MIL-I-81987(AS)
Display Type, Range, and
No. of
Resolution (See Note 3)
Bits
Conversion
Information
Discrete, 0 -1 binary
1
None
Target ID
3
None
Discretes
Numeric, 0-7, 1
1
Discrete, 0-1 Binary
None
Discretes Parity
1
Discrete, 01 binary
None
Target Report
1
Discrete, 0-1 binary
None
Not TWS
1
Pointer
Discrete, 0-1 binary
None
2
N u m e r i c , 0-3,1
None
Raid Size
Reply Message R3B
16
Numeric/Discrete (See Note 2),
Mod .2's Comp.
A/C Latitude
Binary to BCD
59.9' to
00.0', .1'
(See Note 1)
17
Numeric/Discrete (See Note 2),
A/C Longitude
Mod .2's Comp.
59.9' to
00.0',
Binary to BCD
.1'
(See Note 1)
Reply Message R3C
Mod .2's Comp. Numeric, -4096 to +4080 knots,
Target X Velocity
16 knots
Binary to BCD
(See Note 1)
Mod .2's Comp. Numeric, -4096 to +4080 knots,
Target Y Velocity
16 knots
Binary to BCD
(See Note 1)
Note 1- Modified 2's complement binary is defined as sign bit = 1 - straight binary and
sign bit = 0-2's complement.
Note 2 - N, S, E, and Y may be indicated by a discrete indicator.
Note 3 -The following are acceptable conversion tolerances:
A/C Heading
1 deg
1000 ft or + 100 ft as applicable
A/C Altitude
1 knot
A/C Airspeed
100 lb
Fuel Status
1 deg
TACAN Bearing
TACA N Range
N.M.
TGT X Pos.
N.M.
TGT Y peso
M.
TGT Altitude
0.2 min
Latitude
0.2 min
Longitude
knot
TGT X Vel
1 knot
TGT Y Vel
-15-
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