生锈
发表于 2025-3-25 05:28:42
. Vinken and George W. Bruyn). However, the information selected for inclusion in this volume of the Oklahoma Notes series remains true to the goal of the whole series-only materials vital in both the general clinical practice of medicine and to answer questions on the all-important United States Me
裹住
发表于 2025-3-25 08:54:00
Orbital Mechanics,centrated at the centre. For non-spherical bodies the effects of an irregular shape diminish with distance and can be ignored in most but not all cases, eg. the orbit of a low altitude satellite is perturbed by the oblate shape of the Earth.
DOTE
发表于 2025-3-25 12:17:17
Low Thrust Missions,ower of the Sun with distance, SEP is not useful beyond about 5 AU from the Sun. Nuclear energy generation is of course independent of the Sun but has unfortunately become less attractive in recent years due to an influential Earth-bound environmental lobby.
截断
发表于 2025-3-25 17:22:08
Earth Satellites: Perturbations and Manoeuvres,ly low altitudes (below 100 km). This chapter includes an analysis of perturbations and the necessary corrective manoeuvres but geostationary orbits are treated separately because of their singular nature and tight tolerances.
yohimbine
发表于 2025-3-25 23:21:16
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使迷醉
发表于 2025-3-26 01:08:14
1430-9491 iques - an area not dealt with comprehensively in previous lThe analysis and computational techniques associated with the navigation and guidance of spacecraft are now in a mature state of development. However the documentation has remained dispersed throughout conference papers, journals, company a
负担
发表于 2025-3-26 04:28:52
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著名
发表于 2025-3-26 11:12:54
The Launch Phase,d in the USA. The German work culminated in the V2 rocket of World War 2, a single-stage rocket bomb (ballistic missile). Multi-stage rockets are however required to put any significant payload into at least a low-Earth orbit. In the early stages of space programmes (1957 onwards) all launch vehicle
血统
发表于 2025-3-26 15:07:23
Earth Satellites: Perturbations and Manoeuvres,demanded by the mission, eg. in order to rendezvous with another vehicle. Correction of orbits becomes necessary as a result of perturbations from the non-spherical shape of the Earth, the influence of the Sun, the Moon and any residual atmosphere, although the latter is significant only at relative
arthrodesis
发表于 2025-3-26 17:33:51
Orbit Determination,he Sun, the Earth or a planetary body, ie. navigation is a prerequisite for guidance. Since spacecraft are usually moving in a gravitational field due predominantly to one body such as the Earth or the Sun, the estimation of position and velocity is equivalent to the determination of the orbital par