نتایج جستجو برای: satellite laser range finding
تعداد نتایج: 1135449 فیلتر نتایج به سال:
The BepiColombo Laser Altimeter (BELA) has been selected for flight on board the European Space Agency’s BepiColombo Mercury Planetary Orbiter (MPO). The experiment is intended to be Europe’s first planetary laser altimeter system. Although the proposed system has similarities to the Mercury Laser Altimeter (MLA) currently flying on board NASA’s MESSENGER mission to Mercury, the specific orbit ...
The purpose of this study were to 1) demonstrate the effect of infrared laser radiation on the sensory nerve latency of peripheral nerve, and 2) determine temperature changes in the tissue surrounding of the treated area. Fifty health subjects without an history of right and left upper extremity pathological conditions were divided into two groups: laser (n=30) and placebo (n=20) groups. Six 1 ...
satellite thermal control ensures safe operating temperature ranges for satellite components throughout the mission life. effects of altitude, spin, and position of satellite radiator(s) on the thermal control of a small low earth orbit (leo) satellite have been studied. results show that change in satellite altitude, in the range considered here, does not produce critical thermal conditions. h...
With a total of four new regional and global navigation satellite systems that have launched first satellites or even started an operational service, the GNSS landscape has experienced major changes in recent years. As part of the Multi-GNSS Experiment (MGEX) of the International GNSS Service (IGS), a global network of multi-GNSS monitoring stations has been established and various analysis cen...
to be broadened in the “plateau” region. 27. G. G. Paulus et al., Nature 414, 182 (2001). 28. Note that tiny variations in the peak laser intensity can make the harmonic structure more or less pronounced as revealed by spectra c and d in Fig. 3. However, the modulation depth was kept below 25% in all measurements shown in Fig. 5, resulting in negligible fractional satellite energy content. 29. ...
Although HDR content processing, coding and quality assessment have been largely addressed in the last few years, little to no work has been concentrating on how to assess quality in HDR for 360◦ or omnidirectional content. This paper is an attempt to answer to various questions in this direction. As a minimum, a new data set for 360◦ HDR content is proposed and a new methodology is designed to...
purpose: to evaluate the success rate of nd:yag laser membranotomy in patients with diabetic premacular hemorrhage. methods: this interventional case series included 24 eyes of 22 patients referred to retina clinic of farabi eye hospital, tehran, iran during 2000-2007 with chief complaint of sudden loss of vision and clinical diagnosis of premacular hemorrhage due to proliferative diabetic reti...
Human observers are able to make fine discriminations of surface gloss. What cues are they using to perform this task? In previous studies, we identified two reflection-related cues—the contrast of the reflected image (c, contrast gloss) and the sharpness of reflected image (d, distinctness-of-image gloss)--but these were for objects rendered in standard dynamic range (SDR) images with compress...
For the disadvantage of contact method in range finding, such as physical effects, high requirements of environment, operating errors and so on, a different method is proposed as required--digital image processing for range finding. This non-contact method could be finished after the collection and handling of laser spots by USB camera, the extraction of feature information of image, and the bu...
Precision timekeeping has been a driving force in innovation, from defining agricultural seasons to atomic clocks enabling satellite navigation, broadband communication and high-speed trading. We are on the verge of a revolution in atomic timekeeping, where optical clocks promise an over thousand-fold improvement in stability and accuracy. However, complex setups and sensitivity to thermal radi...
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