Automatic picture transmission

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automatic picture transmission[edit | edit source]

(Abbreviated APT.) Low-resolution analog transmission of AVHRR data from polar orbiting satellites.

Two channels of reduced-resolution (4 km) data are continuously transmitted using analog VHF signals (137 MHz) at reduced rates (120 lines per minute), allowing use of simple, low-cost ground station equipment for APT reception. APT was initiated with the TIROS satellite launched in December 1963.


(Abbreviated APT.) Low-resolution analog transmission of AVHRR data from polar orbiting satellites.

Abbreviation for automatic picture transmission.

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