 |
|||
|
|
|||
| ||||||||||
|
|  MIL-D-70789A (AR)
3.5.10 British National grid. During initialization, if an
ACCEPT POSITION command is receivd in which the least
significant 4 bits of D8 designate spheroid No. 0 (Airy), the DRU
shall output coordinates and grid azimuths in the British
National Grid as described in the Ordnance Survey Information
Leaflet, No. 72. The DRU shall also output pertinent messages in
the British National Grid if it was doing so prior to the last
shutdown and no ACCEPT POSITION command has been received that
changed the spheroid. During initiation of, and while operating
in the British National Grid, the DRU shall ignore characters D6
and D7 of the ACCEPT POSITION command during updates. Characters
D22 of the NAVIGATION DATA message and D2 of the POSITION DATA
message shall indicate a plus for the hemisphere and a zero for
zone.
If the Configuration Definition Flag for Azimuth (3.5.8.8g) is
reset, pointing device grid azimuths, vehicle grid azimuths, and
travel lock grid azimuth references in messages shall be in terms.
of the British National Grid. If the Configuration Definition
Flag for Azimuth is set, all azimuths in messages shall be
geodetic.
3.5.11 Normal Zone. If the DRU is operating in the
Universal Transverse Medicator Grid, then, at anytime during a
mission when character D6 of the last received ACCEPT POSITION
command is A 61 or when the DRU crosses an extended zone
boundary, the DRU shall output UTM coordinates and grid azimuths
in the normal zone. That is, in terms of standard (normal)
hemisphere and zone for the geographic position where it is
located. Normal zone boundaries shall be in accordance with TM
5-241-8, Universal Transverse Mercator Grid. When the DRU
crosses the equator or zone boundary, the DRU shall automatically
reference the coordinates to the changed hemisphere/zone and set
bit 3 of ALERT DATA character D6.
If the Configuration Definition Flag for Azimuth (3.5.8.8g) is
reset, pointing device grid azimuths, vehicle grid azimuths, and
travel lock grid azimuth references in messages shall be in terms
of the hemisphere and zone in which the DRU is located. If the
Configuration Definition Flag for Azimuth is set, all azimuths in
messages shall be geodetic.
3.5.12 Extended zone. If the DRU is operating in the
Universal Transverse Mercator Grid, then, at anytime during a
mission when character D6 of the last received ACCEPT POSITION
command designates a hemisphere and zone, the DRU shall output
UTM coordinates and grid azimuths in terms of the extended zone
and the spheroid designation stored/input during initialization.
52
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals