Anti-Degeneracy Scheme for Lidar SLAM based on Particle Filter in Geometry Feature-Less Environments
Journal:
arXiv
Published Date:
Feb 17, 2025
Abstract
Simultaneous localization and mapping (SLAM) based on particle filtering has
been extensively employed in indoor scenarios due to its high efficiency.
However, in geometry feature-less scenes, the accuracy is severely reduced due
to lack of constraints. In this article, we propose an anti-degeneracy system
based on deep learning. Firstly, we design a scale-invariant linear mapping to
convert coordinates in continuous space into discrete indexes, in which a data
augmentation method based on Gaussian model is proposed to ensure the model
performance by effectively mitigating the impact of changes in the number of
particles on the feature distribution. Secondly, we develop a degeneracy
detection model using residual neural networks (ResNet) and transformer which
is able to identify degeneracy by scrutinizing the distribution of the particle
population. Thirdly, an adaptive anti-degeneracy strategy is designed, which
first performs fusion and perturbation on the resample process to provide rich
and accurate initial values for the pose optimization, and use a hierarchical
pose optimization combining coarse and fine matching, which is able to
adaptively adjust the optimization frequency and the sensor trustworthiness
according to the degree of degeneracy, in order to enhance the ability of
searching the global optimal pose. Finally, we demonstrate the optimality of
the model, as well as the improvement of the image matrix method and GPU on the
computation time through ablation experiments, and verify the performance of
the anti-degeneracy system in different scenarios through simulation
experiments and real experiments. This work has been submitted to IEEE for
publication. Copyright may be transferred without notice, after which this
version may no longer be available.
