Faiza Ali - Academia.edu (original) (raw)

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Papers by Faiza Ali

Radar Conference (EuRAD), 2010 …, 2010

Abstract In this paper a K-band 360° 2D imaging radar utilizing a synthetic aperture scanning pr... more Abstract In this paper a K-band 360° 2D imaging radar utilizing a synthetic aperture scanning principle is introduced. A small omnidirectional antenna is mounted on a rotating platform to create a circular synthetic aperture. Based on a broadband holographic reconstruction ...

IEEE Transactions on Microwave Theory and Techniques, 2014

ABSTRACT This paper introduces a concept for robot navigation based on a rotating synthetic apert... more ABSTRACT This paper introduces a concept for robot navigation based on a rotating synthetic aperture short-range radar scanner. It uses an innovative broadband holographic reconstruction algorithm, which overcomes the typical problem of residual phase errors caused by an imprecisely measured aperture position and moving targets. Thus, it is no longer necessary to know the exact trajectory of the synthetic aperture radar to get a high-resolution image, which is a major advantage over the classical holographic reconstruction algorithm. However, the developed algorithm is not only used to compute a high-resolution 360$^{circ}$ 2-D image after each turn of the radar platform while the robot is moving, but also to calculate the relative residual radial velocity between the moving radar scanner system and all targets in the environment. This allows us to determine the exact velocity of the robotic system on which the radar scanner is mounted, and thus to obtain the exact radar trajectory, if there are stationary targets like walls in the environment.

International Journal of Electronics and Telecommunications, 2011

The design of a short range synthetic aperture imaging radar is introduced in this paper. A radar... more The design of a short range synthetic aperture imaging radar is introduced in this paper. A radar hologram is acquired using a small omnidirectional antenna that is mounted on a rotating platform. After each turn of the platform a high resolution 360 • 2D image is reconstructed; a rotating window function optimizes the reconstructed image function to get the best image focus for detecting both weak and strong scatterers. The rotating window function depends on the target direction and is executed for each image point and each target direction. The size of the synthetic aperture -and thus the lateral resolution of the imaging system -is determined by the diameter of the circular antenna trajectory. In contrast to common radar scanner concepts that utilize highly directional and thus bulky antennas, the proposed scanner concept has the advantage of using a small, lightweight omni-directional antenna. The developed radar system is much more compact and the scanning mechanics are significantly simplified. Furthermore, an omni-directional antenna offers very straightforward options for powering the radar on the rotation platform. Measurement results obtained with a 24 GHz FMCW short range radar sensor illustrate the performance of the proposed SAR imaging method.

German Microwave Conference, 2010, 2010

Abstract This paper deals with a FMCW radar measurement scheme and a 2-D range-Doppler FMCW rada... more Abstract This paper deals with a FMCW radar measurement scheme and a 2-D range-Doppler FMCW radar Fourier processing that is especially suited to detect very weak moving targets. A 2-D Fourier transform is applied to a larger set of consecutively measured FMCW radar ...

The 40th European Microwave Conference, Sep 1, 2010