一种改进的波束域ESPRIT算法

A Modified Beamspace ESPRIT Algorithm

高分辨方位估计技术在声纳、雷达、通信、地质探测等众多应用领域中占有十分重要的地位。ESPRIT算法作为一种成熟的高分辨算法有运算量小的优点,但其减小了阵列的有效孔径,在现有的高分辨处理设备中,由于空间的限制,阵列不可能随意增大,因此要最大限度的扩大阵列的有效孔径。通过对均匀线列阵下波束域ESPRIT算法(BmESPRIT)的研究,提出了一种基于ESPRIT的新算法,并给出了转换成波束域处理的构造方法。该算法利用后向平移技术,使两子阵列与原阵列具有相同的有效孔径。有效的利用了阵列资源。仿真结果表明在相同条件下该算法的估计性能明显提高。

High - resolution Direction of Arrival （DOA） Estimation plays a very important role in the fields of sonar, radar, and communications. ESPRIT as a mature high - resolution algorithm has the advantage of less computation, but it decreases the effective length of the array. Because of the space restriction, the length of an array cannot be too long at will, so the effective length of the array should be increased to the maximum. A new algorithm based on ESPRIT is proposed by studying the ESPRIT algorithm in uniform line arrays and a conformation way to transform beamspace is presented. For the effective length of the array being decreased when using ESPRIT algorithm, the back - shifting technique is adopted in the proposed algorithm in order to make the two subarrays have the equivalent aperture as the whole array. The simulation result shows that the proposed method has better performance under the same condition.