RBFNN-based angles-only orbit determination method with cooperative dual-satellite

To solve the rapid capture problem of the weak observability of passive orbit determination state during the non-cooperative target's space situational awareness mission, an angles-only orbit determination method with cooperative dual-satellite based on RBFNN is proposed. Firstly, under the restricted three-body problem hypothesis, an orbital dynamics model considering the Earth's non-spherical J2 perturbation and a model for right ascension and declination measurements are established. Subsequently, a framework for dual-satellite cooperative angles-only orbit determination based on RBFNN is formulated, and the training data set generator, the data preprocessing method, and the structure of RBFNN are designed. Finally, the numerical simulations based on geostationary orbit type mission are conducted. Additionally, sensitivity analysis of orbit determination with respect to parameters such as measurement frequency is conducted. The simulation results show that under the condition of only three angle observations in 240 s, the mean-absolute percentage error in initial relative distance estimation of the model is about 0.36%, and the error of target orbit velocity estimation maintains meter/second-level accuracy, which can realize high-precision passive orbit determination of too-short arc. © 2024 Editorial Department of Journal of Chinese Inertial Technology. All rights reserved.