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GZ-RW
z-axis, continuous: z gyro random walk
C
S
0
0
1
∆𝐷 𝑖 𝑐
ℎ 𝑖 = √ ℎ 𝑖−1 2
+
.
𝐼 𝑖−1 +𝐼 𝑖 2
𝑠𝑖𝑛 (
)
The following terms are common to both the gyro and MWD models. Error Code Description Survey Mode
Propagation Mode
Weighting Function
MD
Inc w 12
Azimuth
40 41 42 43 44 45 46 47 48
XYM1 XYM2 XYM3 XYM4 VSAG DRF-R DRF-S DSF-W DST-G
xy misalignment 1 xy misalignment 2 xy misalignment 3 xy misalignment 4
C/S C/S C/S C/S C/S C/S C/S C/S C/S
S S S S S R S
0 0 0 0 0 1
0
0
- w 12 /sinI
w 34 cosA w 34 sinA
- w 34 sinA/sinI w 34 cosA/sinI
Vertical sag (SAG in MWD model)
sinI
0 0 0 0 0
Depth random error
0 0 0 0
Depth systematic reference
-
Depth scale
S/W
ΔD
Depth stretch type
G
(D v +DcosI). ΔD
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