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Direct Sequence Spread Spectrum Experiments using GNU Radio Companion SDR

This paper describes Software Defined Radio (SDR) developments using an Ettus Research [1] Universal Software Radio Peripheral (USRP). This work follows the development of the GNU Radio Companion (GRC) to construct a transceiver for Direct Spread Spectrum communication. This transceiver is a component of a low-cost satellite modem being developed for Two-Way Satellite Time and Frequency Transfer (TWSTFT) [2] and ranging measurement experiments. Features that distinguish the GRC are described, and performance indicators provided.