A.V. Vodolazov1, G.A. Lesnikov2, V.V. Chapursky3

1–3 NIIRET of Bauman Moscow State Technical University (Moscow, Russia)

A mathematical model has been developed to evaluate the accumulation of a signal against a background of noise in a MIMO radar of a circular azimuth view with a digital view of the elevation angle when using variants of incoherent and coherent signal accumulation over the intervals of Doppler ambiguity in each of the orthogonal channels of the MIMO radar.

Using concrete examples, the efficiency of incoherent and coherent accumulation of a packet of LFM signal pulses over 900 intervals of Doppler ambiguity in each of the orthogonal channels of the MIMO radar of the circular azimuth view with a digital view of the elevation angle with subsequent incoherent summation over all orthogonal spatial frequency channels of the radar was compared.

For the accepted initial parameters of the MIMO short-range radar, according to the results of modeling, the values of the output s/n ratio with incoherent accumulation over the intervals of Doppler ambiguity were 21 dB at a target range of 6 km and 11.2 dB at a target range of 8 km. With coherent accumulation over the ambiguity intervals, they amounted to 30.6 dB at a target range of 6 km and 21.7 dB at a target range of 8 km. At the same time, the c/n ratio at the input of the orthogonal MIMO radar channels was ‑20.2 dB and ‑25.2 dB, respectively, at ranges of 6 and 8 km.

After performing coherent summation by Doppler ambiguity in each of the MIMO channels, there are options for intermediate coherent summation by the output of these channels for each of the receiving sublattices, as well as complete coherent summation over all 32 MIMO channels in the considered case. Mixed variants of coherent and incoherent summation in the spectral region via MIMO channels are also possible. This will require taking into account the range phases on the "transmittig sublattice - target - receiving sublattice" routes and the accumulation of output effects in the "Doppler frequency – delay" plane, which can be based on the development of the results of the work [5].

Vodolazov A.V., Lesnikov G.A., Chapursky V.V. Spectral accumulation over ambiguous Doppler intervals for MIMO radar with digital overview by elevation angle. Radiotekhnika. 2022. V. 86. № 3. P. 77−87. DOI: https://doi.org/10.18127/j00338486-202203-08
(In Russian)

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