Patent ID: 9722830
Date: 2017-08-01
CPC Classifications: H04B

Claim:
1. A method of detecting signals comprising: collecting, by a receiver, data comprising noise and a signal in the very low frequency range having an amplitude lower than that of the noise, the signal comprising a preamble and a message; defining a region of interest of the collected data; comparing convolutions of left and right sides of the region of interest; identifying a side of the region of interest that is more likely to contain the preamble, based on the comparison of the convolutions of the left and right sides of the region of interest; defining a plurality of portions within the side of the region of interest that is identified as more likely to contain the preamble; and iteratively comparing two halves of each of the plurality of portions of the region of interest to identify a portion of the region of interest that is more likely to contain the preamble.