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Noise sources in laser radar systems.

D Letalick, I Renhorn, O Steinvall

|June 18, 2010

Summary

This summary is machine-generated.

This study investigated laser radar phase noise, identifying vibrations and mechanical stability as key performance limiters. A new model accounts for stray light, speckle, and Doppler shifts in diffuse targets.

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Area of Science:

Optical Engineering
Signal Processing
Laser Systems

Background:

Laser radar performance is fundamentally limited by phase noise.
Understanding these limitations is crucial for system optimization.

Purpose of the Study:

Investigate the phase noise in a testbed laser radar system.
Identify sources of phase noise beyond standard laser components.
Develop a comprehensive model for signal variations from diffuse targets.

Main Methods:

Characterized phase noise from transmitter and local oscillator lasers.
Assessed phase noise contributions from mechanical vibrations (fans).
Evaluated the impact of platform mechanical structure stability.
Developed a target signal variation model incorporating stray light, speckle decorrelation, and Doppler shift.

Main Results:

Vibrations from cooling systems and power supply fans introduce significant phase noise.
Mechanical platform stability is critical for maintaining low phase noise.
The developed model accurately predicts signal variations from diffuse targets.

Conclusions:

Laser radar performance is influenced by both internal laser noise and external environmental factors like vibration.
Mechanical design and vibration isolation are essential for high-performance laser radar.
The new target signal model enhances the understanding of diffuse target returns.