By combining two well-established techniques--multispectral imaging with a tunable filter and regularized data inversion--a fast and accurate method for measuring, at each pixel of a CCD array, the spectrum emitted by a radiating object is obtained. The method is demonstrated with ruby R(1)- and R(2)-line fluorescence, using a narrowband tilt-tunable Fabry-Perot interference filter for data acq...

Abstract—Traditional space-time adaptive processing (STAP) algorithm not only have a big computation, but also cannot suppress the multiple narrowband jammer and the narrowband jammer which come from the same direction with the useful signal. Focus on these problems, an improved GPS anti-jam multistage nested Wiener filter (MSNWF) method which combines with multistage IIR lattice notch filter w...

In optical imaging systems, the wavelength-dependency of the refraction indices of lenses causes chromatic aberrations: electromagnetic radiation from an object point is dispersed in a rainbow-like manner on the sensor. These aberrations were so far only measured and modeled for up to three, often relatively wideband wavelength bands like R, G and B. Moreover, no relation between the aberration...

This paper presents a new software for design of through-the-wall imaging radars. The first part describes the evolution of a ray tracing simulator, originally designed for propagation of narrowband signals, and then for ultra-wideband signals. This simulator allows to obtain temporal channel response to a wide-band emitter (3 GHz to 10 GHz). An experimental method is also described to identify...

This paper extends and complements previous research we have performed on the performance of nonadaptive narrowband suppression filters when used in cellular codedivision multiple-access (CDMA) overlay situations. In this paper, an adaptive least mean square (ILMS) filter is applied to a cellular CDMA overlay in order to reject narrowband interference. An accurate expression for the steady-stat...

In this paper, a code-division multiple access (CDMA) cellular overlay system is investigated, employing the idea of multicarrier CDMA, which has recently received significant attention as an alternative to traditional single-carrier CDMA [1]. Overlay is pursued here as a means of long-term transition from narrowband cellular to CDMA cellular. A major result of this paper is the demonstration t...

This paper describes a statistical signal-processing method for exploiting narrowband bistatic RF measurements to detect and track moving people (hereafter referred to as "dismounts"). In our approach, RF measurements are made by a constellation of narrowband radar units, arranged around a surveillance region. There are several benefits of narrowband radar in this application, which we describe...

Nonlinear effects, or non-Wiener behavior, have been observed in several adaptive filtering applications, such as adaptive equalization of wideband communication signals contaminated by narrowband interference, adaptive narrowband noise cancellation, and adaptive linear prediction of narrowband processes. The nonlinear effects have been especially prominent when narrowband processes have been i...

Motivated by Thomson's multiple taper spectral estimation technique, we derive a new, robust procedure for automatically separating time series data into its constituent narrowband and broadband time series components. The new procedure avoids the pitfalls of adaptive notch lters, PCI method, or other similar algorithms, of mistaking and ltering local spectral peaks of the broadband component a...

This paper extends and complements previous research we have performed on the performance of nonadaptive narrowband suppression filters when used in cellular codedivision multiple-access (CDMA) overlay situations. In this paper, an adaptive least mean square (ILMS) filter is applied to a cellular CDMA overlay in order to reject narrowband interference. An accurate expression for the steady-stat...