To address the issues of maritime border surveillance or long range UAV identification, we develop two laser imagers (a 2D and a 3D system) with long range (LR) capacities to improve significantly the performances in terms of scope of monitoring and persistence of functions (e.g. H24, degraded visibility...). These systems are based on a new generation of focal plane arrays (FPA) with Avalanche PhotoDiode (APD) and are combined with high-performance image processing ("real-time") devoted to superresolution or tracking. In this paper, we first present the results of several maritime surveillance or Counter- Unmanned Aircraft System (C-UAS) demonstrations respectively conducted on a coastal site and a sensitive area. Comparisons between passive and active sensors are shown. The measurements obtained on various maritime targets are completed by end to end modelling in order to assess the systems performances in various atmospheric environments.