The SAR transmits a long, low-peak-power chirp. Upon reception, a matched filter is applied. This digital convolution compresses the long pulse into a short, high-amplitude spike. This defines the of the system.
. Because SAR is an active sensor using microwave frequencies, it provides all-weather, day-and-night imaging capabilities. 1. Fundamental Principles digital processing of synthetic aperture radar data pdf
Digital processing is the critical stage that transforms raw, unintelligible radar echoes into high-resolution, focused imagery. Synthetic Aperture Radar (SAR) systems use the motion of a platform (satellite or aircraft) to "synthesize" a massive virtual antenna, allowing for fine spatial resolution that would otherwise require an antenna kilometers long. The SAR transmits a long, low-peak-power chirp
Correcting geometric distortions (using a DEM) and mapping the image to a geographical coordinate system. Radiometric Calibration: This defines the of the system
Reading the theory in a PDF is one thing; coding it is another. Here is a minimal workflow derived from Cumming & Wong for processing raw SAR data: