A New Tracking and Imaging Algorithm of Moving Target for Ultra Wideband Through Wall Radar
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摘要: 近场区域的非接触式穿墙目标跟踪成像探测是超宽带脉冲雷达在火灾救援、安全保卫、城市巷战以及生命威胁等方面的一个重要应用。基于超宽带脉冲雷达的边界散射变换和直接散射波形提取的边界估计算法(SEABED)由于其不适用于穿墙条件下运动目标的成像与跟踪的情况，该文结合SEABED算法的成像原理，提出回波时延差关系曲线概念从而利用三角定位原理和坐标转换实现运动目标的成像与跟踪。文中提出的算法假设在近场条件下，针对运动目标场景建立系统模型，通过成像结果和速度值的同时估计，对墙体背后的运动目标的边界和轨迹进行有效估计。仿真结果表明，该算法能够弥补墙体对目标回波的影响，精确度高，达到穿墙目标跟踪成像探测的目的。
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关键词:
- 超宽带脉冲雷达 /
- 运动目标 /
- 跟踪成像 /
- 基于边界散射变换和直接散射波形提取的边界估计算法(SEABED) /
- 时延差曲线
Abstract: The Ultra Wide-Band Short-Pulse (UWB-SP) radar used for detecting targets is a promising technique in fire rescue operations, police awareness, urban-warfare, life-threatening and other fields, and it can be used for noncontact measurement of the tracking and imaging of moving target behind walls. As the Shape Estimation Algorithm based on BST (Boundary Scattering Transform) and Extraction of Directly scattered waves (SEABED) algorithm (a new target localization and identification algorithm) based on the UWB-SP radar is not applicable for that application, this paper proposes a new algorithm to obtain the target shape imaging and track it synchronously using triangle localization method and the difference of time delay. In this paper, the proposed algorithm based on a system model built in the near field can effectively estimate the velocity and track of moving target with the imaging result. Simulation results show that the effect of the wall can be removed visibly and the purpose of the imaging and tracking of moving target can be realized well. -
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