Fixed time acquiring method under continuous system multipath channel

The invention provides a fixed time acquiring method under a continuous system multipath channel. The method comprises steps of acquiring a main peak through maximum likelihood searching; and acquiring a first arrival diameter through generalized likelihood ratio and peak detection. According to the fixed time acquiring method under the continuous system multipath channel, the maximum likelihood searching and the generalized likelihood ratio and peak detection are adopted at the same time to avoid using an absolute threshold, so that the robustness of a search algorithm is obviously improved, and the system can work in occasions with larger signal to noise ratio dynamic range.