Passive Sonar Ekelund Range Calculator
Submarine Target Motion Analysis (TMA): Compute instantaneous target range ($R$), across-LOS relative acceleration, and Closest Point of Approach (CPA) using the classic Ekelund ranging maneuver.
Leg 1: Pre-Maneuver Bearing & Drift
Line-of-sight bearing (000°–360°)
- = Left drift, + = Right drift
Leg 2: Post-Maneuver Bearing Drift
Ekelund maneuver turn
New bearing drift rate after steadying on Leg 2
Target Motion Analysis (TMA) Range
Calculated Ekelund Range:
--
yards (nautical miles)
Metric Target Distance:
--
kilometers (meters)
Change in Across-LOS Speed:
--
knots perpendicular to LOS
Change in Bearing Drift Rate:
--
deg/min (rad/s)
| Leg 1 Across-LOS Speed V_o1,⊥: | -- |
| Leg 2 Across-LOS Speed V_o2,⊥: | -- |
| Target Cross-Velocity V_t,⊥: | -- |
| TMA Observability Condition: | -- |
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