The experience gained since 1962 in the photoelectric measurement of space vehicle brightness is outlined and the methods used to collect signature data on vehicles of brightness + 11 stellar magnitudes (1/50 sq. m diffuse scatterer at 1000 km) or greater are described. Examples of light curves are given, and a model of a tumbling, diffusely scattering cylinder is developed and compared with a USSR rocket body. A model of a specularly scattering sphere is compared with data collected from three USSR vehicles whose orbital lifetimes indicated their being of deorbiting character. It is shown that these techniques offer a relatively low-cost method of collecting optical signature data at ranges much exceeding those at which resolved images could be obtained. The bistatic and CW character of the technique is demonstrated, which, combined with its inherent inverse-square law limitation on slant range, suggests it as a valuable supplement to conventional radar techniques and long focus imaging. A comprehensive historical account of prior work in satellite photometry is appended. (Author)
Photoelectric Photometry - a Potential Source for Satellite Signatures
1966
2 pages
Report
Keine Angabe
Englisch
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