Angle estimation of unresolved targets in monopulse radar via creating multiple antenna sets using an extra antenna

Document Type : Original Article

Authors

1 Department of Electrical Engineering, K.N. Toosi University of Technology

2 Department of Electrical Khatam Al-Anbia Air Defense University Tehran, Iran

3 Faculty of electrical and erelectronic, warfare imam Houssein comprehensive university

4 Emam Hosein Universisty

Abstract

Conventional monopulse radar cannot detect the direction of two closely-spaced targets in one resolution cell by utilizing the monopulse ratio. In this study, virtual amplitude-comparison monopulse signals are generated from the received phase-comparison monopulse signals, then a solution for estimation of the angles of two unresolved targets using a single snapshot of four independent channels is presented. If both targets have the same azimuth or elevation angle, the proposed scheme cannot detect their angles; an additional antenna is required, to detect such targets' angles. In this study, the antenna array is divided into multiple overlapping sets, to detect the direction of two targets at generalized positions in two different coordinates. Combining the outputs from multiple antenna sets improves the angle estimation performance and accuracy. The impact of SNR, the angle difference between the targets, and the phase difference of target signals on the accuracy of angle estimation have also been explained. The effectiveness of the proposed method is validated by comparing the exact solutions and simulations.

Keywords

Radar
Volume 10, Issue 2 - Serial Number 28
Number 28, Autumn and Winter Quarterly
January 2023

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History

  • Receive Date: 25 January 2023
  • Revise Date: 09 August 2024
  • Accept Date: 06 August 2023
  • Publish Date: 22 December 2022

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