| 摘要 |
A method and apparatus is disclosed for determining the range between two planes, ownship ( 10 ) and target ( 12 ). Model data ( 66 ) estimating the velocity and position of target ( 12 ) is compared to actual flight path data of the target ( 12 ) passively received by ownship ( 10 ). The model data ( 66 ) and actual data is compared, and an error measurement is calculated. The model data is also subject to position and velocity constraints ( 78 and 82 ) which penalize unrealistic estimates. The error measurement and penalties are used to create a perturbation model ( 90 ) which is added to the model data to generate new model data. When the model data ( 66 ) conforms closely to the actual data, a range is computed from the model data ( 66 ).
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