METHOD OF DETECTION OF OBSTACLES IN THE HELICOPTER LANDING AREA Russian patent published in 2018 - IPC G01S13/93 

FIELD: radar ranging and radio navigation.

SUBSTANCE: invention relates to helicopter radar landing systems and can be used in their development. Essence of the invention lies in the fact that in the process of vertical descent they receive the reflected signals from angular directions by N receivers installed in sectors with α=2π/N, axis of the DN of the n-th antenna is directed to a point with polar coordinates α_n=α_n-1+2π/N and β=arctg(R/H_of), where n=1…N, α₀=0, R is the radius of the landing zone, the measurement of the height of the helicopter’s flight is carried out by an antenna with a width of DN β₀=2arctg(R/H₀), where is H₀ – height of hovering of the helicopter before landing, measure the distance to the earth's surface in each sector, calculate the height of the range, compare the difference between the measured and calculated heights Δ_n with threshold to h_Δ and if the condition |Δ_n|≥h_Δ decide on the presence of obstacles in this sector when Δ_n>0, or in the central region of the landing zone in the opposite case.

EFFECT: increased probability of detecting obstacles in the landing zone by receiving echo signals directly from the helicopter landing zone, regardless of its height.

1 cl, 2 dwg