By the way, if you happen to use UNIX on the Macintosh, try the open command in a Terminal window. For instance, if the current working directory has a file named poodle.jpg.

Then, the most statement is about component of terminal receiver system, named data receiving Card, these introductions describes its design principle and implementation.

This paper introduces a user terminal equipment for the double-satellite positioning system. The terminal, named continuous navigation passive positioning system, is based on Rubidium atomic clock.