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Definition

Specific Impulse

Isp

A measure of propulsion system efficiency, equal to thrust divided by propellant mass flow rate (in seconds). Higher Isp means more delta-V per kilogram of propellant.

Related terms

Space Mission Analysis and DesignSMAD

The standard methodology for spacecraft mission engineering, covering the full lifecycle from concept studies through op...

Sun-Synchronous OrbitSSO

A near-polar LEO orbit where the orbital plane precesses at the same rate as Earth's revolution around the Sun. Provides...

Suspect Link

A traceability link flagged for review because the source or destination requirement has been modified. Suspect links in...

System Requirements ReviewSRR

A phase gate review that evaluates whether the system requirements are complete, consistent, and testable before proceed...

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