Abstract: A computational aid device for Ekelund range determinations comprising a e member adapted to be placed over a bearing/time plot and including two leg members to be aligned with intersecting bearing rate lines faired through the plot, and a range scale positionable with respect to the base and the leg members to provide direct readings of range and of probable limits of range error.

Abstract: A terrain vehicle contour measuring and storage system is disclosed, for ulating a carrier vehicle, which senses and follows a model board surface by means of first, second, third, and fourth terrain probes, with each of the terrain probes providing an analog signal which is proportional to the elevation sensed by the terrain probe. The terrain probes are connected in a unique combination with a pair of shift registers, with each shift register having a plurality of adjacent storage bits, and a computer. The computer, upon sampling the analog signals obtained from the terrain probes, calculates the pitch, roll, and heave of the carrier vehicle body being simulated by the terrain vehicle contour measuring and storage system.

Abstract: An acceleration cueing simulation device is disclosed for applying sustai, as well as dynamic, acceleration forces to a trainee pilot as he operates an aircraft simulator. The acceleration cueing device comprises a pair of Helmholtz coils for generating a uniform magnetic field; an aircraft control device for generating a control data signal which is responsive to simulated flight maneuvers performed by the trainee pilot; and a computer system for producing a plurality of digital logic signals which are in response to the control data signal. The plurality of digital logic signals, when converted to analog signals, will energize a plurality of coils which are embedded in a suit and a helmet worn by the trainee pilot. When the trainee pilot is within the magnetic field generated by the Helmholtz coils, the coils embedded within the suit and the helmet provide a plurality of simulated acceleration forces which are exerted upon the trainee pilot.

Abstract: Means are provided for reducing the dynamic range requirement of an underer sound system by minimizing the effects of noise interference. Computer means are provided to automatically rotate the pattern function of the combination of the dipole hydrophones in the system. A minimum noise pattern position is derived from hydrophone output information.