Abstract
We propose a wide-angle lens array scheme, which can provide spatial
acquisition with ultrawide field of view (FOV) in free-space optical (FSO)
links. This acquisition array is composed of M sub-arrays, with each subarray including N receiving elements. The N elements in a subarray are arranged in the same direction to
receive the laser beacon together, while the M subarrays are arranged in different directions to cover an
ultrawide FOV (a hemisphere with a solid angle of 2π). The N elements in a subarray can increase the total aperture size to
restrict the laser power fluctuation induced by atmospheric scintillation.
The M subarrays can disperse the ultrawide FOV to reduce the received
background power on each element. Therefore, the N elements in a subarray and the M subarrays can both contribute to the improvement of the SNR,
which can improve the spatial acquisition performance of the wide-angle
array. The missed detection probability (MDP), as a parameter to describe
the spatial acquisition performance, is investigated for the wide-angle lens
array spatial acquisition scheme under atmospheric scintillation and
background radiation. Results show that the proposed array scheme can
improve the spatial acquisition performance degraded by atmospheric
scintillation and background radiation. The acquisition performance can be
further enhanced with the increase of element number N in a subarray and subarray number M, where the N elements in a subarray and the M subarrays are designed to suppress atmospheric scintillation and
background radiation, respectively.
© 2010 IEEE
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