DIFFERENTIAL-RANGE METHOD OF DETERMINING COORDINATES OF RADIO-FREQUENCY SOURCES AND APPARATUS REALIZING SAID METHOD Russian patent published in 2018 - IPC G01S3/46 

FIELD: radio engineering.

SUBSTANCE: claimed group of inventions refers to radio engineering and can be used in position determining systems for the purposes of radio monitoring, navigation, active and passive location, guidance, target designation, search and rescue operations. Difference-ranging method for determining the coordinates of a radio-frequency source (IRI), including the placement of four sensors in spaced points with known coordinates (x_i, y_i, z_i), i=1, 2, 3, 4, so that the volume of the tetrahedron V₁₂₃₄ was greater than zero, reception of the signal by each sensor, determination of the relative time delay of the arrival of the signal from the IRI for each sensor, the ranking of the relative delay from the smallest to the largest value assigning the numbers 1 to 4 to the corresponding points, the construction of a coordinate system with start at point 1, the compilation and solution of a system of four nonlinear equations of the form (x-x_ip)²+(y-y_ip)²+(z-z_ip)²=(R+Δr_i)², where: i=1, 2, 3, 4; Δr_i – the difference in the path of the signal from the source of the radio emission to the sensor i; K_ip – the corresponding coordinates of the sensor in the coordinate system; R is the distance to the IRI from the first sensor, the geometrical location of the points described by these functions in the coordinate system are spherical surfaces with centers at the sensor placement points, and the IRI coordinates are defined as the point of intersection of the indicated surfaces. Device implementing the difference-range method of determining the coordinates of the source of radio emission contains sensors located at points 1, 2, 3, 4, with known coordinates such that the volume of the tetrahedron V₁₂₃₄>0, each of which is associated with a subsystem for measuring propagation delays over communication links, after processing in which the data is fed to the subsystem of calculators and then to the registration and/or mapping subsystem. In the subsystem of calculators by software or software and hardware means the proposed method is implemented, which ensures an increase in the speed and accuracy of the unambiguous location of the IRI.

EFFECT: achieved technical result is an increasing in the speed and accuracy of the precise determination of the radio emission source coordinates and is provided due to a significant reduction in the number of settlement operations using a finite number of terms of the infinite series and a significant simplification of the calculated ratios used in the implementation of the claimed method.

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