This work explores the limits of using flash lidar measurements around an asteroid for relative orbit determination by comparing different filtering methods and testing the robustness of these methods to model errors. Previous work showed that flash lidar can provide accurate orbit determination with an onboard shape model and is less computationally expensive than using the state-of-the-art optical navigation methods. Here, the performance of three filters is compared for a circular terminator orbit and an eccentric orbit, both around the asteroid Itokawa. An iterative least-squares filter is presented that counters the filter saturation seen with other Kalman filtering methods. Estimating an off-nominal pointing bias is added to the estimation state, and the bias and pointing jitter are accurately resolved with the iterative least-squares filter. Using a low-fidelity onboard shape model tests the filter robustness and increases computational efficiency, and the filters do not diverge. The majority of the state errors are captured with a sequential consider covariance analysis. The results of these studies add confidence to pursuing the use of flash lidar measurements for autonomous navigation in proximity to small bodies and in complex dynamical environments.
Robust Orbit Determination with Flash Lidar Around Small Bodies
Journal of Guidance, Control, and Dynamics ; 41 , 10 ; 2163-2184
2018-07-16
22 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Orbit Determination Using Flash Lidar Around Small Bodies
Online Contents | 2016
|Orbit Determination Using Flash Lidar Around Small Bodies
Online Contents | 2016
|