Angle Measurement Method for Two Targets within an Antenna Beamwidth Using Two Receivers

Kentaro ISODA  Teruyuki HARA  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.11   pp.2969-2977
Publication Date: 2011/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2969
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Space, Aeronautical and Navigational Technologies in Conjunction with Main Topics of WSANE and ICSANE)
monopulse,  multiple targets,  angle measurement,  angle resolution,  angle of arrival,  

Full Text: PDF>>
Buy this Article

A monopulse angle measurement method is often utilized to measure a target angle. However, this method cannot measure correct angles for multiple targets which cannot be distinguished by range, Doppler frequency and beamwidth. When the number of targets which cannot be distinguished by these parameters is restricted to two, a method which can measure two targets angles has been proposed. However, an approximation is utilized with this method, so that measured angles have errors even though the signal-to-noise ratio is infinite. Another method which can simultaneously measure azimuths and elevations for only two targets has also been proposed. However, this conventional method requires four receivers, and is therefore difficult to apply when there is a hard ware limitation. In this paper, we propose a method to measure azimuths and elevations of two targets by using two receivers and a time division system. A pairing problem has occurred due to the time division angle measurement with this method, so we also propose an algorithm to solve this pairing problem. We finally verify the proposed method by a numerical simulation and experimentation. The results show that the angles of two targets can be measured by our proposed method by using two receivers.