum to a fully enhanced capability and use frequencies from S-band, through Ka-band, and up to optical wavelengths. Included are technology development schedules as they relate to present SEI mission architecture time frames. NASA FORM lS26 OCT e6

Integrated Cryogenic Satellite Communications Cross-link Receiver Experiment

“…To close such a link would require a receiver noise figure (0.5 dB) achievable only through cryogenic cooling, even with 10 and 20 meter transmitter and receiver antennas, respectively. 3 High data rate cross-links for the next generation of satellite systems would benefit likewise. A cross-link employing a cooled receiver, not unlike the one described here, would use less overall spacecraft power since transmitter power could be conserved.…”