Pulse Doppler Map Matching

Edwin R. Hiller

doi:10.1117/12.959132

23 December 1980 Pulse Doppler Map Matching

Edwin R. Hiller

Proceedings Volume 0238, Image Processing for Missile Guidance; (1980) https://doi.org/10.1117/12.959132
Event: 24th Annual Technical Symposium, 1980, San Diego, United States

Abstract

Synthetic aperture radar (SAR) images obtained in real time on a moving vehicle can provide a means for obtaining fix data for the vehicle navigation system. Reference features are located in the SAR images through the use of map matching techniques, with each match providing a measurement of range and range rate to a known reference point. Three matches or fixes made in different directions can provide data for a complete position and velocity determination. A map matching technique has been developed for use with SAR images that utilizes a reference template that encodes only the shape (and not the difficult-to-predict image intensity levels) of the selected reference feature. Through an adaptive and localized normalization of the sensed image pixel amplitudes a matching metric is computed that is a strong function of the degree of shape match of the sensed image and the reference template but is only weakly dependent on the image intensity and contrast. This results in the reference feature being acquired and located with high probability even in the presence of computing features with possibly higher contrast. The map matching algorithm is described and results of theoretical analysis of its performance characteristics are presented with specific attention given to the effects of scene scintillation or speckle in the sensed imagery. The algorithm has been used on a large data base of SAR imagery with good success. Several examples are included to indicate typical performance for both urban and rural environments.

Citation Download Citation

Edwin R. Hiller "Pulse Doppler Map Matching", Proc. SPIE 0238, Image Processing for Missile Guidance, (23 December 1980); https://doi.org/10.1117/12.959132

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KEYWORDS

Binary data

Synthetic aperture radar

Image processing

Radar

Missiles

Image registration

Stereolithography

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