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Differential Ballistic Wind Computer

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2 Author(s)
Dornfest, Albert ; International Business Machines Corporation Federal Systems Division Space Guidance Center Owego, New York ; Cascio, George

From the weapon's release point in the aircraft to its final burst point at the target, winds may considerably affect a weapon's trajectory. Aircraft bombing-navigational systems must compensate for such wind effects in order to achieve accurate solutions to the bombing problem. Such compensation is provided by a recently-designed analog device called the Differential Ballistic Wind Computer (DBWC). The DBWC furnishes automatic and continuous corrections for "differential ballistic wind" (DBW), without loss of any of the other capabilities of the bombing-navigational system. DBW is the vector difference between ballistic wind (BW) and wind at aircraft altitude (W). (BW is that constant wind velocity which has the same effect upon the weapon's trajectory as the net resultant of all actual wind velocities encountered during the trajectory.) These corrections for DBW are supplied in the form of two DBWC output signals, XDBN and XDBE, which represent the north-sourth and east-west corrections, respectively. XDBN and XDBE are used to vary aircraft heading and time-to-go during system Bomb mode operation, thereby providing a more accurate bomb drop. A distinguishing feature of DBWC circuitry is that it computes the DBW components by modifying a preset partial ballistic wind (BWP) by the product of a preset wind weighting factor (aw) and wind at aircraft altitude (W). The resulting DBW components are resolved about aircraft ground track, and the resolved signals are eventually converted into the corresponding north-south and east-west range signals.

Published in:

Aerospace, IEEE Transactions on  (Volume:1 ,  Issue: 2 )

Date of Publication:

Aug. 1963

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