Principle of operation satellite signal

A GPS satellite signal contains three different kinds of information:
a pseudorandom code, ephemeris data and almanac data.
The pseudorandom code is the Identification code of the satellite, which on a GPS receiver is displayed as a number. Ephemeris data contains information about the status of the satellite (healthy or unhealthy), current date and time. The almanac data informs the GPS receiver where each satellite is positioned at any time.
The satellite transmitting the data contains orbital information for that satellite, and for every other satellite in the system.