Radiation hazard evaluation for a high power mobile electromagnetic radiation weapon using the numerical electromagnetic code
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Authors
Koh, W. J.
Subjects
radiation hazard
planar array
computer modeling
planar array
computer modeling
Advisors
Adler, R.W.
Date of Issue
1987-03
Date
March 1987
Publisher
Monterey, California: U.S. Naval Postgraduate School
Language
en_US
Abstract
It is well known that classical ECM techniques against an incoming active missile
attack is effective only at distances where the jamming signal to missile return signal
ratio is high. There is no guarantee that it will work well against all missiles. As the
missiles get closer to the target, the effectiveness of classical ECM techniques is
reduced. Hence, there is a need to design a short range ECM system that is effective at
medium range and increases its countermeasure capabilities as the range shrinks. The
US Army is considering a high power, mobile ECM system capable of delivering up to
5 GW of peak power at 10 GHz. The narrow beamwidth of this system creates a very
high peak power density of the order of 10-20 W/cm² at 10 Km distance. With this
amount of concentrated energy, it is capable of damaging or degrading the highly
sensitive sensors of the missile and causing the missile to lose track of its target.
The purpose of this project is first, to evaluate the various possible array types
which must meet a far field peak power density requirement subject to a constraint on
maximum aperture E-field strength. At the same time, the sidelobe and backlobe levels
should not cause radiation hazard to the operators of the system. After an array
design is chosen, the whole vehicular structure is modeled and near field patterns are
examined to determine the likely radiation hazard zone.
This project is based on the usage of the Numerical Electromagnetic Code - Basic
Scattering Code (NEC-BSC) from the Ohio State University. Four additional software
programs are written to support the code. The evaluation shows that Uniform -
Cosine tapering offered the lowest sidelobe and backlobe level in the near field and yet
met the far field requirement and maximum aperture E-field constraint. With the
vehicular structure included, the system has a safety margin of more than 27 dB below
the recommended radiation hazard limit near ground level.
Type
Thesis
Description
Series/Report No
Department
Electrical and Computer Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
NPS 62-87-008
Sponsors
Harry Diamond Laboratories MIPR R85-103
Funding
Harry Diamond Laboratories MIPR R85-103
Format
160 p.: ill. 28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner