5 results about "Ground track" patented technology

The invention relates to a common ground trajectory giant constellation fly-over orbit optimization method, device and equipment, and relates to the technical field of spaceflight. The method comprises the steps of obtaining task initial parameters; establishing an orbit optimization model; traversing different fly-over initial moments of a first target satellite in the whole task to obtain a maneuver-free fly-over nominal orbit and a corresponding target satellite fly-over number; deriving a plurality of maneuver-free flyover orbits for accessing the whole constellation; establishing a multi-pulse transfer optimization model, and solving the optimal speed increment of each transfer type; mapping each maneuver-free flyover track into an access node, constructing a node transfer cost matrix according to the optimal speed increment, and solving an optimal access sequence for accessing all nodes; and integrating the parameters of a plurality of maneuver-free flyover orbits, the optimal access sequence and the maneuver scheme of each transfer type to form a most economical propellant flyover scheme for accessing the whole common ground trajectory giant constellation. According to the method, multiple target satellites can fly over through one-time maneuvering, and efficiency and fuel economy are both considered.

This invention provides a graph-theory-based method and apparatus for determining multi-angle observation opportunities in heterogeneous SAR, comprising: calculating the intersection points of the ground trajectory centerlines of several SAR satellites; establishing an edge on the ground trajectory centerlines connected by any two intersection points based on geometric constraints; for each intersection point, determining the neighboring intersection points based on the edge, obtaining interior angles based on the intersection point and its neighboring intersection points, and determining candidate cooperative points based on the interior angles; generating a local connectivity graph based on the candidate cooperative points, performing a heuristic search on the local connectivity graph according to preset rules to obtain polygonal regions; and verifying and filtering the polygonal regions to obtain cooperative observation areas. This scheme can proactively and completely identify geometrically feasible cooperative observation opportunities from a massive number of trajectory intersection points, providing a systematic solution for the efficient utilization of global on-orbit SAR resources.

The present application relates to a kind of optimization method of remote sensing satellite ground track distribution based on genetic algorithm, belong to the technical field of remote sensing satellite constellation networking design, solve how to meet the problem of the remote sensing requirement of specific area in prior art.Through obtaining the parameter information of remote sensing satellite to establish remote sensing satellite ground track distribution deployment scheme and determine deployment objective function and constraint condition;Based on this, the ground track deployment scheme of remote sensing satellite is solved using fast non-dominated genetic algorithm, and the optimal deployment scheme is obtained.The revisit time interval of distribution target in region is realized to be smaller, the coverage is larger, the image type is more, and the number of satellite needing ground track adjustment is less.

This invention provides a method and apparatus for planning multi-angle observation missions in a heterogeneous SAR constellation, comprising: acquiring the ground trajectory centerlines of each SAR satellite in the heterogeneous SAR constellation during the planning period, and determining the intersection points of the ground trajectory centerlines; filtering the intersection points to obtain candidate cooperative points that satisfy geometric constraints; generating a local connectivity graph based on the candidate cooperative points, and performing a heuristic search on the local connectivity graph according to preset rules to obtain the cooperative observation area; and performing multi-objective optimization of the cooperative observation area based on cooperative constraint requirements and the task to be observed to obtain the target observation area. This scheme achieves efficient utilization of heterogeneous SAR resources, and can actively search for effective multi-angle observation areas given satellite resources, thereby improving planning efficiency and observation quality.