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Aerospace and Electronic Systems Magazine, IEEE

Issue 3  Part 1 • Date March 1990

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Displaying Results 1 - 3 of 3
  • Space power alternatives for laser radar sensor system

    Publication Year: 1990 , Page(s): 3 - 8
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (441 KB)  

    Seven candidate power systems for the sensor of a space-based laser radar system are identified, and their performance and operating characteristics are briefly described. The systems are the NiCd battery, NiH/sub 2/ battery, NaS battery, LiSO/sub 2/-Cl/sub 2/ battery, LiAl-FeS/sub 2/ battery, H/sub 2//O/sub 2/ fuel cell, and an inertial flywheel generator. The systems encompass a current or projected specific energy range of from 15.0 to 100 Wh/lb. To arrive at a meaningful basis for comparison and to aid in system selection, a figure-of-merit (FOM) was established. Because the FOM is somewhat qualitative in content, scoring weighting factors were utilized to further quantify the results. The NiH/sub 2/ battery and the NaS battery received the highest FOM rankings. Following next in order were the H/sub 2//O/sub 2/ fuel cell and the inertial flywheel generator. The NiCd and lithium thermal batteries received the lowest ratings. These results are of a preliminary nature. Extension of these analyses to include reliability and cost factors is recommended.<> View full abstract»

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  • Autonomous land navigation in a structured environment

    Publication Year: 1990 , Page(s): 9 - 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (298 KB)  

    A hardware system and software developed to perform autonomous navigation of a land vehicle in a structured environment is described. The vehicle used for development and testing of the system was the Jeep Cherokee Mobile Robotics Testbed Vehicle. Since obstacle detection and avoidance have not yet been incorporated into the system, a structured environment is postulated that presumes that the paths to be traversed are free of obstacles. The system performs path planning and execution based on maps constructed using the vehicle's onboard navigation system and mapmaker. The system software, hardware, and performance data are discussed.<> View full abstract»

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  • Neural networks perspectives and potentials

    Publication Year: 1990 , Page(s): 13 - 17
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (454 KB)  

    The evolution of machine-based signal processing exploits the controllable complexity properties of the available physical vehicles. Contemporary integrated electronic device-array complexity appears to have reached the critical size where the functional behavior of some bioneural array networks can be emulated directly. Such nonnumeric analog token model methods were in common use before the digital computer era. Beyond a revitalization and broadening of analog model and circuit knowledge, the present neural network flurry may result in human-sense-like circuit functions of designable levels of sophistication where the analog feature complexity approaches that of the real thing. Candidates for eased-in growth are application-specific integrated circuits, where one can combine and evolve the inherent strength of analog and digital design methods. Technology deployment appears so far to be nonrevolutionary and well within the existing and diverse analog circuit capabilities.<> View full abstract»

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Aims & Scope

The IEEE Aerospace and Electronic Systems Magazine publishes articles and tutorials concerned with the various aspects of systems for space, air, ocean, or ground environments.

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Editor-in-Chief
Teresa Pace, PhD EE
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