# Tracking and Data Relay Satellite

> type of communications satellite that forms part of the Tracking and Data Relay Satellite System

**Wikidata**: [Q2166659](https://www.wikidata.org/wiki/Q2166659)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Tracking_and_data_relay_satellite)  
**Source**: https://4ort.xyz/entity/tracking-and-data-relay-satellite

## Summary
A Tracking and Data Relay Satellite (TDRS) is a communications satellite that forms part of NASA's Tracking and Data Relay Satellite System (TDRSS), providing continuous communication links between spacecraft and ground stations. These satellites enable real-time data transmission for NASA missions, including the International Space Station and space shuttle operations.

## Key Facts
- TDRS satellites are operated by NASA as part of the Tracking and Data Relay Satellite System
- The TDRS constellation includes multiple satellites such as TDRS-1 through TDRS-13, with some decommissioned
- TDRS-B was lost during the launch of STS-51-L
- TDRS satellites are classified as communications satellites and spacecraft constellations
- The system provides continuous communication coverage for NASA missions
- TDRS satellites are part of a spacecraft family designed for telecommunications
- The system supports real-time data transmission for space missions

### Q: What is the purpose of Tracking and Data Relay Satellites?
A: TDRS satellites provide continuous communication links between spacecraft and ground stations, enabling real-time data transmission for NASA missions including the International Space Station and space shuttle operations.

### Q: Who operates the Tracking and Data Relay Satellite System?
A: NASA operates the TDRS system as part of its Tracking and Data Relay Satellite System constellation.

### Q: How many TDRS satellites have been launched?
A: Multiple TDRS satellites have been launched, including TDRS-1 through TDRS-13, with some satellites decommissioned and TDRS-B lost during launch.

## Why It Matters
The Tracking and Data Relay Satellite System revolutionized space communications by providing continuous, high-capacity data links between spacecraft and ground stations. Before TDRS, NASA relied on a limited network of ground-based tracking stations, which meant spacecraft could only communicate when passing over specific locations. TDRS satellites orbit in geostationary positions, creating a constellation that enables constant communication with orbiting spacecraft. This system is critical for modern space operations, supporting everything from scientific data transmission to astronaut communications and spacecraft navigation. The TDRS network has become an essential infrastructure component for NASA's space program, enabling the complex operations required for human spaceflight, scientific research, and satellite management.

## Notable For
- Provides continuous communication coverage for NASA missions
- Enables real-time data transmission from spacecraft to ground stations
- Supports International Space Station and space shuttle communications
- Forms a complete spacecraft constellation for telecommunications
- Revolutionized space communications by eliminating reliance on ground-based tracking stations

## Body
### System Overview
The Tracking and Data Relay Satellite System consists of multiple communications satellites working together to provide continuous coverage for NASA missions. These satellites operate in geostationary orbit, positioned to maintain constant line-of-sight with both ground stations and orbiting spacecraft.

### Satellite Variants
The TDRS constellation includes numerous satellites with designations from TDRS-1 through TDRS-13. Some satellites have been decommissioned over time, while others continue to provide active service. TDRS-B represents a notable failure, having been lost during the STS-51-L launch.

### Technical Capabilities
TDRS satellites function as part of a spacecraft family and constellation, designed specifically for telecommunications purposes. They enable high-capacity data transmission and support various NASA operations including scientific data relay, voice communications, and spacecraft tracking.

### Operational Role
The system provides critical infrastructure for NASA's space operations, supporting the International Space Station, space shuttle missions, and other spacecraft requiring continuous communication links. This eliminates the previous limitations of ground-based tracking station networks.

### Classification and Standards
TDRS satellites are classified as communications satellites and are part of a larger spacecraft family. They operate under NASA's management and conform to international telecommunications standards for space-based communication systems.

## Schema Markup
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## References

1. Freebase Data Dumps. 2013
2. BabelNet