41,581 to 41,590 of 42,325 Results
Jun 16, 1993
Divsalar, Dariush; Simon, Marvin K., 1993, "Pseudo-Coherent Demodulation for Mobile Satellite Systems", https://hdl.handle.net/2014/35304, Pasadena, California, USA, JPL Open Repository
This paper proposes three so-called pseudo-coherent demodulation schemes for use in land mobile satellite channels. The schemes are derived based on maximum-likelihood (ML) estimation and detection of an N-symbol observation of the received signal. |
Jun 16, 1993
Abbe, B.; Jedrey, T.; Estabrook, P.; Agan, M., 1993, "ACTS Broadband Aeronautical Experiment", https://hdl.handle.net/2014/35073, Pasadena, California, USA, JPL Open Repository
This paper describes how K/Ka-band mobile satellite technology could be useful in meeting increased demands for aeronautical mobile satellite communication services. |
Jun 16, 1993
Tulintseff, A.; Crist, R.; Densmore, A.; Sukamto, L., 1993, "An Active K/K-Band Antenna Array for the NASA ACTS Mobile Terminal", https://hdl.handle.net/2014/35066, Pasadena, California, USA, JPL Open Repository
An active K/K-band antenna array is currently under develoment for NASA's ACTS Mobile Terminal (AMT). The AMT task will demonstrate voice, data, and video communications to and from the AMT vehicle in Los Angeles, California, and a base station in Cleveland, Ohio, via the ACTS sa... |
Jun 15, 1993
Matthies, Larry; Grandjean, Pierrick, 1993, "Stochastic Performance Modeling and Evaluation of Obstacle Detectability With Imaging Range Sensors", https://hdl.handle.net/2014/35395, New York, New York, USA, JPL Open Repository
In this paper, we address this issue for imaging range sensors by dividing the evaluation problem into two levels: quality of the range data itself and quality of the obstacle detection algorithms applied to the range data. |
Jun 15, 1993
Golshan, N., 1993, "Propagation Issues for Emerging Mobile and Portable Communications, a Systems Perspective", https://hdl.handle.net/2014/35603, Pasadena, California, USA, JPL Open Repository
This paper presents the viewpoint of a system engineer regarding the format of propagation information and models suitable for the design of mobile and portable satellite communications systems for the following services: audio broadcast, two way voice, and packet data. |
Jun 15, 1993
Davarian, F.; Bishop, D., 1993, "Contribution Towards a Draft Revision of Recommendation 681 Propogation Data Required for the Design of Earth-Space Land Mobile Telecommunications Systems", https://hdl.handle.net/2014/35602, PAsadena, California, USA, JPL Open Repository
Propogation models that can be used for the design of Earth-space land mobile-satellite telecommunications systems are presented. These models include: empirical roadside shadowing, attenuation frequency scaling, fade and non-fade duration distribution, multipath in a mountain en... |
Jun 14, 1993
Hanner, M.; Lynch, D.; Russell, R., 1993, "10 mum Spectra of Comets and the Composition of Silicate Grains", https://hdl.handle.net/2014/35027, Belgirate, Italy, JPL Open Repository
No abstract provided |
Jun 14, 1993
Weissman, P.R.; Carlson, R.W.; Smythe, W.D.; Byrne, L.C.; Ocampo, A.C.; Kamp, L.; Kieffer, H.H.; Soderblom, L.A.; Fanale, F.P.; Granahan, J.C.; McCord, T.B., 1993, "(abstract) Galileo NIMS Thermal Observations of Asteroid 951 Gaspra", https://hdl.handle.net/2014/35178, Belgirate, Italy, JPL Open Repository
The Near Infrared Mapping Spectrometer (NIMS) onboard the Galileo spacecraft performed spectral and thermal imaging of asteroid 951 Gaspra during the spacecraft flyby on October 29, 1991. Measurements of the hemispherically averaged temperature on Gaspra as the spacecraft approac... |
Jun 14, 1993
Febvre, P.; McGrath, W.; Leduc, H.; Batelaan, P.; Frerking, M.; Hernichel, J.; Bumble, B., 1993, "A 547 GHz SIS Receiver Employing a Submicron Nb Junction with an Integrated Matching Circuit", https://hdl.handle.net/2014/35080, ['IEEE, Microwave Theory and Techniques', 'Atlanta, Georgia, USA'], JPL Open Repository
The most sensitive heterodyne receivers used for millimeter wave and submillimeter wave radioastronomy employ superconductor-insulator-superconductor (SIS) tunnel junctions as the nonlinear mixing element. |
Jun 14, 1993
Cha, A.G., 1993, "A Plan for Acquiring Propagation Data from ACT Communications Experiments", https://hdl.handle.net/2014/35604, Pasadena, California, USA, JPL Open Repository
No abstract provided |