# [TECH] Satellite Communications

**Satellite Communications** uses spacecraft in geosynchronous and low Earth orbit to relay telecommunications signals globally, enabling intercontinental telephony, television broadcasting, internet, and navigation.

## Overview

Arthur C. Clarke proposed geosynchronous communication satellites in 1945. Telstar 1 (1962, AT&T/Bell Labs) was the first active communication satellite. INTELSAT I (Early Bird, 1965) carried 240 telephone circuits. Ku-band direct broadcast (1970s–80s) enabled satellite TV. Low Earth Orbit constellations (Iridium 1998; Starlink 2019–) provide low-latency broadband globally. GPS and Earth observation satellites are also communication-technology descendants.

## Key Actors

- **Companies**: INTELSAT (1964), AT&T/Bell Labs, Hughes Aircraft, SES (1985), SpaceX/Starlink (2019), OneWeb
- **Inventors**: Harold Rosen (1926–2017, geosynchronous satellite pioneer)

## Key Patents

- Rosen, H. et al. US Patent 3,653,627 (1972) — spin-stabilised geostationary satellite

## Economic Value

Global satellite communications market: **USD 125 billion/year** (2023, NSR). Including satellite manufacturing, launch, and services. Starlink alone targets USD 30B/year revenue by 2025 (SpaceX internal projection).

## Notes

NSR *Satellite Communications Market Report* 2023. GPS (separate node) adds USD 2T+/year but is primarily navigation rather than communications.

## What This Enables

- **[TECH] Internet & World Wide Web** — Satellite links provided early internet backbone; Starlink (2019–) now extends broadband to rural and maritime users.
- **[TECH] Mobile Phones & Smartphones** — Satellite positioning (GPS) and backhaul links support cellular infrastructure worldwide.

## Discovery Character
⏎
**Surprise level**: Moderate — Arthur C. Clarke's 1945 proposal for geostationary communication satellites was technically prescient and was immediately recognised as feasible in principle. The surprise was speed: Clarke's vision was realised in 20 years.
⏎
**Mode**: Systematic-engineering following theoretical vision. Clarke was a systems engineer who did the orbital mechanics calculation correctly in 1945. Telstar 1 (1962) and Early Bird/INTELSAT I (1965) were systematic government-commercial engineering programs. No serendipity; exceptional execution of a stated plan.
⏎
# Parents

* [TECH] Rocket & Space Launch
* [TECH] Radio & Wireless Communication
* [TECH] Rocket & Space Launch