Globalstar Network is a satellite constellation for satellite phones and low-speed data communications. It is similar to the Iridium satellite constellation.

No. A constellation is an arrangement of stars. The moon is a natural satellite of Earth.

The constellation of GPS satellites usually rotates about 20 000km altitude. Each satellite is about the size of a small truck, plus its solar sails for electricity generation. About 24 satellites per constellation, and constellations exist or are under construction for the US, the Soviets, the EU, and for China.

Nowadays they contain an atomic clock, and effectively give out accurate time signals which may be decoded on the earth's surface.

GPS, or more exactly GNSS, is a constellation of satellites that sends waves to the earth. To learn more, you can read this blog on GPS signal detection and accuracy. cyclope.dev

It is a northern constellation.