Abstract: A method, performed by at least one apparatus, is provided that includes obtaining or determining one or more stability parameters for a specific satellite. The method also includes determining, at least partially based on the one or more stability parameters for the specific satellite, one or more transmission characteristics for transmitting correction data for the specific satellite. A corresponding apparatus and a computer readable storage medium are also provided.

Abstract: A method, apparatus and computer readable storage medium are provided for determining whether or not GNSS navigation data are potentially manipulated. In the context of a method, GNSS reference data is received that represents one or more GNSS signals observed by a reference receiver at a reference position. The method also receives GNSS navigation data and determines, at least partially based on said GNSS reference data and the GNSS navigation data, a position estimate of said reference position. The method further includes determining, at least partially based on said reference position and the position estimate of said reference position, whether or not the GNSS navigation data are potentially manipulated.

Abstract: A method, performed by at least one apparatus, is provided that includes obtaining or determining one or more stability parameters for a specific satellite. The method also includes determining, at least partially based on the one or more stability parameters for the specific satellite, one or more transmission characteristics for transmitting correction data for the specific satellite. A corresponding apparatus and a computer readable storage medium are also provided.

Abstract: A method performed by a mobile device and a corresponding apparatus are provided with the method including receiving first GNSS navigation data containing ephemeris data of at least one GNSS satellite and/or clock data of the at least one GNSS satellite for a first time period and determining extended first GNSS navigation data at least partially based on the first GNSS navigation data. The extended first GNSS navigation data contains ephemeris data and/or clock data of the at least one GNSS satellite for an extension time period. The method further includes receiving second GNSS navigation data containing ephemeris data of the at least one GNSS satellite and/or clock data of the at least one GNSS satellite for a second time period and determining, at least partially based on the extended first GNSS navigation data, whether or not the second GNSS navigation data are potentially manipulated.

Abstract: A method, apparatus and computer readable storage medium are provided for determining whether or not GNSS navigation data are potentially manipulated. In the context of a method, GNSS reference data is received that represents one or more GNSS signals observed by a reference receiver at a reference position. The method also receives GNSS navigation data and determines, at least partially based on said GNSS reference data and the GNSS navigation data, a position estimate of said reference position. The method further includes determining, at least partially based on said reference position and the position estimate of said reference position, whether or not the GNSS navigation data are potentially manipulated.

Abstract: A method, apparatus and computer readable storage medium are provided to determine whether or not said at least one GNSS signal is potentially manipulated. In the context of a method, at least one global navigation satellite system, GNSS, signal related to a first GNSS system time is received. The method determines at least one system time difference between the first GNSS system time and a reference time at least partially based on said at least one GNSS signal. The method also obtains at least one reference system time difference and then determines, at least partially based on the at least one system time difference and the at least one reference system time difference, whether or not said at least one GNSS signal is potentially manipulated.

Abstract: A method, apparatus and computer readable storage medium are provided for determining whether GNSS related positioning of a mobile device is expected or unexpected. In the context of a method, a representative of GNSS positioning accuracy for a mobile device is determined at least partially based on observation GNSS data and on correctional GNSS data. The method also includes determining, at least partially based on the representative of GNSS positioning accuracy, whether a GNSS related positioning is expected or unexpected for positioning of the mobile device.