Covariance matrix Covariance matrices 8 Eigenvalues and eigenfunctions 5 Clutter (information theory) 4 Inverse problems 4 Kalman filters 4 Optimization 4 Adaptive filtering 3 Adaptive filters 3 Array processing 3 Covariance matrix estimation 3 Direction of arrival 3 Estimation 3 Interference 3 Kalman filter algorithms 3 Marine radar 3 Mean square error 3 Measurement Noise 3 Numerical methods 3 Position 3 Radar measurement 3 Radar target tracking 3 Sage-Husa adaptive Kalman filters 3 Sage-husa 3 Sage–Husa adaptive Kalman filter 3 Square root sage–husa adaptive robust kalman filter 3 Square-root 3 Statistical tests 3 Surface target 3 Target tracking 3