CAJ | 학술논문

当前，各国越来越重视发展和保护本国的海洋权益，利用宽带雷达获取舰船目标的高分辨距离像并进行舰船类型识别逐步成为研究热点。船长是舰船的重要特征信息，对于判定舰船的类型和威胁等级具有重要意义。由于海杂波的时变和复杂性，利用信噪比门限方法确定距离像中舰船目标的边界并估计船长是不稳健的。从舰船类大刚体目标与海表面的运动特征差异出发，详细阐述了基于高分辨距离像多普勒谱分析的舰船长度估计方法，对不含目标距离单元和含目标距离单元多普勒谱的特征差异进行分析。提出分别利用多普勒谱的归一化波形熵特征和距离滑窗内距离单元的多普勒中心频率的均方差特征判定距离单元中目标的有无，实验结果证明了所提方法的有效性。
당전，각국월래월중시발전화보호본국적해양권익，이용관대뢰체획취함선목표적고분변거리상병진행함선류형식별축보성위연구열점。선장시함선적중요특정신식，대우판정함선적류형화위협등급구유중요의의。유우해잡파적시변화복잡성，이용신조비문한방법학정거리상중함선목표적변계병고계선장시불은건적。종함선류대강체목표여해표면적운동특정차이출발，상세천술료기우고분변거리상다보륵보분석적함선장도고계방법，대불함목표거리단원화함목표거리단원다보륵보적특정차이진행분석。제출분별이용다보륵보적귀일화파형적특정화거리활창내거리단원적다보륵중심빈솔적균방차특정판정거리단원중목표적유무，실험결과증명료소제방법적유효성。
The vessel recognition through high range resolution profiles obtained from wideband radar gradually becomes a hot research topic.Ship length as an important feature is significant in determining vessel types and corresponding threat levels.Time variation and complexity of sea cluster make it difficult to get an accurate estimate of ship length with those algorithms which determine ship boundaries based on the specific SNR threshold.In this paper new methods for ship length estimation based on the Doppler spectrum analysis are presented in consideration of the difference in motion characteristics between large rigid body targets and sea cluster.The normalized waveform entropy features of Doppler spectrum and the mean square error of Doppler center frequency in range sliding windows are utilized respectively to decide whether there exist scat-tering points from a vessel in a specific range bin of HRRP.The experiment results demonstrate the validity of the proposed methods.