Doa estimation of coprime array

Estimating the direction of arrival (DoA) of signals using a coprime array involves using two or more non-uniformly spaced subarrays to estimate the DoA of a signal. The subarrays are designed such that their element spacing is relatively prime, which allows for unique differences in the phase of the signal received by each subarray.

To estimate the DoA, the signals received by each subarray are first correlated with each other, and the resulting correlation matrix is then used to estimate the signal's DoA. This is typically done using eigendecomposition techniques such as MUSIC or ESPRIT.

One advantage of using a coprime array is that it can achieve a higher resolution than a uniform linear array (ULA) of the same size. However, designing and implementing a coprime array can be more challenging than a ULA due to the non-uniform element spacing.