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Arms and Uniforms: Second World War - download pdf or read online

By L. Funcken, F. Funcken

ISBN-10: 0706363426

ISBN-13: 9780706363425

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4 is an example of an IR surveillance satellite. The payload is an IR telescope that detects and tracks missiles by the heat emitted from their rocket plumes. The detectors in the telescope are cooled to approximately 150 K by a cryogenic radiator with a helium-coolant loop. The entire satellite rotates at 6 rpm to provide a scanning motion that sweeps the linear detector array across Earth's surface. Ground software reconstructs the sweep into an Earth image with all heat sources displayed. DSP provides the United States with its first warning of missile launches.

10. Celestial coordinates. S t a n d a r d Earth O r b i t s 39 Semimajor axis: the semimajor axis of the orbit ellipse. 2) r a + rp a - 2 ' where a is the orbit semimajor axis, r a is the orbit radius at apogee (Earth's radius + apogee altitude), and rp is the orbit radius at perigee (Earth's radius + perigee altitude). Period: The time required to make one revolution about the Earth. As orbit altitude increases, so does the period. The orbit period may be calculated using the relation P = 2n /-~/1/2.

As ~ increases, the satellite passes over areas of Earth further from the subsolar point, thereby reducing albedo loads; however, the satellite is also in the sun for a larger percentage of each orbit as a result of decreasing eclipse times. At some point, which varies depending on the altitude of the orbit, eclipse time drops to 0. With 13equal to 90 deg, a circular orbit appears as a circle as seen from the sun; no eclipses exist, no matter what the altitude; and albedo loads are near 0. Fig.

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Arms and Uniforms: Second World War by L. Funcken, F. Funcken


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