Simulation Study and Sensitivity Analysis on DOA Estimation Using ESPRIT Algorithm

An array antenna system with innovative signal processing can enhance the resolution of a signal direction of arrival (DOA) estimation. The performance of DOA using an estimation signal parameter via a rotational invariant technique (ESPRIT) is investigated in this paper. The DOA angles are derived from the auto-correlation and cross-correlation matrices. Three matrix estimation methods, (1) temporal averaging, (2) spatial smoothing, (3) temporal averaging and spatial smoothing are used to evaluate the performance. Extensive computer simulations are used to demonstrate the performance of the processing algorithms. The DOA performance as a function of signal to noise ratio (SNR), number of snapshots and effect of spatial smoothing are discussed. The position of array antenna elements may deviate from the ideal location. The imprecise element position will increase the DOA estimation variance. Sensitivity analysis due to non-ideal element position is also discussed in this paper