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27 results on '"Nicholson, L. W."'

12. ATS-6 spacecraft: In-flight antenna pattern measurement

Author

Nicholson, L. W, Hanft, H, Bemis, B. G, and Baldridge, R. L

Subjects
Communications And Radar
Abstract

Antenna patterns, principally associated with the 9.1 meter parabolic antenna of the ATS-6 spacecraft, were measured while in orbit at quasi-stationary synchronous altitude. Controlling the spacecraft attitude permitted a scanning of the spacecraft antenna pattern over the Rosman ground station, thus achieving the measurement of the antenna pattern contour. Patterns were determined in terms of relative gain referenced in position to the spacecraft body coordinates by means of signal power measurements made using a linear detector. These data were subsequently correlated with the attitude data to define the antenna patterns. Antenna patterns measured are presented and compared with available preflight patterns.

Published
1976

13. A SURVEY OF THE BREEDING SEABIRDS AND MIGRATORY SHOREBIRDS OF THE HOUTMAN ABROLHOS, WESTERN AUSTRALIA.

Author

Surman, C. A. and Nicholson, L. W.

Abstract

The article presents the results of a brief survey regarding the breeding seabirds and migratory waders at the Houtman Abrolhos, Western Australia. It states that the survey compares population sizes of the major seabird colonies to the studies conducted in the 1990s where the long-term changes in the location of breeding colonies are identified. The survey also involves the study of 192 islands, islets and rock over 21 days in December 2006 in which the seabird nesting habitat was mapped. The survey recorded 14 species of seabirds, three resident shorebirds, and two raptors which were breeding. Results show a decrease in the population sized of some species such as Wedge-tailed Shearwater and increase in other species such as Puffinus assimilis.

Published
2009

14. Gun Island, Pelsaert Group, Houtman Abrolhos, Western Australia.

Author

Surman, C. A. and Nicholson, L. W.

Abstract

The article offers information on the population, breeding and status, and ornithological history of seabirds including Little Shearwater, Pelagodroma marina, and Wedge-tailed Shearwater at Gun Island in Western Australia.

Published
2015

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