Galileo uses tiered codes, a combination of medium length primary code with a smaller length secondary code.Since it uses an FDMA approach, low cross-correlation characteristics are not so critical for this system. GLONASS uses only one maximum length code.
GPS L1 C/A uses Gold codes that are actually a combination of two maximum length codes.For this purpose, several types of codes are used, and some examples are given here (for further information on the codes used by each system, refer to the respective SIS ICDs): Pseudo-Random Noise (PRN) Codes - also called ranging codes - are a sequence of pulses that are used by GNSS to spread the spectrum of the transmitted signal. 4 Effect of the Modulation on Auto-Correlation Function.
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