Polarimetric calibration is indispensable to quantitatively apply and analyze the polarimetric synthetic aperture radar (PolSAR) image. At present, methods relying on assumption of reflection symmetry have been widely used, which need extract reference targets that meet assumptions before then calculate cross-pol channel imbalance crosstalk errors. However, distortion in uncalibrated image will...

Electromagnetic (EM) scattering calculation is a very important part of most synthetic aperture radar (SAR) target image simulation methods. It affects the intensity echo signal to great extent, thus affecting quality final image. EM reflection models are usually approximate formulas derived under certain assumptions. The errors between these and actual situation can cause significant differenc...

Timing and Amplitude of Wave Reflection To the Editor: Dr Mitchell is to be complemented on a perceptive, articulate editorial on detection and interpretation of wave reflection in the human arterial system.1 While we have differed in the past, modification of 2 points would bring his views into line with ours. First, we see no specific implication of “impedance matching” (increasing proximal a...

Forward modeling of reflection seismic data is a computational process through which a geologic model (units: horizontal distance, vertical depth; layer acoustic impedance) of the subsurface is transformed into a synthetic reflection seismic record (units: horizontal distance, 2-way travel time; reflection amplitude). Synthetic seismic records (synthetics) are often generated both before and af...