Space Network

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This article is about the NASA spacecraft communication system. For networks in space, see
Space (Canadian TV channel). For other networks names "Space", see Space (disambiguation)
.

Space Network (SN) is a NASA program that combines space and ground elements to support spacecraft communications in Earth vicinity. The SN Project Office at Goddard Space Flight Center (GSFC) manages the SN, which consists of:[1]

  • The geosynchronous
    Tracking and Data Relay Satellites
    (TDRS),
  • Supporting ground terminal systems,
  • The
    Bilateration Ranging and Transponder System
    (BRTS),
  • Merritt Island Launch Annex
    (MILA) relay,
  • Network Control Center Data System
    (NCCDS).

Satellite generations

Location of TDRS as of March 2019
First-generation Tracking and Data Relay Satellite (F1–F7)
Second-generation Tracking and Data Relay Satellite (F8–F10 also known as H, I, J)

Tracking and Data Relay Satellite
(TDRS) currently consists of first-generation (F1–F7), and second-generation (F8–F10) satellites.

The space segment of the SN consists of up to six operational relay satellites in geosynchronous orbit. These

communications satellites are allocated longitudes for relaying forward and return service signals to and from customers, any entity with an Earth-orbiting satellite that has an agreement with SN to use its communications services, for data transfer and tracking. An additional TDRS, F1, provides dedicated support to the National Science Foundation
(NSF) through the use of the WSC Alternate Relay Terminal (WART). Additional spare TDRSs may be in geosynchronous orbit.

All first-generation TDRSs (F1–F7, also known as TDRS A–G) carry functionally identical payloads and all second-generation TDRSs (F8–F10, also known as TDRS H–J) carry functionally identical payloads.[citation needed]

A third generation, TDRS K, L, and M were launched between 2013–2017.

The figures identify the pertinent communications components and associated parameters of the orbiting relay platforms.

Coverage

For spacecraft operating in a

Deep Space Network
or their own custom, dedicated networks.

Network Control Center Data System

The Network Control Center Data System (NCCDS) is an element of the SN ground segment.

TDRS
communications and tracking events. Additionally, the NCCDS notifies affected customers of scheduled system outages so that Mission Operation Centers (MOCs) can properly plan mission activities. Upon MOC request, the NCCDS provides operational performance information (such as data presence monitoring indicators and data quality monitoring data) on scheduled services during actual support to determine if conditions exist that will affect data quality.

The NCCDS issues Network Advisory Messages (NAMs) to provide up-to-date information on network conditions and constraints. These messages are accessible via the NCCDS active NAM web site. The

TDRS
spacecraft.


See also

References

  1. ^ NASA, Exploration and Space Communications Projects Division; Goddard Space Flight Center (August 2007). Space Network User's Guide (SNUG), 2.3.2.1, Dedicated Ground Elements (Rev 9 ed.). National Aeronautics and Space Administration. 450-SNUG.
  2. ^ NASA, Exploration and Space Communications Projects Division; Goddard Space Flight Center (August 2007). Space Network User's Guide (SNUG), 1.1.2, Scope, and 2.3.1.2, TDRS Line-of-Sight Coverage (Rev 9 ed.). National Aeronautics and Space Administration. 450-SNUG.
  3. ^ Space Network User's Guide (SNUG), 450-SNUG, Rev 9.

External links

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