Ideally the rotation period of other bodies is measured as the time interval between successive passages of a meridian line on the surface across the center of the disk, as seen from Earth. The solid surface may however be unobservable and indirect measurements, as by radar, are then employed...
9 RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook earth rotation [¦ərth rō¦tā·shən] (astronomy) Motion about the earth's axis that occurs 365.2422 times over a year's period. McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyrig...
Phase rotation system for use in velocity cancellation moving target radar systemsdoi:US3274591 AChambers Torrence HUS
aradar map of multiple objective analysis to assess the various functions of the rotations;bcomprehensive evaluation index (CEI, Eqs.15–24 in Method,supplementary material);csynergy and trade-off relationship among the key variables across the different crop rotations;d, Nightingale Rose Charts of ...
it is important to know the Doppler properties of the return waves.The formula about Doppler frequency is deduced from the relative velocity of the radar and the scatting point.As a result,the Doppler frequency from the earth ro...
Vortex Signature Recognition by a Doppler Radar A vortex in solid rotation has a characteristically uniform signature on a Doppler velocity display which may, however, be smoothed down according to the resolution limitations of the antenna beam. Sharp velocity peaks are rounded down to... RJJ Donal...
例句 释义: 全部,旋转法 更多例句筛选 1. Measuring method of rotation velocity for small arms projectiles by Doppler radar 多普勒雷达测量轻武器弹丸转速方法研究 www.ilib.cn 2. The Measuring Method of Rotation Speed Based on Single-chip Microcomputer 基于单片机的转速测量方法 www.ilib.cn©...
摘要: Refined equations are given for taking into account the effect of the Earth's rotation on the magnitude and location of the observed velocity vector of a meteoric particle.关键词:physics meteoroids orbits earth planet rotation equations of motion solar system ...
(2.18) were chosen so that the velocity curve becomes flat. Our choice is µ = 1 50 1 kpc , (2.24) y=3. (2.25) We thus obtain the square of the rotation velocity as a function of the distance r from the center of galaxy by rg 2π v2(r) = σ0 4π r dr′ dθ′r′e...
At some places on Mercury’s surface, an observer could see the Sun rise about halfway, reverse its course, then set, all over the course of one Mercurial day. This happens about four days prior to perihelion, because Mercury’s angular orbital velocity is equal to its angular rotational ...