An NBS Phase Noise Measurement System Built for Frequency Domain Measurements Associated with the Global Positioning System,

摘要

A self-contained system is described which was constructed to perform phase noise measurements for the first phase of the Global Positioning System (GPS). It is capable of evaluating a pair of similar oscillators or a single oscillator and a frequency synthesizer using the phase-lock technique. Three features have been included to simplify the operation of the instrument:internal circuitry automatically detects an out-of-lock condition;an optimized second order phase-lock loop reduces phase error by a factor of 100,000over a first order loop;selection of operating mode is made by a single front panel switch.