Ambiguity resolution in amplitude comparison-based monopulse direction finding antenna systems

Ahmad, N., Nawaz, H., Shoaib, N., Abbasi, Q. H. and Nikolaou, S. (2023) Ambiguity resolution in amplitude comparison-based monopulse direction finding antenna systems. IEEE Antennas and Wireless Propagation Letters, 22(10), pp. 2605-2609. (doi: 10.1109/LAWP.2023.3298664)

Abstract

In this letter, the use of orthogonal switched-beams at θ = ±20 o is proposed to improve the robustness against angle-of-arrival (AoA) ambiguities in amplitude comparison monopulse systems compared to the conventional use of only sum (Σ) and difference (Δ) patterns. As monotonic behavior of monopulse function inside the given field-of-view causes angular ambiguity so such false detection can be mitigated while analyzing the echo signal through additional switched beams. Theoretical and experimental results using a corporate-fed 1×2 patch array antenna integrated with 3 dB / 180 o and 3 dB / 90 o hybrid couplers, which synthesizes a sum, difference patterns and two orthogonal switched beams (θ = ±20 o ) at 3 GHz, endorse this improvement. The proposed antenna system can also find applications in sequential lobing based direction finding systems.

• Item Type: Articles
• Additional Information: This research was co-funded by the European Regional Development Fund and the Republic of Cyprus via the Research and Innovation Foundation through the EXCELLENCE/ 0421/0495 – SMURFS project.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Abbasi, Professor Qammer
• Authors: Ahmad, N., Nawaz, H., Shoaib, N., Abbasi, Q. H., and Nikolaou, S.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: IEEE Antennas and Wireless Propagation Letters
• Publisher: Institute of Electrical and Electronics Engineers
• ISSN: 1536-1225
• ISSN (Online): 1548-5757
• Published Online: 25 July 2023
• Copyright Holders: Copyright © 2023 IEEE
• First Published: First published in IEEE Antennas and Wireless Propagation Letters 22(10): 2605-2609
• Publisher Policy: Reproduced in accordance with the publisher copyright policy