基于FPGA的自动门限线谱检测研究

Line-spectrum Detection of Automatic Threshold Based on FPGA

摘要:

由于海洋环境噪声的起伏变化，采用固定门限来进行线谱检测容易造成线谱的漏报或伪峰的误识。根据背景噪声方差的变化采取自动门限可更好地适应背景的变化，能使线谱检测达到更好的效果。通过仿真对采用固定门限和自动门限的检测方法进行了研究和分析，验证了自动门限法的有效性，并采用 FPGA 实现了自动门限线谱检测算法。

关键词:线谱检测;方差;自动门限;FPGA

Abstract:

Due to the changes of ocean ambient noise，using fixed threshold for line-spectrum detection may easily cause the omission of line-spectrum or misjudgment of spurious peak. According to the change of background noise variance，the automatic threshold is used to better adapt to the change of the background，which makes the line-spectrum detection achieve a better effect. Through the simulation of using fixed threshold and automatic threshold to detect the line-spectrum，the advantages of automatic threshold is validated，and the FPGA is used to realize the algorithm for the automatic threshold line-spectrum detection.

Key words:line-spectrum detection;variance;automatic threshold;FPGA