Computer circuit

Claim 2

In a device including at least one channel for producing at least one ballistic signal corresponding to range times at least one ballistic equation for the ballistics of a projectile type, the ballistic equation including terms for the effects of ballistic conditions and the effects of environmental conditions comprising: first means coupled to receive a range signal for operating on the received range signal by a factor comprising a normalizing transfer function to produce a normalized range signal for a specific projectile type which normalized range signal is standardized relative to a single predetermined transfer function common to the ballistics of a plurality of projectile types; second means coupled to receive the normalized range signal for operating on the normalized range signal by the single predetermined transfer function common to the ballistics of a plurality of projectile types for generating a nonlinear function signal; and third means coupled to receive the nonlinear function signal from said second means for operating on the nonlinear function signal by a factor comprising an unnormalizing transfer function for producing the at least one ballistic signal for the selected projectile type.

Claim 3

The device of claim 1 in which said first means and said third means operates on the received signals by the transfer functions that include ballistic condition and environmental condition effects on the ballistics of a specific projectile type.

Claim 4

The device of claim 1 in which said second means operates on the received normalized range signal by a predetermined nonlinear transfer function that is common to the ballistics of a plurality of projectile types.

Claim 5

The device of claim 1 in which said second means operates on the received normalized range signals by a predetermined exponential transfer function.

Claim 6

The device of claim 1 in which said second means operates on the received normalized range signal by a predetermined transfer function including an exponential function of the base e with an exponent thereof comprising the normalized range signal.

Claim 7

The device of claim 1 in which said first means and said third means operate on the received signals by linear factors including terms corrEsponding to the effects of ballistic conditions and environmental conditions including the projectile mass m, projectile diameter d, drag coefficient KD, atmospheric density p, and initial projectile velocity Vo.

Claim 8

The device of claim 6 in which said third means operates on the received nonlinear function signal by a factor further including the effect of gravity g and initial projectile velocity Vo.

Claim 9

The device of claim 7 in which said first means operates on the received range signal by approximately the normalizing transfer function m/pd2KD and said third means operates on the received nonlinear function signal by approximately the unnormalizing transfer function mg/2pd2VoKD.

Claim 10

The device of claim 6 in which said first means operates on the received range signals by approximately the normalizing transfer function m/pd2KD and said third means operates on the received nonlinear function signal by approximately the unnormalizing transfer function m/pd2VoKD.

Claim 11

The device of claim 1 in which said first means and said third means are each adjustable for selectively operating on the received signals by a factor comprising a selected individual one of a plurality of linear transfer functions, each including individual terms derived from the effects of ballistic conditions and environmental conditions on the ballistics of a selected individual one of a plurality of projectile types.

Claim 12

The device of claim 3 in which said first means and said third means are adjustable for selectively operating on the receive signals by selected individual ones of a plurality of linear transfer functions, each including individual terms derived from the effects of ballistic conditions and environmental conditions on the ballistics of a selected individual one of a plurality of projectile types.

Claim 13

The device of claim 8 in which said first means and said third means are adjustable for selectively operating on the received signals by individual ones of a plurality of linear transfer functions, each including individual terms derived from the effects of ballistic conditions and environmental conditions on the ballistics of a selected individual one of a plurality of projectile types.

Claim 14

The device of claim 9 in which said first means and said third means are adjustable for selectively operating on the received signals by selected individual ones of a plurality of linear transfer functions, each including individual terms derived from the effects of ballistic conditions and environmental conditions on the ballistics of a selected individual one of a plurality of projectile types.

Claim 15

The device of claim 1 in which said second means operates on the received normalized range signal by the predetermined transfer function approximating where R is the range e equals about 2 7183 1/Rn is a normalizing constant m projectile mass p air density d projectile diameter KD drag coefficient for producing the nonlinear function signal.

Claim 16

The device of claim 6 in which said second means operates on the normalized range signal by the predetermined transfer function approximating where: R is the range E equals about 7183 1/Rn is a normalizing constant for producing the nonlinear function signal.

Claim 17

The device of claim 8 in which said second means operates on the received normalized range signal by the predetermined transfer function approximating where R is the range e equals about 2 7183 1/Rn is a normaLizing constant for producing the nonlinear function signal.

Claim 18

The device of claim 1 in which said second means operates on the received normalized range signal by the predetermined transfer function approximating e(R/Rn)-1 where: R is the range e equals about 2 7183 1/Rn is a normalizing constant m projectile mass p air density d projectile diameter KD drag coefficient for producing the nonlinear function signal.

Claim 19

The device of claim 6 in which said second means operates on the received normalized range signal by the predetermined transfer function approximating e(R/Rn)-1 where: R is the range e equals about 2 7183 1/Rn is a normalizing constant for producing the nonlinear function signal.

Claim 20

The device of claim 9 in which said second means operates on the received normalized range signal by the predetermined transfer function approximating e(R/Rn)-1 where: R is the range e equals about 2 7183 1/Rn is a normalizing constant for producing the nonlinear function signal.

Claim 21

The device of claim 1 having a first channel and a second channel, said first means being common to both the channels, the channels each including an individual said second means and an individual said third means, said third means included in the first channel being operable to produce a first ballistic signal related to superelevation and said third means included in the second channel being operable to produce a second ballistic signal related to time of flight.

Claim 22

The device of claim 2 having a first channel and a second channel, said first means being common to both the channels, the channels each including an individual said second means and an individual said third means, said third means included in the first channel being operable to produce a first ballistic signal and said third means included in the second channel being operable to produce a second ballistic signal.

Claim 23

The device of claim 21 in which said third means included in the first channel is operable to produce the first ballistic signal related to superelevation and said third means included in the second channel is operable to produce the second ballistic signal related to time of flight.

Claim 24

The device of claim 20 in which said first means operates on the received range signal by approximately the normalizing transfer function m/pd2KD; said third means included in the first channel operates on the received nonlinear function signal by approximately the unnormalizing transfer function mg/2pd2VoKD; and said third means included in the second channel operates on the received nonlinear function signal by approximately the unnormalizing transfer function m/pd2VoKD where: m projectile mass p air density d projectile diameter KD projectile drag coefficient V0 projectile initial velocity g gravitational effects.

Claim 25

The device of claim 23 in which said second means included in the first channel operates on the received normalized range signal by the single predetermined transfer function approximating and said second means included in the first channel operates on the received normalized range signal by the single predetermined transfer function approximating e(R/Rn)-1 where: R range 1/Rn normalizing function

Claim 26

The device of claim 23 in which said first means and said third means are adjustable for selectively operating on the received signals by individual transfer functions of a plurality of transfer functions each derived from the effects of ballistic conditions m, d, KD and Vo, and environmental conditions p and g on the ballistics of a selected individual one of a plurality of projectile types.

Claim 27

The device of claim 24 in which said first means and said third means are adjustable for selectively operating on the received signals by individual transfer functions of a plurality of transfer functions each derived from the effects of ballistic conditions m, d, KD and Vo and environmental conditions p and g on the ballistics of a selected individual one of a plurality of projectile types.

Claim 28

In a ballistic computer, the improvement comprising: a first multiplier circuit having an operational amplifier with a feedback resistor connected between the output terminal thereof and an input terminal thereto, a plurality of parallel resistance branches each having a junction FET transistor connected in series with a resistor, each of said resistance branches being coupled to receive a range signal at one end, and being connected to said input terminal of said operational amplifier at the other end, switch means for applying an electrical signal to gate terminals of said junction FET transistors to turn on one of said junction FET transistors and to turn off the other ones of said junction FET transistors for setting the gain of said operational amplifier to normalize the range signal in accordance with ballistics conditions and environmental conditions for producing a normalized range signal; a function generator including an operational amplifier having a feedback resistor connected between an output terminal thereof and an input terminal thereto, a break point selector circuit having a plurality of voltage comparators each responsive to individual spaced-apart voltage points and being coupled to receive the normalized range signal for generating a break point signal for each voltage point that the normalized range signal exceeds, a first plurality of resistance branches and a second plurality of resistance branches wherein all of said resistance branches include a resistor and all except one of said resistance branches includes a junction FET transistor connected in series with said resistor, all of said branches being connected at one end to an input of said operational amplifier, the said first plurality of resistance branches being coupled at the other end to receive the normalized range signal for setting the gain slope of the operational amplifier to match a portion of a ballistic function related to a plurality of ammunition, and said second plurality of resistance branches being coupled at the other end to receive a voltage signal to bias the gain slope of said operational amplifier to a predetermined portion of the ballistic function, and said junction FET transistors being responsive to be turned on by individuals of the ones of the break point signals from said comparators to set the gain slope of said operational amplifier by selected ones of said first plurality of resistance branches and to bias the gain slope of said operational amplifier to a predetermined level by selected ones of said second plurality of resistance branches for generating a normalized function signal; and a second multiplier circuit having an operational amplifier with a feedback resistor connected between the output terminal thereof and an input terminal thereto, a plurality of parallel resistance branches each having a junction FET transistor connected in series with a resistor, each of said resistance branches being coupled to receive the function signal at one end, and being connected to said input terminal of said operational amplifier at The other end, switch means for applying an electrical signal to gate terminals of said junction FET transistors to turn on one of said junction FET transistors and to turn off the other ones of said junction FET transistors for setting the gain of said operational amplifier to unnormalize the function signal in accordance with ballistic conditions and environmental conditions to produce ballistic signals for selected ammunitions.

Claim 29

In a ballistic computer, the improvement comprising: a first multiplier circuit having an operational amplifier with a feedback resistor connected between the output terminal thereof and an input terminal thereto, a plurality of parallel resistance branches each having a junction FET transistor connected in series with a resistor, each of said resistance branches being coupled to receive a range signal at one end, and being connected to said input terminal of said operational amplifier at the other end, switch means for applying an electrical signal to gate terminals of said junction FET transistors to turn on one of said junction FET transistors and to turn off the other ones of said junction FET transistors for setting the gain of said operational amplifier to normalize the range signal in accordance with ballistics conditions and environmental conditions for producing a normalized range signal; a function generator including an operational amplifier having a feedback resistor connected between an output terminal thereof and an input terminal thereto, a break point selector circuit having a plurality of voltage comparators each responsive to individual spaced-apart voltage points and being coupled to receive the normalized range signal for generating a break point signal for each voltage point that the normalized range signal exceeds, a first plurality of resistance branches and a second plurality of resistance branches wherein all of said resistance branches include a resistor and all except one of said resistance branches includes a junction FET transistor connected in series with said resistor, all of said branches being connected at one end to an input of said operational amplifier, the said first plurality of resistance branches being coupled at the other end to receive the normalized range signal for setting the gain slope of the operational amplifier to match a portion of a ballistic function related to a plurality of ammunition, and said second plurality of resistance branches being coupled at the other end to receive a voltage signal to bias the gain slope of said operational amplifier to a predetermined portion of the ballistic function, and said junction FET transistors being responsive to be turned on by individuals of the ones of the break point signals from said comparators to set the gain slope of said operational amplifier by selected ones of said first plurality of resistance branches and to bias the gain slope of said operational amplifier to a predetermined level by selected ones of said second plurality of resistance branches for generating a normalized function signal; and a second multiplier circuit having an operational amplifier with a feedback resistor connected between the output terminal thereof and an input terminal thereto, a plurality of parallel resistance branches each having a junction FET transistor connected in series with a resistor, each of said resistance branches being coupled to receive the function signal at one end, and being connected to said input terminal of said operational amplifier at The other end, switch means for applying an electrical signal to gate terminals of said junction FET transistors to turn on one of said junction FET transistors and to turn off the other ones of said junction FET transistors for setting the gain of said operational amplifier to unnormalize the function signal in accordance with ballistic conditions and environmental conditions to produce ballistic signals for selected ammunitions.