METHOD OF DETERMINING GEOGRAPHIC COORDINATES OF AN UNDERWATER OBJECT Russian patent published in 2020 - IPC G01S15/42 

FIELD: radar ranging and radio navigation.

SUBSTANCE: invention relates to underwater navigation and is intended to increase efficiency of obtaining of its geographical coordinates by underwater object (UO) and reduction of economic costs when solving UO tasks due to use of one drifting navigation beacon (DNB) instead of at least three. Pressure sensor and a special computer with at least 32-bit grid are installed on the UO. UO requests DNB with its geographical coordinates (latitude B_D and longitude L_D), obtained by means of global navigation system (GNSS), with simultaneous measurement of distance (D) to DNB and bearing (α) on it. Obtained geographical coordinates of DNB in special computer are converted to rectangular spatial coordinates (X, Y, Z), and then calculating spherical (latitude ϕ_D and longitude λ_D) on terrestrial sphere, relating to common-earth ellipsoid in point of location of DNB, from value of pressure P at depth of location of UO, obtained from pressure sensor, in special computer, pressure P is recalculated into depth H of detection of UO and distance D into central angle ϕ terrestrial sphere, then by spherical coordinates of DNB ϕ_D and λ_D, central angle ϕ spherical UO coordinates (latitude ϕ_UO and longitude λ_UO) are calculated and estimation of accuracy of obtained solution, then by spherical coordinates ϕ_UO and λ_UO calculating rectangular spatial coordinates of the UO (X_UO, Y_UO, Z_UO) and recalculating spherical coordinates ϕ_UO and λ_UO in geographical coordinates of latitude B_UO and longitude L_UO.

EFFECT: development of a method for rapid acquisition of geographical coordinates by UO, equipped with a transceiver of a hydroacoustic navigation system operating in the mode of an ultrashort base or short base – on one drifting navigation beacon.

1 cl, 6 dwg