Sparse double parallel linear array and two-dimensional DOA (Direction of Arrival) estimation method

Abstract

The invention discloses a spare double parallel linear array and a two-dimensional DOA (Direction of Arrival) estimation method. The linear array comprises two SULAs with the difference between array element numbers to be one; the sub array with the larger array element number also comprises an auxiliary array element with the distance with the original point to be smaller than or equal to 0.5 lambda; the gap between the SULA array elements is lambda; and the gap between the sub arrays is 0.5 lambda. The corresponding DOA estimation method comprises steps: a linear transformation matrix is obtained based on an autocorrelation matrix for received data, and based on unit arrays with the same dimensions and the same signal number, a propagation matrix Pc is constructed; through carrying out vertical partitioning and corresponding matrix transformation on the Pc, the cosines of included angles between incident signals and the y axis are solved; based on a total array flow matrix corresponding to the two SULAs, two groups of cosines of included angles between incident signals and the x axis are solved; deblurring is carried out based on the received data of the auxiliary array element; and by using the cosines of the included angles between the incident signals and the x axis and the y axis, estimation values of an elevation angle and an azimuth angle are solved. The spare double parallel linear array and the two-dimensional DOA direction estimation method are used for wireless communication, the structure is simple, the cost is low, and the direction-finding precision is high.

Description

technical field [0001] The invention belongs to the technical field of wireless mobile communication, in particular to a parallel linear array based on a sparse uniform linear array and a two-dimensional direction of arrival (DOA) estimation method thereof. Background technique [0002] With the development of space-division multiple access technology and smart antenna technology, using the direction of arrival (DOA) of the signal to complete the airspace acquisition and tracking of the signal has attracted a large number of domestic and foreign scholars' research. In the past two decades, the problem of two-dimensional (2D) direction of arrival (DOA) estimation based on passive array received signals has attracted more and more attention, especially its applications in military radar, sonar, navigation, communication and other fields. [0003] Most of the existing two-dimensional DOA estimation methods are based on simplified planar arrays whose element spacing is equal to ...

AI Technical Summary

Problems solved by technology

[0006] (3) Using two linear sub-arrays with the same number of array elements, the two-dimensional spectral peak search problem is simplified to two one-dimensional processing problems. Although its computational complexity is lower than that of the traditional two-dimensional spectral peak search, it is still There is one spectral peak search, so the calculation amount is higher than that of scheme (1). In addition, the estimation accuracy of this scheme is limited. Specific reference 3: ieqi Xia, Yi Zheng, Qun Wan, and Xuegang Wang, "Decoupled Estimation of 2-D Angles of Arrival Using Two Parallel Uniform Linear Arrays.” IEEE TRANSACTIONS ON ANTENNAS ANDPROPAGATION, VOL.55, NO.9, SEPTEMBER 2007

Images