Median filter for reducing data error in distance measuring equi

Details Median filter for reducing data error in distance measuring equi Median filter for reducing data error in distance measuring equi

1985-02-19

1987-06-09

Gruber, Felix D.

Boots, shoes, and leggings

364561, 364724, G06F 15353, G05D 102

Patent

active

046725679

ABSTRACT:
A set containing an odd number N of successive raw range data samples from precision distance measuring equipment is established. The set is arranged in ascending order of sample magnitude. The median member of the ordered set, i.e. the (N-1/2+1 member, is selected for processing in an alpha-beta type digital filter. The filter output is compensated for the delay introduced by using the median member of the set as the input to the alpha-beta filter. The compensated filter output is utilized as the distance input signal to a display or aircraft flight control system.

REFERENCES:
patent: 3998410 (1976-12-01), Smith
patent: 4128835 (1978-12-01), Russell
patent: 4455556 (1984-06-01), Koshio et al.
Oflazer: Design and Implementation of a single chip 1-D Median Filter, IEEE Transactions on Acoustics, Speech, and Signal Processing. vol. ASSP-31, No. 5, Oct. 1983, pp. 1164-1168.
Wolfe et al.: Fast Media Filter Implementation, SPIE vol. 207, Applications of Digital Image Processing III-1979 pp. 154-160.
Kanyuck: Transient Response of Tracking Filters with Randomly Interrupted Data, IEEE Transactions on Aerospace and Electronic Systems, vol. AES-6, No. 3, May 1970 pp. 313-323.
Robinson et al.: Principles of Digital Filtering, Geophysics vol. 29, No. 3, Jun. 1964 pp. 395-404.

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