Motion compensation on baseline oscillations for distributed array SAR by combining interferograms and inertial measurement
Motion compensation on baseline oscillations for distributed array SAR by combining interferograms and inertial measurement
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DOI：
10.1049/iet-rsn.2016.0572
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发表时间：
2017-04
影响因子：
1.7
通讯作者：
Bingnan Wang;M. Xiang;Longyong Chen
中科院分区：
文献类型：
--
作者：
Bingnan Wang;M. Xiang;Longyong Chen
分布式阵列合成孔径雷达（DASAR），其中多个分布式天线被安装在一个交叉跟踪，有应用，包括多基线干涉测量，多输入多输出SAR，和层析成像。然而，这种灵活的成像几何结构需要精确测量每个天线的运动。通常使用高精度导航系统，但为每个天线配置单独的导航系统具有挑战性且成本高昂。在这项研究中，作者提出了一种新的运动补偿方案的DASAR相结合的干涉图和惯性测量。作者制作了一个刚性基线（RB）和多个柔性基线（FB）的配置，配备了一个大型和精确的位置和定向系统，并与多个较小的，低精度的惯性导航系统（INS）的运动测量。作者介绍了一种新的鲁棒算法的基础上的功能相关的RB和FB干涉，并使用此来估计相对运动。最后设计了卡尔曼滤波器对数据库估计结果和惯性测量结果进行融合。这结合了缓慢运动的数据估计和快速运动的惯性测量的优势。仿真和机载实验的结果都证实了这种新方法的成功，允许一个小的INS用于运动补偿DASAR应用。
Distributed array synthetic aperture radar (DASAR), in which multiple distributed antennas are mounted on a crosstrack, has applications that include multibaseline interferometry, multiple-input multiple-output SAR, and tomography. However, this flexible imaging geometry requires accurate measurement of the movements of each antenna. High-precision navigation systems are commonly used, but configuring a separate navigational system for each antenna is challenging and costly. In this study, the authors proposed a novel motion compensation scheme for DASAR that combines inteferograms and inertial measurement. The authors fabricated a rigid baseline (RB) and multiple flexible baseline (FB) configuration, fitted with a large and accurate position and orientation system and with multiple smaller, low-precision inertial navigation systems (INS) for motion measurement. The authors introduced a new robust algorithm based on a function relating RB and FB interferometry, and used this to estimate the relative movements. Finally, a Kalman filter was designed to integrate the results of databased estimation and inertial measurement. This combined the strengths of data estimation for slow movement and inertial measurement for fast movement. The results of both simulations and airborne experiments confirmed the success of this novel approach in allowing a small INS to be used for motion compensation in DASAR applications.