82310_UM_ SVDR_E 11
ground station. The ground station or LUT has a 2500 km satellite
reception radius centered at the LUT. In areas without LUT
coverage (mostly less populated areas in the southern hemisphere),
signals from the 121.5MHz transmitter will not be detected by the
satellites, only by passing aircraft’s. From the year 2006,no new
satellites will be launched including 121.5MHz receiver, and from
the year 2009,satellitedetection of the 121.5MHz EPIRB is
terminated. This is not the case with the 406MHz transmitter,
because the satellites have a memory unit, which stores the signals
for relay to the next available LUT giving it a truly global
coverage. Once the signal is received by the LUT, it is processed
for location and sent to a Mission Control Center (MCC).The MCC
sorts the alert data according to geographic search and rescue
regions and distributes the information to the appropriate Rescue
Co-ordination Center (RCC), or if outside the national search and
rescue area, to the appropriate MCC that covers the area that the
distress signal was detected. The RCC in turn takes the necessary
action to initiate search and rescue activities.
1.1.3 Distress location determination
The location of the distress signal is determined by taking
measurements of the doppler shift of the EPIRB frequency when
the satellite first approach and then pass the EPIRB. The actual
frequency is heard at the time of closest approach (TCA). Knowing
the position of the satellite and using the received doppler signal
information, it is possible to determine the location of the Capsule
from the satellite at the TCA. At the LUT, actually two positions
are calculated. One is the actual position (A) and the other is the
mirror image (B) position [FIG.1.1.3]. A second satellite pass
confirms the correct location (A).With the 406MHzsystem the real
solution can be determined on the first pass with a reliability of
nearly 90% and down to an accuracy of less than 5 km (3.1 miles).
Содержание Tron S-VDR CAPSULE
Страница 1: ...www jotron com Tron S VDR CAPSULE USERS MANUAL...
Страница 12: ...12 82310_UM_ SVDR_E Figure 1 1 3 COSPAS SARSAT Signal detection system...
Страница 29: ...82310_UM_ SVDR_E 29 Figure 4 5 a Junction box with lid removed...
Страница 30: ...30 82310_UM_ SVDR_E Figure 4 5 b Junction box with measures...
Страница 42: ...42 82310_UM_ SVDR_E 7 NOTES...
Страница 44: ...Jotron AS P O Box 54 NO 3280 Tjodalyng Norway Tel 47 33 13 97 00 Fax 47 33 12 67 80 www jotron com...
