The Deep Space Network Stability Analyzer

A stability analyzer for testing NASA Deep Space Network installations during flight radio science experiments is described. The stability analyzer provides realtime measurements of signal properties of general experimental interest power, phase, and amplitude spectra Allan deviation and time series of amplitude, phase shift, and differential phase shift. Input ports are provided for up to four 100 MHz frequency standards and eight baseband analog 100 kHz bandwidth signals. Test results indicate the following upper bounds to noise floors when operating on 100 MHz signals -145 dBcHz for phase noise spectrum further than 200 Hz from carrier, 2.5 x 10-15 tau 1 second and 1.5 x 10-17 Tau 1000 seconds for Allan deviation, and 1 x 10-4 degrees for 1-second averages of phase deviation. Four copies of the stability analyzer have been produced, plus one transportable unit for use at non-NASA observatories.