Amplitude distribution of a noise generator for suppression of side electromagnetic emissions from the monitor screen.

• Видавець: Інститут проблем реєстрації інформації НАН України
• Дата: 2022
• Автори: Євграфов, Д. В., Яремчук , Ю. Є.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: Інститут проблем реєстрації інформації НАН України 2022
• Теми: spurious electromagnetic radiation and interference; monitors based on liquid crystal structures; white Gaussian noise; systems of orthogonal polynomials; Legendre polynomials of the first kind; побічні електромагнітні випромінювання та наведення; монітори на рідинно-кристалічних структурах; білий гаусівський шум; системи ортогональних поліномів; поліноми Лежандра першого роду
• Онлайн доступ: http://drsp.ipri.kiev.ua/article/view/275041

The possibilities of constructing modern noise generators for suppressing spurious electromagnetic radiation and interference, which is fundamentally different from analog noise signal generators using semiconductor noise elements, are taken into account. The structure of a modern broadband noise generator for combating spurious electromagnetic radiation and interference, which generates a random digital code and converts it into a continuous signal, is considered. The efficiency of such a generator was studied through the quality indicators of spurious radiation detection by a specialized enemy reconnaissance tool. The influence of the generator signal on the false alarm probability of the enemy reconnaissance equipment, coordinated with the signal of spurious radiation and pickups from monitor screens on liquid crystal structures, is studied. It has been proven that the effect on a specialized reconnaissance tool is proportional to the dispersion of the noise signal with an amplitude distribution that is not necessarily Gaussian. The dispersions of the amplitudes of noise signals distributed not according to the Gaussian law are studied. It is shown that random signals with uniformly distributed amplitudes have a greater dispersion than for a truncated Gaussian distribution. To confirm this, studies of the signal of the Mars vibroacoustic noise generator in the Excel software product are given, which are similar in structure to a modern noise generator for combating spurious electromagnetic radiation. Assuming that the ideal noise signal is close to uniformly distributed, a representation of the amplitude distribution is found next to the even Legendre polynomials of the first kind, the maximum dispersion of which depends only on the first two even coefficients of the series. It is concluded that the parabolic distribution of the amplitude of the noise generator is the best, since a signal with maximum dispersion is generated for fixed noise voltage boundaries. It is shown that in case of complication of the computational problem of searching for random codes, they can be replaced by harmonics with discrete uniformly distributed phases, or discrete uniformly distributed random variables.