Accession Number : ADD011601

Title :   Real Time Data Smoother and Significant Values Selector.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Werst,M C

Report Date : 08 Jan 1985

Pagination or Media Count : 14

Abstract : A digital data preprocessor is disclosed wherein consecutive samples of noisy raw digital data telemetered from a dropsonde and decommutated are stored in a first storage stack of registers. Adjacent samples are subtracted, the adjacent first-differences therefrom are subtracted, and the resulting second-differences are stored in a second storage stack of registers. By a comparison of raw data with the second-differences, raw data distorted by noise are measured and subsequently restored to a new value calculated from valid values of raw data samples adjacent to the distorted value. The second-differences are fed through a series of adders to provide a sequence of second-sliding-sums which are stored in a third stack of storage registers. A significant value selector tests the sliding-sums using three different criteria. The results of the tests are used as a basis for selecting raw data samples from the stack for pre-output smoothing of the raw data. The pre-output smoothing and value selection allow for a reduction in the number of data points fed to a processor such as a refraction calculator. (Author).

Descriptors :   *PATENTS, *PREPROCESSING, *DROPSONDES, *DATA PROCESSING, NOISE, ATMOSPHERIC REFRACTION, DIGITAL SYSTEMS, STACKING, REGISTERS(CIRCUITS), CALCULATORS, VALUE, REAL TIME, SAMPLING, DATA BASES, SELECTION, SEQUENCES, STORAGE, DISTORTION, REFRACTION

Subject Categories : Atmospheric Physics
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE