<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _getsatname(self):
 """ Get the satellite name used in the rsr-reader, from the platform and number """

        if self.platform_name.startswith("Meteosat"):
            return self.platform_name
        else:
            raise NotImplementedError(
                'Platform {0} not yet supported...'.format(self.platform_name))