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|
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i
REVIEW
In aerial survey, navigation methods and equipment can be used
for at least three different purposes:
1. General air navigation,
IN being the technique of guiding the
| aeroplane to the starting point of the
survey line or survey block,and return
to the airport
d Innovations and improvements in the field of general air navigation
are: )
use of improved VLF navigation
2)
use of improved Doppler navigation
| anh ed) QA
use of improved INS navigation
2. Survey navigation,
being the technique of producing the correct coverage,
which can be & pattern of parallel lines or any other
pattern.
Methods applied in survey navigation are
(24) visual and/or DR 4) navigation methods
(2b) instrumental navigation methods — either ground-based
or selfcontained. :
(2a) Innovations and improvements in the field of visual navigation
or "contact navigation" are: use of ERTS/Landsat imagery for
small and medium scale navigation. | e»
Innovations and improvements in the field of D.R. navigation
are: use of programmable pocket calculators N I One!
(2b) Innovations and improvements in the field of instrumental
d lii navigation are: use of doppler-plus-compass navigators and of
| inertial navigators equipped with dedicated digital computers
e numerical displays) the programs of which are designed
rvey_navigation.
I 1)
I Doppler/compass/digital computer, precision self-contained
| automated navigation equipment
Very low frequency ground-based air navigation equipment
Inertial navigation instrumentation, equipped with specialized
navigation computer
I 3)
4)
Deduced reckoning