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A Gyroless Algorithm with Multi-Hypothesis Initialization for Projectile Navigation.

Nabil Jardak1, Ronan Adam1, Sébastien Changey1

  • 1French-German Research Institute of Saint-Louis, 5 Rue du Général Casssagnou, 68300 Saint-Louis, France.

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Summary
This summary is machine-generated.

This study introduces a novel gyroless navigation algorithm for projectiles, utilizing inexpensive magneto-resistive sensors. The system achieves accurate angular estimation despite extreme launch conditions, offering a viable alternative to traditional gyroscopes.

Keywords:
gyrolessinitializationmagnetometernavigationobservabilityprojectiles

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Area of Science:

  • Aerospace Engineering
  • Navigation Systems
  • Sensor Technology

Background:

  • Projectiles require robust onboard navigation due to extreme launch accelerations (20,000 g+) and high spin rates.
  • Traditional gun-hardened rate gyroscopes are scarce and expensive, limiting navigation options for guided projectiles.
  • Magneto-resistive sensors offer a cost-effective and durable alternative for angular estimation in harsh projectile environments.

Purpose of the Study:

  • To develop and present a novel gyroless navigation algorithm for projectiles.
  • To address the challenges of angular estimation without traditional gyroscopes in high-g environments.
  • To propose a solution for filter initialization dependency in projectile navigation systems.

Main Methods:

  • A gyroless navigation algorithm using attitude kinematics from past estimates.
  • Integration of magnetometer and GPS measurements into the attitude estimation filter.
  • Development of a multi-hypothesis initialization algorithm to overcome filter dependency.
  • Addressing observability issues with non-calibrated magnetometers.

Main Results:

  • The proposed algorithm provides a high-rate navigation solution for projectiles.
  • Demonstrated effective angular estimation using magneto-resistive sensors and GPS.
  • Successfully mitigated initialization dependency through a multi-hypothesis approach.
  • The system shows promising performance in simulated projectile navigation scenarios.

Conclusions:

  • A gyroless navigation algorithm is feasible and effective for projectiles.
  • Magneto-resistive sensors are a viable alternative to gyroscopes for projectile navigation.
  • The multi-hypothesis initialization enhances the robustness of the navigation system.