Angle only range estimator for homing missile
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United States of America Patent
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Aug 26, 1997
Grant Date -
N/A
app pub date -
May 23, 1996
filing date -
May 23, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
Missile motion information from an inertial measurement set and the angle-to-target information from a seeker/sensor is used to estimate range and/or time to go on a homing missile without a direct measurement of range or range rate. Up to six comparisons of spectrally matched linear and angular measurements, corrected by target state estimates and analytical coupling terms, are used to determine the error in the range estimate. A nonlinear sorting and filtering procedure rejects the unusable error sources among the six potential error sources, and thresholds against too little information. The stability margin in the missile guidance loop is used as a sensor indicator for excessive estimated range.
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