基于合成孔径和稀疏重建的高精度DOA估计
Yang Fang1, Xiaolong Wei2, Jianjun Ma3
1State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Research Centre of NDT and Structural Integrity Evaluation, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Sensors (Basel, Switzerland)
|November 14, 2023
概括
本研究提出了一种新的空间合成光圈模型,用于准确的到达方向 (DOA) 估计,克服了飞行平台上小型天线的局限性. 该方法实现了精确的角度估计,误差低于1°,以改进目标跟踪.
科学领域:
- 电磁学和信号处理
- 航空航天工程和导航工程
背景情况:
- 到达方向 (DOA) 估计的准确性通常受天线光圈大小和阵列元素数量限制,特别是在空间有限的飞行平台上.
- 由于硬件限制,现有的方法在分辨率和自由度方面面临挑战,影响精确的DOA估计.
研究的目的:
- 引入一种精确的DOA估计方法,利用空间合成光圈模型来克服有限的天线尺寸所造成的精度限制.
- 通过一种新的两阶段战略,提高DOA估计的效率和精度.
- 解决离网问题,提高连贯性和角度闪目标的准确性.
主要方法:
- 采用直角匹配追踪 (OMP) 进行初始角度估计和OMP-RELAX用于使用合成阵列样本进行精细估计的两阶段方法.
- 将贝叶斯参数估计与字典序列精细化整合在一起,以处理离网问题并提高准确性.
- 使用稀疏的重建技术来提高效率和准确性,避免细网格分析.
主要成果:
- 拟议的方法有效地利用空间合成光圈进行精确的DOA估计,减轻原子直角和角离网的挑战.
- 在模拟和实验中,目标角度估计错误始终被限制在1°以内.
- 该方法通过分析目标状态,方向角度,空间采样点和目标距离的影响来证明其弹性和适应性.
结论:
- 空间合成光圈模型为在空间限制下准确的DOA估计提供了有效的解决方案.
- 阶段性稀疏重建策略显著提高了效率和准确性,特别是在具有挑战性的目标场景中.
- 该方法为空载平台的DOA估计提供了强大的和可适应的方法.
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