G.I. Andreev − Dr.Sc. (Eng.), Professor, General Director

E-mail: post@cnirti.ru

M.E. Zamarin − Deputy Director General for Science 

E-mail: m.zamarin@mail.ru

G.V. Ershov − Head of Sector 

E-mail: m1cro4nn@mail.ru

V.V. Kornev − Chief Specialist 

E-mail: hunter.kornev@yandex.ru

Radio countermeasures can be hardly effective without information support from radio intelligence system. Intelligence data are involved both to reveal the necessity of counteracting to detected emissions from radio electronic devices and to choose the most effective countermeasures. Modern weapons with radio electronic finding and guidance systems are usually dealing with compound signals and frequency tuning in a wide bandwidth. Therefore, radio intelligence system should be equipped with receivers capable to detect signals with parallel sweep and to locate radiation sources. Number of simultaneously processed signals is limited only to number of channels for a multichannel receiver and time of processing. Such a method allows to process intense signal flows, that feature up-to-date electronic environment, and to minimize the probability of signal missing that is of the most important for detecting of both radio systems with frequency tuning and short-time working radars. The most complicated problem is to locate the radiation source with a sufficient angular accuracy while mass and outer dimensions of a direction-finder are at minimum. The latter requirement meets a direction-finder that involves the following method. To get the accurate estimation of the location it is necessary to measure angle of received electromagnetic wave using an interferometer while preliminary angle measurement involving an amplitude method allows to eliminate phase ambiguity. The following direction-finding algorithm is suggested in this paper. A digital filtering and real time simultaneous detection of every signal in the whole frequency range without missing on the intermediate frequency is carried out. For every detected signal its power and phase in each channel is being measured. For every detected signal using measured power levels in every channel and involving amplitude method angle is being estimated. For every detected signal using estimated angles phase shift caused by angle of incidence of a plane wave front is being calculated. For every detected signal phase difference between receiving channels is being measured. For every detected signal using measured phase difference between receiving channels and calculated phase shift a new phase shift caused by strobe signal is being calculated. Using calculated phase shift caused by strobe signal a carrier frequency for every detected signal is being determined. For every detected signal using measured phase difference and calculated phase shift caused by strobe signal phase difference caused by angle of incidence of a plane wave front is being determined. For every detected signal using measured phase difference and involving phase method angle is being determined more accurately. As soon as the suggested algorithm is put into practice intense signal flows in real time can be processed with minimized probability of signal missing and without limitation of simultaneously processed signals. Moreover, it can be used when resources are limited and doesn’t require multichannel receivers.

Andreev G.I., Zamarin M.E., Ershov G.V., Kornev V.V. Broadeninig of instantaneous swath in radio intelligence systems. Radiotekhnika. 2020. V. 84. № 10(20). P. 15−. DOI: 10.18127/j00338486-202010(20)-02 (In Russian).

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