摘要
紧凑型地波雷达发射功率低、回波信噪比低,目标检测难度大,在目标跟踪时由于目标漏检经常出现航迹断裂。为了提升其目标检测性能,提出了一种基于检测-跟踪联动的弱目标自适应检测方法。当跟踪器检测到目标航迹无法关联到新点迹时,将当前目标预测状态反馈至检测器;检测器在距离-多普勒谱上建立局部检测波门,采用二元假设检验法感知波门内的检测背景,根据不同的检测背景选取适用的检测门限调整方法,降低恒虚警检测的门限,判定是否有弱目标被检出。若能够检出目标,对其进行测向后将新点迹发送至跟踪器进行处理。利用实测数据开展了目标检测与跟踪实验,结果表明:与先检测后跟踪方法相比,该方法得到的目标航迹时长增加了29.76%,平均延长了19.25 min。
The low transmission power and low signal-to-noise ratio increase the challenges of target detection for compact High-Frequency Surface Wave Radar(HFSWR).Track fragmentation often occurs due to missed detections during the tracking procedure.An adaptive weak target detection method using joint detection and tracking is suggested to enhance its detection performance.The tracker will communicate back the current target prediction state to the detector when it discovers that a target track can not be connected to any new plot.The detector establishes a local detection gate on the Range-Doppler(R-D)spectrum,and the detection background is perceived using the binary hypothesis test.According to the detected background,an appropriate detection threshold adjustment method is used to lower the Constant False Alarm Rate(CFAR)detection threshold and determines whether a weak target can be detected.The newly generated plot is obtained after the azimuth estimate and transmitted to the tracker for additional processing if a target is detected.The experimental results with field data reveal that the track length obtained by the proposed method is 29.76%longer than that of the detection before tracking methods,and the tracking time increases by 19.25 minutes on average.
作者
孙伟峰
李小彤
纪永刚
戴永寿
SUN Weifeng;LI Xiaotong;JI Yonggang;DAI Yongshou(College of Oceanography and Space Informatics,China University of Petroleum(East China),Qingdao 266580,China)
出处
《电子与信息学报》
EI
CSCD
北大核心
2023年第8期2955-2964,共10页
Journal of Electronics & Information Technology
基金
国家自然科学基金(62071493,61831010)。
关键词
紧凑型地波雷达
弱目标检测
检测-跟踪联动
检测背景感知
多策略检测
Compact HFSWR
Weak target detection
Joint detection and tracking
Detection background perception
Multi-strategy detection
