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Aerospace Applications Conference, 1992. Digest., 1992 IEEE

Date 2-7 Feb. 1992

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Displaying Results 1 - 12 of 12
  • 1992 IEEE Aerospace applications Conference Digest [Front Cover]

    Publication Year: 1992
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    Freely Available from IEEE
  • High temperature superconductors (HTS) for aerospace applications

    Publication Year: 1992 , Page(s): 1 - 6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (239 KB)  

    The impact of high-temperature superconductor (HTS) technology on future aerospace systems is considered. HTS applications for filters, phase shifters, oscillators, and feeds for phased arrays are discussed. It is felt that the greatest payoff for HTS is in the corporate and Butler feeds and matching networks of phased arrays. Another benefit is the drastic reduction of volume and weight in multip... View full abstract»

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  • A proposed multimodal FM/CW aircraft radar for use during ground operations

    Publication Year: 1992 , Page(s): 7 - 18
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (508 KB)  

    A proposed forward looking, relatively small and inexpensive, multimodal radar is described. The design objective is to determine range, range rate, and bearing to targets at 2-500 m, at operational speeds, and at +or-8.5 degrees either side of boresite. For this open-loop, wide-angle, expanded monopulse-like, FM/CW radar, it is planned to time-share the transmitted power to TE/sub 10/, TE/sub 20/... View full abstract»

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  • Electrically small, mixed modal antenna (MMA) array for aerospace applications

    Publication Year: 1992 , Page(s): 19 - 28
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (423 KB)  

    Based on the modal antenna analysis due to D.M. Grimes (see Physica 20D, p.285-302, 1986) near-field interaction between elements of an antenna ensemble wave used to produce resonant, directed radiation from a small antenna. By previous theory, mixed TE and TM modes are found to be orthogonal and, therefore, a small resonant and/or directional antenna is not possible. The authors recount the analy... View full abstract»

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  • An intermodulation interference source locator (IMISL)

    Publication Year: 1992 , Page(s): 29 - 44
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (467 KB)  

    The design of an intermodulation interference source locator (IMISL) test set that was developed for shipboard use in detecting and locating the sources of intermodulation interference in the frequency range of 20-30 MHz is described. The IMISL uses a dual-conversion superheterodyne receiver with a coherent detector to achieve high instantaneous dynamic range with low spurious signals. The fundame... View full abstract»

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  • Earth-based antenna network tradeoffs for NASA's Space Exploration Initiative (SEI)

    Publication Year: 1992 , Page(s): 45 - 56
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (560 KB)  

    The results of a tradeoff study conducted for selection of the most viable Earth-based antenna network architecture for support of NASA's Space Exploration Initiative (SEI) lunar and Mars missions are summarized. The study addressed the lunar mission support requirements, and examined the performance, operations, and cost tradeoffs of using either the NASA Deep Space Network (DSN) large 34-m anten... View full abstract»

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  • Ka-band feed arrays for spacecraft reflector antennas with limited scan capability-an overview

    Publication Year: 1992 , Page(s): 57 - 66
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (550 KB)  

    The design and breadboard of an active transmitting array at Ka-band frequencies and its application to a reflector antenna system is described. The array is intended as a feed array in a near-field Cassegrain or Gregorian dual-reflector antenna system. It uses tapered slot (Vivaldi) elements in a break architecture. The array has been tested for RF performance. Its performance is acceptable, but ... View full abstract»

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  • Closing the loop with inexpensive microcontrollers

    Publication Year: 1992 , Page(s): 67 - 76
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (629 KB)  

    The feasibility of using a commercially available microcontrollers for time-critical applications that require response times on the order of tens-of-milliseconds is addressed. A common type of positioning system with a desired response time of 60 milliseconds is analyzed with respect to the requirements imposed upon the microcontroller. Various means of digital compensation are compared, and it i... View full abstract»

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  • Signal processor retrofit for air search radar

    Publication Year: 1992 , Page(s): 77 - 85
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (505 KB)  

    An approach for improving the performance of existing air search radars by retrofitting the signal processor while leaving the RF hardware and digital data processor (DDP) essentially unchanged is proposed. By using improved algorithms and computational accuracy, the 1.7-dB reduction in processing losses described by C.S. Miller et al. (1990) can be achieved and an additional 3-dB improvement in s... View full abstract»

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  • Miniature X-band GaAs MMIC analog and bi-phase modulators for spaceborne communications applications

    Publication Year: 1992 , Page(s): 87 - 94
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (354 KB)  

    The design concepts, analyses, and the development of GaAs monolithic microwave integrated circuit (MMIC) linear-phase and digital modulators for the next generation of spaceborne communications systems are summarized. The design approach uses a very compact lumped-element, quadrature hybrid, and MESFET-varactors to provide low-loss and well-controlled phase performance for deep-space transponder ... View full abstract»

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  • Rapid prototyping via automatic software code generation from formal specifications: a case study

    Publication Year: 1992 , Page(s): 95 - 105
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (712 KB)  

    A modeling and prototyping approach for defining system and software requirements and validating them through rapid prototyping is described, and the results of a case study for generating prototype software (representing the total system hardware and software) directly and automatically from the requirements are presented. System/software definitions, which include the requirements and design (ar... View full abstract»

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  • Effect of dust on microwave radiometry

    Publication Year: 1992 , Page(s): 107 - 116
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (347 KB)  

    A description of the atmospheric effects on electromagnetic-wave transmission is obtained by modeling the attenuation due to water vapor, oxygen, rainfall, snow, clouds, and dust. The technique developed for calculating the attenuation due to dust is an extension to that used for calculating the attenuation due to rainfall, and it seems to be valid. Calculation of the attenuation was done at 10 GH... View full abstract»

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