IEEE Transactions on Aerospace and Electronic Systems

Issue 2 • Mar 1988

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Displaying Results 1 - 10 of 10
  • Quadriphase code-a radar pulse compression signal with unique characteristics

    Publication Year: 1988, Page(s):156 - 170
    Cited by:  Papers (27)  |  Patents (30)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1212 KB)

    A description is given of a class of radar signals called quadriphase codes. The quadriphase code described is derived from a prototype biphase code by a biphase-to-quadriphase (BTQ) transformation. These codes feature subpulses with a half-cosine shape and a phase change between the adjacent subpulses restricted to either +90° or -90°. This feature results in the spectrum falloff of 12 dB... View full abstract»

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  • Instrumental variable adaptive array processing

    Publication Year: 1988, Page(s):192 - 202
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (756 KB)

    An instrumental variable (IV) approach is presented for estimating the weights of an adaptive antenna array. Theoretical analysis of the IV method shows that the antenna gain weights are independent of finitely correlated noise, so that unbiased estimation of signal arrival angles is possible. Only matrix inversions are required to compute the weight estimates. In this sense, the IV method provide... View full abstract»

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  • Noise factor of receiving system with arbitrary antenna impedance mismatch

    Publication Year: 1988, Page(s):133 - 140
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (536 KB)

    The system operating noise factor of a receiving system is modeled for arbitrary impedance mismatch of the antenna to the transmission line feeding the receiver. The effect of this mismatch on the noise factors of the transmission line and the receiver is considered. The stochastic nature of the external noise factor is considered. The amount of mismatch that can be tolerated before the internal s... View full abstract»

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  • Control and stabilization of nonlinear uncertain elastic robotic arm

    Publication Year: 1988, Page(s):148 - 155
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (568 KB)

    An approach is presented to the control of an uncertain nonlinear flexible robot arm (PUMA-type) with three rotational joints. The third link is assumed to be elastic. A torquer control law, which is a function of the trajectory error, is derived for controlling the joint angles. The knowledge of the system dynamics is not required for the derivation of the controller. This controller includes a r... View full abstract»

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  • ILS glidescope evaluation of imperfect terrain

    Publication Year: 1988, Page(s):186 - 191
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (488 KB)

    Instrument landing systems (ILS) are normally designed assuming the site around them to be flat. Uneven terrain results in undulations in the glidescope. In recent years, models have been evolved for predicting such aberrations as a simpler alternative to experimental methods. Such modeling normally assumes the ground to be fully conducting. A method is presented for considering imperfect terrain ... View full abstract»

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  • Calculation of resonance current in high-frequency series-resonance DC-DC converters

    Publication Year: 1988, Page(s):124 - 132
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (448 KB)

    A method to calculate the resonance current in high-frequency series-resonant DC-DC converters is presented that includes the effect of the reverse-bias capacitance of output rectifiers and that of the primary inductance of the output transformer. A computer program developed as a tool to determine the amplitude of the resonance current for any given input and output conditions is also discussed. ... View full abstract»

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  • Control of an aircraft electric fuel pump drive

    Publication Year: 1988, Page(s):171 - 176
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (372 KB)

    The concept of designing a high-speed, permanent magnet, brushless DC motor aircraft fuel pump drive using a cycloconverter link is examined. A combination of sinusoidal and DC steady-state analysis is used to produce a simple model of the system. A closed-loop control system with an outer loop based on speed and an inner loop based on current is postulated wherein a proportional-plus-integral con... View full abstract»

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  • Improved multilevel quantization for detection of narrowband signals

    Publication Year: 1988, Page(s):142 - 147
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (460 KB)

    Nearly optimum quantization levels for multileveled quantizers in radar receivers and distributed-detection are calculated for preassigned false-alarm probability Q0 by maximizing the detection probability Qd after replacing both Q 0 and (1-Qd) by the saddlepoint approximations. Narrowband signals of random phase and w... View full abstract»

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  • Noise effects on centroid tracker aim point estimation

    Publication Year: 1988, Page(s):177 - 185
    Cited by:  Papers (8)  |  Patents (60)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (576 KB)

    An investigation of errors due to noise in centroid tracker aim-point estimation is presented. The centroid tracker discussed is similar to the tracker described by A.L. Gilbert et al. (1980). Simplifications to this algorithm were made so that the derived models would be consistent with the actual tracker algorithm. Two statistical models are derived which relate image noise effects to computatio... View full abstract»

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  • Rotational maneuver of nonlinear uncertain elastic spacecraft

    Publication Year: 1988, Page(s):114 - 123
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (664 KB)

    The question of attitude control and elastic mode stabilization of a spacecraft (orbiter) with beam-tip-mass-type payloads is considered. A three-axis moment control law is derived to control the attitude of the spacecraft. The derivation of the control moments acting on the spacecraft does not require any information on the system dynamics. The control law includes a reference model and a dynamic... View full abstract»

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Aims & Scope

IEEE Transactions on Aerospace and Electronic Systems focuses on the organization, design, development, integration, and operation of complex systems for space, air, ocean, or ground environment.  These systems include, but are not limited to, navigation, avionics, spacecraft, aerospace power, radar, sonar, telemetry, defense, transportation, automated testing, and command and control. 

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Meet Our Editors

Editor-in-Chief
Michael Rice
Brigham Young University