The application discloses a mismatch
signal robust detection method under a
main lobe interference background and relates to the technical field of
signal processing, and comprises the following steps: obtaining a to-be-detected
signal, constructing a multivariate
hypothesis testing problem, constructing a penalty
detector, solving the multivariate
hypothesis testing problem, and obtaining a detection statistic of the to-be-detected signal; in the solving process, unknown parameters are estimated, and the
estimation result is used for solving the multivariate
hypothesis testing problem; according to the detection statistic, a distance gate
estimation result and a
fuzzy number estimation result are obtained; whether the
fuzzy number estimation result is equal to preset target distance fuzzy area
prior information is judged, if the
fuzzy number estimation result is equal to the preset target distance fuzzy area
prior information, a real target exists in the to-be-detected signal, and a target distance gate position is obtained, and if the fuzzy number
estimation result is not equal to the preset target distance fuzzy area
prior information, a real target does not exist in the to-be-detected signal. The application can improve the
detection performance under a signal mismatch condition.