I.V. Chebotar – Ph.D. (Eng.), Cherepovets Higher Military Engineering School of Radio Electronics E-mail: cvviur2@mil.ru

M.T. Baldytchev – Adjunct, Cherepovets Higher Military Engineering School of Radio Electronics

Yu.M. Vikulova – Project Manager, JSC «Radio Engineering Institute» (Moscow)

The article disclose the algorithm for detection of linear frequency modulation signals reflected from small size airborne objects (echo signals) on the water surface. The algorithm applies few procedures based on the quasi-optimal signal processing principles. These procedures are adaptation of the reject filter weight coefficients and adaptation of the window parameters of the local spectrum convolution for the expected structure of the group echo signal at the input of the receiving device. The developed algorithm allows to find the desired signal under conditions of low signal-to-noise ratio (up to -4 dB), as well as under the influence of passive coherent interference.

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