A GNSS (GLOBAL NAVIGATION SATELLITE SYSTEM) RECEIVER APPARATUS COMPRISING A GNSS PSEUDO RANDOM NOISE DELAYED SEQUENCE GENERATOR, CORRESPONDING GENERATION METHOD AND COMPUTER PROGRAM PRODUCT

摘要

A GNSS (Global Navigation Satellite System) receiver apparatus, said receiver (100) comprisinga tracking module (5), comprising at least one tracking channel (TRK_i) comprisinga bank of correlators (25) receving in-phase (I_w) and quadrature (Qw) versions of a received signal (I_T; Q_T),a GNSS Pseudo Random Noise sequence generator (23) generating a Pseudo Random Noise sequence (PS) at a code frequency (Fchip) set by a code Numerical Controlled Oscillator (32) comprised in the tracking channel (TRK_i) determining a code rate,a GNSS Pseudo Random Noise delayed sequence generator (24; 44) configured to generate, on the basis of a Pseudo Random Noise sequence (PS) received from said GNSS Pseudo Random Noise sequence generator (23), at least one punctual (P), one early (E1, E2; E1...EK) and one delayed (L1, L2; L1...LK) replica of said Pseudo Random Noise sequence (PS),said GNSS Pseudo Random Noise delayed sequence generator (24; 44) comprising at least a first and second delay lines arranged as shift registers (245, 246; 441, 445), comprising a determined number (N) of flip-flops (FF0...FF15, FF16...FF31; FF0...FFN-1, FFN...FF2N-1) arranged in series and identifying taps at their output and said Pseudo Random Noise sequence (PS) being brought as input of the first register (245; 441), taps of said registers (245, 246; 441, 445) being selected as early (E1, E2; E1...EK) and delayed (L1, L2; L1...LK) replicas of said Pseudo Random Noise sequence (PS) on the basis of selection signal issued by a control logic (41) of the receiver (100),;The apparatus comprises a circuit arrangement (32, 36, 37; 32, 42, 43, 45) configured to generate an enable signal (EN) fed to an enable input of said flip-flops (FF0...FF15, FF16...FF31; FF0...FFN-1, FFN...FF2N-1), said enable signal (EN) operating at a selectable enable frequency (1/T_en).