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arxiv: 2309.08780 · v2 · submitted 2023-09-15 · 💻 cs.RO

STERN: Simultaneous Trajectory Estimation and Relative Navigation for Autonomous Underwater Proximity Operations

Pith reviewed 2026-05-24 06:34 UTC · model grok-4.3

classification 💻 cs.RO
keywords factor graphsunderwater proximity operationsrelative navigationtrajectory estimationautonomous underwater vehiclesacoustic homingmothership tracking
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The pith

Factor graphs model simultaneous trajectory estimation and relative navigation for any underwater proximity operation.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes that factor graphs offer a single, flexible representation for the simultaneous trajectory estimation and relative navigation problem that arises in underwater proximity operations between a chaser vehicle and a target. This holds across different sensor types and vehicle motion constraints. A reader would care because underwater docking and similar tasks are limited by vehicle endurance, and a unified modeling approach could simplify estimator design for varied scenarios. The authors demonstrate the claim by recasting multiple published underwater proximity cases into the same graph structure and by implementing and testing an estimator on both simulated and real acoustic homing data to a moving mothership.

Core claim

Factor graphs serve as a generalized representation to model the underlying simultaneous trajectory estimation and relative navigation problem that arises with any proximity-operations scenario, regardless of the sensor suite or the agents' dynamic constraints.

What carries the argument

Factor graphs used as the modeling foundation that encodes measurements, motion models, and relative states into a single optimization problem for joint trajectory and navigation estimation.

If this is right

  • Any published proximity-operation scenario can be expressed with the identical factor-graph structure.
  • Estimator design and implementation for new underwater proximity tasks reduces to adding or removing factors without changing the overall solver.
  • Timing measurements confirm that the front- and back-end processes can run at rates suitable for real-time onboard deployment.
  • Limitations of the moving-target motion model can be quantified directly from the same graph by examining residual growth under real data.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same graph construction could be reused for surface or aerial proximity tasks if the measurement factors are swapped accordingly.
  • Standardized factor libraries would let teams swap sensor suites while keeping the navigation solution architecture unchanged.
  • Extending the graph to include explicit docking-phase constraints would allow a single estimator to handle the full sequence from long-range homing to final contact.

Load-bearing premise

The dynamic assumptions made for the moving target are sufficiently accurate and flexible for the long-distance acoustic homing scenario.

What would settle it

A field trial in which the mothership executes maneuvers outside the modeled dynamics and the resulting estimator produces relative-position errors that exceed the accuracy needed for docking.

Figures

Figures reproduced from arXiv: 2309.08780 by Aldo Ter\'an Espinoza, Antonio Ter\'an Espinoza, Clemens Deutsch, Jakob Kuttenkeuler, John Folkesson, Niklas Rolleberg, Peter Sigray.

Figure 1
Figure 1. Figure 1: Definition of the prox-ops phases established to generalize any [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Factor graph representation of a general proximity operation scenario. As the chaser navigates through the different phases of the prox-ops scenario [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Side-by-side representation of the prox-ops scenario addressed in the present work. Left: pictorial description of the chasing AUV homing into the [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Reference frames involved in the USBL measurement procedure. [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Pictorial description of the dynamic USBL measurement scenario. [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Block diagram showing the high-level module description and [PITH_FULL_IMAGE:figures/full_fig_p008_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: RANSAC-based outlier rejection example. New USBL measurements [PITH_FULL_IMAGE:figures/full_fig_p009_7.png] view at source ↗
Figure 9
Figure 9. Figure 9: Resulting 2D trajectories, depths, and absolute errors of the simulated [PITH_FULL_IMAGE:figures/full_fig_p011_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Images of the setup used for experimental verification: a) shows the side-deployment pole with the AHRS and differential GPS at mounted on top, [PITH_FULL_IMAGE:figures/full_fig_p012_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Exploded view of the labeled paths executed by the target (red) and [PITH_FULL_IMAGE:figures/full_fig_p013_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: Plots showcasing the results obtained after processing the Test 1 dataset. The figure shows the global trajectories (true, real-time estimated, smoothed, [PITH_FULL_IMAGE:figures/full_fig_p014_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: Plots for the absolute position, velocity [PITH_FULL_IMAGE:figures/full_fig_p015_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: Error bars representing the mean (black circle) and standard deviation [PITH_FULL_IMAGE:figures/full_fig_p015_14.png] view at source ↗
read the original abstract

Due to the challenges regarding the limits of their endurance and autonomous capabilities, underwater docking for autonomous underwater vehicles (AUVs) has become a topic of interest for many academic and commercial applications. Herein, we take on the problem of relative navigation for the generalized version of the docking operation, which we address as proximity operations. Proximity operations typically involve only two actors, a chaser and a target. We leverage the similarities to proximity operations (prox-ops) from spacecraft robotic missions to frame the diverse docking scenarios with a set of phases the chaser undergoes on the way to its target. We emphasize the versatility on the use of factor graphs as a generalized representation to model the underlying simultaneous trajectory estimation and relative navigation (STERN) problem that arises with any prox-ops scenario, regardless of the sensor suite or the agents' dynamic constraints. To emphasize the flexibility of factor graphs as the modeling foundation for arbitrary underwater prox-ops, we compile a list of state-of-the-art research in the field and represent the different scenario using the same factor graph representation. We detail the procedure required to model, design, and implement factor graph-based estimators by addressing a long-distance acoustic homing scenario of an AUV to a moving mothership using datasets from simulated and real-world deployments; an analysis of these results is provided to shed light on the flexibility and limitations of the dynamic assumptions of the moving target. A description of our front- and back-end is also presented together with a timing breakdown of all processes to show its potential deployment on a real-time system.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 1 minor

Summary. The paper introduces STERN, a factor graph-based approach for simultaneous trajectory estimation and relative navigation in underwater proximity operations between an AUV (chaser) and a target (mothership). It frames docking as prox-ops phases, emphasizes the versatility of factor graphs for any scenario regardless of sensors or dynamics, maps SOTA research to the same FG structure, and details implementation for long-distance acoustic homing using simulated and real datasets, with analysis of dynamic assumption limitations and timing for real-time potential.

Significance. If the generality claim holds, this provides a unified, modular framework for underwater AUV prox-ops that could facilitate adaptation across different scenarios and sensor suites. The use of both simulated and real-world data, along with the compilation of multiple SOTA scenarios into one representation, strengthens the case for factor graphs as a flexible modeling tool in this domain.

major comments (1)
  1. [Abstract] Abstract: the central claim that factor graphs model the STERN problem 'regardless of the sensor suite or the agents' dynamic constraints' is load-bearing for the contribution but rests on the premise that the dynamic factors chosen for the mothership in the acoustic homing implementation remain adequate across qualitatively different target dynamics; the limitation analysis must explicitly demonstrate (via additional mappings or tests) that no new factor types are required to instantiate the same template for alternative motion models.
minor comments (1)
  1. [Abstract] Abstract: results from simulated and real datasets are mentioned but no error metrics, quantitative comparisons, or dataset details are provided; these should be summarized to allow assessment of the generality claim.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive review and for recognizing the potential of the factor-graph framework. We address the single major comment below.

read point-by-point responses
  1. Referee: [Abstract] Abstract: the central claim that factor graphs model the STERN problem 'regardless of the sensor suite or the agents' dynamic constraints' is load-bearing for the contribution but rests on the premise that the dynamic factors chosen for the mothership in the acoustic homing implementation remain adequate across qualitatively different target dynamics; the limitation analysis must explicitly demonstrate (via additional mappings or tests) that no new factor types are required to instantiate the same template for alternative motion models.

    Authors: We thank the referee for isolating this load-bearing claim. The manuscript already maps multiple SOTA scenarios that employ qualitatively different target dynamics (stationary docking stations, constant-velocity motherships, and maneuvering targets) onto the identical factor-graph template using only standard factor types (priors, relative-pose, odometry, and range-bearing factors). These mappings demonstrate that the template itself does not change; only the choice of dynamic factor within the template is adapted to the motion model. The existing limitation analysis discusses the adequacy of the constant-velocity assumption for the acoustic-homing case but does not repeat the cross-scenario mappings. We will therefore revise the limitation-analysis section to explicitly restate the SOTA mappings and add one or two additional illustrative instantiations (e.g., a highly maneuverable target modeled with an acceleration factor) to confirm that no new factor types are introduced. This revision will be included in the next version. revision: yes

Circularity Check

0 steps flagged

No significant circularity; factor-graph modeling is an independent representational choice

full rationale

The paper presents factor graphs as a modeling framework applied to the STERN problem for arbitrary prox-ops scenarios. It compiles existing SOTA work into the same representation and demonstrates one acoustic-homing implementation while noting limitations of the mothership motion priors. No load-bearing step reduces by the paper's own equations or self-citation to a fitted parameter or definition that is equivalent to the claimed result; the generality assertion is an application of a standard tool rather than a self-referential derivation. The central modeling choice remains independent of the specific dynamic assumptions used in the example.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Review performed on abstract only; no explicit free parameters, axioms, or invented entities are stated in the provided text. The central modeling decision is the choice of factor graphs as the representation.

axioms (1)
  • domain assumption Dynamic assumptions for the moving target hold with acceptable flexibility for the acoustic homing scenario.
    Abstract states that results analysis will illuminate limitations of these assumptions, implying they are load-bearing for the reported evaluation.

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