“Target Motion Analysis”的意思、由来-开放百科全书

Target Motion Analysis (TMA) is a process to determine the position of a target using passive sensor information. Sensors like passive RADAR and SONAR provide directional and occasionally frequency information. TMA is done by marking from which direction the sound comes at different times, and comparing the motion with that of the operator's own ship. Changes in relative motion are analyzed using standard geometrical techniques along with some assumptions about limiting cases. There are two different ways to execute TMA: manual and automated.

Manual TMA

Manual TMA methods involve computation executed by humans instead of computers. There exist several manual TMA methods such as: Ekelund Ranging, 1934 Rule, Spears Wheel etc.

Ekelund ranging

It is a method that is specifically designed for a 2leg-1zig scenario. This method works by first estimating the bearing rates during the first

and second leg

. Secondly, one calculates the speed of advance along the line of sight with the target on the first

and second leg

. The rule then states that the range of the target at the moment of maneuver^[2] is given by:

To check the solution of an Ekelund Ranging solution there is also an iPhone app available.^[3]

Automated TMA

Automated TMA methods involve computations executed by computers. This allows for the simultaneous tracking of multiple targets. There exist several automated TMA methods such as: Maximum Likelihood Estimator (MLE), etc.

Maximum Likelihood Estimator (MLE)

The MLE method tries to fit the directional measurements (bearings) to a theoretical linear motion model of the target. The bearing function to be fitted is:

measerements of

have been collected, the problem reduces to an overdetermined system of

non-linear equations. The state vector associated is

References

1. ^D.H. Wagner, W.C. Mylander and T.J. Sanders (1999). Naval Operations Analysis, United States of America: Naval Institute Press,. {{ISBN|9781591149507}}.
2. ^spelling correction source dictionary
3. ^SlimeSoft [https://itunes.apple.com/us/app/ekelund-range/id305672427?mt=8 "Ekelund Range"]. Retrieved on 15 December 2014.