A model of clutter of airborne multiple-input multiple-output (MIMO) radar in nonhomogeneous environment is formulated based on spherically invariant random vectors (SIRV).The modified asymptotical maximum likelihood (MAML) method is proposed to estimate the singular normalized covariance matrix of clutter and the modified asymptotical generalized likelihood ratio test (MAGLRT) detector is developed based on it.Simulation results reveal that the MAGLRT detector has a great advantage over conventional Gaussian modeled detector
meanwhile the MIMO radar has better detection performance compared with SIMO radar.