Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services,

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... te for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. Recent advances in digital signal processors (DSPs) and low cost sensing technology provide the capability for on-board attitude (orientation) determination for gun-launched projectiles. A complete, real-time solution for all three Euler angles (azimuth, elevation, and roll) that describes a projectile's attitude is presented, which uses magnetometers and angular rate sensors processed by a DSP. Unlike attitude estimation systems that rely exclusively on costly rate gyroscopes, magnetometers are used to stabilize drift errors. The proposed system fulfills the requirements of passive sensing, high-g survivability, small size, low cost, and low power. 15. SUBJECT TERMS attitude; magnetometers 16. SECURITY CLASSIFICATION OF: 19a. NAME OF RESPONSIBLE PERSON Michael J. Wilson a. REPORT Unclassified b. ABSTRACT Unclassified c. THIS PAGE Unclassified 17. LIMITATION OF ABSTRACT UL 18. NUMBER OF PAGES 25 19b. TELEPHONE NUMBER (Include area code) 410-306-1920 Standard Form 298 (Rev. 8/98) Prescribed by ANSI Std. Z39.18