National Taiwan University
South China Sea PALACE Float
The data are recovered from the floats via the Argos system. This float spends
approximately 6 hours transmitting on the surface with one message
transmitted each 42 seconds. This means that this float transmits about 514
messages for each profile. The statistics below reveal that only about 2%
of transmitted messages are received by the satellite.
- Float Id: A unique 3 digit identifier assigned to each
float.
- Number of Profiles: The number of profiles the float has
executed so far.
- Incomplete Profiles: The number of profiles that have an
incomplete Argos message set. This condition results in a missing
segment of data in the profile plots. The accompanying percentage gives
the ratio of the Incomplete Profiles to the Number of
Profiles.
- Satellite Passes: The average number of times that a
satellite passed overhead while the float was on the surface.
- Messages Expected: This is the average number of messages
that should have been received when satellites were overhead. If two or
more satellites are overhead simultaneously then each transmission was
multiply-counted. The number of messages expected for a given satellite
pass is determined from the Argos data stream by counting the number of
messages received and adding the number of messages
missing. Due to averaging and rounding effects, these entries in the
table below may not add up exactly.
- Messages Received: This is the average number of messages
that were actually received by satellites (without regard to the CRC
check). The accompanying percentage gives the average ratio of the
messages received to the messages expected.
- Messages Missing: This is the average number of messages
that were transmitted while a given satellite was overhead but that were
not received by the satellite. These are detected in the Argos data
stream by gaps in time and message number. The accompanying percentage
gives the average ratio of the messages missing to the messages
expected.
- Good Messages: This is the average number of messages
received that passed the CRC check. The accompanying percentage gives
the average ratio of the good messages to the messages
received.
- Bad Messages: This is the average number of messages
received that failed the CRC check. The accompanying percentage gives
the average ratio of the bad messages to the messages
received.
- Telemetric Efficiency: This measures the average rate of
successful transmission when satellites are overhead. It is the average
ratio of the number of good messages to the number of messages
expected.
University of Washington Profiling Drifter ARGOS Receipt Statistics
| As of 10:30 GMT on Nov 05, 2009 |
|
Average Per-Profile Statistics for ARGOS Data Telemetry |
Float
Id |
Profiles
Executed |
Incomplete
Profiles |
|
Satellite
Passes |
|
Telemetric
Efficiency |
|
Messages
Expected |
|
Messages
Received |
|
Messages
Missing |
|
Good
Messages |
|
Bad
Messages |
| 1007 |
189 |
40 |
21.2% |
|
8 |
|
55% |
|
93 |
|
68 |
74% |
|
25 |
26% |
|
50 |
73% |
|
18 |
27% |
|
|
|
|
| Ensemble Average: |
21.2% |
|
8 |
|
55% |
|
93 |
|
68 |
74% |
|
25 |
26% |
|
50 |
73% |
|
18 |
27% |
| Standard Deviation: |
0.0% |
|
2 |
|
15% |
|
24 |
|
18 |
11% |
|
17 |
11% |
|
17 |
11% |
|
7 |
11% |