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  • 1
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    Beyond the Ionosphere: Fifty Years of Satellite Communication (1997)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The three overlapping stages of satellite communications development outlined provide the three-part framework for the organization of the papers contained in this book. Part 1, 'Passive Origins,' treats the first stage of satellite communications development, extending from the 1940s into the early 1960s, when passive artificial and natural satellites funded by the military and private enterprise established the field. Part 2, 'Creating the Global, Regional, and National Systems,' addresses events that constituted the second stage of development. Early in this stage, which stretched from the 1960s into the 1970s, satellite systems began to make their appearance in the United States, while domestic and international efforts sought to bring order to this new but chaotic, field in the form of Comsat and Intelsat. Part 3, 'The Unfolding of the World System,' explores the development of satellite communications in the remainder of the world, with a strong emphasis on Asia.
    Keywords: Communications and Radar
    Type: NASA-SP-4217 , NAS 1.21:4217
    Format: application/pdf
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  • 2
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    Bistatic and Multistatic Radar: Surveillance, Countermeasures, and Radar Cross Sections. (Latest citations from the Aerospace Database) (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The bibliography contains citations concerning the design, development, testing, and evaluation of bistatic and multistatic radar used in surveillance and countermeasure technology. Citations discuss radar cross sections, target recognition and characteristics, ghost recognition, motion image compensation, and wavelet analysis. Stealth aircraft design, stealth target tracking, synthetic aperture radar, and space applications are examined.
    Keywords: Communications and Radar
    Type: PB98-852924
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Bistatic and Multistatic Radar: Surveillance, Countermeasures, and Radar Cross Sections. (Latest Citations from the Aerospace Database) (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The bibliography contains citations concerning the design, development, testing, and evaluation of bistatic and multistatic radar used in surveillance and countermeasure technology. Citations discuss radar cross sections, target recognition and characteristics, ghost recognition, motion image compensation, and wavelet analysis. Stealth aircraft design, stealth target tracking, synthetic aperture radar, and space applications are examined.
    Keywords: Communications and Radar
    Type: PB97-854103
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The Clementine Bistatic Radar Experiment (1996)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: During the Clementine 1 mission, a bistatic radar experiment measured the magnitude and polarization of the radar echo versus bistatic angle, beta, for selected lunar areas. Observations of the lunar south pole yield a same-sense polarization enhancement around beta = 0. Analysis shows that the observed enhancement is localized to the permanently shadowed regions of the lunar south pole. Radar observations of periodically solar-illuminated lunar surfaces, including the north pole, yielded no such enhancement. A probable explanation for these differences is the presence of low-loss volume scatterers, such as water ice, in the permanently shadowed region at the south pole.
    Keywords: Communications and Radar
    Type: NASA-CR-204693 , NAS 1.26:204693 , Science; 274; 1495-1498
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Satellite antenna management system and method (1999)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The antenna management system and method allow a satellite to communicate with a ground station either directly or by an intermediary of a second satellite, thus permitting communication even when the satellite is not within range of the ground station. The system and method employ five major software components, which are the control and initialization module, the command and telemetry handler module, the contact schedule processor module, the contact state machining module, and the telemetry state machine module. The control and initialization module initializes the system and operates the main control cycle, in which the other modules are called. The command and telemetry handler module handles communication to and from the ground station. The contact scheduler processor module handles the contact entry schedules to allow scheduling of contacts with the second satellite. The contact and telemetry state machine modules handle the various states of the satellite in beginning, maintaining and ending contact with the second satellite and in beginning, maintaining and ending communication with the satellite.
    Keywords: Communications and Radar
    Format: application/pdf
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  • 6
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    Magnetic antenna using metallic glass (1996)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A lightweight search-coil antenna or sensor assembly for detecting magnetic fields and including a multi-turn electromagnetic induction coil wound on a spool type coil form through which is inserted an elongated coil loading member comprised of metallic glass material wrapped around a dielectric rod. The dielectric rod consists of a plastic or a wooden dowel having a length which is relatively larger than its thickness so as to provide a large length-to-diameter ratio. A tri-axial configuration includes a housing in which is located three substantially identical mutually orthogonal electromagnetic induction coil assemblies of the type described above wherein each of the assemblies include an electromagnetic coil wound on a dielectric spool with an elongated metallic glass coil loading member projecting therethrough.
    Keywords: Communications and Radar
    Format: application/pdf
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  • 7
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    Method and apparatus for determining position using global positioning satellites (1998)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A global positioning satellite receiver having an antenna for receiving a L1 signal from a satellite. The L1 signal is processed by a preamplifier stage including a band pass filter and a low noise amplifier and output as a radio frequency (RF) signal. A mixer receives and de-spreads the RF signal in response to a pseudo-random noise code, i.e., Gold code, generated by an internal pseudo-random noise code generator. A microprocessor enters a code tracking loop, such that during the code tracking loop, it addresses the pseudo-random code generator to cause the pseudo-random code generator to sequentially output pseudo-random codes corresponding to satellite codes used to spread the L1 signal, until correlation occurs. When an output of the mixer is indicative of the occurrence of correlation between the RF signal and the generated pseudo-random codes, the microprocessor enters an operational state which slows the receiver code sequence to stay locked with the satellite code sequence. The output of the mixer is provided to a detector which, in turn, controls certain routines of the microprocessor. The microprocessor will output pseudo range information according to an interrupt routine in response detection of correlation. The pseudo range information is to be telemetered to a ground station which determines the position of the global positioning satellite receiver.
    Keywords: Communications and Radar
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Mobile satellite service communications tests using a NASA satellite (1995)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Emerging applications of commercial mobile satellite communications include satellite delivery of compact disc (CD) quality radio to car drivers who can select their favorite programming as they drive any distance; transmission of current air traffic data to aircraft; and handheld communication of data and images from any remote corner of the world. Experiments with the enabling technologies and tests and demonstrations of these concepts are being conducted before the first satellite is launched by utilizing an existing NASA spacecraft.
    Keywords: Communications and Radar
    Type: Proceedings of the Fourth International Mobile Satellite Conference (IMSC 1995); 164-169; NASA-CR-199955
    Format: text
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  • 9
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    Picture data compression coder using subband/transform coding with a Lempel-Ziv-based coder (1995)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Digital data coders/decoders are used extensively in video transmission. A digitally encoded video signal is separated into subbands. Separating the video into subbands allows transmission at low data rates. Once the data is separated into these subbands it can be coded and then decoded by statistical coders such as the Lempel-Ziv based coder.
    Keywords: Communications and Radar
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  • 10
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    Apparatus and method for measuring relative phase of signals in a multiple-echo system (1998)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: An apparatus and method for measuring the relative phase of echo signals in a multiple-echo system. A signal generator generates an exciting tone burst and subsequent tone bursts delayed in phase from the exciting tone burst. The exciting tone burst is gated into a transducer coupled to the multiple-echo system. Each subsequent tone burst is converted into a series of pulses. Each pulse triggers a sample/hold circuit to sample each echo signal. The samples of the echo signal are averaged and then compared to a reference value. The signal generator is controlled to vary the subsequent tone burst phase delay to determine for each echo signal a subsequent tone burst phase delay that causes the average of the samples of the echo signal to be substantially equal to the reference value wherein the determined subsequent tone burst phase delay is the phase delay of the echo signal with respect to the exciting tone burst. The control circuit then determines the difference in phase delay between echo signals to determine the relative phase delay of the echo signals.
    Keywords: Communications and Radar
    Format: application/pdf
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