By Topic

Aerospace and Electronic Systems Magazine, IEEE

Issue 1 • Date Jan. 1992

Filter Results

Displaying Results 1 - 9 of 9
  • Kalman filter mechanization for INS airstart

    Page(s): 3 - 11
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (964 KB)  

    A strapdown mechanization and associated Kalman filter are developed to provide both ground align and airstart capabilities for inertial navigation systems (INSs) using Doppler velocity and position fixes, while not requiring an initial heading estimate. Position update during coarse mode is possible by defining sine and cosine of wander angle as filter states and modeling the position error in geographic frame while integrating velocity in the wander frame. INS Global Positioning System (GPS) differential position due to GPS antenna moment arm can aid heading convergence during hover turns in helicopter applications. Azimuth error state in the fine mode of the filter is defined as wander angle error to provide continuous estimation of navigational states, as well as inertial/aiding sensor errors, across the coarse-to-fine mode transition. Though motivated by a tactical helicopter application, the design can be applied to other vehicles. Advantages over conventional systems in addition to the airstart capability include robustness and versatility in handling many different operational conditions.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Never make the same mistake twice-using configuration control and error analysis to improve software quality

    Page(s): 12 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (551 KB)  

    To provide a controlled environment, changes to the Space Shuttle primary avionics system software have been grouped into operational increments (OIs) that identify a predefined set of changes and discrepancy corrections (a baseline) for that OI. Two early processes implemented were an automated configuration management database and a prologue in all the code modules. This allows a causal analysis program that permits each problem to be analyzed to determine the change authorization that caused the code modification that results in the problem. This causal analysis provides the information that is used for process improvement and to measure effectiveness.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Integrated flight/fire control for attack helicopters

    Page(s): 17 - 23
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (635 KB)  

    It is shown that integrated flight and fire control modes, analogous to those used in fixed-wing applications, can be implemented to enhance an attack helicopter's air-to-air and air-to-ground combat effectiveness. With fly-by-wire active flight controls and state-of-the-art technology in target acquisition and tracking, integrated flight/fire control can increase firing opportunities, improve weapon accuracy and enhance survivability. Two typical applications are illustrated, using detailed simulations of the fly-by-wire controlled helicopter and associated weapons systems. The avionics architecture needed to implement an integrated system is described, and it is shown that it is achievable with straightforward extensions of designs already in place for advanced versions of the AH-64 aircraft.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Tools and techniques for estimating high intensity RF effects

    Page(s): 24 - 31
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (768 KB)  

    Tools and techniques for estimating and measuring coupling and component disturbance for avionics and electronic controls are described. A finite-difference-time-domain (FD-TD) modeling code, TSAR, used to predict coupling is described. This code can quickly generate a mesh model to represent the test object. Some applications as well as the advantages and limitations of using such a code are described. Facilities and techniques for making low-power coupling measurements and for making direct injection test measurements of device disturbance are also described. Some scaling laws for coupling and device effects are presented. A method for extrapolating these low-power test results to high-power full-system effects are presented.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Situation assessment using cellular automata paradigm

    Page(s): 32 - 37
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (518 KB)  

    The cellular automata (CA) concept is introduced, and it is shown how it is applied to situation assessment in connection with digital map-based tasks. The demonstration system makes use of 11480 virtual processors. Although the use of the CA paradigm was motivated by projections of future availability of massively parallel hardware, the CA algorithms have run efficiently on ordinary serial computers.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design for validation

    Page(s): 38 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (595 KB)  

    An approach is outlined for the development of ultrareliable avionics for civil air transports using a design-for-validation philosophy that includes rigorous application of formal methods. The basic concept of the methodology is introduced, and the role of formal methods is explored. The impact of the design-for-validation philosophy on the system design process is then demonstrated by two simple examples. More details about the design-for-validation methodology are then given.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Digital avionics-an international perspective

    Page(s): 44 - 45
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (172 KB)  

    It is maintained that the dynamism of electronics technology, especially in displays, microprocessors and software, makes for exciting promises and problems in avionics. International barriers are disappearing, and the trends towards downsizing, new alliances, and consolidation should ultimately lead to a stronger avionics industry worldwide.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electrical power on a 30 kW space-based radar satellite

    Page(s): 46 - 50
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    An electrical power system for a space-based radar satellite is described. When the radar is on, its transmitter needs an average DC power of 30 kW. The problem of distributing the power efficiently in pulses to many transmit/receive modules is addressed. System requirements include a high-voltage battery and transmission line, load-sharing between the solar array, and the battery during sunlit periods, and a 25-kW solar array. A scaled-down version of the power system for a proof-of-concept demonstration is described.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Not invented here? Check your history

    Page(s): 51 - 53
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (263 KB)  

    The operations of the US Army Corps of Engineers' Manhattan Project, started on September 17, 1942, are examined as an example of US success in R&D.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Teresa Pace, PhD EE
Chief Engineer SenTech
SenTech, LLC - A DSCI Company
12601 Research Parkway
Orlando, FL 32826
(407) 207-1900 ext: 2102
(407) 450-0929 (BB)
tpace@sentech.dsci.com