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Definition

Preliminary Design Review

PDR

A phase gate review that evaluates the preliminary design to confirm it meets requirements and the design approach is feasible. Typically occurs at the end of Phase B.

Related terms

Payload

The instrument or system that performs the mission's primary function. For Earth observation: cameras or sensors. For co...

Perigee

The point in an orbit closest to the central body. For Earth orbits, the lowest altitude above Earth's surface....

Phase Gate

A review milestone where a program's readiness to proceed to the next development phase is evaluated. Standard gates inc...

Power Budget

An accounting of electrical power generation (solar panels, batteries) and consumption (subsystems, payload, heaters) ac...

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