Two adaptive detectors for range-spread targets in non-Gaussian clutter

• 出 处: Science China(Information Sciences)
• 发表日期: 2011年02期
• 关键词: clutter spread alarm covariance normalized false invariant steering latter faste

This paper addresses adaptive detection of range-spread target in spherically invariant random vector clutter. Based on the nonadaptive detectors of NSDD-GLRT and SDD-GLRT, two adaptive detectors named ANSDD-GLRT and ASDD-GLRT are devised by replacing the unknown normalized clutter covariance matrix with the sample covariance matrix based on the secondary data. The formulas of detection probability and false alarm probability are deduced. Moreover, the constant false alarm rate properties of both adaptive detectors are assessed and the inffuence of mismatched steering vector on detection probability is analyzed. The experimental results show that the adaptive detectors have an acceptable loss with respect to the nonadaptive counterparts. Furthermore, the ANSDD-GLRT converges much faster than the ASDD-GLRT, however, the latter rejects the misaligned signals more effectively. Both detectors perform well for the uniformly-distributedenergy target, but degenerate for the fluctuating targets. In addition, the correlation between target scatterers results in an additional gain for low signal-to-clutter power ratio. This paper addresses adaptive detection of range-spread targets in spherically invariant random vector clutter. Based on the nonadaptive detectors of NSDD-GLRT and SDD-GLRT, two adaptive detectors named ANSDD-GLRT and ASDD-GLRT are devised by replacing the The normal of clutter covariance matrix with the sample covariance matrix based on the secondary data. The formulas of detection probability and false alarm probability are deduced. Moreover, the constant false alarm rate properties of both adaptive detectors are assessed and the inffuence of mismatched steering vector on The experimental results show that the adaptive detectors have an acceptable loss with respect to the nonadaptive counterparts. However, the latter rejects the misaligned signals more effectively. Both detectors perform well for uniformly-distribute energy target, but degenerate for the fluctuat ing targets. In addition, the correlation between target scatterers results in an additional gain for low signal-to-clutter power ratio.