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The stellar refraction navigation is a type of autonomous celestial navigation method for satellites that uses high-accuracy star sensors to obtain the stellar refraction. The apparent height and the stellar refraction angle are two kinds of measurements for the satellite stellar refraction navigation system. A better navigation performance can be achieved by the stellar refraction angle rather than...
Aperture averaging effect can smooth the optical signal fluctuations. Generally, the aperture function is assumed to be a single circle when its aperture averaging function K0 is calculated. In recent years, K0 function of a complex receiving aperture is also discussed. Actually, Cassegrain system is usually used as a telescope for free-space optical communication. There is a little bit difference...
The air supply system, providing oxygen for the fuel cell stack, is one of the most important subsystems of a typical proton exchange membrane fuel cell (PEMFC) system. In this paper, a feedback linearization controller is proposed to control the air mass flow rate to avoid the oxygen starvation and reduce energy consumption in the air supply system. To clearly describe the characteristics of the...
Although many countries have implemented a series of stratospheric airship research programs since the late 1990s, there is still no successful airship that completely achieved the goal that could stay in stratosphere for months or years. In the absence of a recognized technology of stratospheric airship, many technical issues need to be resolved, such as the basic structure and the configuration...
The 3GPP Long Term Evolution (LTE) Release-8 specifications are designed to deliver higher peak data rates, higher throughput and lower air-interface latency compared to 2G and 3G systems. This higher performance will make it possible to support more demanding applications beyond web-browsing and voice, requiring higher data rates and stricter QoS constraints. Video services are becoming increasingly...
In order to meet the urgent need for mesoscale eddy data assimilation, here we built a model for dissymmetrical ocean mesoscale eddy. It adopted the e-folding radius and assumed a Gaussian decay of the eddy amplitude with horizontal distance from the centre. We didn't regarded the structure of eddy was symmetrical again and introduce the left radius and right radius on each layer. Thus the model can...
In this paper, we introduce a model for designing a automatic guided vehicle system (AGVS) with multiple automatic guided vehicles (AGVs) operating under some given strategies and fixed layout. In our model, we take two cargoes into consideration, i.e. two cargoes entering AGVS. We make an assumption that we have known all the information about the first cargo already such as the entering entry and...
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