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Target detection and bearing estimation are mainly obtained through spectral analysis of received signals. The detection performance of the periodogram and its variants methods is evaluated. The variants methods Performance evaluation through the Receiver Operating Characteristics (ROCs) are presented and compared from the viewpoint of probability of detection (Pd), probability of false alarm (Pla) by computer simulation. When the sinusoid frequency does not correspond to one of the spectral bins (mid-bin frequency situation), the performance of all the mentioned detectors degrades. This research investigates the development of a bearing estimation method using Fast Orthogonal Search (FOS) to enhance spectral estimation which, improves both target detection and bearing estimation in case of low SNR inputs.