Interrupted track correlation method of maritime target of high-orbit optical satellite

Abstract

The invention discloses an interrupted track correlation method of a maritime target of a high-orbit optical satellite. The method comprises the steps of: performing backward extrapolation on a previous first track and performing forward extrapolation on a latter second track; performing preliminary correlation on the first track and the second track whose state estimation at the same moment meetsconstraint conditions; performing further correlation on the tracks in a preliminary correlation set to obtain a further correlation set; solving the further correlation set by using a two-dimensional optimal allocation principle to obtain a first stage correlation set with the minimal global cost; solving a possible correlation segment pair of a complementary set of the first stage correlation set in the preliminary correlation set by using distance two-dimensional optimal allocation; detecting and screening an intermediate correlation set by using an amplitude relationship to obtain a second stage correlation set; and fitting correlated tracks in the first stage correlation set and the second stage correlation set to obtain a continuous track. By adopting the interrupted track correlation method of the maritime target of the high-orbit optical satellite disclosed by the invention, the performance of track correlation is improved.

Description

technical field [0001] The invention relates to the technical field of space-based maritime target monitoring, in particular to a high-orbit optical satellite maritime target interruption track correlation method. Background technique [0002] The working modes of high-orbit (the present invention refers to geostationary orbit) optical satellites can be different according to the satellite observation tasks. Taking my country's "Gaofen No. 4" (GF-4) satellite as an example, its working modes are mainly divided into staring imaging , area imaging and mobile inspections. Among them, the staring imaging mode is continuous imaging of the surveillance area, the regional imaging mode is splicing imaging of the surveillance area, and the mobile inspection mode is based on mission requirements, using attitude maneuvers to quickly complete the imaging of multiple areas. Constrained by the resources on the satellite, the daily working hours of the satellite are limited and cannot be t...

AI Technical Summary

Problems solved by technology

The traditional interrupted track correlation method mainly deals with the problem of track interruption caused by target occlusion, target maneuvering, etc., and the track fragment correlation is mainly based on statistical distance, and the correlation effect is poor in complex situations such as long-term intervals and dense distribution of targets.

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