时频空交叠信号的脉内调制类型识别算法  

Recognition Algorithm of Intra-pulse Modulation Types of Time-frequency-space Overlapping Signals

作　　者：李霄[1] 徐才宏[1] 

机构地区：[1]中国船舶重工集团公司第723研究所,扬州225001

出　　处：《舰船电子对抗》2016年第1期1-8,35,共9页Shipboard Electronic Countermeasure

摘　　要：复杂电磁环境下的雷达信号分选技术充分利用被侦察信号的特征信息,把分属于不同信号源的雷达脉冲流分离开来。随着脉冲流密度的增加,出现了一些在时频空3个维度上均严重交叠的脉冲,这些脉冲的辐射源信息差别很小,以至于识别算法无法正确将它们区分,进而造成脉冲丢失或错误识别,使得信号分选的性能大大下降。以6种常见的脉内调制类型脉冲为研究对象,针对脉冲之间两两交叠的情况,提出了基于部分快速傅里叶变换算法的时频空交叠信号脉内调制类型识别算法,并通过一系列仿真分析了算法的性能,证明了算法能够有效地分辨频域和空域高度重叠但时域不完全重叠的信号脉冲流,提高信号分选的性能。Radar signal sorting technology in complex electromagnetic environment makes full use of the characteristic information of the detected signal, and separates the radar pulse streams belonging to different signal sources. With the increase of pulse stream density, there are some pulses se- riously overlapped in the time domain,frequency domain and the spatial domain. The differences of emitter description words of these pulses are so small that recognition algorithm cannot correctly distinguish them, which resulted in pulse missing or wrong recognition and the performance of sig- nal sorting is greatly decreased. Taking six kinds of common intra pulse modulation type pulses as the research objects,for the pairwise overlapping between pulses, this paper puts forward the intrapulse modulation type recognition algorithm to separate these overlapping pulses based on part-fast Fourier transform algorithm, and make a series of simulation analysis to test the algorithm performance. It is proved that the algorithm can effectively distinguish the pulse steam which overlap highly in frequency domain and space domain, but does not eompletely overlap in time domain,and the performance of radar signal sorting is improved.

关 键 词：信号分选 时频空交叠信号 脉内调制类型识别 部分快速傅里叶变换 

分 类 号：TN971.1[电子电信—信号与信息处理]