-30-
exposure stations) to 15 feet. The same data are used as listed under
the controlled photo unit. The orientation of the individual frames as
they influence a far off-axis landmark are utilized as a group, differing
from the individual positioning of the frames for the photo mapping
mission. Under flight conditions which provide reasonable geometric
strength to the SHIRAN measurements, it is expected that control point
surveying error will be down within the range of the resolution of the
system with respect to the location of the SHIRAN ground stations.
f. Aerial Geodetic Surveying.
The function of the respective mission is to precisely
determine the distance between pairs of ground stations. These dis
tances are combined to establish a trilateration network which provides
the accurate geodetic location of each station. This program unit re
quires data from two SHIRAN stations, index of refraction data, and
altitude. In addition, simultaneous data from three or four SHIRAN
stations can be utilized if the stations are all within range of the air
craft. Such three and four station measurements significantly reduce
the time required to adjust an entire net.
g. Aerial Geodetic Azimuth Determination.
The long line azimuth determination is made by either of
two methods. Consequently, two computer program units are required
One method uses long focal length ballistic cameras; the other uses a
theodolite. The only input data required by either solution are the
photographic records and the reduced data from these records. This
program does not use the magnetic tape input ;of the airborne recorder.
So much for the detailed technical description of the AN/USQ-28 Map
ping Survey System, its functions, its components, and its operation.
A complete flight test of the system is scheduled for July 1965.
Improvements resulting from these tests will then be incorporated into
all systems.