TY JOUR TI Application of matrix decomposition to construct analytical models of gravity anomalies KW gravity field KW Bouguer anomalies KW analytical field model KW point masses KW system of linear equations KW Cholesky decomposition KW singular value decomposition KW QR decomposition KW regularization KW Arctic KW Antarctica. JO Vestnik AGGE AU Dolgal', A.S. PY 2026 IS PB Association of Geologists, Geophysicists and Engineers