A trajectory prediction method for non-cooperative targets in pf space based on firefly swarm optimization

Abstract

The invention discloses an PF space non-cooperative target track prediction method, and the method comprises the steps: an initial particle swarm{x0<1>, x0<2>,...x0<N>} is constructed according to an initial state value of a system, a weight of an initial particle x0 is set as 1 / N, and i=1, 2...N; a particle swarm {xk<1>, xk<2>,..., xk<N>} in k time can be calculated according to a system state equation, and a normalized weight wk of a particle xk can be calculated; the particle swarm in the k time can be optimized according to a firefly algorithm, the process comprises the steps: in each update process, attraction degree [beta]i, j from each particle xk to other partcles can be calculated, the maximum attraction degree [beta]i, max of the partical xk can be selected from the [beta]i, j; when the [beta]i, max is greater than a first threshold [beta]th, position update and weight calculate can be performed on a particle which is corresponding to the [beta]i, max and has small weight; when preset time m is completed, an optimized particle swarm can be obtained; and a state mean value xk^ of system state parameters in k time can be calculated according to the optimized particle swarm. According to the invention, the firefly algorithm can be adopted to optimize a resampling process of particle filtering, the particles cannot be got rid of, system information contained by a particle with low weight can be reserved, and a particle impoverishment problem can be solved.

Description

technical field

[0001] The invention relates to the technical field of orbit prediction, in particular to a method for orbit prediction of non-cooperative targets in PF space based on firefly swarm optimization. Background technique

[0002] Non-cooperative targets generally refer to a class of space objects that cannot provide effective cooperative information, including faulty satellites, failed satellites, space debris, and enemy spacecraft. Orbit prediction for non-cooperative targets refers to predicting the orbit status of non-cooperative targets in a certain period of time based on the orbit dynamics model on the premise of knowing the status of non-cooperative targets at a certain moment.

[0003] Generally speaking, the orbit prediction technology for non-cooperative targets is based on the relative motion state equation of the analytical solution of the C-W equation, combined with estimation theories such as extended Kalman filter, unscented Kalman filter, and part...

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