System and method for estimating states of spacecraft in planet-moon environment

摘要

A method estimates a state of a spacecraft in a planet-moon environment by executing iteratively a particle filter. The particle filter comprising integrates individually states of each particle of the particle filter according to a probability-evolution equation using a model of the state of the spacecraft represented as a planar circular restricted three-body problem and determines a prior probability of each particle as a previous posterior probability of a corresponding particle during a previous iteration. A joint probability distribution of the state of the spacecraft is determines using the states of each particle and the prior probabilities of each particle and the states and the prior probabilities of each particle are updated according to the joint probability distribution of the state of the spacecraft and a measurement of the state of the spacecraft to produce posterior probabilities of each particle.

主权项

1. A method for estimating a state of a spacecraft in a planet-moon environment by executing iteratively a particle filter, each iteration of the particle filter comprising:
integrating individually states of each particle of the particle filter according to a probability-evolution equation using a model of the state of the spacecraft represented as a planar circular restricted three-body problem (PCR3BP); determining a prior probability of each particle as a previous posterior probability of a corresponding particle during a previous iteration; determining a joint probability distribution of the state of the spacecraft using the states of each particle and the prior probabilities of each particle; and updating the states and the prior probabilities of each particle according to the joint probability distribution of the state of the spacecraft and a measurement of the state of the spacecraft to produce posterior probabilities of each particle, wherein steps of the method are performed by a processor.