Research on DOA Estimation Algorithm Based on Sparse Spatial Fusion
首发时间:2020-05-20
Abstract:The note on the theory of using the compressed sensing theory to estimate the angle of arrival of the array signal in the intelligent vehicle system based on radar-communication is the spatial sparse partitioning and the optimization of the sparse reconstruction algorithm. Different partitioning methods will result in different array flow patterns, and the construction of array flow patterns is the basis of algorithm estimation. At present, the establishment of the sparse model is simply based on the equal angle or the equal sinusoidal division method. However, in the normal and end-fire directions, the orthogonality of the two is different, and the estimation results are also different. To this end, this paper designs a spatial sparse partitioning model combining the equal sinusoidal and the equal angle division. The simulation shows that this model has certain advantages compared with the traditional division method. In addition, in order to optimize the performance of the SAMP algorithm in integrated systems, this paper proposes an improved matching tracking algorithm. Based on the SAMP algorithm, this algorithm sets strict comparison of residual values as termination conditions, and automatically adjusts the number of atoms in the candidate set through an adaptive process to achieve accurate signal reconstruction. The theoretical derivation and experimental simulations show that this algorithm has obvious benifits in terms of operation speed and reconstruction accuracy while maintaining the advantages of this original algorithm.
keywords: wireless communication technology radar communication Intergration compressed sensing(CS) spatial sparse Partitioning optimized reconstruction algorithm
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基于稀疏空域融合的DOA估计算法研究
摘要:智能汽车雷达通信一体化系统中利用压缩感知理论估计阵列信号到达角的核心问题是空域稀疏的划分和稀疏重构算法的优化。不同的划分方式会导致阵列流型的不同,而阵列流型的构建又是算法估计的基础。目前对稀疏化模型的建立都只简单地采用空域等角度或者等正弦稀疏化方式,然而在法线和端射方向上,两者的正交性不相同,估计结果也就不一样。为此,论文设计了一种等弦和等角稀疏融合的划分模型。仿真表明该模型相比传统划分方式,确实具有一定的优越性。此外,为了优化一体化系统中SAMP算法性能,论文提出了一种改进的匹配追踪算法。该算法在SAMP算法的基础上,设置严格的残差值比对为终止条件,通过自适应过程自动调节候选集原子个数,以实现准确的信号重建。通过理论推导和实验仿真表明了该算法在保持原算法优势的基础上,运算速度和重构精度也均有明显的优势。
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基于稀疏空域融合的DOA估计算法研究
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