关键词: 微弱信号检测, 欠采样与过采样, 凸点检测, 包络分析, 并行运算

Abstract: The most commonly used technology in weak signal detection is using correlation operations to detect whether a known periodic signal exists; however, it is always very complicated and cannot be applied widely. To solve this problem, an envelope analysis based algorithm was proposed from the perspective of mathematical morphology. In this algorithm, salient points were selected from low level envelope to form a higher level envelope of the signal, and finally it converged at the peak position of every target signal in parallel. No priori knowledge about the target signal was needed here and it was also less sensitive of white Gaussian noise. This algorithm is effective in the simulation with signal-to-noise ratio of -10dB, and the measured data demonstrate that it is good at detecting weak signal.

Key words: weak signal detection, under-sampling and over-sampling, salient point detection, envelope analysis, parallel computing