Micro-motion Parameters Estimation of Ballistic Targets Based on Wide-band Radar Three Dimensional Interferometry
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摘要:
宽带雷达微动目标3维干涉测量可为目标运动几何参数估计提供重要信息。该文针对宽带雷达斜视3维干涉测量微动目标参数估计，提出一种斜视校正干涉测量微动几何参数估计方法。方法对L型天线阵列中各天线接收回波进行干涉测距测角，通过建立2元2次非线性方程和坐标变换实现斜视扭曲校正，得到目标散射中心3维运动轨迹，继而采用滤波和优化求解实现目标微动几何参数估计，有效提高了微动目标运动几何参数估计准确性和平滑稳健性。
Abstract:Three dimensional interferometry of wide-band radar can provide crucial information for estimating the micro-motion and geometric parameters of targets. For estimation of the micro-motion parameters via three dimensional interferometry in the case of squint observing mode, an algorithm for micro-motion and geometric parameters based on squint calibration is proposed. The algorithm performs ranging and angle measuring for each antenna receiving echo in an L formation array. Moreover, the squint distortion is calibrated and three dimensional trajectories of scattering centers are obtained via establishing two elements and quadratic nonlinear equations and coordinate transformation. In addition, smoothing filtering and optimization are used to retrieve micro-motion and geometry parameters. The effectiveness and robustness of the proposed algorithm is confirmed via extensive experiments.
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表 1 实验锥体目标参数
参数 数值 锥体高度H (m) 0.96 质心到锥顶距离d (m) 0.64 底面半径r (m) 0.25 自旋频率fs (Hz) 2 锥旋频率fz (Hz) 3 进动角θ (°) 10 
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表 2 雷达系统的主要参数
参数 数值 载频f0 (GHz) 10 带宽B (GHz) 1 脉冲宽度tp (μs) 10 脉冲重复周期prf (Hz) 100 驻留时间T (s) 1 基线长L (m) 200
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表 3 曲线估计实验结果相似度(%)
锥顶散射点x 锥顶散射点y 锥顶散射点z 锥底散射点x 锥底散射点y 锥底散射点z 文献[12]干涉测量 68.26 60.42 88.72 62.93 64.91 82.73 斜视校正干涉测量 88.56 90.41 96.59 90.84 91.24 87.28
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表 4 目标参数估计结果
进动频率${f_c}\left( {\rm Hz} \right)$ 进动角$\theta \left( {^ \circ } \right)$ 半锥角$\eta \left( {^ \circ } \right)$ 锥体高度$H\left( {\rm m} \right)$ 底面半径$r\left( {\rm m} \right)$ 真实值 3 10.00 14.59 0.96 0.25 平滑处理估计值 3 9.60 15.25 0.95 0.26 未平滑处理估计值 3 12.49 18.17 0.87 0.31
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