  Consider a ultraviolet (UV) scattering communication system where the
position of the transmitter is fixed and the receiver can move around on the
ground. To obtain the link gain effectively and economically, we propose an
algorithm based on one-dimensional (1D) numerical integration and an off-line
data library. Moreover, we analyze the 2D scattering intensity distributions
for both LED and laser, and observe that the contours can be well fitted by
elliptic models. The relationships between the characteristics of fitting
ellipses and the source parameters are provided by numerical results.
