New Researches in Electronic Defense Systems

New Researches in Electronic Defense Systems

Angle Error Analysis in S-Band Monopulse Radars with Cavity Vack Spiral Antenna for Passive Seeker Systems

Document Type : Original Article

Authors
Morteza Mohammadi Shirkolaei 1
Amir Hossein Dehghani 2
1 Assistant Professor of Electrical Engineering Department- Shahid Sattari Aviation University
2 ِDepartment of Electrical Engineering, University of Tehran
10.22034/joeds.2025.545789.1100
Abstract
Due to its high-precision angle measurement performance, monopulse technique plays a key role in fields such as remote sensing and space surveillance. The accuracy of monopulse angle measurement depends on the received amplitude and phase information. This paper studies the design of a monopulse amplitude system for use in an S-band passive seeker system with an angle error of less than 2.2 degrees and an angle scan of -20 degrees to +20 degrees. The proposed design uses four helical cavity antennas with right-handed circular polarization, each with a gain of approximately 2.9 dB and a total gain of 7 dB. Using the characteristics of the arrayed antenna and the monopulse radar relations, the angle error for the signal-to-noise ratio of 20 dB is 2.2 degrees.The proposed design uses four helical cavity antennas with right-handed circular polarization, each with a gain of approximately 2.9 dB and a total gain of 7 dB. Using the characteristics of the arrayed antenna and the monopulse radar relations, the angle error for the signal-to-noise ratio of 20 dB is 2.2 degrees.
Keywords
monopulse
angle error
cavity back spiral antenna
signal to noise ratio