This paper considers the problem of locating a stationary radar emitter from a single airborne platform making frequency measurements in the presence of aperture state uncertainty. It is shown that the location accuracy is most sensitive to aperture velocity uncertainty and that location accuracy can be improved by using a MEMS accelerometer at the aperture A decentralized method is developed f...

A critical examination is made of the somewhat loose and incomplete statement that a polar diagram is the Fourier transform of an aperture distribution. By aperture distribution it is necessary to understand, in the two-dimensional case, distribution across the aperture of the component along the aperture plane of the electromagnetic field in the plane of propagation. Furthermore, the concept o...

1077-3142/$ see front matter 2011 Elsevier Inc. A doi:10.1016/j.cviu.2011.10.010 ⇑ Corresponding author. E-mail addresses: [email protected] (X. Shu), [email protected] (N. Ahuja). Many computational imaging applications involve manipulating the incoming light beam in the aperture and image planes. However, accessing the aperture, which conventionally stands inside the imaging lens, is stil...

Since 1960s, aperture patterns have been studied extensively and a variety of coded apertures have been proposed for various applications, including extended depth of field, defocus deblurring, depth from defocus, light field acquisition, etc. Researches have shown that optimal aperture patterns can be quite different due to different applications, imaging conditions, or scene contents. In addi...

The TUD Synthetic Aperture Radiometer is a 2-channel demonstration model that can simulate a thinned aperture radiometer having an unfilled aperture consisting of several small antenna elements. Aperture synthesis obtained by interferometric measurements using the antenna elements in pairs, followed by an image reconstruction based on an inverse Fourier transform, results in an imaging instrume...

Controlled-source electromagnetics (CSEM) is a geophysical method used by industry to find and derisk reservoirs in marine settings. To reduce the impact of the complicated settings and improve the detecting capabilities of CSEM, we apply synthetic aperture, which virtually increases the length of the source. Applying a weight to each source steers or focuses the synthetic aperture source array...

Autonomous navigation airborne forward-looking synthetic aperture radar (SAR) observes the anterior inferior wide area with a short cross-track dimensional linear array as azimuth aperture. This is an application scenario that is drastically different from that of side-looking space-borne or air-borne SAR systems, which acquires azimuth synthetic aperture with along-track dimension platform mov...

We consider passive synthetic aperture imaging where a single moving receiver antenna records signals that are generated by distant unknown noise sources and backscattered by one or several reflectors. The reflectors can be imaged by migrating the autocorrelation functions of the received signals. We compare this passive synthetic aperture imaging with the usual, active synthetic aperture imagi...

Multi-aperture speckle shear interferometry also exhibits sensitivity to the in-plane displacement component. The interferogram obtained even at normal illumination contains fringes due to the combined contributions of slope, strain and in-plane components. The fringe pattern, therefore, changes when the shear element is placed at different aperture positions for the same experimental condition...

Zernike polynomials have been widely used to describe the aberrations in wavefront sensing of the eye. The Zernike coefficients are often computed under different aperture sizes. For the sake of comparison, the same aperture diameter is required. Since no standard aperture size is available for reporting the results, it is important to develop a technique for converting the Zernike coefficients...