13 September 1989 Optimization Of Laser Beam Spread To Maximize Laser Radar Probability Of Detection
Author Affiliations +
Proceedings Volume 1103, Laser Radar IV; (1989); doi: 10.1117/12.960562
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States
Abstract
This paper discusses the affect on probability of detection (Pd) and probability of false alarm (Pfa) of the illuminator laser beam width. Laser radar systems are required to optimize performance while minimizing the laser energy thereby requiring the illuminated target region to be optimized with regard to the uncertainty of the target location. A beam spread much larger than the uncertainty volume of the target can have a high Pd but would require excessive laser energy. A very narrow beam spread would minimize laser energy but not have a high Pd. The optimum beam spread for laser illumination of a point target with a normal distribution for its position uncertainty has been determined for both direct and heterodyne (coherent) detection. This work assumes a Gaussian laser illuminator beam spread and a Gaussian target uncertainty distribution. Values for Pd and Pfa have been computed for both direct and heterodyne detection. The results were then averaged over the intensity distribution expected for the illuminator beam and the target uncertainty. Contour plots were computed for fixed signal-to-noise ratio (SNR), defined as the on-axis SNR for the target. The minima for each contour can be plotted for various ratios of illuminator beam spread to target uncertainty. The results determine the optimum ratio for a given Pd, Pfa, SNR, and detection technique. The affect of laser speckle was also included. This method of optimum beam size determination proves extremely useful in many strategic laser radar systems.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dean H. Liskow, Joseph N. Paranto, "Optimization Of Laser Beam Spread To Maximize Laser Radar Probability Of Detection", Proc. SPIE 1103, Laser Radar IV, (13 September 1989); doi: 10.1117/12.960562; https://doi.org/10.1117/12.960562
PROCEEDINGS
9 PAGES


SHARE
KEYWORDS
Palladium

LIDAR

Speckle

Signal to noise ratio

Fiber optic illuminators

Interference (communication)

Laser energy

RELATED CONTENT

Time and range averaging of lidar echoes using APD based...
Proceedings of SPIE (October 22 1999)
Range precision of direct-detection laser radar systems
Proceedings of SPIE (September 13 2004)
Statistical decision in Mie LIDAR detection
Proceedings of SPIE (September 30 2003)
Scaled Experiments For Assessment Of Precise Active Tracking
Proceedings of SPIE (February 01 1987)

Back to Top