The invention discloses a
signal detection method and
system based on iterative
estimation in composite
Gaussian clutter, belonging to the field of
radar target detection. First, it is assumed that
clutter from different distance units has the same
covariance matrix structure, but has unknown power mismatch, and the mismatch amount is a non-random non-negative number. Then, the
clutter covariance matrix estimation value is constructed using the power mismatch amount obtained by the iterative
estimation and the data to be detected, the training sample, and the iterative
estimation. Then, the test statistic is calculated, and the
detection threshold is determined according to the
false alarm probability. Finally, the size between the test statistic and the
detection threshold is compared. If the test statistic is greater than the
detection threshold, it is determined that the target exists, otherwise it is determined that the target does not exist. The detection method and
system of the invention take into account the problem of power mismatch in the training sample in the composite
Gaussian clutter, obtain all the mismatch amounts through iterative estimation, and realize clutter suppression,
signal accumulation and target judgment in an integrated manner, simplify the process, and improve the
detection performance.