无源多基雷达海面运动目标检测与定位方法

A Maritime Moving Target Detection and Localization Method for Passive Multistatic Radar

由于北斗卫星导航系统全球覆盖的特性,以其为辐射源构成无源雷达在海面监测方向具有应用潜力。本文针对多颗北斗卫星为辐射源所构成的无源多基雷达,提出了一种目标回波空时联合积累方法,可实现海面运动目标的检测与定位。首先,本文提出距离反转-方位伸缩变换(RRAST),将各二维时域回波转换为一维方位信号,并将其多普勒质心置零;然后,利用去调频积分变换(DcIT)处理实现回波的长时间积累,并非相干叠加多源回波实现目标回波的空间积累,在多普勒调频率域实现海面运动目标的有效检测;最后,将多源回波均映射到目标运动参数域,根据峰值位置实现目标的定位与速度估计。仿真实验结果表明,本方法可在低信噪比条件下实现海面运动目标的检测与定位。

Due to the global coverage of Beidou navigation satellite system,it shows the potential to be the opportunistic transmitter in passive radar marine detection.This paper focus on the passive multistatic radar constituted by multiple Beidou satellites,and proposes a target echo space-time integration method to achieve maritime moving target detection and localization.First,this paper proposes a range reversal and azimuth stretching transform(RRAST),which converts each two-dimensional echo in fast-time and slow-time domain into a one-dimensional azimuth signal,and sets the Doppler centroid of each echo to zero.Then,the dechirp integration transform(DcIT)is applied to achieve the long-time integration of each echo.The incoherent summation of multistatic echoes is performed to accomplish spatial integration,achieving the maritime moving target detection in the Doppler frequency rate domain.Finally,the multistatic echoes are all projected to the target motion parameter domain,and the target localization and velocity estimation can be achieved according to the peak position.The simulation results show that the proposed method can realize the maritime moving target detection and localization under the condition of low signal-to-noise ratio.