摘要
无论在军事上还是在民用中,对大范围区域内的运动目标进行实时监视与检测都非常重要,传统区域监视采用机载扫描模式(ScanSAR),受到国界领空限制,并且ScanSAR固有的特性导致其不适用于在星载平台上进行运动目标区域监视。该文提出一种基于斜视TOPSAR的星载区域监视GMTI方法。该方法采用TOPSAR模式,改善了ScanSAR在星载条件下的低信杂比和信噪比问题。该方法利用斜视TOPSAR全孔径成像算法进行成像,并采用相位中心偏置天线(DPCA)和双门限单元平均恒虚警(CFAR)检测方法对动目标进行检测,利用推导出的运动目标的干涉相位与速度关系,对运动目标的速度进行估计和定位。另外,该文还分析了真实数据和仿真数据之间可能存在的差异及如何降低差异带来的影响。仿真结果验证了该方法的有效性。
For military or civilian activities, it is important to monitor the direction of moving targets in a wide area. Traditional regional monitoring uses the airborne scanning mode （ScanSAR） within the limits of the national airspace. The inherent characteristics of ScanSAR do not apply to spaceborne regional monitoring. In this paper, the spaceborne regional surveillance Ground Moving Target Indication （GMTI） mode based on squint-TOPSAR is proposed. The proposed method uses the TOPSAR mode that improves the low SNR of spaceborne ScanSAR. The full-aperture imaging algorithm for squint-TOPSAR is used in data focusing. The Displaced Phase Center Antenna （DPCA） and Constant False Alarm Rate （CFAR） methods are used to accomplish the moving target indication. The relation between the interferometric phase and the speed of moving target is used to estimate the speed of the moving target and mark the target location in the SAR image. The differences between real and simulation data are analyzed. The simulation results demonstrate the effectiveness of the proposed method.
出处
《雷达学报（中英文）》
CSCD
2015年第4期401-410,共10页
Journal of Radars
基金
国家部委基金~~
