METHOD FOR DETERMINING THE FLIGHT ALTITUDE OF A LOW-FLYING TARGET OF A MONOPULSE TRACKING RADAR Russian patent published in 2021 - IPC G01S13/44 

FIELD: radar.

SUBSTANCE: invention relates to radar and can be used in a radar station (radar) tracking low-flying targets at low elevation angles in the presence of interfering reflections from the underlying surface. In the claimed method, the formation and emission of probing radar signals, reception of reflected echo signals from a low-flying target (LFT) and from the underlying surface (signal "antipode") and their processing using a radar computer to determine the elevation angle of a low-flying target without opening the loop of the tracking system is carried out by the corner of the place. In the process of tracking the LFT, at each sensing cycle, the radar operates at one of n different operating wavelengths λ₁, λ₂, …, λ_n, and the values of λ change incrementally by 10% -50% in the direction of increasing or decreasing, and the sequence of working lengths waves are cyclically repeated. At each cycle, when using one of the wavelengths λ, the radar receives the total reflected signal (a mixture of the direct signal from the target and the “antipode” signal) and the radar computer stores the value of the signal module of the elevation difference channel. That. for each wavelength λ, n numerical arrays are formed step by step, consisting of signal modules of the elevation difference channel for this wavelength λ. In these arrays, each time step, a sliding search for a minimum is performed, and with the accumulation of n successive minima of the signal modules of the elevation difference channel for each pair of these minima, the corresponding ranges from the radar to the target R₁ and R₂ are determined and s objective functions F₁ (Н_t, Ν_Х), F₂ (Н_t, Ν_Х), … Fs (Н_t, Ν_Х), where s is equal to the number of combinations of n by 2, where ΝX is the correction coefficient, Н_t is the target flight altitude. Then, in the process of a two-dimensional search for the zeros of the specified objective functions F₁ (Н_t, Ν_Х), F₂ (Н_t, Ν_Х), … Fs (Н_t, Ν_Х), the desired flight altitude of the low-flying target Н_t is determined using the Н_t and Ν_Х variables.

EFFECT: more accurate determination of the LFT flight altitude.

1 cl, 9 dwg