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Automatic Briqhtness Control (ABC) |
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|  MIL-S-70442 (AR)
3.4.2.4.9.4 Automatic Briqhtness Control (ABC). A light sensor
and control system which automatically adjusts the brightness of the
HUD and symbology in response to the outside ambient light level
A switch on the HUD front panel
shall be incorporated in the HUD.
permits the pilot to enable or defeat the automatic control. The
ABC shall operate within the brightness range of the symbols and for
an ambient range of 100 to 6000 foot-lamberts.
3.4.2.5 Accuracy. Within the environmental conditions
specified herein, the HUDS shall meet the following accuracies:
Fire control reticle positioning accuracies. Angular
deviation in azimuth and elevation between the angular position of
the center of the fire control reticle and the FCC commanded angular
position shall not exceed 2 milliradians (mr), one sigma, in each
axis. This shall apply within the angular limits shown in Figure
3. When the angular position of the fire control reticle is derived
by the HUDS as a function of input laser range, the angular
deviation in azimuth and elevation between the angular position of
the center of the fire control reticle and the theoretical angular
position (zero degree azimuth, ideal range-derived-elevation) shall
not exceed + 0.7 mr, one sigma, in azimuth and + 2.7 mr, one Sigma,
in elevation. This shall apply within the elevation angular limits
shown in Figure 3. All angular positions are with respect to the
ADL .
Gunner's TSU LOS cueinq reticle positioning accuracy. When
b.
not in TOW mode, the angular deviation in azimuth and elevation
between the angular position of the center of the LOS cueing reticle
and the TOW sight commanded angular position shall not exceed + 4
mr, one sigma, in each axis. This shall apply within the angular
limits shown in Figure 3. When in TOW prelaunch mode, the angular
deviation shall be + 3 mr, one sigma, in each axis. This shall
apply within the angular limits shown in Figure II. When in TOW
post launch mode, the angular deviation between the modified angular
position (actual elevation and azimuth angles multiplied by 22.85)
of center of the LOS cueing reticle and the TOW sight commanded
angular position shall not exceed 4 degrees, one sigma, in each
axis. This shall apply within the angular limits shown in Figure
12. All angular positions are with respect to the ADL.
c. TOW rectangular s ymbol accuracies. The azimuth angular
width and elevation angular height for the TOW prelaunch rectangle
symbol shall be as shown in Figure 9. The TOW postlaunch rectangle
I
symbol shall be as shown in Figure 9.
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