METHOD FOR GUIDANCE OF AIRCRAFT ON FIRE SOURCE AND EXTINGUISHING THEREOF WITH FIRE EXTINGUISHING LIQUID Russian patent published in 2020 - IPC A62C2/00 G01J1/00 

FIELD: physics.

SUBSTANCE: disclosed method relates to methods of detecting, determining coordinates of fire centres and selecting an optimum moment for discharging extinguishing liquid from an aircraft. To guide the aircraft, an ultraviolet radiation sensor is used with a radiation detection unit in the wavelength range of 250–280 nm, which provides a sun-blind mode of operation, having a monitor for visualizing UV radiation. Ultraviolet radiation sensor is placed outside the aircraft so that the axis of view of the sensor, initially coinciding with the construction axis of the aircraft, deviates from the nadir by an angle of β0, depending on the speed of the aircraft and its height. When receiving on the monitor screen a spot indicating an ignition source, determining on the basis of the Cartesian coordinates x and y, taking into account the aircraft drift in the presence of wind, azimuth angle α of the fire centre, on which the aircraft is turned and the angle of view of the fire centre is determined. In the case of flat terrain, the horizontal distance to the fire centre L and the inclined distance to the fire centre R are determined. From the known L, R, the flight altitude H and the flight speed V, taking into account the water cloud deposition model after its dropping from the aircraft, calculating an optimum moment discharge of extinguishing liquid. In case of uneven terrain after turning the carrier on the target, if the fire is located on the elevation or in the lower part of the relief, the height of the fire centre relative to the flat part of the relief h is incremented or decreased. Time of flight, based on the type of aircraft and its speed, is selected minimum to achieve sufficient accuracy of determining the moment of discharge of extinguishing liquid. Based on the calculated parameters, values of horizontal distances to a fire centre for cases of uneven relief are determined, and at known values of speed and altitude of flight of an aircraft, as well as a model of water cloud settlement, the moment of optimum discharge of extinguishing liquid is calculated.

EFFECT: enabling creation of method of guiding aircraft to fire centre by means of UV-C device operating at wavelengths of 250–280 nm, determination of angular coordinates of the fire centre on-board the carrier and accurate actuation of the reset device in conditions of rough terrain, use of coordinate information for guidance of the aircraft to the fire centre and selection of the optimum time for discharge of the extinguishing liquid.

1 cl, 7 dwg