公开(公告)号：KR101323592B1

公开(公告)日：2013-10-30

申请号：KR1020130088729

申请日：2013-07-26

Applicant: 국방과학연구소

Inventor： 정명준 ,  김진석 ,  이승우 ,  황수복

IPC: G01S7/527 ,  G01S7/539 ,  G01S15/88

Abstract: PURPOSE: A demon process performance improvement method is provided to indicate a necessary performance with a small calculation amount. CONSTITUTION: A band pass filter block generates a divided band signal by inputting a propeller noise signal (S400, S410). A square calculation block executes square calculation for the generated divided band signal (S420). A low pass filter block removes a high frequency signal from the divided band signal and a direct current (DC) signal from the divided band signal in which the high frequency signal is removed (S430). A fast Fourier transform (FFT) block executes FFT for the divided band signal in which the DC signal is removed (S440). A noise regulation block generates a spectrum by regulating noise in order to remove background noise in the divided band signal (S450). An averaging unit generates an average spectrum by averaging the generated spectrum (S460). [Reference numerals] (AA) Start; (BB) End; (S400) Input a noise signal; (S410) Generate a split band signal using multiple band pass filters; (S420) Perform a square process in a selected split frequency band; (S430) Removal a high frequency signal and a DC signal; (S440) Convert a time area signal into a frequency area; (S450) Generate a spectrum by regulating noise in order to remove background noise; (S460) Generate an average spectrum by averaging the generated spectrum

Abstract translation: 目的：提供恶化过程性能改进方法，以小计算量表示必要的性能。 构成：带通滤波器块通过输入螺旋桨噪声信号（S400，S410）产生分频带信号。 平方计算块对所生成的分割频带信号执行平方运算（S420）。 低通滤波器块从分频带信号中去除高频信号，并从去除高频信号的分频带信号中去除直流（DC）信号（S430）。 快速傅立叶变换（FFT）块对去除了直流信号的分割频带信号执行FFT（S440）。 噪声调节块通过调节噪声产生频谱，以消除分频频带信号中的背景噪声（S450）。 平均单元通过对生成的频谱进行平均来生成平均频谱（S460）。 （附图标记）（AA）开始; （BB）结束; （S400）输入噪声信号; （S410）使用多个带通滤波器产生分频信号; （S420）在选择的分割频带中进行平方处理; （S430）去除高频信号和直流信号; （S440）将时区信号转换为频域; （S450）为了消除背景噪声，通过调节噪声产生频谱; （S460）通过对产生的频谱进行平均生成平均频谱