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NASA GSFC Report on CCSDS Recommendations 2.1.8A B Minimum Earth Station Transmitter Frequency Resolution for Spacecraft Receiver AcquisitionIn Fall 2016, ESA presented paper SLS-RFM 16-10 documenting a possible issue with the frequency lock-in range specification in Recommendation 2.1.8A of typically 267 to 1067 Hz in considerings (b) from considerings (a) for loop bandwidths [2B(sub LO)] in the range of 200 to 800 Hz with a recommendation of 100 Hz step size for frequency sweeping. The paper calculated the lock-in range to be (+/-)266 to (+/-)1064 rad/s or (+/-)42 to (+/-)168 Hz. Also, Recommendation 2.1.8B has the same issue for considering (a) and (b), i.e. for 2B(sub LO) =10 Hz, a lock-in range of 13 Hz was specified and a recommendation of 5 Hz step size for frequency sweeping. ESA also provided test results from the Rosetta and Exomars transponders. The results were somewhat inconsistent since the tests to verify lock-in and pull-in range did not include acquisition time, which is vital to the definition of these performance measures. This paper will address these test results below. However, we first examine the rationale for Recommendation 2.1.8A/B and its consistency with the theory of 2nd order phase lock loop operations. Our approach is to design a digital phase locked loop (DPLL) from phase locked loop (PLL) requirements. All analysis will be performed with a DPLL.
Document ID
20170004526
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Fong, Wai (NASA Goddard Space Flight Center Greenbelt, MD United States)
Lee, Wing (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
May 10, 2017
Publication Date
February 21, 2017
Subject Category
Communications And Radar
Numerical Analysis
Report/Patent Number
GSFC-E-DAA-TN39574
Meeting Information
Meeting: Consultative Committee for Space Data Standards (CCSDS) 2017 Spring Meeting
Location: San Antonio, TX
Country: United States
Start Date: May 8, 2017
End Date: May 12, 2017
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
digital phase locked loop
transponders
phase locked loop

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