RU2011108902A

RU2011108902A - METHOD FOR DETECTION AND SELECTION OF RADAR SIGNALS BY POLARIZATION SIGN AND DEVICE FOR ITS IMPLEMENTATION

Info

Publication number: RU2011108902A
Application number: RU2011108902/07A
Authority: RU
Inventors: Вячеслав Александрович Громов (RU); Вячеслав Александрович Громов; Герман Сергеевич Шарыгин (RU); Герман Сергеевич Шарыгин
Priority date: 2011-03-09
Filing date: 2011-03-09
Publication date: 2012-09-20
Also published as: RU2476903C2

Abstract

1. Способ обнаружения и селекции радиолокационных сигналов по поляризационному признаку, включающий прием двух ортогональных компонент сигнала, преобразование аналоговых сигналов приемных устройств в цифровую форму, запоминание их в устройствах памяти, интерполирование цифровых сигналов, запоминание интерполированных цифровых сигналов, последующие определения отношения амплитуд и разности фаз ортогональных компонент селектируемого сигнала, отличающийся тем, что производят вычисление совокупного поляризационного параметра принимаемого сигнала - угла эллиптичности и принятие решения о наличии селектируемого сигнала осуществляют при выполнении условия: εЛ≤ε≤εП, ! где εЛ и εП - левая и правая граница интервала обнаружения, ! - вычисленный угол эллиптичности принимаемого сигнала, ! , , , A - амплитуда горизонтальной компоненты сигнала Ex, B - амплитуда вертикальной компоненты сигнала Ey, α - разность фаз между этими компонентами, при этом границы интервала обнаружения εЛ и εП определяют с использованием критерия Неймана-Пирсона из уравнения: ! , ! где PЛТ - вероятность ложной тревоги, y(x) - функция плотности вероятности угла эллиптичности при отсутствии селектируемого сигнала. ! 2. Устройство обнаружения и селекции радиолокационных сигналов, содержащее двухполяризапионную антенну, двухканальный приемник, имеющий два входа, соединенные с выходами двухполяризационной антенны, и два выхода, два идентичных, соединенных с выходами двухканального приемника, канала, первый из которых состоит из каскадно соединенных первого фильтра нижних частот, первого аналого-цифрового преобразователя, первого устройства пам 1. A method for detecting and selecting radar signals according to a polarization feature, including receiving two orthogonal signal components, converting the analog signals of the receiving devices into digital form, storing them in memory devices, interpolating digital signals, storing the interpolated digital signals, subsequent determination of the ratio of amplitudes and phase difference orthogonal components of the selected signal, characterized in that they calculate the total polarization parameter aemogo signal - ellipticity angle and the decision on the presence of the selectable signal is carried out under the condition: εL≤ε≤εP,! where εЛ and εП are the left and right boundaries of the detection interval,! - the calculated ellipticity angle of the received signal,! ,,, A is the amplitude of the horizontal component of the signal Ex, B is the amplitude of the vertical component of the signal Ey, α is the phase difference between these components, and the boundaries of the detection interval εЛ and εП are determined using the Neumann-Pearson criterion from the equation:! ! where РЛТ is the probability of false alarm, y (x) is the probability density function of the ellipticity angle in the absence of a selectable signal. ! 2. A device for detecting and selecting radar signals containing a bipolarisation antenna, a two-channel receiver having two inputs connected to the outputs of the bipolarization antenna, and two outputs, two identical, connected to the outputs of the two-channel receiver, a channel, the first of which consists of a cascade-connected first filter low pass, first analog-to-digital converter, first memory device

Claims

1. A method for detecting and selecting radar signals by a polarization feature, including receiving two orthogonal signal components, converting the analog signals of the receiving devices into digital form, storing them in memory devices, interpolating digital signals, storing the interpolated digital signals, subsequent determination of the ratio of amplitudes and phase difference orthogonal components of the selected signal, characterized in that they calculate the total polarization parameter aemogo signal - ellipticity angle and the decision on the presence of the selectable signal is carried out under the condition: ε _R ≤ε≤ε _P,

where ε _L and ε _P - the left and right border of the detection interval,

- the calculated angle of ellipticity of the received signal,

,

, A is the amplitude of the horizontal signal component E _x , B is the amplitude of the vertical signal component E _y , α is the phase difference between these components, while the boundaries of the detection interval ε _Л and ε _{П are} determined using the Neumann-Pearson criterion from the equation:

,

where P _LT is the probability of false alarm, y (x) is the probability density function of the ellipticity angle in the absence of a selectable signal.

2. A device for detecting and selecting radar signals containing a bipolarisation antenna, a two-channel receiver having two inputs connected to the outputs of the bipolarization antenna, and two outputs, two identical, connected to the outputs of the two-channel receiver, a channel, the first of which consists of a cascade-connected first filter low frequencies, the first analog-to-digital converter, the first memory device, the first signal interpolation device and the second memory device, and the second channel is cascaded from a second low-pass filter, a second analog-to-digital converter, a third memory device, a second signal interpolation device and a fourth memory device, and a signal processing device having two inputs, the first of which is connected to the output of the second memory device, and the second to the output of the fourth a memory device, and two outputs, characterized in that it further introduces a decision block on the presence or absence of a selectable signal according to the polarization feature, having two inputs connected s with the outputs of the signal processing device, and an indicator, the input of which is connected to the output of the decision block on the presence or absence of a selectable signal according to the polarization attribute.