A Low-Complexity Setup for DOA Estimation of Coherent Signals of Unknown Sources Located at Endfire Angles

Document Type : Original Article

Authors

Abstract

Estimating direction of arrival (DOA) is more complicated when unknown non-coherent sources
contain coherent signals or when sources are coherent. Recently, a new method based on
uniform linear array (ULA) has been proposed that first determines the number of non-coherent
sources and then estimates the DOA of coherent signals in each group. ULA is more applicable
for DOA estimation but for estimating DOAs close to the array endfire, this configuration does
not perform well or signals may be missed. Cross array (CA) is a suggestion to solve this
problem but it offers a lower performance for middle angles and introduces more computational
complexity. As the main goal of this investigation, using the proposed threshold-based JADEMUSIC algorithm, a new method is proposed which divides angles in two parts. For the angles which are in the range of [−60°, 60°], horizontal elements of CA and for endfire angles and the angles which are in the range of [−90°, −60°] and [60°, 90°], vertical elements of CA are considered. Simulation results demonstrate that the new proposed scenario offers a higher
performance for DOA estimation of narrowband signals with respect to ULA and CA
configurations. Also, its computational load is the same as the case that uses ULA. 

Keywords

References

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History

  • Receive Date: 07 June 2015
  • Revise Date: 22 January 2024
  • Accept Date: 19 September 2018
  • Publish Date: 20 April 2016

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