REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

DIRECTION FINDER WITH SWITCHED ANTENNA ELEMENTS IN COMBINATION WITH ROOT-MUSIC ALGORITHM FOR DOA ESTIMATION

ivan p. pokrajac

Military Technical Institute, Belgrade, ivan.pokrajac@vs.rs

Predrag okiljevic

Military Technical Institute, Belgrade, predrag.okiljevic@vti.vs.rs

desimir vucic

UNION University, School of Computing, dvucic@raf.edu.rs

Abstract: In modern direction finder radio-frequency (RF) signal acquisition can be performed by parallel or sequential method. In this paper we consider development of a direction finder in the case of sequential signal acquisition. The parallel signal acquisition is performed simultaneously from all L antenna elements. Sequential signal acquisition means that the number of RF channels M is lower than the number of antenna elements L in the antenna array. The total acquisition interval is divided into subintervals, and at each subinterval a multiplexer selects a different subset of M elements to connect to the RF signal acquisition channels. Since the direction-finder based on sequential signal acquisition only collects data on M channels simultaneously, hardware costs can be reduced at the expense of a time-accuracy trade-off compared to a system based on parallel signal acquisition. In this paper we use well known high resolution algorithm for direction of arrival estimation Root-MUSIC. Some simulation results are presented in this work.

Key words: Direction of Arrival, root-MUSIC, switched antenna elements.