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IEEE Aerospace and Electronic Systems Magazine

Issue 2 • Date Feb. 1991

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Displaying Results 1 - 5 of 5
  • Advanced concepts for launch vehicle control

    Publication Year: 1991, Page(s):23 - 29
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (663 KB)

    The objective of the advanced launch system (ALS) program is to develop a family of launch vehicles which provides a substantial improvement in reliability, operability, and economy over existing systems. This requires that autopilot design and verification procedures be of minimum sensitivity to recurring costs while providing adequate, but not necessarily optimal, vehicle performance. One approa... View full abstract»

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  • Transfer orbit stage gyrocompass alignment algorithm twist and sway environment for Mar's Observer mission on commercial Titan

    Publication Year: 1991, Page(s):3 - 7
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (395 KB)

    The problems presented by the launch of a booster vehicle with a strapdown system on an expandable launch vehicle are addressed. These include the Earth motion by the wind-induced twist and sway motion at the launch pad, vibration-induced motion, and various sensor errors, as well as the limited memory and processing power of the flight computer. A robust numeric gyrocompass alignment algorithm is... View full abstract»

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  • Curved path approaches and dynamic interpolation

    Publication Year: 1991, Page(s):8 - 13
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (490 KB)

    It is shown that to simplify the specification of a desired trajectory for some subset of the variables of a dynamic control system, it may be advantageous to designate a set of intercept points that the trajectory is required to pass through. The system controls can then be computed in terms of a spline function to meet these requirements for dynamic interpolation. Optimization of a cost function... View full abstract»

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  • Target motion compensation in synthetic aperture radar

    Publication Year: 1991, Page(s):14 - 18
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    In a synthetic aperture radar (SAR) targets on the ground that are moving become smeared as a result of velocity components parallel to the motion of the radar and are moved to radically different angular positions if they have velocity components perpendicular to the motion of the radar. Methods for restoring moving targets to their correct size and position are described. The samples collected f... View full abstract»

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  • Coherent Doppler tomography-a technique for narrow band SAR

    Publication Year: 1991, Page(s):19 - 22
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (357 KB)

    Some concerns regarding a technique of narrowband synthetic aperture radar (N-SAR) imaging called coherent Doppler tomography (CDT), which may be a good candidate for spaceborne applications, are addressed. Using a single-frequency signal, are addressed. Using a single-frequency signal, resolution of two tenths of a wavelength can be achieved in the point spread function if the radar platform circ... View full abstract»

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Aims & Scope

IEEE Aerospace and Electronic Systems Magazine is a monthly magazine that publishes articles concerned with the various aspects of systems for space, air, ocean, or ground environments as well as news and information of interest to IEEE Aerospace and Electronic Systems Society members.

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Meet Our Editors

Editor-in-Chief
Maria Sabrina Greco
Dept. of Information Engineering
University of Pisa
Via G.Caruso 16
56122 Pisa, Italy
Ph: +39 050 2217620
m.greco@ieee.org