2,125 research outputs found
Attitude-referenced radiometer study. Part 2: Primary calibration system
A primary calibration system, PCS, for infrared radiometers has been developed, built, and tested. The system allows radiometers to be calibrated with less than 1 percent error for use in earth coverage horizon measurements, earth resources surveys, and synoptic meteorological measurement. The final design, fabrication and test of the PCS are reported. A detailed description of the PCS construction is presented, along with the results of a complete series of functional tests. Test to verify the source thermal characteristics, collimator reflectance, and output beam characteristics are described and their results presented
Bidirectional Sampling Based Search Without Two Point Boundary Value Solution
Bidirectional motion planning approaches decrease planning time, on average,
compared to their unidirectional counterparts. In single-query feasible motion
planning, using bidirectional search to find a continuous motion plan requires
an edge connection between the forward and reverse search trees. Such a
tree-tree connection requires solving a two-point Boundary Value Problem (BVP).
However, a two-point BVP solution can be difficult or impossible to calculate
for many systems. We present a novel bidirectional search strategy that does
not require solving the two-point BVP. Instead of connecting the forward and
reverse trees directly, the reverse tree's cost information is used as a
guiding heuristic for the forward search. This enables the forward search to
quickly converge to a feasible solution without solving the two-point BVP. We
propose two new algorithms (GBRRT and GABRRT) that use this strategy and run
multiple software simulations using multiple dynamical systems and real-world
hardware experiments to show that our algorithms perform on-par or better than
existing state-of-the-art methods in quickly finding an initial feasible
solution.Comment: Journal version (Video: https://youtu.be/Rumg66UHfyQ
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