Coherent correlation addition for increasing match information i

Details Coherent correlation addition for increasing match information i Coherent correlation addition for increasing match information i

1990-01-24

1992-09-08

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Return signal controls external device

Aircraft guidance

356 2, 382 42, G01C 1112

Patent

active

051462281

ABSTRACT:
A method and apparatus are described for image matching, particularly for increasing match information in scene matching navigation systems. The invention correlates a sequence of sensed images with a reference map and stores the resultant correlation surfaces. The correlation surfaces are then added so that match point correlations combine coherently by superposing the individual correlation surfaces using short term accurate navigation data. As a result, a composite correlation surface is formed in which the values at the peak (or antipeak) position add up and the effective match area is greatly increased. Both peaks and antipeaks are then detected to determine a match point and provide a navigation position update.

REFERENCES:
patent: 4802757 (1989-02-01), Pleitner et al.
patent: 4925274 (1990-05-01), James et al.

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