- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 5th IEEE International Workshop on Metrology for AeroSpace (MetroAeroSpace) - Rome, Italy (2018.6.20-2018.6.22)] 2018 5th IEEE International Workshop on Metrology for AeroSpace (MetroAeroSpace) - Alignment Verification of a Star Tracker Cluster and a Space Telescope for Land-survey Satellite
摘要： For high pointing accuracy space telescope it is necessary to provide the precise determination of relative angular position for the telescope and star sensors. For solving this problem, methods developed are presented which based on onboard discrete ?ltering of measurements, approximation and spline interpolation. We represent accuracy estimates obtained by computer simulation for the alignment veri?cation of the star sensors and telescope onboard a land-survey satellite.
关键词： land-survey telescope,alignment veri?cation
更新于2025-09-23 15:21:21
-
[IEEE 2018 Global Internet of Things Summit (GIoTS) - Bilbao, Spain (2018.6.4-2018.6.7)] 2018 Global Internet of Things Summit (GIoTS) - Lighting IoT Test Environment (LITE) Platform: Evaluating Light-Powered, Energy HarvestingEmbedded Systems
摘要： As interest in the Internet of Things (IoT) grows, so does the requirement for distributed sensing, computation, and communication. Some projections reach a scale of over a trillion wireless devices, which creates a battery replacement challenge that is unsustainable for both human resources (replacement effort) and the environment (disposal). One ?eld of research that strives to meet this challenge is energy harvesting (EH) for self-powered systems. Photovoltaic (PV) cells enable EH capabilities and provide high energy density. They are also typically inexpensive, often making them the transducer of choice for self-powered systems. However, the performance of these EH nodes is rarely evaluated under realistic IoT environmental conditions, such as variable indoor lighting. Under low light, PV cells draw very little power and could place the self-powered system in a standby or even nonfunctional state. Most evaluations of EH systems in various lighting environments use software simulations to predict the behaviour of these nodes, but approximate models lack the exactness required to help with veri?cation of hardware in real conditions. Another approach is user testing in the ?eld, but this arduous solution would incur a variety of costs. This paper presents a third alternative: the Lighting IoT Test Environment (LITE) platform. The LITE platform is a tool that provides insight on how light-powered EH systems operate in low lighting environments. The LITE platform is able to physically emulate a variety of indoor and outdoor lighting sources with a novel mapping technique and provide time-series, environmental simulation of that source on a device under test (DUT). The light source emulation and time-series simulation capabilities are characterized with a worst case mean absolute percentage error (MAPE) of 3.2% and MAPE of 0.5%, respectively. By enabling engineers to accurately understand how these self-powered systems work under real world conditions, the LITE platform will better equip them to design, debug, and distribute fully functional and sustainable IoT nodes.
关键词： internet of things,test platform,system on chip,embedded systems,photovoltaic,energy harvesting,veri?cation
更新于2025-09-10 09:29:36
-
Extraction and verification of the small-signal model for InP DHBTs in the 0.2–325 GHz frequency range
摘要： This study presents the extraction and veri?cation of a small-signal model suitable for characterizing THz InP double heterojunction bipolar transistors (DHBTs). The π-type topology is adopted in the intrinsic model. Capacitances Ccx and Cce are used to characterize the capacitive parasitics caused by the routing line connecting the collector terminal, base terminal and emitter terminal, respectively. The inductive parasitics introduced by the routing line are also considered. The initial values of the model parameters are extracted using a direct extraction method. The model and extraction method for the model parameters are veri?ed by adopting an InP DHBT with 1 emitter ?nger and an emitter size of 0.5 μm × 5 μm. The simulation results correspond with the measured results in the frequency range from 200 MHz to 325 GHz.
关键词： InP DHBTs,veri?cation,small-signal model,extraction
更新于2025-09-09 09:28:46
-
Latency in Verifying Connection Setup in Dynamic Optical Networks
摘要： We consider dynamic applications that require new connections to be established with very low setup times. One challenge is determining when to initiate transmission, which can be based on a timing mechanism or based on receiving positive acknowledgement that the connection has been properly established. We investigate the latter strategy and analyze the added latency that is imposed by requiring veri?cation of a newly established path. We show that with a distributed connection-setup architecture, veri?cation potentially adds a negligible amount of latency, whereas with centralized operation, the added latency can be appreciable, especially in a backbone network.
关键词： PCE,connection setup,dynamic networks,distributed,path veri?cation,Centralized,latency,RSVP-TE
更新于2025-09-09 09:28:46
-
Numerical Simulation of Focused Wave and Its Uncertainty Analysis
摘要： On the basis of the transient water wave (TWW) theory, focused wave is generated in the circulating water channel. Numerical simulation of the focused wave is carried out by solving the Reynolds averaged Navier-Stokes (RANS) equations. The dynamic grid technique is adopted to simulate the motion of the wave maker, and the volume of ?uid (VOF) method is used to capture the free surface of the wave. The simulation results are compared with the measured data, and good agreement is obtained. For quantitative estimation of the numerical simulation error and uncertainty, the uncertainty analysis method recommended by the International Towing Tank Conference (ITTC) procedure is performed for the simulation results of the surface elevations at di?erent positions. Both grid-convergence and time-step-size convergence studies are conducted using three types of grids and time step sizes. The simulation results are all monotonously convergent in the veri?cation procedure, and the validations of the simulated surface elevations with the positions at 3.5, 4.0 and 4.5 m are all achieved by comparing with the validation uncertainty. It is found that the numerical simulation errors caused by the grid and time-step-size in the convergence studies have the same order of magnitude. In addition, the numerical errors and uncertainties for the surface elevations at di?erent positions are compared and discussed in detail. This paper presents the ?rst attempt to carry out the uncertainty analysis of the simulation of focused wave, and the e?ectiveness of the proposed veri?cation and validation procedures in the uncertainty analysis is demonstrated.
关键词： Reynolds averaged Navier-Stokes (RANS) equations,validation,uncertainty analysis,veri?cation,focused wave
更新于2025-09-04 15:30:14