РЕЗУЛЬТАТИ АНАЛІЗУ ПАРАМЕТРІВ ПРИЙМАЧА СИГНАЛІВ З ЛІНІЙНОЮ ЧАСТОТНОЮ МОДУЛЯЦІЄЮ ПРИ ЕНЕРГЕТИЧНО ПРИХОВАНОМУ РЕЖИМІ РОБОТИ

The article considers processing methods and ground of optimal algorithms of signals receive with linear frequency modulation under the power hidden operating conditions. In the article calculating results of noise decorrelation parameter in the optimal treatment algorithms of power hidden signals are described. Certain separate principles of signals receiver construction with linear frequency modulation under the power hidden operating conditions.Проведён анализ методов обработки и обоснование оптимальных алгоритмов приёма сигналов с линейной частотной модуляцией при энергетически скрытом режиме работы. Приведены результаты расчётов параметров декорреляции шумов в оптимальных алгоритмах обработки энергетически скрытых сигналов. Определены отдельные принципы построения приёмных устройств сигналов с линейной частотной модуляцией при энергетически скрытом режиме работы.Проведено аналіз методів оброблення та обґрунтування оптимальних алгоритмів прийому сигналів з лінійною частотною модуляцією при енергетично прихованому режимі роботи. Наведено результати розрахунків параметрів декореляції шумів в оптимальних алгоритмах оброблення енергетично прихованих сигналів. Визначено окремі принципи побудови приймаючих пристроїв сигналів з лінійною частотною модуляцією при енергетично прихованому режимі роботи

Identification of energy-hidden chirp signals of telecommunication systems in conditions of parametric uncertainty

The ambiguity diagram of rectangular chirp RF pulse has been analyzed. The characteristic point of ambiguity diagram was identified. It was proposed to identify the signal on the basis of correlation level at the characteristic point of ellipsoidal ambiguity diagram built in a special coordinate system. The quasi-optimal autocorrelation algorithm with quadrature processing is proposed. This algorithm is resistant to a priori uncertainty of parameters of input energy-hidden signals with unknown waveform and unknown initial phase against the background of Gaussian stationary noise. The tuning parameters of identification scheme and the decision-making rule regarding the availability of chirp signal in the input mixture were determined. The simulation modeling of identification procedure was conducted using the software package Matlab R2016a. The simulation results confirmed the ability of the proposed algorithm to identify the chirp signal in the input mixture at small values of the signal-to-noise ratio

Extracorporeal Membrane Oxygenation during Percutaneous Coronary Intervention in Patients with Coronary Heart Disease

Extracorporeal membrane oxygenation (ECMO) has become an effective method in the treatment of adults and children with severe cardiac and pulmonary dysfunction that is resistant to conventional therapy. The aim of this article was to summarize an experience of ECMO usage for cardiac dysfunction, which develops in patients with coronary heart disease (CHD) during percutaneous transluminal coronary angioplasty. The study comprised a retrospective, single-center analysis of 23 patients with CHD (19 men and four women, average age 65.7 ± 12.3 years), who undertook the ECMO technique during percutaneous transluminal coronary angioplasty. A total of 13 (56.52%) patients died directly in the hospital, or 30 days after a discharge. Independent predictors of fatal outcomes were diabetes mellitus (odds ratio [OR] = 17.58; 95% confidence interval [CI] = 6.47–47.48; p = .00125), chronic renal failure (CRF) (OR = 20.81; 95% CI = 5.95–72.21; p = .00014), and damage to the right coronary artery (RCA) (OR = 25.51; 95% CI = 8.27–79.12; p = .00013). For deceased patients, the “no reflow” phenomenon was indicated in a larger percentage of cases (23.1% in the group of deceased, vs. 10% in the group of survivors). A routine connection to ECMO before the occurrence of cardiac events was significantly more often used in the group of survived patients (90% of cases) than in the deceased (p = .0000001). Diabetes mellitus, CRF, and damage to the RCA were independent predictors of mortality during percutaneous transluminal coronary angioplasty in patients with CHD. The routine use of ECMO in high-risk patients with percutaneous transluminal coronary angioplasty was a positive prognostic factor of patient survival

ICRF Plasma Production with the W7-X Like Antenna in the Uragan-2M Stellarator

The results of the plasma start-up with ICRH of U-2M RF discharges in H2+He mixture with newly implemented controlled gas H2 concentration are presented. The W7-X like ICRH antenna operated in monopole phasing with applied RF power of ∼ 100 kW. We investigated plasma start-up in the pressure range p = 6×10−4 - 9×10−2 Pa. Plasma production with an average density of up to Ne ∼ 1013 cm−3 was observed at frequencies the fundamental harmonic of the hydrogen cyclotron frequency