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NavyUSA · 03-22-14, 10:49 AM

Hi commanders,
With the below image, i show you one of a few tables for prediction range during first phase of tma.

This posted image is usable only if relative bearing of target is 75<=B<=85, and ownship and target are along lag los.
For obtain prediction range must be calculated bearing rate after 2 min from first relative bearing B.
Example: if bearing rate is 1.7, you have the 68.23% probability that target is on interval [5.5 , 6.5] nm. But the probability that target is on interval [6 , 8] nm is 95.4% (Gaussian).
This is a great information (statistic) and no a magic solution.
For calculate bearing rate with good accuracy i have find simple method in a manual of tma from betasom forum, in italian language. I haven't had problem understand with google translate.
Last point important, this tables must be used with ownship speed between 6,7 knots, and when target speed is between 5,7 knots. In all other situations the error of prediction will increase.

03-22-14, 10:49 AM	#1
NavyUSA Watch Join Date: Oct 2011 Location: Los Angeles Posts: 21 Downloads: 14 Uploads: 0	Range prediction, fast fire solution. Hi commanders, With the below image, i show you one of a few tables for prediction range during first phase of tma. This posted image is usable only if relative bearing of target is 75<=B<=85, and ownship and target are along lag los. For obtain prediction range must be calculated bearing rate after 2 min from first relative bearing B. Example: if bearing rate is 1.7, you have the 68.23% probability that target is on interval [5.5 , 6.5] nm. But the probability that target is on interval [6 , 8] nm is 95.4% (Gaussian). This is a great information (statistic) and no a magic solution. For calculate bearing rate with good accuracy i have find simple method in a manual of tma from betasom forum, in italian language. I haven't had problem understand with google translate. Last point important, this tables must be used with ownship speed between 6,7 knots, and when target speed is between 5,7 knots. In all other situations the error of prediction will increase.