Universal ranging code generator of GLONASS and GPS open navigation signals

GNSS signals are modulated by various ranging codes. The codes spread the signals' spectrums and help to measure propagation delays. There are plenty of signal types in modern systems, and, as a result, any navigation receiver must be able to generate different codes: Gold codes, maximum length sequences, Kasami codes and so on. The pluralism of codes causes the multiplicity of generators and additional receiver channel's complexity. This paper proposes a universal ranging code generator for GLONASS and GPS open service signals. The generator is an adjastable structure, which can be run-time reconfigurated for any signal type. It covers both the legacy and modernized signals and can be applied to other radio systems. The paper reviews the proposed generator, enumerates initialization parameters, shares experimental results and a programmable logic utilization analysis.