METHOD FOR HIGH-PRECISION DETERMINATION OF THE ALTITUDE OF A LOW-FLYING TARGET BY A MONOPULSE TRACKING RADAR Russian patent published in 2022 - IPC G01S13/44 

FIELD: radar technology.

SUBSTANCE: invention relates to radar and can be used in a radar station tracking low-flying targets (LFT) at small angles of location in the presence of interfering reflections from the underlying surface. In the claimed method, probing radar signals are emitted, reflected echo signals are received from the LFT and from the underlying surface and processed to determine the range to the LFT, its flight altitude and the relative geometric location of the radar and LFT. At the same time, the radar uses an antenna with 4 quadrants A, B, C, D of the canvas, implementing total-difference processing along the angle of location and in an inclined plane. An additional diagonal difference channel is used, and in order to obtain a non-zero error signal Aγ from this additional channel, when accompanying an LFT in an inclined plane, a detuning in an inclined plane of β_p degrees is performed. The method is carried out in 3 consecutive stages: at the 1^st stage, the exact coordinates of the radar dislocation are entered into the radar computer memory, at the 2^nd stage, the LFT is tracked using the radar, at each clock cycle of the radar operation, the values of the signal module of the angular difference channel Δv and the values of the error signal Δγ of the additional diagonal difference channel are stored in the radar computer, as well as the value of the range R₂ from the radar to the target, the value of the target speed V_T, determined by the radar, then, in the resulting array of the error signal Δγ of the diagonal difference channel, the maximum and the corresponding time T₁ are determined, at which the range from the radar to the target R₁ is determined, at the 3^rd stage, the sum of the error signal Δγ of the diagonal difference channel Sum_Δγ in degrees and the sum of the signal of the tracking system (TS) ε_Л is determined by the angle of the seat Sum_TS in degrees, and then the altitude of the target is determined, and as a result of processing the true value of the altitude of the flight of the LFT H_T is determined.

EFFECT: increase in the accuracy of determining the altitude of the LFT flight while simplifying the design of the radar antenna system.

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