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Design and Performance of Sampled Data Loops for Subcarrier and Carrier TrackingDesign 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.
Document ID
19850005679
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Aguirre, S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Hurd, W. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 12, 2013
Publication Date
November 15, 1984
Publication Information
Publication: The Telecommunications and Data Acquisition Rept.
Subject Category
Communications And Radar
Accession Number
85N13988
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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