In building simulators for training purposes more and more of the simulation activities are being carried out by digital computers. One of the basic problems in checking out a large complex simulator system is the testing and evaluating -- and, where necessary, the correction -- of the computer programs in the simulation computer. As a design tool, this invention contemplates simulating that portion of the entire system which is not usually simulated and providing between the master simulation c...

An oven with temperature-independent sections permits objects placed within t to experience the uneven heating and temperature gradient problems associated with real life conditions. The number of sections can vary depending on the gradients desired.

This invention is a system for teaching the principles of Omega navigation and the operation of Omega receivers, which system comprises a simulation computer that provides to an Omega interface (which acts as an Omega receiver) the appropriate Omega signals to simultaneously represent a plurality of Omega transmitters, and an on-board computer that is stimulated by the formatted output of the Omega interface. A student may enter the location of his vehicle into the on-board computer and observe ...

At least two test instructions are sequentially simulated. Concurrently the number of clocks taken for simulating at least two test instructions are counted. The peripheral processing program relating to at least two test instructions are simulated for the number of clocks counted after simulating at least two test instructions.

The aimed launching of projectiles is simulated by means of an electroacoustic transducer which is energized to emit a beam of sound waves, preferably at ultrasonic frequency. A cooperating target also employs an electroacoustic transducer and apparatus for indicating reception of the sound beam by that transducer. The emitter transducer may be mounted in a simulated firearm, or other projectile launcher, while the receiver transducer may be mounted on a simulated target.

A simulation method includes a step of modifying a model in a simulation process, a step of detecting elements influenced by the model modification, and a step of performing a resimulation process while returning to the earliest one of the influenced elements. According to the disclosed method, a resimulation process associated with the model modificaiton can be realized in a short time without the inconvenience of the prior art in which the resimulation is carried out with a waste of time even ...

The shadowgraph visual simulation system, for a land vehicle simulator, includes a three-dimensional model of terrain; and a light source mounted at a fixed height within the boundaries of the model and able to change its relative position within the model boundaries in accordance with supposed changes of the position therein of the vehicle simulated. An upright translucent viewing screen is mounted at one side of the model and on to one side of this the light source projects a changing picture ...

Digital data in the form of a bit pulse train from a phase shift generator is divided into a primary bit part and a remainder code. The remainder code is examined in correction code logic circuitry to determine the addition of a selected phase increment to the primary bit part of the phase shift digital data. If the remainder code falls within predetermined limits, a random addition of the selected phase increment will be made. The mean value of a large number of random additions is based on the...

An apparatus is disclosed to simulate an electronic circuit having a number of circuit elements, each being coupled to an associated set of nodes, a pair of which are capable of carrying a current therebetween, such as transistors. The apparatus has a selection device to select a circuit element to be simulated. A first memory is coupled with the selection device for storing the characteristics of each of the transistors. A transfer device transfers the characteristics from the first memory to a...

A method of simulating the operation of a circuit utilizing voltage or current data obtained from measurements of actual samples of each of the circuit components. The actually measured voltage or current data is employed to mathematically analyze operation of the circuit. In this process, each circuit component is characterized as one or more of a voltage controlled voltage source, voltage controlled current source, current controlled voltage source and current controlled current source. After ...