the signals of the individual satellites (with identical carrier frequency) can be distinguished by means of special codes (with gps, these are known as c/a codes). information on time and satellite orbit is contained in the navigation data emitted by each satellite. in this case, the c/a codes are used as spreading codes (similar to cdma systems) for the navigation data.
each gps satellite emits an individual navigation data sequence spread by the c/a code assigned to it at the carrier frequency l1=1.57542 ghz (civilian gps). a signal of this type, which allows basic receiver function tests to be carried out, can be generated by smiq for one satellite.