Abstract: Radar signal detection and parameter estimation is central in passive surveillance systems, providing inputs for many information processing modules in order to detect, localize, indentify and intercept hostile targets. The proposed method for detecting radar signals and estimating their intra-pulse parameters in time-varying noisy environments consists of several stages: magnitude-squared envelopes calculation, adaptive noise floor estimation, detection statistics calculation, rising edge detection, time of arrival estimation, falling edge detection, time of departure estimation, pulse width estimation, amplitude estimation and center frequency and bandwidth estimation. Estimated intra-pulse parameters are wrapped into pulse descriptor words (PDWs) for information processing tasks, where each PDW consists of time of arrival, time of departure, pulse width, pulse amplitude, center frequency, signal bandwidth, noise floor level and additional useful information.

Abstract: A method of removing a metal contaminant from a light hydrocarbon stream comprises introducing a light hydrocarbon stream into a reactor vessel, the reactor vessel containing an aqueous treatment composition which comprises a treatment agent comprising one or more of the following: an alkali metal salt of a thiocarbonate; an alkaline earth metal salt of a thiocarbonate; an alkali metal salt of a tetrathioperoxy carbonate; or an alkaline earth metal salt of a tetrathioperoxy carbonate, the light hydrocarbon stream having an API gravity of greater than 28 degree determined in accordance with ASTM D 287-12 and comprising a metal contaminant; contacting the light hydrocarbon stream with the aqueous treatment composition generating a treated light hydrocarbon stream with a reduced level of the metal contaminant; and removing the treated light hydrocarbon stream from the reactor vessel.

Abstract: A method of removing a metal contaminant from a light hydrocarbon stream comprises introducing a light hydrocarbon stream into a reactor vessel, the reactor vessel containing an aqueous treatment composition which comprises a treatment agent comprising one or more of the following: an alkali metal salt of a thiocarbonate; an alkaline earth metal salt of a thiocarbonate; an alkali metal salt of a tetrathioperoxy carbonate; or an alkaline earth metal salt of a tetrathioperoxy carbonate, the light hydrocarbon stream having an API gravity of greater than 28 degree determined in accordance with ASTM D 287-12 and comprising a metal contaiminant; contacting the light hydrocarbon stream with the aqueous treatment composition generating a treated light hydrocarbon stream with a reduced level of the metal contaminant; and removing the treated light hydrocarbon stream from the reactor vessel.