Analytical results are presented showing improved detection and location performance in a staring sensor using a hexagonal detector array or having the capability to adjust the size of its blur spot (variable focus). Square and hexagonal detector arrays are compared for detection probability versus focus, for location accuracy versus focus and signal-to-noise ratio, and for location accuracy versus blur size and detector array fill factor.
J. Allen Cox, J. Allen Cox,
"Advantages Of Hexagonal Detectors And Variable Focus For Point-Source Location", Proc. SPIE 0750, Infrared Systems and Components, (20 September 1987); doi: 10.1117/12.939859; https://doi.org/10.1117/12.939859