Using GPS Receivers 1PPS Output to Verify Time Stamp Accuracy and Measure Propagation Delay

Knudtson, Kevin ; Moreno, Antonio

关键词: PCM TELEMETRY;    GLOBAL POSITIONING SYSTEM;    PULSE CODE MODULATION;    CIRCUIT DIAGRAMS;    TIME SIGNALS;   

RP-ID  :  AFRC-E-DAA-TN59860

学科分类：工程和技术（综合）

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

A simple Pulse Overlay (PO) circuit using a logic OR gate was developed to overlay a precise leading edge 1 Pulse Per Second (1PPS) time reference marker from a GPS receiver onto a Non-Return -to- Zero-Level (NRZ-L) Pulse Code Modulation (PCM) telemetry data stream to validate time stamp accuracy and measure propagation delay (PD) in telemetry equipment.