CAJ | 학술논문

由声学方法进行直升机等目标的探测时,以往算法大多没有充分利用其谐波性质.针对此问题,提出了基于时频面霍夫变换的谐波族检测方法.使用谐波小波变换方法求得含噪声谐波族信号的时频分布,并进行Hough变换;基于频率分集融合处理技术将各阶谱线在变换域的强度综合,作为对目标的检测量.仿真计算结果表明,该方法能准确检测出谐波族信号基频及其变化率,并在信噪比较低时依然提供幅度较高的检测量,具有较好的应用前景.
유성학방법진행직승궤등목표적탐측시,이왕산법대다몰유충분이용기해파성질.침대차문제,제출료기우시빈면곽부변환적해파족검측방법.사용해파소파변환방법구득함조성해파족신호적시빈분포,병진행Hough변환;기우빈솔분집융합처리기술장각계보선재변환역적강도종합,작위대목표적검측량.방진계산결과표명,해방법능준학검측출해파족신호기빈급기변화솔,병재신조비교저시의연제공폭도교고적검측량,구유교호적응용전경.
To improve the detection capability for propeller-driven military targets such as helicopter,unmanned aerial vehicle and anti-submarine aircraft,making use of the harmonic property of their noise signal is an effective way.The harmonic signal set is processed by using the time-frequency distribution based on the harmonic wavelet transformation algorithm and also by using the Hough transformation algorithm.The relationship between the parameters of the Hough transformation and parameters of the harmonic signal set is deduced under situation of stable or linear shifting frequency.Algorithm of searching the base frequency is established.Simulation results show that this algorithm can accurately detect the base frequency and the shifting rate of the harmonic signal set,and provide good detection ability under low SNR.