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Recap of
Paul Ternlund's DF analysis
EOSS#61 Tracking and Recovery Team Results using the WB3JZV Triangulation Program � 16 November 2002
- The Tracking and Recovery Group comprised 9 DF teams
- There were 8 payload fixes computed between 9:10 and 10:47AM (LOS).
- The lowest Average Tracker Error of 4 degrees was a tie between WB4ETT and KI0DZ.
- In general, average tracker bearing errors were 10 degrees
- Separations in miles between GPS and the T&R group fixes ranged from a worst case of 54 miles (1st sample) to 6 miles (3rd sample time). The 8th or final / LOS�most important sample error was unavailable due to an EOSS#61 payload problem. The landing site and the T&R LOS fix separation was 9 miles.
- The GPS and T&R group error is commonly large during the initial sample times when the beacon is far down range (in this case 60 miles west) and the T&R group has a small (in this case only a 15 mile north-south) dispersion. This is because the lines of bearing cross at acute angles and small bearing errors can result in large fix displacements.
- An LOS error of 9 miles relates to an 81 square mile uncertainty. The latter is within the program�s goal of a 100 square mile search area.
EOSS#62 Tracking and Recovery Team Results using the WB3JZV Triangulation Program � 16 November 2002
- The Tracking and Recovery Group comprised 9 DF teams
- There were 7 payload fixes computed between 9:50 and 11:39AM (LOS).
- The lowest Average Tracker Error of 8 degrees was a tie between KB0UBZ, WB4ETT and KI0DZ.
- In general, average tracker bearing errors were 12 degrees
- Separations in miles between GPS and the T&R group fixes ranged from a worst case of 47 miles (1st sample) to 0.5 miles (5th sample time). The 7th or final / LOS�most important sample error and the landing site was 2.4 miles.
- The GPS and T&R group error is commonly large during the initial sample times when the beacon is far down range (in this case 60 miles west) and the T&R group has a small (in this case only a 15 mile north-south) dispersion. This is because the lines of bearing cross at acute angles and small bearing errors can result in large fix displacements.
- An LOS error of 2.4 miles relates to an 5.8 square-mile uncertainty. The latter is well within the program�s goal of a 100 square mile search area.
FYI, The Triangulation Program is designed to provide a good fix when most (more than half) of the LOBs are �good� for a given sample time. The goal is to obtain our final fix to within 100 square miles of shuttle touchdown (that is within about a 10 mile by 10 mile area). Mobile tracking units can patrol this area while listening for a beacon.
The following is true�
1.Single-digit bearing errors are better than double-digit
2.When a station has multiple double-digit bearing errors, it is likely the station is having equipment and /or technique problems.
3.Every station will encounter LOB errors some time for many reasons.
4.The greater the participation (i.e., the more LOBs submitted) for a sample time, the better the chance of a good fix resulting from the program.
5.Once in the field, prior to a launch, a DF team may request an LOB test to my station to practice/validate a DF process.
73, de Paul Ternlund, WB3JZV