METHOD OF DETERMINING GROUND RADIO-FREQUENCY SOURCE COORDINATES WHEN PERFORMING ON-BOARD RADIO-DIRECTION FINDING Russian patent published in 2017 - IPC G01S1/08 G01S5/02 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering and can be used for determining coordinates of ground-based radio-frequency sources (RFS) during radio direction-finding on-board aircraft plane (AP). Said result is achieved due to the fact, that one receives radio signals from onboard direction-finding antenna (DFA), performs frequency selection of radio signals, determines radio-direction finding lines in azimuthal plane of DFA, records obtained data in periodical readings, forms at least one independent pair of intersecting half-planes of ground RFS position, orthogonal to azimuthal plane of DFA, passing through each produced radio-direction finding line, selects and weights pairs of independent data readings, taking into account dependence of dispersions of ground RFS coordinates estimation from mutual location in the space of aircraft plane and ground RFS. provided that additional operations on generating normals to half-planes of ground RFS position, determination of at least one line of ground RFS position as intersection line of independent pair of intersecting half-planes of ground RFS position, parameters of which are determined based on orthogonality to the above said normals, and determining coordinates of ground RFS as points of ground RFS position line intersection with the ground surface using iterative procedure for search. Besides, when selecting and weighting pairs of independent data readings, dependence of dispersions of ground RFS coordinate estimations from parameters of DFA angular orientation and intersection angles of position lines and normals to half-planes of ground RFS position with the ground surface.

EFFECT: achieved technical result – increased accuracy of determining ground RFS coordinates and reduced computational costs when performing on-board radio-direction finding.

1 cl, 5 dwg