SARS-CoV-2 is frequently transmitted by aerosol, and the sterilization of virus in airflows has numerous potential applications. We evaluated a UV-C illuminator similar to what might be incorporated into tubing mechanical ventilator for its ability block transmission airborne from infected naïve hamsters. Hamsters protected UV system were consistently infection, whereas non-protected hamsters u...

A new technique which we call Iterative Redeployment of Illumination and Sensing (IRIS) is introduced and applied to See-Through-the-Wall radar imaging. IRIS is applicable to adaptive sensing scenarios where the medium is illuminated and measured multiple times using different illiminator/sensor configurations, e.g., position, bandwidth, or polarization. These configurations are adaptively sele...

The feasibility of using GPS as a bistatic radar illuminator for the purposes of air target detection is examined. The power budget analysis is first performed assuming the use of a single satellite, but is followed by a discussion of the expected improvements when multiple satellites are employed. The analysis includes the effect of GPS signal strength dynamic range, also known as the ‘near-fa...

Passive Coherent Location (PCL) requires detailed knowledge about the geometric transceiver-receiver-constellations and the technical parameters for simulating the effective field of view. Geographic Information Systems (GIS) provide tools to fuse spatial information with technical metadata to evaluate individual geometric constellations and obtain optimal radar coverage. This paper presents a ...

Measuring plant chlorophyll concentration is a well-known and commonly used method in agriculture and environmental applications for monitoring plant health, which also correlates with many other plant parameters including, e.g., carotenoids, nitrogen, maximum green fluorescence, etc. Direct chlorophyll measurement using chemical extraction is destructive, complex and time-consuming, which has ...

A set of theoretical techniques to prevent a radar from being used by a bistatic radar receiver as a non-cooperative illuminator are analysed. This works by radiating in addition to the radar signal waveform, a ‘masking signal’ waveform which is orthogonal to the radar signal waveform, both in the coding domain and the spatial domain. A number of different coding schemes are analysed. Two spati...

This tutorial describes the basis of passive bistatic radar (PBR) systems, and in particular the nature of the waveforms of illuminators of opportunity that they exploit. It shows that there is a wide variety of such waveforms, from broadcast, communications and radionavigation transmissions, and that in general they are not optimum for radar purposes. In addition, they usually vary significant...