Safe and arming device
First Claim
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1. A safe and arming device comprising:
- linear accelerometer means for determining linear acceleration, said linear accelerometer having an output;
angular accelerometer means for determining angular acceleration, said angular accelerometer having an output;
actuator means for actuating a munition, said actuator means having an input; and
safe and arming logic means for determining a time delay and actuating said actuator means, said safe and arming logic means having a first input coupled to said output of said linear accelerometer, a second input coupled to said output of said angular accelerometer, and an output coupled to said input of said actuator.
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Abstract
The present invention consists of a safe and arming device and method that utilizes a combination of linear and angular accelerometers to determine the type of weapon being used. From a determination of the type of weapon an arming distance is looked-up and divided by the linear velocity to provide an arming delay time. When the delay time has elapsed an actuator is activated thereby arming the munition.
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Citations
11 Claims
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1. A safe and arming device comprising:
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linear accelerometer means for determining linear acceleration, said linear accelerometer having an output; angular accelerometer means for determining angular acceleration, said angular accelerometer having an output; actuator means for actuating a munition, said actuator means having an input; and safe and arming logic means for determining a time delay and actuating said actuator means, said safe and arming logic means having a first input coupled to said output of said linear accelerometer, a second input coupled to said output of said angular accelerometer, and an output coupled to said input of said actuator. - View Dependent Claims (2, 3, 4, 5)
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6. A safe and arming device comprising:
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linear accelerometer means for determining linear acceleration, said linear accelerometer having an output; angular accelerometer means for determining angular acceleration, said angular accelerometer having an output; twist determining means for determining a ratio of linear acceleration to angular acceleration, said twist determining means having a first input coupled to said output of said linear accelerometer, a second input coupled to said output of said angular accelerometer, and an output; lookup means for looking up a variable in response to an input from said twist determining means, said lookup means having an input coupled to said output of said twist determining means and an output; first dividing means for dividing a first input signal by a second input signal, said first dividing means having a first input coupled to said output of said lookup means, a second input coupled to said output of said linear accelerometer, and an output; timing means for activating said actuator following a time delay, said timing means having a input coupled to said output of said first dividing means and an output coupled to said input of said actuator; and actuator means for actuating a munition, said actuator means having an input coupled to said output of said timing means. - View Dependent Claims (7, 8, 9)
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10. A method of arming a munition comprising the steps of:
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firing said munition from a weapon; measuring a linear and an angular acceleration of said munition; processing said linear and angular accelerations to derive linear and angular velocities of said munition; dividing said linear velocity by said angular velocity providing a twist ratio; looking-up a distance in a lookup table that corresponds to said twist ratio; dividing said distance by said linear velocity deriving a time delay; loading said time delay into a timer; and activating an actuator after said time delay has elapsed.
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11. A method of arming a munition comprising the steps of;
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firing said munition from a weapon; measuring a linear and an angular velocity of said munition; determining a type of munition from a ratio of the linear and angular velocities; determining the arming distance of the munition using said type of munition; determining a time delay by dividing the arming distance by the linear velocity of the munition; activating an actuator after said time delay has elapsed.
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Specification