Radiation hazard evaluation for a high power mobile electromagnetic radiation weapon using the numerical electromagnetic code
Koh, W. J.
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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.
Approved for public release; distribution is unlimited
NPS Report NumberNPS 62-87-008
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