The invention provides an
underwater communication node wake-up
signal detection method based on frequency point existence probability. The method comprises the steps: step 1, a
transmitter transmitsa wake-up
signal s(t); step 2, a
receiver receives a
signal with the duration of N*T, and the
signal processing duration of each time is T; step 3, the confidence coefficient pn of a
chip is set, n is1, 2, ..., N, and qn is compared with pn; if qn is detected to be less than pn, a fact that the signal is not a wake-up signal is judged, the first section of the received signal is abandoned by thereceiver, backwards supplementing is carried out, and detection is restarted; when qn is greater than or equal to pn, the
receiver repeats the step 2, the existence probability of the next frequency point is detected according to the frequency sequence until all qn is greater than or equal to pn, and the step 4 is carried out; and step 4, the total confidence coefficient Q is set. According to themethod, the multi-frequency wake-up signals with the same duration are designed,
spectral analysis is performed on the received signals in combination with segmented
Fourier transform, the existenceprobability of specific frequency points is calculated to judge the signals, and the problems that an existing wake-up detection method is poor in anti-interference capacity, high in omission ratio, high in
false alarm probability and the like are solved.