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2 results about "Libration" patented technology
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In astronomy, libration is the wagging of the Moon perceived by Earth-bound observers caused by changes in their perspective. It permits an observer to see slightly different halves of the surface at different times. It is similar in both cause and effect to the changes in the Moon's apparent size due to changes in distance. It is caused by three mechanisms detailed below, two of which are causing a relatively tiny physical libration via tidal forces exerted by the Earth. Such true librations are known as well for other moons with locked rotation.
Transfer orbit design method, device and medium from gto to earth-sun coplanar libration point
ActiveCN115906455BDesign optimisation/simulationConstraint-based CADDynamic equationDifferential correction
Embodiments of the present application disclose a transfer orbit design method from GTO to the Sun-Earth collinear libration point, a device and a medium; the method comprises: calculating and obtaining an invariant manifold connected with the Halo orbit around the libration point according to the spacecraft dynamics equation and the potential function in the Sun-Earth barycenter coordinate system; taking the geosynchronous transfer orbit as the earth parking orbit to construct the constraint variable, taking the Halo orbit as the target orbit to construct the control variable, and correcting the control variable by using the least square differential correction method; based on the set constraint condition and performance index, the optimal HOI point corresponding to the optimal performance transfer orbit is selected from the transfer orbit meeting the constraint condition; according to the optimal HOI point, the relationship between the control variable and the parking orbit constraint variable is analyzed, and the differential correction initial value expression for determining the control variable initial value of the multi-constraint orbit design is constructed; the transfer orbit meeting multiple constraints is obtained by using the multi-stage differential correction method according to the differential correction initial value expression.
Owner:HARBIN INST OF TECH
Improved design method for earth-moon triangular libration point orbits
PendingCN122287076ASignificant progressImprove design efficiencyMulti target trackingComputational physics
This invention discloses an improved method for designing orbits near the Earth-Moon triangular translation point. Based on the quasi-periodicity of orbits near the Earth-Moon triangular translation point applicable to space missions, this method obtains terms with different periodic frequencies through spectral analysis and multi-target tracking. Then, based on the analytical solution of the orbit near the Earth-Moon triangular translation point under an ephemeris model, the corresponding coordinate and frequency coefficients are fitted. Using the semi-analytical solution of the orbit enables rapid orbit design, thus avoiding the performance overhead of numerical iteration, and allows for the design of orbits with specified amplitudes and phases.
Owner:NANJING UNIV