초록 ▼

A method and system optimally determines a desired Height of Burst (HOB) over a target based solely upon the time at which the projectile reached or passes through the apogee or apex of its trajectory (ta). There are several modes of implementation. According to one mode, the downleg is determined a

A method and system optimally determines a desired Height of Burst (HOB) over a target based solely upon the time at which the projectile reached or passes through the apogee or apex of its trajectory (ta). There are several modes of implementation. According to one mode, the downleg is determined as a percentage of the upleg. According to another mode, the time to Height Of Burst (tHOB) is calculated algebraically based substantially solely upon the time to height of apogee ta.

대표청구항 ▼

What is claimed is: 1. A method of determining the time tHOB to a desired Height Of Burst (HOB) of a projectile comprising the steps of: a. determining, through the effect of a sensor on-board the projectile, when the projectile reaches its apogee after launch; b. measuring the actual time ta that

What is claimed is: 1. A method of determining the time tHOB to a desired Height Of Burst (HOB) of a projectile comprising the steps of: a. determining, through the effect of a sensor on-board the projectile, when the projectile reaches its apogee after launch; b. measuring the actual time ta that it takes said projectile to reach the apogee after launch; and c. calculating the time to the desired Height Of Burst tHOB based upon the actual measured time ta; wherein said on-board sensor is one selected from the group consisting of: accelerometric sensor, gyroscopic sensor, velocity sensor, global positioning sensor, inertial sensor, and MEMs. 2. The method of claim 1 wherein the calculating step c above comprises setting the tHOB as a percentage X % of ta wherein said percentage is less than 100% and wherein tHOB=ta+X % tata. 3. The method of claim 2 wherein said percentage of ta is calculated as follows: if ta>12 seconds then down leg time=90% of ta; if 12 sec>ta>9 seconds then down leg time=70% of ta; if 9 sec>ta>7 seconds then down leg time=10% of ta; if ta<7 seconds then there may be a malfunction and the projectile should be disabled. 4. The method of claim 1 wherein said step c is calculated as follows: tHOB=ta+√{square root over (ta2-2×HOB/g+C)} where g=9.81 m/sec2=32 ft/sec2 and C=correction factor. 5. The method of claim 4 wherein said correction factor C is calculated as follows: if ta>12 seconds then C=1.0 sec; if 12 sec>ta>9 seconds then C=0.75 sec; if 9 sec>ta>7 seconds then C=0.5 sec; if ta<7 seconds then there may be a malfunction and the projectile should be disabled.