Ambiguity Resolution in Amplitude-Comparison-Based Monopulse Direction-Finding Antenna Systems

被引：3
|
作者：
Ahmad, Noman [1 ]
Nawaz, Haq [2 ]
Shoaib, Nosherwan [1 ]
Abbasi, Qammer Hussain [3 ]
Nikolaou, Symeon [4 ,5 ]
机构：
[1] Natl Univ Sci & Technol, Sch Elect Engn & Comp Sci, Islamabad 44000, Pakistan
[2] Univ Engn & Technol, Dept Elect Engn, Lahore 54890, Pakistan
[3] Univ Glasgow, James Watt Sch Engn, Glasgow G12 8QQ, Scotland
[4] Frederick Univ, Frederick Res Ctr, CY-1036 Nicosia, Cyprus
[5] Frederick Univ, Dept Elect Engn Comp Engn & Informat, CY-1036 Nicosia, Cyprus
来源：
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS | 2023年 / 22卷 / 10期
关键词：
Switches; Couplers; Antenna arrays; Directive antennas; Estimation; Radar antennas; Phased arrays; Direction-of-arrival (DoA); monopulse; orthog onal switched beams; sequential-lobing;
D O I：
10.1109/LAWP.2023.3298664
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this letter, the use of orthogonal switched beams at theta = +/- 20(degrees) is proposed to improve the robustness against angle-of-arrival ambiguities in amplitude-comparison monopulse systems compared with the conventional use of only sum (Sigma) and difference (Delta) 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 x 2 patch array antenna integrated with 3 dB/180(degrees) and 3 dB/90(degrees) hybrid couplers, which synthesizes a sum, difference patterns, and two orthogonal switched beams (theta = +/- 20(degrees)) at 3 GHz, endorse this improvement. The proposed antenna system can also find applications in sequential-lobing-based direction-finding systems.
引用
收藏
页码：2605 / 2609
页数：5
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