Universal calculation method for optical reflection characteristics of dihedral reflector with lambert surfaces as per radiative balance method

Object and purpose of research. This paper discusses the ways to improve current calculation method for reflection parameters during remote laser detection and ranging by means of a dihedral reflector with Lambert surfaces equal to reflection coefficients of each surface as per the generalized method of radiative balance. The study also discusses the evolution of optical methods and analytical research tools in this domain, as well as laser signature calculation for various ships and other structures. Materials and methods. Analytical calculation methods, software, calculation methods for remote laser detection and ranging taking into account optical parameters and reflection coefficient of dihedral reflectors used to calculate laser signature of ship structures. Main results. Improved efficiency and accuracy of calculation methods for laser detection and ranging with respect to dihedral reflectors for surface ships. Conclusion. Calculation methods of remote laser detection and ranging suggested in this paper offer additional capabilities in lidar signature measurements of ships and other structures.

High Spatial Resolution Three-Dimensional Imaging Static Unitary Detector-Based Laser Detection and Ranging Sensor

This paper presents a static unitary detector (STUD)-based laser detection and ranging (LADAR) sensor with a 16-to-1 transimpedance-combining amplifier for high spatial resolution three-dimensional (3-D) applications. In order to readout the large size of a photodetector for better results of 3-D information without any reduction of the bandwidth, the partitioning photosensitive cell method is embedded in a 16-to-1 transimpedance-combining amplifier. The effective number of partitioning photosensitive cells and signal-combining stages are selected based on the analysis of the partitioning photosensitive cell method for the optimum performance of a transimpedance-combining amplifier. A prototype chip is fabricated in a 0.18-μm CMOS technology. The input referred noise is 41.9 pA/√Hz with a bandwidth of 230 MHz and a transimpedance gain of 70.4 dB·Ω. The total power consumption of the prototype chip is approximately 86 mW from a 1.8-V supply, and the TICA consumes approximately 15.4 mW of it.

A High-Multi Target Resolution Focal Plane Array-Based Laser Detection and Ranging Sensor

This paper introduces a digital-assisted multiple echo detection scheme, which utilizes the waste time of the full serial data readout period in a focal plane array (FPA)-based laser detection and ranging (LADAR) receiver. With the support of an external digital signal processor (DSP) and additional analog memory inserted into the receiver, the proposed readout scheme can effectively enhance multi-target resolution (MTR) three times higher than the conventional FPA-based LADAR, while maintaining low power consumption and a small area. A prototype chip was fabricated in a 0.18-μm CMOS process with an 8 × 8 FPA configuration, where each single receiver pixel occupied an area of 100 μm × 100 μm. The single receiver achieved an MTR of 20 ns with 7.47 mW power dissipation, an input referred noise current of 4.48 pA/√Hz with a bandwidth 530 MHz, a minimum detectable signal (MDS) of 340 nA, a maximum walk error of 2.2 ns, and a maximum non-linearity of 0.05% among the captured multiple echo images.