Theoretical Radiation Patterns of NAVSPASUR Transmitter Antennas
Abstract
Interferometrics Inc. has recently participated in an effort to determine the capabilities of the current Naval Space Surveillance System (NAVSPASUR), and to examine the impact of proposed systems enhancements. As part of this effort, Interferometrics Inc. has identified the need for an accurate analytic model of the NAVSPASUR system which can be used to simulate data. One of the critical components of such a model is a realistic transmitter antenna radiation (or beam) pattern. The transmitter beam pattern calculations previously available have been based on oversimplified models of the dipole element radiation pattern. We provide here a detailed calculation of the radiation pattern of the NAVSPASUR transmitter element above its finite wire- grid ground screen. Using this calculation, we also derive near-field and far- field beam patterns for the NAVSPASUR transmitter antennas for a number of interesting cases. A detailed description of the transmitter antennas is given in Section II and an overview of the terminology used in this paper is contained in Section III. In Section IV we calculate the beam patterns for a single NAVSPASUR radiating element in free space, over an infinite ground screen, and over a finite ground screen. The finite ground-screen results are used in Section V to calculate the antenna array radiation patterns using the principle of superposition. We present in Section VI our conclusions, together with a discussion of the potential applications of the model we have developed. An overview of the computer codes developed for these and other related calculations is given in the Appendix to this report.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1988
- Accession Number
- ADA204410
Entities
People
- Steven L. Berg