AIRCRAFT GROUND SPEED AND THE CRAB ANGLE MEASURING METHOD Russian patent published in 2018 - IPC G01S13/58 

FIELD: measuring equipment.

SUBSTANCE: invention relates to the measuring equipment, in particular to the aircraft ground speed and the crab angle measuring methods in autonomous navigation systems using electromagnetic waves. In the aircraft ground speed and the crab angle measuring method, consisting in the underlying surface irradiation with radio waves by two antenna systems, each of which is oriented at an angle of θ from each side from its axis in the horizontal plane and at an angle of β₀ in the vertical on, reflected waves reception, mixing with part of the emitted waves and the two Doppler signals selection, calculation of Doppler frequencies ƒ_D1 and ƒ_D2 by these signals spectra maxima, additionally setting the radio waves radiation different frequencies for the first and second antennas ƒ₁ and ƒ₂, selecting the difference frequency signals between these two radiated S₀ and received S_ψ waves, passing the S_ψ signal through the tuned to the frequency filter F=ƒ₁-ƒ₂, measuring the phase between signals S₀ and S_ψ – ψ, by the Δψ phase change relative to the reference signal S₀ for the time interval Δt determining the velocity W_Y vertical component, by the ƒ_D1, ƒ_D2, and W_Y values calculating the ground speed W and the crab angle ϕ.

EFFECT: increase in the measurement accuracy.

1 cl, 3 dwg