Innovative Techniques for High-Resolution Imaging and Precision Tracking
Abstract
Collection of quantitative data on signatures of space objects requires knowledge of atmospheric transmission at the geographical site of interest. A method for direct measurement utilizing a unique real-time multipath laser radar is described. Techniques are analytically evaluated for optical autodyne detection which offers the potential of improving the performance of passive and conventional active sensors in detection, recognition and tracking. Optical autodyne detection is a direct detection method for measuring relative Doppler shifts using a coherent laser illuminator. Various frequency components of the received optical signal are mixed together on a square law photodetector to produce an output containing the spectrum of frequencies related to the relative velocity spectrum of the target and background components. Fundamental limits are established for the accuracy of the estimation of range and velocity resolution for autodyne detection of a two point target with a pulsed laser radar. The Cramer-Rao bounds were computed for both the signal noise and background limited cases. Laser radar, Autodyne tracking, Doppler tracking, Atmospheric extinction coefficients.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 20, 1990
- Accession Number
- ADA221380
Entities
People
- D. Gutkowicz-krusin
- G. Lind
- J. Nowakowski