One of the widely used geometrical configurations for magnetic interpretation is the long horizontal circular cylinder. Gay (1965) provides a set of master curves for the interpretation of magnetic anomalies of these bodies. Rao et al. (1973) formulates functions of the anomaly at several distances from an arbitrary point, and the linear equations thus formed are solved for coefficients related to the parameters of the causative body. Prakasa Rao and Murthy (1976) propose an empirical method for rapid interpretation. Atchuta Rao and Ram Babu (1980), Mohan et al. (1982), and Sampath Kumar and Prakasa Rao (1984) describe methods based on Hilbert transforms. Radhakrishna Murthy et al. (1980) propose a method based on two components of the anomalous magnetic field. With the exception of the direct method of Prakasa Rao and Murthy (1976), the other methods mentioned involve reduction of field curves and then matching with master curves, solving linear equations, performing Hilbert transformations, and computation of derivatives, respectively. Hence they are not suitable for direct and rapid interpretation. This note contains a simple nomogram for the magnetic effect due to an arbitrarily magnetized horizontal cylinder.

In this paper a design of the F/A-18A Automatic Carrier Landing System is accomplished using finite horizon //oo techniques. If the final time is sufficiently large, the dynamic Riccati equations involved in the design give rise to constant solutions. Making use of a suboptimal value of performance, an output feedback controller is synthesized. Only longitudinal equations of motion are considered, and thrust is incorporated as a control variable. The objective of the design is to maintain a constant flight path angle under worst case conditions of vertical gust and sensor noise during carrier landing. The design yields satisfactory response for vertical rate command as well.

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