I.V. Donets1, A.S. Pashchenko2, Ya.A. Reyzenkind3, V.N. Schevchenko4

1,3,4 JSC «ARSRI «Gradient» (Rostov-on-Don, Russia)

1,3 Southern Federal University (Rostov-on-Don, Russia)

2 Don State Technical University (Rostov-on-Don, Russia)

There are two receiving channels, as a rule, in passive (stealthy, non-radiative) radar systems. The first (reference) channel is designed to receive a direct signal from an extraneous illumination source, and the second (observation channel) is designed to receive a mixture of signals scattered by stationary and moving objects. The joint processing of the signals of these channels, which is reduced to the calculation of a two-dimensional cross correlation function (TDCCF) between the signals of the reference channel and the observation channel, allows you to detect in the signal of the second channel time-delayed and frequency-shifted (due to Doppler shift) versions of the signal of the reference channel and build a radar image in the coordinates «delay-frequency offset» based on their delays, frequency shifts and amplitudes.

In this paper, a new computationally efficient procedure for constructing radar images in passive radar systems is obtained using non-square regularization. This procedure includes two stages. At the first stage, contributions from the leaked reference signal and reflections of large stationary objects are removed from the signal of the second channel. A similar operation is performed when analyzing the signals of the second channel using TDCCF. At the second stage, a radar image of the echo signals of targets is constructed sequentially on one node of the coordinate grid in the coordinates «delay – frequency offset», which differs from the one constructed with the help of TDCCF by partially taking into account noise. Based on experimental data, a comparison of radar images and the computational efficiency of the considered procedures is carried out.

DonetsI.V., Pashchenko A.S., Reyzenkind Y.A., Schevchenko V.N. Synthesis of the radar image in the coordinates «delay - frequency offset» in the nodes of the coordinate grid. Radioengineering. 2021. V. 86. № 11. P. 20−26. DOI: https://doi.org/10.18127/j00338486-202111-04 (in Russian)

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