一种抗瞬态干扰的OTHR机动目标检测算法  

An Anti-Transient Interference Maneuvering Target Detection Algorithm in OTHR

作　　者：李万阁 李会勇[1] 艾慧[1] 胡进峰[1] 李强[2] 

机构地区：[1]电子科技大学电子工程学院,四川成都611731 [2]九江职业技术学院,江西九江332007

出　　处：《雷达科学与技术》2015年第1期11-16,共6页Radar Science and Technology

基　　金：国家自然科学基金(No.61101172;61371184;61101173)

摘　　要：在天波超视距雷达(OTHR)中,机动目标的多普勒谱展宽,会导致相干积累损失,影响目标检测。传统的时频分析方法将目标回波信号投射到时频域中再通过能量积累实现机动目标检测和参数估计,但该方法在瞬态干扰存在的情况下效果较差且计算量过大。考虑到机动目标和瞬态干扰在时间-频率变化率域中的不同特性,提出了一种基于时间-频率变化率分布(TFRD)的机动目标检测算法,该算法通过TFRD构建时间-频率变化率(T-FR)域,并在T-FR域中进行目标参数估计,可以降低瞬态干扰对机动目标检测的影响。经实测数据仿真验证,该算法可以在瞬态干扰存在的情况下有效地检测出机动目标,而传统的WHT(Wigner-Hough-Transform)算法则由于瞬态干扰影响导致检测错误。此外,该文算法避免了使用Hough变换,减小了运算量,使其可以更好地应用于工程中。In over-the-horizon radar（OTHR）,the doppler spectrum expansion of maneuvering target will cause coherent accumulation loss.It is bad for target detection.Traditional time-frequency analysis methods transform the time domain echo signal into the time-frequency domain and achieve maneuvering target detection and parameter estimation through energy accumulation.But the methods are poor under the transient interference and the calculation is large.Considering the different characteristics between maneuvering target and transient interference in time-frequency rate domain,this paper proposes a maneuvering target detection algorithm based on time-frequency rate distribution（TFRD）.The proposed algorithm constructs the time-frequency rate（T-FR）domain by TFRD and achieves parameter estimation.It can reduce the impact of transient interference on maneuvering target detection.Simulation of real data shows that the algorithm can detect maneuvering target effectively with the existence of transient interference.But the traditional WHT（Wigner-Hough-transform）algorithm can not detect the target due to transient interference.In addition,the proposed algorithm avoids the use of Hough transform and thus reduces the calculation,so that it can be applied to the project more appropriately.

关 键 词：天波超视距雷达(OTHR) 瞬态干扰 机动目标检测 时间-频率变化率分布(TFRD) 

分 类 号：TN958.93[电子电信—信号与信息处理] TN957[电子电信—信息与通信工程]