4 results about "Gravitational potential" patented technology

This invention discloses a virtual splicing and assembly method for satellite antennas based on the cooperative optimization of gravitational potential energy functions. The method includes: constructing a virtual assembly initialization scenario driven by multi-source data; constructing a global gravitational potential energy field based on theoretical surfaces, converting the geometric surface errors of the sub-lobes into global potential energy values; constructing a local cooperative constraint potential energy field based on boundary topological relationships, which includes an elastic tensile potential energy component characterizing the gap width and a torsional potential energy component characterizing the step difference and normal deflection; treating the sub-lobes to be assembled as rigid bodies, solving for the differential of pose parameters based on the total potential energy function, and obtaining the virtual net external force and virtual net torque acting on the centroid of the sub-lobes; based on the virtual net external force and virtual net torque, synchronously updating the spatial position and attitude angle of all sub-lobes along the opposite direction of the potential energy gradient, and recalculating the global gravitational potential energy function and the local cooperative constraint potential energy function until the total potential energy converges. This invention achieves efficient and accurate virtual splicing and assembly of satellite antennas.

The application relates to a kind of asteroid surface escape velocity calculation method considering rotation and terrain influence, comprising: obtaining the three-dimensional shape model of target asteroid and carrying out discrete, reading the vertex set and triangular facet set of polyhedron, carrying out gravity field modeling, establishing standard polyhedral gravity model;Define the logarithmic kernel function of each edge of each triangular facet, to determine the gravitational potential of target asteroid on any field point;Establish star-fixed coordinate system in standard polyhedral gravity model, determine the rotation speed of any point on the surface of target asteroid, thereby define the effective potential upper bound and the inertial system speed of the release instant of the particle on the surface of target asteroid;Based on the minimum escape condition that the kinetic energy of the particle on the surface of target asteroid is equal to the corresponding effective potential upper bound, determine the minimum normal escape velocity of the particle. Compared with the prior art, the application can quickly obtain accurate minimum escape velocity and corresponding escape direction at any surface point.

This invention belongs to the field of geodesy and geophysical exploration technology, and discloses a method for transoceanic elevation transfer and global elevation datum unification using multi-frequency, multi-mode GNSS. The method includes: Step 1, deploying multi-frequency, multi-mode GNSS receivers at multiple local leveling / gravity measurement points and simultaneously conducting GNSS static observations; Step 2, acquiring satellite precision clock track products; Step 3, calculating the gravitational potential at the satellite's location; Step 4, using a model for determining gravitational potential and altitude based on single-station non-differential multi-frequency, multi-mode GNSS signals to calculate the altitude of ground measurement points; Step 5, iteratively executing steps 1-4 to obtain the altitude of each transoceanic observation point; Step 6, obtaining the elevation difference between two different transoceanic measurement points through difference calculation; Step 7, determining the elevation datum difference between the two different transoceanic locations based on the least squares method, thus achieving the unification of transoceanic elevation datums. This invention overcomes the long-standing problem of transoceanic and transsea elevation transfer and achieves the unification of global elevation datums.