Cramer-Rao Bound for DOA Estimation Exploiting Multiple Frequency Pairs

The Cramer-Rao bound (CRB) for direction of arrival (DOA) estimation exploiting both auto-correlation and cross-correlation information within multiple frequencies of the received array signals is derived. It provides a tighter bound than the existing CRB for the dual-frequency scenario. For the multiple frequencies, it is much lower than its dual-frequency counterpart, and also exists for a greater number of sources, thereby validating that exploiting multiple frequency pairs can improve both estimation accuracy and target resolvability.

Automated summary

The Cramer-Rao bound for direction of arrival estimation using multiple frequency pairs provides a tighter bound than the existing dual-frequency scenario, leading to improved estimation accuracy and target resolvability.