TY JOUR TI Mathematical model of optimal degenerate continuous-discrete state estimation of an autonomous unmanned underwater vehicle KW degenerate estimation KW continuous-discrete Kalman filter KW autonomous unmanned underwater vehicle KW navigation KW optimal observer KW degenerated noise matrix JO Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics AU Kramar', V.. AU Ko, D.. AU Lipko, I.. AU Yakunin, R.. PY 2026 IS 20260 PB Astrakhan State Technical University