Research on rotational velocity measurement performance enhancement based on an amplitude-phase joint modulation...

Area of Science:

• Optical physics
• Remote sensing
• Signal processing

Background:

• Atmospheric turbulence introduces significant measurement errors in remote rotational velocity detection.
• Existing methods like the Gerchberg-Saxton (GS) algorithm struggle with strong turbulence and complex optical conditions.

Purpose of the Study:

• To develop a novel algorithm for robust remote rotational velocity measurement under atmospheric turbulence.
• To improve accuracy and performance metrics compared to conventional methods.

Main Methods:

• Proposed an amplitude-phase joint modulation phase retrieval (APJM-PR) algorithm.
• Implemented a dual optimization strategy: gradient-based correction and random perturbation.
• Integrated frequency-domain constraints and spatial-domain nonlinear feedback.

Main Results:

• APJM-PR demonstrated superior performance in strong turbulence compared to the GS algorithm.
• Achieved satisfactory mode purity with fewer iterations and improved key performance metrics.
• Showcased significant enhancement in optical field and spectral performance for high-order OAM modes and long-distance propagation.

Conclusions:

• The APJM-PR algorithm offers superior turbulence compensation capability.
• Achieved velocity measurement accuracy standard deviation of 10⁻⁴ rad/s.
• Demonstrated potential for future improvements in remote rotational velocity measurement accuracy.