3D post-processing of pre-beamformed RF data in the frequency-wavenumber domain

Three-dimensional (3D) high resolution beamforming is made more difficult by high data rates. This can be overcome by two-step imaging approaches such as the synthetic aperture beamforming technique. In this technique the first step significantly reduces the data rate by line-based delay and sum, whereas the second stage recombines the data to a...

Modelling of the over-exposed pixel area of CCD cameras caused by laser dazzling

A simple model has been developed and implemented in Matlab code, predicting the over-exposed pixel area of cameras caused by laser dazzling. Inputs of this model are the laser irradiance on the front optics of the camera, the Point Spread Function (PSF) of the used optics, the integration time of the camera, and camera sensor specifications...

Calibrating a high-Esolution wavefront corrector with a static focal-Plane camera

We present a method to calibrate a high-resolution wavefront (WF)-correcting device with a single, static camera, located in the focal-plane; no moving of any component is needed. The method is based on a localized diversity and differential optical transfer functions to compute both the phase and amplitude in the pupil plane located upstream of...

High-order wavefront correction with a spatial light modulator: Calibrations with dOTF method

We show how differential optical transfer function (dOTF) method is used to calibrate an adaptive optics setup using a spatial light modulator. SLM response, rotation and registration are measured sufficiently accurately for high-order WF correction. © OSA 2013.

TOD, NVTherm and TRM3 model calculations: a comparison

At the moment there are three potential models and associated measures to replace the FLIR92 model and the MRTD as the standard for sensor performance characterization and TA range predictions. These are: 1) the NVTherm model that calculates the MRTD-ID, 2) the TRM3 model that calculates the MTDP and 3) the TOD model that calculates the TOD. The...