Abstract: A GNSS receiver (100) receives radio signals (S(SV)) transmitted from an active set of signal sources (SV1, SV2, SV3, SV5) and based thereon produces position/time related data (DPT). The receiver (100) has a tracking channel resource for each signal source (SV1, SV2, SV3, SV5) in the active set, and the tracking channel resources process the radio signals (S(SV)) in parallel with respect to a real-time signal data rate of the signals. The receiver (100) also includes a signal-source database (140), a signal-masking database (150) and a control unit (130). The signal-source database (140) describes the movements of the signal sources (SV1, SV2, SV3, SV4, SV5) over time relative to a given reference frame, and the signal-masking database (150) reflects, for positions (P) within a predefined geographic area, visibility/blockage to the sky with respect to a direct line of sight in terms of spatial sectors (M1(P), M2(P) M3(P)).

Abstract: The programmable graphics processor processing a signal from a global navigation satellite system (“GNSS”); has a rasterizer unit, a pixel shader unit and a memory unit. GNSS satellite, received signal converted into a digitized form of the received signal, and transformed by a programmable graphics processor, wherein an array of a corresponding data of the digitized form signal is stored in the memory unit and operated by the pixel shader unit forming a resulting array, written into the memory unit at the first address (see FIG. 3). A first address and values of the endpoints of the array of the corresponding data of the digitized form signal are supplied to the rasterizer unit. The rasterizer unit interpolates values between values of endpoints of the array. The values of the endpoints and the interpolated values of the array correspond to addresses in the memory unit for the array of the corresponding data of the digitized form signal.