US2414819A - Computer for ballistic interactions - Google Patents

Description

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2 Claims.

This invention relates to apparatus for the control of artillery re, and particularly to electromechanical artillery computers.

The object of the invention is an apparatus correcting for the ballistic effects of non-standard ballistic conditions and for the ballistic eiiects of interactions between non-standard ballistic conditions.

In prior electromechanical artillery computers, it was assumed that the ballistic eiiects are independent of each other, and that independent corrections could be made for each effect. It has been found that this assumption is incorrect, and that certain ballistic effects interact with other ballistic effects to produce an appreciable error. Assume that both the muzzle velocity of the weapon. and the density of the air are nonstandard. In prior computers, corrections were made for non-standard muzzle velocity with standard air density and for non-standard air density at standard muzzle velocity. In the present computer, corrections are made also for the effect of nonstandard air density on the correction for non-standard muzzle velocity and for the effect of non-standard muzzle velocity on the correction for non-standard air density.

In the drawings:

Fig. 1 schematically shows a system for transmitting data from the observing stations to the computer;

Fig. 2 schematically shows a system for generating voltages proportional to the coordinates of the present position of the target;

Fig. 3 schematically shows a system for synthetically generating voltages proportional to the coordinates of the present position of the target, or voltages proportional to the rates of change in said coordinates;

Fig. 4 schematically shows a system for indicating the present'position of the target with respect to the gun, for generating voltages proportional to the rates of change in the coordinatos, and voltages proportional to the coordinates of the predicted positionrof the target; "Figi 5 schematically shows a system for indicating the azimuths and quadrant elevations of two guns, generating a voltage proportional to the range of the second gun, and generating volt- 'ages proportional to the maximum effects of the wind;

Fig. 6 schematically shows a system for indicating thc deection angle of a rst gun, for generating voltages proportional to the range of the mst gun, and for indicating the ballistic elevation angle of a second gun;

mor one hundred yards, are transmitted by a dataF`v` Figs. 7 and 8 schematically show 'a system for indicating the ballistic elevation angle of a iirst sun:

Figs. 9 and 10 show, in elevation and plan, the

geometric relationships between the observation stations, target and guns;

Fig. 11 schematically shows a summing ampliiier used in Figs, l to 8;

Fig. 12 schematically shows a controll circuit used in Figs. 4, 5, 6, 8;

Fig. 13 schematically shows a number of potentiometer networks;

Figs. 14 to 18 show curves related to the networks of Fig. 13;

Figs. 19 to 28 show curves related to Figs. 7 and 8;

Fig. 29 shows an operation table for the switches and potentiometers of Fig. 5 and the relays and ampliers of Fig. 4.

Fig. 30 shows the assembly arrangement of Figs. l to 8, inclusive, to make up a schematic diagram of the complete system.

The present director is primarily intended for the control of coast defense artillery, but the invention is not limited to such use, as it may be used in many other artillery directors in which unusual accuracy is required.

The largest coast defense weapons have ranges of twenty miles or more, thus, a target moving along the coast may be under observation for twenty to thirty miles on each side of the gun. A number of observation stations are distributed at convenient points along the coast and, as these stations may be more than twenty miles from the director, the transmission of the observed data from the observation stations to the director by the usual synchronous transmission systems, may be impractical. In the present system, the even degrees of azimuth or the hundreds of yards may be transmitted orally at regular intervals over a telephone system between the observing station and the director, while the fractional values of the data less than one degree transmission system of the type shown in United tates Patent 1,483,235, February 12, 1924, R. V. Morse.

As shown in Fig. l, each base end station is furnished with a telephone instrument I connected to the secondary winding of a composite coil 2 having line windings intercalated in series with the data transmission line. A capacitor 3 confines the telephone current to the transmission line.

At the director, a similar composite coil Al has line windings intercalated in the trans-

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