Robust Visual SLAM for UAV Navigation in GPS-Denied and Degraded Environments: A Multi-Paradigm Evaluation and Deployment Study

Prasoon Kumar, Akshay Deepak, Sandeep Kumar

#2641 of 3576 · Robotics
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10501750
32%
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11
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23
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34
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4.5/ 10
Significance
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Abstract

Reliable localization in GPS-denied, visually degraded environments is critical for autonomous UAV opera- tions. This paper presents a systematic comparative evaluation of five V-SLAM systems ORB-SLAM3, DPVO, DROID-SLAM, DUSt3R, and MASt3R spanning classical, deep learning, recurrent, and Vision Transformer (ViT) paradigms. Experiments are conducted on curated sequences from four public benchmarks (TUM RGB-D, EuRoC MAV, UMA-VI, SubT-MRS) and a custom monocular indoor dataset under five controlled degradation conditions (normal, low light, dust haze, motion blur, and combined), with sub-millimeter Vicon ground truth. Results show that ORB-SLAM3 fails critically under severe degradation (62.4% overall TSR; 0% under dense haze), while learning-based methods remain robust: MASt3R achieves the lowest degraded ATE (0.027 m) and DUSt3R the highest tracking success (96.5%). DPVO offers the best efficiency robustness trade-off (18.6 FPS, 3.1 GB GPU memory, 86.1% TSR), making it the preferred choice for memory-constrained embedded platforms. Embedded deployment analysis across NVIDIA Jetson platforms provides actionable guidelines for SLAM selection under SWaP-constrained UAV scenarios.

AI Impact Assessments

(1 models)

Scientific Impact Assessment

1. Core Contribution

This paper presents a systematic comparative evaluation of five Visual SLAM systems—ORB-SLAM3 (classical), DPVO (deep patch CNN), DROID-SLAM (recurrent differentiable), DUSt3R (ViT), and MASt3R (ViT with learned descriptors)—under controlled visual degradation conditions relevant to UAV navigation in GPS-denied environments. The study spans four public benchmarks and a custom indoor dataset with five degradation categories (normal, low light, dust haze, motion blur, combined), accompanied by embedded deployment profiling on NVIDIA Jetson platforms.

The primary value proposition is a decision-support framework for practitioners selecting SLAM algorithms under SWaP (Size, Weight, and Power) constraints, rather than a novel algorithmic contribution. The paper fills a gap by providing cross-paradigm comparison under degraded conditions that are individually studied but rarely combined in existing benchmarks.

2. Methodological Rigor

Strengths in experimental design:

  • Statistical significance testing with paired t-tests and Bonferroni correction across 10 pairwise comparisons is appropriate and well-executed.
  • The degradation model is formally defined using physically motivated operators (Koschmieder's law for haze, intensity scaling for low light, motion kernels for blur).
  • Sub-millimeter Vicon ground truth for the custom dataset is gold-standard.
  • Multiple metrics (ATE, RPE, TSR, FPS, GPU memory) provide a multi-dimensional evaluation.
  • Significant concerns:

  • The custom dataset construction methodology is unclear. The paper states sequences are "hand-picked" from public datasets and augmented with synthetic degradation, but it also describes a physical 12×8×3m testbed with a hazer and controlled lighting. The relationship between these two data sources is ambiguous—how many sequences come from each? This muddies the reproducibility.
  • The degradation conditions are primarily synthetic (intensity scaling, additive haze models), which may not capture the full complexity of real-world degradation (non-uniform lighting, spatially varying dust density, sensor noise characteristics). The claim of "controlled replication" overstates the fidelity.
  • DUSt3R and MASt3R are not SLAM systems per se—they are pairwise 3D reconstruction methods. The paper describes a "unified benchmark pipeline" with loop closure modules, but it's unclear how these were adapted into a full SLAM pipeline. Were additional components added? This is a critical detail that is insufficiently documented.
  • The paper claims to evaluate on "curated sequences from four public benchmarks," but the evaluation methodology essentially treats each dataset as representing a single degradation modality (TUM=normal, EuRoC=motion blur, UMA-VI=low light, SubT-MRS=dust). This conflation of dataset with degradation type means confounding factors (environment geometry, camera model, trajectory complexity) are not controlled.
  • The embedded deployment analysis (Tables VIII-IX) appears to be inference latency measurements rather than full SLAM pipeline benchmarking. Whether loop closure, map management, and other backend components are included is unclear.
  • 3. Potential Impact

    Practical utility: The deployment recommendations stratified by platform tier (no GPU → Jetson Xavier NX → Jetson AGX Orin → high-end) are genuinely useful for UAV system integrators. The finding that DPVO offers the best efficiency-robustness trade-off for memory-constrained platforms is actionable.

    Academic impact: The cross-paradigm comparison is informative but primarily confirmatory—it is expected that learning-based methods outperform classical feature extraction under degradation, and that ViT-based methods with global attention are more robust than local patch methods. The architectural insights (global attention vs. local features, learned geometric priors) are well-articulated but not surprising.

    Benchmark contribution: The custom dataset could be valuable if released, but the paper does not commit to public release of the custom dataset (only linking to existing public repositories). Without the dataset, reproducibility is limited.

    4. Timeliness & Relevance

    The paper addresses a timely and practically important problem. GPS-denied navigation is a genuine capability gap, and the emergence of ViT-based reconstruction methods (DUSt3R/MASt3R appearing in 2024) makes a comparative evaluation relevant. The defence framing, while sometimes overstated, highlights real deployment scenarios.

    However, the paper arrives in a rapidly evolving landscape. Gaussian splatting-based SLAM, foundation model-based approaches, and newer ViT variants are emerging quickly. The evaluation may become dated relatively fast.

    5. Strengths & Limitations

    Key Strengths:

  • Comprehensive multi-paradigm comparison spanning four distinct architectural families
  • Well-structured failure mode analysis (Table X) providing qualitative understanding of when and why each system fails
  • Power efficiency analysis (FPS/Watt) is rarely reported but critical for UAV deployment
  • Statistical rigor with appropriate multiple comparison correction
  • Notable Weaknesses:

  • No novel algorithm, architecture, or dataset contribution—purely evaluative
  • The "custom dataset" description is contradictory and insufficiently detailed for reproduction
  • DUSt3R and MASt3R integration into a SLAM pipeline is inadequately described; these are fundamentally different from the other three systems (pairwise reconstruction vs. sequential SLAM)
  • Some numbers are inconsistent across the paper (e.g., ORB-SLAM3 TSR reported as 62.4%, 61.2% in different sections; DPVO TSR as 86.1%, 87.3%)
  • The paper is dated May 2026 on arXiv but references works through 2025, and some claims about "future work" include validation on datasets that already exist—suggesting the work may be incomplete
  • Missing comparison with other relevant systems (e.g., DSO, SVO, Kimera) and no comparison with visual-inertial configurations despite their obvious relevance
  • The defence framing occasionally borders on speculative and distracts from the technical content
  • Reproducibility: While official repositories for all five systems are linked, the evaluation scripts, custom dataset, configuration files, and adaptation code (especially for DUSt3R/MASt3R as SLAM) are not provided, limiting reproducibility.

    Summary

    This is a competent benchmarking study that provides useful practical guidance for SLAM system selection under degraded conditions. Its primary value lies in the breadth of comparison and the deployment-oriented analysis. However, the lack of algorithmic novelty, inconsistencies in reported numbers, ambiguous dataset methodology, and insufficient documentation of how non-SLAM systems (DUSt3R/MASt3R) were integrated into the evaluation pipeline limit its scientific contribution. The findings, while useful, are largely confirmatory of expected trends.

    Rating:4.5/ 10
    Significance 5Rigor 4Novelty 3.5Clarity 5.5

    Generated May 6, 2026

    Comparison History (34)

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