PoSAT-1, the first Portuguese satellite, was launched into orbit on September 26, 1993, from the Kourou Space Centre, French Guiana.
PoSAT-1 was an earth observation and technology demonstration mission. It carried two imagers, one with a wide field of view with 2 km ground resolution, the second narrow field imager provided 200m ground resolution. It also carried a Cosmic Ray Experiment and a Digital Signal Processing Experiment.
PoSAT-1 was the first microsatellite using GPS for on-board orbit determination.