Several methods have been proposed to train microwave radiometers to retrieve precipitation rates estimated by a radar which observed the same location at the same time. These radar-trained passive-microwave algorithms differ in the quantities that are estimated: some estimate the vertically-integrated liquid water, while others estimate the near-surface precipitation. Since it is no more or le...

Passive radar is a rapidly emerging technology with many distinct advantages over traditional radar. Its exploitation of “illuminators of opportunity” renders it covert, as well as less expensive. Several passive radar systems, such as Lockheed Martin’s Silent Sentry and John Sahr’s Manastash Ridge Radar at the University of Washington, are already capable of detecting and tracking aircraft. Ou...

Stationary clutter arises in a wide area of different radar or sonar applications. Without adaption to a non-uniform clutter distribution, tracking algorithms try to initialize tracks in these areas repeatedly while in most cases there is no target to be found. The intention of this paper is to discuss different ways to enable clutter mapping in order to use this as an efficient tool for target...

1) Target recognition via radar cross section (RCS) profiles: In this approach, databases of the RCS of targets at different incident and observed angles are created using method-of-moments computational electromagnetics codes. The extracted RCS profiles for different targets, scaled to account for antenna patterns and atmospheric propagation, are compared to the collected data. A coordinated f...

Abstract. This paper derives three-dimensional passive bearings-only localization algorithms and examines their performance in the presence of large measurement noise by way of simulations. Among the algorithms studied, an iterative Gauss-Newton (GN) implementation of the maximum likelihood (ML) estimator is shown to have the best localization performance. In order to reduce the computational c...

In this article, a matching pursuit algorithm is developed to improve the performance of a passive multiplexing technique based on compressed sensing. This deconvolution technique is applied to RADAR imaging in the microwave range, starting from previous studies based on a compact coding device and L1-norm regularizations. This study demonstrates that in this context, the quality of the reconst...

Use of passive or parasitic radars has been an active area of research in recent years. Such radars mostly depend on communication emitters of opportunity. One recent development in the field of communication engineering is the newly adopted standards for whitespace communication which frees the usage of analog TV bands. These bands because of their low-frequency nature, are suitable for foliag...

In a recent study (Haddad and Park, 2009), a method was proposed to use co-located simultaneous observations by the space-borne Tropical Rainfall Measuring Mission (TRMM) precipitation radar and microwave imager to train the microwave radiometer to retrieve vertical profiles of precipitation in the absence of radar observations. This radartrained passive-microwave approach was developed for mid...