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Real-time spectral analysis algorithm for space plasma three-dimensional ion mass spectrometers

Rev. Sci. Instrum. 64, 2771 (1993); doi:10.1063/1.1144416

Issue Date: October 1993

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E. C. Sittler, Jr.
NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771
We have developed a fast real-time spectral analysis algorithm for space plasma three-dimensional (3D) ion mass spectrometers that deconvolves contributions to time-of-flight ion mass spectra for various ion species abundances. The algorithm is composed of a set of coupled linear equations with constant coefficients. The algorithm is implemented so that in-flight computers need only apply a predetermined number of multiplies and adds to the spectral data. The algorithm allows run times to be short and highly predictable, can accommodate the presence of background in the ion mass spectra, and can be updated to adjust to calibration changes and unexpected instrument anomalies or failures. Space plasma 3D ion mass spectrometers have the capability of generating large volumes of data and if not compressed would produce data rates that far exceed the telemetry rate usually allocated to space plasma instruments. The real-time application of this algorithm allows one to achieve compression ratios greater than 100 for the spectral data without introducing systematic errors to the computed ion abundances. It also allows the application of other higher level data compression techniques to provide additional compression of the telemetry data. Finally, the algorithm can be thought of as a way to increase the mass resolution of the ion spectrometer. Review of Scientific Instruments is copyrighted by The American Institute of Physics.
History: Received 10 February 1993; accepted 21 June 1993
Permalink: http://link.aip.org/link/?RSINAK/64/2771/1
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KEYWORDS and PACS

Keywords
PACS
  • 95.75.Fg
    Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations Observation and data reduction techniques; computer modeling and simulation Spectroscopy and spectrophotometry
  • 95.75.Pq
    Fundamental astronomy and astrophysics; instrumentation, techniques, and astronomical observations Observation and data reduction techniques; computer modeling and simulation Mathematical procedures and computer techniques
  • YEAR: 1993

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ISSN:
0034-6748 (print)   1089-7623 (online)
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