• USING GPS RECEIVER 1PPS OUTPUT TO VERIFY TIME STAMP ACCURACY AND MEASURE PROPAGATION DELAY

      Knudtson, Kevin; Moreno, Antonio; NASA Armstrong Flight Research Center; NASA Armstrong Flight Research Center, Arcata Associates Inc. (International Foundation for Telemetering, 2018-11)
      A simple pulse overlay circuit using a logic OR gate was developed to overlay a precise leading edge 1 pulse per second time reference marker from a global positioning system receiver onto a non-return -to- zero-level pulse code modulation telemetry data stream to validate time stamp accuracy and measure propagation delay in telemetry equipment.