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Definition

Bit Error Rate

BER

The fraction of received bits that differ from the transmitted bits. Common targets are 10⁻⁵ for telemetry and 10⁻⁹ for data, achieved by combining link margin with error-correcting codes.

Related terms

Bus

The structural and functional core of a spacecraft that houses and supports the payload and all subsystems. Includes pow...

Budget (Mass/Power/Link)

An accounting of resource allocation across spacecraft subsystems with margins. Mass budgets track weight, power budgets...

Ballistic Coefficient

A measure of how an object's mass and shape resist atmospheric drag, calculated as mass divided by (drag coefficient tim...

Beta Angle

The angle between the orbital plane and the Sun vector. Determines the fraction of an orbit spent in eclipse and drives ...

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