NASA'S SPACE COMMUNICATIONS AND NAVIGATION:WHAT'S HAPPENING TODAY?

摘要

NASA's long-range vision for enhancing its three Space Communications and Navigation (SCaN) networks—the Near Earth Network (NEN), Deep Space Network (DSN), and Space Network (SN)—includes three efforts underway today: 1. SN Modernization: A $600 million project is replacing 30 year-old equipment to convert an old-fashioned analog design to a state-of-the-art digital design. Simultaneously, a $1.5 billion project is buying three Tracking and Data Relay Satellites (TDRS) to replace aging 20 year-old satellites.