TM 5-6675-318-14
4 - 6 . 3 . 3 O f f - L i n e M o d e .
This mode enables the operator to determine two
dimensional, 3D position, and translocated positions of survey sites, using data
recorded on tape cassettes.
The positions are computed by the satellite surveyor
using keyboard entered data and satellite pass data read from the tape. The off
line mode may use one or more l-site or 2-site tapes. The tapes recorded in the
standard or control mode are called l-site tapes.
Tapes recorded in the remote mode
a r e c a l l e d 2 - s i t e t a p e s.
The 2-site tapes contain both control site data and remote
s i t e d a t a .
I f t h e s a t e l l i t e s u r v e y o r i s t o o p e r a t e i n o f f - l i n e m o d e o n l y , t he
antenna need not be assembled or connected to the receiver/processor. The func-
tional diagram shows the off-line mode of operation.
The 3D positioning computation
will provide location data of the survey site with an accuracy within 10 m (32.8 ft)
rms.
Assemble and prepare the equipment for use (paragraph 4-6.1 and 4-6.2) and
operate the receiver/processor in the off-line mode as-follows:
a.
Three D positioning with 1- or 2-site tapes.
The following procedure is used
t o d e t e r m i n e t h e s u r v e y s i t e 3 D p o s i t i o n i n g u s i n g e i t h e r 1 - o r 2 - s i t e t a p e s . I f a
2-site tape is used, the computation ignores control site data. The accuracy of
the 3D position computation depends on the number of acceptable satellite passes
c o l l e c t e d ( T a b l e 4 - 4 ).
(1) Select the off-line mode of operation by entering code 10.
(2) Position the tape to the beginning of tape (BOT), by entering code 41.
NOTE
If 3D position estimate must be extracted from the tape, proceed to step
( 3 ) . I f d a t a i s a v a i l a b l e f r o m p r e v i o u s l y r e c o r d e d t a p e , p r o c e e d t o s t e p ( 4 ).
( 3 ) E x t r a c t 3 D p o s i t i o n e s t i m a t e a s f o l l o w s:
(a) Enter code 42 to have tape search for end of data. End of data is
located when CODE is displayed.
4-80
