METHOD OF DETERMINING COORDINATES OF AERIAL TARGETS IN A MULTI-POSITION SURVEILLANCE SYSTEM "NAVIGATION SATELLITES - AERIAL TARGETS - RECEIVER" Russian patent published in 2019 - IPC G01S13/06 

FIELD: radar ranging and radio navigation.

SUBSTANCE: invention relates to radar ranging, in particular, to systems for determining location of aircrafts by a multi-position non-radiating observation system "navigation satellites – aerial targets – receiver", in which signals of navigation satellites of global navigation satellite systems (GNSS) are used to illuminate aerial targets. In a multi-position surveillance system consisting of N satellites and a receiver, determining coordinates of aerial targets is carried out based on measurements on scattered signals of distances R_nm=r_nm+r_m (r_nm is distance from n-th satellite, n = 1, 2, …, N, to m-th air target, m = 1, 2, …, M, r_m is distance from m-th target to receiver), along propagation path "n-th navigation satellite – m-th air target – navigation receiver" is calculated N^M possible versions of coordinates of aerial targets x_cm, y_cm, z_cm using corresponding system of equations, estimating unknown coordinates x_cm, y_cm and z_cm is found by solving system of equations using apparatus of pseudoinverse matrices. After calculating N^M possible versions of coordinates of targets associated with N^M possible combinations of distances, according to a certain criterion, a decision is made on whether the true coordinates of a target are true.

EFFECT: determining location of several air targets by multi-position radar system based on measurements of sums of distances from targets to satellites and receiver, coordinates of which are known, by direct, non-iterative method, using direct solution of system of nonlinear equations for coordinates calculation.

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