Two-Way Satellite Time and Frequency Transfer using an opensource, openhardware Software-Defined Radio platform

Initial results of a portable (multiplatform) opensource, openhardware implementation of a pseudo-random binary number spectrum-spreading framework using Software Defined Radio for Two-Way Satellite Time and Frequency Transfer are given with a description of the hardware and software implementations. Satellite attitude measurements including ranging and velocity, as well as two-way transfer results, are presented.