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Revision as of 15:05, 5 October 2014
Format
twodc - 2-DC data structure with format
twodc = REPLICATE({ $ ; Byte Description
FRONT:161UL, $ ; 00-03 CONSTANT Y'10100001'
IMAGE:BYTARR(4096), $ ; 04-4099 2-D Image Slices
STTIME:0UL, $ ; 4100-4103 Image Start (Seconds from midnight*10000)
NDTIME:0UL, $ ; 4104-4107 Image End (Seconds from midnight*10000)
STTAS:0U, $ ; 4108-4109 Image Start TAS *100
NDTAS:0U, $ ; 4110-4111 Image End TAS *100
SPARE:0UL, $ ; 4112-4115 Space
DATE:0UL, $ ; 4116-4119 Date (MMDDYY)
Spare1:0UL, $ ; 4120-4123 Total Air Temperature Multiplied by 100 in Kelvin
Spare2:0UL}, $ ; 4124-4127 Spare
4) ; 4 element Array
Conversion from Total Air Temperature (TAT) to Static Air Temperature (SAT)
The difference between TAT and SAT is called ram rise (RR) and is caused by compressibility and friction of the air at high velocities.
<math>RRtotal=TAT-SAT</math>
where
<math>RRtotal=V^2/87^2</math>
V is the air speed in knot