Multi-spectral Image Fusion

Image fusion is the concept of combining information from multiple images into a single image. Pan-sharpening is an example of image fusion

Pan-sharpening and Satellite Imaging

Pan-sharpening refers to the fusion of low resolution multi-spectral (colour) images with high resolution panchromatic (black & white) image to produce a high resolution colour image. The input images are assumed to be co-georegistered. The output image retains (ideally) the spectral features of the colour images and the spatial features of the panchromatic image.

Most Earth resource satellites provide multi-spectral images at a lower spatial resolution and panchromatic images at a higher spatial resolution. This is true for SPOT, IRS, Landsat 7, IKONOS, and Quickbird.

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Software GPS Signal Simulator

Modern GPS receivers adopt a digital architecture. RF signal is converted to digital data and DSP is used to extract satellite data. This serves the important purposes of re-programmability and flexibility. In this context a software GPS signal simulator which generates digital GPS waveform is an important tool for research and performance analysis of GPS receiver algorithms.

The GPS Signal Simulator developed by NeST is a highly flexible and modular software tool based on MATLAB. It provides "true to life" multi channel GPS L1 band signal under conditions defined and completely controlled by the user. Output is available as a binary file which can be used as offline input for software receivers

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