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Definition

Doppler Shift

The change in observed frequency due to relative motion between transmitter and receiver. Critical for LEO ground station tracking, where shifts can exceed ±50 kHz at S-band.

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Related terms

Delta-VΔV

The change in velocity required for an orbital maneuver. A fundamental measure of the propulsive effort needed to transf...

Downlink

Data transmission from a spacecraft to a ground station. Downlink budget analysis determines if the signal is strong eno...

Ka-band

A radio frequency band from 26.5 to 40 GHz, increasingly used for high-bandwidth satellite downlinks. Higher gain than X...

Free Space Path LossFSPL

The signal attenuation between an isotropic transmitter and isotropic receiver in free space, dependent on distance and ...

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