ID	原文	译文
54427	本文对天发船收高频雷达海面目标回波建模问题开展研究，	This paper investigates the problem of modeling target echoes for this radar system.
54428	首先分析了动态空间几何关系变化下目标回波的多普勒频移特性，建立了理想条件下的空时目标回波模型;	Firstly, the Doppler frequency shift characteristics of the target echo under dynamic spatial geometry are analyzed and the space-time target echo model under ideal conditions is established;
54429	在此基础上，引入电离层不规则体和六维摆动空时相位扰动影响，分别构建电离层随机扰动相位仿真器和六维摆动扰动相位模型，	On this basis, introducing the space-time phase perturbation effects of ionospheric irregularities and the six degree of freedom motion, the ionospheric random perturbation phase simulator and the six-dimensional oscillating perturbation phase model are constructed, respectively,
54430	进而建立了天发船收高频雷达扰动目标空时回波模型，	and then the space-time target echo model of the shipborne high frequency radar via hybrid sky-surface wave propagation is established.
54431	实验数据验证了模型的有效性。	Experimental data verify the effectiveness of the model.
54432	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。	Due to the global coverage of Beidou navigation satellite system, it shows the potential to be the opportunistic transmitter in passive radar marine detection.
54433	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。	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.
54434	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;	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.
54435	然后，利用去调频积分变换(DcIT)处理实现回波的长时间积累，	Then, the dechirp integration transform(DcIT) is applied to achieve the long-time integration of each echo.
54436	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;	The incoherent summation of multistatic echoes is performed to accomplish spatial integration, achieving the maritime moving target detection in the Doppler frequency rate domain.