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  • 1
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    Telemetry system (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The means of telemetering digital data from a spacecraft to the Deep Space Network is addressed. Phase shift keying and uncoded quadriphase shift keying modulations are discussed along with demodulation and decoding systems. Telemetry system losses and noisy reference performance for suppressed carrier receivers are also examined.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: Deep Space Telecommun. Systems Eng.; p 179-341
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The effect of noisy carrier reference on telemetry with baseband arraying (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Imperfect carrier reference causes a degradation in detection performance in coherent communication systems. A measure of this degradation is the radio loss, which is the amount of increase in data signal to noise ratio (SNR) per bit required to achieve the same bit error rate when carrier reference is perfect. Performance analysis and numerical results are obtained for the Voyager high rate telemetry link with maximum likelihood convolutional decoding. The arraying of antennas provides not only improved performance due to an increase in effective antenna aperture, but also a decrease in radio loss with respect to a single antenna. This telemetry link performance improvement is a function of the carrier loop SNR and data bit error rate. When the carrier loop SNR's are low, it provides a significant improvement in the telemetry link performance since the decrease in radio loss with respect to a single station is substantial.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Telecommun. and Data Acquisition Rept.; p 128-135
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Modulation and coding technology for deep space and satellite applications (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Modulation and coding research and development at the Jet Propulsion Laboratory (JPL) currently emphasize Deep Space Communications Systems and advanced near earth Commercial Satellite Communications Systems. The Deep Space Communication channel is extremely signal to noise ratio limited and has long transmission delay. The near earth satellite channel is bandwidth limited with fading and multipath. Recent code search efforts at JPL have found a long constraint, low rate convolutional code (15, 1/6) which, when concatenated with a ten bit Reed-Solomon (RS) code, provides a 2.1 dB gain over that of the Voyager spacecraft - the current standard. The new code is only 2 dB from the theoretical Shannon limit. A flight qualified version of the (15, 1/6) convolutional encoder was implemented on the Galileo Spacecraft to be launched later this year. An L-band mobile link, use of the Ka-band for personal communications, and the development of subsystem technology for the interconnection of satellite resources by using high rate optical inter-satellite links are noted.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: NASA. Lewis Research Center, Advanced Modulation and Coding Technology Conference; p 245-256
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Deep space telecommunication systems engineering (1983)
    In:  Other Sources
    Details
    Publication Date: 2016-03-09
    Description: Descriptive and analytical information useful for the optimal design, specification, and performance evaluation of deep space telecommunications systems is presented. Telemetry, tracking, and command systems, receiver design, spacecraft antennas, frequency selection, interference, and modulation techniques are addressed. Previously announced in STAR as N83-22226
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Telecommunications technology development for the Deep Space Network (1989)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The telecommunications technology that is currently being developed for the Deep Space Network (DSN), a system providing communications and navigation support for NASA's deep space missions, is discussed. The major areas of development include Ka-band (32 GHz) technology, beam waveguide antennas, low-noise amplifiers, coding, navigation techniques, high-power transmitters, and optical technology. The expected payoffs of the new technology during the mid-1990's and later are examined.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: IAF PAPER 89-502
    Format: text
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  • 6
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    Performance of convolutionally coded unbalanced QPSK systems (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An evaluation is presented of the performance of three representative convolutionally coded unbalanced quadri-phase-shift-keying (UQPSK) systems in the presence of noisy carrier reference and crosstalk. The use of a coded UQPSK system for transmitting two telemetry data streams with different rates and different powers has been proposed for the Venus Orbiting Imaging Radar mission. Analytical expressions for bit error rates in the presence of a noisy carrier phase reference are derived for three representative cases: (1) I and Q channels are coded independently; (2) I channel is coded, Q channel is uncoded; and (3) I and Q channels are coded by a common 1/2 code. For rate 1/2 convolutional codes, QPSK modulation can be used to reduce the bandwidth requirement.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: In: NTC ''80; National Telecommunications Conference; Nov 30, 1980 - Dec 04, 1980; Houston, TX
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    NASA TECHNICAL REPORTS
  • 7
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    A statistical model for telecommunication link design (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An evaluation is conducted of the current telecommunication link design technique and a description is presented of an alternative method, called the probability distribution method (PDM), which is free of the disadvantages of the current technique while retaining its advantages. The PDM preserves the simplicity of the design control table (DCT) format. The use of the DCT as a management design control tool is continued. The telecommunication link margin probability density function used presents the probability of achieving any particular value of link performance. It is, therefore, possible to assess the performance risk and other tradeoffs.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: National Telecommunications Conference; Dec 01, 1975 - Dec 03, 1975; New Orleans, LA
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    A coupled phase-locked loops system for carrier tracking improvement (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A system that couples several phase-locked loops to improve carrier tracking performance is considered. It coherently combines the received carrier signals at geographically separated ground antennas to increase the total effective aperture. The received carrier's phases are automatically aligned to enhance the received carrier signal-to-noise ratio. The system's tracking performance is assessed in terms of rms phase jitter. It is shown that the phase-locked loop in the first receiver, where the carrier arraying is performed, tracks the received carrier phase using the received carrier power from all receivers.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: ICC ''82 - The digital revolution; International Conference on Communications; Jun 13, 1982 - Jun 17, 1982; Philadelphia, PA
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Cascaded coherent tracking systems with time-varying channels (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A performance analysis is presented of a two-way coherent tracking system (of the type used for spacecraft tracking and navigation) in which the transmitted signals have pass through linear time-varying channels. The performance of the system is characterized by the steady state probability density function of the reduced phase error process in the second tracking loop, the system considered consisting of two first-order phase locked loops in cascade. While the log normal channel, which arises in communication through planetary atmospheres, was used as the channel model, the results can be extended to other channels, such as the Rice and Rayleigh channels.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: International Telemetering Conference; Sep 28, 1976 - Sep 30, 1976; Los Angeles, CA
    Format: text
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