Satellite is a small spacecraft that orbits around the planet. Satellites are used for communication and research. Various foreign advanced civilizations around the galaxies using satellites. Stargate Command placed satellites in orbit P5C-629. Asgard made a disruptor satellite which they lent to the Tau'ri. (SG1: "Gemini")
Goa'uld used spy satellites around the galaxy and even Traveler used spy satellites to find people with ATA gene in Pegasus. (SG1: "Beachhead") (SGA: "Travelers")