permit to 
racy and 
introduce 
[he OTF 
integer 
  
  
87000 88000 
to the 
scientific 
erformed 
rnational 
ms test, 
rvey was 
and for 
surface 
stance of 
' Station 
pose of 
plateau 
foreseen 
Traverse 
solution 
change 
C area. 
ted the 
solutions 
The first 
one located close to the vehicle while the 
second one located 200 km far away . 
Different DGPS elaboration are presented and it 
is possible to observe the effect of ionospheric 
cycle slips. 
4.00 - 
200 
0.00 - 
Coordinate differences (m) 
-2.00 -; 
-4 00 + ; ue ; Pr vuU 
337200 337600 338000 338400 338800 339200 
GPS Time (m) 
Fig.3 - Rover antenna coordinate differences 
obtained through DGPS solution from two 
reference stations located at 5 and 200 km . 
4.00 -, 
£ | ; 
® 200 | \ 5 / 
c | | x / 
Id A 
D | \ ^ 
Π\ 
© | 3 j 
D A : we 
8 RAO: UE MI 
= | N J - e) = 
9 0.00 ! ANort NT ld 
8 A en 
nt , 
Ö i , 
-2 .00 wg ! T 133 EF 7T 7 Du TO WE T 3 
337200 337600 338000 338400 338800 339200 
GPS Time (s) 
Fig.4 - Rover antenna coordinate differences 
obtained through Code Smoothed solution from 
two reference stations located at 5 and 200 km . 
  
  
  
  
0.40 
E 020. I Pat « 
— i » , , -» Ne 
EE Wel LA] 
C » AR Fx ” 3. \ 
© | ete | x : de 
SE 500-1 East“ of FRAN Ps ris 
0 5 | ^. D 
© i Je =e 
© : 
8 | A 
o A North 
3 0% ; mn 
JAH. 
1 NO ne let, 
-0.40 A ui 7 1 T | T I T ] 
337200 337600 338000 338400 338800 339200 
GPS Time (s) 
Fig.5 - Rover antenna coordinate differences 
obtained through kinematic solution from two 
reference stations located at 5 and 200 km . 
4. Hells Gate Ice Shelf grounding line 
determination 
Fast static GPS measurements were made to 
study the effect of tidal undulation on the Hells 
Gate Ice Shelf platform and to locate the 
presence of eventual grounding zones 
(Bondesan A., 1994). 
The results of GPS measurements showed that 
the vertical movement curves of the platform 
are show a similar pattern with the sea tidal 
curves provided by the tide-gauge recordings 
according. 
Limited number of stations allows to cover a 
small investigated area for grounding line 
detection, so a continuous kinematic GPS 
survey was designed with the aim to cover a 
wide range area. 
The first operation was the continuous survey of 
40 hours on some points to build a tidal 
response curve of the ice shelf floating platform 
(Fig. 6). 
After an accurate determination of the time 
relative to the maximum and minimum 
amplitude, kinematic profiles (long till to 30 
km) were made in maximum and minimum sea 
tidal amplitude. The GPS antennas were located 
on two skidoos (fig.7), while the two reference 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996