It generates a maximal-length sequence of length elements.Ī Gold code is the sum of two maximum-length sequences. Each C/A code is generated using a tapped linear feedback shift register (LFSR) Section 14.1. The pseudorandom noise (PRN) codes transmitted by the GPS satellites are deterministic sequences with noise like properties. They are also referred to as pseudo-random noise sequences, or simply PRN sequences, because of their characteristics. They are often referred to as Gold codes, as Robert Gold described them in 1967 see Gold (1967). The spreading sequences used as C/A codes in GPS belong to a unique family of sequences. We restrict ourselves to the C/A code sequences, as we deal only with L1 signals in this topic. In this section, the spreading sequences used in GPS are described.
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