METHOD FOR FINDING COORDINATES OF GROUND RADIATION SOURCE FROM AIRCRAFT AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC G01S11/02 G01S5/04 G01S13/72 G05D1/12 

FIELD: methods for finding the coordinates.

SUBSTANCE: methods for finding the coordinates of a ground-based radiation source. Iinvention utilizes the azimuthal method using a phase direction finder placed on board an aircraft flying in the direction of the radiation source. In the claimed method, the horizontal flight of the aircraft is additionally continued with a constant course and the aircraft is consistently maneuverer in the form of a roll in different directions, while at each i-th manoeuvre in the extreme positions of the roll and at zero roll the angle to the radiation source is measured. The angles to the radiation source are assessed using a recurrent Kalman filter separately for left, right and zero roll of the aircraft. In the case of zero roll of the aircraft, the value of the estimated angle to the radiation source is remembered and the approximate range to the radiation source is calculated. In the case of a non-zero roll, using the obtained estimate of the angle to the radiation source, the range to it is calculated, the calculated range to the radiation source is estimated using a recurrent Kalman filter, with the first four initial values of the angle to the radiation source corresponding to sequentially zero, left (right) , zero and right (left) rolls of the aircraft are assigned the angles to the radiation source measured by the phase direction finder, and the initial value of the range estimate is assigned the first calculated range to the radiation source at a non-zero roll. By assessing the angle to the radiation source in the absence of aircraft roll and assessing the range to the radiation source, the coordinates of the radiation source relative to the aircraft are found. A device for implementing the method is also claimed, comprising a phase direction finder, an aircraft roll meter, an aircraft altitude meter, a storage device and a range calculator, whereas a synchronizer, an aircraft speed meter, a comparison unit, a data input unit, a recurrent Kalman filter for angle estimation, and a recurrent Kalman filter for range estimates and range calculator at zero roll are additionally introduced.

EFFECT: increased accuracy of finding the coordinates of a radiation source from an aircraft.

2 cl, 6 dwg