1 PPS

To control the 1PPS signal, a specialized IP core, PPSTex, is implemented in the RITM SDR USRP architecture. This module provides synchronous capture of an external signal when it is present at the input, and in case of loss of the reference pulse, it switches to autonomous generation mode. At the same time, the kernel restores the time grid based on statistical data on the periods of the 1PPS external signal obtained during previous iterations. In addition, the module supports the generation and broadcasting of its own 1PPS signal to the interface output.

The IP core parameters are controlled through the functions set_ip_core() and get_ip_core(). For more information, see SDR registers.