Norman S. Kopeika

TL;DR: In this article, a super resolution method with basic DSP algorithms was demonstrated using the 2X18 double row camera, and small details and small objects were observed using those methods. But the resolution of MMW images are blurred and unclear and thus it is difficult to see the details of small objects.

TL;DR: The experimental results and the analysis indicate that the image quality of this MMW imaging system is limited mostly by the noise, and the blur is dominated by the pixel sensor size, so the MMW image might be improved by oversampling, given that noise reduction is achieved.

TL;DR: In this article, an extension of the Navy Aerosol model NAM was proposed based on analysis of an extensive series of measurements at the Irish Atlantic Coast and at the French Mediterranean Coast.

TL;DR: In this paper, an upconversion of millimeter wave and terahertz radiation to the visual band using a very inexpensive miniature glow discharge detector (GDD) and a silicon photodetector is presented.

Abstract: Laser satellite communication has become especially attractive in recent years. Because the laser beam width is narrow than in the RF or microwave range, the transmitted optical power may be significantly reduced. This leads to development of miniature communication systems with extremely low power consumption. On the other hand, the laser communication channel is very sensitive to vibrations of the optical platform. These vibrations cause angular noise in laser beam pointing, comparable to the laser beam width. As result, as significant portion of the optical power between transmitter and receiver is lost and the bit error rate is increased. Consequently, vibration noise control is a critical problem in laser satellite communication. The direction of the laser beam is corrected with a fast steering mirror (FSM). In this paper are presented two approaches for the FSM control. One is the feedback control that uses an LQG algorithm. The second is the direct feed- forward control when vibration noise is measured by three orthogonal accelerometers and drives directly the F SM. The performances of each approach are evaluated using MATLAB simulations.