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174 results on '"Linscott I"'

58. Bunch-by-bunch longitudinal feedback system for PEP-II

Author

Oxoby, G, Corlett, J, Claus, R, Fox, J, Hindi, H A, Höflich, J, Linscott, I, Olsen, J, Perbhakar, S, Sapozhnikov, L F, Lamberson, G, Drago, A, and Serio, M

Subjects
Accelerators and Storage Rings
Published
1994

59. VLSI processors for signal detection in SETI

Author

Duluk, J. F, Linscott, I. R, Peterson, A. M, Burr, J, Ekroot, B, and Twicken, J

Subjects
Exobiology
Abstract

The objective of the Search for Extraterrestrial Intelligence (SETI) is to locate an artificially created signal coming from a distant star. This is done in two steps: (1) spectral analysis of an incoming radio frequency band, and (2) pattern detection for narrow-band signals. Both steps are computationally expensive and require the development of specially designed computer architectures. To reduce the size and cost of the SETI signal detection machine, two custom VLSI chips are under development. The first chip, the SETI DSP Engine, is used in the spectrum analyzer and is specially designed to compute Discrete Fourier Transforms (DFTs). It is a high-speed arithmetic processor that has two adders, one multiplier-accumulator, and three four-port memories. The second chip is a new type of Content-Addressable Memory. It is the heart of an associative processor that is used for pattern detection. Both chips incorporate many innovative circuits and architectural features.

Published
1989
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60. Ultranarrowband searches for extraterrestrial intelligence with dedicated signal-processing hardware

Author

Horowitz, P, Matthews, B. S, Forster, J, Linscott, I, Teague, C. C, Chen, K, and Backus, P

Subjects
Space Sciences (General)
Abstract

An evaluation is made of the prospects for SETI applications of multichannel spectroscopy, assuming narrowband RF beacon transmission, with a mHz resolution that matches interstellar medium properties. Receiver Doppler corrections must furnish substantial interference rejection. Results are presented from an Arecibo antenna search of 250 sunlike stars at 1.4 and 2.8 GHz. A meridian transit search of the northern sky is also in progress with the Harvard-Smithsonian 26-m antenna.

Published
1986
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61. Stanford Hardware Development Program

Author

Peterson, A, Linscott, I, and Burr, J

Subjects
Space Biology
Abstract

Architectures for high performance, digital signal processing, particularly for high resolution, wide band spectrum analysis were developed. These developments are intended to provide instrumentation for NASA's Search for Extraterrestrial Intelligence (SETI) program. The real time signal processing is both formal and experimental. The efficient organization and optimal scheduling of signal processing algorithms were investigated. The work is complemented by efforts in processor architecture design and implementation. A high resolution, multichannel spectrometer that incorporates special purpose microcoded signal processors is being tested. A general purpose signal processor for the data from the multichannel spectrometer was designed to function as the processing element in a highly concurrent machine. The processor performance required for the spectrometer is in the range of 1000 to 10,000 million instructions per second (MIPS). Multiple node processor configurations, where each node performs at 100 MIPS, are sought. The nodes are microprogrammable and are interconnected through a network with high bandwidth for neighboring nodes, and medium bandwidth for nodes at larger distance. The implementation of both the current mutlichannel spectrometer and the signal processor as Very Large Scale Integration CMOS chip sets was commenced.

Published
1986

62. Signal processing in SETI

Author

Cullers, D. K, Linscott, I. R, and Oliver, B. M

Subjects
Communications And Radar
Abstract

It is believed that the Galaxy might contain ten billion potential life sites. In view of the physical inaccessibility of extraterrestrial life on account of the vast distances involved, a logical first step in a search for extraterrestrial intelligence (SETI) appears to be an attempt to detect signals already being radiated. The characteristics of the signals to be expected are discussed together with the search strategy of a NASA program. It is pointed out that all presently planned searches will use existing radio-astronomy antennas. If no extraterrestrial intelligence signals are discovered, society will have to decide whether SETI justifies a dedicated facility of much greater collecting area. Attention is given to a multichannel spectrum analyzer, CW signal detection, pulse detection, the pattern detector, and details of SETI system operation.

Published
1985

68. Beam diagnostics based on time-domain bunch-by-bunch data

Author

Teytelman, D., primary, Fox, J., additional, Hindi, H., additional, Limborg, C., additional, Linscott, I., additional, Prabhakar, S., additional, Sebek, J., additional, Young, A., additional, Drago, A., additional, Serio, M., additional, Bȧrry, W., additional, and Stover, G., additional

Published
1998
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76. An Image Frequency Rejection Filter for SAW-Less GPS Receivers.

Author

Barth, C., Linscott, I. R., and Inan, U. S.

Subjects
*GPS receivers, *GLOBAL Positioning System, *RADIOS, *TRANSFER functions, *CONTROL theory (Engineering)
Abstract

We have developed an on-chip RF filter in 130 nm BiCMOS for SAW-less GPS receivers. The filter is implemented as a cascode amplifier stage with reactive resonant tanks. The filter employs two Q-enhanced LC tanks to create a transfer function with steep roll-off characteristic and narrow passband. The image rejection filter achieves a 3 dB bandwidth of less than 12 MHz at the GPS L1 center frequency of 1575.42 MHz. The resulting magnitude response exhibits a notch at 1540 MHz and at 1610 MHz, attenuating noise and interference 30 MHz away from the center frequency by more than 30 dB. The NF of the RF filter is 4.0 dB. A competitive power consumption of only 5.7 mW is achieved. [ABSTRACT FROM PUBLISHER]

Published
2012
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77. PLUTO'S HYPERVOLATILE SURFACE ICES SOURCED FROM KBO AMORPHOUS WATER ICE COMPOSITES.

Author

Lisse, C. M., Young, L. A., Cruikshank, D. P., Stern, S. A., Keane, J. T., Umurhan, O. M., Gladstone, G. R., Parker, J. W., Binzel, R. P., Earle, A. M., Pendleton, Y. J., Sandford, S. A., Horanyi, M., Weaver, H. A., Cheng, A. F., McNutt, R. L., El-Maarry, M., Moore, J. M., Linscott, I., and Schmitt, B.

Subjects
PLUTO (Dwarf planet), COMETS, ICE, SOLAR spectra, EARTH (Planet), WATER, KUIPER belt
Published
2019

78. RADIO SCIENCE EXPERIMENT (REX) ON NEW HORIZONS: RESULTS FROM THE PLUTO FLYBY.

Author

Bird, M. K., Linscott, I. R., Hinson, D. P., Tyler, G. L., Strobel, D. F., Pätzold, M., Summers, Hahn, M., Andert, T. P., Stern, S. A., Weaver, H. A., Young, L. A., Ennico, K., Gladstone, G. R., Olkin, C. B., Moore, J. M., Grundy, W. M., DeBoy, C. C., and Vincent, M.

Subjects
PLUTO (Dwarf planet), SCIENTIFIC experimentation, HORIZON, RADIOS, IONOSPHERE, METHANE hydrates, BISTATIC radar
Published
2019

79. Haze and Cosmic Ray Influences on Pluto's Compositional Environments.

Author

Grundy, W. M., Binzel, R. P., Buie, M. W., Cheng, A. F., Cook, J. C., Cruikshank, D. P., Ore, C. M. Dalle, Earle, A. M., Ennico, K., Jennings, D. E., Howett, C. J. A., Linscott, I. E., Lunsford, A. W., McKinnon, W. B., Olkin, C. B., Parker, A. H., Protopapa, S., Reuter, D. C., Singer, K. N., and Spencer, J. R.

Subjects
PLUTO (Dwarf planet), COSMIC rays, DWARF planets
Published
2017

80. GEOLOGIC MAP OF NEW HORIZONS' ENCOUNTER HEMISPHERE OF CHARON, III.

Author

Robbins, S. J., Spencer, J. R., Beyer, R. A., Schenk, P., Moore, J. M., McKinnon, W. B., Binzel, R. P., Buie, M. W., Buratti, B. J., Cheng, A. F., Grundy, W. M., Linscott, I. R., Reitsema, H. J., Reuter, D. C., Showalter, M. R., Tyler, G. L., Young, L. A., Olkin, C. B., Ennico, K., and Weaver, H. A.

Subjects
EARTH (Planet), GEOLOGICAL mapping, CARTOGRAPHY, GEOLOGICAL maps, EARTH sciences, ENVIRONMENTAL sciences, PHYSICAL sciences
Published
2017

85. Acoustic detection of high-energy particle showers

Author

Blackinton, J. G., primary, Bowen, T., additional, Bradner, H., additional, Jones, W. V., additional, Learned, J., additional, Levi, M., additional, Linscott, I., additional, Parvulescu, A., additional, Pifer, B., additional, Polakes, P., additional, Strait, J., additional, and Sulak, L., additional

Published
1977
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86. Measurement of theCP-nonconserving decay,KL0→2π0

Author

Rey, C. A., primary, Cence, R. J., additional, Jones, B. D., additional, Parker, S. I., additional, Peterson, V. Z., additional, Stenger, V. J., additional, Kenney, R. W., additional, Linscott, I. R., additional, and Oliver, W. P., additional

Published
1976
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90. Measurement of the Branching RatioKL0→2π0KL0→3π0

Author

Cence, R. J., primary, Jones, B. D., additional, Peterson, V. Z., additional, Stenger, V. J., additional, Wilson, J., additional, Cheng, D., additional, Eandi, R. D., additional, Kenney, R. W., additional, Linscott, I., additional, Oliver, W. P., additional, Parker, S., additional, and Rey, C., additional

Published
1969
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97. Operation and performance of the PEP-II prototype longitudinal damping system at the ALS

Author

Teytelman, D., primary, Claus, R., additional, Fox, J., additional, Hindi, H., additional, Hoeflich, J., additional, Linscott, I., additional, Olsen, J., additional, Oxoby, G., additional, Prabhakar, S., additional, Ross, W., additional, Sapozhnikov, L., additional, Drago, A., additional, Serio, M., additional, Byrd, J., additional, Corlett, J., additional, and Stover, G., additional

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