Moving platform based coprime linear arrays (CLAs) have been studied in recent years. It is shown that by shifting a CLA a half wavelength, the resulting difference coarray can be regarded as the union of the difference coarray of the original CLA and its two shifted versions with one lag to the left and one lag to the right, respectively, filling the majority or all holes in the difference coarray. However, only the lags which are neighbors of holes are actually useful, while the shifts of the other lags generate lags which already exist, contributing then negligibly to the increase of the degrees of freedom (DOFs). In this letter, an improved CLA configuration for moving platform is proposed. By judiciously designing the sensor positions, all lags can be utilized to fill holes, consequently a difference coarray with more consecutive lags can be obtained. Compared with the original configuration, the proposed configuration can detect more sources with the same number of sensors and same length of array motion.

中文翻译：

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DOA估计中用于移动平台的改进的互质线性阵列配置

近年来，已经研究了基于移动平台的互质线性阵列（CLA）。结果表明，通过将CLA偏移半个波长，可以将所得的差分协阵列视为原始CLA及其两个偏移版本的差分协阵列的并集，分别向左滞后和向右滞后一个，填补差异共数组中的大部分或全部空白。但是，只有与孔相邻的滞后实际上是有用的，而其他滞后的变化会生成已经存在的滞后，因此对自由度（DOF）的增加的贡献可忽略不计。在这封信中，提出了一种用于移动平台的改进的CLA配置。通过明智地设计传感器位置，可以利用所有滞后来填充孔，因此，可以获得具有更多连续滞后的差异协阵列。与原始配置相比，提出的配置可以在相同数量的传感器和相同长度的阵列运动的情况下检测更多的源。