UPC
Pronunciation: U-P-C
Also written as: UPC — Uplink Power Control
An automated system used at a satellite ground station to increase transmit power during signal attenuation events such as rain fade, compensating for path losses and maintaining link quality.
Full Definition
UPC systems monitor the received beacon level or downlink signal quality at a ground station and automatically increase the HPA output power when atmospheric attenuation degrades the uplink. By counteracting rain fade in real time, UPC helps maintain the satellite's received signal level and preserves the link margin without operator intervention. UPC is specified as a range (e.g., 0 to 6 dB of dynamic control) and is a key mitigation technique for Ku-band and Ka-band earth stations. Editors should note the acronym UPC is specific to satellite operations; it must not be confused with the Universal Product Code in retail contexts. Expand on first use.
Usage
Usage note: Expand on first use: 'Uplink Power Control (UPC)'. Ensure the satellite-communications meaning is clear in any document where retail or general IT acronyms might also appear. Note the related term ULPC, sometimes used as an alternate acronym for the same function.
In Context
- "The earth station's UPC system increased transmit power by 4.5 dB during the storm, maintaining the required EIRP at the satellite." — Station operations log
- "The service specification required UPC with a dynamic range of at least 6 dB to support 99.95% annual availability." — Service-level agreement