RADIOLOCATIONAL DESCENDING CONTROL METHOD AT AIRCRAFT LANDING UNDER CONDITION OF RUNWAY CONTACT VISIBILITY LACK Russian patent published in 2017 - IPC G01S1/16 

FIELD: radio engineering, communication.

SUBSTANCE: essence of the invention consists in detecting deviations of aircraft (AC) from the landing trajectory in the horizontal and vertical planes with the help of an onboard radar station (BRS), performing an autonomous landing control without the use of airfield landing systems. In case of a deviation in the horizontal plane (on course), the asymmetry of the radar image (RI) of the runway (RW) is detected and this information is used to eliminate deviations from the course of landing. The pilot eliminates deviations from the course of landing by combining the straight line mark of the runway centre line with the mark of the ground speed vector. The control of the landing trajectory in the vertical plane is carried out after the detection and measurement of the inclined range to the runway end (D₃). Then the horizontal range is calculated to the runway end (D₄) from the expression where 3 is the flight altitude, the horizontal component of the glide path D₂ is calculated, when flying on a given glide path to the alignment point from the expression where α - the angle of the specified glide path. A flight along the given glide path is provided, when the pilot controls the aircraft in such a way that the following equality is satisfied: D₄=D₂ (that is, when D₄-D₂=0).

EFFECT: increasing the accuracy of the descending control, as well as landing in the runway area, remote from the runway end, which is necessary when obstacles appear at the runway end.

3 cl, 3 dwg