Iridium

Iridium is a LEO satellite constellation which provides high-quality voice and data connections across the entire planet. The constellation was originally…

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Signal-to-Noise Ratio (SNR)

Overview Signal-to-Noise Ratio (SNR) is a measure used to directly compare the strength of a signal relative to background noise. [1]…

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Quadrature Amplitude Modulation (QAM)

Quadrature Amplitude Modulation (QAM) is the combination and modulation of two signals which have a 90º phase shift from one another.…

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Space Data Highway

The Space Data Highway (SDH) is a service operated by Airbus that uses the European Data Relay System (EDRS) to provide…

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ARTES

The European Space Agency’s Advanced Research in Telecommunication Systems (ESA’s ARTES) is a program focused on developing products and services for…

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U.S. Spaceforce

The United States Space Force (USSF), formerly the Air Force Space Command (AFSC), is the branch of the United States military…

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ScyLight

ScyLight is a program run by the European Space Agency (ESA) with the purpose to address innovative optical communications technologies for…

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Coherent Orthogonal Optical Frequency Division Multiplexing (CO-OFDM)

Coherent Orthogonal Optical Frequency Division Multiplexing (CO-OFDM) a type of WDM technology that uses the mathematical principle of orthogonality to send…

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Satellite-to-Ground Links (SGL)

A Satellite-to-Ground Link (SGL) describes the communication between a satellite and a ground station. If the ground station is transmitting the…

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Pulse Code Modulation (PCM)

Pulse Code Modulation (PCM) is a digital modulation technique used to convert analog information into a binary sequence. Each digit in…

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