This work details an interference mitigation scheme for synthetic aperture radar (SAR) which adapts the transmitted waveform spectrum to restore quality of scene range-profile based on estimated spectrum. By expressing estimation in presence correlated noise as a system identification problem, cost function optimal is derived. In order respond effectively changes radio frequency (RF) environmen...

This paper mainly deals with the problem of target detection in compound-Gaussian clutter with orthogonal frequency division multiplexing (OFDM) radar. First, the OFDM measurement model is developed to compound-Gaussian clutter by taking advantage of frequency diversity of OFDM radar waveform and we devise a generalized likelihood rate test (GLRT) detector where the target scattering coefficien...

The use of information theory to design waveforms for the measurement of ex tended radar targets exhibiting resonance phenomena is investigated. The target impulse response is introduced to model target scattering behavior. Two radar waveform design problems with constraints on waveform energy and durat ion are then solved. In the first, a deterministic target impulse response is used to design...

In this dissertation, we study the problem of waveform design for improvement of detection performance in radar systems. To this end, for single-input single-output (SISO) systems, we consider the effect of the signal-dependent interference at receive side (i.e., clutter) and the fact that Doppler shift of targets are often unknown at the transmit side. The raised design problems (for various s...

We introduce and analyze several algorithms for optimal illumination in array imaging. We consider time reversal and Kirchhoff migration imaging in homogeneous media, in regimes where the signal-to-noise ratio is high (infinite). Extensions to coherent interferometric imaging in clutter are described briefly. We show with numerical simulations that the optimal illumination algorithms image sele...

Radar transmit signal design is a critical factor for the radar performance. In this paper, we 1 investigate the problem of radar signal waveform design under the small signal power conditions 2 for detecting a doubly spread target, whose impulse response can be modeled as a random process, 3 in a colored noise environment. The doubly spread target spans multiple range bins (range-spread) 4 and...

It has been shown that time reversal (TR), which is developed in the acoustics domain, can also improve the detection performance of a radar system. However, the TR technique is no longer a good choice when the noise level is high since the retransmitted signal contains significant noise components. We investigate a multiple input-multiple output (MIMO) detection process similar to TR detection...

Multiple-input multiple-output (MIMO) radar has superior performance to conventional one. It has been introduced to almost every application field of conventional radar in recent years. In practical application, MIMO radar also faces the problem of congested spectrum assignment, which makes it not possible to have a continuous clear band with large bandwidth. Sparse frequency waveform that cont...

The Center for Collaborative Adaptive Sensing of the Atmosphere (CASA) is embarking on a paradigm of network of small radars to sample the atmosphere at high resolution. A fundamental physical limit imposed by transmission from single radar is the problem of decreasing resolution as a function of range. In addition the lowest coverage altitude increases with range due to earth curvature. As an ...