Target Direction-of-Arrival Estimation Using Nested Frequency Diverse Array

This paper proposes a receiving nested frequency diverse array (FDA) design scheme. The essence of the proposed technique is to construct a new array structure by systematically nesting two or more uniform linear FDA. Using second-order statistics of the received data, it is capable of providing a significant increasing degrees-of-freedom. The frequency increment across the array results in a scan angle that varies with range and provides resistance to range-dependent interference. The improvement offered by the proposed method as compared to traditional FDA are demonstrated by extensive simulation through analyzing the corresponding beampattern and direction-of-arrival estimation performance.