Proceedings Volume 6550: Laser Radar Technology and Applications XII
The USU LadarSIM software package is a ladar system engineering tool that has recently been enhanced to include the modeling of the radiometry of Ladar beam footprints. This paper will discuss our validation of the radiometric model and present a practical approach to future validation work. In order to validate complicated and interrelated factors affecting radiometry, a systematic approach had to be developed. Data for known parameters were first gathered then unknown parameters of the system were determined from simulation test scenarios. This was done in a way to isolate as many unknown variables as possible, then build on the previously obtained results. First, the appropriate voltage threshold levels of the discrimination electronics were set by analyzing the number of false alarms seen in actual data sets. With this threshold set, the system noise was then adjusted to achieve the appropriate number of dropouts. Once a suitable noise level was found, the range errors of the simulated and actual data sets were compared and studied. Predicted errors in range measurements were analyzed using two methods: first by examining the range error of a surface with known reflectivity and second by examining the range errors for specific detectors with known responsivities. This provided insight into the discrimination method and receiver electronics used in the actual system.
B. C. Leishman, S. E. Budge, and R. T. Pack, “A validation procedure for a LADAR system radiometric simulation model,” in Laser Radar Technology and Applications XII, M. D. Turner and G. W. Kamerman, Eds., vol. 6550. Orlando, FL, USA: SPIE, May 2007, p. 65500G. [Online]. Available: http://link.aip.org/link/?PSI/6550/65500G/1