基于L型级联互素阵列的多目标源载频和到达角联合估计

随着通信频段的不断拓展,受到Nyquist意义下的阵列间隔和采样频率的限制,多带信号载频和到达角的联合估计难度急剧增大。为突破该瓶颈,设计了一种基于L型级联互素阵列的空时欠采样接收结构,并结合伪噪声空间重构、信源相关性配对,提出了一种全解析的载频和到达角的配对和无模糊联合估计方法。得益于稀疏阵列和时域欠采样,所提结构有效增大了阵列孔径并降低了采样成本。仿真实验证明了所提载频和到达角联合估计方法在较低快拍数和信噪比的条件下,可取得较高的估计精度。

Joint carrier frequency and DOA estimation for multiple target sourcesusing L-shaped unfolded co-prime array

As the communication frequency band gradually expands, it becomes greatly difficult to design a joint carrier and direction of arrival estimator under the Nyquist-sense array inter-element spacing and sampling rate. To overcome this problem, a spatial-temporal sub-sampling architecture characterized with an L-shaped unfolded co-prime array is proposed. Further, an analytical estimator is developed via combining pseudo noise subspace construction and correlation based source pairing. Owning to sparse arrays and temporal sub-sampling, the proposed scheme not only enlarges the array aperture but also lowers the sampling cost. Numerical results demonstrate that the proposed estimator can achieve high accuracy only consuming a small number of snapshots and moderate signal to noise ratio conditions.