Computer Science – Performance
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984tdar.nasa...81a&link_type=abstract
In its The Telecommunications and Data Acquisition Rept. p 81-95 (SEE N85-13980 05-32)
Computer Science
Performance
Carrier Frequencies, Carrier Waves, Loops, Phase Locked Systems, Tracking Filters, Amplification, Bandwidth, Digital Integrators, Electromagnetic Noise, Signal To Noise Ratios, Voyager Project
Scientific paper
Design parameters and resulting performance are presented for the sampled data analogies of continuous time phase locked loops of second and third order containing perfect integrators. Expressions for noise equivalent bandwidth and steady state errors are given. Stability and gain margin are investigated using z plane root loci. Finally, an application is presented for Voyager subcarrier and carrier tracking under the dynamics of the encounters with Uranus and Neptune. For carrier tracking, loop bandwidth narrow enough for satisfactory loop signal to noise ratios can be achieved using third order loops without rate aiding, whereas second order loops would require aiding. For subcarrier tracking, third order loops can be used when the sampling rate is limited to approximately once per second, as in the Baseband Assembly, whereas second order loops sufficiently wide to track the dynamics have stability problems at that sampling rate.
Aguirre S.
Hurd W. J.
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