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arxiv: 2605.09494 · v1 · submitted 2026-05-10 · 💻 cs.RO · cs.AI

LASSA Architecture-Based Autonomous Fault-Tolerant Control of Unmanned Underwater Vehicles

Pith reviewed 2026-05-12 04:16 UTC · model grok-4.3

classification 💻 cs.RO cs.AI
keywords LASSA architectureunmanned underwater vehiclesfault-tolerant controllarge language modelsLLM hallucinationsautonomous replanningdual closed-loop controlphysical feasibility solver
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The pith

The LASSA architecture combines an LLM agent for identifying unknown faults and replanning tasks with a solver that enforces physical constraints, allowing unmanned underwater vehicles to achieve autonomous fault-tolerant control without依靠预

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

The paper proposes the LASSA architecture to solve autonomous fault-tolerant control for UUVs in environments where communication limits make predefined rules inadequate for unforeseen faults. An LLM identifies faults through reasoning and generates replans, while the solver verifies that commands meet physical boundary constraints before they reach the actuators. This creates interpretable decision-making and a fast-slow dual closed-loop system in which the slow loop manages high-level replanning and the fast loop maintains real-time control. Lake experiments confirm the approach detects trajectory issues from a lower-rudder fault, adjusts turning radius from 4 m to 12 m and speed from 2 kn to 1 kn, passes all solver checks on first try, and completes the mission without false alarms under normal conditions.

Core claim

The LASSA architecture enables UUVs to perform autonomous fault-tolerant control by letting the LLM reason about unknown faults and task replanning without hard-coded rules, while the solver suppresses physically infeasible hallucinations and the dual closed-loop structure balances intelligent decision-making with high-frequency real-time execution.

What carries the argument

The LASSA (LLM-based Agent with Solver, Sensor and Actuator) architecture, in which the LLM handles fault identification and replanning, the solver checks physical feasibility constraints, and separate fast and slow loops manage real-time control versus high-level decisions.

If this is right

  • UUVs can respond to unforeseen faults through reasoning rather than exhaustive pre-programmed rules.
  • All commands become interpretable and verifiable before actuator execution.
  • The dual-loop design simultaneously supports high-level autonomy and low-level real-time stability.
  • No false fault detections occur during normal operation, as demonstrated in the reported lake runs.
  • Replanning succeeds on the first solver invocation by widening the turning radius to 12 m and lowering speed to 1 kn under rudder fault.

Where Pith is reading between the lines

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

  • The same LLM-plus-solver pattern could apply to other communication-constrained autonomous platforms such as surface vessels or aerial drones facing unexpected failures.
  • Reducing dependence on exhaustive fault libraries might lower the engineering effort needed for new vehicle types or mission profiles.
  • Open-ocean trials with variable currents and sensor noise would test whether the current three constraints remain sufficient outside controlled lake conditions.

Load-bearing premise

The LLM will correctly identify unknown faults and produce replans that the solver accepts, and the three solver constraints will catch every physically dangerous command under real ocean conditions.

What would settle it

A lake or ocean trial in which an unknown fault occurs, the LLM generates a replan, the solver approves the commands, yet the UUV loses control, collides, or fails to complete the mission because of an undetected physical violation.

Figures

Figures reproduced from arXiv: 2605.09494 by Hong Chen, Yuanbao Chen, Yu Liu, Zixiang Tang.

Figure 1
Figure 1. Figure 1: Fault-Tolerant Control of UUV Based on LASSA Architecture. The LASSA architecture incorporates cognitive reasoning of large language models, perception-planning-scheduling of the agent, and physical constraint verification of the solver. The agent acquires operational data via onboard sensors to autonomously detect fault anomalies, performs fault mechanism analysis based on the LLM, and adaptively regulate… view at source ↗
Figure 2
Figure 2. Figure 2: Principle diagram of LASSA-based intelligent control for UUV autonomous navigation where 𝜀𝑝 (m) and 𝜀𝜓 (rad) are the position and heading deviation thresholds, respectively, and 𝛿 𝑚 𝑟 (𝑡) = 0 directly indicates a hardware rudder fault reported by the rudder￾state sensor. To avoid spurious triggering caused by transient sensor noise, the flag is confirmed only when the condition in (8) persists for a consec… view at source ↗
Figure 3
Figure 3. Figure 3: Overview of the experimental UUV All sensor signals are encoded as CAN frames and transmitted to the shore-based agent at a unified sampling rate of 𝑓𝑠 = 10 Hz via a 4G/5G wireless link. 4.2.3. Intelligent Agent and LLM Deployment For experimental convenience, the LASSA agent is de￾ployed on a shore-based computing platform that commu￾nicates with the UUV in real time over a wireless link. The platform run… view at source ↗
Figure 4
Figure 4. Figure 4: UUV navigation status in the test lake 4.4. Experimental Configurations Two experimental configurations are defined. The nor￾mal navigation experiment (Exp-N) serves as the per￾formance baseline under nominal actuator conditions. The lower-rudder fault experiment (Exp-F) introduces the rud￾der fault before launch and tests the full fault-detection, replanning, and execution pipeline [PITH_FULL_IMAGE:figur… view at source ↗
Figure 5
Figure 5. Figure 5: Aerial view of the complete Exp-N mission track, [PITH_FULL_IMAGE:figures/full_fig_p012_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Aerial view of the complete Exp-F mission track, [PITH_FULL_IMAGE:figures/full_fig_p013_6.png] view at source ↗
Figure 12
Figure 12. Figure 12: Simulation monitoring interface during the initial [PITH_FULL_IMAGE:figures/full_fig_p015_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: Simulation monitoring interface during the fault [PITH_FULL_IMAGE:figures/full_fig_p015_13.png] view at source ↗
Figure 7
Figure 7. Figure 7: Exp-S three-phase trajectory results. Top: Phase 1, path initialisation and straight navigation (stable depth, initial route blue, actual trace red). Middle: Phase 2, deviation detection and LLM-driven replanning (blue: initial path; or￾ange: replanned route; red: actual trace; depth begins to fluctuate). Bottom: Phase 3, steering-lock dive and return execution (depth reaches ≈1.2 m during the lock phase b… view at source ↗
Figure 10
Figure 10. Figure 10: Lateral (𝑋) and along-track (𝑌 ) time histories under the DVL lateral-bias fault, expressed in a planar frame aligned with the initial heading. Top: kf_only, with fixed KF covariances; the lateral channel deviates noticeably from the ground truth during and after the turn. Bottom: kf_mcp, where the LLM rescales the KF covariances at fault detection; the lateral residual is reduced and the along-track chan… view at source ↗
Figure 11
Figure 11. Figure 11: Trajectory-level comparison under the DVL lateral￾bias fault. Top row: kf_mcp, with the LLM-issued MCP covari￾ance update; the KF estimate (red) overlays the ground truth (green) throughout the loop. Bottom row: kf_only, with fixed covariances; the KF estimate exhibits visible lateral inflation and an outward bow on the return leg. Left column: 3D view; right column: top-down 𝑋𝑌 view [PITH_FULL_IMAGE:fig… view at source ↗
Figure 15
Figure 15. Figure 15: Prompt variant comparison using Kimi K2.5. Rows correspond to the detailed (P1), standard (P2), and minimal (P3) prompt variants from top to bottom; left column: normal scenario; right column: abnormal scenario. The detailed variant (P1) achieves the highest arc quality in the normal scenario and the most geometrically consistent constraint-conflict response in the abnormal scenario; the minimal variant (… view at source ↗
read the original abstract

Unmanned underwater vehicles (UUVs) operate persistently in communication-constrained environments, thus requiring high-level autonomous fault-tolerant control under faulty operating conditions. Existing approaches rely heavily on predefined hard-coded rules and struggle to achieve effective fault-tolerant control against unforeseen faults. Although large language models (LLMs) possess powerful cognitive and reasoning capabilities, their inherent hallucinations remain a major obstacle to their application in UUV control systems. This paper proposes an intelligent control method based on the LASSA (LLM-based Agent with Solver, Sensor and Actuator) architecture. Within this architecture, an LLM identifies unknown faults and accomplishes task replanning via autonomous reasoning without hard-coded rules; the intelligent agent undertakes perception, scheduling and decision evaluation; the solver verifies physical boundary feasibility constraints prior to command transmission to the actuators. This architecture suppresses physically infeasible LLM hallucinations and ensures interpretable, verifiable decision-making. Moreover, it enables fast-slow dual closed-loop collaborative control, where the slow loop undertakes high-level dynamic decision-making and the fast loop guarantees high-frequency real-time control, simultaneously balancing decision intelligence and control timeliness. Lake experiments under normal and lower-rudder-fault conditions show that the framework detects trajectory tracking abnormalities, replans the route by adjusting the turning radius from 4m to 12m and reducing speed from 2kn to 1kn, passes all three solver constraints on the first invocation, and guides the UUV to complete the full mission; under normal conditions no false fault alarms are raised throughout the run.

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

3 major / 2 minor

Summary. The paper proposes the LASSA (LLM-based Agent with Solver, Sensor and Actuator) architecture for autonomous fault-tolerant control of UUVs. An LLM identifies unknown faults and performs task replanning without hard-coded rules; an intelligent agent handles perception, scheduling, and evaluation; and a solver enforces three physical boundary feasibility constraints before commands reach the actuators. This is claimed to suppress physically infeasible LLM hallucinations while enabling fast-slow dual closed-loop control. Lake experiments under normal conditions and a single lower-rudder fault show detection of trajectory abnormalities, replanning (turning radius from 4 m to 12 m, speed from 2 kn to 1 kn), first-try passage of all solver constraints, mission completion, and no false alarms.

Significance. If the central claim holds, the work would be significant for UUV autonomy by demonstrating integration of LLM reasoning with verifiable physical constraints, reducing dependence on predefined rules for unforeseen faults, and balancing high-level decision intelligence with real-time control. The reported lake-trial outcomes (specific radius/speed changes, solver pass rate, absence of false alarms) provide concrete, falsifiable evidence of the architecture in a controlled setting.

major comments (3)
  1. [architecture description (Section 3)] The manuscript refers to 'three solver constraints' that verify physical boundary feasibility and suppress infeasible LLM hallucinations, yet these constraints are not explicitly defined, listed, or derived anywhere in the architecture description. This is load-bearing for the central claim, as the guarantee of safety rests on their completeness; without the definitions it is impossible to assess whether they would catch dangerous commands arising from currents, density gradients, or novel hallucinations outside the tested envelope.
  2. [Lake experiments (Section 4)] Lake experiments (Section 4) report success for normal operation and only one lower-rudder fault, with a single successful replan that passed constraints on the first try. No quantitative tracking-error metrics, statistical success rates across repeated trials, baseline comparisons against rule-based or model-predictive fault-tolerant controllers, or tests under ocean-relevant disturbances (currents, multi-fault states) are provided. This leaves the claim of robustness to unforeseen faults only partially supported.
  3. [fault identification and replanning (Section 3.2)] The weakest assumption—that the LLM reliably identifies unknown faults and produces replans the solver will accept—is tested only in the one reported case. No failure-mode analysis, examples of LLM hallucinations that were rejected by the solver, or discussion of how the three constraints remain sufficient when fault combinations or environmental conditions differ from the lake trial is included.
minor comments (2)
  1. [Abstract and Section 4] The abstract states quantitative outcomes (radius change, speed change, solver pass rate) but the main text should include the corresponding time-series plots or data tables for reproducibility.
  2. [architecture overview] Notation for the fast and slow loops is introduced but not consistently labeled in any diagram or pseudocode; adding explicit labels would improve clarity of the dual closed-loop claim.

Simulated Author's Rebuttal

3 responses · 1 unresolved

We thank the referee for the constructive and detailed feedback. We address each major comment point by point below, with clear indications of revisions to be incorporated in the next version of the manuscript.

read point-by-point responses
  1. Referee: [architecture description (Section 3)] The manuscript refers to 'three solver constraints' that verify physical boundary feasibility and suppress infeasible LLM hallucinations, yet these constraints are not explicitly defined, listed, or derived anywhere in the architecture description. This is load-bearing for the central claim, as the guarantee of safety rests on their completeness; without the definitions it is impossible to assess whether they would catch dangerous commands arising from currents, density gradients, or novel hallucinations outside the tested envelope.

    Authors: We agree that the three solver constraints must be explicitly defined, listed, and derived to support the central safety claim. This was insufficiently detailed in the original manuscript. In the revised version we will add a dedicated subsection (or expanded paragraph) within Section 3 that states the three physical boundary feasibility constraints in mathematical form, derives them from the UUV dynamics and actuator limits, and explains how each suppresses specific classes of infeasible LLM outputs. This revision will directly address the referee's concern about completeness and allow evaluation against untested disturbances. revision: yes

  2. Referee: [Lake experiments (Section 4)] Lake experiments (Section 4) report success for normal operation and only one lower-rudder fault, with a single successful replan that passed constraints on the first try. No quantitative tracking-error metrics, statistical success rates across repeated trials, baseline comparisons against rule-based or model-predictive fault-tolerant controllers, or tests under ocean-relevant disturbances (currents, multi-fault states) are provided. This leaves the claim of robustness to unforeseen faults only partially supported.

    Authors: We acknowledge that the experimental section is limited to a single fault type in a lake setting and lacks several quantitative elements. In the revision we will add the available quantitative tracking-error metrics (position RMSE, heading error, and speed deviation) extracted from the recorded lake-trial data for both normal and faulted runs. We will also insert an explicit limitations paragraph noting the absence of repeated-trial statistics, baseline controller comparisons, and ocean-disturbance tests, framing these as necessary future work. Because the current dataset does not contain the additional trials or comparisons requested, we cannot fully satisfy those aspects without new experiments. revision: partial

  3. Referee: [fault identification and replanning (Section 3.2)] The weakest assumption—that the LLM reliably identifies unknown faults and produces replans the solver will accept—is tested only in the one reported case. No failure-mode analysis, examples of LLM hallucinations that were rejected by the solver, or discussion of how the three constraints remain sufficient when fault combinations or environmental conditions differ from the lake trial is included.

    Authors: The demonstration of LLM-based fault identification and replanning is indeed based on the single lake-trial case presented. We will expand Section 3.2 with a failure-mode discussion that (a) illustrates how the solver would reject example classes of physically infeasible LLM outputs using the (now explicitly defined) constraints and (b) states the assumptions under which the three constraints are expected to remain sufficient. We will also add a short paragraph on the limits of the current validation with respect to multi-fault combinations and differing environmental conditions, again marking broader analysis as future work. revision: partial

standing simulated objections not resolved
  • Statistical success rates over repeated trials, direct baseline comparisons with rule-based or MPC fault-tolerant controllers, and experimental validation under ocean currents or multi-fault states cannot be provided from the existing lake-trial dataset and would require additional field campaigns.

Circularity Check

0 steps flagged

No circularity: claims rest on experimental validation of architecture, not self-referential equations or derivations

full rationale

The paper describes the LASSA architecture (LLM agent + solver + sensor/actuator) for UUV fault-tolerant control and reports lake trial results under normal and single-fault conditions. No equations, first-principles derivations, fitted parameters, or predictions are presented that reduce to their own inputs by construction. The central claims (hallucination suppression via solver constraints, dual-loop control) are justified by observed experimental outcomes rather than any self-definitional loop, self-citation load-bearing premise, or ansatz smuggled through prior work. The three solver constraints are invoked as a practical filter but are not mathematically derived from the target result itself. This is a standard architecture-plus-experiment paper with no detectable circularity in its reasoning chain.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 1 invented entities

The central claim depends on two domain assumptions about LLM reasoning and solver coverage; no free parameters or new physical entities are introduced.

axioms (2)
  • domain assumption Large language models can perform reliable autonomous reasoning to identify unknown faults and replan tasks without hard-coded rules
    Invoked in the description of the LLM agent's role in the LASSA architecture.
  • domain assumption The solver's physical boundary constraints are comprehensive enough to block all unsafe LLM-generated commands
    Central to the claim that hallucinations are suppressed and decisions remain verifiable.
invented entities (1)
  • LASSA architecture no independent evidence
    purpose: Integrate LLM reasoning with a feasibility solver and dual control loops for safe autonomous UUV operation
    Newly proposed framework; no independent evidence outside the paper is provided.

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