Virtual Photon-Photon Annihilation and Pion Mass Difference
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Yan, T.↗
Engineering topics
Yan, T.
Publications and source records attributed to Yan, T..
Return to Europa: Overview of the Jupiter Europa Orbiter Mission
Missions to explore Europa have been imagined ever since the Voyager mission first suggested that Europa was geologically very young. Subsequently, Galileo supplied fascinating new insights into that satellite's secrets. The Jupiter Europa Orbiter (JEO) would be the NASA-led portion of the Europa Jupiter System Mission (EJSM), an international mission with orbiters developed by NASA, ESA and possibly JAXA. JEO would address a very important subset of the complete EJSM science objectives and is designed to function alone or in conjunction with ESA's Jupiter Ganymede Orbiter (JGO).
radiation↗
Considerations on communications network protocols in deep space
Communications supporting deep space missions impose numerous unique constraints that impact the architectural choices made for cost-effectiveness. We are entering the era where networks that exist in deep space are needed to support planetary exploration. Cost-effective performance will require a balanced integration of applicable widely used standard protocols with new and innovative designs.
network protocols deep space wireless networks↗
Earth beacon acquisition and tracking under various illumination conditions
This paper develops an algorithm for determining the geocenter of the Earth regardless of the illumination by the sun using sub-pixel scanning and a simple thresholding technique. To complete this approach the acquisition algorithm is paired with a tracking technique based on maximum likelihood estimation.
beacon↗
An Off-line Coherent FQPSK-B Software Reference Receiver
Using Feher patented Quadrature Phase Shift Keying provides improved spectrum efficiency for high rate telemetry systems.
FQPSK-B Software Receiver Bandwidth Efficient Modu↗
A Robust Spatial Acquisition Algorithm for Extended Source using Subpixel Image Scanning
We present a new spatial acquisition algorithm using subpixel image scanning.
spatial acquisition subpixel image scanning extend↗
The Extended-Image Tracking Technique Based on the Maxium Likelihood Estimation
This paper describes an extended-image tracking technique based on the maximum likelihood estimation.
Estimation Optical communications↗
System Requirements for a Deep Space Optical Transceiver
The functional requirements and design drivers for an Optical Communications subsystem are assessed based on the system requirements imposed by a proposed Europa Orbiter mission.
optical↗
Acquisition Performance Comparision of the Generalized Maximum A Posteriori Symbol Synchronizer Versus the Data-Transistion Tracking Loop
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DTTL Data-transistion tracking loop Acquisition Pe↗
A Robust Spatial Acquisition Algorithm for Extended Source Using Subpixel Image Scanning
Extended source spatial acquisition is a critical technology for deep space optical communications.
Subpixel Image Scanning Robust Spatial Acquisition↗
T-PPM: A Novel Modulation Scheme for Optical Communications Impaired by Pulsewidth Inaccuracies
This paper presents the analysis of a trellis-based pulse position modulation (T-PPM) scheme for photon communications with non-rectangular pulses.
optical pulse position modulation (PPM) trellis-ba↗
Optimum design of hybrid phase locked loops
The design procedure of phase locked loops is described in which the analog loop filter is replaced by a digital computer. Specific design curves are given for the step and ramp input changes in phase. It is shown that the designed digital filter depends explicitly on the product of the sampling time and the noise bandwidth of the phase locked loop. This technique of optimization can be applied to the design of digital analog loops for other applications.
Lee, P.↗