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Paul Ternlund's DF report
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Results from the Triangulation Program - 22 June 2002
- The Tracking and Recovery Group comprised 5 DF teams
- There were 11 sample times executed between 08:45 and 10:16AM
- The best overall team performance came from KC0CNT with a 5 degree average
LOB error
- In general, average tracker bearing errors were high (13 degrees).
However, after receiving my reports on poor performance, two stations
relocated away from a fence and or power lines and by the 6th sample, average
tracker bearing errors were reduced to only 5 degrees!
- Separations in miles between GPS and the T&R group fixes ranged from 9
miles (2nd sample) to 0.2 miles (11th or final / LOS-most important sample)
- An LOS error of 0.2 miles relates to an .04 square mile of uncertainty.
The latter is well within the program's goal of a 100 square mile search area.
This was the best team result I can recall!
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…
- Single-digit bearing errors are better than double-digit
- When a station has multiple double-digit bearing errors, it is likely the
station is having equipment and /or technique problems.
- Every station will encounter LOB errors some time for many reasons.
- 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.
- 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, WB3JZV
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