Satellites, radar and the electrical engineer

Since Sputnik 1 was launched by the Russians in 1957, more than 50 countries have joined the race to launch satellites into orbit from low-earth to geosynchronous orbit (260 to 22,240 miles from earth). Of the more than 3,500 satellites in earth’s orbit, about 1/3 are active while the rest are no longer operating. The business of launching satellites is evolving, however, and the numbers of operational satellites are set to increase by thousands within the next decade.