Improved ESPRIT algorithm used in spatial subspace for NULA

A modified T-ESPRIT algorithm estimates direction of arrival (DOAE) for target and increases the estimation accuracy is introduced. This algorithm treats with non uniform linear (NULA) array as a multiple uniform linear arrays with the same reference point, and separated by distance greater than the half wave length. Then, it combines T-ESPRIT with time differential of arrival (TDOA) technique. The estimated results are better than the other ESPRIT methods leading to the estimator performance enhancement.